Artículo de revista
L-type calcium channel β subunit modulates angiotensin II responses in cardiomyocytes
Fecha
2011Registro en:
Channels, Volumen 5, Issue 3, 2018,
19336969
19336950
10.4161/chan.5.3.15833
Autor
Hermosilla, Tamara
Moreno, Cristian
Itfinca, Mircea
Altier, Christophe
Armisen Yáñez, Ricardo
Stutzin Schottlander, Andrés
Zamponi, Gerald W.
Varela, Diego
Institución
Resumen
Angiotensin II regulation of L-type calcium currents in cardiac muscle is controversial and the underlying signaling events are not completely understood. Moreover, the possible role of auxiliary subunit composition of the channels in Angiotensin II modulation of L-type calcium channels has not yet been explored. In this work we study the role of CaVβ subunits and the intracellular signaling responsible for L-type calcium current modulation by Angiotensin II. In cardiomyocytes, Angiotensin II exposure induces rapid inhibition of L-type current with a magnitude that is correlated with the rate of current inactivation. Semi-quantitative PCR of cardiomyocytes at different days of culture reveals changes in the CaVβ subunits expression pattern that are correlated with the rate of current inactivation and with Angiotensin II effect. Overexpression of individual β subunits in heterologous systems reveals that the magnitude of Angiotensin II inhibition is dependent on the CaVβ subunit isoform