PAX3 and SOX10 Activate MET Receptor Expression in Melanoma

Overview

Journal Pigment Cell Melanoma Res

Date 2010 Jan 14

PMID 20067553

Citations 27

Authors

Joseph B Mascarenhas

Erica L Littlejohn

Rebecca J Wolsky

Kacey P Young

Maria Nelson

Ravi Salgia

Deborah Lang

Affiliations

Soon will be listed here.

Abstract

Melanoma is a cancer with a poorly understood molecular pathobiology. We find the transcription factors PAX3, SOX10, MITF, and the tyrosine kinase receptor MET expressed in melanoma cell lines and primary tumors. Analysis for MET expression in primary tumor specimens showed 27/40 (68%) of the samples displayed an increased expression of MET, and this expression was highly correlated with parallel expression of PAX3, SOX10, and MITF. PAX3 and MITF bind to elements in the MET promoter independently, without evidence of either synergistic activation or inhibition. SOX10 does not directly activate the MET gene alone, but can synergistically activate MET expression with either PAX3 or MITF. In melanoma cells, there was evidence of two pathways for PAX3 mediated MET induction: (i) direct activation of the gene, and (ii) indirect regulation through MITF. SK-MEL23 melanoma cells have both of these pathways intact, while SK-MEL28 melanoma cells only have the first pathway. In summary, we find that PAX3, SOX10 and MITF play an active role in melanoma cells by regulating the MET gene. In consequence, MET promotes the melanoma cancer phenotype by promoting migration, invasion, resistance to apoptosis, and tumor cell growth.

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