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• W2894490661 abstract "Rationale: Hypertrophic cardiomyopathy occurs with a frequency of about 1 in 500 people. Approximately 30% of those affected carry mutations within the gene encoding cMyBP-C (cardiac myosin binding protein C). Cardiac stress, as well as cMyBP-C mutations, can trigger production of a 40kDa truncated fragment derived from the amino terminus of cMyBP-C (Mybpc3 40kDa ). Expression of the 40kDa fragment in mouse cardiomyocytes leads to hypertrophy, fibrosis, and heart failure. Here we use genetic approaches to establish a causal role for excessive myofibroblast activation in a slow, progressive genetic cardiomyopathy—one that is driven by a cardiomyocyte-intrinsic genetic perturbation that models an important human disease. Objective: TGFβ (transforming growth factor-β) signaling is implicated in a variety of fibrotic processes, and the goal of this study was to define the role of myofibroblast TGFβ signaling during chronic Mybpc3 40kDa expression. Methods and Results: To specifically block TGFβ signaling only in the activated myofibroblasts in Mybpc3 40kDa transgenic mice and quadruple compound mutant mice were generated, in which the TGFβ receptor II (TβRII) alleles ( Tgfbr2 ) were ablated using the periostin ( Postn ) allele, myofibroblast-specific, tamoxifen-inducible Cre ( Postnmcm ) gene-targeted line. Tgfbr2 was ablated either early or late during pathological fibrosis. Early myofibroblast-specific Tgfbr2 ablation during the fibrotic response reduced cardiac fibrosis, alleviated cardiac hypertrophy, preserved cardiac function, and increased lifespan of the Mybpc3 40kDa transgenic mice. Tgfbr2 ablation late in the pathological process reduced cardiac fibrosis, preserved cardiac function, and prolonged Mybpc3 40kDa mouse survival but failed to reverse cardiac hypertrophy. Conclusions: Fibrosis and cardiac dysfunction induced by cardiomyocyte-specific expression of Mybpc3 40kDa were significantly decreased by Tgfbr2 ablation in the myofibroblast. Surprisingly, preexisting fibrosis was partially reversed if the gene was ablated subsequent to fibrotic deposition, suggesting that continued TGFβ signaling through the myofibroblasts was needed to maintain the heart fibrotic response to a chronic, disease-causing cardiomyocyte-only stimulus." @default.
• W2894490661 created "2018-10-05" @default.
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• W2894490661 date "2018-12-07" @default.
• W2894490661 modified "2023-10-14" @default.
• W2894490661 title "Myofibroblast-Specific TGFβ Receptor II Signaling in the Fibrotic Response to Cardiac Myosin Binding Protein C-Induced Cardiomyopathy" @default.
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• W2894490661 doi "https://doi.org/10.1161/circresaha.118.313089" @default.
• W2894490661 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6309316" @default.
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