TMPRSS4 promotes invasiveness of human gastric cancer cells through activation of NF-κB/MMP-9 signaling
Abstract
Transmembrane protease serine 4 (TMPRSS4) is a type-II transmembrane serine protease that is frequently upregulated in human cancers. However, little is known about the biological roles of TMPRSS4 in gastric cancer. In this study, we examined the effect of TMPRSS4 on gastric cancer cell proliferation, migration, and invasion. The expression and secretion of matrix metalloproteinase-9 (MMP-9) and activation of nuclear factor-κB (NF-κB) were determined. The involvement of NF-κB/MMP-9 signaling was checked. Our data showed that TMPRSS4 silencing significantly (P<0.05) reduced the migration and invasion of AGS and MKN-45 gastric cancer cells, without affecting cell proliferation. Overexpression of TMPRSS4 significantly promoted cell migration and invasion. The expression and secretion of MMP-9 was significantly (P<0.05) enhanced in TMPRSS4-overexpressing cells. TMPRSS4-overexpressing cells had a significantly (P<0.05) lower level of IκBα and higher level of nuclear NF-κB. Luciferase reporter assay confirmed that overexpression of TMPRSS4 resulted in a 3-5-fold increase in NF-κB-dependent luciferase activity. Downregulation of MMP-9 significantly (P<0.05) reversed the invasiveness of gastric cancer cells induced by TMPRSS4 overexpre...Continue Reading
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Celastrol inhibits migration and invasion through blocking the NF-κB pathway in ovarian cancer cells
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