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• W2013271791 abstract "Glucocorticoids increase pyruvate dehydrogenase kinase-4 (PDK4) mRNA and protein expression, which phosphorylates pyruvate dehydrogenase, thereby preventing the formed pyruvate from undergoing mitochondrial oxidation. This increase in PDK4 expression is mediated by the mandatory presence of Forkhead box other factors (FoxOs) in the nucleus. In the current study, we examined the importance of the nongenomic effects of dexamethasone (Dx) in determining the compartmentalization of FoxO and hence its transcriptional activity. Rat cardiomyocytes exposed to Dx produced a robust decrease in glucose oxidation. Measurement of FoxO compartmentalization demonstrated increase in nuclear but resultant decrease in cytosolic content of FoxO1 with no change in the total content. The increase in nuclear content of FoxO1 correlated to an increase in nuclear phospho-p38 MAPK together with a robust association between this transcription factor and kinase. Dx also promoted nuclear retention of FoxO1 through a decrease in phosphorylation of Akt, an effect mediated by heat shock proteins binding to Akt. Measurement of the nuclear and total expression of sirtuin-1 protein showed no change after Dx. Instead, Dx increased the association of sirtuin-1 with FoxO1, thereby causing a decrease in FoxO acetylation. Manipulation of FoxO1 through agents that interfere with its nuclear shuttling or acetylation were effective in reducing Dx-induced increase in PDK4 protein expression. Our data suggest that FoxO1 has a major PDK4-regulating function. In addition, given the recent suggestions that altering glucose use can set the stage for heart failure, manipulating FoxO could assist in devising new therapeutic strategies to optimize cardiac metabolism and prevent PDK4 induced cardiac complications." @default.
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• W2013271791 date "2010-02-24" @default.
• W2013271791 modified "2023-10-14" @default.
• W2013271791 title "The Increase in Cardiac Pyruvate Dehydrogenase Kinase-4 after Short-Term Dexamethasone Is Controlled by an Akt-p38-Forkhead Box Other Factor-1 Signaling Axis" @default.
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• W2013271791 doi "https://doi.org/10.1210/en.2009-1072" @default.
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