Myofilament Ca2+ sensitization causes susceptibility to cardiac arrhythmia in mice
نویسندگان
چکیده
منابع مشابه
Myofilament Ca2+ sensitization causes susceptibility to cardiac arrhythmia in mice.
In human cardiomyopathy, anatomical abnormalities such as hypertrophy and fibrosis contribute to the risk of ventricular arrhythmias and sudden death. Here we have shown that increased myofilament Ca2+ sensitivity, also a common feature in both inherited and acquired human cardiomyopathies, created arrhythmia susceptibility in mice, even in the absence of anatomical abnormalities. In mice expre...
متن کاملMyofilament Ca sensitization increases cytosolic Ca binding affinity, alters intracellular Ca homeostasis, and causes pause-dependent Ca-triggered arrhythmia.
RATIONALE Ca binding to the troponin complex represents a major portion of cytosolic Ca buffering. Troponin mutations that increase myofilament Ca sensitivity are associated with familial hypertrophic cardiomyopathy and confer a high risk for sudden death. In mice, Ca sensitization causes ventricular arrhythmias, but the underlying mechanisms remain unclear. OBJECTIVE To test the hypothesis t...
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Isoflurane (ISO) is known to depress cardiac contraction. Here, we hypothesized that decreasing myofilament Ca(2+) responsiveness is central to ISO-induced reduction in cardiac force development. Moreover, we also tested whether the nitroxyl (HNO) donor 1-nitrosocyclohexyl acetate (NCA), acting as a myofilament Ca(2+) sensitizer, restores force in the presence of ISO. Trabeculae from the right ...
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متن کامل8-bromo-cGMP reduces the myofilament response to Ca2+ in intact cardiac myocytes.
The role of cGMP in myocardial contraction is not established. Recent reports suggest that nitric oxide, released by endothelial cells or within myocytes, modifies myocardial contraction by raising cGMP. We studied the effects of 8-bromo-cGMP (8bcGMP, 50 mumol/L) on contraction (cell shortening) and simultaneous intracellular Ca2+ transients (indo 1 fluorescence ratio) in intact adult rat ventr...
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ژورنال
عنوان ژورنال: Journal of Clinical Investigation
سال: 2008
ISSN: 0021-9738
DOI: 10.1172/jci36642