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- W1520738008 abstract "Abstract In this report we describe a novel pathway of human T cell activation and proliferation involving the CD5 surface Ag. The CD5-specific Cris1 mAb induces by itself monocyte-dependent proliferation of PBMC. Among a panel of CD5-specific mAb (Leu1, OKT1, LO-CD5a, F101-1C5, and F145GF3), only the F145GF3 mAb shared this property with Cris1. The analysis of the biochemical pathway involved in this activation showed the lack of detectable hydrolysis of inositol phosphates or early increments in the intracellular cytosolic calcium concentration, after triggering cells with the mitogenic CD5 mAb. However, stimulation with CD5 induces activation of protein kinase C, as measured by phosphorylation of a specific peptide substrate (peptide GS), which can be inhibited by a pseudosubstrate peptide inhibitor. Stimulation with CD5 mAb induces also tyrosine kinase activity, with a substrate pattern that differs from that induced after triggering lymphocytes through the TCR-CD3 complex. On the other hand the IL-2/IL-2R pathway seems involved in the CD5-mediated proliferation of PBMC because anti-IL-2R-specific mAb inhibits CD5-induced proliferation, and stimulation with mitogenic CD5 mAb induces production of IL-2 and expression of IL-2R alpha and beta chains. Therefore, the triggering of the CD5 Ag can induce IL-2- and monocyte-dependent human T cell proliferation by a biochemical pathway that differs, at least in the first stages, from the one that mediates TCR-CD3 complex-induced T cell activation." @default.
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- W1520738008 date "1992-03-01" @default.
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- W1520738008 title "Intracellular events involved in CD5-induced human T cell activation and proliferation." @default.
- W1520738008 doi "https://doi.org/10.4049/jimmunol.148.5.1287" @default.
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