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The calcium (Ca) pump of cardiac sarcoplasmic reticulum (SR) membranes is vulnerable to oxidation and hence likely to be damaged by chlorinated compounds, specifically hypochlorite (NaOCl) and monochloramine (NH2Cl), the most potent oxidants produced upon neutrophil activation. This could occur during prolonged ischemia or myocardial infarction when tissue levels of catecholamines are high. Phospholamban (PLN), the phosphorylatable regulator of the Ca pump, plays a central role in the effects of beta-adrenergic agonists on the heart. The purpose of this study was to investigate a possible role of PLN in determining the pump's sensitivity to NaOCl and NH2Cl.

Membrane phosphorylation protects the cardiac sarcoplasmic reticulum Ca2+-ATPase against chlorinated oxidants in vitro