Open Access

miR‑584 inhibits cell proliferation, migration and invasion in vitro and enhances the sensitivity to cisplatin in human cervical cancer by negatively targeting GLI1

  • Authors:
    • Tingfeng Wang
    • Juan Feng
    • Aiyun Zhang
  • View Affiliations

  • Published online on: January 14, 2020     https://doi.org/10.3892/etm.2020.8449
  • Pages: 2059-2066
  • Copyright: © Wang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Cervical cancer is the most lethal malignancy amongst women worldwide. MicroRNAs (miRNAs/miRs) play a critical role in the progression of cervical cancer. Compelling evidence indicates that miR‑584 acts as a tumor suppressor in some types of cancers. However, the function of miR‑584 in cervical cancer has not been illustrated. In the present study, the effects and mechanism of miR‑584 in the process of proliferation, migration and invasion, and drug sensitivity to cisplatin in cervical cancer were determined. miR‑584 expression decreased markedly in cervical cancer tissues and cell lines compared with healthy control samples. Dual‑luciferase reporter assays confirmed that glioma‑associated oncogene 1 (GLI1) is a novel molecular target of miR‑584. The overexpression of miR‑584 inhibited the expression of GLI1, reduced cell proliferation, migration and invasion, and induced apoptosis in HeLa cells. However, the silencing of miR‑584 in CaSki cells produced the opposite effects. In addition, the overexpression of GLI1 in HeLa‑cells overexpressing miR‑584 markedly reversed the miR‑584‑induced inhibitory effect. Flow cytometry results showed that miR‑584 enhanced cisplatin sensitivity by promoting chemotherapy‑induced apoptosis. Therefore, miR‑584 acted as a tumor suppressor miRNA and might be a novel target gene for future cervical cancer treatments.

Introduction

Cervical cancer is associated with some of the highest rates of morbidities and mortalities in females worldwide (1). Although the clinical outcome of therapy in patients improves through early diagnosis, surgical resection, and chemotherapy/radiation therapy, the prognosis remains pessimistic (2). The main reasons for the death of patients with cervical cancer are cancer progression, metastasis, and drug resistance (3). Therefore, gaining full understanding of the molecular mechanisms underlying the tumorigenesis and tumor progression of cervical cancer and developing novel methods of treatment for patients with this disease is essential.

MicroRNAs (miRNAs/miRs) are a class of small (~22 nucleotides) non-coding RNAs that function as negative regulators of gene expression by binding to complimentary sequences mainly in the 3′-untranslated regions (3′-UTRs) of specific mRNAs (4). Accumulating evidence indicates that miRNAs play a critical role in regulating various biological processes, such as cell proliferation, metastasis, and drug resistance (4,5). miR-584 serves as tumor suppressor in several tumor types (613). However, the same miRNA may either serve as an oncogene or a tumor suppressor, depending on the characteristic of its target genes (14). Therefore, the biological function and molecular mechanism of miR-584 in cervical cancer must be determined.

Glioma-associated oncogene 1 (GLI1) is an important transcription factor in the Hedgehog signalling pathway that can regulate transcription and expression of various target genes, such as c-MYC and PTCH1, thereby affecting cell proliferation, apoptosis, migration and invasion (15,16). GLI1 acts as an oncogene and is regulated by miR-361-3p in cervical cancer (17). However, to the best of our knowledge, the association between miR-584 and GLI1 has not been illustrated.

In the current study, the expression level of miR-584 was analyzed in cervical cancer to illustrate the biological functions and the molecular mechanism of miR-584.

Materials and methods

Tissue collection

Cervical cancer tissues and adjacent normal tissues were obtained from 30 patients who underwent surgical resection between December 2015 and December 2017 at the Department of Gynaecology and Obstetrics, Weifang Maternity and Child Care Hospital. Patients were excluded from this study if they were receiving any anticancer treatment. Tissues were immediately frozen in liquid nitrogen and stored at −80°C for further usage. The experimental protocol was approved by the Ethics Committee of Weifang Maternity and Child Care Hospital, and a signed informed consent was obtained from all patients before the study.

Cell culture and cell transfection

Human cervical cancer cell lines (C33A, CaSki, HeLa and SiHa) and human immortalized normal cervical cell line Ect1/E6E7 were obtained from American Type Culture Collection. 293T cells were obtained from The Cell Bank of Type Culture Collection of the Chinese Academy of Sciences (Shanghai, China). All cell lines were grown in DMEM (HyClone; GE Healthcare Life Sciences) supplemented with 10% FBS (HyClone; GE Healthcare Life Sciences), 100 U/ml penicillin and 100 µg/ml streptomycin (Beyotime Institute of Biotechnology) in a humidified atmosphere at 37°C containing 5% CO2. The miR-584 mimics (mimics) (5′-AGUCAAGGUCCAAUUGGUCCGA-3′), miR-584 mimics negative control (miR-NC) (5′-ACUACUGAGUGACAGUAGA-3′), miR-584 inhibitors (inhibitors) (5′-GCUCUGCUACACUCGGUACUA-3′) and miR-584 inhibitors negative control (anti-NC) (5′-UUCUCCGAACGUGUCACGUTT-3′) were synthesized by Guangzhou RiboBio, Co., Ltd. Full-length GLI1 from the human cDNA library was cloned into a pcDNA3.1 vector (Invitrogen; Thermo Fisher Scientific, Inc.). The pcDNA3.1 vector alone (empty plasmid) served as a negative control. The HeLa cells were transfected with miR-NC (50 nM) or miR-584 mimics (50 nM) and/or pcDNA3.1/GLI1 vector (100 nM) or pcDNA3.1 (100 nM) using Lipofectamine® 2000 reagent (Invitrogen; Thermo Fisher Scientific, Inc.) according to the manufacturer's protocol. The CaSki cells were transfected with anti-NC (50 nM) or miR-584 inhibitors (50 nM) using Lipofectamine® 2000 reagent (Invitrogen; Thermo Fisher Scientific, Inc.) according to the manufacturer's protocol. Following transfection for 48 h, the cells were collected for subsequent experiments.

Cell Counting Kit-8 (CCK-8) assays

HeLa and CaSki cell viability was detected using CCK-8 (Beyotime Institute of Biotechnology). HeLa and CaSki cells (1×103 cells/well) were cultured in 96-well plates for 0, 24, 48, and 72 h. At the indicated timepoints, 10 µl of CCK-8 was added to each well and incubated for 3 h. The absorbance of each well was then determined using Multiskan MK3 (Thermo Fisher Scientific, Inc.).

Colony formation assay

HeLa and CaSki cells (400 cells/well) were seeded in six-well plates and cultured in DMEM (HyClone; GE Healthcare Life Sciences) supplemented with 10% FBS (HyClone; GE Healthcare Life Sciences) for 10 days. The cells were then fixed with 1 ml 4% paraformaldehyde (PFA; Beyotime Institute of Biotechnology) and stained with crystal violet. The number of colonies containing >50 cells was counted with a light microscope (magnification, ×100; Olympus Corporation).

Transwell assay

The migration and invasion capability of cells was detected with Corning Transwell chambers (Corning, Inc.). For invasion capability detection, the Transwell membrane filter was precoated with 30 µl of Matrigel (BD Biosciences) at 37°C for 4 h. In the migration and invasion examination, HeLa and CaSki cells (5×104 cells) were resuspended in 100 µl DMEM without FBS and transferred to the upper chambers. A total of 600 µl of DMEM supplemented with 10% FBS was added to the lower chamber. Cells were incubated for 12 h before being fixed with 4% PFA, stained with 0.5% crystal violet at room temperature for 20 min, and the stained cells from six random fields were counted, and the images were captured under a light microscope (Olympus Corporation; magnification, ×100).

Western blotting

Tissue samples and the treated cells were lysed in radioimmunoprecipitation assay buffer (Beyotime Institute of Biotechnology). Protein concentrations were determined using a BCA Protein Assay kit (Pierce; Thermo Fisher Scientific, Inc.). Equal amounts of protein extracts (30 µg total protein/lane) were resolved by 10% SDS-PAGE and transferred onto PVDF membranes, followed by blocking with 5% nonfat dried milk for 1 h at room temperature. Subsequently, the PVDF membranes were incubated with primary GLI1 antibody (cat. no. ab49314; 1:500; Abcam) and β-actin antibody (cat. no. ab8227; 1:1,000; Abcam) overnight at 4°C with gentle agitation, and then treated with a Horseradish peroxidase-labeled goat anti-rabbit secondary antibody (1:1,000; cat. no. ab150077; Abcam) for 2 h at room temperature. β-actin was used as a loading control. The protein bands were visualized using an enhanced chemiluminescence system (Beyotime Institute of Biotechnology).

RNA extraction and reverse transcription-quantitative PCR (RT-qPCR)

Total RNA from cells and tissues was extracted with TRIzol reagent (Thermo Fisher Scientific, Inc.). cDNA was synthesized using a TaqMan® MicroRNA Reverse Transcription kit (Thermo Fisher Scientific, Inc.) according to the manufacturer's instructions. To quantify the miRNA and mRNA, a qPCR assay was performed using iQ™ SYBR® Green Supermix (Bio-Rad Laboratories, Inc.) in an iCycler iQ™ qPCR detection system (Bio-Rad Laboratories, Inc.). The relative expression levels of miR-584 and GLI1 were calculated as the inverse log of ΔΔCq and normalized to the reference gene (18). The thermocycling conditions were as follows: 95°C for 10 min; followed by 40 cycles of 95°C for 15 sec and 60°C for 1 min; annealing at 55°C for 30 sec; and elongation at 72°C for 3 min. To analyze GLI1 mRNA expression, β-actin acted as an internal control. To examine the expression of miR-584, U6 was used as the internal control. The following primer pairs were used: miR-584 forward, 5′-TGCAATGTGTGTGTTAGCCA-3′, and reverse, 5′-ATCATTGCTCCTTGGATGGT-3′; GLI1 forward, 5′-TACTCACGCCTCGAAAACCT-3′ and reverse, 5′-AGGACCATGCACTGTCTTGA-3′; U6 forward, 5′-TGCGGGTGCTCGCTTCGCAGC-3′ and reverse, 5′-CCAGTGCAGGGTCCGAGGT-3′; β-actin forward, 5′-GATCATTGCTCCTCCTGAGC-3′ and reverse, 5′-ACTCCTGCTTGCTGATCCAC-3′.

Flow cytometry

Transfected HeLa and CaSki cells were treated with 10 µM cisplatin (Jiangsu Hansoh Pharmaceutical Co. Ltd.) for 24 h at 37°C. The apoptosis rate of cells was then detected using an Annexin V-PI Assay kit (Beyotime Institute of Biotechnology) according to the manufacturer's instructions. A flow cytometer (Cytomics FC 500 MPL; Beckman Coulter, Inc.) was used to analyze the rate of apoptosis in each sample. Data were analyzed using ModFit LT 3.0 (Verity Software House, Inc.).

Luciferase reporter assay

The wild-type (WT) or mutant (MUT) GLI1-3′UTR, which contained the miR-584 binding sites, was inserted into the psiCHECK2 vector (Promega Corporation) 293T cells (1×105 cells/well) were co-transfected with 0.1 mg psiCHECK2-WT GLI1-3e miR-5r 0.1 mg psiCHECK2-MUT GLI1-3′-UTR and 10 nM miR-584 mimics or 10 nM miR-584 inhibitors using Lipofectamine® 2000 reagent (Invitrogen; Thermo Fisher Scientific, Inc.) according to the manufacturer's protocol. Cells were cultured at 37°C for 48 h and luciferase activities were analyzed using dual-luciferase kit (GeneCopoeia, Inc.) according to the manufacturer's protocol. The activity of firefly luciferase was normalized to the corresponding Renilla luciferase activity.

Bioinformatics prediction

To investigate the possible target genes of miR-584, the online prediction system, TargetScan 7.1 software (http://www.targetscan.org), was used.

Statistical analysis

Results are presented as the mean ± SEM. Significance was established using the SPSS 13.0 software (SPSS, Inc). Data were analyzed using a Student's t-test or one-way analysis of variance followed by Tukey's Honest Significant Difference test. Pearson's correlation analysis was used to analyze the correlation between miR-584 and GLI1 mRNA expression. P<0.05 was considered to indicate a statistically significant difference.

Results

Expression of miR-584 is downregulated in human cervical cancer tissues and cells

To explore the role of miR-584 in cervical cancer, miR-584 expression was first detected in 30 pairs of cervical cancer tissues and adjacent normal tissues by RT-qPCR. RT-qPCR results illustrated that the expression of miR-584 was significantly downregulated in tumor tissues compared with normal tissues (Fig. 1A). In addition, the expression levels of miR-584 were analyzed in immortalized normal cervical cell line Ect1/E6E7 and four types of cervical cancer cells (C33A, SiHa, HeL and CaSki) using RT-qPCR. The results showed that the expression of miR-584 in cervical cancer cell lines was significantly reduced compared with Ect1/E6E7 cells (Fig. 1B).

miR-584 inhibits cervical cancer cell proliferation and metastasis

To study the effects of miR-584 in cervical cancer progression, miR-584 overexpression or inhibition assays were performed in HeLa and CaSki cells, which contained the lowest or highest endogenous miR-584 expression levels, respectively. The results of the RT-qPCR assay illustrated that miR-584 expression was significantly increased in HeLa cells and significantly downregulated in CaSki cells when compared with controls (Fig. 2A). The results of the CCK-8 (Fig. 2B) and colony formation assay (Fig. 2C) illustrated that the proliferation of HeLa cells transfected with miR-584 mimics was markedly inhibited compared with the miR-NC group. Conversely, a significant increase in cell proliferation was observed in CaSki cells transfected with miR-584 inhibitors when compared with controls (Fig. 2C and D). Furthermore, the Transwell assay illustrated that the migration and invasion ability of the HeLa cells transfected with miR-584 mimics markedly decreased compared to the miR-NC group, while the silencing of miR-584 increased the migration and the invasion capability of the CaSki cells (Fig. 2E and F).

GLI1 is a molecular target gene of miR-584

To assess the underlying mechanisms of miR-584 in the progression of cervical cancer cells, Targetscan was used to predict potential target genes of miR-584. GLI1 mRNA 3′-UTR was found to contain highly conserved binding sites for miR-584 (Fig. 3A). A luciferase reporter assay was performed to analyze the association between GLI1 and miR-584. A miR-584 mimic or inhibitor and a luciferase reporter plasmid containing a wt or mut 3′-UTR binding site of human GLI1 were co-transfected into 293T cells. miR-584 mimics significantly decreased the luciferase activity in 293T cells containing the GLI1 wt 3′-UTR but failed to suppress this activity in cells with the mut GLI1 3′-UTR, while the miR-584 inhibitors enhanced the luciferase activity in 293T cells containing the GLI1 wt 3′-UTR (Fig. 3B). These data demonstrated that GLI1 is a specific target of miR-584 (Fig. 3B). Furthermore, the results of the RT-qPCR and western blotting illustrated that overexpression of miR-584 downregulated the expression of GLI1 in HeLa cells both at mRNA (Fig. 3C) and protein (Fig. 3D) levels compared with miR-NC cells, while the silencing of miR-584 in CaSki cells resulted in opposite results, further confirming that GLI1 is a target gene of miR-584. The mRNA expression levels of GLI1 were subsequently analyzed in breast cancer samples and corresponding normal tissues using RT-qPCR. The expression of GLI1 at the mRNA level was significantly higher in breast cancer tissues than in adjacent normal tissues (Fig. 3E). In addition, Pearson's correlation analysis (linear regression analysis) showed that the mRNA expression level of GLI1 was inversely correlated with the expression of miR-584 in breast cancer tissues (Fig. 3F).

GLI1 is a functional target gene of miR-584

To further illustrate whether GLI1 is a function target gene of miR-584, HeLa cells were co-transfected with miR-584 mimic and GLI1 plasmid or empty plasmid. The western blot results illustrated that the protein expression of GLI1 was markedly increased in HeLa cells co-transfected with both miR-584 mimic and GLI1 plasmid compared with cells co-transfected with miR-584 mimic and empty plasmid (Fig. 4A). The CCK-8 (Fig. 4B) and colony formation assay (Fig. 4C) illustrated that the overexpression of GLI1 significantly rescued the proliferation rate decreased by miR-584 mimics. Furthermore, the Transwell assay illustrated that the metastatic capability of HeLa cells co-transfected with both miR-584 mimics and GLI1 plasmid was enhanced compared with HeLa cells co-transfected with miR-584 mimic and empty plasmid (Fig. 4D). These data illustrated that GLI1 was a functional target gene of miR-584.

miR-584 promotes drug sensitivity to cisplatin in cervical cancer cells

The association between miR-584 and cisplatin was determined. Flow cytometry was used to analyze the effects of miR-584 on the drug sensitivity of HeLa and CaSki cells. The results illustrated that overexpression of miR-584 increased the proportion of apoptotic cells compared with the miR-NC group in HeLa and CaSki cells (Fig. 5A and B). In addition, the combination of miR-584 and cisplatin significantly enhanced the apoptosis rate of HeLa and CaSki cells compared with cisplatin or miR-584 mimics, respectively (Fig. 5A and B). These data suggested that miR-584 enhanced the sensitivity of cervical cancer cells to cisplatin.

Discussion

A number of studies have illustrated the relationship between cancer progression and deregulated miRNA expression (19). Several miRNAs act as either tumor suppressors or oncogenes involved in cervical cancer progression (19). Decreased expression of tumor suppressor miRNAs leads to enhanced oncogene translation, which in turn enhances tumor development. Similar effects are caused by oncogenic miRNA overexpression, which contributes to the inhibition of tumor suppressor genes (20).

miR-584 acts as a tumor suppressor and is downregulated in some types of cancer (613). However, to the best of our knowledge, the expression and functions of miR-584 in cervical cancer have not been elucidated. In the present study, the expression of miR-584 was markedly downregulated in cervical cancer tissues and cell lines compared with adjacent normal cervical tissues and Ect1/E6E7 cells. The current study illustrated the role of miR-584 in cervical cancer cell proliferation, metastasis and apoptosis. The results suggested that miR-584 overexpression inhibited the viability, proliferation, migration and invasion of these cells and enhanced the apoptosis rate in vitro.

Recent studies confirmed that miRNAs inhibit the expression of specific target genes, which leads to tumor occurrence. In medulloblastoma, miR-584 was downregulated in tumor tissues compared with normal tissues, and histone deacytelase 1 and eIF4E3 were the direct target genes of miR-584 (21). In lung cancer, miR-584 was downregulated and inhibited cell growth and metastasis by directly targeting metadherin (6). In gastric cancer, miR-584 directly targeted the matrix metalloproteinase-14 (MMP-14) promoter to repress YY1-facilitated MMP-14 expression and inhibited gastric cancer progression (7). In the current study, miR-584 directly targeted GLI1 and negatively regulated the expression of GLI1 to inhibit cervical cancer progression. GLI proteins, including GLI1, GLI2 and GLI3, are zinc finger transcription factors and are the main effectors of the Hedgehog signalling (22). In primary cilium, GLI1 dissociates from the negative regulator suppressor of fused, is converted into its activated form and translocates to the nucleus (22). The translocation of GLI1 enhances the downstream target oncogene expression, such as cyclin D1 and homeobox protein NANOG (22). GLI1 is overexpressed in numerous types of cancer, such as non-small cell lung cancer, gastric cancer, pancreatic cancer and colon cancers, and acts as an oncogene in these tumors (15,23). The current study confirmed that GLI1 is upregulated in cervical cancer tissues, as reported previously (24). miR-584 decreased the expression of GLI1 through the direct binding of the 3′-UTR of GLI1. In addition, the inverse correlation between miR-584 expression and mRNA expression of GLI1 in cervical cancer tissues further supported this conclusion. Moreover, GLI1 overexpression reduced the effects of miR-584 on cell survival and metastasis in cervical cancer. Together, these findings suggested that GLI1 was indeed a direct target gene of miR-584.

Chemoresistance in cancer is the main cause of treatment failure (3). Recent data indicated that aberrant miRNA expression was closely linked to chemoresistance by targeting genes related to chemosensitivity or chemoresistance (25). However, specific chemoresistance-related miRNAs are largely unknown. Cisplatin resistance is a major obstacle to the successful treatment of cervical cancer (3). The current study further illustrated the association between the sensitivity of cells to cisplatin and miR-584 in cervical cancer. miR-584 had a negative impact on cisplatin resistance in HeLa cells. In the current study, it was indicated that GLI1 was a direct target gene of miR-584. Therefore, the underlying mechanism of miR-584 to drug resistance may be through GLI1.

In conclusion, the current study demonstrated that miR-584 is markedly downregulated in human cervical cancer tissues and cell lines. Overexpression of miR-584 inhibited proliferation, invasion, and migration, while enhancing cell apoptosis rates and chemosensitivity to cisplatin in cervical cells. GLI1 was identified as the molecular and biological target gene of miR-584. These data illustrated that miR-584 may serve as a novel therapeutic target in cervical cancer.

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

TW and AZ conceived and designed the experiments. TW, JF and AZ conducted all of the experiments. TW and JF wrote and revised the manuscript. All authors read and approved the final manuscript.

Ethics approval and consent to participate

The study was approved by the Ethics Committee of Weifang Maternity and Child Care Hospital. Prior written informed consent was obtained from each patient.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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March-2020
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Wang T, Feng J and Zhang A: miR‑584 inhibits cell proliferation, migration and invasion in vitro and enhances the sensitivity to cisplatin in human cervical cancer by negatively targeting GLI1. Exp Ther Med 19: 2059-2066, 2020.
APA
Wang, T., Feng, J., & Zhang, A. (2020). miR‑584 inhibits cell proliferation, migration and invasion in vitro and enhances the sensitivity to cisplatin in human cervical cancer by negatively targeting GLI1. Experimental and Therapeutic Medicine, 19, 2059-2066. https://doi.org/10.3892/etm.2020.8449
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Wang, T., Feng, J., Zhang, A."miR‑584 inhibits cell proliferation, migration and invasion in vitro and enhances the sensitivity to cisplatin in human cervical cancer by negatively targeting GLI1". Experimental and Therapeutic Medicine 19.3 (2020): 2059-2066.
Chicago
Wang, T., Feng, J., Zhang, A."miR‑584 inhibits cell proliferation, migration and invasion in vitro and enhances the sensitivity to cisplatin in human cervical cancer by negatively targeting GLI1". Experimental and Therapeutic Medicine 19, no. 3 (2020): 2059-2066. https://doi.org/10.3892/etm.2020.8449