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Regulation of Ca2+ influx in myocardial cells by beta adrenergic receptors, cyclic nucleotides, and phosphorylation

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Abstract

Calcium channels in the heart play a major role in cardiac function. These channels are modulated in a variety of ways, including protein phosphorylation. Cyclic AMP-mediated phosphorylation is the best understood phosphorylation mechanism which regulates calcium influx into cardiac cells. Binding of an agonist (e.g., a catecholamine) to the appropriate receptor stimulates production of cyclic AMP by adenylate cyclase. The cyclic AMP may subsequently bind to and activate a cyclic AMP-dependent protein kinase, which then can phosphorylate a number of substrates, including the calcium channel (or a closely-associated regulatory protein). This results in stimulation of the calcium channels, greater calcium influx, and increased contractility. The cyclic AMP system is not the only protein kinase system in the heart. Thus, the possibility exists that other protein kinases may also regulate the calcium channels and, hence, cardiac function. Recent evidence suggests that cyclic GMP-mediated phosphorylation may play a role opposite to cyclic AMP-mediated phosphorylation, i.e., inhibition of the calcium current rather than stimulation. Other recent evidence also suggests that a calcium/calmodulin-dependent protein kinase and calcium/phospholipid-dependent protein kinase (protein kinase C) may also regulate the myocardial calcium channels. Thus, protein phosphorylation may be a general mechanism whereby calcium channels and cardiac function are modulated under a variety of conditions.

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  1. Department of Physiology and Biophysics, University of Cincinnati College of Medicine, 45267, Cincinnati, OH, USA

    Nicholas Sperelakis & Gordon M. Wahler

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  1. Nicholas Sperelakis
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  2. Gordon M. Wahler
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Sperelakis, N., Wahler, G.M. Regulation of Ca2+ influx in myocardial cells by beta adrenergic receptors, cyclic nucleotides, and phosphorylation. Mol Cell Biochem 82, 19–28 (1988). https://doi.org/10.1007/BF00242511

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