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Distribution of the beta 1 subgroup of the integrins in human cells and tissues

B De Strooper, B Van der Schueren, M Jaspers, M Saison, M Spaepen, F Van Leuven, H Van den Berghe and JJ Cassiman

Center for Human Genetics, University of Leuven, Belgium.

We studied the distribution of the beta 1 integrin subfamily in human tissues and cells by light microscopy, electron microscopy, and immunoblotting, using monoclonal antibody DH12, previously shown to react with the beta 1 subunit of the human fibronectin receptor. Crossreaction with the other beta subunits of the integrin family, which have 45% and 47% primary amino acid sequence identity with the beta 1 subunit, was excluded, as MAb DH12 did not react with the beta 2 subunit in granulocytes and the beta 3 subunit in thrombocytes. Reactivity with the anti-beta 1 antibody was found in skin, lung, heart, striated and smooth muscle, blood cells, liver, kidney, intestine, spleen and placenta. Thus, cells of mesodermal, ectodermal, and entodermal origin express the beta 1 subunit. In skin fibroblasts cultured in vitro, beta 1 subunit was also detected intracellularly. The wide distribution of the beta 1 family, originally detected in activated T-lymphocytes after prolonged culture in vitro, contrast with the restricted distribution of the beta 2 integrins on leucocytes.

Volume 37, Issue 3, pp. 299-307, 03/01/1989
Copyright © 1989 by The Histochemical Society


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