MiR-182-5p improves the viability, mitosis, migration, and invasion ability of human gastric cancer cells by down-regulating RAB27A.

Yuling Li,Shudong Chen,Zhengfei Shan,Liyan Bi,Sen Xu,Yongwei Li,Shengqiang Yu

doi:10.1042/bsr20170136

Yuling Li, Shudong Chen + Show 5 more

Open Access

https://doi.org/10.1042/bsr20170136

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Abstract

We investigated the effect of miR-182-5p on the viability, proliferation, invasion, and migration ability of human gastric cells by regulating the expression of RAB27A. Real-time PCR assay was used to detect the expression of miR-182-5 and RAB27A in human gastric carcinoma tissues, para-carcinoma tissues, and different cell lines. Western blotting was also used to determine the RAB27A expression in both tissues and cell lines. We chose the HGC-27 cell line as experiment subject as it demonstrated the highest miR-182-5p level. HGC-27 cells were transfected with different vectors and the cell viability, mitosis, invasion, and migration ability were measured through MTT assay, flow cytometry (FCM) analysis, Transwell assay, and wound healing assay. In comparison with the normal tissues, miR-182-5p is expressed at a higher level in gastric cancer (GC) tissues, while RAB27A is expressed at a lower level in cancerous tissues. The down-regulation of miR-182-5p and up-regulation of RAB27A can significantly decrease the viability, migration, invasion, and mitosis of HGC-27 cells. The target relationship between miR-182-5p and RAb27A was confirmed through a dual-luciferase reporter gene assay and Western blot assay. miR-182-5p enhances the viability, mitosis, migration, and invasion of human GC cells by down-regulating RAB27A.

Highlights

Gastric cancer (GC) is one of the most common malignant tumors of the digestive system, has an estimated 951,600 new cases and causes 723,100 deaths every year [1]
We found that the expression of RAB27A mRNA in GC tissues was much lower than that in adjacent tissues (P
MiR-182-5p was found up-regulated in the four GC cell lines (HGC-27, MKN-45, SGC-7901, and MGC-803) in comparison with normal gastric epithelial cells (GES)

Summary

Introduction

Gastric cancer (GC) is one of the most common malignant tumors of the digestive system, has an estimated 951,600 new cases and causes 723,100 deaths every year [1]. The causes for GC are complex and may include factors such as an unbalanced diet, smoking, alcohol, and infection of the Helicobacter pylori [2]. The 5-year survival rate is less than 30% [4,5,6]. Gene-based drug therapy is a potential approach for GC treatment [9]. Due to the lack of understanding of the molecular mechanisms behind GC development, there is currently no effective therapy for GC [10]

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