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- W1978734646 abstract "Abstract Prostaglandins have been shown to be involved in the suppression of contact hypersensitivity (CHS) by so-far ill understood mechanisms. T-cell migration across the lining of cytokine-activated endo-thelial cells (EC) is thought to be a central step in the initiation of CHS. The aim of our investigation was therefore to examine whether prosta-glandin E1 (PGE1) influences cytokine-induced TK-1 mouse T-cell lymphoma adhesion to eEnd.2 mouse endothelioma cells. Here, we report that PGE1 (10−12− 10−8 M) dose-dependently reduced TNFα-induccd T-cell binding, while TNFα-unstimulated adhesion was not affected. To test whether PGE, acted primarily on T-cells or on EC, they were separately pretreated with PGE, prior to the adhesion assay. Selective PGE1 pretreatment of eEnd.2, but not of TK-1 dose-dependenlly inhibited TNFα, stimulated T-cell adhesion. Since binding of TK-1 to TNFα-treated eEnd.2 is mediated by the interaction of ICAM-1 and VCAM-1 (on EC) with their receptors LFA-1 and VLA-4 (on T-cells), we further investigated whether PGE1 would modulate the expression of these molecules. FACS-analysis revealed PGE1 to inhibit TNFα-induced upregulation of ICAM-1, but not of VCAM-I on EC. Furthermore, constitutive LFA-1 and VLA-4 expression on T-cells was not affected by PGE1. We conclude that PGE1 supresses T-cell adhesion to EC by selectively inhibiting TNFα-induced upregulation of ICAM-1 on EC. This may be one mechanism by which prostaglandins suppress immune responses requiring T-cell EC interactions such as contact hypersensitivity in skin." @default.
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- W1978734646 date "1995-10-01" @default.
- W1978734646 modified "2023-09-26" @default.
- W1978734646 title "Prostaglandin E1 inhibits TNFalpha-induced T-cell adhesion to endothelial cells by selective down-modulation of ICAM-1 expression on endothelial cells*" @default.
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- W1978734646 doi "https://doi.org/10.1111/j.1600-0625.1995.tb00209.x" @default.
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