Activation of p70S6K induces expression of matrix metalloproteinase 9 associated with hepatocyte growth factor-mediated invasion in human ovarian cancer cells.
The expression of hepatocyte growth factor (HGF) receptor, encoded by the Met oncogene, is elevated in ovarian and a variety of cancers. Here we show that human ovarian cancer cells with high Met expression were more sensitive to the cell motility and invasion effect of HGF. Met down-regulation by small interfering RNAs or K252a resulted in reduced migration in response to HGF. The invasive/migratory phenotype activated by HGF can be blocked by specific inhibitors of the phosphatidylinositol-3-kinase (PI3K) cascade, inhibitor of p70(S6K), and also the expression of a dominant-negative Akt, demonstrating that HGF transmits the motogenic signal through PI3K and Akt to p70(S6K). A significant role for p70(S6K) in cell invasion is further supported by the observation that expression of constitutively active forms of p70(S6K) is sufficient to induce invasive and migratory phenotypes in ovarian cancer cells. Importantly, activation of p70(S6K) stimulated expression and proteolytic activity of matrix metalloproteinase (MMP)-9 and cellular invasion, whereas it had little effect on MMP-2, suggesting for the first time that MMP-9 up-regulation by p70(S6K) as a key step for HGF-induced invasion and migration. These data suggest that interfering p70(S6K) may provide a novel means of controlling tumor cell invasiveness.
Department of Zoology, The University of Hong Kong, China.
Hong Y
HY
Zhou
Alice S T
AS
Wong
D000111:Acetylcysteine / Q000378:metabolism; D015153:Blotting, Western; D045744:Cell Line, Tumor; D002465:Cell Movement; D015536:Down-Regulation; D004789:Enzyme Activation; D005109:Extracellular Matrix / Q000378:metabolism; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D015972:Gene Expression Regulation, Neoplastic; D017228:Hepatocyte Growth Factor / Q000378:metabolism*; D006801:Humans; D015151:Immunoblotting; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D015233:Models, Statistical; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D009474:Neurons / Q000378:metabolism; D010051:Ovarian Neoplasms / Q000378:metabolism*; D010641:Phenotype; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010766:Phosphorylation; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000737:chemistry; D020133:Reverse Transcriptase Polymerase Chain Reaction; D038762:Ribosomal Protein S6 Kinases, 70-kDa / Q000378:metabolism*; D015398:Signal Transduction; D013997:Time Factors; D014162:Transfection
D011994:Recombinant Proteins; D017228:Hepatocyte Growth Factor; D019869:Phosphatidylinositol 3-Kinases; D038762:Ribosomal Protein S6 Kinases, 70-kDa; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D000111:Acetylcysteine