Abstract
MicroRNAs (miRs) can affect the progression of cervical cancer (CC). The present study investigated the function of miR-145-5p in CC and demonstrated its association with fascin (FSCN1). The expression levels of miR-145-5p in CC tissues and cell lines were analyzed using reverse transcription-quantitative PCR, and its direct targets were explored using a luciferase reporter assay. The viability, migration and invasion of HeLa cells transfected with small interfering FSCN1 or with miR-145-5p mimics and inhibitors were analyzed using Cell Counting Kit-8 and Transwell assays. The expression levels of FSCN1 mRNA and protein were investigated using reverse transcription PCR and western blotting. miR-145-5p was downregulated in CC tissues and cell lines. Moreover, overexpression of miR-145-5p inhibited the migration, invasion and viability of HeLa cells. miR-145-5p directly targeted FSCN1, which regulated the suppressive functions of miR-145-5p in CC cells. Overall, miR-145-5p is a tumor suppressor gene and a promising target for CC treatment.
Keywords: cervical cancer, microRNA-145-5p, fascin, migration, invasion
Introduction
Cervical cancer (CC), is one of the most common gynecological malignancies in females and has a high death rate worldwide (1). Each year, >270,000 females die as a result of cervical cancer, of which 53,000 are located in China (2). CC originates either from cervical intraepithelial neoplasia (CIN) or squamous intraepithelial lesions (3). Recently, the occurrence rates of CC have decreased due to novel screening, diagnostic and treatment techniques (4). However, a high number of females still develop and die from this disease every year (5). Hence, new therapeutic strategies and molecular diagnostic biomarkers for CC are required. MicroRNAs (miRNAs/miRs) are a group of non-coding RNAs that are ~22 nucleotides long, and can inhibit mRNA translation or catalyze mRNA cleavage to block the expression of target mRNAs (6). Therefore, miRNAs have become an area of interest in oncology research in recent years. Key events in the development of CC may involve the loss or acquired function of certain miRNAs (7). miR-145, a tumor suppressor in various types of cancer, is abnormally expressed in gastric, ovarian, breast, prostate and lung cancer (8–11). miR-145 overexpression can suppress human colon cancer SW620 cells (12). miR-145 regulates the biological function of tumor cells by regulating the expression levels of numerous downstream genes (13); to the best of our knowledge, however, there are no studies about the function of miR-145 in cervical cancer. Fascin-1 (FSCN1) is an actin-binding protein which is present in mesenchymal tissues, however, its expression levels are limited in adult epithelial cells (14). In the physiological and tumor environment, fascin proteins stabilize the formation of parallel actin bundles in cell protrusions, which represent the initial stage of cell migration (15). FSCN1, a direct target of miR-145 in esophageal cancer (16), is involved in a number of cancer processes in vivo (17). For example, FSCN1 suppresses epithelial mesenchymal transition (EMT) in human ovarian cancer cells (18). FSCN1 also suppresses tumors in gastric cancer (19). Moreover, miR-145 can inactivate CC cells by targeting FSCN1 (20). However, the molecular mechanisms underpinning the functions of miR-145-5p in CC are not clear.
The present study aimed to investigate the functional roles and molecular mechanisms of miR-145-5p in CC and to reveal the association between miR-145-5p and FSCN1 in CC.
Materials and methods
Tissue collection and cell culture
In total, 40 paired adjacent tissues (located 0.5 cm from the cancer lesions) and CC tissues were acquired from the First Affiliated Hospital of Nanchang University and were stored in liquid nitrogen prior to use. All patients provided written informed consent to participate.
ECT1/E6E7, HeLa and C33a cell lines were obtained from the Cell Bank of Type Culture Collection of the Chinese Academy of Sciences. These cells were incubated in DMEM (Gibco; Thermo Fisher Scientific, Inc.) and 10% FBS (Gibco; Thermo Fisher Scientific, Inc.), penicillin (100 units/ml) and streptomycin (100 µg/ml) at 37°C and 5% CO2. Approval was obtained from the Ethics Committee of the First Affiliated Hospital of Nanchang University.
Cell transfection
miR-145-5p mimics or inhibitors (100 nM) and FSCN1 small interfering (si)RNA (50 nM) (GenePharma Co., Ltd.) were transfected into HeLa cells cultured in 6-well plates (Corning, Inc.) at 75% confluence using Lipofectamine 3000® reagent (Invitrogen; Thermo Fisher Scientific, Inc.) at 37°C for 24 h based on the manufacturers' instructions. The sequences of siRNAs, mimics, inhibitors and controls are as follows: FSCN1 siRNA sense, 5′-GCUGCUACUUUGACAUCGATT-3′ and antisense, 5′-UCGAUGUCAAAGUAGCAGCTT-3′; scrambled siRNA sense, 5′-AUAUUCCUGCGAUAGCUCGTT-3′ and antisense, 5′-CGAGCUAUCGCAGGAAUAUTT-3′; miR-145-5p mimics sense, 5′-GUCCAGUUUUCCCAGGAAUCCCU-3′ and antisense, 5′-GGAUUCCUGGGAAAACUGGACUU-3′; miR-145-5p mimics control sense 5′-UUCUCCGAACGUGUCACGUTT-3′ and antisense, 5′-ACGUGACACGUUCGGAGAATT-3′; miR-145-5p inhibitors sense, 5′-AGGGAUUCCUGGGAAAACUGGAC-3′ and miR-145-5p inhibitors control sense, 5′-CAGUACUUUUGUGUAGUACAA-3′.
RNA extraction and RT-qPCR
Total RNA from miR-145-5p mimics or inhibitors and FSCN1 siRNA-transfected HeLa cells was isolated using TRIzol® reagent (Invitrogen; Thermo Fisher Scientific, Inc.). Total RNA content was quantified spectrophotometrically, then cDNA was prepared with a RT kit (cat. no. RR037A; Takara Biotechnology Co., Ltd.) at 37°C for 15 min according to the manufacturer's instructions. miR-145-5p and FSCN1 expression levels were measured using reverse transcription-quantitative PCR (RT-qPCR) using an ABI PRISM 7500 sequence detection system (Thermo Fisher Scientific, Inc.) and SYBR Premix Ex Taq Master Mix (Takara Bio, Inc.). U6 and GAPDH were used as internal controls. The following primer pairs (Invitrogen; Thermo Fisher Scientific, Inc.) were used for the qPCR: miR-145-5p forward, 5′-GUCCAGUUUUCCCAGGAAUCCCU-3′ and reverse, 5′-GGAUUCCUGGGAAAACGUGACUU-3′; U6 forward, 5′-CCCTGGCACCCAGCAC-3′ and reverse, 5′-GCCGATCCACACGGAGTAC-3′; FSCN1 forward, 5′-GGAGACCGACCAGGAGAC-3′ and reverse, 5′-GATTGGACGCCCTCAGTG-3′ and GAPDH forward, 5′-CAATGACCCCTTCATTGACC-3′ and reverse, 5′-GACAAGCTTCCCGTTCTCAG-3′. A total of 0.5 µl cDNA, 0.5 µl forward primer, 0.5 µl reverse primer, 2 µl deoxyribonucleotide triphosphate mixture (2.5 mM), 0.5 µl DNA polymerase (10 U/µl), 6 µl 5X buffer and 15 µl ddH2O were subjected to 38 cycles at 95°C for 5 min, 95°C for 15 sec and 56°C for 30 sec. miR-145-5p and FSCN1 expression were analyzed using the 2−ΔΔCq method (21).
Luciferase reporter assay
The 3′-untranslated region (3′-UTR) of FSCN1 was located using TargetScan (targetscan.org/vert_71/) was cloned into a pGL4-empty vector (Promega Corporation). HeLa cells were cultured in a 96-well plate (2×104 cells/well) and co-transfected with miR-145-5p mimics, inhibitors or negative control and the 3′-UTR vector using Lipofectamine® 3000 (Invitrogen; Thermo Fisher Scientific, Inc.) with Opti-MEM (Thermo Fisher Scientific, Inc.). Subsequently, a mutant (Mut) 3′-UTR plasmid was generated at the binding sites for miR-145-5p (Promega Corporation). After 24 h of culture, the cells were lysed in radioimmunoprecipitation assay buffer with protease inhibitor cocktail (Roche Diagnostics Shanghai Co., Ltd.), and luciferase activity was detected using a dual luciferase reporter assay kit (Promega Corporation). Firefly luciferase activity was standardized to that of Renilla.
Cell Counting Kit (CCK)-8 assay
The growth of HeLa cells was analyzed using a CCK-8 assay (cat. no. C0038; Beyotime Institute of Biotechnology.). In brief, cells in 24-well plates were cultured for 24 h and transfected with miR-145-5p mimics and inhibitors. Subsequently, transfected cells (100 µl, 1×105 cells/well) and CCK-8 solution (10 µl/well) were added to 96-well plates for 2 h of culture at 37°C. Viable cells were measured with an Epoch microplate absorbance tester (BioTek Instruments, Inc.) at a wavelength of 450 nm.
Migration and invasion assays
The migration and invasion of HeLa and ECT1/E6E7 cells were analyzed using Transwell chambers with 8.0-µm pore size (Corning, Inc.). In brief, 1×105 transfected cells without FBS were seeded in the uncoated top chamber, and their migration or invasion was initiated by adding 20% FBS to the lower chamber for 24 h. Meanwhile, transfected cells (1×105) were seeded into a chamber with an 8-µm pore size pre-coated with BD Matrigel™ Basement Membrane Matrix (BD Biosciences) and placed in a 24-well plate for 24 h. These cells, along with the coated membranes, were then placed in the upper chamber and cultured for migration and invasion assays. These cells were dyed with 0.2% crystal violet for 15 min at 37°C (Beyotime Institute of Biotechnology) and washed with PBS. Images were captured and counted under an upright microscope (magnification, ×40).
Western blotting
Total proteins were obtained using radioimmunoprecipitation assay buffer (cat. no. 89900; Invitrogen; Thermo Fisher Scientific, Inc.), and determined using a bicinchoninic acid kit (cat. no., P0010; Beyotime Institute of Biotechnology). Proteins (50 µg) were separated using 10% SDS-PAGE. After membranes were blocked with 5% non-fat milk at 37°C for 1 h, the membranes were incubated with primary antibodies against FSCN1 (1:1,200; cat. no. ab220195; Abcam) and GAPDH (1:2,000; cat. no: ab181602; Abcam), followed by HRP-conjugated goat anti-mouse IgG secondary antibody (1:2,000; cat. no. ab97040; Abcam) overnight at 4°C. Finally, bands were visualized using a FluorChem imaging device (ProteinSimple). Band intensities were analyzed using ImageJ (version 1.45; National Institutes of Health).
Statistical analysis
All data were analyzed using SPSS 16.0 (SPSS, Inc.) or GraphPad Prism 5.0 (GraphPad Software, Inc.). χ2 or Fisher's exact tests were used to compare categorical variables as appropriate. Student's t-test, Mann-Whitney U test and one-way ANOVA with Tukey's post hoc test were used to compare continuous data. Results were expressed as mean ± SEM. P<0.05 was considered to indicate a statistically significant difference.
Results
Patient characteristics
The expression of miR-145-5p in CC patients with different clinicopathological features are summarized in Table I. miR-145-5p expression in both cancer and adjacent tissues was measured in each patient. The mean values of miR-145 expression levels in CC tissues were used as the cutoff values (0.637). The samples were divided into high and low expression group, and then correlated with the clinicopathological characteristics of the cases. The cancer histology and differentiation data are shown in Table I. There are no significant differences found in clinicopathological factors, including age, tumor size and differentiation grade, between the low miR-145-5p expression group and high miR-145-expression group. However, there was a significant difference in tumor grade and lymph node metastasis between the miR-145-5p high and low expression groups.
Table I.
Association between the expression of miR-145-5p and clinicopathological factors in patients with cervical cancer.
| miR-145-5p expression | ||||
|---|---|---|---|---|
| Variables | Patients (n=40) | Low (n=25) | High (n=15) | P-value |
| Age (years) | 0.874 | |||
| ≤52 | 22 | 14 (56.0) | 8 (53.3) | |
| >52 | 18 | 11 (44.0) | 7 (46.7) | |
| Tumor size (cm) | 0.078 | |||
| ≤2 | 28 | 15 (60.0) | 13 (86.7) | |
| >2 | 12 | 10 (40.0) | 2 (13.3) | |
| Differentiation | 0.108 | |||
| Well | 20 | 15 (60.0) | 5 (33.3) | |
| Moderate, poor | 20 | 10 (40.0) | 10 (66.7) | |
| Tumor grade | 0.002 | |||
| G1 | 17 | 5 (20.0) | 12 (80.0) | |
| G2 + G3 | 23 | 20 (80.0) | 3 (20.0) | |
| Lymph node metastasis | 0.013 | |||
| No | 22 | 10 (40.0) | 12 (80.0) | |
| Yes | 18 | 15 (60.0) | 3 (20.0) | |
miR, microRNA.
miR-145-5p is downregulated but FSCN1 is overexpressed in CC
The clinicopathological results indicated that miR-145-5p expression is lower in patients with CC and associated with lymph node metastasis. Both miR-145-5p and FSCN1 expression in CC tissues and cell lines were analyzed. miR-145-5p expression was significantly lower in CC tissues and HeLa and C33a cells compared with the NC controls (Fig. 1A and B). Simultaneously, FSCN1 expression was significantly higher in CC tissues and HeLa and C33a cells compared with the NC controls (Fig. 1C-F). HeLa is a classic cell line in cervical cancer research and exhibited significant FSCN1 overexpression in the present study. Thus, HeLa cells were used for subsequent experiments. These results demonstrated that both decreased miR-145-5p expression and FSCN1 overexpression occurs in CC.
Figure 1.
miR-145-5p and FSCN1 expression. (A) miR-145-5p expression was significantly lower CC tissues compared with the controls. (B) miR-145-5p expression was significantly downregulated in HeLa and C33a cells compared with ECT1/E6E7 cells. FSCN1 mRNA expression was increased in (C) CC tissues and (D) HeLa and C33a cell lines analyzed using reverse transcription quantitative-PCR. (E and F) FSCN1 protein levels were overexpressed in HeLa and C33a cells analyzed using western blotting. *P<0.05, **P<0.01 and ***P<0.001 vs. adjacent tissues or ECT/E6E7 cells. miR, microRNA; CC, cervical carcinoma; FSCN1, fascin.
miR-145-5p directly targets FSCN1 in vitro
To investigate the effects of miR-145-5p downregulation and FSCN1 overexpression in CC, the probable target genes of miR-145-5p were identified using bioinformatic tests, which included FSCN1 (Fig. 2A). Dual-luciferase reporter assays indicated that miR-145-5p mimics significantly inhibited the luciferase activities of Mut FSCN1, but did not affect those of wild-type FSCN1 (Fig. 2B). Furthermore, transfection of miR-145-5p mimics and inhibitors significantly altered miR-145-5p expression compared with control (Fig. 2C). FSCN1 expression significantly decreased in HeLa cells treated with miR-145-5p mimics compared with control, while FSCN1 expression significantly increased in cells treated with miR-145-5p inhibitor compared with NC control (Fig. 2D-F) at both mRNA and protein levels. These results indicated that miR-145-5p directly targeted FSCN1.
Figure 2.
miR-145-5p directly targets FSCN1 in cervical cancer cells. (A) Binding sites between miR-145-5p and FSCN1. (B) Luciferase activities of Wt-FSCN1 mRNA in HeLa cells. (C) miR-145-5p expression in HeLa cells transfected with miR-145-5p mimics, inhibitors, mimics control or inhibitors control. FSCN1 expression in HeLa cells transfected with miR-145-5p mimics, inhibitors, mimics control or inhibitors control was detected at (D) mRNA and (E and F) protein levels. *P<0.05 vs. NC, **P<0.01 vs. NC and ***P<0.001 vs. NC. miR, microRNA; FSCN1, fascin; Wt, wild-type; Mut, mutant; NC, negative control.
miR-145-5p inhibits the viability, migration and invasion of HeLa cells
The function of miR-145-5p in CC cells was analyzed using Transwell and CCK-8 assays. miR-145-5p overexpression decreased HeLa cell viability, but decreased miR-145-5p expression significantly promoted HeLa cell viability compared with control (Fig. 3A). Moreover, miR-145-5p upregulation significantly suppressed HeLa cell migration compared with NC control, while miR-145-5p knockdown showed the opposite effect (Fig. 3B and C). Similar results were observed in invasion assays (Fig. 3D and E). These results demonstrated that miR-145-5p can inhibit the migration and invasion of CC cells.
Figure 3.
Tumor suppressing effects of miR-145-5p in cervical cancer. (A) The viability of HeLa cells transfected with miR-145-5p mimics, inhibitors, mimics control or inhibitors control were determined using a Cell Counting Kit-8 assay. (B and C) Migration of transfected HeLa cells analyzed using Transwell assays. (D and E) Invasion of HeLa cells analyzed through the overexpression and knockdown of miR-145-5p using Transwell assays. Magnification, ×40. *P<0.05 and **P<0.01 vs. NC. miR, microRNA; OD, optical density; NC, negative control.
ECT1/E6E7 viability, migration and invasion is regulated by miR-145-5p
ECT1/E6E7 is a normal cervical epithelial cell line and was used to assess the effects of miR-145-5p on tumor malignancy. The expression levels of miR-145-5p increased in miR-145-5p mimics-transfected ECT1/E6E7 cells (Fig. 4A) but decreased in miR-145-5p inhibitors-transfected ECT1/E6E7 cells compared with NC control. It was found that miR-145-5p overexpression significantly decreased the viability of ECT1/E6E7 cells (Fig. 4B), but the viability of ECT1/E6E7 cells transfected with miR-145-5p inhibitors increased compared with NC control. Meanwhile, miR-145-5p knockdown significantly promoted the expression of FSCN1 protein in ECT1/E6E7 cells; however, miR-145-5p overexpression demonstrated the opposite effect (Fig. 4C and D). In addition, the migration and invasion of ECT1/E6E7 cells significantly decreased following miR-145-5p overexpression (Fig. 4E-H). However, miR-145-5p knockdown significantly increased the migration and invasion of these cells.
Figure 4.
Suppressive effects of miR-145-5p in cervical cancer. (A) The expression of miR-145-5p in ETC1/E6E7 cells transfected with miR-145-5p mimics, inhibitors, mimics control or inhibitors control was evaluated by reverse transcription-quantitative PCR. (B) Viability of ECT1/E6E7 cells transfected with miR-145-5p mimics, inhibitors, mimics control or inhibitors control were detected using a Cell Counting Kit-8 assay. (C and D) FSCN1 protein expression in ECT1/E6E7 cells transfected with miR-145-5p mimics, inhibitors, mimics control or inhibitors control was measured using western blotting. (E and F) Migration of ECT1/E6E7 cells transfected with miR-145-5p mimics, inhibitors, mimics control or inhibitors control analyzed using a Transwell assay. (G and H) Invasion of ECT1/E6E7 cells evaluated following overexpression and knockdown of miR-145-5p analyzed using a Transwell assay. Magnification, ×40. *P<0.05 and **P<0.01 vs. NC. miR, microRNA; FSCN1, fascin; OD, optical density; NC, negative control.
ECT1/E6E7 cell metastasis is regulated by FSCN1 overexpression
FSCN1 siRNA was transfected into ECT1/E6E7 cells to investigate its function to the metastasis of ETC1/E6E7 cells. FSCN1 knockdown significantly decreased the expression of FSCN1 mRNA and protein compared with control and scrambled siRNA transfection (Fig. 5A-C). In addition, the migration and invasion of ETC1/E6E7 cells were significantly inhibited by FSCN1 siRNA (Fig. 5D-G). These findings indicated that FSCN1 exerted a tumorigenesis function in ECT1/E6E7 cells.
Figure 5.
Migration and invasion of ECT1/E6E7 cells is suppressed by FSCN1 siRNA. FSCN1 expression at (A) mRNA and (B and C) protein levels were inhibited by FSCN1 siRNA in ECT1/E6E7 cells. The (D and E) migration and (F and G) invasion abilities of ECT1/E6E7 cells following knockdown of FSCN1 was analyzed using Transwell assays. Magnification, ×40. *P<0.05 and ***P<0.01 vs. NC. miR, microRNA; FSCN1, fascin; siRNA, small interfering RNA; NC, negative control.
FSCN1 is overexpressed and stimulates the metastasis of CC
HeLa cells were transfected with FSCN1 siRNA to investigate the roles of FSCN1 in CC. FSCN1 mRNA and protein expression were significantly decreased relative to the controls and scrambled siRNA (Fig. 6A-C). In addition, FSCN1 siRNA inhibited the migration and invasion of HeLa cells (Fig. 6D-G), which were similar to the effects of miR-145-5p overexpression. These findings revealed that FSCN1 promoted tumorigenesis in CC.
Figure 6.
FSCN1 siRNA inhibited the migration and invasion of cervical cancer. FSCN1 siRNA suppressed the (A) mRNA and (B and C) protein expression of FSCN1 in HeLa cells. Knockdown of FSCN1 suppressed the (D and E) migration and (F and G) invasion of HeLa cells with Transwell assays. Magnification, ×40. *P<0.05, **P<0.01 and ***P<0.001 vs. NC. FSCN1, fascin; siRNA, small interfering RNA; NC, negative control.
FSCN1 influences the tumor-suppressive function of miR-145-5p
To confirm whether FSCN1 upregulation affected the inhibitory role of miR-145-5p on the migration and invasiveness of HeLa cells, an FSCN1 overexpression vector was transfected into HeLa cells containing miR-145-5p mimics. FSCN1 expression significantly increased in HeLa cells transfected with FSCN1 vector compared with control and empty vectors (Fig. 7A-C). Moreover, FSCN1 mRNA and protein expression significantly increased following co-transfection with miR-145-5p and FSCN1 expression vector (Fig. 7D-F). In addition, FSCN1 overexpression significantly inhibited the tumor-suppressing function of miR-145-5p on the migration and invasion of HeLa cells (Fig. 7G-J). These results indicated that FSCN1 overexpression attenuated the inhibitory functions of miR-145-5p in CC.
Figure 7.
FSCN1 regulates the tumor-suppressive function of miR-145-5p. The (A) mRNA and (B and C) protein expression of FSCN1 in HeLa cells transfected with empty vector and FSCN1 expression vector. The expression of FSCN1 (D) mRNA and (E and F) protein in HeLa cells treated with miR-145 mimics with FSCN1 expression vector or empty vector. (G and H) Migration and (I and J) invasion assays conducted in HeLa cells treated with miR-145-5p and FSCN1 overexpression vector. Magnification, ×40. *P<0.05 and **P<0.01 vs. NC. FSCN1, fascin; miR, microRNA; NC, negative control.
Discussion
miRNAs inhibit mRNA degradation or translation to regulate posttranscriptional expression of target genes (22). miRNAs are important regulators of tumor metastasis, including cell differentiation, migration and invasion (23). miR-145 is downregulated in multiple types of human cancer and functions as an important tumor suppressor (24). In addition, miR-145 is downregulated in laryngeal squamous cell carcinoma, and its overexpression inhibited the proliferation and migration of Hep-2 cells by suppressing FSCN1 expression to induce cell cycle arrest and apoptosis (25). The present study showed that the expression levels of miR-145-5p were significantly decreased in CC tissues and cell lines, but FSCN1 levels were significantly increased in these tissues and cells. Meanwhile, it was found that miR-145-5p targeted FSCN1 and regulated its expression using luciferase reporter assays, suggesting that FSCN1 is a target of miR-145-5p in CC.
FSCN1, an actin-connecting protein, are present in mesenchymal tissues but is downregulated in adult epithelial cells (14). FSCN1 stabilizes the generation of parallel actin bundles in cell-protruding areas during the early phase of cell movement in physiological and neoplastic conditions (15). FSCN1 is expressed in various epithelial and non-epithelial neoplasms, but it is overexpressed in malignant cells, especially at deep tumor margins (26). FSCN1 is overexpressed in most cervical intraepithelial neoplasia (CIN) lesions, which may indicate increased invasion in high grade CIN, indicating that FSCN1 could have value as a diagnostic biomarker of superficial stromal invasion (27). The present study reported that knockdown of miR-145-5p promoted the expression of FSCN1 in HeLa and ECT1/E6E7 cells; however, overexpression of miR-145-5p repressed the expression of FSCN1. In addition, the migration and invasion of HeLa and ECT1/E6E7 cells were enhanced by the overexpression of miR-145-5p but suppressed by the downregulation of this miRNA. A previous study reported that the inhibition of FSCN1 decreased the activity of the MAPK pathway and suppressed the growth and metastasis of non-small cell lung cancer (NSCLC) cells, indicating that it may be a potentially effective therapeutic strategy for treating NSCLC (28). In addition, FSCN1 is an important mediator of TGF-β1-induced invasion and migration of kidney cancer cells (KCC) via ERK and JNK signaling pathways (29). FSCN1 could act as an oncogene and a potential novel prognostic biomarker for patients with renal cell carcinoma (RCC) after nephrectomy, and can promote RCC metastasis (30). However, the signaling pathway of FSCN1 involved in CC is still unclear and will be investigated in future studies.
In summary, miR-145-5p overexpression significantly inhibited the proliferation, migration and invasion of HeLa and ECT1/E6E7 cells, and silencing of FSCN1 expression similarly restricted the proliferation, migration and invasion of these cells. The miR-145/FSCN1 axis facilitated the progression of CC by restricting CC cell proliferation. However, the present study did not assess the function of miR-145-5p-targeted FSCN1 in animal experiments. Follow-up studies will focus on their functions in animal models. Overall, the present findings may provide insight for further studies investigating the effects of miR-145-5p functions and underlying mechanisms on the biological behavior of CC.
Acknowledgements
Not applicable.
Funding
No funding was received.
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Authors' contributions
SH and SL designed all the experiments, drafted and revised this manuscript. SH, GY and KP performed the experiments and analyzed all data. All authors read and approved the final manuscript.
Ethics approval and consent to participate
The present study was approved by the Ethics Committee of the First Affiliated Hospital of Nanchang University (approval no. 2018023). Written informed consent was obtained from all patients.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Data Availability Statement
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.