Effects of down-regulation of tmnor-associated calcium signal transducer-2 gene expression by RNA interference on adhesion, migration and invasion of gastric cancer cells

Objective To study the effects of tumor-associated calcium signal transducer-2 (TROP-2) gene small interfering RNA (siRNA) on adhesion, migration, and invasion of human gastric cancer cells.Methods Real time polymerase chain reaction (PCR) was used to detect the TROP-2 mRNA expression of human gastric cancer cell lines MGC-803, HC, C-27 and BGC-823. The cells with highest expression of TROP-2 were transfected with different doses of TROP-2 siRNA. The expression of TROP-2 mRNA and protein was detected by real-time quantitative PCR and immumoflureseence method. Cell adhesion, migration,and invasion were exmined by hoyden chamber, respectively. Results Cell line BGC-823 showed the highest elevation of TROP-2 mRNA among three gastric cancer cell lines. Real-time quantitative PCR and immumoflurescence method revealed that the expression of TROP-2 mRNA and protein was reduced in a time- and dose-dependent manner ( r = 0. 935 ; r = 0. 922). The ability of adhesion, migration and invasion of BGC-823 cells treated with TROP-2 siRNA was decreased as compared with control group (P <0. 01 ). Conclusion TROP-2 gene might play an important role in adhesion, migration, and invasion of human gastric cancer cells, siRNA targeted TROP-2 could effectively inhibit adhesion, migration, and invasion of human gastric cancer cells. Key words: Gastric carcinoma; TROP-2; RNA interference; Invasion