OncoTargets and Therapy (Sep 2019)
Epigenetics mechanisms mediate the miR-125a/BRMS1 axis to regulate invasion and metastasis in gastric cancer
Abstract
Jianbo Xiong,1,* Yi Tu,2,* Zongfeng Feng,1,* Daojiang Li,3 Zhouwen Yang,1 Qiuxia Huang,4 Zhengrong Li,1 Yi Cao,1 Zhigang Jie1 1Department of Gastrointestinal Surgery, First Affiliated Hospital, Nanchang University, Nanchang 330006, Jiangxi Province, People’s Republic of China; 2Department of Pathology, First Affiliated Hospital, Nanchang University, Nanchang 330006, Jiangxi Province, People’s Republic of China; 3Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, Hubei Province, People’s Republic of China; 4Department of Nursing, First Affiliated Hospital, Nanchang University, Nanchang 330006, Jiangxi Province, People’s Republic of China*These authors contributed equally to this workCorrespondence: Zhigang Jie; Yi CaoDepartment of Gastrointestinal Surgery, First Affiliated Hospital, Nanchang University, No.17 Yongwai Zheng Road, Nanchang 330006, Jiangxi Province, People’s Republic of ChinaTel +86 7 918 869 2522Email [email protected]; [email protected]: Altered expression of breast cancer metastasis suppressor 1 (BRMS1), is a tumor suppressor, which is found in many types of cancers, including gastric cancer (GC), but the mechanism by which BRMS1 inhibits invasion and metastasis in GC is unknown. The aim of the study was to investigate the molecular mechanisms of miR-125a/BRMS1 in GC.Materials and methods: The expression of BRMS1 and miR-125a were detected by quantitative real-time PCR (qRT-PCR) and analyzed by bioinformatics. BSP and MSP were used to detecte the methylation status of miR-125a and BRMS1 which was treated by 5-Aza or not. Western Blot and qRT-PCR were used to analyze the expression of BRMS1 and EZH2. Transwell was performed to explore the invasion and metastasis ability of GC cells. The nude mice were used for the tumor formation assay.Results: BRMS1 may be regulated by copy number variation (CNV), methylation and miR-125a-5p. As one of the essential components of PRC2, EZH2 is an important regulatory factor resulting in the low expression of miR-125a. An epigenetic mechanism mediates the miR-125a/BRMS1 axis to inhibit the invasion and metastasis of GC cells. In vivo experiments, it is also showed that BRMS1 is involved in invasion and metastasis but not the proliferation in GC.Conclusion: These studies shed light on the mechanism of BRMS1 inhibition of GC invasion and metastasis and the development of new drugs targeting the miR-125a/BRMS1 axis, which will be a promising therapeutic strategy for GC and other human cancers.Keywords: gastric cancer, miR-125a/BRMS1 axis, epigenetic, EZH2, invasion and metastasis
