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- W2020105154 abstract "We investigated whether proteasomes were involved in the invasiveness of oral squamous cell carcinoma (SCC) cells. The migration of SCC cells through a gelatin-coated membrane was enhanced with tumor necrosis factor alpha (TNF alpha), which was strongly inhibited by a peptide aldehyde, N-acetyl-Leu-Leu-norleucinal (ALLN), but not by its structurally related compound, N-acetyl-Leu-Leu-methioninal (ALLM). Since ALLN is a more potent inhibitor against proteasomal proteolysis than ALLM, cell migration inhibited by ALLN may thus likely depend on proteasomes. The TNF alpha-induced migration through gelatin appeared to be associated with the gelatinolytic activity from the cells, since TNF alpha strongly enhanced the production of matrix metalloproteinase (MMP)-9/gelatinase B in the SCC cells, as detected by gelatin zymography. The production of MMP-9 was also inhibited by pretreatment with ALLN, but not ALLM, in a dose-dependent manner. Moreover, ALLN could block the activation and nuclear translocation of a transcription-activating factor, NF-kappaB, which is known to regulate MMP-9 expression in TNF alpha-stimulated SCC cells. The TNF alpha-induced degradation of IkappaB alpha was also suppressed by ALLN treatment, thus implying that the molecule linking proteasome to MMP-9 production should be IkappaB alpha. We finally reconfirmed the involvement of proteasomes in the invasive behavior of oral SCC using lactacystin, a specific proteasome inhibitor, which could prevent TNF alpha from enhancing MMP-9 production, NF-kappaB activation, induction of MMP-9 mRNA and cell migration." @default.
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- W2020105154 date "1998-08-12" @default.
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- W2020105154 title "Involvement of proteasomes in migration and matrix metalloproteinase-9 production of oral squamous cell carcinoma" @default.
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- W2020105154 doi "https://doi.org/10.1002/(sici)1097-0215(19980812)77:4<578::aid-ijc18>3.0.co;2-2" @default.
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