Abstract: Objective： To investigate the effect of macrophage-capping protein (CapG) on migration and proliferation of human gastric cancer cell line. Methods: Realtime PCR method was used to detect the expression of CapG gene in four gastric cancer cell lines, and AGS cells with low expression and transfection were selected as the research objects. Specific primers were designed for CapG and recombinant plasmids synthesized. A lentivirus packaging system which could express CapG was constructed, and a cell line stably expressing CapG was established by infecting human gastric cancer cell line AGS cells. The effect of overexpression of CapG gene on the growth and proliferation of AGS cells was analyzed by CCK8 assay. Cells cratch and Transwell assay were used to analyze the effect of overexpression of CapG gene on AGS cell migration. Results: After the overexpression of CapG, the growth rate of AGS cells was slightly lower than that of the control group, but there was no significant difference between the two groups (t=2.424, P=0.073). Scratch test showed that the average narrowing distance of the scratches in the CapG experimental group was significantly reduced compared with the control group, the average narrowing distance of the CapG experimental group and the control group was 336.99 μm and 45.54 μm, the difference was statistically significant (t=14.97, P=0.004). The average number of cell penetra-ting membrane in the CapG experimental group and the eGFP control group was 176 and 70, the number of the cells in the CapG experimental group was significantly higher than that of the control group (t=40.00, P<0.001). Conclusion: The overexpression of CapG gene has no significant effect on the growth and proliferation of AGS cells of gastric cancer cell line. Overexpression of CapG gene can promote the migration of AGS cells of gastric cancer cell lines.

Key words: Macrophage-capping protein, Stomach neoplasms, Cell line, tumor, Cell proliferation, Cell movement