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- W4313005149 abstract "G protein-coupled receptors (GPCRs) are important regulators of cellular functions where agonist binding leads to receptor conformational changes and downstream activation of g-protein-mediated signaling cascades. Signal transduction is terminated by receptor phosphorylation mediated by G-protein coupled receptor kinases (GRKs). GPCR kinase 2 (GRK2) is a main GRK in the heart and is upregulated in heart failure (HF) patients. Recently, we and others have shown that GRK2 can translocate to cardiac mitochondria where it regulates metabolism. Notably, we found that phosphorylated GRK2 at S670 post- ischemia/reperfusion (IR) decreases glucose mitochondrial utilization and pyruvate dehydrogenase (PDH) activity. Furthermore, 2D-SDS PAGE followed by LC/MS/MS revealed a potential link between mitochondrial GRK2 and PDH phosphorylation. Using a novel PDHα KI CRISPR Cas HEK cell line, we tested the hypothesize that PDH phosphorylation of this novel site was important for PDH activity. Utilizing cytosolic and mitochondrially-targeted pyruvate indicators we measured pyruvate levels in WT and KI HEK cells. In parallel, using a novel mouse model GRK2-S670A, we investigated the role of ERK in mediating GRK2 mitochondrial translocation and pyroptotic signaling. Further experiments will determine long-term impact of mitochondrial GRK2 in cell survival in cardiac pathological conditions." @default.
- W4313005149 created "2023-01-05" @default.
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- W4313005149 date "2022-08-05" @default.
- W4313005149 modified "2023-09-24" @default.
- W4313005149 title "Abstract P2083: Erk-mediated Phosphorylation Of Grk2 Leads To Reduced Pyruvate Dehydrogenase Activity And Alters Pyroptotic Signaling" @default.
- W4313005149 doi "https://doi.org/10.1161/res.131.suppl_1.p2083" @default.
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