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- W2333048607 abstract "Expression of constitutively active Akt3 was found to increase the size of MCF-7 cells approximately twofold both in vitro and in vivo. A regulatable version of Akt1 (MER-Akt) was also found capable of inducing a twofold increase in the size of H4IIE rat hepatoma cells. Rapamycin, a specific inhibitor of mTOR function, was found to inhibit the Akt-induced increase in cell size by 70%, presumably via inhibition of the Akt-induced increase in protein synthesis. To determine whether Akt could be inhibiting protein degradation, thereby contributing to its ability to induce an increase in cell size, we conducted protein degradation experiments in the H4IIE cell line. Activation of MER-Akt was found to inhibit protein degradation to a degree comparable to insulin treatment. The effects of these two agents on protein degradation were not additive, thereby suggesting that they were acting on a similar pathway. An inhibitor of the phosphatidylinositol 3-kinase pathway, LY-294002, blocked both insulin- and Akt-induced inhibition of protein degradation, again consistent with the hypothesis that both agents were acting on the same pathway. In contrast, rapamycin did not block the ability of either agent to inhibit protein degradation. These results indicate that Akt increases cell size through both mTOR-dependent and -independent pathways and that the latter involves inhibition of protein degradation. These studies are also consistent with the hypothesis that insulin's ability to regulate protein degradation is to a large extent mediated via Akt." @default.
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- W2333048607 date "2003-11-01" @default.
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- W2333048607 title "Akt promotes increased mammalian cell size by stimulating protein synthesis and inhibiting protein degradation" @default.
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- W2333048607 doi "https://doi.org/10.1152/ajpendo.00239.2003" @default.
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