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Wnt‐5a and G‐protein signaling are required for collagen‐induced DDR1 receptor activation and normal mammary cell adhesion
Author(s) -
Dejmek Janna,
Dib Karim,
Jönsson Marzieh,
Andersson Tommy
Publication year - 2002
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.10752
Subject(s) - pertussis toxin , microbiology and biotechnology , biology , tyrosine phosphorylation , cholera toxin , wnt signaling pathway , cell adhesion , integrin , wortmannin , cancer research , phosphorylation , signal transduction , receptor , pi3k/akt/mtor pathway , g protein , biochemistry , endocrinology , cell
Abstract The collagen‐induced phosphorylation of discoidin domain receptor 1 (DDR1) in Wnt‐5a‐expressing HB2 mammary cells was effectively inhibited by pertussis toxin, but not by cholera toxin or antibodies blocking β 1 integrins. Moreover, pertussis toxin reduced adhesion of the cells to collagen by approximately 50%, and antibodies against β 1 integrins had a similar effect that was in fact additive to that of pertussis toxin. Cholera toxin had accordingly no such effect on adhesion. By comparison, pertussis toxin did not influence adhesion of Wnt‐5a‐antisense HB2 cells or MCF‐7 mammary tumor cells, neither of which express Wnt‐5a or exhibit activation of DDR1. In accordance with these results, direct mastoparan‐induced activation of G‐proteins in Wnt‐5a‐deficient MCF‐7 cells enabled collagen‐induced phosphorylation of DDR1 and enhanced their adhesion. The inactive analogue mastoparan‐17 had no such effects on MCF‐7 cells nor did active mastoparan affect adhesion of Wnt‐5a‐expressing HB2 cells. A possible explanation for how DDR1, a receptor tyrosine kinase (RTK), potentiates mammary cell adhesion comes from our observations that pertussis toxin also inhibited the recruitment of the cytoskeletal regulator phosphatidylinositol 3‐kinase (PI3K) to DDR1 as well as its phosphorylation/activation. In accordance with that, the PI3K inhibitor wortmannin significantly impaired adhesion of normal Wnt‐5a‐expressing HB2 cells but had little effect on adhesion of Wnt‐5a‐antisense HB2 cells. Thus, a G i/o ‐protein signaling pathway mediates the effect of Wnt‐5a expression by enabling collagen‐induced activation of DDR1, which, in parallel with β 1 integrins, regulates adhesion of mammary cells. © 2002 Wiley‐Liss, Inc.