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Journal of Cell Science, Vol 112, Issue 5 623-630, Copyright © 1999 by Company of Biologists

JOURNAL ARTICLES

Regulation of c-met expression in B16 murine melanoma cells by melanocyte stimulating hormone

D Rusciano, P Lorenzoni and MM Burger
Friedrich Miescher Institute, PO Box 2543, CH-4002 Basel, Switzerland. rusciano@fmi.ch.

B16 murine melanoma cells selected in vivo for enhanced liver metastatic ability (B16-LS9) show on the one hand an increased expression and constitutive activation of the proto-oncogene c-met (the receptor for hepatocyte growth factor/scatter factor), and on the other hand a more differentiated phenotype, when compared to the parental cell line, B16-F1. Following this observation, we have tried to establish whether there is a direct relationship between differentiation and c-met expression in B16 melanoma cells. Treatment of these cells with differentiating agents indicated that c-met expression was strongly induced by melanocyte stimulating hormone, while retinoic acid had almost no influence. c-met induction was triggered by engagement of the melanocortin receptor, cAMP elevation and PKA/PKC(&agr;) activation, as respectively shown by the effects of ACTH, cAMP elevating agents and specific PK inhibitors. Regulation of c-met expression via the melanocortin receptor and cAMP raises the intriguing possibility that autocrine and/or paracrine mechanisms acting in vivo on this circuit might influence (through c-met expression and activation) the metastatic behavior of these tumor cells, which we have shown to be dependent on their c-met expression.
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© The Company of Biologists Ltd 1999