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Nakayama H , Chen X , Baines CP , Klevitsky R , Zhang X , Zhang H , Jaleel N , Chua BH , Hewett TE , Robbins J , Houser SR , Molkentin JD
Ca- and mitochondrial-dependent cardiomyocyte necrosis as a primary mediator of heart failure
J Clin Invest. 2007 Sep 4;117(9) :2431-2444
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Abstract
Loss of cardiac myocytes in heart failure is thought to occur largely through an apoptotic process. Here we show that heart failure can also be precipitated through myocyte necrosis associated with Ca(2+) overload. Inducible transgenic mice with enhanced sarcolemmal L-type Ca(2+) channel (LTCC) activity showed progressive myocyte necrosis that led to pump dysfunction and premature death, effects that were dramatically enhanced by acute stimulation of beta-adrenergic receptors. Enhanced Ca(2+) influx-induced cellular necrosis and cardiomyopathy was prevented with either LTCC blockers or beta-adrenergic receptor antagonists, demonstrating a proximal relationship among beta-adrenergic receptor function, Ca(2+) handling, and heart failure progression through necrotic cell loss. Mechanistically, loss of cyclophilin D, a regulator of the mitochondrial permeability transition pore that underpins necrosis, blocked Ca(2+) influx-induced necrosis of myocytes, heart failure, and isoproterenol-induced premature death. In contrast, overexpression of the antiapoptotic factor Bcl-2 was ineffective in mitigating heart failure and death associated with excess Ca(2+) influx and acute beta-adrenergic receptor stimulation. This paradigm of mitochondrial- and necrosis-dependent heart failure was also observed in other mouse models of disease, which supports the concept that heart failure is a pleiotropic disorder that involves not only apoptosis, but also necrotic loss of myocytes in association with dysregulated Ca(2+) handling and beta-adrenergic receptor signaling.
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Journal article