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- W2087225689 abstract "Cultured human endothelial cells (EC) increase CD40 ligand expression on polyclonally activated human peripheral blood CD4+ helper T cells compared to T cells activated in the absence of accessory cells or in the presence of peripheral blood adherent cells or B cells. Induction of CD40 ligand expression appears to be biphasic with early induction observable at 6 h and later induction at 24 h. EC cause T cells to increase CD40 ligand expression during the early phase at 6 h after activation. CD40 ligand expression is restricted to the CD4+ helper T cell subset of the peripheral blood T cells, even when EC is present. Blocking monoclonal antibodies to co-stimulatory molecules on EC and T cells indicate that the CD2/LFA-3 pathway, which also contributes to induction of augmented interleukin-2 (IL-2) secretion is involved in EC-induced up-regulation of CD40 ligand. Exogenous IL-2 can also increase CD40 ligand expression. However, increased IL-2 secretion in the presence of EC can not fully account for endothelial-induced CD40 ligand up-regulation as (1) the effect of exogenous IL-2 is greater at 24 h than at 6 h, whereas the opposite is true for EC; (2) the effect of saturating levels of IL-2 is considerably smaller than that of EC; and (3) blocking of IL-2 receptors does not fully inhibit endothelial effects on CD40 ligand expression. We conclude that EC provide unique co-stimulatory signals that effect the phenotype of activated CD4+ T cells." @default.
- W2087225689 created "2016-06-24" @default.
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- W2087225689 date "1996-04-01" @default.
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- W2087225689 title "Endothelial cells augment the expression of CD40 ligand on newly activated human CD4+ T cells through a CD2/LFA-3 signaling pathway" @default.
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- W2087225689 doi "https://doi.org/10.1002/eji.1830260316" @default.
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