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• W3104848430 abstract "Background The mutated α‐B‐Crystallin (CryAB R120G ) mouse model of desmin‐related myopathy (DRM) shows an age‐dependent onset of pathologic cardiac remodeling and progression of heart failure. CryAB R120G expression in cardiomyocytes affects the mitochondrial spatial organization within the myofibrils, but the molecular perturbation within the mitochondria in the relation of the overall course of the proteotoxic disease remains unclear. Methods and Results CryAB R120G mice show an accumulation of electron‐dense aggregates and myofibrillar degeneration associated with the development of cardiac dysfunction. Though extensive studies demonstrated that these altered ultrastructural changes cause cardiac contractility impairment, the molecular mechanism of cardiomyocyte death remains elusive. Here, we explore early pathological processes within the mitochondria contributing to the contractile dysfunction and determine the pathogenic basis for the heart failure observed in the CryAB R120G mice. In the present study, we report that the CryAB R120G mice transgenic hearts undergo altered mitochondrial dynamics associated with increased level of dynamin‐related protein 1 and decreased level of optic atrophy type 1 as well as mitofusin 1 over the disease process. In association with these changes, an altered level of the components of mitochondrial oxidative phosphorylation and pyruvate dehydrogenase complex regulatory proteins occurs before the manifestation of pathologic adverse remodeling in the CryAB R120G hearts. Mitochondria isolated from CryAB R120G transgenic hearts without visible pathology show decreased electron transport chain complex activities and mitochondrial respiration. Taken together, we demonstrated the involvement of mitochondria in the pathologic remodeling and progression of DRM‐associated cellular dysfunction. Conclusions Mitochondrial dysfunction in the form of altered mitochondrial dynamics, oxidative phosphorylation and pyruvate dehydrogenase complex proteins level, abnormal electron transport chain complex activities, and mitochondrial respiration are evident on the CryAB R120G hearts before the onset of detectable pathologies and development of cardiac contractile dysfunction." @default.
• W3104848430 created "2020-11-23" @default.
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• W3104848430 date "2020-12-01" @default.
• W3104848430 modified "2023-10-12" @default.
• W3104848430 title "Dysfunctional Mitochondrial Dynamic and Oxidative Phosphorylation Precedes Cardiac Dysfunction in R120G‐αB‐Crystallin‐Induced Desmin‐Related Cardiomyopathy" @default.
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• W3104848430 doi "https://doi.org/10.1161/jaha.120.017195" @default.
• W3104848430 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7763772" @default.
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