Abstract
Aberrant expression of miRNAs has been reported to be involved in the development and progression of glioma. But the function of miR-876-3p in glioma is unknown. We found that miR-876-3p is significantly downregulated in glioma tissues and cell lines. Overexpression of miR-876-3p suppressed glioma cell proliferation, epithelial-mesenchymal transition, migration, and invasion. By prediction combining with luciferase reporter assay, we identified that miR-876-3p could decrease the expression of KIF20A by directly targeting the region of its 3’UTR. Furthermore, we observed that overexpression of miR-876-3p inhibited the expression of KIF20A, thus blocking the protein kinase JAK2/STAT3 pathway. Overexpressed KIF20A reversed miR-876-3p-induced suppression of glioma cell proliferation, migration, and invasion. We also demonstrated the inhibitory effect of miR-876-3p on tumor growth in glioma using an in vivo model. The miR-876-3p/KIF20A-axis mediated JAK2/STAT3 pathway have therapeutic potential in glioma treatment.
Keywords: Glioma, miR-876-3p, proliferation, EMT, KIF20A
Introduction
MiRNAs are a class of short single-strand non-coding RNAs, which length are about 19-25 nucleotides [1-3]. MiRNAs negatively regulate gene expression through gene translational repression by binding to the 3’ untranslated region (UTR) [4,5]. The aberrantly expression of miRNAs occur in various types of human cancers, which can act as tumor suppressors or promoters [6,7].
Kinesin family member 20A (KIF20A) is a member of the kinesin super family-6 [8,9]. Previous studies showed that KIF20A could play a important role in the development and progression of human cancers, including gastric [10], pancreatic cancer [11,12], breast cancer [13] and hepatocellular carcinoma [8]. In addition, KIF20A has been reported to be involved in proliferation, migration, invasion and angiogenesis [11,14]. Furthermore, KIF20A is a tumor-associated antigen involved in the glioma cell growth and cell survival [15,16].
Here, we determine whether miR-876-3p directly represses KIF20A expression, which leads to the subsequent inhibition of glioma cell proliferation, epithelial-mesenchymal transition (EMT) and in vivo tumor growth. In an exploration of the mechanism of miR-876-3p action, we demonstrate that dysregulation of miR-876-3p/KIF20A signalling activates the JAK2/STAT3 pathway.
Materials and methods
Cell lines and human tissue samples
Human glioma cell lines (U251, T98, U87, and LN229) were obtained from the Cell Bank of the Chinese Academy of Sciences (Shanghai, China). Normal human astrocytes (NHAs) were obtained from Lonza (Walkersville, MD, USA). Glioma cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) supplemented with 10% of fetal bovine serum (FBS) in a humidified incubator at 37°C and 5% CO2. NHAs were grown in the astrocyte growth media supplemented with rhEGF, insulin, L-glutamine, GA-1000, ascorbic acid and 5% FBS. MiRNA expression data was obtained from Chinese Glioma Genome Atlas (CGGA) database (http://www.cgga.org.cn/portal.php). Gene expression data was obtained from Cancer Genome Atlas (TCGA) database (http://tcga-data.nci.nih.gov). Nontumorous brain tissues (NBTs) and glioma tissues were obtained from the Department of Neurosurgery, Huai’an Hospital Affiliated to Xuzhou Medical University, Second People’s Hospital of Huai’an City. Of these 30 samples, 6 were NBTs, 12 were low-grade glioma samples (grade II, LGGs) and 12 were high-grade glioma samples (grade III and IV, HGGs). Written informed consent was obtained from all the patients.
RNA isolation and quantitative real-time PCR (qRT-PCR)
qRT-PCR were performed using Mir-XTM miRNA qRT-PCR SYBR® Kit (Takara) for miR-876-3p. The expression of U6 was used as an endogenous control. qRT-PCR was performed using TB GreenTM Fast qPCR Mix (Takara) for KIF20A. The expression of GAPDH was used as an internal control.
Cell transfection
Lentiviruses carrying hsa-miR-876-3p or its negative control were purchased from Genepharma (Shanghai, China). For over-expression of KIF20A, cells were transfected with KIF20A over-expressing recombinant vector (GenePharma, Shanghai, China). Stable cell lines were established by infecting U251 and T98 cells, which were collected for the experiments after 48 h of transfection.
Cell Counting Kit-8 assay
Cells (2 × 103) were seeded to 96-well plate. After incubation for 0, 1, 2, 3 and 4 days, 10 μL of CCK8 reagent was added to each well and cells were cultured for 4 h at 37°C. Then, cell proliferation was quantified by measuring the absorbance at 450 nm.
Colony information assay
Cells transfected with miR-876-3p or its negative control (500/well) were planted in a 6-well plate for about 2 weeks. Then, cells were fixed with ethanol and stained with crystal violet. Colonies with ≥ 50 cells were calculated as one colony.
Wound-healing assay
Cells transfected with the miR-876-3p or its negative control were seeded in 6-well plates. A linear wound was created with a plastic pipette tip. Cells were then cultured in serum-free medium and photographed under a microscope at oh and 48 h.
Transwell invasion assay
2 × 105 cells were seeded in the upper chambers of 24-well Transwell plates precoated with 10 μg of Matrigel (BD Biosciences, Franklin, NJ, USA). DMEM containing 10% FBS was added to the lower chamber. After incubation for 36 h, the cells on the upper chambers were removed. Invading cells on the bottom were fixed and stained with 1% crystal violet and photographed with microscope.
Three-dimensional spheroid assay
Cells were seeded at a 3 × 103 cells/ml density in 96-well ultra-low adherence plates. After 48 hours, these cells were induced to aggregate into a multicellular spheroid, and then matrigel was added into wells. After 48 h, motion of cells was confirmed as fully formed with microscopy.
Dual luciferase reporter assay
The wild-type (wt) 3’-UTR of the KIF20A sequence containing a binding site for miR-876-3p was amplified from a human cDNA library and cloned into the downstream region of the luciferase gene. The mutant (mt) 3’-UTR of KIF20A was created by mutating the seed region of the miR-876-3p-binding site. For reporter assay, cells were co-transfected with miR-876-3p and wild-type or mutant 3’UTR of KIF20A by Lipofectamine 3000. Renilla luciferase served for normalization.
Western blotting assay
Western blot assay was performed as described previously [17]. Antibodies against KIF20A (ab104118), Cyclin D1 (ab16663), CDK2 (ab32147), CDK4 (ab108357), Vimentin (ab195877), Fibronectin (ab2413), E-cadherin (ab40772), N-cadherin (ab18203), STAT3 (ab68153), p-STAT3 (ab76315), Actin (ab8227, Abcam); JAK2 (D2E12), and p-JAK2 (D15E2, Cell Signaling Technology) were used for western blotting assay.
Xenograft assay
U251 (1 × 106) cells stable expressing miR-876-3p or its negative control were subcutaneously injected into the flanks of nude mice of 6 weeks. Tumors volume were examined every 5 days. At 33 days after the injection, mice were killed. Tumor volume (mm3) = 1/2 × (length × width2). The study was approved by the Animal Care and Use Ethics Committee of Department of Neurosurgery, Huai’an Hospital Affiliated to Xuzhou Medical University, Second People’s Hospital of Huai’an City.
Statistical analysis
The results are presented as the means ± SEM. All the statistical analyses were conducted in the GraphPad Prism 5 software. The significance of the differences in variables were calculated using Student’s t test. P values < 0.05 were considered significant.
Results
Expression levels of miR-876-3p in human glioma tissues and cell lines
To investigate miR-876-3p expression in glioma, we initially analyzed its expression by database of CGGA (Grade II: 63; Grade III: 44 and Grade IV: 91). The expression of miR-876-3p was higher in low grade glioma tissues (grade II, LGGs) than that in high grade glioma tissues (grades III and IV, HGGs) (Figure 1A). Secondly, we detected miR-876-3p expression in 30 samples, including 6 NBTs, 12 LGG cases and 12 HGG cases by qRT-PCR. The expression of miR-876-3p was decreased observed in LGGs and HGGs compared with nontumorous brain tissues (NBTs) (Figure 1B). Thirdly, we investigated the expression of miR-876-3p in glioma cell lines (U251, T98, U87, and LN229) and normal human astrocytes (NHAs). Compared with NHAs, miR-876-3p was downregulated in glioma cells (Figure 1C). Then we chose a representative glioma specimen and NBTs for FISH analysis. Compared with NBTs, miR-876-3p was downregulated in glioma (Figure 1D).
MiR-876-3p suppresses glioma cell proliferation
To evaluate the effect of miR-876-3p on malignant biological behaviors in glioma, we stable transfected miR-876-3p or its negative control into glioma cells. The transfection efficiency was assessed by qRT-PCR (Figure 2A). CCK-8, colony formation assays were determined to exam the effects of miR-876-3p on glioma proliferation. Our results showed that overexpression of miR-876-3p significantly impaired the proliferation of both U251 and T98 cells compared its control (Figure 2B-D). To further understand the differences in cell proliferation, flow cytometry was performed to determine the cell cycle distribution. The results showed that overexpression of miR-876-3p cells resulted in G1 arrest (Figure 2E-G). To investigate the molecules of the cell cycle arrest, we measured the expression of cyclin-dependent kinases (CDKs; CDK2 and CDK4) and Cyclin D1 (CCND1) in cells transfected with miR-876-3p or its negative control by western blot (Figures 2H and S1).
MiR-876-3p suppresses glioma cell migration, invasion, and EMT
The wound-healing assay showed that miR-876-3p overexpression suppressed cell migration of glioma cell lines (Figure 3A and 3C). Similarly, the invasion ability of glioma cell significantly decreased after tranfected with miR-876-3p in the Transwell and Matrigel-based 3D invasion assays (Figure 3B, 3D and 3E). Next, we investigated the effect of miR-876-3p overexpression on EMT in glioma cells. Expression levels of the mesenchymal markers Vimentin, Fibronectin, and N-cadherin were downregulated, while those of E-cadherin were upregulated in miR-876-3p-overexpressing U251 or T98 cells (Figures 3F and S2). Thus, overexpression of miR-876-3p suppresses glioma cell migration and invasion.
KIF20A was a direct target of miR-876-3p
To further investigate the mechanism of miR-876-3p in the proliferation, migration, and invasion of glioma, the TargetScan and miRanda softwares were used to identify potential targets of miR-876-3p. KIF20A was identified as a potential effector of miR-876-3p (Figure 4A). To test whether miR-876-3p directly targets KIF20A, we inserted the target region sequence of the KIF20A 3’-UTR (WT) or the mutated sequence (MUT) into a luciferase reporter vector. As shown in Figure 4B, transfected miR-876-3p resulted in a decrease in the luciferase activity of the construct containing the wt 3’-UTR of KIF20A but had no effect on the mt 3’-UTR reporter. MiR-876-3p overexpression significantly decreased the expression of KIF20A in protein level, thus blocking the protein kinase JAK2/STAT3 pathway (Figures 4E and S3B). Additionally, we examined KIF20A mRNA level in TCGA database. The mRNA level of KIF20A in glioma tissues (GLIMAs) were upregulated compared with those in nontumorous brain tissues (NBTs) (Figure 4C). We examined the protein expression of KIF20A in 24 GLIMAs and 6 NBTs. We found that protein expression of KIF20A was higher expressed in GLIMAs than NBTs (Figures 4D and S3A).
KIF20A attenuates the effects of miR-876-3p on glioma cell proliferation, migration, and invasion
To further determine whether miR-876-3p functionally targets KIF20A, we transfected KIF20A into miR-876-3p overexpressing glioma cells. The expression levels of p-JAK2 and p-STAT3 recovered after exogenous introduction of KIF20A (Figures 5A and S4). Furthermore, transfected with KIF20A significantly attenuated the miR-876-3p-induced suppression of glioma cell proliferation, migration, and invasion (Figure 5B-G). These results indicate that KIF20A was a direct target gene through which miR-876-3p suppressed the migration and invasion of glioma cells.
The function of miR-876-3p is proved in orthotopic and subcutaneous nude mice model
To future prove the function of miR-876-3p, a xenograft model was constructed. U251 cells transfected with miR-876-3p and its negative control were subcutaneously inoculated into nude mice. Overexpression of miR-876-3p inhibited the glioma growth in vivo, as revealed by measuring the tumors volume and tumors weight (Figure 6A-C). In addition, overexpression of miR-876-3p downregulated protein levels of KIF20A, p-JAK2, and p-STAT3, which consistent with the results in vivo (Figures 6D and S5). Altogether, these findings indicate that miR-876-3p suppresses the progression and development of glioma in vivo.
Discussion
Glioma is the most common tumor in the central nervous system of human, which outcome is poor [18-20]. Previous studies have demonstrated that miRNAs play important roles in glioma initiation and progression as tumor promoter or suppressor [21,22]. Therefore, exploring the molecular and cellular mechanism of glioma-related miRNAs is the key to improve the treatment of glioma. In this study, we detected miR-876-3p expression and the function in glioma for the first time. We determined that miR-876-3p was significantly down-regulated in glioma samples and cells. Then, we revealed the function of miR-876-3p in glioma cell proliferation, cell cycle distribution, migration, invasion and EMT. The results showed that upregulated miR-876-3p suppressed cell growth, migration, invasion, induced G1 cell cycle arrest. These data suggest that miR-876-3p functions as a tumor suppressor in glioma.
KIF20A is a microtubule-associated motor protein, which is a member of the kinesin superfamily-6. Previous studies showed that KIF20A may involve in the development and progression of cancers, including pancreatic cancer [23], hepatocellular carcinoma [8,24], and breast cancer [13]. In addition, KIF20A expression was found to be associated with poor oncologic outcome.
JAK/STAT pathway is one of the most significant and active signalling pathways in cells which plays an important role in many physiological processes, such as cell growth, differentiation, and immune function [25,26]. More and more studies have found the abnormal activation of the JAK/STAT signaling pathway in various tumor tissues. Additionally, previous studies showed that inhibition of JAK2/STAT3 pathway could suppress migratory, invasive potential and EMT in some cancers [27,28].
The functions of microRNA are associated with its target genes. In the further mechanistic study, we first predicted the downstream target gene of miR-876-3p by TargetScan and miRanda softwares. Here, we showed that mRNA and protein expression of KIF20A was upregulated in glioma samples. Additionally, the luciferase assay was conducted to determine the targeting of miR-876-3p to the 3’UTRs of KIF20A. We observed that miR-876-3p-mediated downregulation of KIF20A inactivates the JAK2/STAT3 pathway in glioma cells. Furthermore, overexpression of KIF20A reversed the miR-876-3p-induced inhibition of JAK2/STAT3 pathway and suppression of glioma cell proliferation, migration, and invasion. These results suggested that miR-876-3p reduced glioma cell proliferation, migration, and invasion by targeting KIF20A. Then, we confirmed that overexpression of miR-876-3p inhibits the development and progression of xenograft tumors in vivo.
In summary, miR-876-3p downregulation plays an important role in the progression and malignancy of glioma. miR-876-3p is a critical repressor of KIF20A. Understanding the dysregulation of miR-876-3p/KIF20A stimulated JAK2/STAT3 pathway in glioma is important to improve our knowledge of the biological basis of glioma development and progression and has therapeutic potential treatment in glioma.
Disclosure of conflict of interest
None.
Supporting Information
References
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