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• W2335425653 abstract "We previously reported a point mutation substituting Cys for Arg 111 in the highly conserved troponin T (TnT)-contacting helix of cardiac troponin I (cTnI) in wild turkey hearts (Biesiadecki et al. J Biol Chem 279: 13825–13832, 2004). This dominantly negative TnI-TnT interface mutation decreases the binding affinity of cTnI for TnT, impairs diastolic function, and blunts the β-adrenergic response of cardiac muscle (Wei et al. J Biol Chem 285: 27806–27816, 2010). Here we further investigate cellular phenotypes of transgenic mouse cardiomyocytes expressing the equivalent mutation cTnI-K118C. Functional studies were performed on single adult cardiomyocytes after recovery in short-term culture from isolation stress. The amplitude of contraction and the velocities of shortening and relengthening were lower in cTnI-K118C cardiomyocytes than wild-type controls. The intracellular Ca 2+ transient was slower in cTnI-K118C cardiomyocytes than wild-type cells. cTnI-K118C cardiomyocytes also showed a weaker β-adrenergic response. The resting length of cTnI-K118C cardiomyocytes was significantly greater than that of age-matched wild-type cells, with no difference in cell width. The resting sarcomere was not longer, but slightly shorter, in cTnI-K118C cardiomyocytes than wild-type cells, indicating longitudinal addition of sarcomeres. More tri- and quadrinuclei cardiomyocytes were found in TnI-K118C than wild-type hearts, suggesting increased nuclear divisions. Whole-genome mRNA array and Western blots detected an increased expression of leukemia inhibitory factor receptor-β in the hearts of 2-mo-old cTnI-K118C mice, suggesting a signaling pathway responsible for the potent effect of cTnI-K118C mutation on early remodeling in cardiomyocytes." @default.
• W2335425653 created "2016-06-24" @default.
• W2335425653 creator A5056934744 @default.
• W2335425653 creator A5091500513 @default.
• W2335425653 date "2014-08-15" @default.
• W2335425653 modified "2023-10-14" @default.
• W2335425653 title "A dominantly negative mutation in cardiac troponin I at the interface with troponin T causes early remodeling in ventricular cardiomyocytes" @default.
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• W2335425653 doi "https://doi.org/10.1152/ajpcell.00053.2014" @default.
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