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• W2945993165 abstract "Background Protein posttranslational modifications by O ‐linked β‐N‐acetylglucosamine (O‐GlcNAc) increase with cardiac hypertrophy, yet the functional effects of these changes are incompletely understood. In other organs, O‐GlcNAc promotes adaptation to acute physiological stressors; however, prolonged O‐GlcNAc elevations are believed to be detrimental. We hypothesize that early O‐GlcNAcylation improves cardiac function during initial response to pressure overload hypertrophy, but that sustained elevations during established pathological hypertrophy negatively impact cardiac function by adversely affecting calcium handling proteins. Methods and Results Transverse aortic constriction or sham surgeries were performed on littermate controls or cardiac‐specific, inducible O‐GlcNAc transferase knockout (OGTKO) mice to reduce O‐GlcNAc levels. O‐GlcNAc transferase deficiency was induced at different times. To evaluate the initial response to pressure overload, OGTKO was completed preoperatively and mice were followed for 2 weeks post‐surgery. To assess prolonged O‐GlcNAcylation during established hypertrophy, OGTKO was performed starting 18 days after surgery and mice were followed until 6 weeks post‐surgery. In both groups, OGTKO with transverse aortic constriction caused significant left ventricular dysfunction. OGTKO did not affect levels of the calcium handling protein SERCA2a. OGTKO reduced phosphorylation of phospholamban and cardiac troponin I, which would negatively impact cardiac function. O‐GlcNAcylation of protein kinase A catalytic subunit, a kinase for phospholamban, decreased with OGTKO. Conclusions O‐GlcNAcylation promotes compensated cardiac function in both early and established pathological hypertrophy. We identified a novel O‐GlcNAcylation of protein kinase A catalytic subunit, which may regulate calcium handling and cardiac function." @default.
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• W2945993165 date "2019-06-04" @default.
• W2945993165 modified "2023-10-03" @default.
• W2945993165 title "O‐GlcNAc Transferase Promotes Compensated Cardiac Function and Protein Kinase A O‐GlcNAcylation During Early and Established Pathological Hypertrophy From Pressure Overload" @default.
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• W2945993165 doi "https://doi.org/10.1161/jaha.118.011260" @default.
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