Skip to main content
Frontiers in Pharmacology logoLink to Frontiers in Pharmacology
. 2021 Mar 30;12:578796. doi: 10.3389/fphar.2021.578796

Risk Compounds, Preclinical Toxicity Evaluation, and Potential Mechanisms of Chinese Materia Medica–Induced Cardiotoxicity

Jie Zhou 1,2,3,, Fu Peng 4,†,, Xiaoyu Cao 1,2, Xiaofang Xie 1,2, Dayi Chen 2,, Lian Yang 2, Chaolong Rao 2, Cheng Peng 1,2,*, Xiaoqi Pan 1,2,*
PMCID: PMC8044783  PMID: 33867974

Abstract

Chinese materia medica (CMM) has been applied for the prevention and treatment of diseases for thousands of years. However, arrhythmia, myocardial ischemia, heart failure, and other cardiac adverse reactions during CMM application were gradually reported. CMM-induced cardiotoxicity has aroused widespread attention. Our review aimed to summarize the risk compounds, preclinical toxicity evaluation, and potential mechanisms of CMM-induced cardiotoxicity. All relevant articles published on the PubMed, Embase, and China National Knowledge Infrastructure (CNKI) databases for the latest twenty years were searched and manually extracted. The risk substances of CMM-induced cardiotoxicity are relatively complex. A single CMM usually contains various risk compounds, and the same risk substance may exist in various CMM. The active and risk substances in CMM may be transformed into each other under different conditions, such as drug dosage, medication methods, and body status. Generally, the risk compounds of CMM-induced cardiotoxicity can be classified into alkaloids, terpenoids, steroids, heavy metals, organic acids, toxic proteins, and peptides. Traditional evaluation methods of chemical drug-induced cardiotoxicity primarily include cardiac function monitoring, endomyocardial biopsy, myocardial zymogram, and biomarker determination. In the preclinical stage, CMM-induced cardiotoxicity should be systematically evaluated at the overall, tissue, cellular, and molecular levels, including cardiac function, histopathology, cytology, myocardial zymogram, and biomarkers. Thanks to the development of systematic biology, the higher specificity and sensitivity of biomarkers, such as genes, proteins, and metabolic small molecules, are gradually applied for evaluating CMM-induced cardiotoxicity. Previous studies on the mechanisms of CMM-induced cardiotoxicity focused on a single drug, monomer or components of CMM. The interaction among ion homeostasis (sodium, potassium, and calcium ions), oxidative damage, mitochondrial injury, apoptosis and autophagy, and metabolic disturbance is involved in CMM-induced cardiotoxicity. Clarification on the risk compounds, preclinical toxicity evaluation, and potential mechanisms of CMM-induced cardiotoxicity must be beneficial to guide new CMM development and post-marketed CMM reevaluation.

Keywords: Chinese materia medica, cardiotoxicity, risk compounds, preclinical toxicity evaluation, potential mechanisms

Introduction

Chinese materia medica (CMM) as an alternative therapy for disease treatment has become increasingly popular all over the world. A large number of clinical evidence has valued CMM, which is based on shifting compensatory homeostasis to the overall human body homeostasis, complementary to chemical medicine in the management of chronic disease (Fan et al., 2011). However, CMM formulations are often not subjected to premarket toxicity testing (Wang and Ren, 2002). Recently, more and more attention has been paid to the safety of CMM, including cardiotoxicity, hepatotoxicity, and nephrotoxicity of CMM. We previously reviewed some important information on CMM-induced liver injury (Pan et al., 2020). Drug-induced cardiotoxicity refers to the toxicity or negative effects of chemical drugs or CMM on the heart, including arrhythmia, myocardial ischemia, heart failure, and other cardiac adverse reactions (Li et al., 2015). A total of 81 drugs in the United States, Europe, and Asia from 1990 to 2013 were withdrawn from the market due to safety issues, including 16 drugs that caused arrhythmias (Li et al., 2016b). Chinese Adverse Drug Reaction Monitoring Report in 2018 showed that CMM accounted for 14.6% in adverse drug reactions/event reports and 8.7% in serious adverse reactions/event reports, and cardiovascular system damage caused by drugs accounted for 4.1% of all (National Medical Products Administration, 2019). General performances of drug-induced cardiotoxicity include electrocardiogram (ECG) abnormalities, myocardial infarction, impaired systolic and diastolic performance, functional remodeling and histopathological findings, and signs of apoptosis and degeneration. Acute cardiovascular injuries manifested as arterial hypertension, aortic dissection, arrhythmias, and myocardial ischemia. However, CMM-induced cardiotoxicity is easy to be ignored due to the lack of specific and detectable evaluation indicators.

At present, evaluation system on chemical drug-induced cardiotoxicity has been gradually established and improved, such as “The Clinical Evaluation of QT/QTc Interval Prolongation and Proarrhythmic Potential for Non-Antiarrhythmic Drugs” published by the International Conference on Harmonisation (ICH) in 2005, “Cardiovascular toxicity induced by chemotherapy, targeted agents and radiotherapy: ESMO Clinical Practice Guidelines” issued by the United States in 2012, and “Guidelines for Prevention and Treatment of Anthracycline-induced Cardiotoxicity” published by China in 2015 (Food and Drug Administration, 2005). However, the characteristics of multicomponent, multi-target, and multi-effect are involved in CMM-induced cardiotoxicity. There are not enough indicators of high specificity and accuracy to evaluate CMM-induced cardiotoxicity. Evaluation methods of cardiotoxicity caused by chemical drugs, such as anthracyclines, and chemotherapeutic and targeted drugs, are not fully applicable to those of CMM-induced cardiotoxicity. Therefore, evaluation strategies that meet the characteristics of CMM should be urgently established in the development and reevaluation of CMM. Previous studies mainly focused on chemical composition analysis, toxicity characteristics, mechanisms, and toxicokinetics on cardiotoxicity caused by single CMM or monomer compound of CMM. Our review aims to conclude these risk compounds, preclinical toxicity evaluation, and possible mechanisms of CMM-induced cardiotoxicity to guide clinical practice and promote the safety of drug application.

Literature Retrieval Methods

A target search of available literature was performed on the PubMed, Embase, and China National Knowledge Infrastructure (CNKI) from January 1, 2000 to February 29, 2020 with the following key search terms: (“Chinese materia medica,” OR “traditional Chinese medicine,” OR “Chinese herbal medicine,” OR “Chinese medicine,” OR “medicinal herb,” OR “Chinese medicinal herb,” OR “Chinese herbs,” OR “herbal medicines,” OR “herbs”) AND (“cardiotoxicity,” OR “cardiac toxicity,” OR “cardiac poisonous,” OR “cardiac adverse effects,” OR “cardiac side effects,” OR “cardiac adverse events,” OR “cardiovascular events,” OR “cardiac damage,” OR “cardiac risk”). Individual scientific principles were applied to ensure the quality and relevance of searched articles. Two authors independently screened titles and abstracts of articles, excluding articles not relevant to the topic. Those studies on Chinese herbal compound prescriptions were also excluded, and only the relevant studies on CMM, their extracts, and ingredients were retained. The required articles must include a description of CMM-induced cardiotoxicity with scientific data, including full-length experimental articles, reviews, English-only abstracts, case reports, and conference papers.

Risk Compounds of CMM-Induced Cardiotoxicity

The risk substances are the material basis for CMM-induced cardiotoxicity. Interestingly, the toxic material basis is closely related to the active material basis. Thus, misuse or overdose of CMM could trigger toxic effects instead of pharmacological action. According to different phytochemical structures, the risk compounds of CMM-induced cardiotoxicity are mainly classified into alkaloids, terpenoids, steroids, heavy metals, organic acids, and toxic proteins or peptides. Generally, more types of risk substances may be founded in a single CMM, while the same type of risk substance may exist in various CMM. Therefore, more attention should be paid to cardiotoxicity caused by CMM that contains these risk substances. The risk substances, toxicity evaluation indicators, and potential mechanisms of some common CMM-induced cardiac toxicity were concluded in Table 1.

TABLE 1.

Risk substances, toxicity evaluation, and potential mechanisms of some representative CMM-induced cardiotoxicity in vivo and in vitro.

Risk substances Toxicity evaluation Potential mechanisms References
Category Risk compounds CMM Models and dosage Measurement indicators
Alkaloids Aconitine Aconitum carmichaelii Debeaux. Primary culture of neonatal rat ventricular myocytes (NRVMs): 0–160 μmol/l for 7 days; AC-16 cells: 0–320 μmol/l for 24 h Cell viability, mito-SOX (AC-16 cells), Notch1, NICD, HES1, c-Myc, CK2α, KDM5A, p300, RBP-J, HCN 4, I f current, action potential, and beating rate Involvement of Notch1/NICD/KDM5A/HCN4 toxicity pathway Zhou et al. (2020)
Aconitum sp. Male Sprague–Dawley (SD) rats: 1.0 mg/kg/day by gavage for 7 days; H9c2 and rat primary cardiocyte cells: 0.5, 1, and 2 μmol/l for 24 h ROS, mitochondria damage, TNF-α, FADD, Fas/Fas-L, cytochrome C, Bcl-2, caspase-3, caspase-8, RIP1, RIP3, MLKL, NLRP3, ASC, caspase-1, IL-1β, LC3-II (mitochondria), BNIP3, ULK1, LC3, and p62 Mitigation of BNIP3-dependent mitophagy and activation of the TNF-α-NLRP3 inflammatory pathways Peng et al. (2020)
Aconitum carmichaelii Debeaux. Zebrafish embryo (cmlc2:eGFP): 1.87–30.0 μmol/l for 48 h; H9c2 cells: 0.75–6.0 mmol/l for 30 min Survival rate, HR, the contraction of ventricles and atria, cell viability, intracellular Ca2+ concentrations, gene expression profile, cacna1c, RYR2, ATP2a2b, cTnC, Myh6, cTnT, p38, caspase-3, Bcl-2, and Bax Ca2+ overload and cell apoptosis Li et al. (2020)
Hypaconitine Aconitum sp. Human embryonic kidney (HEK)-293 cells: 1, 3, 10, and 30 nmol/l; beagle dogs: 50, 150, and 450 μg/kg/day for 6 h QTc interval and KCNH2 currents Inhibition of KCNH2 potassium channels Xie et al. (2015)
Lappaconitine Aconitum sp. HEK-293 cells:10–100 μmol/l for 25–30 min hH1 channels Irreversible blockade of hH1 channels by binding to the site 2 receptor Wright, (2001)
Berberine Berberis sp. or Coptis sp. Guinea pigs: 27.1 mg/kg/day by gavage once; HEK-293 cells: 1 and 10 μmol/l for 24 h HSP90, mature-155 kDa hERG, immature-135 kDa hERG, ATF6, calnexin, calreticulin, the colocalization between hERG and calnexin/calreticulin, hERG current, APD, and QTc interval Induction of hERG channel deficiency by trafficking inhibition Zhang et al. (2014)
Evodiamine Evodia rutaecarpa (E. rutaecarpa) NRVMs: 31.3–250 μg/mL for 24 h; Zebrafish: 200–1,600 ng/mL for 24 h Cell viability, LDH release, MDA, HR, heart malformation, pericardial edema, circulation abnormalities, thrombosis and hemorrhage, and SV-BA distance Involvement of oxidative stress Yang et al. (2017)
Strychnine, brucine, and their N-oxide Strychnos nux-vomica L. (Loganiaceae) Male SD rats: 0.3 mg/kg and 0.6 mg/kg intravenously once; HEK 293 cells: 20–500 μmol/l for 10 min QT interval and hERG channels Inhibition of hERG channels Yuan et al. (2018)
Matrine, oxymatrine, cytisine, and sophocarpine Sophora tonkinensis Gapnep. (S. tonkinensis) hiPSC-CMs: 2, 10, and 50 μmol/l for 24 h Cell viability, LDH, CK-MB, cTnI, SOD, GSH, ROS, MDA, and intracellular calcium Induction of oxidative stress and disruption of calcium homeostasis Wang et al. (2019b)
Arecoline, guvacoline, and arecaidine Areca catechu L. Male Wistar rats: 4,500 mg/kg/day with arecae semen aqueous extract by gavage for 30 days Body weight, CK, arachidonic acid, PGE2, l-tryptophan, linoleic acid, α-linolenic acid, oleic acid, palmitic acid, palmitoleic acid, and stearic acid Disturbance of phospholipids, amino acids, and arachidonic acid metabolism Lin et al. (2020)
Terpenoids Triptolide Tripterygium wilfordii Hook. F. Male SD rats: 0.1 mg/kg by gavage for 14 days Heart/body ratio, HR, myocardial fiber breakage, cardiomyocyte hypertrophy, cell gaps, nuclear dissolution, LDH, CK-MB, CAT, GSH, GSH-PX, plasma cTnI and GzmB, myocardial AhR, plasma AhR, CYP1 A1, and microRNAs Changes in the expression of microRNAs and AhR Wang et al. (2019c)
Tripterygium wilfordii Hook. F. H9c2 cell and primary rat cardiomyocyte: 0–640 nmol/l or 160 nmol/l for 2–24 h.; p53−/− mice: 1.2 mg/kg intravenously once Glucose (culture medium), ATP, LDH leakage, cell morphology, p65 (nuclei and cytoplasm), IKKβ, IκBα, N-p65/Histone3 p65, GLUT1, GLUT4, glucose uptake, TIGAR, Pgam2, and Pdk2 p53 mediates cardiac injuries via dysregulation of glucose uptake by blocking the IKKβ-NF-κB pathway Xi, Zhang et al. (2020)
Celastrol Tripterygium wilfordii Hook. F. Male Wistar rats: 0.5, 1, and 2 mg/kg by gavage for 7 days Histopathological evaluation, MDA, SOD, valine, palmitic acid, sphingosine, lysophosphatidylcholine, 3-indolepropionic acid, 9-octadecenal, caspase-3, caspase-8, Bax, and Bcl-2 Palmitic acid–induced oxidative stress-regulated TNF/caspase axis Liu, Zhang et al. (2019)
Rhodojaponin I, II, and III Rhododendron molle G. Don (Ericaceae) Male SD rats: 21.44 and 112.56 mg/kg with Rhododendri Mollis Flos extract by gavage once HR, LVSP, LVDP, maximum rate of developed left ventricular pressure (dP/dtm), maximum rate of decreased left ventricular pressure (-dP/dtm), ST-segment, LDH, CK-MB, and AST Dong et al. (2014)
Steroids Oleandrin and other cardiac glycosides Nerium oleander L. Male guinea pigs: 150 and 300 mg/kg/day with hydroalcoholic extract of oleander by gavage once; ventricular myocytes: 0.3 and 10 mg/mL with hydroalcoholic extract of oleander ECG, mitochondrial structure, electron density, cardiac fiber, cardiac excitability, global Ca2+ transients, and Na+/K+-pump current Inhibition of Na+/K+- pump, mitochondrial damage, and disturbance of calcium homeostasis Botelho, Santos-Miranda et al. (2017)
Periplocin Periploca sepium Bge. Neonatal rat cardiomyocytes: 0.2 and 0.4 mmol/l for 24 h Tryptophan, carnitine, acetylcarnitine, citric acid, glutamic acid, pyroglutamic acid, leucine, pantothenic acid, indoleacrylic acid, proline, and lysophosphatidylcholine Disruption of amino acid metabolism, energy metabolism, and sphingolipid metabolism Li et al. (2016a)
Bufo steroids Bufo bufo gargarizans Cantor; Bufo melanostictus Schneider Male SD rats: 100, 200, and 400 mg/kg by gavage for 48 h HR, ST-segment, CK, CK-MB, ALT, AST, IL-6, IL-1β, TNF-α, MDA, SOD, CAT, GSH, GPX,TXNIP, NF-κB p65, IκBα, IKKα, IKKβ, ERK, JNK, and p38 Promotion of inflammatory response through the TXNIP/TRX/NF-κB and MAPK/NF-κB pathways Bi et al. (2016)
Bufalin Bufo bufo gargarizans Cantor; Bufo melanostictus Schneider Neonatal cardiac myocytes and adult rat cardiomyocytes: 40 and 400 ng/mL Chan Su extract, 4 and 20 ng/mL bufalin Calcium transients, intracellular calcium, and Na+-K+ ATPase Blockage of Na+- K+-ATPases and disturbance of calcium homeostasis Roger et al. (2002)
Others Arsenic trioxide Arsenolite HEK-293 cells and NRVMs: 3 μmol/l for 24 h I Ca,L, APD, hERG channel, and Cav-1 Involvement of Cav-1 expression and promotion of hERG degradation Yan et al. (2017)
Arsenolite Male BALB/c mice: 1 mg/kg/day via the tail vein for 2 weeks; ARVMs: 100 μmol/l for 20 min Cardiomyocyte contractile function, intracellular Ca2+ transients, SERCA activity, SERCA2a, NCX, PLB, CaMKII, GRP78, PERK, eIf2α, IRE1, ATF6, CHOP, and caspase-12 Disturbance of Ca2+ homeostasis and ER stress-associated apoptosis Zhang et al. (2017)
Arsenolite BALB/c mice: 1, 2, and 4 mg/kg/d via i.p. for 3, 7, and 14 days, H9c2 cell:0–10 µnol/l for 24 h Mitochondrial structure, mPTP opening, ROS, ATP content, PGC-1α, DRP1, MFN1, MFN2, and OPA1 Cardiac mitochondrial damage and impaired energy metabolism Zhang et al. (2018a)
Aristolochic acid Aristolochia sp.; Asarum L. Zebrafish embryos: 1, 5, 10, and 20 μmol/l for 2–48 h HR, cardiac phenotypes, COX-2, IL-1β, serum amyloid α, CCAAT/enhancer-binding protein B (C/EBPB), and C/EBPG Induction of inflammatory response Huang et al. (2007)
Calcium oxalate needle crystal and lectin protein Pinellia ternata (Thunb.) Breit. SD rats: 3 g/kg/day with Pinelliae Rhizoma and its processed products by gavage for 14 days Body weight, CK, CK-MB, LDH, histopathological evaluation, proline, leucine, tyrosine, saccharopine, 5-HT, dihydrouracil, KMTB, kynurenine, dhS1P, p-aminobenzoic acid, TGF-β1, mTOR, and MDA Induction of inflammatory response through inhibiting mTOR signaling and activating the TGF-β pathway Su et al. (2016)
Aag-FG50 (scorpion toxin) Androctonus australis hector Mongrel dogs: 0.05 mg/kg of the purified venom toxic fraction by intravenous injection once HR, mean arterial pressure, pulmonary artery occluded pressure, cardiac output, stroke volume, systemic vascular resistances, serum lactate, epinephrine, norepinephrine, neuropeptide Y, endothelin-1, and atrial natriuretic peptide Disturbance of hemodynamic by excessive catecholamines release Nouira et al. (2005)

Alkaloids

Diterpene Alkaloids

Alkaloids are the most common risk compounds in CMM-induced cardiotoxicity. Diterpenoid alkaloids are the largest category of alkaloids that lead to cardiac toxicity, which can be found in aconitum plants, such as Radix Aconiti lateralis Preparata, Radix Aconiti, Radix Aconiti Kusnezoffii, and Radix Aconiti Brachypodi, as well as their raw and processed products. According to different phytochemical structure, aconite alkaloids mainly include C-18, C-19, and C-20 types of diterpenoid alkaloids. C-19 diterpenoid alkaloids are the most common and most toxic ingredients, including aconitine, hypoaconitine, mesoaconitine, benzoyl aconitine, benzoyl hypoaconitine, and benzoyl mesoaconitine (Nyirimigabo et al., 2015). Aconitine and its analogs have been demonstrated to induce lethal malignant ventricular arrhythmias or acute myocardial infarction (Sun et al., 2014; Xie et al., 2015). Aconitine has even been developed into experimental tools to establish cardiac arrhythmic models in cardiovascular drug-related researches (Ma et al., 2018). In addition, other diterpenoid alkaloids, such as lappaconitine, ranaconitine, delvestidine, denudatine, secokaraconitine, and brachyaconitine, have also been shown to have obvious cardiotoxicity (Wang et al., 2014a; Nie et al., 2017).

Isoquinoline Alkaloids

Berberine, a class of isoquinoline alkaloids, is considered to be the major risk substance in various CMM, such as Coptis chinensis and Cortex Phellodendri Chinensis. It has been reported that berberine acutely inhibits human ether-a-go-go-related gene (hERG) currents and prolongs action potential duration in Xenopus oocytes (Li et al., 2001). Studies in vivo showed that high concentrations of alkaloids, including berberine, coptisine, palmatine, and jatrorrhizine, were found in heart tissues of mice. Results of in vitro experiments also suggested that berberine, coptisine, palmatine, and jatrorrhizine presented cytotoxicity in dose- and time-dependent manners in H9c2 cells (Ma et al., 2010). Some studies demonstrated that berberine, berbamine, palmatine, and oxyberberine could result in cardiac arrest and arrhythmia in a time- and dose-dependent manner (Zhang et al., 2018b). In addition to berberine and coptis alkaloids, Papaveraceae plant Chelidonium majus also contains other isoquinine alkaloids, such as sanguinarine, chelidonine, and chelerythrine. Direct effects of sanguinarine on the heart may be responsible for cardiac arrest and death (Hu et al., 2005). The concentration- and time-dependent apoptoses to necrosis were observed during chelerythrine administration in rat neonatal ventricular cardiomyocytes or human pluripotent stem cell–derived cardiomyocytes (Mioulane et al., 2012).

Indoles Alkaloids

Indoles alkaloids, such as strychnine and brucine isolated from Strychnos nux-vomica L., have been shown to be cardiotoxic. An automatic patch-clamp system was established to screen and evaluate strychnine for cardiotoxicity. Results showed that strychnine inhibited hERG, increased QT interval, and decreased heart rate (HR) in isolated rat hearts (Wang et al., 2018). Both strychnine and brucine were shown to exhibit the voltage-dependent inhibition of hERG channels (Yuan et al., 2018). Moreover, other indole alkaloids, such as evodiamine, vinblastine, and vincristine, are specified as the risk substances of Evodiae fructus and Catharanthus roseus, respectively. Results indicated that evodiamine led to cardiovascular side effects in primary cultured neonatal rat cardiomyocytes and zebrafish (Yang et al., 2017). Tubulin-binding drugs containing vinblastine and vincristine presented specific toxicity through pathologic, immunological, and transcriptomic analyses in cardiac endothelial cells (Mikaelian et al., 2010).

Organic Amine Alkaloids

Organic amine alkaloids, such as ephedrine and colchicines, have been gradually proved to be cardiotoxic. The study indicated that ephedrine isolated from Ephedra sinica Stapf could trigger a range of cardiovascular toxicities, including myocarditis, arrhythmias, myocardial infarction, cardiac arrest, heart failure, and sudden death (Samenuk et al., 2002; Adamson et al., 2004; Naik and Freudenberger, 2004; Nyska et al., 2005). Colchicine derived from Colchicum autumnale has been proved to impair impulse formation and conduction (Tochinai et al., 2014). Another study suggested that colchicine could directly damage cardiac endothelial cells to induce cardiotoxicity (Mikaelian et al., 2010).

Terpenoids

Terpenoids, such as triptolide, celastrol, and rhodojaponin, are other important compounds of CMM-induced cardiotoxicity. Triptolide, a highly promising diterpenoid triepoxide extracted from Tripterygium wilfordii, has been widely reported to elicit chest distress, cardiopalmus, bradyarrhythmia, and even cardiogenic shock (Huang et al., 2009). Some studies demonstrated that triptolide induced cardiomyocyte damage and cell apoptosis (Li et al., 2014; Zhou et al., 2015). Celastrol, a cell-permeable dienonephenolic triterpene compound, was also derived from Tripterygium wilfordii. Celastrol was revealed to have potent inhibitory activity on potassium channels, thereby inducing QT interval prolongation (Sun et al., 2006). Various toxic symptoms of zebrafish embryos were caused by celastrol, including appearance of heart linearization, heart membrane hemorrhage, and hemocyte accumulation in the cardiac region (Wang et al., 2009). Besides, grayanane diterpenoids, the main active component extracted from the fruits of Rhododendron molle, were related to cardiotoxicity (Zhou et al., 2014). A study on the toxicological effects of rhodojaponins demonstrated that myocardial injury was elicited by Rhododendron molle extract (Dong et al., 2014).

Steroids

Steroids, such as cardiac glycosides, cardenolides, and steroid saponins, are also revealed to induce cardiotoxicity. Cardiac glycosides are the largest category of steroids, such as digitalis derivatives, oleandrine, and periplocin. Digitalis derivatives have been known as a representative compound of cardiac glycosides. Several studies showed that digitalis derivatives presented arrhythmogenic effects on the heart (Demiryurek et al., 2002; Demiryürek and Demiryürek, 2005; Ramirez-Ortega et al., 2007). Arrhythmias and electrical conduction disturbances promoted by digitalis derivatives are related to cardiomyocyte dysfunction (Botelho et al., 2017). Oleandrin, a cardiac glycoside derived from the leaves of Nerium indicum, has been shown to induce myocardial damage in vivo and in vitro (Poindexter et al., 2007; Zhou et al., 2019). Periplocin, the main substance in Periploca sepium Bunge, easily triggered cardiotoxicity because of improper application (Demiryürek and Demiryürek, 2005). Moreover, cardenolide is another representative steroid compound of CMM. Bufadienolides, including resibufogenin, arenobufagin, bufalin, and cinobufagin, are natural cardenolides, which are also the major pharmacological constituents of cinobufagin venom toad. Induced resibufogenin delayed after depolarization and triggered arrhythmias in cardiac fiber at high concentrations in vitro and in vivo (Xie et al., 2002). Arenobufagin was also reported to induce obvious myocardial damage (Deng et al., 2017; Hou et al., 2018). Steroid saponins in some CMM have also been shown to be cardiotoxic. For example, ophiopogonin D, a steroidal saponin derived from Ophiopogon japonicus, presented toxic effects on cardiomyocytes (Ren et al., 2017; Wang et al., 2019a). Ginsenosides Rb1 and Re were found to inhibit cardiac contraction in ventricular myocytes (Scott et al., 2001).

Other Risk Compounds

Heavy metals, organic acids, toxic proteins, and peptides may also induce some cardiac adverse reactions. As2O3, the main ingredient of the highly toxic substance arsenic, has been proved to have a variety of adverse cardiac reactions, such as cardiac arrhythmia, ventricular tachycardia, or even sudden cardiac death (Barbey et al., 2003; Balakumar and Kaur, 2009; Zhang et al., 2013b). As2O3 was also shown to lead to human cardiac developmental toxicity (Bao et al., 2019). Aristolochic acid derived from Aristolochia debilis, Aristolochia manshuriensis, or Asarum sieboldii has been found to specifically trigger heart defects in zebrafish embryos (Huang et al., 2007; Shi et al., 2017). Toxic proteins and peptides mainly derived from some plants or animals have been widely reported to exert cardiac toxicity effects. Scorpion toxins, such as BmSKTx1, BmBKTx1, BmTX1, BmTX2, and BmP09 identified from buthotoxin, are the main substances that are responsible for cardiotoxicity (Xu et al., 2004a; Xu et al., 2004b; Yao et al., 2005; Quintero-Hernandez et al., 2013). Centipede toxin, a type of polypeptide toxin purified from Scolopendra subspinipes, including SSD609 and SsTx, can induce cardiovascular system disorders (Sun et al., 2015; Luo et al., 2018).

Preclinical Evaluation of CMM-Induced Cardiotoxicity

The early identification of CMM-induced cardiotoxicity is quite difficult due to the lack of specific evaluation methods. Evaluation of chemical drug-induced cardiotoxicity can provide a reference for CMM-induced cardiotoxicity. CMM-induced cardiotoxicity presents a variety of manifestations, including abnormal ECG, myocardial infarction, impaired systolic and diastolic performance, functional remodeling and histopathological changes, and signs of myocardial apoptosis and degeneration. Thus, CMM-induced cardiotoxicity should be evaluated at the overall, tissue, cellular, and molecular levels, including cardiac function, morphological alteration in cardiac muscle tissue, cell or organelle structures and function, myocardial zymogram, and biomarkers.

Cardiac Function

At present, various clinical examination methods can be used to evaluate the effects of CMM on cardiac function. Generally, the evaluation of cardiac function involves HR, blood pressure, hemodynamic parameters, ECG, echocardiography, and magnetic resonance imaging (MRI) examination. ECG, the most common technique for monitoring drug-induced cardiotoxicity, can record bioelectrical changes during the occurrence, spread, and recovery of cardiac excitability. Various arrhythmias, ventricular atrial hypertrophy, myocardial infarction, and myocardial ischemia can be identified by ECG monitoring. Electrophysiological alterations of drug-induced cardiotoxicity mainly involve the prolongation of QT/QTc interval, action potential duration (APD), and ST-segment alteration. QT and QTc interval can be prolonged 12–24 h after myocardial infarction. QT interval prolongation is also significantly associated with arrhythmia, especially ventricular arrhythmia and torsades de pointes (TdP) (Halkin et al., 2001). Similarly, the prolongation of APD-induced arrhythmia, following ventricular hypertrophy, can also lead to impaired myocardial relaxation and contractile function (Odening et al., 2013). The risk substances of cardiotoxicity caused by CMM, such as arsenic trioxide, berberine, hypaconitine, aconitine, and strychnine, usually induce the prolongation of APD and QT/QTc interval, thus causing various arrhythmias, abnormal cardiac systolic, and other adverse reactions (Wang et al., 2008; Chen et al., 2010; Zhang et al., 2014; Xie et al., 2015; Wang et al., 2018). Aconitine not only triggered sinus rhythm with low-amplitude P waves and junctional rhythm conducting with narrow QRS complex but also presented diffuse ST-segment depression and the prolongation of QT interval (Karturi et al., 2016). Aconitine and Venenum Bufonis disrupted heart rhythm, influenced diastolic function, and significantly promoted ST-segment elevation (Sun et al., 2014; Bi et al., 2016). Rhododendron molle extract–treated rats also showed an ST-segment elevation, following acute ischemic tissue injury (Dong et al., 2014). Intravenous injection with toad extract provoked supraventricular arrhythmia (Kostakis and Byard, 2009). Therefore, ECG is one of the effective indicators for identifying the selective toxicity of CMM to the heart. ECG abnormality induced by CMM is able to reflect myocardial diseases, such as arrhythmia, conduction block, and myocardial ischemia. However, ECG is difficult to detect the early cardiotoxicity induced by CMM if left ventricular ejection fraction (LVEF) is normal. Thus, ECG should be combined with other indicators to systematically evaluate the cardiotoxicity of CMM.

Histopathology

Histopathological examination, the highest standard for determining chemical drug-induced cardiotoxicity, can also be applied for evaluating CMM-induced cardiotoxicity. Inflammatory cell infiltration, myocardial rupture, and hemorrhage were clearly observed after a high dose Aconitum carmichaelii Debx. treatment in the cardiac muscle tissue of mice (Cai et al., 2013). Myocardial fiber breakage, cell swelling, and interstitial congestion were found in a larger number of mice exposed to triptolide (Yang et al., 2016). The dilated intercellular spaces were observed in severely damaged myocardium of Venenum Bufonis–treated rats, which were accompanied by abundant eosinophilic cytoplasm, obvious inflammatory cell infiltrations, and moderate piecemeal necrosis (Dong et al., 2015). Zebrafish has been widely applied to study the cardiotoxicity of new drugs with the advantages of small size and transparent body. Morphological abnormalities in zebrafish were observed and quantitatively assessed, including heart malformation, pericardial edema, circulation abnormalities, thrombosis, and hemorrhage (Yang et al., 2017).

Cell Morphology

To elucidate the potential mechanism, evaluation on CMM-induced cardiotoxicity should be deepened to the cellular and molecular levels. As an alternative to traditional animal model assessment, cytological evaluation in vitro has significant advantages in identifying early, mild, and potential toxicity of CMM (Chen et al., 2017). Toxic effects of CMM on myocardial cells could be visually determined through cell morphology observation. At present, the inverted phase contrast microscopy, fluorescence microscopy, transmission electron microscopy, and laser scanning confocal microscopy provide convenience for observing the microstructure and submicroscopic structures in cells. A study utilized a fluorescent microscope to observe the effects of As2O3 on bone marrow mesenchymal stem cells (BMSCs) through Hoechst 33,342 staining (Cai et al., 2010). Results demonstrated that As2O3 induced abnormal morphological features, such as cellular shrinkage and broken nuclei in BMSCs. In addition, hyperchromatic and dense fluorescent particles within the massive apoptotic nuclear cytoplasm were observed under fluorescence microscopy after aconitine administration (Ma et al., 2018). Beating rhythm, sarcomere shortening, and Ca2+ transients of ventricular myocytes were assessed during aconitine-induced cardiotoxicity using video-based sarcomere contractility and calcium recording module (Sun et al., 2014). One study evaluated the effects of aconitine on electrophysiological changes of ventricular myocytes by the patch-clamp recording technique. Results showed that APD for both 50 and 90% repolarization was significantly prolonged by aconitine at a dose of 1 μmol/l (Zhou et al., 2013). Another study assessed cell shortening of ventricular myocytes by a video-based edge-detection system. Results suggested that cinobufagin decreased the maximum cell shortening along with the decrease in Ca2+ transients (Liu et al., 2014).

Myocardial Zymogram

Myocardial enzymes widely distributed in cardiomyocytes will be released into the blood circulation if myocardial cells are damaged. These myocardial enzymes, including creatine kinases (CK), creatine kinase isoenzymes (CK-MB), lactic dehydrogenase (LDH), aspartate aminotransferases (AST), and α-hydroxybutyrate acid dehydrogenases (α-HBDH), are able to reflect myocardial ischemic necrosis or cell membrane permeability, which together form myocardial zymogram to evaluate CMM-induced cardiotoxicity. For example, studies showed that As2O3 could increase serum AST, CK, CK-MB, LDH, and α-HBDH levels in chicken, which were related to myocardial injury (Zhang et al., 2013a; Li et al., 2017). Rhododendri Mollis Flos–induced cardiotoxicity was evaluated by measuring the plasma levels of LDH, CK-MB, and AST (Dong et al., 2014). After SD rats were gavaged with Tripterygium wilfordii water decoction for 14 consecutive days, LDH and CK-MB levels in serum were significantly reduced, indicating that these enzymes were expected to early predict and identify CMM-induced cardiotoxicity (Wang et al., 2016a). LDH, AST, CK, and α-HBDH have poor specificity for evaluating drug-induced cardiotoxicity, while CK-MB has high sensitivity and specificity for diagnosing acute myocardial infarction. Studies revealed that the cardiotoxicity of anthracyclines could be manifested as a significant increase in CK-MB, which could be used as an indicator for the auxiliary diagnosis of heart damage (Chen et al., 2016). CK-MB detection also has a high application value in neonatal myocardial injury after asphyxia, which can provide a strong reference for clinical diagnosis (Huang, 2019). CK-MB is also more widely used in clinical monitoring of cardiotoxicity caused by drugs than brain natriuretic peptide (BNP) and N-terminal brain natriuretic peptide precursor (NT-proBNP). Clinical observation of 112 cancer patients treated with paclitaxel found that the incidences of paclitaxel-induced arrhythmia and myocardial zymogram abnormality were, respectively, 26.8 and 44.6% in the normal group, while that in the experimental group were, respectively, as high as 37.3 and 68.4%, indicating that myocardial zymogram was more sensitive to CMM-induced cardiac toxicity than arrhythmia (Lu and Chen, 2010).

Biomarkers

Proteins or Polypeptides

Some novel cardiac dysfunction markers, such as natriuretic peptides and myocardial proteins, have also been gradually applied to assess the cardiotoxicity of CMM. These natriuretic peptides, including atrial natriuretic peptide (ANP), BNP, and NT-proBNP, regulate the homeostasis of circulating volume and blood pressure, which have been widely used as markers for heart failure (Namdari et al., 2016; Maisel et al., 2018). Aristolochic acid upregulated the expression of BNP and ANP during the induction of zebrafish heart failure model (Shi et al., 2017). Troponins, including troponin T (cTnT) and troponin I (cTnI), are highly specific and sensitive to myocardial injury. Serum levels of cTnI and cTnT were significantly elevated during myocardial injury or infarction and heart failure (Panteghini, 2004; Horacek et al., 2007). cTnI and plasma granulase B in SD rats were significantly increased by water decoction of Tripterygium wilfordii. Studies on the cardiotoxicity of triptolide and Radix Aconiti extract revealed that serum cTnI level increased after administration (Lin et al., 2011; Xi et al., 2018). Acute aconitine intoxication manifested as remarkable elevation in serum CK, CK-MB, and cTnI levels (Lin et al., 2011). Myoglobin can reflect the extent of myocardial injury and the degree of myocardial necrosis. Myoglobin significantly increased in the early stage of myocardial injury before myocardial enzyme production, indicating that myoglobin is more sensitive than serum CK-MB for CMM-induced cardiotoxicity. However, myoglobin should be combined with troponins as biomarkers to evaluate the cardiac toxicity of drugs because of the low expression of myoglobin in myocardium. Although natriuretic peptides and troponins are recommended for assessing myocardial injuries with the advantages of higher specificity and sensitivity than myocardial enzymes, they are still less used for studying CMM-induced cardiotoxicity in clinical application. Cardiac fatty acid-binding protein (FABP) in the blood is better than CK and cTnI in the diagnosis of early myocardial injury (especially ≤ 3 h), which has high specificity and sensitivity for predicting CMM-induced myocardial damage (Wang et al., 2014b).

Metabolic Small Molecules

Some studies showed that citric acid, glutathione (GSH), phosphatidylcholine, and uric acid in serum could be used as biological indicators for detecting CMM-induced cardiotoxicity. Once the cardiovascular system is damaged, citric acid in serum decreases, while sugar and amino acid levels increase. The removal of intracellular reactive oxygen species (ROS) is usually accompanied by a reduction in GSH. Phosphatidylcholine is converted to arachidonic acid under the catalysis of phospholipase A2. Arachidonic acid is further converted into thromboxane A2 and thromboxane B2 by cycloprostaglandin H2 and oxygenase prostaglandin G2, thus inducing a series of cardiovascular diseases, such as blood stasis and thrombus. Therefore, phosphatidylcholine content sharply decreases under certain pathological conditions. A study found that the contents of endogenous biomarkers GSH, phosphatidylcholine, and citric acid in rat serum decreased, while ascorbic acid, uric acid, d-galactose, tryptophan, and l-phenylalanine levels increased after combined administration with ginseng and aconite (He et al., 2015). Once myocardium is short of blood or energy, ATP will be rapidly degraded to hypoxanthine and xanthine, and the final metabolite uric acid will be produced in large quantities, in which a large amount of ROS is generated, suggesting that uric acid level can reflect cardiovascular system damage. More than 20 biomarkers in serum and myocardial tissue of rats were detected after continuous gavage with Asarum sieboldii for 28 days by the nuclear magnetic resonance hydrogen spectroscopy (1HNMR), which was represented by a significant increase in lipid, lactic acid, alanine, pyruvic acid, dimethylglycine, β-glucose, and α-glucose contents, and a significant decrease in glutamic acid and tyrosine contents (You, 2016). At present, carbohydrate metabolites (α-ketoglutarate, malic acid, glucose, fructose, and succinic acid), sphingolipids (sphingosine, dihydrosphingosine, and phytosphingosine), organic acids (citric acid, pantothenic acid, and taurine), and carnitines (L-palmitoylcarnitine, L-acetyl carnitine, and isobutyryl-l-carnitine) can also be used as biomarkers for identifying CMM-induced cardiotoxicity (Qi et al., 2014). Studies showed that 11 biomarkers significantly decreased following the increased doses of periplocin extracted from Periploca sepium Bunge, including carnitine, acetylcarnitine, lysophosphatidylcholine, proline, glutamic acid, leucine, pantothenic acid, tryptophan, indole acrylic acid, and citric acid (Li et al., 2016a). These metabolites may affect the normal physiological function of the heart in terms of cell membrane stability, oxidative stress, mitochondrial damage, energy metabolism, cell homeostasis, and cell-to-cell signaling and interaction.

Genes

Omic technologies, especially genomics and transcriptomics, have gradually deepened in the field of drug toxicology, which provide new techniques for predicting new biomarkers to evaluate CMM-induced cardiotoxicity. Gene chip technology combined with real-time fluorescence quantitative analysis was applied to study acute toxicity of Venenum Bufonis on rat heart (Yang et al., 2011a). Results showed that Venenum Bufonis significantly altered the expression of Fxyd domain-containing ion transport regulator 3 (Fxyd3), Rho family GTPase 1 (Rnd1), ceruloplasmin, and Jun oncogene, which were involved in ion homeostasis, actin construction, and apoptosis. A study on the cardiotoxicity of aristolochic acid in zebrafish embryos revealed that a number of pro-inflammatory genes significantly increased, including COX-2, IL-1β, C/EBPB, C/EBPG, and SAA (Huang et al., 2007; Shi et al., 2017). In recent years, microRNAs have been linked to the cardiotoxicity of drugs, such as anthracyclines, bevacizumab, and cyclosporine A (Skala et al., 2019a). Some studies have found that the changes of some microRNAs are able to reflect the degree of myocardial injury in patients with acute myocardial infarction (AMI) (Yao, 2013). Studies suggested that As2O3 suppressed cardiac potassium channels via upregulating miR-21, miR-23a, miR-133, and miR-1 (Shan et al., 2013; Zhao et al., 2015). Although few studies about microRNAs are rarely involved in the cardiac toxicity of CMM, microRNAs have potential as early biomarkers and diagnostic tools for CMM-induced cardiotoxicity.

Mechanisms of CMM-Induced Cardiotoxicity

The risk compounds of CMM-induced cardiotoxicity directly or indirectly affect the structure and function of cardiomyocytes. Generally, multiple mechanisms interact with each other to induce cardiotoxicity, including ion homeostasis, oxidative stress and lipid peroxidation, mitochondrial damage, programmed cell death, inflammation, and metabolic disturbance (Figure 1).

FIGURE 1.

FIGURE 1

Interaction among oxidative stress, calcium overload, metabolic disturbance, mitochondrial damage, apoptosis, autophagy, and inflammation is involved in CMM-induced cardiotoxicity.

Interference With Ion Homeostasis

Various ion channels, including sodium, potassium, and calcium channels, are highly expressed on the myocardial cell membrane, which work together to maintain ion homeostasis in cardiomyocytes. Ion channel abnormalities on cardiomyocytes may lead to alterations in electrophysiological activity of the heart, ultimately inducing arrhythmias. The imbalance among sodium, potassium, and calcium ions in myocardial cells contributes to CMM-induced cardiotoxicity (Figure 2).

FIGURE 2.

FIGURE 2

Effects of the risk compounds in CMM on cardiac sodium, potassium, and calcium channels.

Sodium Channels

Sodium channel affects cardiomyocyte excitability, conductivity, auto-rhythm, and excitatory contraction coupling. The risk compounds of CMM-induced cardiotoxicity, especially alkaloids, can modulate the gating, permeability, and selectivity of voltage-gated sodium channels (VGSCs) by binding to site receptors. For example, aconitine binds to the site 2 receptor on VGSCs, thereby causing kinetic shift of sodium channels to trigger a persistent activation of sodium channels (Rao and Sikdar, 2000; Amran et al., 2004; Tak et al., 2016). In contrast to aconitine, a sodium channel agonist, lappaconitine irreversibly blocked human heart sodium channels by binding to the site 2 receptor (Wright, 2001). Moreover, batrachotoxin, one of the main active ingredients of Venenum Bufonis, is considered as a full activator on sodium channels, while aconitine and its analogs are served as partial activators (Wang et al., 2007). Grayanotoxins are toxic diterpenoids present in leaves of Rhododendron, Kalmia, Leucothoe, and Ericaceae (Yang et al., 2011b). Grayanotoxins exert selective effects on voltage-dependent sodium channels by eliminating fast sodium inactivation and inducing a hyperpolarizing shift in voltage dependence of channel activation (Maejima et al., 2003). Veratridine, a steroid-derived alkaloid derived from rhizomes of Veratrum album or seeds of Schoenocaulon officinale, preferentially binds to the activated sodium channels, thus impeding inactivation and increasing cell excitability (Chevalier et al., 2014). However, toxins secreted from scorpions are currently classified into two categories based on physiological effects on channel gating and binding properties: α-toxins that inhibit the fast inactivation process of sodium channels by binding to the site 3 receptor, and β-toxins that shift the threshold of channel activation to the negative membrane potentials by binding to the site 4 receptor (Ortiz and Possani, 2018; Wang et al., 2019b). SCN5A that is highly expressed in human cardiac muscle cells is the important gene encoding myocardial sodium channels, which controls the excitatory conduction of cardiac muscle cells. Studies showed that both aconitine and hypaconitine were shown to enhance mRNA expression of the SCN5A ion channel gene (Liu, 2007; Li et al., 2011). Abnormality in SCN5A gene expression can lead to an increase in sodium influx, which is associated with a variety of arrhythmias induced by some toxic CMM (Korkmaz et al., 2013).

Potassium Channels

The delayed rectifying potassium current (I kr) channel protein on human cardiomyocytes is encoded by human hERG. Studies demonstrated that the loss of hERG function and the inhibition of I kr caused by drugs prolonged QT interval and possibly induced TdP, thus leading to fatal arrhythmias (Liu et al., 2017). Some toxic CMM induce cardiotoxicity by directly inhibiting the expression of hERG channel protein or coding gene to suppress potassium channels. For instance, berberine blocked I k1, I k, and hERG channels expressed in Xenopus oocytes (Li et al., 2001). Diterpene alkaloids, such as aconitine and hypaconitine, induced QT interval prolongation through the inhibition of hERG potassium channels (Li et al., 2010; Xie et al., 2015; Kiss et al., 2017). Studies revealed that selectively targeting hERG channel contributes to the cardiotoxicity of strychnine (Wang et al., 2018). Celastrol inhibited the activities of hERG potassium channels, causal to QT interval prolongation (Sun et al., 2006). As2O3 induced expression deficiency of hERG potassium channel by decreasing specificity protein 1 (Sp1) level that upregulated hERG channel expression (Zhang et al., 2013b). MicroRNAs play a crucial role in regulating cardiac electrophysiological function by targeting potassium channel genes. Both miR-21 and miR-133 repressed the expression and transcription of hERG in As2O3-induced hERG inhibition. CMM also reduced I kr through disrupting hERG trafficking without channel blockage. For example, berberine and arsenic induced hERG channel deficiency by inhibiting channel trafficking (Ficker et al., 2004; Eckhard Ficker and Peter Hawryluk, 2004). Unfolded protein response (UPR) was activated by channel trafficking inhibition, and endoplasmic reticulum (ER)-restricted hERG was ubiquitinated and degraded in lysosomes and proteasomes (Zhang et al., 2014). In addition, some CMM reduce I kr via promoting hERG channel protein degradation, which involves the regulation of related genes, proteins, and signaling pathways. The integral membrane protein caveolin-1 is co-localized with hERG on the cell surface, which has been reported to be involved in the drug-induced reduction of hERG plasma-membrane expression (Lin et al., 2008). Berberine was proved to reduce hERG membrane stability by disrupting caveolin-1 (Rodriguez-Menchaca et al., 2006; Yan et al., 2015). Lysosomal and proteasome degradation of hERG on the plasma membrane were accelerated during As2O3-induced cardiotoxicity. Further research showed that As2O3 decreased the caveolin-1 level, which accounted for As2O3-triggered hERG degradation (Yan et al., 2017). Certainly, some CMM can also affect potassium channels by suppressing I to, I k1, I kur, and I kATP. Aconitine acted on both I kur and I k1 potassium channel inhibition (Wang et al., 2008; Kiss et al., 2017). Aconitine also could cause changes in I to current channel of rat cardiomyocytes by reducing voltage-gated potassium channel 4.3 (Kv4.3) mRNA expression (Dong et al., 2009). Celastrol has a dual effect on I k1 channel, including blocking potassium channel and inhibiting channel protein expression on cell surface (Sun et al., 2006). As2O3 activated I kATP and inhibited I k1 via upregulating miR-1 expression (Shan et al., 2013).

Calcium Homeostasis

Calcium is one of the most ubiquitous signal transduction molecules, which mediates various biological functions, such as cell excitability and conductivity, excitation–contraction coupling, and programmed cell death (Landstrom et al., 2017). Intracellular calcium homeostasis involves a dynamic balance between intracellular calcium intake and calcium emission. Abnormality of L-type Ca2+ currents (I Ca-L), ryanodine receptor (RyR), sarcoplasmic reticulum Ca2+-ATPase (SERCA), and sodium–calcium exchanger (NCX) disrupts calcium homeostasis. Cardiac calcium homeostasis disorder contributes to adverse reactions induced by CMM. I Ca-L is activated upon membrane depolarization, and then Ca2+ influx triggers the release of Ca2+ via calcium release channels in sarcoplasmic reticulum (SR) (Bito et al., 2008; Eisner et al., 2009). Therefore, disturbance of I Ca-L channel can lead to fatal cardiac arrhythmias (Eden et al., 2016). Bradycardia and hypotension caused by improper use of aconite may be attributed to the inhibition of I Ca-L channels (Chou et al., 2018). Aconitine could block I Ca-L channels and calcium-induced calcium release (CICR) in human-induced pluripotent stem cell–derived cardiomyocytes (hiPSC-CMs) (Wu et al., 2017). RyR is a calcium-release channel on ER/SR, which also plays a crucial role in maintaining intracellular calcium concentration. The sensitivity changes of RyR2 to Ca2+ release activation have been implicated in arrhythmias and heart failure (Dobrev and Wehrens, 2014; Landstrom et al., 2017). RyR2 activation may have a direct relationship with aconitine-induced arrhythmias (Fu et al., 2008). A study showed that aconitine significantly increased mRNA and protein expressions of RyR2 and NCX, thereby leading to uncoupling of Ca2+ signaling (Scriven et al., 2000; Bers, 2002). Oleander extract might markedly increase calcium concentration by inhibiting RyR in cardiomyocytes (Poindexter et al., 2007). RyR activity can be regulated by calmodulin (CaM) or calmodulin kinase (CaMK). For example, hypaconitine could downregulate CaM mRNA and protein expression, thus inhibiting CaMK II activation and RyR2 phosphorylation (Yi et al., 2012). Furthermore, CaM inhibits the opening of calcium release channel by binding to RyR2 (Sigalas et al., 2009a; Sigalas et al., 2009b). Intracellular Ca2+ diffusion is highly restricted due to the elaborate cytosolic Ca2+ chelating machinery. Intracellular calcium is mainly excreted through NCX and SERCA2a (Muller, 2018). NCX plays a pivotal role in regulating contractility and electrical activity in the heart. Studies found that arrhythmogenesis toxicity of aconitine was related to the increased expression of NCX (Fu et al., 2007; Zhou et al., 2013). NCX can operate in both Ca2+ efflux and influx modes depending on the internal and external concentrations of Na+ and Ca2+. Therefore, disturbance of NCX and SERCA function may destroy cytoplasmic calcium ion gradient, which not only induces calcium overload but also hinders the rapid entry of calcium ions into the cytosol after the ion channel is opened. Multiple studies have demonstrated that Ca2+ overload leads to oxidative damage and ER stress (Dong et al., 2010; Groenendyk et al., 2010; Chao et al., 2012; Guo et al., 2013; Xie et al., 2015). As2O3 inhibited SERCA2a activity in a time-dependent manner, thereby triggering ER stress (Zhang et al., 2016a). Aconitine-induced cardiotoxicity is related to intracellular Ca2+ elevation by accelerating I Ca-L, increasing NCX expression, and decreasing the SERCA2a level (Zhou et al., 2013). Intracellular calcium homeostasis imbalance is one of the most important mechanisms underlying CMM-induced cardiotoxicity.

Ion Transport–Related ATPases

Ion transport–related ATPases also contribute to the cardiotoxicity of CMM. Sodium–potassium ATPase (Na+-K+ ATPase) maintains intracellular potassium and sodium ion gradients via consuming ATP. The steep sodium and potassium gradients in animal cells not only contribute to the rapid signal transmission through the opening of sodium or potassium selective channels in the plasma membrane in response to extracellular signals but also are used to facilitate the secondary transport of sugars, neurotransmitters, amino acids, metabolites, and some ions, such as H+, Ca2+, and Cl (Clausen et al., 2017). Egyptian green toad Bufo viridis skin secretions and bufalin inhibited the Na+-K+ ATPase activity, thus inducing cardiac adverse reaction (Roger et al., 2002; Abdel-Rahman et al., 2010). Ca2+-ATPase and Ca2+-Mg2+ ATPase can promote the removal of Ca2+ from cell membrane after myocardial contraction. Once the activities of these Ca2+-ATPases decreased, intracellular Ca2+ continuously increased to Ca2+ overload. Aconitine could cause calcium overload, which involved the inhibition of Na+-K+ ATPase, Ca2+-ATPase, and Ca2+-Mg2+ ATPase activities (Zhang et al., 2016b).

Oxidative Stress

Oxidative stress is a result of overproduction of oxidative-free radicals and ROS (Newsholme et al., 2016). Excessive oxidative stress not only directly causes DNA and protein damage but also induces lipid peroxidation, calcium overload, mitochondrial structure and function damage, and cell death, thereby inducing myocardial damage (Manna et al., 2008; Zhang et al., 2013a; Xu et al., 2014; Yang et al., 2017). Previous studies found that triptolide increased intracellular ROS, which in turn depolarized mitochondrial membrane potential (MMP), reduced the Bax/Bcl-2 ratio, released cytochrome C, activated caspase-3, and ultimately triggered cell apoptosis (Zhou et al., 2014). Similarly, evodiamine also increased intracellular ROS level, induced lipid peroxidation, and caused changes in cell membrane stability, ultimately resulting in myocardial damage (Yang et al., 2017). Oxidative stress also can trigger the inflammatory reaction and inhibit ATPase activity. For example, ROS induced by As2O3 was able to activate pro-inflammatory genes and upregulate the expression of inflammatory cytokines, leading to the occurrence of inflammatory reaction in myocardium. As2O3 also inhibited the ROS-mediated myocardial membrane ATPase activity and disrupted the steady state of intracellular electrolytes (Binu et al., 2017; Li et al., 2017). Moreover, calcium mobilization can affect ROS generation, and on the contrary, the presence of ROS induces Ca2+ influx (Giambelluca and Gende, 2008; Holmstrom and Finkel, 2014). ROS can regulate calcium pump, enzyme, and receptor activities to maintain normal physiological function of cardiomyocytes (Feissner et al., 2009). Additionally, ROS impairs mitochondrial structure and function both alone and in combination with calcium overload (Webster, 2012). Mitochondria permeability transition pore (mPTP) is sensitive to both ROS and calcium overload, thereby triggering endogenous pathways of programmed necrosis and death.

Cardiomyocytes can activate an antioxidative stress cell defense system to resist myocardial damage caused by oxidative stress. However, long-term or excessive use of CMM that can induce cardiotoxicity will destroy the antioxidant defense system and further aggravate oxidative stress. For example, As2O3 reduced GSH-dependent antioxidant and anti-peroxidase enzymes, while increasing free radicals, intracellular Ca2+ concentration, and lipid peroxidation, thereby further exacerbating oxidative damage (Sfaxi et al., 2016; Varghese et al., 2017). Another study also showed that As2O3 induced ROS generation and downregulated the expression of Nrf2 and heme oxidase (HO-1) genes (Zhang et al., 2013a).

Mitochondrial Toxicity

Mitochondria are one of the most critical target organs for cardiotoxicity induced by CMM. Some CMM can directly damage mitochondrial structure and function. For example, As2O3 promoted mitochondrial peroxide production; significantly reduced the activity of respiratory chain complexes, such as mitochondrial complexes I, III, and IV; reduced MMP; and caused mitochondrial swelling in H9c2 cardiomyocytes (Vineetha et al., 2015). Mitochondrial dysfunction is characterized by an increase in mitochondrial outer membrane permeabilization (MOMP), which induces mitochondrial swelling following proapoptotic protein release, electron transport chain disruption, and ATP depletion (Zhang et al., 2018a). The opening of mPTP contributes to MOMP changes via the depletion of MMP. The persistent opening of mPTP is now recognized as a major inducement of cell death. Triptolide inhibited superoxide dismutase (SOD) and catalase (CAT) activities, induced ROS accumulation, reduced MMP, and eventually led to mitochondrial toxicity (Yang et al., 2016). Experiments in vivo and in vitro showed that triptolide permeabilized the outer mitochondrial membrane and promoted the opening of mPTP, thereby causing mitochondrial dysfunction and apoptosis (Wang et al., 2016b; Xi et al., 2018). In addition, CMM that has cardiotoxicity can also indirectly damage myocardial mitochondria by regulating mitochondrial outer membrane integrity, mitochondrial dynamics, mitochondria-dependent apoptosis genes, and proteins. For instance, triptolide triggered MOMP through the p53-regulated Bcl-2 family, which elicited mitochondria dysfunction and apoptosis (Xi et al., 2018). As2O3 reduced peroxisome proliferator-activated receptor gamma coactivator 1 (PGC-1α) level, and disrupted mitochondrial synthesis and fission and fusion function (Di et al., 2018).

Induction of Cell Death

Oxidative stress and calcium overload are the main inducements for triggering programmed cell death in cardiomyocytes. As mentioned above, long-term unreasonable use of cardiotoxic CMM can induce ROS generation and disturb calcium homeostasis. One study showed that As2O3 could initiate ER stress apoptosis pathway through ATF6, PERK, and IRE1 (Zhang et al., 2017). As an active programmed cell death pathway, apoptosis is regulated by multiple signaling pathways. Aconitine could upregulate the expression of p38 MAPKs, further damage MMP, induce changes in mitochondrial permeability, activate caspase-3, and ultimately result in mitochondria-dependent apoptosis (Sun et al., 2014). The p53 signaling pathway plays an important regulatory role in triptolide-induced apoptosis (Xi et al., 2018). Triptolide downregulated the expression of Nrf2 and induced the ROS-triggered mitochondrial apoptosis pathway (Vineetha et al., 2018). The serine/threonine kinase Akt signaling pathway was also found to be involved in the regulation of As2O3-induced mitochondrial apoptosis in cardiomyocytes (Wang et al., 2013). Autophagic degradation of cellular components is essential to maintain cellular homeostasis. Hence, autophagy, another type of programmed cell death, contributes to cardiotoxicity induced by CMM. Excessive release of ROS is one of the main endogenous factors to enhance autophagy (Scherz-Shouval et al., 2007). As2O3 induced autophagy and apoptosis by promoting oxidative stress (Fan et al., 2014). The signaling pathways currently known to participate in the regulation of autophagy comprise Parkin, ROCK, PI3K/Akt/mTOR, p70S6 kinase, and ERK1/2 (Huang et al., 2015; Zhou et al., 2015). Another study showed that As2O3 induced a perturbation in Parkin-mediated mitophagy (Watanabe et al., 2014). Besides, arsenic induced cardiac damage and autophagy via activating the PI3K/Akt/mTOR pathway in the hearts of chickens (Li et al., 2018b). Excessive autophagy was susceptible to various cardiovascular events, such as ischemia-reperfusion injury (Zheng and Bao, 2017). Autophagy can suppress apoptosis under normal physiological conditions. For example, aconitine induced autophagy and apoptosis, in which autophagy had an antagonistic effect on apoptosis (Hu et al., 2018). Whether autophagy is beneficial or detrimental depends on intracellular autophagic machinery and the burden of substrate receptor proteins targeted for autophagy (Baehrecke, 2005).

Involvement of Substance Metabolism

Amino Acid Metabolism

Amino acid metabolism affects protein synthesis, energy metabolism, redox balance, and intracellular material homeostasis. Metabolic disorders of various amino acids, such as tryptophan, leucine, alanine, proline, lysine, and tyrosine, were involved in CMM-induced cardiotoxicity. Tryptophan plays a vital role in maintaining cell growth and energy metabolism. In metabolomic studies of some CMM, such as Radix Aconiti Kusnezoffii (Caowu), Radix Aconiti Lateralis Preparata (Fuzi), Pinellia ternata, and Periploca sepium Bunge, tryptophan significantly reduced in myocardial cells, which affected energy supply to produce cardiotoxicity (Wang et al., 2012; Zhang et al., 2013c; Li et al., 2016a). In addition, experimental results showed that valine, leucine, and proline all decreased in cardiomyocytes exposed to periplocin, suggesting that amino acid metabolism disorders occurred during periplocin-induced cardiomyocyte toxicity (Li et al., 2016a). Lysine, alanine, and arginine in serum of Venenum Bufonis–treated rats showed a decreasing trend, indicating that oxidative stress injury and energy metabolism disturbance were induced by Venenum Bufonis (Dong et al., 2015). Different from the above amino acids, l-carnitine is a type of nonprotein amino acid. Carnitine and acetylcarnitine are also involved in fatty acid transport and oxidation by mitochondrial enzymes, which is essential for the formation of acetyl-CoA (Reuter and Evans, 2012; Li et al., 2015). Furthermore, l-carnitine also has antioxidant activity to improve mitochondrial function. Periplocin significantly reduced carnitine and acetylcarnitine in myocardial tissues, revealing that tricarboxylic acid (TCA) cycle related with energy metabolism was interfered (Li et al., 2016a). On the contrary, both l-carnitine and l-acetylcarnitine significantly increased after Pinelliae Rhizoma administration (Zhang et al., 2013c).

Lipid Metabolism

Fatty acids and their derivatives are involved in saturated fatty acid oxidation and unsaturated fatty acid peroxidation. β-oxidation of fatty acids, an important pathway for mitochondrial function in cardiomyocytes, is closely related to glucose metabolism and apoptosis in cardiomyocytes. In myocardial lipidomic study of Fuzi, arachidonic acid, linoleic acid, and eicosapentaenoic acid displayed declining tendencies, while saturated fatty acid levels, such as stearic acid and 5-tridecynoic acid, were upgraded. Peroxidation of unsaturated fatty acids produces active free radicals that induce oxidative stress. Accordingly, abnormal peroxidation of unsaturated fatty acids caused by Fuzi contributed to oxidation damage in myocardial mitochondria (Cai et al., 2013). Similarly, oleic acid and linoleic acid were downregulated, while arachidonic acid was upregulated in the metabolomic study of Venenum Bufonis. Venenum Bufonis could interfere with lipid metabolism through the inhibition of free fatty acid reacylation or the activation of protein kinase pathways, thereby inducing heart damage (Liang et al., 2011).

As a critical component of cellular membranes, phospholipids interact with all membrane proteins and various non-membrane proteins, thus mediating signal transduction. Significant changes of sphingosine, phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine, lysophosphatidylethanolamine, and lysophosphatidylcholine were uncovered in CMM-induced cardiotoxicity. These substances are involved in metabolic pathways, such as phospholipid and sphingolipid metabolism. For example, Caowu- and Fuzi-induced cardiotoxicity were responsible for sphingolipid metabolism (Wang et al., 2012). Sphingolipids have emerged as key mediators of stress responses (An et al., 2011). Sphingolipid metabolism disorder resulted in increased plasma-membrane fluidity, which rendered them susceptible to ROS, thus enhancing oxidative damage to cellular proteins (Rao et al., 2007). Studies showed that perturbation of phospholipid or sphingolipid metabolism contributed to Pinellia ternate and periplocin-induced cardiotoxicity (Zhang et al., 2013c; Li et al., 2016a).

Glucose Metabolism

Abnormal blood glucose is an important trigger for cardiovascular diseases. The anaerobic glycolysis and aerobic oxidation of glucose in metabolism pathway are the main link for ATP production. Metabolomic studies showed that various cardiotoxic CMM induced glucose metabolism disturbance, which mainly involved some metabolites changes, such as pyruvic acid, malic acid, citric acid, and succinate (Li et al., 2008; Li et al., 2016a). These organic acids as an important intermediate of cell cycle affect TCA cycle of myocardial cells and energy metabolism. In addition, metabolomic analysis of aconitum alkaloids showed that lactate and lipids levels increased, while glucose reduced in myocardial cells, demonstrating that aconitum alkaloids induced abnormality in energy utilization with a higher glycolysis rate (Sun et al., 2009).

Other Mechanisms

DNA damage, inflammatory response, and trace element homeostasis imbalance may also be involved in CMM-induced cardiotoxicity. For instance, berberine and arsenic could induce DNA damage in heart cells (Manna et al., 2008; Xu et al., 2014). Triptolide inhibited RNA polymerase by covalently binding to a subunit of transcription initiation factor TFIIH, which led to the inhibition of nucleotide excision repair and DNA damage (Titov et al., 2011). Venenum Bufonis inhibited the expression of Fxyd domain-containing ion transport regulator 3 (Fxyd3) and ceruloplasmin (Cp) genes, which resulted in the accumulation of Fe2+ in cardiac cells to destroy contractile function of the heart (Yang et al., 2011a). Recently, inflammatory response plays a critical role in the development, course, severity, and outcomes of heart failure (Papadimitriou and Kalogeropoulos, 2015). As2O3 and aristolochic acid could trigger inflammatory response, which was related to the progressive development of cardiac defects (Li et al., 2017; Shi et al., 2017). A study on the cardiotoxicity of aristolochic acid in zebrafish embryos revealed that a number of pro-inflammatory genes increased, including COX-2, IL-1β, C/EBPB, C/EBPG, and SAA (Huang et al., 2007; Shi et al., 2017). Venenum Bufonis–induced cardiotoxicity might involve inflammatory response through TXNIP/TRX/NF-κB and MAPK/NF-κB pathways (Bi et al., 2016). In addition, As2O3 was reported to disturb trace elements’ homeostasis, which favored the progression of mitochondrial damage (Sfaxi et al., 2016; Li et al., 2018a).

Discussion

With the booming market of CMM worldwide, a new evaluation system must be formulated for assessing drug efficacy, effectiveness, and toxicity to optimize the therapeutic and preventive potential of CMM. In recent years, the safety of CMM has been paid more and more attention by clinicians, patients, and scientific researchers, such as the cardiotoxicity of aconitum species, the hepatotoxicity of Polygonum multiflorum, and the nephrotoxicity of aristolochic acids. Some CMM have been proven to present obvious cardiotoxicity in literature records, case reports, and experimental studies. In response to the problem of adverse cardiac reactions induced by CMM, research teams have carried out a large number of studies on the performances and characteristics, toxic substance basis, and mechanisms of cardiotoxicity induced by CMM, their extracts, or single compounds. Our review concluded the risk compounds, preclinical toxicity evaluation, and potential mechanisms of CMM-induced cardiotoxicity, which was beneficial to establish a preclinical evaluation system for CMM safety to promote the development of new drugs.

CMM has a complex source, numerous varieties, and a wide variety of phytochemical components. Most of CMM have substances with toxicity and efficacy dual characters, such as aconitine, bufotoxin, and cardiac glycosides (Peng, 2017; Peng et al., 2017). Furthermore, toxic compounds and active compounds containing the same type of CMM can be transformed into each other under different physiological and pathological conditions. For example, diester alkaloids derived from aconitum species are considered highly toxic substances, while they have also proved to be the main active ingredient for the treatment of pain and leukemia (Nie et al., 2017). In addition, chemical composition and content may change under different planting resources, processing methods, or drug compatibility. Thus, more and more researchers select risk compounds in CMM as the research objects to explore the mechanisms of CMM-induced cardiotoxicity. With the advancement of modern separation and analysis technologies, the types and quantities of monomer compounds in traditional toxic CMM are increasing. High-throughput analysis methods, such as omic technology, high content analysis, molecular docking, and network pharmacology, are used to determine the risk substances of CMM-induced cardiotoxicity (Shi et al., 2016; Su et al., 2016; He et al., 2019). Based on the phytochemical structures of toxic substances in CMM, these risk compounds mainly include alkaloids, terpenoids, steroids, heavy metals, organic acids, and toxic proteins or peptides. Alkaloids are the biggest category of risk compounds present in CMM that induce cardiotoxicity, including diterpene alkaloids, isoquinoline alkaloids, indole alkaloids, and others. Terpenoids are also an important substance of CMM-induced cardiotoxicity, such as triptolide, celastrol, and rhodojaponin. Various steroids, including cardiac glycosides, bufadienolides, and ophiopogonin, also contribute to CMM-induced cardiotoxicity. In addition, heavy metals, organic acids, toxic proteins, and peptides are involved in CMM-induced cardiotoxicity. Phytomedicine is easily affected by environmental pollution, thus inducing heavy metals to exceed the standard, and mineral drugs contain high levels of heavy metals, such as arsenic, mercury, and lead. Toxic plants and animals carry or secrete organic acids, toxic proteins, or peptides to defense natural enemies.

Multicomponent, multi-target, and multichannel characteristics of CMM make the toxicological mechanism very complicated. Most of the previous studies focus on single compound, single target, or single pathway to explore the mechanism of CMM-induced cardiotoxicity. With the development of various modern biological techniques, such as systematic toxicology, network toxicology, and computer toxicology, the network interaction mechanism in CMM-induced cardiotoxicity is gradually uncovered. We searched the related literature for the latest twenty years, mainly focusing on cell and animal experiments. Various mechanisms, including ion homeostasis, oxidative stress, mitochondrial damage, apoptosis and autophagy, and metabolic disturbance, are involved in CMM-induced cardiotoxicity. Excessive activation or inhibition of ion channels, including sodium, potassium, and calcium channels, contributes to arrhythmia. Ion channels can become the targets for many toxic CMM, such as aconitine, hypaconitine, berberine, and Venenum Bufonis. Therefore, imbalance among sodium, potassium, and calcium ions is the important mechanism of CMM-induced cardiotoxicity. Overproduction of ROS resulting in oxidative damage has been testified to be the vital factor for calcium overload, which suggested that oxidative damage affected intracellular calcium homeostasis. Mitochondria are highly susceptible to ROS generation. The risk substances in CMM can directly or indirectly influence mitochondrial structure and function, thus presenting mitochondrial toxicity. Both oxidative stress and abnormal ion homeostasis lead to excessive apoptosis and autophagy in cardiomyocytes. Apoptosis and autophagy-related genes or pathways may be activated or inhibited to regulate cell fate. Abnormal metabolism in cardiac cells also results in cardiotoxicity. Mitochondria toxicity induced by the risk compounds in CMM can affect cell energy metabolism. In addition, substance metabolism, including amino acid, lipids, and glucose, was also reported to be involved in the cardiotoxicity of CMM. Thus, multiple mechanisms may be orderly involved in the cardiotoxicity induced by CMM, and an interactive effect between these mechanisms is demonstrated. Although the material basis of CMM-induced toxicity and efficacy can be transformed into each other under certain conditions, researches on the dosage, opportunity, and body status of transformation mechanism between the toxicity and efficacy are still scarce. Therefore, the toxicity–efficacy transformation mechanism underlying the “dose–time–efficacy/toxicity” path is urgent to be clarified for evaluating the cardiotoxicity of CMM (Peng et al., 2008; Peng, 2017; Peng et al., 2017).

In clinical studies, there are few specific evaluation indicators for CMM-induced cardiotoxicity. At present, evaluation on CMM-induced cardiotoxicity mainly takes the indicators of cardiac function and structural damage caused by chemical drugs as a reference, including ECG, myocardial zymogram, echocardiography, endomyocardial biopsy, and biomarkers. In preclinical evaluation or new drug development stage, the cardiotoxicity of CMM should be systematically evaluated at the overall, tissue, cellular, and molecular levels. Overall evaluation is mainly based on cardiac function evaluation, including conventional ECG, echocardiography, and MRI, which is especially manifested with QT/QTc interval prolongation or TdP. Comprehensive study of QT/QTc is the most critical link of drug cardiac safety evaluation (Food and Drug Administration, 2005). Observation on the histopathological changes of the heart caused by CMM is one of the specific diagnostic criteria. For example, although endomyocardial biopsy technique is recognized as the most sensitive and specific method for evaluating cardiac toxicity induced by drugs, it is invasive examination with high technical requirements (Jones and Miles, 2005). At the cellular level, it is possible to observe changes in cell morphology, myocardial cell pulsation, cell survival rate, and cell membrane integrity, which are of great significance for revealing the mechanism of drug-induced cardiotoxicity. Serum myocardial zymogram, including CK, CK-MB, LDH, and AST, may be slightly different because of different test kits. Due to the poor specificity of LDH, AST, and CK for assessing cardiotoxicity, CK-MB is the commonly used clinical myocardial enzyme. Drug-induced heart injury can lead to many biomarkers changes in the early stage, including proteins or polypeptides, metabolic small molecules, and genes. Common proteins or peptides include cardiac troponins, BNP, NT-proBNP, ANP, and H-FABP. cTnT/TnI can detect early cardiotoxicity caused by anthracyclines. BNP and NT-proBNP can objectively determine the severity of heart failure. H-FABP is the most ideal myocardial marker for identifying myocardial injury. Small metabolic molecules include citric acid, GSH, phosphatidylcholine, and uric acid in serum. Metabolomic method is expected to find more specific small metabolic molecules for evaluating CMM-induced cardiotoxicity (Su et al., 2016; Liu et al., 2019). In addition, genes related to cardiotoxicity are also used to early identify the cardiotoxicity of CMM, such as transcription factors, inflammatory factors, pathway regulatory genes, and microRNAs. MicroRNAs have potential as early biomarkers and diagnostic tools for cardiotoxicity (Skala et al., 2019a).

Conclusion

Numerous reports about drug safety have brought more cautions that CMM is associated with several cardiovascular events, suggesting that evaluation on the cardiac safety of CMM is quite urgent. CMM-induced cardiotoxicity is characterized by diverse components, multiple manifestations, and complex mechanisms. Thus, we concluded the risk compounds, preclinical toxicity evaluation, and potential mechanisms of CMM-induced cardiotoxicity through screening the related studies for the last twenty years. It is worth noting that a complex network regulation relationship among these risk compounds, toxic effects, and toxic mechanisms is being gradually revealed. Frontier technologies, such as omics, systematic toxicology, and network pharmacology, provide important support for revealing this network interaction relationship. Our review is greatly beneficial to understand the relationship between the toxicity and efficacy induced by CMM and provide a reference for establishing the cardiac safety evaluation system of CMM.

Author Contributions

All authors listed have made a substantial, direct, and intellectual contribution to the work and approved it for publication.

Funding

This work was supported by the National Natural Science Foundation of China (82004056, 82003879, 81891010, 81891012, and 81630101), Sichuan Science and Technology Agency Foundation (2018JZ0081), and Xinlin Scholar Research Promotion Project of Chengdu University of Traditional Chinese Medicine (XGZX2011).

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

ABBREVIATIONS

CMM

Chinese materia medica

ECG

Electrocardiogram

ICH

International Conference on Harmonisation

CNKI

China National Knowledge Infrastructure

hERG

Human ether-a-go-go-related gene

HR

Heart rate

MRI

Magnetic resonance imaging

APD

Action potential duration

TdP

Torsades de pointes

LVEF

Left ventricular ejection fraction

BMSCs

Bone marrow mesenchymal stem cells

CK

Creatine kinases

CK-MB

Creatine kinase isoenzymes

LDH

Lactic dehydrogenase

AST

Aspartate aminotransferases

α-HBDH

α-Hydroxybutyrate acid dehydrogenases

BNP

Brain natriuretic peptide

NT-proBNP

N-terminal brain natriuretic peptide precursor

ANP

Atrial natriuretic peptide

cTnT

Troponin T

cTnI

Troponin I

FABP

Fatty acid–binding protein

GSH

Glutathione

ROS

Reactive oxygen species

1HNMR

Nuclear magnetic resonance hydrogen spectroscopy

Fxyd3

Fxyd domain-containing ion transport regulator 3

Fxyd domain-containing ion transport regulator 3

Rnd1

Rho family GTPase 1

AMI

Acute myocardial infarction

VGSCs

Voltage-gated sodium channels

Sp1

Specificity protein 1

UPR

Unfolded protein response

ER

Endoplasmic reticulum

Kv4.3

Voltage-gated potassium channel 4.3

ICa-L

L-type Ca2+ currents

RyR

Ryanodine receptor

SERCA

Sarcoplasmic reticulum Ca2+-ATPase

NCX

Sodium–calcium exchanger

SR

Sarcoplasmic reticulum

CICR

Calcium-induced calcium release

hiPSC-CMs

Human-induced pluripotent stem cell–derived cardiomyocytes

CaM

Calmodulin

CaMK

Calmodulin kinase

MMP

Mitochondrial membrane potential

mPTP

Mitochondria permeability transition pore

HO-1

Heme oxidase

MOMP

Mitochondrial outer membrane permeabilization

PGC-1α

Peroxisome proliferator-activated receptor gamma coactivator 1

TCA

Tricarboxylic acid

Fxyd3

Fxyd domain-containing ion transport regulator 3

Fxyd domain-containing ion transport regulator 3

Cp

Ceruloplasmin

References

  1. Abdel-Rahman M. A., Ahmed S. H., Nabil Z. I. (2010). In vitro cardiotoxicity and mechanism of action of the Egyptian green toad Bufo viridis skin secretions. Toxicol. Vitro 24 (2), 480–485. 10.1016/j.tiv.2009.09.021 [DOI] [PubMed] [Google Scholar]
  2. Adamson P. B., Suarez J., Ellis E., Kanaly T., Vanoli E. (2004). Ephedrine increases ventricular arrhythmias in conscious dogs after myocardial infarction. J. Am. Coll. Cardiol. 44 (8), 1675–1678. 10.1016/j.jacc.2004.07.041 [DOI] [PubMed] [Google Scholar]
  3. Amran M. S., Hashimoto K., Homma N. (2004). Effects of sodium-calcium exchange inhibitors, KB-R7943 and SEA0400, on aconitine-induced arrhythmias in guinea pigs in vivo, in vitro, and in computer simulation studies. J. Pharmacol. Exp. Ther. 310 (1), 83–89. 10.1124/jpet.104.066951 [DOI] [PubMed] [Google Scholar]
  4. An D., Na C., Bielawski J., Hannun Y. A., Kasper D. L. (2011). Membrane sphingolipids as essential molecular signals for Bacteroides survival in the intestine. Proc. Natl. Acad. Sci. USA 108 (Suppl. 1), 4666–4671. 10.1073/pnas.1001501107 [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Baehrecke E. H. (2005). Autophagy: dual roles in life and death? Nat. Rev. Mol. Cell Biol. 6 (6), 505–510. 10.1038/nrm1666 [DOI] [PubMed] [Google Scholar]
  6. Balakumar P., Kaur J. (2009). Arsenic exposure and cardiovascular disorders: an overview. Cardiovasc. Toxicol. 9 (4), 169–176. 10.1007/s12012-009-9050-6 [DOI] [PubMed] [Google Scholar]
  7. Bao Z., Han Z., Zhang B., Yu Y., Xu Z., Ma W., et al. (2019). Arsenic trioxide blocked proliferation and cardiomyocyte differentiation of human induced pluripotent stem cells: implication in cardiac developmental toxicity. Toxicol. Lett. 309, 51–58. 10.1016/j.toxlet.2019.03.008 [DOI] [PubMed] [Google Scholar]
  8. Barbey J. T., Pezzullo J. C., Soignet S. L. (2003). Effect of arsenic trioxide on QT interval in patients with advanced malignancies. J. Clin. Oncol. 21 (19), 3609–3615. 10.1200/JCO.2003.10.009 [DOI] [PubMed] [Google Scholar]
  9. Bers D. M. (2002). Cardiac excitation-contraction coupling. Nature 415 (6868), 198–205. 10.1038/415198a [DOI] [PubMed] [Google Scholar]
  10. Bi Q. R., Hou J. J., Qi P., Ma C. H., Feng R. H., Yan B. P., et al. (2016). TXNIP/TRX/NF-κB and MAPK/NF-κB pathways involved in the cardiotoxicity induced by Venenum Bufonis in rats. Sci. Rep. 6, 22759. 10.1038/srep22759 [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Binu P., Priya N., Abhilash S., Vineetha R. C., Nair R. H. (2017). Studies on curative efficacy of monoterpene eugenol on anti- leukemic drug arsenic trioxide induced cardiotoxicity. Biomed. Pharmacother. 91, 559–566. 10.1016/j.biopha.2017.04.087 [DOI] [PubMed] [Google Scholar]
  12. Bito V., Heinzel F. R., Biesmans L., Antoons G., Sipido K. R. (2008). Crosstalk between L-type Ca2+ channels and the sarcoplasmic reticulum: alterations during cardiac remodelling. Cardiovasc. Res. 77 (2), 315–324. 10.1093/cvr/cvm063 [DOI] [PubMed] [Google Scholar]
  13. Botelho A. F. M., Santos-Miranda A., Joca H. C., Mattoso C. R. S., de Oliveira M. S., Pierezan F., et al. (2017). Hydroalcoholic extract from Nerium oleander L. (Apocynaceae) elicits arrhythmogenic activity. J. Ethnopharmacol. 206, 170–177. 10.1016/j.jep.2017.05.031 [DOI] [PubMed] [Google Scholar]
  14. Cai B. Z., Meng F. Y., Zhu S. L., Zhao J., Liu J. Q., Liu C. J., et al. (2010). Arsenic trioxide induces the apoptosis in bone marrow mesenchymal stem cells by intracellular calcium signal and caspase-3 pathways. Toxicol. Lett. 193 (2), 173–178. 10.1016/j.toxlet.2010.01.001 [DOI] [PubMed] [Google Scholar]
  15. Cai Y., Gao Y., Tan G., Wu S., Dong X., Lou Z., et al. (2013). Myocardial lipidomics profiling delineate the toxicity of traditional Chinese medicine Aconiti Lateralis radix praeparata. J. Ethnopharmacol. 147 (2), 349–356. 10.1016/j.jep.2013.03.017 [DOI] [PubMed] [Google Scholar]
  16. Chao C. C., Huang C. C., Lu D. Y., Wong K. L., Chen Y. R., Cheng T. H., et al. (2012). Ca2+ store depletion and endoplasmic reticulum stress are involved in P2X7 receptor-mediated neurotoxicity in differentiated NG108-15 cells. J. Cell Biochem. 113 (4), 1377–1385. 10.1002/jcb.24010 [DOI] [PubMed] [Google Scholar]
  17. Chen E. H., Liang J. Q., Song X. N. (2016). Analysis on cardiotoxicity related indexes of anthracycline antitumor drugs. Shenzhen J. Integr. Tradit Chin. West Med. 26 (12), 24–25. 10.3892/mco.2019.1854 [DOI] [Google Scholar]
  18. Chen H. M., Xie X. F., Peng C. (2017). In vitro cytotoxicity evaluation indicator and test methods applied in toxicology of traditional Chinese medicine. Chin. J. Exper Tradit Med. Formulae 23 (22), 202–210. 10.13422/j.cnki.syfjx.2017220202 [DOI] [Google Scholar]
  19. Chen X., Shan H., Zhao J., Hong Y., Bai Y., Sun I., et al. (2010). L-type calcium current (ICa,L) and inward rectifier potassium current (Ik1) are involved in QT prolongation induced by arsenic trioxide in rat. Cell Physiol Biochem. 26 (6), 967–974. 10.1159/000324005 [DOI] [PubMed] [Google Scholar]
  20. Chevalier M., Amuzescu B., Gawali V., Todt H., Knott T., Scheel O., et al. (2014). Late cardiac sodium current can be assessed using automated patch-clamp. F1000Res. 3, 245. 10.12688/f1000research.5544.1 [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Chou P. Y., Wang C. C., Tai C. J., Yang T. L., Tang Y. J. (2018). Bradycardia and hypotension from improper use of aconite root: a case report and brief review. Complement. Med. Res. 25 (5), 338–343. 10.1159/000489179 [DOI] [PubMed] [Google Scholar]
  22. Clausen M. V., Hilbers F., Poulsen H. (2017). The structure and function of the Na,K-ATPase isoforms in health and disease. Front. Physiol. 8, 371. 10.3389/fphys.2017.00371 [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Demiryürek A. T., Yildiz G., Eşiyok S., Altuğ S. (2002). Protective effects of poly (ADP-ribose) synthase inhibitors on digoxin-induced cardiotoxicity in guinea-pig isolated hearts. Pharmacol. Res. 45 (3), 189–194. 10.1006/phrs.2002.0945 [DOI] [PubMed] [Google Scholar]
  24. Demiryürek A. T., Demiryürek S. (2005). Cardiotoxicity of digitalis glycosides: roles of autonomic pathways, autacoids and ion channels. Autonom Auta Pharm. 25 (2), 35–52. 10.1111/j.1474-8673.2004.00334.x [DOI] [PubMed] [Google Scholar]
  25. Deng L. J., Wang L. H., Peng C. K., Li Y. B., Huang M. H., Chen M. F., et al. (2017). Fibroblast activation protein α activated tripeptide bufadienolide antitumor prodrug with reduced cardiotoxicity. J. Med. Chem. 60 (13), 5320–5333. 10.1021/acs.jmedchem.6b01755 [DOI] [PubMed] [Google Scholar]
  26. Di W., Lv J., Jiang S., Lu C., Yang Z., Ma Z., et al. (2018). PGC-1: the energetic regulator in cardiac metabolism. Curr. Issues Mol. Biol. 28, 29–46. 10.21775/cimb.028.029 [DOI] [PubMed] [Google Scholar]
  27. Dobrev D., Wehrens X. H. (2014). Role of RyR2 phosphorylation in heart failure and arrhythmias: controversies around ryanodine receptor phosphorylation in cardiac disease. Circ. Res. 114 (8), 1311–1319. 10.1161/CIRCRESAHA.114.300568 [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Dong G., Wei D., Wang J., Guo P., Li M., Yang M., et al. (2015). Study of the cardiotoxicity of Venenum Bufonis in rats using an 1H NMR-based metabolomics approach. PLoS One 10 (3), e0119515. 10.1371/journal.pone.0119515 [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Dong L. C., Zhang X. H., Ma J., Luo N., Song W., Li P., et al. (2014). The integrated pharmacokinetics of major rhodojaponins correlates with the cardiotoxicity after oral administration of Rhododendri Mollis Flos extract in rats. J. Ethnopharmacol. 157, 69–78. 10.1016/j.jep.2014.09.021 [DOI] [PubMed] [Google Scholar]
  30. Dong S., Teng Z., Lu F. H., Zhao Y. J., Li H., Ren H., et al. (2010). Post-conditioning protects cardiomyocytes from apoptosis via PKC(epsilon)-interacting with calcium-sensing receptors to inhibit endo(sarco)plasmic reticulum-mitochondria crosstalk. Mol. Cell Biochem. 341 (1-2), 195–206. 10.1007/s11010-010-0450-5 [DOI] [PubMed] [Google Scholar]
  31. Dong X., Zhao S. P., Liu Y., et al. (2009). Protective effect of Liquiritin on cardiocyte injury of neonate rat induced by aconitine. China J. Tradi Chin. Med. Pharm. 24 (2), 163–166. [Google Scholar]
  32. Eden M., Meder B., Völkers M., Poomvanicha M., Domes K., Branchereau M., et al. (2016). Myoscape controls cardiac calcium cycling and contractility via regulation of L-type calcium channel surface expression. Nat. Commun. 7, 11317. 10.13155/ncomms11317 [DOI] [PMC free article] [PubMed] [Google Scholar]
  33. Eisner D. A., Kashimura T., Venetucci L. A., Trafford A. W. (2009). From the ryanodine receptor to cardiac arrhythmias. Circ. J. 73 (9), 1561–1567. 10.1253/circj.cj-09-0478 [DOI] [PubMed] [Google Scholar]
  34. Fan X. J., Yu H., Ren J. (2011). Homeostasis and compensatory homeostasis: bridging western medicine and traditional Chinese medicine. Curr. Cardiol. Rev. 7, 43–46. 10.2174/157340311795677671 [DOI] [PMC free article] [PubMed] [Google Scholar]
  35. Fan Y., Chen M., Meng J., Yu L., Tu Y., Wan L., et al. (2014). Arsenic trioxide and resveratrol show synergistic anti-leukemia activity and neutralized cardiotoxicity. PLoS One 9 (8), e105890. 10.1371/journal.pone.0105890 [DOI] [PMC free article] [PubMed] [Google Scholar]
  36. Feissner R. F., Skalska J., Gaum W. E., Sheu S. S. (2009). Crosstalk signaling between mitochondrial Ca2+ and ROS. Front. Biosci. (Landmark Ed) 14, 1197–1218. 10.2741/3303 [DOI] [PMC free article] [PubMed] [Google Scholar]
  37. Ficker E., Kuryshev Y. A., Dennis A. T., Obejero-Paz C., Wang L., Hawryluk P., et al. (2004). Mechanisms of arsenic-induced prolongation of cardiac repolarization. Mol. Pharmacol. 66 (1), 33–44. 10.1124/mol.66.1.33 [DOI] [PubMed] [Google Scholar]
  38. Food and Drug Administration (2005). ICH E14 the Clinical evaluation of QT/QTcinterval prolongation and proarrhythmic potential for non-antiarrhythmic drugs. Silver Spring, MD: Food and Drug Administration. [Google Scholar]
  39. Fu M., Li R. X., Fan L., He G. W., Thornburg K. L., Wang Z. (2008). Sarcoplasmic reticulum Ca2+ release channel ryanodine receptor (RyR2) plays a crucial role in aconitine-induced arrhythmias. Biochem. Pharmacol. 75 (11), 2147–2156. 10.1016/j.bcp.2008.02.027 [DOI] [PMC free article] [PubMed] [Google Scholar]
  40. Fu M., Wu M., Wang J. F., Qiao Y. J., Wang Z. (2007). Disruption of the intracellular Ca2+ homeostasis in the cardiac excitation-contraction coupling is a crucial mechanism of arrhythmic toxicity in aconitine-induced cardiomyocytes. Biochem. Biophys. Res. Commun. 354 (4), 929–936. 10.1016/j.bbrc.2007.01.082 [DOI] [PubMed] [Google Scholar]
  41. Giambelluca M. S., Gende O. A. (2008). Hydrogen peroxide activates calcium influx in human neutrophils. Mol. Cell Biochem. 309 (1-2), 151–156. 10.1007/s11010-007-9653-9 [DOI] [PubMed] [Google Scholar]
  42. Groenendyk J., Sreenivasaiah P. K., Kim D. H., Agellon L. B., Michalak M. (2010). Biology of endoplasmic reticulum stress in the heart. Circ. Res. 107 (10), 1185–1197. 10.1161/CIRCRESAHA.110.227033 [DOI] [PubMed] [Google Scholar]
  43. Guo J., Bian Y., Bai R., Li H., Fu M., Xiao C. (2013). Globular adiponectin attenuates myocardial ischemia/reperfusion injury by upregulating endoplasmic reticulum Ca2+-ATPase activity and inhibiting endoplasmic reticulum stress. J. Cardiovasc. Pharmacol. 62 (2), 143–153. 10.1097/FJC.0b013e31829521af [DOI] [PubMed] [Google Scholar]
  44. Halkin A., Roth A., Lurie I., Fish R., Belhassen B., Viskin S. (2001). Pause-dependent torsade de pointes following acute myocardial infarction: a variant of the acquired long QT syndrome. J. Am. Coll. Cardiol. 38 (4), 1168–1174. 10.1016/s0735-1097(01)01468-1 [DOI] [PubMed] [Google Scholar]
  45. He J., Wu P., Dong Y., Gao R. (2019). Adverse reactions analysis of Aconiti Lateralis Radix Praeparata and mechanism prediction of cardiac toxicity by network pharmacology. China J. Chin. Mater. Med. 44 (5), 1010–1018. 10.19540/j.cnki.cjcmm.20181205.003 [DOI] [PubMed] [Google Scholar]
  46. He J. L., Zhao J. W., Ma Z. C., Liang Q. D., Wang Y. G., Tan H. L., et al. (2015). Cardiotoxicity study of Shenfu compatibility in rats based on metabonomics. Zhongguo Zhong Yao Za Zhi 40 (14), 2743–2747. 10.4268/cjcmm20151412 [DOI] [PubMed] [Google Scholar]
  47. Holmström K. M., Finkel T. (2014). Cellular mechanisms and physiological consequences of redox-dependent signalling. Nat. Rev. Mol. Cell Biol. 15 (6), 411–421. 10.1038/nrm3801 [DOI] [PubMed] [Google Scholar]
  48. Horacek J. M., Pudil R., Jebavy L., Tichy M., Zak P., Maly J. (2007). Assessment of anthracycline-induced cardiotoxicity with biochemical markers. Exp. Oncol. 29 (4), 309–313. [PubMed] [Google Scholar]
  49. Hou W., Huang Z. X., Xu H. G., Lin J., Zhang D. M., Peng Q. L., et al. (2018). Hybrids of arenobufagin and benzoisoselenazol reducing the cardiotoxicity of arenobufagin. Bioorg. Med. Chem. Lett. 28 (20), 3391–3394. 10.1016/j.bmcl.2018.08.038 [DOI] [PubMed] [Google Scholar]
  50. Hu C. M., Cheng Y. W., Liao J. W., Cheng H. W., Kang J. J. (2005). Induction of contracture and extracellular Ca2+ influx in cardiac muscle by sanguinarine: a study on cardiotoxicity of sanguinarine. J. Biomed. Sci. 12 (2), 399–407. 10.1007/s11373-005-3007-y [DOI] [PubMed] [Google Scholar]
  51. Hu T. T., Tang X., Wen H., Xie X., Peng C., Rao C. (2018). Study the effects and mechanism of autophagy in H9C2 cardiomyocytes apoptosis induced by aconitine. J. Chin. Med. Mater. 41 (5), 1191–1196. 10.13863/j.issn1001-4454.2018.05.039 [DOI] [Google Scholar]
  52. Huang C. C., Chen P. C., Huang C. W., Yu J. (2007). Aristolochic Acid induces heart failure in zebrafish embryos that is mediated by inflammation. Toxicol. Sci. 100 (2), 486–494. 10.1093/toxsci/kfm235 [DOI] [PubMed] [Google Scholar]
  53. Huang G. Z., Li L., Liu L. (2009). Pathological study on autopsy died of Tripterygium intoxication—report of 4 cases. Zhongguo Zhong Xi Yi Jie He Za Zhi 29 (2), 165–168. [PubMed] [Google Scholar]
  54. Huang J. W. (2019). The clinical value of Mb, cTnI and CK-MB in myocardial injury after neonatal asphyxia. J. Clin. Med. Liter 6 (98), 178. 10.16281/j.cnki.jocml.2019.98.110 [DOI] [Google Scholar]
  55. Huang Y. C., Yu H. S., Chai C. Y. (2015). Roles of oxidative stress and the ERK1/2, PTEN and p70S6K signaling pathways in arsenite-induced autophagy. Toxicol. Lett. 239 (3), 172–181. 10.1016/j.toxlet.2015.09.022 [DOI] [PubMed] [Google Scholar]
  56. Jones R. L., Miles D. W. (2005). Use of endomyocardial biopsy to assess anthracycline-induced cardiotoxicity. Lancet Oncol. 6 (2), 67. 10.1016/S1470-2045(05)01719-5 [DOI] [PubMed] [Google Scholar]
  57. Karturi S. P., Gudmundsson H., Akhtar M., Jahangir A., Choudhuri I. (2016). Spectrum of cardiac manifestations from aconitine poisoning. Heartrhythm Case Rep. 2 (5), 415–420. 10.1016/j.hrcr.2016.05.007 [DOI] [PMC free article] [PubMed] [Google Scholar]
  58. Kiss T., Borcsa B., Orvos P., Tálosi L., Hohmann J., Csupor D. (2017). Diterpene lipo-alkaloids with selective activities on cardiac K+ channels. Planta Med. 83 (17), 1321–1328. 10.1055/s-0043-109556 [DOI] [PubMed] [Google Scholar]
  59. Korkmaz S., Zitron E., Bangert A., Seyler C., Li S., Hegedüs P., et al. (2013). Provocation of an autoimmune response to cardiac voltage-gated sodium channel NaV1.5 induces cardiac conduction defects in rats. J. Am. Coll. Cardiol. 62 (4), 340–349. 10.1016/j.jacc.2013.04.041 [DOI] [PubMed] [Google Scholar]
  60. Kostakis C., Byard R. W. (2009). Sudden death associated with intravenous injection of toad extract. Forensic Sci. Int. 188 (1–3), e1–e5. 10.1016/j.forsciint.2009.02.006 [DOI] [PubMed] [Google Scholar]
  61. Landstrom A. P., Dobrev D., Wehrens X. H. T. (2017). Calcium signaling and cardiac arrhythmias. Circ. Res. 120 (12), 1969–1993. 10.1161/CIRCRESAHA.117.310083 [DOI] [PMC free article] [PubMed] [Google Scholar]
  62. Li A., Guo X., Xie J., Liu X., Zhang Z., Li Y., et al. (2016a). Validation of biomarkers in cardiotoxicity induced by Periplocin on neonatal rat cardiomyocytes using UPLC-Q-TOF/MS combined with a support vector machine. J. Pharm. Biomed. Anal. 123, 179–185. 10.1016/j.jpba.2016.02.014 [DOI] [PubMed] [Google Scholar]
  63. Li B. X., Yang B. F., Zhou J., Xu C. Q., Li Y. R. (2001). Inhibitory effects of berberine on Ik1, Ik, and HERG channels of cardiac myocytes. Acta Pharmacol. Sin 22 (2), 125–131. [PubMed] [Google Scholar]
  64. Li L., Sun B., Zhang Q., Fang J., Ma K., Li Y., et al. (2008). Metabonomic study on the toxicity of Hei-Shun-Pian, the processed lateral root of Aconitum carmichaelii Debx. (Ranunculaceae). J. Ethnopharmacol. 116 (3), 561–568. 10.1016/j.jep.2008.01.014 [DOI] [PubMed] [Google Scholar]
  65. Li M., Xie X., Chen H., Xiong Q., Tong R., Peng C., et al. (2020). Aconitine induces cardiotoxicity through regulation of calcium signaling pathway in zebrafish embryos and in H9c2 cells. J. Appl. Toxicol. 40 (6), 780–793. 10.1002/jat.3943 [DOI] [PubMed] [Google Scholar]
  66. Li S., Zhao H., Wang Y., Shao Y., Wang B., Wang Y., et al. (2018b). Regulation of autophagy factors by oxidative stress and cardiac enzymes imbalance during arsenic or/and copper induced cardiotoxicity in Gallus gallus. Ecotoxicol Environ. Saf. 148, 125–134. 10.1016/j.ecoenv.2017.10.018 [DOI] [PubMed] [Google Scholar]
  67. Li S., Zhao H. J., Wang Y., Shao Y., Liu Y., Xing Y. (2018a). Arsenic-induced cardiotoxicity correlates with mitochondrial damage and trace elements imbalance in broiler chickens. Poult. Sci. 98 (2), 734–744. 10.3382/ps/pey469 [DOI] [PubMed] [Google Scholar]
  68. Li S. W., Sun X., He Y., Guo Y., Zhao H. J., Hou Z. J., et al. (2017). Assessment of arsenic trioxide in the heart of Gallus gallus: alterations of oxidative damage parameters, inflammatory cytokines, and cardiac enzymes. Environ. Sci. Pollut. Res. Int. 24 (6), 5781–5790. 10.1007/s11356-016-8223-7 [DOI] [PubMed] [Google Scholar]
  69. Li X., Zhang R., Zhao B., Lossin C., Cao Z. (2016b). Cardiotoxicity screening: a review of rapid-throughput in vitro approaches. Arch. Toxicol. 90 (8), 1803–1816. 10.1007/s00204-015-1651-1 [DOI] [PubMed] [Google Scholar]
  70. Li X. J., Jiang Z. Z., Zhang L. Y. (2014). Triptolide: progress on research in pharmacodynamics and toxicology. J. Ethnopharmacol. 155 (1), 67–79. 10.1016/j.jep.2014.06.006 [DOI] [PubMed] [Google Scholar]
  71. Li Y., Ju L., Hou Z., Deng H., Zhang Z., Wang L., et al. (2015). Screening, verification, and optimization of biomarkers for early prediction of cardiotoxicity based on metabolomics. J. Proteome Res. 14 (6), 2437–2445. 10.1021/pr501116c [DOI] [PubMed] [Google Scholar]
  72. Li Y., Tu D., Xiao H., Du Y., Zou A., Liao Y., et al. (2010). Aconitine blocks HERG and Kv1.5 potassium channels. J. Ethnopharmacol. 131 (1), 187–195. 10.1016/j.jep.2010.06.025 [DOI] [PubMed] [Google Scholar]
  73. Li Z. Y., Tan P., Zhu K. J., Li F., Sun J. (2011). Effects of hypoaconitine on mRNA expression of sodium channel SCN5A and sodium-calcium exchange protein in myocardial cells. Guangdong Med. J. 32 (20), 2637–2639. 10.13820/j.cnki.gdyx.2011.20.006 [DOI] [Google Scholar]
  74. Liang X. P., Zhang Z., Hu P., Zhong H.-F. (2011). Metabonomics study on the acute toxicity of Toad Venom. Chem. J. Chin. Univ. 32 (01), 38–43. [Google Scholar]
  75. Lin C. C., Phua D. H., Deng J. F., Yang C. C. (2011). Aconitine intoxication mimicking acute myocardial infarction. Hum. Exp. Toxicol. 30 (7), 782–785. 10.1177/0960327110385960 [DOI] [PubMed] [Google Scholar]
  76. Lin J., Lin S., Choy P. C., Shen X., Deng C., Kuang S., et al. (2008). The regulation of the cardiac potassium channel (HERG) by caveolin-1. Biochem. Cell Biol. 86 (5), 405–415. 10.1139/o08-118 [DOI] [PubMed] [Google Scholar]
  77. Lin Q., Wang C., Jia Z., Xiong H., Xue X., Liu M., et al. (2020). UPLC-HDMS-based on serum metabolomics reveals the toxicity of arecae semen. J. Ethnopharmacol. 247, 112223. 10.1016/j.jep.2019.112223 [DOI] [PubMed] [Google Scholar]
  78. Liu C., Yang J., Fu W., Qi S., Wang C., Quan C., et al. (2014). Coactivation of the PI3K/Akt and ERK signaling pathways in PCB153-induced NF-κB activation and caspase inhibition. Toxicol. Appl. Pharmacol. 277 (3), 270–278. 10.1016/j.taap.2014.03.027 [DOI] [PubMed] [Google Scholar]
  79. Liu C., Zhang C., Wang W., Yuan F., He T., Chen Y., et al. (2019). Integrated metabolomics and network toxicology to reveal molecular mechanism of celastrol induced cardiotoxicity. Toxicol. Appl. Pharmacol. 383, 114785. 10.1016/j.taap.2019.114785 [DOI] [PubMed] [Google Scholar]
  80. Liu Y., Li D., Nie D., Liu S. K., Qiu F., Liu M. T., et al. (2017). Arsenic trioxide and angiotensin II have inhibitory effects on HERG protein expression: evidence for the role of PML SUMOylation. Oncotarget 8 (28), 45447–45458. 10.18632/oncotarget.17563 [DOI] [PMC free article] [PubMed] [Google Scholar]
  81. Liu Y. (2007). Study on the myocardial toxicity of Aconitum alkaloidsMaster. Shenyang, China: Shenyang Pharmaceutical University. [Google Scholar]
  82. Lu Y. C., Chen D. C. (2010). Clinical observation of paclitaxel-induced cardiotoxicity. Natl. Med. Front. China 5 (18), 49–50. 10.3969/j.issn.1673-5552.2010.18.0033 [DOI] [Google Scholar]
  83. Luo L., Li B., Wang S., Wu F., Wang X., Liang P., et al. (2018). Centipedes subdue giant prey by blocking KCNQ channels. Proc. Natl. Acad. Sci. USA 115 (7), 1646–1651. 10.1073/pnas.1714760115 [DOI] [PMC free article] [PubMed] [Google Scholar]
  84. Ma B. L., Ma Y. M., Shi R., Wang T. M., Zhang N., Wang C. H., et al. (2010). Identification of the toxic constituents in rhizoma coptidis. J. Ethnopharmacol. 128 (2), 357–364. 10.1016/j.jep.2010.01.047 [DOI] [PubMed] [Google Scholar]
  85. Ma L. Q., Yu Y., Chen H., Li M., Ihsan A., Tong H. Y., et al. (2018). Sweroside alleviated aconitine-induced cardiac toxicity in H9c2 cardiomyoblast cell line. Front. Pharmacol. 9, 1138. 10.3389/fphar.2018.01138 [DOI] [PMC free article] [PubMed] [Google Scholar]
  86. Maejima H., Kinoshita E., Seyama I., Yamaoka K. (2003). Distinct sites regulating grayanotoxin binding and unbinding to D4S6 of Na(v)1.4 sodium channel as revealed by improved estimation of toxin sensitivity. J. Biol. Chem. 278 (11), 9464–9471. 10.1074/jbc.M212133200 [DOI] [PubMed] [Google Scholar]
  87. Maisel A. S., Duran J. M., Wettersten N. (2018). Natriuretic peptides in heart failure: atrial and B-type natriuretic peptides. Heart Fail. Clin. 14 (1), 13–25. 10.1016/j.hfc.2017.08.002 [DOI] [PubMed] [Google Scholar]
  88. Manna P., Sinha M., Sil P. C. (2008). Arsenic-induced oxidative myocardial injury: protective role of arjunolic acid. Arch. Toxicol. 82 (3), 137–149. 10.1007/s00204-007-0272-8 [DOI] [PubMed] [Google Scholar]
  89. Mikaelian I., Buness A., de Vera-Mudry M. C., Kanwal C., Coluccio D., Rasmussen E., et al. (2010). Primary endothelial damage is the mechanism of cardiotoxicity of tubulin-binding drugs. Toxicol. Sci. 117 (1), 144–151. 10.1093/toxsci/kfq189 [DOI] [PubMed] [Google Scholar]
  90. Mioulane M., Foldes G., Ali N. N., Schneider M. D., Harding S. E. (2012). Development of high content imaging methods for cell death detection in human pluripotent stem cell-derived cardiomyocytes. J. Cardiovasc. Transl Res. 5 (5), 593–604. 10.1007/s12265-012-9396-1 [DOI] [PMC free article] [PubMed] [Google Scholar]
  91. Müller M. (2018). [Disturbances of calcium homeostasis]. Anasthesiol Intensivmed Notfallmed Schmerzther 53 (7-08), 516–528. 10.1055/s-0043-121655 [DOI] [PubMed] [Google Scholar]
  92. Naik S. D., Freudenberger R. S. (2004). Ephedra-associated cardiomyopathy. Ann. Pharmacother. 38 (3), 400–403. 10.1345/aph.1D408 [DOI] [PubMed] [Google Scholar]
  93. Namdari M., Eatemadi A., Negahdari B. (2016). Natriuretic peptides and their therapeutic potential in heart failure treatment: an updated review. Cell Mol. Biol. (Noisy-le-grand) 62 (11), 1–7. 10.14715/cmb/2016.62.11.1 [DOI] [PubMed] [Google Scholar]
  94. National Medical Products Administration (2019). National adverse drug reaction monitoring annual report. Chin. J. Drug Eval. 36, p476–480. [Google Scholar]
  95. Newsholme P., Cruzat V. F., Keane K. N., Carlessi R., de Bittencourt P. I. (2016). Molecular mechanisms of ROS production and oxidative stress in diabetes. Biochem. J. 473 (24), 4527–4550. 10.1042/BCJ20160503C [DOI] [PubMed] [Google Scholar]
  96. Nie J., Wang F., Ji T., Zhao J., Zhao F. (2017). Assessment of in vitro cardiotoxicity of extract fractions and diterpene alkaloids from Aconitum leucostomum Worosch: a short communication. J. Pharm. Biomed. Anal. 137, 84–89. 10.1016/j.jpba.2017.01.003 [DOI] [PubMed] [Google Scholar]
  97. Nouira S., Elatrous S., Besbes L., Boukef R., Devaux C., Aubrey N., et al. (2005). Neurohormonal activation in severe scorpion envenomation: correlation with hemodynamics and circulating toxin. Toxicol. Appl. Pharmacol. 208 (2), 111–116. 10.1016/j.taap.2005.01.017 [DOI] [PubMed] [Google Scholar]
  98. Nyirimigabo E., Xu Y., Li Y., Wang Y., Agyemang K., Zhang Y. (2015). A review on phytochemistry, pharmacology and toxicology studies of Aconitum. J. Pharm. Pharmacol. 67 (1), 1–19. 10.1111/jphp.12310 [DOI] [PubMed] [Google Scholar]
  99. Nyska A., Murphy E., Foley J. F., Collins B. J., Petranka J., Howden R., et al. (2005). Acute hemorrhagic myocardial necrosis and sudden death of rats exposed to a combination of ephedrine and caffeine. Toxicol. Sci. 83 (2), 388–396. 10.1093/toxsci/kfi034 [DOI] [PubMed] [Google Scholar]
  100. Odening K. E., Jung B. A., Lang C. N., Cabrera Lozoya R., Ziupa D., Menza M., et al. (2013). Spatial correlation of action potential duration and diastolic dysfunction in transgenic and drug-induced LQT2 rabbits. Heart Rhythm 10 (10), 1533–1541. 10.1016/j.hrthm.2013.07.038 [DOI] [PubMed] [Google Scholar]
  101. Ortiz E., Possani L. D. (2018). Scorpion toxins to unravel the conundrum of ion channel structure and functioning. Toxicon 150, 17–27. 10.1016/j.toxicon.2018.04.032 [DOI] [PubMed] [Google Scholar]
  102. Pan X., Zhou J., Chen Y., Xie X., Rao C., Liang J., et al. (2020). Classification, hepatotoxic mechanisms, and targets of the risk ingredients in traditional Chinese medicine-induced liver injury. Toxicol. Lett. 323, 48–56. 10.1016/j.toxlet.2020.01.026 [DOI] [PubMed] [Google Scholar]
  103. Panteghini M. (2004). Role and importance of biochemical markers in clinical cardiology. Eur. Heart J. 25 (14), 1187–1196. 10.1016/j.ehj.2004.04.026 [DOI] [PubMed] [Google Scholar]
  104. Papadimitriou L., Kalogeropoulos A. P. (2015). Inflammatory biomarkers and therapeutic targets in heart failure. Curr. Med. Chem. 22 (23), 2716–2726. 10.2174/0929867322666150415152532 [DOI] [PubMed] [Google Scholar]
  105. Peng C. (2017). Thought and practice of multidimensional evaluation and integrated analysis on toxicity and efficacy of radix Aconiti lateralis praeparata. World Chin. Med. 12 (11), 2543–2550. 10.1016/j.jpba.2017.06.049 [DOI] [Google Scholar]
  106. Peng C., Wang C. E., Lin N. (2008). The significance and practice of fundamental research on the correlation between toxicity and efficacy of toxic Chinese materia medica. Pharmacol. Clin. Chin. Mater. Med. 24 (1), 71–73. 10.13412/j.cnki.zyyl.2008.01.004 [DOI] [Google Scholar]
  107. Peng C., Xiao X. H., Li S., et al. (2017). Research progress and Frontier of integrated analysis of “toxicity” and “effect” of traditional Chinese medicine. Bull. Natl. Nat. Sci. Found China 31 (2), 176–183. 10.3389/fphar.2020.556885 [DOI] [Google Scholar]
  108. Peng F., Zhang N., Wang C., Wang X., Huang W., Peng C., et al. (2020). Aconitine induces cardiomyocyte damage by mitigating BNIP3-dependent mitophagy and the TNFα-NLRP3 signalling axis. Cell Proliferat. 53 (1). 10.1111/cpr.12701 [DOI] [PMC free article] [PubMed] [Google Scholar]
  109. Poindexter B. J., Feng W., Dasgupta A., Bick R. J. (2007). Oleandrin produces changes in intracellular calcium levels in isolated cardiomyocytes: a real-time fluorescence imaging study comparing adult to neonatal cardiomyocytes. J. Toxicol. Environ. Health Part A. 70 (6), 568–574. 10.1080/15287390600882408 [DOI] [PubMed] [Google Scholar]
  110. Qi Z. Z., Zhang Y. L., Wang S. L., Wang C., Wang X., Huang Z., et al. (2014). Research on biomarkers in rats with cardiac inury induced by isoprenaline. J. Biomed. Eng. Res. 33 (4), 240–244. 10.19529/j.cnki.1672-6278.2014.04.008 [DOI] [Google Scholar]
  111. Quintero-Hernandez V., Jiménez-Vargas J. M., Gurrola G. B., Valdivia H. H., Possani L. D. (2013). Scorpion venom components that affect ion-channels function. Toxicon 76, 328–342. 10.1016/j.toxicon.2013.07.012 [DOI] [PMC free article] [PubMed] [Google Scholar]
  112. Ramirez-Ortega M., Zarco G., Maldonado V., Carrillo J. F., Ramos P., Ceballos G., et al. (2007). Is digitalis compound-induced cardiotoxicity, mediated through guinea-pig cardiomyocytes apoptosis?. Eur. J. Pharmacol. 566 (1–3), 34–42. 10.1016/j.ejphar.2007.03.033 [DOI] [PubMed] [Google Scholar]
  113. Rao R. P., Yuan C., Allegood J. C., Rawat S. S., Edwards M. B., Wang X., et al. (2007). Ceramide transfer protein function is essential for normal oxidative stress response and lifespan. Proc. Natl. Acad. Sci. USA 104 (27), 11364–11369. 10.1073/pnas.0705049104 [DOI] [PMC free article] [PubMed] [Google Scholar]
  114. Rao S., Sikdar S. K. (2000). Modification of alpha subunit of RIIA sodium channels by aconitine. Pflugers Arch. 439 (3), 349–355. 10.1007/s004249900121 [DOI] [PubMed] [Google Scholar]
  115. Ren S. J., Xu H. H., Li M., Hao F.-R. (2017). Cytotoxicity of ophiopogonin D′ for rat H9c2 cardiomyocytes. Chin. J. Pharmacol. Toxicol. 31 (4), 325–331. 10.1002/jbt.21917 [DOI] [Google Scholar]
  116. Reuter S. E., Evans A. M. (2012). Carnitine and acylcarnitines: pharmacokinetic, pharmacological and clinical aspects. Clin. Pharmacokinet. 51 (9), 553–572. 10.2165/11633940-000000000-00000 [DOI] [PubMed] [Google Scholar]
  117. Rodriguez-Menchaca A., Ferrer-Villada T., Lara J., Fernandez D., Navarro-Polanco R. A., Sanchez-Chapula J. A. (2006). Block of HERG channels by berberine: mechanisms of voltage- and state-dependence probed with site-directed mutant channels. J. Cardiovasc. Pharmacol. 47 (1), 21–29. 10.1097/01.fjc.0000191564.52242.00 [DOI] [PubMed] [Google Scholar]
  118. Roger R. J., Bick B. J., Sweney R. R., Dasgupta A. 2002). Effects of Chan Su, a traditional Chinese medicine, on the calcium transients of isolated cardiomyocytes: cardiotoxicity due to more than Na, K-ATPase blocking. Life Sci. 72 (6), 699–709. 10.1016/s0024-3205(02)02302-0 [DOI] [PubMed] [Google Scholar]
  119. Samenuk D., Link M. S., Homoud M. K., Contreras R., Theoharides T. C., Wang P. J., et al. (2002). Adverse cardiovascular events temporally associated with ma huang, an herbal source of ephedrine. Mayo Clin. Proc. 77 (1), 12–16. 10.4065/77.1.12 [DOI] [PubMed] [Google Scholar]
  120. Scherz-Shouval R., Shvets E., Fass E., Shorer H., Gil L., Elazar Z. (2007). Reactive oxygen species are essential for autophagy and specifically regulate the activity of Atg4. EMBO J. 26 (7), 1749–1760. 10.1038/sj.emboj.7601623 [DOI] [PMC free article] [PubMed] [Google Scholar]
  121. Scott G. I., Colligan P. B., Ren B. H., Ren J. (2001). Ginsenosides Rb1 and Re decrease cardiac contraction in adult rat ventricular myocytes: role of nitric oxide. Br. J. Pharmacol. 134, 1159–1165. 10.1038/sj.bjp.0704377 [DOI] [PMC free article] [PubMed] [Google Scholar]
  122. Scriven D. R., Dan P., Moore E. D. (2000). Distribution of proteins implicated in excitation-contraction coupling in rat ventricular myocytes. Biophys. J. 79 (5), 2682–2691. 10.1016/S0006-3495(00)76506-4 [DOI] [PMC free article] [PubMed] [Google Scholar]
  123. Sfaxi I., Charradi K., Limam F., El May M. V., Aouani E. (2016). Grape seed and skin extract protects against arsenic trioxide induced oxidative stress in rat heart. Can. J. Physiol. Pharmacol. 94 (2), 168–176. 10.1139/cjpp-2015-0088 [DOI] [PubMed] [Google Scholar]
  124. Shan H., Zhang Y., Cai B., Chen X., Fan Y., Yang L., et al. (2013). Upregulation of microRNA-1 and microRNA-133 contributes to arsenic-induced cardiac electrical remodeling. Int. J. Cardiol. 167 (6), 2798–2805. 10.1016/j.ijcard.2012.07.009 [DOI] [PubMed] [Google Scholar]
  125. Shi J., Cao B., Wang X. W., Aa J. Y., Duan J. A., Zhu X. X., et al. (2016). Metabolomics and its application to the evaluation of the efficacy and toxicity of traditional Chinese herb medicines. J. Chromatogr. B Analyt Technol. Biomed. Life Sci. 1026, 204–216. 10.1016/j.jchromb.2015.10.014 [DOI] [PubMed] [Google Scholar]
  126. Shi X., Verma S., Yun J., Brand-Arzamendi K., Singh K. K., Liu X., et al. (2017). Effect of empagliflozin on cardiac biomarkers in a zebrafish model of heart failure: clues to the EMPA-REG OUTCOME trial? Mol. Cell Biochem. 433 (1-2), 97–102. 10.1007/s11010-017-3018-9 [DOI] [PubMed] [Google Scholar]
  127. Sigalas C., Bent S., Kitmitto A., O'Neill S., Sitsapesan R. (2009a). Ca2+-calmodulin can activate and inactivate cardiac ryanodine receptors. Br. J. Pharmacol. 156 (5), 794–806. 10.1111/j.1476-5381.2008.00092.x [DOI] [PMC free article] [PubMed] [Google Scholar]
  128. Sigalas C., Mayo-Martin M. B., Jane D. E., Sitsapesan R. (2009b). Ca2+-calmodulin increases RyR2 open probability yet reduces ryanoid association with RyR2. Biophys. J. 97 (7), 1907–1916. 10.1016/j.bpj.2009.07.027 [DOI] [PMC free article] [PubMed] [Google Scholar]
  129. Skála M., Hanousková B., Skálová L., Matoušková P. (2019a). MicroRNAs in the diagnosis and prevention of drug-induced cardiotoxicity. Arch. Toxicol. 93 (1), 1–9. 10.1007/s00204-018-2356-z [DOI] [PubMed] [Google Scholar]
  130. Su T., Tan Y., Tsui M. S., Yi H., Fu X. Q., Li T., et al. (2016). Metabolomics reveals the mechanisms for the cardiotoxicity of Pinelliae Rhizoma and the toxicity-reducing effect of processing. Sci. Rep. 6, 34692. 10.1038/srep34692 [DOI] [PMC free article] [PubMed] [Google Scholar]
  131. Sun B., Li L., Wu S., Zhang Q., Li H., Chen H., et al. (2009). Metabolomic analysis of biofluids from rats treated with Aconitum alkaloids using nuclear magnetic resonance and gas chromatography/time-of-flight mass spectrometry. Anal. Biochem. 395 (2), 125–133. 10.1016/j.ab.2009.08.014 [DOI] [PubMed] [Google Scholar]
  132. Sun G. B., Sun H., Meng X. B., Hu J., Zhang Q., Liu B., et al. (2014). Aconitine-induced Ca2+ overload causes arrhythmia and triggers apoptosis through p38 MAPK signaling pathway in rats. Toxicol. Appl. Pharmacol. 279 (1), 8–22. 10.1016/j.taap.2014.05.005 [DOI] [PubMed] [Google Scholar]
  133. Sun H., Liu X., Xiong Q., Shikano S., Li M. (2006). Chronic inhibition of cardiac Kir2.1 and HERG potassium channels by celastrol with dual effects on both ion conductivity and protein trafficking. J. Biol. Chem. 281 (9), 5877–5884. 10.1074/jbc.M600072200 [DOI] [PubMed] [Google Scholar]
  134. Sun P., Wu F., Wen M., Yang X., Wang C., Li Y., et al. (2015). A distinct three-helix centipede toxin SSD609 inhibits I(ks) channels by interacting with the KCNE1 auxiliary subunit. Sci. Rep. 5, 13399. 10.1038/srep13399 [DOI] [PMC free article] [PubMed] [Google Scholar]
  135. Tak S., Lakhotia M., Gupta A., Sagar A., Bohra G., Bajari R. (2016). Aconite poisoning with arrhythmia and shock. Indian Heart J. 68 (Suppl. 2), S207–S209. 10.1016/j.ihj.2015.08.010 [DOI] [PMC free article] [PubMed] [Google Scholar]
  136. Titov D. V., Gilman B., He Q. L., Bhat S., Low W. K., Dang Y., et al. (2011). XPB, a subunit of TFIIH, is a target of the natural product triptolide. Nat. Chem. Biol. 7 (3), 182–188. 10.1038/nchembio.522 [DOI] [PMC free article] [PubMed] [Google Scholar]
  137. Tochinai R., Suzuki K., Nagata Y., Ando M., Hata C., Komatsu K., et al. (2014). Cardiotoxic changes of colchicine intoxication in rats: electrocardiographic, histopathological and blood chemical analysis. J. Toxicol. Pathol. 27 (3-4), 223–230. 10.1293/tox.2014-0013 [DOI] [PMC free article] [PubMed] [Google Scholar]
  138. Varghese M. V., Abhilash M., Alex M., Paul M. V. S., Prathapan A., Raghu K. G., et al. (2017). Attenuation of arsenic trioxide induced cardiotoxicity through flaxseed oil in experimental rats. Redox Rep. 22 (6), 346–352. 10.1080/13510002.2017.1289313 [DOI] [PMC free article] [PubMed] [Google Scholar]
  139. Vineetha R. C., Binu P., Arathi P., Nair R. H. (2018). L-ascorbic acid and α-tocopherol attenuate arsenic trioxide-induced toxicity in H9c2 cardiomyocytes by the activation of Nrf2 and Bcl2 transcription factors. Toxicol. Mech. Methods 28 (5), 353–360. 10.1080/15376516.2017.1422578 [DOI] [PubMed] [Google Scholar]
  140. Vineetha V. P., Soumya R. S., Raghu K. G. (2015). Phloretin ameliorates arsenic trioxide induced mitochondrial dysfunction in H9c2 cardiomyoblasts mediated via alterations in membrane permeability and ETC complexes. Eur. J. Pharmacol. 754, 162–172. 10.1016/j.ejphar.2015.02.036 [DOI] [PubMed] [Google Scholar]
  141. Wang H. Y., Zuo A. X., Sun Y., Rao G. X. (2014a). Chemical constituents from aerial part of Aconitum brachypodum. Zhong Yao Cai 37 (8), 1391–1395. 10.13863/j.issn1001-4454.2014.08.021 [DOI] [PubMed] [Google Scholar]
  142. Wang J., Wang N. N., Ge Y. X., Tan H.-L., Ma Z.-C., Wang Y.-G., et al. (2019a). Ophiopogonin D protects cardiomyocytes against ophiopogonin D′-induced injury through suppressing endoplasmic reticulum stress. China J. Chin. Mater. Med. 44 (9), 1876–1881. 10.19540/j.cnki.cjcmm.20190102.003 [DOI] [PubMed] [Google Scholar]
  143. Wang M., Sun G. B., Sun X., Wang H. W., Meng X. B., Qin M., et al. (2013). Cardioprotective effect of salvianolic acid B against arsenic trioxide-induced injury in cardiac H9c2 cells via the PI3K/Akt signal pathway. Toxicol. Lett. 216 (2-3), 100–107. 10.1016/j.toxlet.2012.11.023 [DOI] [PubMed] [Google Scholar]
  144. Wang R., Wang M., Wang S., Yang K., Zhou P., Xie X., et al. (2019b). An integrated characterization of contractile, electrophysiological, and structural cardiotoxicity of Sophora tonkinensis Gapnep. in human pluripotent stem cell-derived cardiomyocytes. Stem Cell Res. Ther. 10 (1), 20. 10.1186/s13287-018-1126-4 [DOI] [PMC free article] [PubMed] [Google Scholar]
  145. Wang S. F., Liu K. C., Wang X. M., He Q. X., Han L. W., Hou H. R. (2009). Preliminary study on cardiotoxicity of celastrol to zebrafish embryo. Chin. Pharmacol. Bull. 25 (5), 634–636. [Google Scholar]
  146. Wang S. R., Chen X., Ling S., Ni R. Z., Guo H., Xu J. W. (2019c). MicroRNA expression, targeting, release dynamics and early-warning biomarkers in acute cardiotoxicity induced by triptolide in rats. Biomed. Pharmacother. 111, 1467–1477. 10.1016/j.biopha.2018.12.109 [DOI] [PubMed] [Google Scholar]
  147. Wang S., Chen X., Ling S., Guo H., Ni R., Dang Y., et al. (2016a). The preliminary study of biomarkers in plasma caused by Tripterygium and aconite's acute toxicity. Lishizhen Med. Mater. Med. Res. 27 (3), 759–761. 10.3969/j.issn.1008-0805.2016.03.093 [DOI] [Google Scholar]
  148. Wang S. Y., Tikhonov D. B., Mitchell J., Zhorov B. S., Wang G. K. (2007). Irreversible block of cardiac mutant Na+ channels by batrachotoxin. Channels (Austin) 1 (3), 179–188. 10.4161/chan.4437 [DOI] [PubMed] [Google Scholar]
  149. Wang T., Chen X., Yu J., Du Q., Zhu J., Yang M., et al. (2018). High-throughput electrophysiology screen revealed cardiotoxicity of strychnine by selectively targeting hERG channel. Am. J. Chin. Med. 46 (8), 1825–1840. 10.1142/s0192415x1850091x [DOI] [PubMed] [Google Scholar]
  150. Wang W., Yang Y., Xiong Z., Kong J., Fu X., Shen F., et al. (2016b). Inhibition of glycogen synthase kinase 3beta ameliorates triptolide-induced acute cardiac injury by desensitizing mitochondrial permeability transition. Toxicol. Appl. Pharmacol. 313, 195–203. 10.1016/j.taap.2016.10.007 [DOI] [PubMed] [Google Scholar]
  151. Wang X., Wang H., Zhang A., Lu X., Sun H., Dong H., et al. (2012). Metabolomics study on the toxicity of aconite root and its processed products using ultraperformance liquid-chromatography/electrospray-ionization synapt high-definition mass spectrometry coupled with pattern recognition approach and ingenuity pathways analysis. J. Proteome Res. 11 (2), 1284–1301. 10.1021/pr200963e [DOI] [PubMed] [Google Scholar]
  152. Wang Y., Guo Z., Huang L. (2014b). Value of different biochemical markers in early diagnosis of acute myocardial infarction. Nan Fang Yi Ke Da Xue Xue Bao 34 (9), 1347–1350. [PubMed] [Google Scholar]
  153. Wang Y. J., Chen B. S., Lin M. W., Lin A. A., Peng H., Sung R. J., et al. (2008). Time-dependent block of ultrarapid-delayed rectifier K+ currents by aconitine, a potent cardiotoxin, in heart-derived H9c2 myoblasts and in neonatal rat ventricular myocytes. Toxicol. Sci. 106 (2), 454–463. 10.1093/toxsci/kfn189 [DOI] [PubMed] [Google Scholar]
  154. Wang Z. G., Ren J. (2002). Current status and future direction of Chinese herbal medicine. Trends Pharmacol. Sci. 23, 347–348. 10.1016/s0165-6147(02)02051-5 [DOI] [PubMed] [Google Scholar]
  155. Watanabe M., Funakoshi T., Unuma K., Aki T., Uemura K. (2014). Activation of the ubiquitin-proteasome system against arsenic trioxide cardiotoxicity involves ubiquitin ligase Parkin for mitochondrial homeostasis. Toxicology 322, 43–50. 10.1016/j.tox.2014.04.008 [DOI] [PubMed] [Google Scholar]
  156. Webster K. A. (2012). Mitochondrial membrane permeabilization and cell death during myocardial infarction: roles of calcium and reactive oxygen species. Future Cardiol. 8 (6), 863–884. 10.2217/fca.12.58 [DOI] [PMC free article] [PubMed] [Google Scholar]
  157. Wright S. N. (2001). Irreversible block of human heart (hH1) sodium channels by the plant alkaloid lappaconitine. Mol. Pharmacol. 59 (2), 183–192. 10.1124/mol.59.2.183 [DOI] [PubMed] [Google Scholar]
  158. Wu J., Wang X., Chung Y. Y., Koh C. H., Liu Z., Guo H., et al. (2017). L-type calcium channel inhibition contributes to the proarrhythmic effects of aconitine in human cardiomyocytes. PLoS One 12 (1), e0168435. 10.1371/journal.pone.0168435 [DOI] [PMC free article] [PubMed] [Google Scholar]
  159. Xi Y., Wang W., Wang L., Pan J., Cheng Y., Shen F., et al. (2018). Triptolide induces p53-dependent cardiotoxicity through mitochondrial membrane permeabilization in cardiomyocytes. Toxicol. Appl. Pharmacol. 355, 269–285. 10.1016/j.taap.2018.07.011 [DOI] [PubMed] [Google Scholar]
  160. Xi Y., Zhang Y., Pan J., Chen S., Lu S., Shen F., et al. (2020). Triptolide dysregulates glucose uptake via inhibition of IKKβ-NF-κB pathway by p53 activation in cardiomyocytes. Toxicol. Lett. 318, 1–11. 10.1016/j.toxlet.2019.10.001 [DOI] [PubMed] [Google Scholar]
  161. Xie J. T., Maleckar S. A., Yuan C. S. (2002). Resibufogenin, a single compound isolated from toad venom, can induce cardiac toxicity. Herbals Complement. Med. 3 (1), 24–28. [Google Scholar]
  162. Xie S., Jia Y., Liu A., Dai R., Huang L. (2015). Hypaconitine-induced QT prolongation mediated through inhibition of KCNH2 (hERG) potassium channels in conscious dogs. J. Ethnopharmacol. 166, 375–379. 10.1016/j.jep.2015.03.023 [DOI] [PubMed] [Google Scholar]
  163. Xu C. B., Wang L., Hui X. J., Ma X. P., Bi X., Zhao Q. (2014). Genetic toxicity of berberine on mouse heart. Amr 884-885, 634–637. 10.4028/www.scientific.net/amr.884-885.634 [DOI] [Google Scholar]
  164. Xu C. Q., Brône B., Wicher D., Bozkurt O., Lu W. Y., Huys I., et al. (2004a). BmBKTx1, a novel Ca2+-activated K+ channel blocker purified from the Asian scorpion Buthus martensi Karsch. J. Biol. Chem. 279 (33), 34562–34569. 10.1074/jbc.M312798200 [DOI] [PubMed] [Google Scholar]
  165. Xu C. Q., He L. L., Brône B., Martin-Eauclaire M. F., Van Kerkhove E., Zhou Z., et al. (2004b). A novel scorpion toxin blocking small conductance Ca2+ activated K+ channel. Toxicon 43 (8), 961–971. 10.1016/j.toxicon.2004.01.018 [DOI] [PubMed] [Google Scholar]
  166. Yan M., Feng L., Shi Y., Wang J., Liu Y., Li F., et al. (2017). Mechanism of As2O3-induced action potential prolongation and using hiPS-CMs to evaluate the rescue efficacy of drugs with different rescue mechanism. Toxicol. Sci. 158 (2), 379–390. 10.1093/toxsci/kfx098 [DOI] [PubMed] [Google Scholar]
  167. Yan M., Zhang K., Shi Y., Feng L., Lv L., Li B. (2015). Mechanism and pharmacological rescue of berberine-induced hERG channel deficiency. Drug Des. Devel Ther. 9, 5737–5747. 10.2147/DDDT.S91561 [DOI] [PMC free article] [PubMed] [Google Scholar]
  168. Yang A. W., Fan X. M., Li X., Liang Q. L., Wang Y. M., Luo G. A. (2011a). Acute toxicity of Venenum Bufonis and compatibility of heart musk protecting pills by microarray expression analysis. Chem. J. Chin. Univ. 32 (5), 1058–1064. [Google Scholar]
  169. Yang W., Ma L., Li S., Cui K., Lei L., Ye Z. (2017). Evaluation of the cardiotoxicity of evodiamine in vitro and in vivo. Molecules 22 (6), 943. 10.3390/molecules22060943 [DOI] [PMC free article] [PubMed] [Google Scholar]
  170. Yang Y., Wang W., Xiong Z., Kong J., Wang L., Qiu Y., et al. (2016). Resveratrol protects against triptolide-induced cardiotoxicity through SIRT3 signaling pathway in vivo and in vitro . Pharmazie 71 (9), 514–523. 10.1691/ph.2016.6597 [DOI] [PubMed] [Google Scholar]
  171. Yang Y. X., Tao M., Ma J. H., Dong X. P., Tan Y. Z. (2011b). Advances in studies on diterpenoids toxic compounds from rhododendrons. Asia Pac. Tradi Med. 7 (7), 168–170. [Google Scholar]
  172. Yao J., Chen X., Li H., Zhou Y., Yao L., Wu G., et al. (2005). BmP09, a “long chain” scorpion peptide blocker of BK channels. J. Biol. Chem. 280 (15), 14819–14828. 10.1074/jbc.M412735200 [DOI] [PubMed] [Google Scholar]
  173. Yao Y. X. (2013). “Cirulating miRs provide dynamic evaluation of myocardial injury and early warning for perioperative myocardial infarction,” Doctor, Chinese academy of medical sciences. Beijing, China: Peking Union Medical College. [Google Scholar]
  174. Yi M., Peng W., Chen X., Wang J., Chen Y. (2012). Effect of hypaconitine combined with liquiritin on the expression of calmodulin and connexin43 in rat cardiac muscle in vivo . J. Pharm. Pharmacol. 64 (11), 1654–1658. 10.1111/j.2042-7158.2012.01532.x [DOI] [PubMed] [Google Scholar]
  175. You J. E. (2016). Carditotoxicity study of Asarum in SD rats on pharmacology and NMR metabolomics. Master thesis. Wuhan, China: Hubei University of Chinese Medicine. [Google Scholar]
  176. Yuan C., Luo Z., Zhou Y., Lei S., Xu C., Peng C., et al. (2018). Removal of hERG potassium channel affinity through introduction of an oxygen atom: molecular insights from structure-activity relationships of strychnine and its analogs. Toxicol. Appl. Pharmacol. 360, 109–119. 10.1016/j.taap.2018.09.042 [DOI] [PubMed] [Google Scholar]
  177. Zhang J. Y., Sun G. B., Wang M., Liao P., Du Y. Y., Yang K., et al. (2016a). Arsenic trioxide triggered calcium homeostasis imbalance and induced endoplasmic reticulum stress-mediated apoptosis in adult rat ventricular myocytes. Toxicol. Res. (Camb) 5 (2), 682–688. 10.1039/c5tx00463b [DOI] [PMC free article] [PubMed] [Google Scholar]
  178. Zhang J. Y., Wang M., Wang R. Y., Sun X., Du Y. Y., Ye J. X., et al. (2018a). Salvianolic acid A ameliorates arsenic trioxide-induced cardiotoxicity through decreasing cardiac mitochondrial injury and promotes its anticancer activity. Front. Pharmacol. 9, 487. 10.3389/fphar.2018.00487 [DOI] [PMC free article] [PubMed] [Google Scholar]
  179. Zhang J. Y., Zhang B., Wang M., Wang W., Liao P., Sun G. B., et al. (2017). Calcium homeostasis and endoplasmic reticulum stress are involved in Salvianolic acid B-offered protection against cardiac toxicity of arsenic trioxide. Oncotarget 8 (57), 97384–97393. 10.18632/oncotarget.22127 [DOI] [PMC free article] [PubMed] [Google Scholar]
  180. Zhang K., Zhi D., Huang T., Gong Y., Yan M., Liu C., et al. (2014). Berberine induces hERG channel deficiency through trafficking inhibition. Cell Physiol. Biochem. 34 (3), 691–702. 10.1159/000363034 [DOI] [PubMed] [Google Scholar]
  181. Zhang M. Y., Yu Y. Y., Wang S. F., Zhang Q., Wu H. W., Wei J. Y., et al. (2018b). Cardiotoxicity evaluation of nine alkaloids from Rhizoma Coptis. Hum. Exp. Toxicol. 37 (2), 185–195. 10.1177/0960327117695633 [DOI] [PubMed] [Google Scholar]
  182. Zhang W., Guo C., Gao R., Ge M., Zhu Y., Zhang Z. (2013a). The protective role of resveratrol against arsenic trioxide-induced cardiotoxicity. Evid. Based Complement. Alternat Med. 2013, 407839. 10.1155/2013/407839 [DOI] [PMC free article] [PubMed] [Google Scholar]
  183. Zhang X., Zhao B., Dong Y., Dai L., Hu T., Xie X., et al. (2016b). Effects of compatibility of ginsenosides Rb1 and aconitine on ATP enzyme and related ion of myocardial cells in newborn rats. Chin. J. Exper Tradit Med. Formulae 22 (7), 112–115. 10.13422/j.cnki.syfjx.2016070112 [DOI] [Google Scholar]
  184. Zhang Y., Dong Z., Jin L., Zhang K., Zhao X., Fu J., et al. (2013b). Arsenic trioxide-induced hERG K+ channel deficiency can be rescued by matrine and oxymatrine through up-regulating transcription factor Sp1 expression. Biochem. Pharmacol. 85 (1), 59–68. 10.1016/j.bcp.2012.09.002 [DOI] [PubMed] [Google Scholar]
  185. Zhang Z. H., Zhao Y. Y., Cheng X. L., Dai Z., Zhou C., Bai X., et al. (2013c). General toxicity of Pinellia ternata (Thunb.) Berit. in rat: a metabonomic method for profiling of serum metabolic changes. J. Ethnopharmacol 149 (1), 303–310. 10.1016/j.jep.2013.06.039 [DOI] [PubMed] [Google Scholar]
  186. Zhao X., Shi Y. Q., Yan C. C., Feng P. F., Wang X., Zhang R., et al. (2015). Up-regulation of miR-21 and miR-23a Contributes to As2 O3 -induced hERG Channel Deficiency. Basic Clin. Pharmacol. Toxicol. 116 (6), 516–523. 10.1111/bcpt.12348 [DOI] [PubMed] [Google Scholar]
  187. Zheng Q., Bao Y. M. (2017). Regulatory effects of traditional Chinese medicine on autophagy in myocardial ischemia reperfusion injury. Zhongguo Zhong Yao Za Zhi 42 (15), 2925–2929. 10.19540/j.cnki.cjcmm.20170714.010 [DOI] [PubMed] [Google Scholar]
  188. Zhou C., Yu F., Zeng P., Zhang T., Huang H., Chen W., et al. (2019). Circadian sensitivity to the cardiac glycoside oleandrin is associated with diurnal intestinal P-glycoprotein expression. Biochem. Pharmacol. 169, 113622. 10.1016/j.bcp.2019.08.024 [DOI] [PubMed] [Google Scholar]
  189. Zhou J., Xi C., Wang W., Fu X., Jinqiang L., Qiu Y., et al. (2014). Triptolide-induced oxidative stress involved with Nrf2 contribute to cardiomyocyte apoptosis through mitochondrial dependent pathways. Toxicol. Lett. 230 (3), 454–466. 10.1016/j.toxlet.2014.08.017 [DOI] [PubMed] [Google Scholar]
  190. Zhou J., Xi C., Wang W., Yang Y., Qiu Y., Huang Z. (2015). Autophagy plays an important role in triptolide-induced apoptosis in cardiomyocytes. Toxicol. Lett. 236 (3), 168–183. 10.1016/j.toxlet.2015.05.013 [DOI] [PubMed] [Google Scholar]
  191. Zhou W., Qiu L.-z., Liu H., Deng H.-F., Yue L.-X., Gao Y. (2020). Notch1-mediated histone demethylation of HCN4 contributes to aconitine-induced ventricular myocardial dysrhythmia. Toxicol. Lett. 327, 19–31. 10.1016/j.toxlet.2020.03.017 [DOI] [PubMed] [Google Scholar]
  192. Zhou Y. H., Piao X. M., Liu X., Liang H. H., Wang L. M., Xiong X. H., et al. (2013). Arrhythmogenesis toxicity of aconitine is related to intracellular Ca2+ signals. Int. J. Med. Sci. 10 (9), 1242–1249. 10.7150/ijms.6541 [DOI] [PMC free article] [PubMed] [Google Scholar]

Articles from Frontiers in Pharmacology are provided here courtesy of Frontiers Media SA

RESOURCES