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dc.contributor.authorTamayo, María
dc.contributor.authorMartín Nunes, Laura
dc.contributor.authorVal Blasco, Almudena
dc.contributor.authorGarcia Miguel Piedras, María José 
dc.contributor.authorLarriba, María J.
dc.contributor.authorGómez Hurtado, Nieves
dc.contributor.authorFernández Velasco, María
dc.contributor.authorDelgado, Carmen
dc.description.abstractCalcitriol, the bioactive metabolite of vitamin D, interacts with the ubiquitously expressed nuclear vitamin D receptor (VDR) to induce genomic effects, but it can also elicit rapid responses via membrane-associated VDR through mechanisms that are poorly understood. The down-regulation of K+ currents is the main origin of electrophysiological remodeling in pathological hypertrophy and heart failure (HF), which can contribute to action potential prolongation and subsequently increase the risk of triggered arrhythmias. Adult mouse ventricular myocytes were isolated and treated with 10 nM calcitriol or vehicle for 15–30 min. In some experiments, cardiomyocytes were pretreated with the Akt inhibitor triciribine. In the adult mouse ventricle, outward K+ currents involved in cardiac repolarization are comprised of three components: the fast transient outward current (Itof), the ultrarapid delayed rectifier K+ current (Ikur), and the non-inactivating steady-state outward current (Iss). K+ currents were investigated using the whole-cell or the perforated patch-clamp technique and normalized to cell capacitance to obtain current densities. Calcitriol treatment of cardiomyocytes induced an increase in the density of Itof and Ikur, which was lost in myocytes isolated from VDRknockout mice. In addition, calcitriol activated Akt in cardiomyocytes and pretreatment with triciribine prevented the calcitriol-induced increase of outward K+ currents. In conclusion, we demonstrate that calcitriol via VDR and Akt increases both Itof and Ikur densities in mouse ventricular cardiomyocytes. Our findings may provide new mechanistics clues for the cardioprotective role of this hormone in the
dc.publisherFrontiers in Physiologyspa
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subjectPotassium currentsspa
dc.subjectCellular electrophysiologyspa
dc.subjectIonic channel remodelingspa
dc.titleCalcitriol, the Bioactive Metabolite of Vitamin D, Increases Ventricular K+ Currents in Isolated Mouse
dc.description.extent612 KBspa

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