LYN′s effects on the migration and invasion of gastric cancer cells through Wnt/ β-catenin signaling pathway / 国际外科学杂志

ABSTRACT

Objective:To explore the effects of LYN on the biological behaviors of gastric cancer cells, such as migration and invasion, and analyze the regulatory mechanism of Wnt/ β-catenin signaling. Methods:Gastric and paracancerous tissue samples from gastric cancer patients admitted to the Affiliated Hospital of Chengde Medical University from Oct. 2017 to May 2018 were selected to detect the expression level of LYN in clinically collected gastric cancer and paracancerous tissue samples by qRT-PCR.Gastric cancer AGS cells were used as experimental subjects, and shRNA-LYN was transfected into gastric cancer AGS cells using Lipofectamine 2000 as experimental group (Sh-LYN group), and untransfected cells as control group (NC group). LYN mRNA expression in AGS cells before and after transfection was detected by qRT-PCR.Transwell detected cell migration and invasion. Cell apoptosis was detected by TUNEL.Western Blot analysis was performed to detect proteins related to the Wnt/β-catenin signaling pathway and to study its regulatory mechanism.Measurement data were expressed as ( Mean± SD), and independent sample t test was used for comparison between the two groups. P<0.05 was considered statistically significant. Results:LYN mRNA expression was significantly up-regulated in gastric cancer tissues ( t=11.04, P<0.001).Sh-LYN transfected gastric cancer cells could make LYN protein expression lower than that of the normal control group( F=961.26, P=0.016).After transfection, migration and invasion of cells in the sh-LYN group were inhibited, and the apoptosis rate of cells in the sh-LYN group was significantly higher than that in the normal control group ( t=3.437, 4.450, P=0.011, 0.026) .Western Blot results: sh-LYN reduced the expression of Wnt3 and β-catenin significantly when compared with the normal control group.The detection of downstream proteins showed that after LYN knockdown, the expression of EMT epithelial labeled E-cadherin was increased, and EMT mesenchymal labeled N-cardherin and vimentin were down-regulated. The other related proteins snail 1 and snail 2 were also down-regulated. Conclusion:LYN knockdown inhibits migration and invasion of gastric cancer cells and induces apoptosis in gastric cancer cells, a process associated with the Wnt/ β-catenin signaling pathway.