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Globally, gastric cancer is the second-greatest cause of cancer death. ARHGAP18 belongs to the Rho family of GTPases which is involved in cellular migration, invasion, and growth phases. The aim of the present study was to investigate whether ARHGAP18 could regulate cell proliferation, migration, invasion, and related molecular mechanisms in gastric cancer. Cell Counting Kit-8 (CCK-8) assay results showed that following transfection of a recombinant plasmid, over-expression of ARHGAP18 inhibited cell viability in MGC-803 and BGC823 cells. Using in vitro transwell analysis, migration and invasion abilities were significantly inhibited in cells with high ARHGAP18 expression. Phosphorylation levels of ERK, JNK, and p38 by Western blot analysis significantly declined after transfection of cells with the ARHGAP18 plasmid. Expression levels of ROCK, MTA1, and MMP-2/9 were detected by real-time polymerase chain reaction and Western blotting, and over-expression of ARHGAP18 decreased the expression levels of ROCK, MTA1, and MMP-9. A further in vivo tumor formation study in nude mice indicated that over-expression of ARHGAP18 delayed the progress of tumor formation. These results indicate that ARHGAP18 could act as a tumor suppressor and may serve as a promising therapeutic strategy for gastric cancer.

oncotargets and therapy

Over-expression of &lt;em&gt;ARHGAP18&lt;/em&gt; suppressed cell proliferation, migration, invasion, and tumor growth in gastric cancer by restraining over-activation of MAPK signaling pathways