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American Journal of Pathology, Vol 145, 1070-1081, Copyright © 1994 by American Society for Investigative Pathology
REGULAR ARTICLES |
MP Skinner, EW Raines and R Ross
Department of Pathology, University of Washington School of Medicine, Seattle 98195.
Vascular smooth muscle cells (SMCs) in the media of normal arteries express alpha 1 beta 1 integrin with no detectable alpha 2 beta 1 as determined by immunocytochemistry. In contrast, immunoprecipitation of integrins expressed by human SMCs cultured from medial explants shows strong expression of alpha 2 beta 1 and no expression of alpha 1 beta 1. The apparent reciprocal expression of these two collagen and laminin receptors was confirmed by flow cytometric analysis of fluorescent labeled cells. Freshly isolated SMCs had detectable alpha 1, alpha 3, alpha 5, and alpha v subunits with low levels of detectable beta 3 and no detectable alpha 2. Cultured SMCs expressed alpha 2, alpha 3, alpha 5 and alpha v subunits with little or no alpha 1 or beta 3. Neither alpha 4 nor alpha 6 were detectable in freshly isolated or cultured cells. Expression of alpha 2 beta 1 receptors by cultured SMCs appears to be required for the migration of these cells on type I collagen. Migration of cultured SMCs across a type I collagen-coated membrane toward two different chemotactic stimuli, platelet-derived growth factor-BB (1 nmol/L) and insulin-like growth factor-(1 nmol/L), was Mg2+ dependent and inhibited by preincubation of cells with an affinity- purified polyclonal anti-alpha 2 beta 1 antibody or by monoclonal antibodies directed against the individual alpha 2 or beta 1 subunits. Attachment to type 1 collagen membranes was not affected by antibodies under conditions where migration was significantly impeded. The combined data show that SMC expression of alpha 1 beta 1 and alpha 2 beta 1 integrin receptors for collagen and laminin is dynamic and reciprocal and may be important with respect to SMC migration on type I collagen. These findings are potentially important in understanding the pathophysiology of vascular diseases, for example, atherosclerosis and restenosis following balloon angioplasty, where SMC migration is a contributing factor.
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