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- W2169264762 abstract "Abstract: T cells expressing the appropriate T-cell receptor Vβ chain proliferate in response to Staphylococcus enterotoxin A (SEA) pulsed antigen-presenting cells (APQ, whereas other T cells do not (SEA “non-re-sponders”). Activated human T cells express MHC class II molecules that are high affinity receptors for SEA. Here we show that, in the absence of APC, SEA induces a profound inhibition of IL-15-driven proliferation in MHC class II+, human SEA-“responder” T-cell lines. In contrast, proliferation induced by phorbol esther (PMA) was enhanced by SEA. The inhibitory effect on cytokine-mediated mitogenesis correlates with an inhibition of EL-2Rβ expression and ligand-induced tyrosine phosphorylation of IL.-2R. Cyclo-sporin A (CyA), an inhibitor of the protein phosphatase (PP2B) calcineurin, strongly inhibits the SEA-induced modulations of cytokine receptor expression. Moreover, CyA inhibits both the anti-mitogenic effect of SEA on cyto-kine-induced proliferation and the pro-mitogenic effect of PMA. In contrast, inhibitors of PP1, PP2A, protein kinase C (PKC), phosphatidyl-inositol-3-kinase (PI-3K) and mammalian target of rapamycin (mTOR) are unable to inhibit the effects of SEA. In a SEA “non-responder” T-cell clone obtained from the affected skin of a patient with psoriasis vulgaris, SEA does not inhibit IL-2Rβ expression and IL-15-driven proliferation. On the contrary, SEA enhances IL-15- and IL-2-induced proliferation via a CyA-sensitive pathway in this T-cell clone. In conclusion, the present data show that (i) SEA selectively inhibits IL-15- (but not PMA-) mediated proliferation in SEA “re-sponder” T cells, (ii) SEA enhances cytokine-driven growth in psoriasis T cells with a “non-responder” phenotype, and (iii) crosstalk between SEA receptors and the LL-15R (and IL-2R) pathway is mediated via a PP2B-de-pendent and PP1/PP2A-, PKC-, PI-3 kinase- and mTOR-independent pathway in human T-cell lines." @default.
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- W2169264762 date "2008-09-30" @default.
- W2169264762 modified "2023-10-18" @default.
- W2169264762 title "Staphylococcus enterotoxin A modulates interleukin 15-induced signaling and mitogenesis in human T cells" @default.
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- W2169264762 doi "https://doi.org/10.1111/j.1399-0039.1998.tb02961.x" @default.
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