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Localization of a novel integrin of the beta 1 subfamily in human tissues

A Favre, M Giunta, Y Gu, G Corte and CE Grossi

Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy.

We have previously described a novel integrin composed of a beta 1- chain non-covalently linked to an alpha-chain which is biochemically different from those known so far (i.e., alpha 1-alpha 7 and alpha v). This molecule has been identified with a monoclonal antibody (MAb) termed 10.1.2 raised against long-term cultured human thymic epithelial cells (TEC). In this study we analyzed the immunohistochemical distribution of this new integrin in a variety of human tissues. MAb 10.1.2 stains several types of endothelial and epithelial cells. Among the endothelia, a strong reaction was detected in the HEV of lymphoid organs including thymus, lymph node, tonsil, and mucosa-associated lymphoid tissue. Epithelial localizations of note were those in the basal layer of the epidermis and of other stratified squamous epithelia, where the lateral and apical but not the deep surfaces of most cells were stained. A variety of water-electrolyte transporting cells in sweat glands, salivary glands, and kidney were also stained at their deep surface. The latter findings suggest that this molecule may subserve other functions in addition to those related to cell adhesion.

Volume 40, Issue 9, pp. 1291-1298, 09/01/1992
Copyright © 1992 by The Histochemical Society


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