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- W2006418305 abstract "We have demonstrated that T3 increases the expression of ZAKI-4alpha, an endogenous calcineurin inhibitor. In this study we characterized a T3-dependent signaling cascade leading to ZAKI-4alpha expression in human skin fibroblasts. We found that T3-dependent increase in ZAKI-4alpha was greatly attenuated by rapamycin, a specific inhibitor of a protein kinase, mammalian target of rapamycin (mTOR), suggesting the requirement of mTOR activation by T3. Indeed, T3 activated mTOR rapidly through S2448 phosphorylation, leading to the phosphorylation of p70(S6K), a substrate of mTOR. This mTOR activation is mediated through phosphatidylinositol 3-kinase (PI3K)-Akt/protein kinase B (PKB) signaling cascade because T3 induced Akt/PKB phosphorylation more rapidly than that of mTOR, and these T3-dependent phosphorylations were blocked by both PI3K inhibitors and by expression of a dominant negative PI3K (Deltap85alpha). Furthermore, the association between thyroid hormone receptor beta1 (TRbeta1) and PI3K-regulatory subunit p85alpha, and the inhibition of T3-induced PI3K activation and mTOR phosphorylation by a dominant negative TR (G345R) demonstrated the involvement of TR in this T3 action. The liganded TR induces the activation of PI3K and Akt/PKB, leading to the nuclear translocation of the latter, which subsequently phosphorylates nuclear mTOR. The rapid activation of PI3K-Akt/PKB-mTOR-p70(S6K) cascade by T3 provides a new molecular mechanism for thyroid hormone action." @default.
- W2006418305 created "2016-06-24" @default.
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- W2006418305 date "2005-01-01" @default.
- W2006418305 modified "2023-10-15" @default.
- W2006418305 title "Thyroid Hormone Induces Rapid Activation of Akt/Protein Kinase B-Mammalian Target of Rapamycin-p70<sup>S6K</sup>Cascade through Phosphatidylinositol 3-Kinase in Human Fibroblasts" @default.
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- W2006418305 doi "https://doi.org/10.1210/me.2004-0093" @default.
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