Molecular mechanism for LINC01426 to regulate gastric cancer cell proliferation, migration, and invasion

BACKGROUND

The pathogenesis of gastric cancer is complex, among which the dysregulation of expression of oncogenes and tumor suppressor genes is a key factor. MiR-153-5p has been confirmed to have a tumor suppressor effect in liver cancer, and antisense noncoding RNA in the INK4 locus (ANRIL) can promote liver cancer cell migration. However, whether long intergenic non-coding RNA 01426 (LINC01426) targets miR-153-5p and participates in the progression of gastric cancer remains to be studied.

AIM

To investigate whether LINC01426 targets miR-153-5p to affect the proliferation, migration, and invasion of gastric cancer cells.

METHODS

Real-time quantitative PCR (RT-qPCR) was used to analyze the expression of LINC01426 and miR-153-5p in gastric cancer tissues, tumor adjacent tissues, gastric cancer cell lines (SNU-1, AGS, and HS-746T), and normal gastric epithelial cells (GES1). The correlation of LINC01426 and miR-153-5p expression in gastric cancer tissues was analyzed by Pearson correlation. Online bioinformatics analysis, dual luciferase reporter assay, and RT-qPCR were applied to confirm the regulatory effect of LINC01426 on miR-153-5p. The effect of LINC01426 and miR-153-5p expression on cell viability, migration, and invasion was evaluated by MTT and transwell assays.

RESULTS

LINC01426 was highly expressed in gastric cancer tissue and cells compared with tumor adjacent tissue and GES1 cells (P < 0.05), but miR-153-5 was lowly expressed in gastric cancer tissue and cells (P < 0.05). Pearson correlation analysis showed that the expression of LINC01426 and miR-153-5p in gastric cancer tissues was negatively correlated (r = -0.828, P < 0.05). LINC01426 could target and negatively regulate miR-153-5p. LINC01426 inhibition or miR-153-5p overexpression remarkably reduced the proliferation, migration, and invasion of SNU-1 cells (P < 0.05), while miR-153-5p inhibition had opposite effects (P < 0.05). The effects of LINC01426 inhibition on the proliferation, migration, and invasion of SNU-1 cells were significantly reversed by inhibiting miR-153-5p (P < 0.05).

CONCLUSION

Inhibition of LINC01426 could hinder the proliferation, invasion, and migration of gastric cancer cells, which is related to the negative regulation of miR-153-5p by LINC01426.

LINC01272 activates epithelial-mesenchymal transition through miR-153-5p in Crohn's disease

OBJECTIVES

Long noncoding RNAs (lncRNAs) have different functions in different diseases. There is little research on the functions of lncRNAs in Crohn's disease (CD). By using RNA-seq technology, we identified a lncRNA associated with Crohn's disease. However, the mechanism of lncRNA regulation remains unknown. This study aimed to determine the association of LINC01272 with epithelial cell-mesenchymal transition and the underlying mechanism in CD.

METHODS

RNA was detected by qRT-PCR. The interaction of protein and RNA was determined by RNA binding protein immunoprecipitation. Luciferase reporter assays were used to detect the targeted miRNA of LINC01272. Tissue fibrosis was observed by Masson and H&E staining. Protein expression was determined by western blotting and immunofluorescence.

RESULTS

LINC01272 was highly expressed in patients with CD. Knockdown of LINC01272 inhibited TGF-β1-induced epithelial-mesenchymal transition (EMT). Additionally, LINC01272 regulated TGF-β1-induced EMT through the miR-153-5p axis, and knockdown of LINC01272 inhibited EMT in CD mice in vivo.

CONCLUSION

LINC01272 activated the epithelial-mesenchymal transition through miR-153-5p in CD.

Upregulation of HOTAIRM1 increases migration and invasion by glioblastoma cells

Long noncoding RNAs (lncRNAs) promote invasion and migration by glioblastoma (GBM) cells. In this study, quantitative real-time polymerase chain reaction was used to detect expression levels of the lncRNA HOTAIRM1 in GBM tissue samples and cells. The function of HOTAIRM1 was examined using wound healing assays, transwell assays, and in vivo experiments after GBM cells were transfected with either sh-ctrl or sh-HOTAIRM1. Luciferase reporter assays and RIP assays were performed to determine the interactions between HOTAIRM1 and miR-153-5p and between miR-153-5p and SNAI2. We also used luciferase reporter assays and ChIP assays to assess the transcriptional regulation of HOTAIRM1 by SNAI2 and CDH1. HOTAIRM1 was significantly overexpressed in GBM tissues and cells. HOTAIRM1 knockdown significantly weakened the migration and invasion by GBM cells. HOTAIRM1 was found to sponge miR-153-5p, and SNAI2 is a direct target of miR-153-5p. In addition, SNAI2 was shown to force HOTAIRM1 expression through directly promoting transcription and suppressing the negative regulation of CDH1 on transcription. Our results indicate a positive feedback loop between HOTAIRM1 and SNAI2, and suggest that the lncRNA HOTAIRM1 is a potential biomarker and therapeutic target in GBM.

Long Noncoding RNA HIF1A-AS2 Promotes Non-Small Cell Lung Cancer Progression by the miR-153-5p/S100A14 Axis

Background

Long noncoding RNA (lncRNA) plays a critical role in initiating lung cancer. This study aims to research the function and mechanism of lncRNA HIF1A-AS2 in regulating non-small cell lung cancer (NSCLC) progression.

Methods

qRT-PCR was used to analyze gene expression. The CCK-8 assay was performed to detect cell proliferation. The Transwell assay was conducted to examine cell migration and invasion. A Caspase3 activity detection kit was utilized to analyze apoptosis. The luciferase reporter assay was carried out to research interactions of HIF1A-AS2, miR-153-5p and S100A14.

Results

HIF1A-AS2 expression was raised in NSCLC tissues and cell lines. The HIF1A-AS2 level was increased in advanced NSCLC tumor tissues. High HIF1A-AS2 expression was related to poor prognosis. HIF1A-AS2 knockdown decreased proliferation, migration and invasion while promoting apoptosis. HIF1A-AS2 was the sponge for miR-153-5p, and miR-153-5p targeted S100A14. HIF1A-AS2 promoted S100A14 expression through regulating miR-153-5p.

Conclusion

The HIF1A-AS2/miR-153-5p/S100A14 axis plays a crucial role in promoting NSCLC progression.

MiR-153-5p Enhances the Sensitivity of Triple-Negative Breast Cancer Cells to Paclitaxel by Inducing G2M Phase Arrest

Background

Paclitaxel (PTX) resistance is a main obstacle for the treatment of triple-negative breast cancers (TNBC). Evidences have shown that miR-153-5p could induce the apoptosis of breast cancer cells. Thus, this study aimed to investigate the effect of miR-153-5p on PTX-resistance TNBC cells.

Methods

Cell Counting Kit-8, flow cytometry and wound healing assays were used to detect the viability, apoptosis and migration of MDA-MB-231/PTX cells, respectively. The luciferase reporter assay was used to explore the potential binding targets of miR-153-5p. The expressions of CDK1, cyclin B1 and p-Akt in MDA-MB-231/PTX cells were detected with Western blot. In vivo animal study was performed finally.

Results

In this study, the inhibitory effects of PTX on the proliferation and migration of MDA-MB-231/PTX cells were significantly enhanced following transfection with miR-153-5p. In addition, overexpression of miR-153-5p markedly enhanced the pro-apoptotic effect of PTX on MDA-MB-231/PTX cells. Luciferase reporter assay validated that cyclin-dependent kinase 1 (CDK1) was a potential binding target of miR-153-5p. Moreover, overexpression of miR-153-5p prominently increased PTX-induced cell cycle arrest at G2/M phase in MDA-MB-231/PTX cells via downregulation of CDK1, cyclin B1 and p-Akt. In vivo experiments confirmed that overexpression of miR-153-5p notably enhanced PTX sensitivity in MDA-MB-231/PTX xenograft model.

Conclusion

We found that overexpression of miR-153-5p could reverse PTX resistance in PTX-resistant TNBC cells via inducing G2/M phase arrest, indicating that miR‑153-5p may be a promising agent for patients with PTX-resistant TNBC.

MiR-153-5p promotes sensibility of colorectal cancer cells to oxaliplatin via targeting Bcl-2-mediated autophagy pathway

Oxaliplatin (L-OHP) is one of the effective chemotherapeutic drugs for colorectal cancer (CRC). Further investigation into the molecular mechanism of chemoresistance could improve outcomes for patients with colorectal cancer. Recently, microRNAs have been reported as a key in drug resistance of tumors. In this study, we aimed to investigate the effects of miR-153-5p in L-OHP-resistant CRC cells, and its underlying mechanism. Downregulation of miR-153-5p was observed in CRC cells, while upregulation of miR-153-5p enhances the chemosensitivity of CRC/L-OHP cells. The autophagy of CRC/L-OHP cells was markedly increased after exposure to L-OHP but abolished by the upregulation of miR-153-5p. Dual-luciferase reporter assays validated that Bcl-2 was a direct target of miR-153-5p. In conclusion, our data suggested that miR-153-5p was a mediator of cisplatin resistance in colorectal cancer by affecting Bcl-2-mediated autophagy, indicating a new therapeutic target for CRC treatment.

LncRNA CDKN2BAS predicts poor prognosis in patients with hepatocellular carcinoma and promotes metastasis via the miR-153-5p/ARHGAP18 signaling axis

Background: Growing evidence shows that long noncoding RNAs (lncRNAs) play a crucial role in cancer progression. However, whether lncRNA CDKN2BAS is involved in human hepatocellular carcinoma (HCC) metastasis remains unclear.

Methods: Human lncRNA microarray analysis was performed to detect differential expression levels of lncRNAs in metastatic HCC tissues. Effects of CDKN2BAS on cell proliferation, migration, and apoptosis were determined by MTT assay, colony formation assay, migration assay, scratch assay, and flow cytometry. The xenograft experiment was used to confirm the effect of CDKN2BAS on HCC in vivo. qRT-PCR and Western blot were performed to determine the expression levels of mRNAs and proteins. Luciferase reporter assay was used to identify the specific target relationships.

Results: CDKN2BAS was remarkably up-regulated in metastatic HCC tissues compared with the adjacent non-tumor tissues. CDKN2BAS promotes HCC cell growth and migration in vitro and in vivo. Additionally, CDKN2BAS upregulated the expression of Rho GTPase activating protein 18 (ARHGAP18) by sponging microRNA-153-5p (miR-153-5p), and thus promoted HCC cell migration. Besides, CDKN2BAS downregulated the expression of Krüppel-like factor 13 (KLF13) and activated MEK-ERK1/2 signaling, thus reducing apoptosis in HCC cells.

Conclusions: Our study revealed that lncRNA CDKN2BAS promotes HCC metastasis by regulating the miR-153-5p/ARHGAP18 signaling.