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• W2146385190 abstract "High serum levels of aldosterone have been linked to the development of cardiac disease. In contrast, angiotensin (Ang)-(1-7) was extensively shown to possess cardioprotective effects, including the attenuation of cardiac dysfunction induced by excessive mineralocorticoid activation in vivo, suggesting possible interactions between these 2 molecules. Here, we investigated whether there is cross-talk between aldosterone and Ang-(1-7) and its functional consequences for calcium (Ca 2+ ) signaling in ventricular myocytes. Short-term effects of aldosterone on Ca 2+ transient were assessed in Fluo-4/AM-loaded myocytes. Confocal images showed that Ang-(1-7) had no effect on Ca 2+ transient parameters, whereas aldosterone increased the magnitude of the Ca 2+ transient. Quite unexpectedly, addition of Ang-(1-7) to aldosterone-treated myocytes further enhanced the amplitude of the Ca 2+ transient suggesting a synergistic effect of these molecules. Aldosterone action on Ca 2+ transient amplitude was mediated by protein kinase A, and was related to an increase in Ca 2+ current ( I Ca ) density. Both changes were not altered by Ang-(1-7). When cardiomyocytes were exposed to aldosterone, increased Ca 2+ spark rate was measured. Ang-(1-7) prevented this change. In addition, a NO synthase inhibitor restored the effect of aldosterone on Ca 2+ spark rate in Ang-(1-7)-treated myocytes and attenuated the synergistic effect of these 2 molecules on Ca 2+ transient. These results indicate that NO plays an important role in this cross-talk. Our results bring new perspectives in the understanding of how 2 prominent molecules with supposedly antagonist cardiac actions cross-talk to synergistically amplify Ca 2+ signals in cardiomyocytes." @default.
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• W2146385190 date "2013-02-01" @default.
• W2146385190 modified "2023-09-27" @default.
• W2146385190 title "Functional Cross-Talk Between Aldosterone and Angiotensin-(1-7) in Ventricular Myocytes" @default.
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• W2146385190 doi "https://doi.org/10.1161/hypertensionaha.111.199539" @default.
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