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• W4313335086 endingPage "4563" @default.
• W4313335086 startingPage "4557" @default.
• W4313335086 abstract "Abstract In vivo, MHC class I-restricted injury of allogeneic tissue or cells infected by intracellular pathogens occurs in the absence of classical cytolytic effector mechanisms and Ab. Modulation of the target cell adhesion to matrix may be an additional mechanism used to injure vascular or epithelial cells in inflammation. We studied the mechanisms of human umbilical vein endothelial cell (EC) detachment from matrix-coated plastic following contact by concanamycin A-treated lymphocytes as an in vitro model of perforin-independent modulation of EC basement membrane adhesion. Human PBL were depleted of monocytes, stimulated, then added to an EC monolayer plated on either fibronectin or type I collagen matrices. Activated, but not resting, PBL induced progressive EC detachment from the underlying matrix. Injury of the EC monolayer required direct cell contact with the activated lymphocytes because no detachment was seen when the PBL were placed above a Transwell membrane. Moreover plasma membranes prepared from activated but not resting PBL induced EC detachment. Adherent EC stimulated with activated PBL did not show evidence of apoptosis using TUNEL and annexin V staining at time points before EC detachment was observed. Finally, neither the matrix metalloproteinase inhibitors o-phenanthroline and BB-94 nor aprotinin blocked EC detachment. However, activation of EC β1 integrin using mAb TS2/16 or Mg2+ decreased EC detachment. These data indicate that cell-cell contact between activated PBL and EC reduces adhesion of EC to the underlying matrix, at least in part by inducing changes in the affinity of the endothelial β1 integrin." @default.
• W4313335086 created "2023-01-06" @default.
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• W4313335086 date "1999-10-15" @default.
• W4313335086 modified "2023-10-16" @default.
• W4313335086 title "Activated Lymphocytes Promote Endothelial Cell Detachment from Matrix: A Role for Modulation of Endothelial Cell β1 Integrin Affinity" @default.
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• W4313335086 doi "https://doi.org/10.4049/jimmunol.163.8.4557" @default.
• W4313335086 hasPublicationYear "1999" @default.
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