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Cell Growth & Differentiation, Vol 8, Issue 1 83-90, Copyright © 1997 by American Association of Cancer Research


ARTICLES

Role of alpha 5 beta 1 integrin in determining malignant properties of colon carcinoma cells

J Gong, D Wang, L Sun, E Zborowska, JK Willson and MG Brattain
Department of Biochemistry and Molecular Biology, Medical College of Ohio, Toledo 43699-0008, USA.

We characterized the expression of alpha 5 beta 1 integrin in two distinct phenotypes of colon carcinoma cell lines. Highly invasive colon cell lines (designated Group I cell lines) expressed higher levels of integrin alpha 5 beta 1 mRNA and protein than did poorly invasive colon cell lines (designated Group III cell lines). The relatively high expression of integrin alpha 5 beta 1 in Group I cell lines resulted in strong enhancement of cell adhesion to fibronectin (FN) tissue culture plates, whereas Group III cell lines showed little or no enhancement of cell adhesion by coating. There was no significant difference between Group I and Group III cell lines with respect to cell adhesion to laminin and collagen IV. Cell adhesion to FN in Group I cells was mainly mediated by integrin alpha 5 beta 1 because a monoclonal anti-alpha 5 subunit antibody could block cell adhesion to FN, whereas anti-alpha 2 and anti-alpha 3 antibodies had no effect on cell adhesion to FN. The divergence of alpha 5 beta 1 expression in these two distinct colon carcinoma phenotypes suggested that high expression of alpha 5 beta 1 might contribute to malignant progression in this model system. To test this hypothesis, GEO cells, a Group III cell line that did not express alpha 5 integrin, were transfected with the alpha 5 subunit. Stable transfection of alpha 5 sense cDNA into a typical GEO-limiting dilution clone led to the expression of alpha 5 subunit mRNA and cell surface alpha 5 beta 1 protein. The alpha 5 sense transfectants showed enhanced attachment to FN-coated plates and were more tumorigenic when the cells were injected into athymic nude mice. These results indicate that inappropriately high alpha 5 beta 1 integrin expression contributes to malignant progression in colon carcinoma.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1997 by the American Association of Cancer Research.