Wnt‐5a and G‐protein signaling are required for collagen‐induced DDR1 receptor activation and normal mammary cell adhesion

• Published in: International journal of cancer Vol. 103; no. 3; pp. 344 - 351
• Main Authors: Dejmek, Janna, Dib, Karim, Jönsson, Marzieh, Andersson, Tommy
• Format: Journal Article
• Language: English
• Published: New York Wiley Subscription Services, Inc., A Wiley Company 20-01-2003; Wiley-Liss
• Subjects: adhesion; Adjuvants, Immunologic - pharmacology; Androstadienes - pharmacology; Biological and medical sciences; Breast - cytology; Breast Neoplasms - metabolism; Cancer and Oncology; Cancer och onkologi; Cell Adhesion - physiology; Cell Movement; Cholera Toxin - pharmacology; Clinical Medicine; Collagen - metabolism; DDR1; Discoidin Domain Receptor 1; Epithelial Cells - metabolism; GTP-Binding Proteins - physiology; Gynecology. Andrology. Obstetrics; Humans; Klinisk medicin; mammary epithelial cell; Mammary gland diseases; Medical and Health Sciences; Medical sciences; Medicin och hälsovetenskap; Peptides; Pertussis Toxin - pharmacology; Phosphatidylinositol 3-Kinases - antagonists & inhibitors; Phosphorylation - drug effects; Proto-Oncogene Proteins - physiology; Receptor Protein-Tyrosine Kinases - metabolism; Signal Transduction; src-Family Kinases - antagonists & inhibitors; Tumor Cells, Cultured; Tumors; Wasp Venoms - pharmacology; Wnt Proteins; Wnt-5a Protein; Wnt‐5a; Human; Cell culture; Biochemical analysis; Carcinoma; Malignant tumor; Adhesion; Carcinogenesis; In vitro; Mammary gland diseases; Collagen; Established cell line; Mammary gland; Molecular biology; G protein; Biological receptor
• ISSN: 0020-7136; 1097-0215
• DOI: 10.1002/ijc.10752

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 β1 integrins. Moreover, pertussis toxin reduced adhesion of the cells to collagen by approximately 50%, and antibodies against β1 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 Gi/o‐protein signaling pathway mediates the effect of Wnt‐5a expression by enabling collagen‐induced activation of DDR1, which, in parallel with β1 integrins, regulates adhesion of mammary cells. © 2002 Wiley‐Liss, Inc.