
pmid: 16455654
Hepatocyte growth factor (HGF)/c-Met signaling is thought to be a key pathway in both melanocyte development and melanoma metastasis. Here, HGF stimulation of melanocytes was seen to up-regulate c-Met expression. In an effort to decipher the mechanism by which HGF up-regulates its receptor, we found that c-Met is a direct transcriptional target of Mitf. This was confirmed with chromatin immunoprecipitation experiments of the human c-Met promoter, as well as by the ability of adenovirally expressed Mitf to modulate endogenous c-Met protein levels in melanocytes. Disruption of Mitf blocked HGF-dependent increases in endogenous c-Met message and protein levels, indicating that HGF regulates its own receptor levels via Mitf. Finally, dominant-negative inhibition of Mitf resulted in profound resistance of melanocytes and melanoma cells to HGF-dependent matrix invasion, suggesting a physiologic role for this pathway in melanocytic development and melanoma.
Cell Nucleus, Chromatin Immunoprecipitation, Microphthalmia-Associated Transcription Factor, Models, Genetic, Hepatocyte Growth Factor, MAP Kinase Signaling System, Blotting, Western, Immunoblotting, Adenoviridae, Kinetics, Gene Expression Regulation, Cell Line, Tumor, Humans, Melanocytes, Cell Lineage, Neoplasm Metastasis, Melanoma, Cells, Cultured, DNA Primers, Genes, Dominant
Cell Nucleus, Chromatin Immunoprecipitation, Microphthalmia-Associated Transcription Factor, Models, Genetic, Hepatocyte Growth Factor, MAP Kinase Signaling System, Blotting, Western, Immunoblotting, Adenoviridae, Kinetics, Gene Expression Regulation, Cell Line, Tumor, Humans, Melanocytes, Cell Lineage, Neoplasm Metastasis, Melanoma, Cells, Cultured, DNA Primers, Genes, Dominant
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