Mechanisms regulating c-met overexpression in liver-metastatic B16-LS9 melanoma cells.

Abstract:

:Liver selected B16-LS9 melanoma cells show a dramatic overexpression of the proto-oncogene c-met, the cellular receptor for hepatocyte growth factor/scatter factor. As a consequence, c-met becomes constitutively active, and the cells become more responsive to hepatocyte growth factor stimulation. We have investigated the molecular mechanisms regulating c-met expression in both the parental line B16-F1, which has low expression levels, and the liver-specific B16-LS9, overexpressing c-met. Overexpression is observed at the protein and mRNA levels, however without further evidence of gene amplification or rearrangement. c-met promoter activity was higher in B16-LS9 than B16-F1 cells, and also a nuclear run-off showed higher transcription levels in B16-LS9 cells. Moreover, we found that c-met mRNA had a longer half-life in B16-LS9 cells, thus indicating also the involvement of post-transcriptional regulation mechanisms. Finally, we found evidence that autonomous activation of the melanocortin receptor-1 (MCR-1) is at least partially responsible for c-met upregulation in B16-LS9 cells, since treatment of the cells with a potent MSH antagonist (the agouti peptide) has strong down-regulatory effects.

journal_name

J Cell Biochem

authors

Elia G,Ren Y,Lorenzoni P,Zarnegar R,Burger MM,Rusciano D

doi

10.1002/1097-4644(20010601)81:3<477::aid-jcb1061>3

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

477-87

issue

3

eissn

0730-2312

issn

1097-4644

pii

10.1002/1097-4644(20010601)81:3<477::AID-JCB1061>3

journal_volume

81

pub_type

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