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Journal of Cell Science, Vol 111, Issue 14 1993-2004, Copyright © 1998 by Company of Biologists

JOURNAL ARTICLES

Human colonic cancer cells synthesize and adhere to laminin-5. Their adhesion to laminin-5 involves multiple receptors among which is integrin alpha2beta1

V Orian-Rousseau, D Aberdam, P Rousselle, A Messent, J Gavrilovic, G Meneguzzi, M Kedinger and P Simon-Assmann
INSERM U.381, 67200 Strasbourg, France.

In the mature gut, laminin-5 is expressed at the basal aspect of the differentiating epithelial cells. In vitro, we show that three more or less differentiated human colonic cancer HT29 cell lines produce and deposit laminin-5; they predominantly synthesize and secrete the 440 kDa form of laminin-5 that comprises the unprocessed 155 kDa gamma2 chain, as determined by immunoprecipitation analysis. In contrast, the highly differentiated colon carcinoma Caco-2 cells produce almost no laminin-5. Using anti-integrin antibodies, we show that adhesion of the two colonic cancer cell lines to laminin-5 is mediated by multiple integrin receptors including those for alpha3beta1, alpha6beta1 and alpha6beta4 integrins like in other cell types. In addition, the implication of integrin alpha2beta1 in this adhesion process is demonstrated for the first time. This has been shown by cell adhesion inhibition experiments, solid phase assays and confocal analysis. Together with previous in situ observations, these data provide a baseline knowledge for the understanding of the regulation of laminin-5 in normal and pathological intestine.
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