Format

Send to

Choose Destination
See comment in PubMed Commons below
Biol Chem. 2005 Sep;386(9):845-55.

GPCR-induced migration of breast carcinoma cells depends on both EGFR signal transactivation and EGFR-independent pathways.

Author information

1
Department of Molecular Biology, Max-Planck-Institute of Biochemistry, Am Klopferspitz 18A, D-82152 Martinsried, Germany.

Abstract

The epidermal growth factor receptor (EGFR) plays a key role in the regulation of important cellular processes under normal and pathophysiological conditions such as cancer. In human mammary carcinomas the EGFR is involved in regulating cell growth, survival, migration and metastasis and its activation correlates with the lack of response in hormone therapy. Here, we demonstrate in oestrogen receptor-positive and -negative human breast cancer cells and primary mammary epithelial cells a cross-communication between G protein-coupled receptors (GPCRs) and the EGFR. We present evidence that specific inhibition of ADAM15 or TACE blocks GPCR-induced and proHB-EGF-mediated EGFR tyrosine phosphorylation, downstream mitogenic signalling and cell migration. Notably, activation of the PI3K downstream mediator PKB/Akt by GPCR ligands involves the activity of sphingosine kinase (SPHK) and is independent of EGFR signal transactivation. We conclude that GPCR-induced chemotaxis of breast cancer cells is mediated by EGFR-dependent and -independent signalling pathways, with both parallel pathways having to act in concert to achieve a complete migratory response.

PMID:
16164409
DOI:
10.1515/BC.2005.099
[Indexed for MEDLINE]

MeSH terms, Substances

MeSH terms

Substances

PubMed Commons home

PubMed Commons

0 comments

    Supplemental Content

    Full text links

    Icon for iFactory
    Loading ...
    Support Center