ABSTRACT
【Objective】 To observe the effects of hsa-miR-124-3p.1 in inhibiting epithelial-mesenchymal transition （EMT）， migration and invasion of human gastric cancer cells induced by transforming growth factor β1 （TGF-β1） by targeting tumor necrosis factor receptor-associated factor 6 （TRAF6）. 【Methods】 A total of 43 gastric cancer tissues and 43 normal para-carcinoma tissues were collected. The human gastric mucosal epithelial cells GES-1 and gastric cancer cells （NCI-N87， MGC-803， BGC-823， SGC-7901， and MKN-45） were cultured. The expressions of miR-124-3p.1 and TRAF6 in tissues and cells were detected by fluorescent quantitative PCR and Western blotting. The targeted relationship between miR-124-3p.1 and TRAF6 was verified by dual-luciferase reporter gene system assay. SGC-7901 cell lines with miR-124-3p.1 and TRAF6 overexpression were constructed. The cells were induced by TGF-β1. The invasion and migration abilities of the cells were evaluated by Transwell chamber assay and scratch test. 【Results】 Compared with normal para-carcinoma tissues and normal gastric mucosal cells， the expression of miR-124-3p.1 was downregulated， while the expressions of TRAF6 mRNA and protein were upregulated in gastric cancer tissues and cells （P<0.05）. Compared with control group， expression of E-cadherin in cells was downregulated， expressions of N-cadherin and Vimentin were upregulated， invasion and migration rates of cells were increased in TGF-β1 group （P<0.05）. Compared with TGF-β1 group， after cells were transfected with miR-124-3p.1 mimic， the expression of E-cadherin was upregulated， the expressions of N-cadherin and Vimentin were down-regulated， and invasion and migration rates of cells were decreased （P<0.05）. Compared with miR-124-3p.1 mimic group， invasion and migration rates of cells were increased in TGF-β1+mimic+TRAF6 group， expressions of TRAF6， N-cadherin and Vimentin were up-regulated， and the expression of E-cadherin was down-regulated （P<0.05）. 【Conclusion】 hsa-miR-124-3p.1 is lowly expressed in gastric cancer. Overexpression of miR-124-33p.1 can inhibit EMT， cell invasion and migration induced by TGF-β1. And the action mechanism may be related to the downregulated expression of TRAF6.