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Journal of Experimental Medicine, Vol 181, 1179-1186, Copyright © 1995 by Rockefeller University Press
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FW Luscinskas, H Ding and AH Lichtman
Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts 02115.
This report examines the adhesive interactions of human CD4+ T lymphocytes with tumor necrosis factor alpha-activated human endothelial cell monolayers in an in vitro model that mimics microcirculatory flow conditions. Resting CD4+ T cell interactions with activated endothelium consisted of initial attachment followed by rolling, stable arrest, and then spreading and transendothelial migration. P-selectin, but not E-, or L-selectin, mediated most of this initial contact and rolling, whereas beta 1-integrins (alpha 4 beta 1), interacting with endothelial-expressed vascular cell adhesion molecule 1, participated in rolling and mediated stable arrest. In contrast, beta 2-integrins were primarily involved in spreading and transmigration. These findings highlight an important role for P- selectin and suggest discrete functions for beta 1- and beta 2- integrins during lymphocyte recruitment to sites of immune-mediated inflammation.
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