Open Access

MicroRNA‑1288 promotes cell proliferation of human glioblastoma cells by repressing ubiquitin carboxyl‑terminal hydrolase CYLD expression

  • Authors:
    • Jun Yin
    • Chengyin Weng
    • Jieke Ma
    • Fanfan Chen
    • Yecai Huang
    • Mei Feng
  • View Affiliations

  • Published online on: September 13, 2017     https://doi.org/10.3892/mmr.2017.7481
  • Pages: 6764-6770
  • Copyright: © Yin et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Previous studies have demonstrated that microRNAs (miRs) are important regulators involved in various cancers, including human glioblastoma (GBM). However, the underlying mechanism of miR‑1288 remains poorly understood, and its role in GBM has not been reported. The present study confirmed that miR‑1288 expression was markedly upregulated in GBM. Ectopic expression of miR‑1288 promoted the prolife­ration, colony formation and anchorage‑independent growth of GBM cells. Bioinformatics analysis coupled with western blotting and luciferase report assays also indicated that miR‑1288 promoted cell proliferation of GBM by targeting ubiquitin carboxyl‑terminal hydrolase (CYLD). Knockdown of CYLD expression reversed the cell proliferation promotion by miR‑1288‑in in GBM. These results suggest that the miR‑1288/CYLD axis may represent a potential therapeutic target for the treatment of GBM.

Introduction

Human glioblastoma (GBM) is the most frequent and aggressive type of primary brain tumor in adults, and remains an important health problem worldwide (1). Although advances in the treatment strategies of GBM have been made, the 5-year survival rate of GBM patients remains poor (2). Thus, it is important to investigate novel therapeutic strategies for GBM treatment.

Accumulating studies have demonstrated that microRNAs (miRNAs/miRs), a class of small and non-coding RNAs, participate in various biological processes of cancer development by binding to the 3′-untranslated region (3′-UTR) of mRNA (35). For example, miR-300 was reported to serve as a tumor suppressor gene and suppress GBM progression by ROCK1 (6). miR-595 was demonstrated to serve a critical role in GBM carcinogenesis by suppression of transcription factor SOX7 (7). Chen et al (8) indicated that miR-22 suppresses cell proliferation, motility and invasion of GBM by directly targeting NAD-dependent protein deacetylase sirtuin-1. To date, the role of miR-1288 in GBM remains unclear. Gopalan et al (9) revealed that overexpression of miR-1288 in colon cancer cells promotes cell proliferation and increases the percentage of G2-M phase cells. In addition, they demonstrated that miR-1288 overexpression increases cell proliferation and colony formation, and enhances cell migration and cell invasion properties in oesophageal squamous cell carcinoma by regulating forkhead box protein O1 (10). The present study observed aberrantly increased expression of miR-1288 in GBM tissues/cells. Next, we experimentally revealed that miR-1288 acted as a tumor promoter by interacting with ubiquitin carboxyl-terminal hydrolase CYLD (CYLD), and then regulating cell proliferation in GBM.

Materials and methods

Clinical specimens

Eight paired surgically-removed human glioblastoma tissues were obtained from GBM patients, and two normal brain tissues were obtained from individuals who passed away in traffic accidents, and then histopathologically diagnosed at Sichuan Cancer Hospital (Sichuan, China). The present study was approved by the ethics committee of Sichuan Cancer Hospital. All samples were collected and analyzed with prior written informed consent from the patients. Tissue samples were frozen in liquid nitrogen and stored until total RNAs or proteins were extracted.

miR-1288 expression profiles (GSE61710) in GBM tissues were obtained from Gene Expression Omnibus (GEO; www.ncbi.nlm.nih.gov/geo/). Archived patient samples in The Cancer Genome Atlas (TCGA) database (https://tcga-data.nci.nih.gov and https://genomecancer.ucsc.edu) were selected.

Cell culture

The LN229, LN18, U87MG, A172, D27MG and LN340 human GBM cell lines were provided by the National Rodent Laboratory Animal Resource (Shanghai, China) and were grown in Dulbecco's modified Eagle's medium (Gibco; Thermo Fisher Scientific, Inc., Waltham, MA, USA) supplemented with 10% fetal bovine serum (FBS; Sigma-Aldrich; Merck KGaA, Darmstadt, Germany). Normal human astrocyte (NHA) cells were obtained from Lonza Group, Ltd. (Basel, Switzerland) and cultured in the provided astrocyte growth media supplemented with recombinant human epidermal growth factor, insulin, ascorbic acid, GA-1000, L-glutamine and 5% FBS. Cell lines were cultured in a humidified incubator at 37°C in 5% CO2.

RNA extraction and reverse transcription-quantitative polymerase chain reaction (RT-qPCR)

Total RNA including miRNAs was extracted from human tissue samples and cell lines using TRIzol reagent (Thermo Fisher Scientific, Inc.). RNA was reverse transcribed to cDNA from RNA using a Reverse Transcription kit (Takara Biotechnology Co., Ltd., Dalian, China) according to the manufacturer's protocol. qPCR was performed with SYBR Green (Takara Biotechnology Co., Ltd.) on a ABI 7500 thermocycler. Thermocycling conditions were as follows: At 95°C for 30 sec, followed by 40 cycles of amplification at 95°C for 5 sec, at 59°C for 30 sec and at 72°C for 30 sec. The sequences of primers were synthesized by GeneCopoeia, Inc. (Rockville, MD, USA): miR-1288 (cat. no. HmiRQP0132), cyclin D1 (cat. no. HQP016204) and MYC (cat. no. HQP011597). U6 and GAPDH (cat. no. HQP064347) were used as endogenous controls for miRNA and mRNA, respectively, and the data were analyzed according to the 2−ΔΔCq method (11).

Plasmids, small interfering RNA and transfection

miR-1288 mimics (miR10005942-1-5), a miR-1288 inhibitor (miR-1288-in; miR20005942-1-5), negative control sequences and CYLD-specific small interfering (si)RNA and scramble sequences were synthesized and purified by Guangzhou RiboBio Co., Ltd. (Guangzhou, China), and transfection into cells was performed using Lipofectamine 2000 (Invitrogen; Thermo Fisher Scientific, Inc.) according to the manufacturer's protocol.

MTT and colony formation assays

Cell growth was measured by MTT assay. Cells were seeded at 5×104 cells/well into a 24-well plate after each transfection. After 1, 2, 3, 4 and 5 days of culture at 37°C, cell viability was assessed by MTT assay. MTT solution (20 µl; 0.5 mg/ml; Sigma-Aldrich; Merck KGaA) was added to each well at 37°C. The medium was removed from each well and the formazan was solubilized in 150 µl dimethyl sulfoxide (Sigma-Aldrich; Merck KGaA). The absorbance of each well at 490 nm was measured using a Multiskan GO microplate spectrophotometer (Thermo Fisher Scientific, Inc.).

For the colony formation assay, a density of 1,000 indicated U87MG cells/well upon different treatments were seeded into a 6-well cell culture plate and incubated for 14 days at room temperature. Colonies were fixed with 4% paraformaldehyde for 5 min and stained at room temperature with 1.0% crystal violet for 30 sec. The number of colonies was counted under a microscope (Motic AE30 inverted fluorescence microscope; Microscope Systems Limited, Glasgow, UK) at magnification, ×100.

Anchorage-independent growth assay

Cells (1,000) were suspended in 2 ml complete medium plus 0.3% agar (Sigma-Aldrich; Merck KGaA) and then plated on top of a bottom layer containing 0.5% complete medium agar mixture. After 14 days, viable colonies that were larger than 0.1 mm in diameter were counted by microscopy (Motic AE30 inverted fluorescence microscope; Microscope Systems Limited).

Bromodeoxyuridine (BrdU) staining

U87MG cells after transfection were incubated with 10 µM BrdU for 1 h and for an extra hour after the transfer to fresh medium, fixed with 4% paraformaldehyde for 30 min at room temperature and then stained at 4°C overnight with BrdU antibodies (1:500; cat no. 61273; Upstate Biotechnology, Inc., Lake Placid, NY, USA) according to the manufacturer's protocol. After incubation at 37°C for 1 h with horseradish peroxidase (HRP)-conjugated secondary antibodies (1:5,000; Abcam, Cambridge, UK), images were acquired using a laser scanning microscope (Axioskop 2 plus; Zeiss GmbH, Jena, Germany). All experiments were performed at least three times.

MiRNA target prediction and luciferase assays

Potential target genes of miR-1288 were predicted using TargetScan online software version 3.1 (http://www.targetscan.org). Cells were co-transfected with the wild-type CYLD 3´UTR (GeneCopoeia, Inc.) or the control-luciferase plasmid and miR-1288 or miR-1288-mutant (mut). Each group was also co-transfected with 5 ng control pRL-TK Renilla plasmid (Promega Corporation, Madison, WI, USA) using Lipofectamine 2000 (Invitrogen; Thermo Fisher Scientific, Inc.). Luciferase and Renilla activities were assessed 48 h after transfection using a Dual Luciferase Reporter Assay kit (Promega Corporation) according to the manufacturer's protocol.

Western blot analysis

Protein lysates were prepared using radioimmunoprecipitation assay lysis buffer (Cell Signaling Technology, Inc., Danvers, MA, USA). The protein concentration was determined using a bicinchoninic acid protein assay. Equal amounts (40 µg) of proteins were separated by 10% SDS-PAGE and electrotransferred onto polyvinylidene difluoride membranes (EMD Millipore, Billerica, MA, USA). Membranes were subsequently blocked in TBS containing 0.5% Tween-20 with 5% milk for 2 h at room temperature and incubated at 4°C with the following primary antibodies overnight: Anti-CYLD (cat no. 8462; 1:1,000), anti-cyclin D1 (cat no. 2978; 1:1,000) and anti-c-MYC (cat no. 5605; 1:1,000; all Cell Signaling Technology, Inc.). An anti-α-tubulin monoclonal antibody (cat no. T6199; 1:5,000; Sigma-Aldrich; Merck KGaA) served as a loading control. The blots were then incubated at 37°C for 2 h with a HRP-conjugated anti-rabbit immunoglobulin secondary antibody (cat no. P0023D; 1:5,000; Beyotime Institute of Biotechnology, Haimen, China). The signals were visualized using enhanced chemiluminescence following the manufacturer's protocol.

Statistical analysis

All data are expressed as the mean ± standard deviation. The data were analyzed using Student's t-test for pair-wise comparisons or one-way analysis of variance followed by a post hoc Tukey test for multiple comparisons. Statistical analysis was performed using SPSS 19.0 software (IBM Corp., Armonk, NY, USA). P<0.05 was considered to indicate a statistically significant difference.

Results

miR-1288 expression is upregulated in GBM

To reveal the role of miR-1288 in GBM, the expression data downloaded from the Gene Expression Omnibus (GEO, accession number GSE61710) was analyzed. The results of the GEO analysis demonstrated that miR-1288 levels were significantly increased in malignant glioma tissues compared with glioma peritumoral tissues (Fig. 1A). To further confirm this observation, the expression of miR-1288 in human glioblastoma tissues and normal brain tissues was measured by RT-qPCR. miR-1288 expression was significantly upregulated in GBM tissues compared with normal brain tissues (Fig. 1B). The expression of miR-1288 in LN229, LN443, LN18, U87MG, A172, D27MG and LN340 GBM cells was further detected, and the result indicated that compared with NHA cells, miR-1288 expression was significantly increased in GBM cells (Fig. 1C). miR-1288 expression in U87MG cells was less abundant than in A172 cells, but was more abundant compared with the other GBM cell lines. Therefore, the U87MG cell line may the most appropriate model for studying the expression of miR-1288 in relation to GBM.

miR-1288 promotes, while miR-1288-in inhibits GBM cell proliferation

To investigate whether GBM cell proliferation was regulated by miR-1288, U87MG cells were cotransfected with miR-1288 or miR-1288-in or the respective controls. RT-qPCR analysis was used to verify relative miR-1288 expression (Fig. 2A and B). MTT assay revealed that ectopic overexpression of miR-1288 markedly enhanced cell proliferation of U87MG cells, while suppression of cell proliferation by miR-1288-in (Fig. 2B and C). Similarly, a colony formation assay demonstrated that compared with the relative negative control, miR-1288 significantly promoted while miR-1288-in markedly suppressed colony formation of U87MG cells (Fig. 3A and B). Additionally, the anchorage-independent growth ability of U87MG cells transfected with miR-1288 was significantly increased, and miR-1288-in treatment caused a decrease in the anchorage-independent growth ability of U87MG cells (Fig. 3C and D). BrdU assay results demonstrated that BrdU-positive cells were significantly increased in the U87MG cell line after transfection with miR-1288, while miR-1288-in exhibited the opposite effect (Figs. 2E and 3E). These results demonstrated that miR-1288 increases GBM cell tumorigenicity in vitro.

miR-1288 directly targets CYLD by binding to its 3′-UTR

Bioinformatics methods (http://www.targetscan.org) identified CYLD as a potential target of miR-1288 (Fig. 4A). To elucidate whether CYLD is indeed directly targeted by miR-1288, the present study investigated whether miR-1288 recognizes the 3′UTR of CYLD mRNA using western blot analysis and dual-luciferase reporter assay. Western blot analysis demonstrated that CYLD was decreased in miR-1288-transfected U87MG cells, while miR-1288-in clearly increased CYLD protein expression (Fig. 4B). A CYLD 3′-UTR wild-type vector was co-transfected into U87MG cells with miR-1288, miR-1288-in or miR-NC, and then measured by luciferase activity. The results revealed that transfection of miR-1288 markedly suppressed the luciferase activity of CYLD 3′-UTR wild-type in U87MG cells, transfection of miR-1288-in significantly increased the luciferase activity of CYLD 3′-UTR wild -type in U87MG cells, and miR-1288-mut demonstrated no effect on the luciferase activity of CYLD 3′-UTR wild-type in U87MG cells (Fig. 4C). Taken together, these results suggested that CYLD is a target of miR-1288.

To further determine the mechanism by which the miR-1288-CYLD axis regulates cell proliferation of GBM, the expression of cell proliferation-associated genes were measured. Decreased cyclin D1 and MYC expression were detected after treatment with the miR-1288 by RT-qPCR and western blot analysis (Fig. 4D and E, respectively). Collectively, these results indicated that miR-1288 functionally modulates the cellular proliferation regulators cyclin D1 and MYC; thus, may mediate GBM cell proliferation.

Silencing of CYLD expression reversed the cell proliferation promotion by miR-1288-in in GBM

The present study hypothesized that the phenotypes associated with miR-1288-in expression would be reversed by the silencing of CYLD expression. CYLD expression was confirmed by western blotting (Fig. 5A). Colony formation and anchorage-independent growth assays demonstrated that knockout of CYLD expression significantly reversed the miR-1288-in-induced promotion of GBM cell proliferation (Fig. 5B and C). Taken together, these results indicated that CYLD serves an essential role in cell proliferation of GBM, potentially acting as a mediator of miR-1288.

Discussion

The results of the present study revealed the following novel findings: i) miR-1288 was upregulated in GBM; ii) in vitro experiments confirmed that miR-1288 overexpression promoted cell proliferation of GBM; iii) miR-1288 targeted CYLD in GBM cells and cells negatively expressing CYLD.

Previous studies have demonstrated that miRNAs serve essential roles in tumor development and progression of various types of cancer by targeting genes associated with cell proliferation, apoptosis, invasion, migration and angiogenesis (3,1216). miR-146b-5p serves as a tumor suppressor and predicts the prognosis of human gliomas (17). miR-182-5p was reported to promote tumorigenesis of glioma by inducing STAT3 activation (18). Guo et al (19) indicated that miR-141 and miR-200c inhibit glioma cell growth and migration by suppressing zinc finger E-box-binding homeobox 1 expression. In particular, the function of miR-1288 and its regulated targets in GBM remains unknown. The present study demonstrated that expression of miR-1288 was significantly upregulated in GBM tissues and cells.

miR-1288 has previously been reported to be associated with pathological staging and serve an essential role in the progression of colorectal cancer (9). Gopalan et al (20) demonstrated that miR-1288 expression was upregulated in oesophageal squamous cell carcinoma tissues, and overexpression of miR-1288 promoted cell proliferation, migration and invasion of oesophageal squamous cell carcinoma. Similarly, the present study indicated that overexpression of miR-1288 could promote cell proliferation of GBM in vitro.

CYLD, a mutated gene in familial cylindromatosis, is known to serve as tumor suppressor gene in multiple types of cancer by regulating various signaling pathways, including Wnt/β-catenin, nuclear factor-κB and transforming growth factor-β (2125). In the present study, CYLD was demonstrated to serve as a functional target of miR-1288, using a bioinformatics prediction. Western blotting and a dual-luciferase reporter assay were used to verify that miR-1288 targets CYLD by interacting with the 3′UTR of CYLD to reduce CYLD expression. Further functional experiments revealed that the suppression of CYLD reversed the cell proliferation promotion by miR-1288-in in GBM.

In conclusion, the present study demonstrated that miR-1288 expression was increased in GBM. miR-1288 was identified as a tumor promoter in GBM by inhibiting of CYLD, suggesting that the miR-1288/CYLD axis may represent a potential therapeutic target for the treatment of GBM.

Acknowledgements

The present study was supported by the Department of Radiation Oncology, Sichuan Cancer Hospital (Sichuan, China) and the Research project of Sichuan Provincial Health and Family Planning Commission (grant no. 16PJ511).

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November-2017
Volume 16 Issue 5

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Spandidos Publications style
Yin J, Weng C, Ma J, Chen F, Huang Y and Feng M: MicroRNA‑1288 promotes cell proliferation of human glioblastoma cells by repressing ubiquitin carboxyl‑terminal hydrolase CYLD expression. Mol Med Rep 16: 6764-6770, 2017.
APA
Yin, J., Weng, C., Ma, J., Chen, F., Huang, Y., & Feng, M. (2017). MicroRNA‑1288 promotes cell proliferation of human glioblastoma cells by repressing ubiquitin carboxyl‑terminal hydrolase CYLD expression. Molecular Medicine Reports, 16, 6764-6770. https://doi.org/10.3892/mmr.2017.7481
MLA
Yin, J., Weng, C., Ma, J., Chen, F., Huang, Y., Feng, M."MicroRNA‑1288 promotes cell proliferation of human glioblastoma cells by repressing ubiquitin carboxyl‑terminal hydrolase CYLD expression". Molecular Medicine Reports 16.5 (2017): 6764-6770.
Chicago
Yin, J., Weng, C., Ma, J., Chen, F., Huang, Y., Feng, M."MicroRNA‑1288 promotes cell proliferation of human glioblastoma cells by repressing ubiquitin carboxyl‑terminal hydrolase CYLD expression". Molecular Medicine Reports 16, no. 5 (2017): 6764-6770. https://doi.org/10.3892/mmr.2017.7481