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• W1985744088 abstract "Protein kinase C-δ (PKCδ) exerts important cardiac actions as a lipid-regulated kinase. There is limited evidence that PKCδ also might exert an additional kinase-independent action as a regulator of the subcellular compartmentalization of binding partners such as Shc (Src homologous and collagen), a family of adapter proteins that play key roles in growth regulation and oxidative stress responses. This study shows that native PKCδ forms complexes with endogenous Shc proteins in H(2)O(2)-treated cardiomyocytes; H(2)O(2) treatment also leads to the accumulation of PKCδ and Shc in a detergent-insoluble cytoskeletal fraction and in mitochondria. H(2)O(2)-dependent recruitment of Shc isoforms to cytoskeletal and mitochondrial fractions is amplified by wild-type-PKCδ overexpression, consistent with the notion that PKCδ acts as a signal-regulated scaffold to anchor Shc in specific subcellular compartments. However, overexpression studies with kinase-dead (KD)-PKCδ-K376R (an ATP-binding mutant of PKCδ that lacks catalytic activity) are less informative, since KD-PKCδ-K376R aberrantly localizes as a constitutively tyrosine-phosphorylated enzyme to detergent-insoluble and mitochondrial fractions of resting cardiomyocytes; relatively little KD-PKCδ-K376R remains in the cytosolic fraction. The aberrant localization and tyrosine phosphorylation patterns for KD-PKCδ-K376R do not phenocopy the properties of native PKCδ, even in cells chronically treated with GF109203X to inhibit PKCδ activity. Hence, while KD-PKCδ-K376R overexpression increases Shc localization to the detergent-insoluble and mitochondrial fractions, the significance of these results is uncertain. Our studies suggest that experiments using KD-PKCδ-K376R overexpression as a strategy to competitively inhibit the kinase-dependent actions of native PKCδ or to expose the kinase-independent scaffolding functions of PKCδ should be interpreted with caution." @default.
• W1985744088 created "2016-06-24" @default.
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• W1985744088 date "2010-10-01" @default.
• W1985744088 modified "2023-09-26" @default.
• W1985744088 title "Protein kinase C-δ regulates the subcellular localization of Shc in H₂O₂-treated cardiomyocytes" @default.
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• W1985744088 doi "https://doi.org/10.1152/ajpcell.00170.2010" @default.
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