Abstract
In the present study, we investigated the relationship between ornithine decarboxylase, MAP kinase, and MMP-2 expression in vitro. Overexpression of ornithine decarboxylase cDNA induced MMP-2 expression both at mRNA and protein levels. Promoter analysis and gel shift assay showed that p53 and Ets-1 were involved in MMP-2 expression in ornithine decarboxylase overexpressing transfectants. Erk and p38 MAP kinase were significantly activated. Using specific inhibitors of MEK and p38, we clarified that MMP-2 expression was induced via both Erk and p38 MAP kinase signaling pathways. This is the first report showing the existence of a causal relationship between ornithine decarboxylase expression, Erk and p38 MAP kinase activation, and MMP-2 expression.
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