Objective:   To investigate the effect of TGF-β1 on the migration and invasion of gastric cancer cells, by regulating fatty acid synthetase.

  Methods:   From January 2016 to December 2018, 54 paraffin samples were collected from Shunde Hospital of Southern Medical University. Immunohistochemistry was used to detect the expression of transforming growth factor β1 (TGF-β1) and fatty acid synthetase (FASN) in human gastric cancer tissues, and the correlation between them was analyzed. Transient transfection of TGF-β1 and TGF-β1 siRNA was used to construct gastric cancer cell lines. Real-time PCR was used to detect FASN mRNA level, and Western blot was performed to examine FASN protein level. Transient transfection of FASN siRNA was used to construct gastric cancer cell lines. Wound healing assays and Transwell assays were performed to observe the effect of migration and invasion ability of gastric cancer cells. Results: Immunohistochemical results indicated that the expression of TGF-β1 and FASN in gastric cancer tissue was significantly positively correlated. TGF-β1 overexpression plasmid transfection significantly up-regulated the expression level of FASN mRNA and protein, whereas TGF-β1 siRNA significantly inhibited the expression of FASN. After co-transfection with FASN siRNA, TGF-β 1-induced N- cadherin protein expression was reduced and E- cadherin protein expression was enhenced. Scratch and Transwell experiments showed that the increased cell migration and invasion by TGF-β1 were significantly decreased.

  Conclusions:   FASN plays an important role in the migration and invasion of gastric cancer cells regulated by TGF-β1.