Abstract
Stretching of cardiac muscle modulates contraction through the enhancement of the Ca2+ transient, but how this occurs is still not known. We found that stretching of myocytes modulates the elementary Ca2+ release process from ryanodine-receptor Ca2+-release channels (RyRCs), Ca2+ sparks and the electrically stimulated Ca2+ transient. Stretching induces PtdIns-3-OH kinase (PI(3)K)-dependent phosphorylation of both Akt and the endothelial isoform of nitric oxide synthase (NOS), nitric oxide (NO) production, and a proportionate increase in Ca2+-spark frequency that is abolished by inhibiting NOS and PI(3)K. Exogenously generated NO reversibly increases Ca2+-spark frequency without cell stretching. We propose that myocyte NO produced by activation of the PI(3)K–Akt–endothelial NOS axis acts as a second messenger of stretch by enhancing RyRC activity, contributing to myocardial contractile activation.
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Acknowledgements
We thank E.G. Lakatta and H. Cheng for useful discussions, M.D. Stern for critical comments on the manuscript, and M. Juhaszova, H.A. Spurgeon, K. Tarasov and B.D. Ziman for technical support. This work was supported by the Intramural Research Program, National Institute on Aging (S.J.S.), and an Action de Recherche Concertée (French Community of Belgium) and the National Fund for Scientific Research (J.L.B.).
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Analysis of membrane distribution of caveolae and estimation of the spatial range of NO action (PDF 125 kb)
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Petroff, M., Kim, S., Pepe, S. et al. Endogenous nitric oxide mechanisms mediate the stretch dependence of Ca2+ release in cardiomyocytes. Nat Cell Biol 3, 867–873 (2001). https://doi.org/10.1038/ncb1001-867
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DOI: https://doi.org/10.1038/ncb1001-867
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