Stretch-elicited Na+/H+ exchanger activation: The autocrine/paracrine loop and its mechanical counterpart

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Abstract

The stretch of the cardiac muscle is immediately followed by an increase in the contraction strength after which occurs a slow force increase (SFR) that takes several minutes to fully develop. The SFR was detected in a wide variety of experimental preparations including isolated myocytes, papillary muscles and/or trabeculae, left ventricle strips of failing human myocardium, in vitro isovolumic and in vivo volume-loaded hearts. It was established that the initial increase in force is due to an increase in myofilament Ca2+ responsiveness, whereas the SFR results from an increase in the Ca2+ transient. However, the mechanism(s) for this increase in the Ca2+ transient has remained undefined until the proposal of Na+/H+ exchanger (NHE) activation by stretch. Studies in multicellular cardiac muscle preparations from cat, rabbit, rat and failing human heart have shown evidence that the stretch induces a rise in intracellular Na+ ([Na+]i) through NHE activation, which subsequently leads to an increase in Ca2+ transient via reverse-mode Na+/Ca2+ (NCX) exchange. These experimental data agree with a theoretical ionic model of cardiomyocytes that predicted an increased Na+ influx and a concurrent increase in Ca2+ entry through NCX as the cause of the SFR to muscle stretch. However, there are aspects that await definitive demonstration, and perhaps subjected to species-related differences like the possibility of an autocrine/paracrine loop involving angiotensin II and endothelin as the underlying mechanism for stretch-induced NHE activation leading to the rise in [Na+]i and reverse-mode NCX. © 2003 European Society of Cardiology. Published by Elsevier Science B.V. All rights reserved.

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Cingolani, H. E., Pérez, N. G., Pieske, B., Von Lewinski, D., & Camilión De Hurtado, M. C. (2003, April 1). Stretch-elicited Na+/H+ exchanger activation: The autocrine/paracrine loop and its mechanical counterpart. Cardiovascular Research. https://doi.org/10.1016/S0008-6363(02)00768-X

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