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- W2020061024 abstract "We have investigated the mechanism of IL-7-mediated inhibition of dexamethasone-induced apoptosis in T cells. Broad-spectrum caspase inhibitors block dexamethasone-triggered nuclear fragmentation, but not the loss of mitochondrial transmembrane potential or membrane integrity in CD3(+) mature T cells isolated from adult mouse spleens. IL-7 blocked dexamethasone-induced apoptosis and the processing of caspase-3 and caspase-7. IL-7 also blocked dexamethasone-triggered dephosphorylation of the serine-threonine kinase Akt/PKB and its target, the Ser(136) residue in Bad. The loss of anti-apoptotic proteins Bcl-x(L) and inhibitor of apoptosis protein-2 (IAP-2) was also blocked by IL-7. The protective effect was attenuated by pharmacological inhibitors of phosphatidylinositol-3 kinase (PI3K) with one exception: inhibition of PI3K did not abrogate Bcl-x(L) expression in the presence of IL-7. The anti-apoptotic role of Akt suggested by these experiments was tested by overexpression of constitutively active Akt, which blocked dexamethasone-induced apoptosis and elevated IAP-2 but not Bcl-x(L) levels in a mature T cell line. Thus, IL-7 regulates IAP-2 expression and inhibits dexamethasone-induced apoptosis by activating Akt via PI3K-dependent signaling, but regulates Bcl-x(L)expression via a PI3K-independent pathway in mature T cells." @default.
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- W2020061024 date "2003-04-01" @default.
- W2020061024 modified "2023-09-26" @default.
- W2020061024 title "IL-7 inhibits dexamethasone-induced apoptosis via Akt/PKB in mature, peripheral T cells" @default.
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- W2020061024 doi "https://doi.org/10.1002/eji.200323782" @default.
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