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. 2016 Feb 15;13(4):2967–2972. doi: 10.3892/mmr.2016.4889

Sip-jeon-dea-bo-tang, a traditional herbal medicine, ameliorates cisplatin-induced anorexia via the activation of JAK1/STAT3-mediated leptin and IL-6 production in the fat tissue of mice

SANG-MI WOO 1, YOUN KYUNG CHOI 1, AH-JEONG KIM 1, YEE JIN YUN 1, YONG CHEOL SHIN 1, SUNG-GOOK CHO 1,2, SEONG GYU KO 1,✉
PMCID: PMC4805058  PMID: 26936678

Abstract

Despite its therapeutic advantages, chemotherapy can also cause adverse effects, including anorexia and loss of appetite. Although numerous patients with cancer have been reported to suffer from anorexia during or following chemotherapy, treatment options for anorexia remain to be determined. In Asian countries, traditional medicines are widely used to treat problems with appetite; sip-jeon-dea-bo-tang (SJDBT) is one of those medicines used for the treatment of anorexia. The present study demonstrated that SJDBT ameliorated cisplatin-induced anorexia. In a mouse model of chemotherapy-induced anorexia, oral administration of SJDBT prevented the cisplatin-induced reduction of food intake, inhibiting weight loss. The results of multiplex assays showed that SJDBT only altered the levels of interleukin (IL)-6 and leptin in the serum and fat tissue. In addition, SJDBT maintained the serum leptin level and increased the serum IL-6 level, whereas cisplatin reduced the levels of both serum leptin and IL-6. Furthermore, SJDBT was revealed to increase the levels of leptin and IL-6 in the fat tissue by activating the JAK1/STAT3 signaling pathway. In conclusion, the present results revealed that SJDBT ameliorated cisplatin-induced anorexia, suggesting its usefulness in the prevention of anorexia during chemotherapy.

Keywords: Sip-jeon-dea-bo-tang, anorexia, leptin, interleukin-6, JAK1, STAT3

Introduction

It has been reported that ~50% of patients with cancer suffer from anorexia, one of the adverse effects caused by chemotherapy (1–3). Cancer patients with anorexia exhibit symptoms, including loss of appetite, weight loss, chronic fatigue, lethargy and anemia (4,5). When these symptoms become chronic, a loss of fat and muscle is observed, which is closely associated with cachexia (6). Anorexia is a major concern for patients with cancer, since it worsens the quality of life and becomes an obstacle in cancer therapies, often resulting in poor prognosis (7–9). Although certain drugs have been suggested, the therapeutic options for the treatment of anorexia remain to be determined (10,11). Leptin, a hormone secreted predominantly by fat tissue, modulates food intake and energy balance (12–14). Low levels of leptin are often observed in cancer patients with anorexia (13,15), suggesting that balanced leptin levels may be crucial in the prevention of anorexia. Interleukin (IL)-6 regulates leptin production and vice versa (16–19). Furthermore, the deletion of the IL-6 receptor in mice causes a decrease in both food intake and body weight (20). It has been revealed that the Janus kinase (JAK)1/signal transducer and activator of transcription (STAT)3 pathway regulates the production of leptin and IL-6 in the fat tissue (21,22).

Sip-jeon-dea-bo-tang (SJDBT), is a traditional herbal medicine, widely used in the treatment of various diseases, including anorexia, anemia, extreme fatigue and weakness, in Korea, China and Japan (23–26). SJDBT has been revealed to exhibit anticancer effects (27–29). Previously, it was revealed that SJDBT ameliorates cancer-induced anorexia and cachexia (30). In addition, SJDBT has been reported to mitigate various chemotherapy-induced side effects (31–34). Based on the aforementioned findings, SJDBT appears to have multiple roles in the treatment of cancer; however, it remains unclear how SJDBT ameliorates chemotherapy-induced anorexia. In the present study, the effect of SJDBT in cisplatin-induced anorexia in mice was investigated. SJDBT was revealed to ameliorate food intake and body weight by altering the levels of leptin and IL-6. In the fat tissue, SJDBT activated the JAK1/STAT3 signaling pathway, resulting in the production of both leptin and IL-6; therefore, the present data suggested that SJDBT may be useful in the prevention of chemotherapy-induced anorexia.

Materials and methods

Materials

Cisplatin was purchased from Sigma-Aldrich (St. Louis, MO, USA) and SJDBT was obtained from Hanpoong Pharm & Foods Co., Ltd., (Jeonju, Republic of Korea). SJDBT extract was prepared, according to the Good Manufacturing Practices guidelines (35–37). Briefly, 10 of the components comprising SJDBT [Angelica gigas, Astragalus membranaceus, Atractylodes japonica, Cinnamomum cassia, Cnidium officinale, Paeonia lactiflora, Panax ginseng, Poria cocos and Rehmannia glutinosa (320 g each), and Glycyrrhiza uralensis (160 g)] were placed in 10-fold volume of water, boiled at 100°C for 3 h, filtered using 25 µm microfilters, and were subsequently extracted at 60°C. Finally, 876.9 g dried extract was obtained and the average yield was ~28.85%. Megestrol acetate (MA; Megace®) was purchased from Santa Cruz Biotechnology, Inc. (Santa Cruz, CA, USA). Primary polyclonal antibodies against phosphorylated (p-)JAK1, (3331) p-STAT3 (9131), STAT3 (9132), p-AKT (9271) and AKT (9272) were purchased from Cell Signaling Technologies (Danvers, MA, USA). Anti-α-tubulin monoclonal antibody (T-5168) was purchased from Sigma-Aldrich (St. Louis, MO, USA).

Animal study

A total of 42 male Balb/c mice (6-weeks-old) were purchased from Orient Bio Inc. (Seongnam, South Korea) and were maintained at 23±3°C (humidity, 55±15%) with a 12 h light/dark cycle. Water was continuously provided during whole experimental period. Following fasting for 24 h, mice were provided with food for 28 h and food intake was observed at the indicated times (Fig. 1A). Mice were randomly split into three equal groups (n=6/group) as follows: Normal, cisplatin and SJDBT + cisplatin. Water and food were provided enough, and food was changed daily. Food intake was observed daily at the consistent times (Fig 2A). Mice were randomly split into three equal groups (n=6/group) as follows: Normal, cisplatin, SJDBT + cisplatin and MA + cisplatin. Briefly, 8 mg/kg cisplatin dissolved in water was intraperitoneally injected into the mice, followed by daily oral administration of 678.4 mg/kg SJDBT dissolved in water and 100 mg/kg MA dissolved in corn oil. The present animal study was approved by the Animal Ethics Committee of Kyung Hee University [KHUASP (SE)-012-048]. Upon completion of the experiment, mice were anesthetized using 1.2% avertin solution [0.5 g 2,2,2-tribromoethanol powder dissolved into 1 ml 2-methyl-2-butanol at 55°C and 39 ml phosphate-buffered saline (PBS)] through a Nalgene 0.22-µ filter (Thermo Fisher Scientific, Inc., Waltham, MA, USA) (1) and sacrificed via exsanguination.

Figure 1.

Figure 1

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SJDBT prevents the cisplatin-induced decrease in food intake in mice. (A) The experimental design for accessing the effect of SJDBT on cisplatin-induced anorexia in mice. (B) Food intake and (C) body weight were measured at the indicated time points (*P<0.05). Data are presented as the mean ± standard deviation (n=6 per group). SJDBT, Sip-jeon-dea-bo-tang; N.S., no statistical difference.

Figure 2.

Figure 2

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Long-term administration of SJDBT prevents cisplatin-induced anorexia in mice. (A) The experimental design used to investigate the effect of SJDBT on cisplatin-induced anorexia. Measurements of (B) food intake, (C) body weight and the levels of (D) leptin and (E) IL-6 in the serum of mice were obtained (*P<0.05). Data are presented as the mean ± standard deviation (n=6 per group). SJDBT, Sip-jeon-dea-bo-tang; IL, interleukin; MA, megestrol acetate.

Enzyme-linked immunosorbent assay (ELISA)

In order to obtain the serum, blood was centrifuged at 22.4 × g for 20 min at room temperature and the supernatant was transferred to a new tube. Upon completion of the experiment, the levels of IL-6 and leptin in the serum were measured using the Millipore Mouse Metabolic Magnetic Bead Panel kit (EMD Millipore, Billerica, MA, USA), according to the manufacturer's protocol. Next, the levels of mouse IL-6 (BD 555240; BD Biosciences, San Jose, CA, USA) and mouse leptin (DY498; R&D Systems, Inc., Minneapolis, MN, USA) were measured using ELISA kits according to the manufacturer's protocol. All experiments were performed in triplicate.

Western blot analysis

Primary fat tissues were isolated from the mice and were lysed using radioimmunoprecipitation buffer (Biosesang, Scongnam, Korea) to obtain whole protein. Protein concentration was measured using the Bradford assay and 10 µg protein was separated by 8% sodium dodecyl sulfate-polyacrylamide gels electrophoresis. Separated proteins were transferred onto polyvinylidene difluoride membranes (both GE Healthcare Life Sciences, Freiburg, Germany) and the membranes were subsequently blocked in 1% bovine serum albumin (BSA) and 2% skimmed milk for 1 h. Following incubation at 4°C overnight with the following primary polyclonal antibodies against: p-JAK1, p-STAT3, STAT3, p-AKT, AKT (all 1:1,000) and monoclonal anti-α-tubulin (1:100,000 in 3% BSA), the membranes were incubated at room temperature for 1 h with horseradish peroxidase-conjugated goat anti-rabbit immunglobulin G (H+L) secondary antibody (KPL, Inc., Gaithersburg, MA, USA). The membranes were washed three times in PBS with 0.01% Tween-20 between each step. In order to visualize the membranes, enhanced chemiluminescence (ECL) kit solution (DoGen, Seoul, Korea) was used and the membranes were exposed to X-ray film (AGFA Healthcare, Mortsel, Belgium).

Statistical analysis

Statistical differences were calculated via Student's t-test using Microsoft Excel 2007 (Microsoft Corporation, Redmond, WA, USA). Data were presented as the mean ± standard deviation. P<0.05 was considered to indicate a statistically significant difference.

Results

SJDBT prevents a cisplatin-mediated decrease in food intake

The effect of SJDBT on the food intake of mice treated with cisplatin was investigated. The mice were initially subjected to an oral administration of SJDBT or water, and subsequently to an intraperitoneal injection of cisplatin (Fig. 1A). By contrast to the cisplatin-treated mice previously described (34,38), in which a decrease in food intake was observed, the mice treated with SJDBT + cisplatin did not exhibit the same cisplatin-induced decrease (Fig. 1B). In addition, no body weight loss was observed in any of the mice in this experiment (Fig. 1C); therefore, the present data indicated that SJDBT prevented a cisplatin-induced decrease in food intake in mice.

Long-term treatment of SJDBT ameliorates cisplatin-induced anorexia

The present study next examined whether long-term treatment with SJDBT is effective in cisplatin-induced anorexic mice. Three days following cisplatin treatment, the mice received oral administration of water, SJDBT or MA, every day for 14 days. Food and water were changed daily, and the food intake and body weight were measured daily (Fig. 2A). Food intake and body weight were markedly reduced 3 days following cisplatin treatment (Fig. 2B and C), confirming the success of the mouse model of chemotherapy-induced anorexia. SJDBT was shown to markedly restore the cisplatin-induced decrease in food intake, and recover the body weight of the mice (Fig. 2B and C). Subsequently, the serum levels of leptin and IL-6, which are considered markers for anorexia, were measured. It was revealed that cisplatin reduced the levels of serum leptin and IL-6, consistent with previous studies (39,40), whereas SJDBT was shown to restore them (Fig. 2D), suggesting that long-term treatment with SJDBT may prove useful in the treatment of cisplatin-induced anorexia.

SJDBT increases the levels of leptin and IL-6

Since leptin and IL-6 are considered as markers for anorexia, their serum and fat levels were measured in the mice from the previous experiment. Cisplatin was revealed to reduce the serum level of leptin, whereas SJDBT was shown to slightly increase the levels of leptin (Fig. 3A). Furthermore, SJDBT significantly rescued the cisplatin-mediated reduction in the level of leptin in the fat (Fig. 3B). Similarly, SJDBT increased the IL-6 levels in the serum (Fig. 3C) and fat tissues (Fig. 3D); therefore, the present data suggested that SJDBT may ameliorate cisplatin-induced anorexia via the regulation of the leptin and IL-6 levels in the fat tissue.

Figure 3.

Figure 3

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SJDBT increases the levels of leptin and IL-6 in the serum and fat of mice. An enzyme-linked immunosorbent assay was used to measure the leptin levels in the (A) serum and (B) fat tissue of mice and IL-6 levels in the (C) serum and (D) fat tissue of mice (*P<0.05). Data are presented as the mean ± standard deviation (n=6 per group). SJDBT, Sip-jeon-dea-bo-tang; IL, interleukin.

SJDBT increases the levels of leptin and IL-6 via the activation the JAK/STAT3 signaling pathway in the fat tissues of mice

The JAK1/2-STAT3 signaling pathway has been shown to regulate both IL-6 and leptin production (16,17). Fat tissues were isolated and were subsequently used for western blotting. This revealed that SJDBT regulated the phosphorylation of both JAK1 and STAT3, but not AKT (Fig. 4A). The present data therefore suggested that the SJDBT-mediated treatment of anorexia occurs as a result of the JAK1/STAT3-mediated production of leptin and IL-6 in the fat of mice.

Figure 4.

Figure 4

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SJDBT activates JAK1 and STAT3 in the fat tissue of mice. (A) Western blot analysis of protein samples from the fat tissues of three different mice in the same groups were loaded. Tubulin was used as a loading control. (B) A schematic model summarizing the effect of SJDBT on cisplatin-induced anorexia. SJDBT promotes the production of IL-6 and leptin by activating the JAK1/STAT3-mediated signaling pathway in the fat of mice, resulting in the prevention of cisplatin-induced anorexia. SJDBT, Sip-jeon-dea-bo-tang; IL, interleukin; p-, phosphorylated; JAK, Janus kinase; STAT, signal transducer and activator of transcription; AKT, protein kinase B.

Discussion

SJDBT has been reported to ameliorate chemotherapy-mediated side effects in mice and cancer patients (26,31,33,41); however, its protective role against chemotherapy-induced anorexia remains to be elucidated. In the present study, it was found that SJDBT prevented the cisplatin-induced decrease in food intake and body weights in mice via the regulation of the JAK1/STAT3-mediated production of leptin and IL-6 in the fat tissue of mice (21,22).

Our previous study revealed that SJDBT regulated various cytokines and hormones involved in appetite, including IL-6, monocyte chemoattractant protein-1, peptide YY and glucagon-like peptide-1, and ameliorated cancer-induced anemia (30). In addition, SJDBT has been shown to protect immune defects in patients with cancer undergoing chemotherapy (31–33,41). The regulation of cytokine production by SJDBT appears to have unique therapeutic effects; however, its role against anorexia remains to be elucidated. In the present study, it was found that SJDBT restored decreased food intake levels and the decreased body weight induced by cisplatin. Furthermore, SJDBT regulated the production of IL-6 and leptin.

In our previous study, SJDBT failed to regulate the level of leptin in tumor-bearing mice (30), which suggests that the regulation of leptin by SJDBT appears to be limited to cisplatin-induced anorexia. In addition, the data from multiplex assays revealed that SJDBT did not markedly alter various cytokines and hormones, including ghrelin, in both cisplatin-induced and cancer-associated anorexia mouse models (data not shown). Therefore, SJDBT regulation of IL-6 production seems to be unique in experimental systems reflecting either chemotherapy-induced or cancer-associated anorexia. IL-6 is known to regulate anorexia and cachexia, which is crucial for the improvement of the survival rates of patients with cancer (42). IL-6 is also known to activates the JAK/STAT signaling pathway, resulting in an increase in IL-6 production (43,44). In the present study, SJDBT activated JAK1 and STAT3, but not AKT, suggesting that SJDBT regulates food intake by activating JAK1/STAT3-mediated IL-6 production.

It remains unknown which compounds in SJDBT are effective and what their effects are in cells, tissues and organs, which comprises a major challenge for studies on herbal medicines. With regard to SJDBT, high performance liquid chromatography fingerprint analysis was performed (45), thereby providing hints for effective components.

Numerous patients from countries in East Asia receive SJDBT for the treatment of certain diseases, including various cancers, anorexia, cachexia, chronic fatigue, immunization disease, female disorder and blood-flow disorders, despite the lack of scientific evidence regarding the role of SJDBT in these diseases. The aim of the present study was therefore to obtain a deeper understanding of the role of SJDBT against cisplatin-induced anorexia in mice. The collected data suggested that SJDBT may be useful in the treatment of anorexia in patients with cancer undergoing chemotherapy.

It was demonstrated that SJDBT prevents cisplatin-induced anorexia in mice by regulating the JAK1/STAT3-mediated production of IL-6 and leptin, therefore suggesting that SJDBT ameliorates chemotherapy-induced anorexia.

Acknowledgments

The present study was supported by a grant from the Korean Medicine R&D project of the Ministry of Health and Welfare (no. B120014) and by the National Research Foundation of Korea, which is funded by the Ministry of Science (grant no. 2007-0054931).

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