Abstract
It is generally believed that the vascular endothelium serves as an inflammatory barrier by providing a nonadherent surface to leukocytes. Here, we report that Fas ligand (FasL) is expressed on vascular endothelial cells (ECs) and that it may function to actively inhibit leukocyte extravasation. TNFα downregulates FasL expression with an accompanying decrease in EC cytotoxicity toward co-cultured Fas-bearing cells. Local administration of TNFα to arteries downregulates endothelial FasL expression and induces mononuclear cell infiltration. Constitutive FasL expression markedly attenuates TNFα-induced cell infiltration and adherent mononuclear cells undergo apoptosis under these conditions. These findings suggest that endothelial FasL expression can negatively regulate leukocyte extravasation.
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Sata, M., Walsh, K. TNFα regulation of Fas ligand expression on the vascular endothelium modulates leukocyte extravasation. Nat Med 4, 415–420 (1998). https://doi.org/10.1038/nm0498-415
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DOI: https://doi.org/10.1038/nm0498-415
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