L-type calcium channel β subunit modulates angiotensin II responses in cardiomyocytes
Author
dc.contributor.author
Hermosilla, Tamara
Author
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Moreno, Cristian
Author
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Itfinca, Mircea
Author
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Altier, Christophe
Author
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Armisen Yáñez, Ricardo
Author
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Stutzin Schottlander, Andrés
Author
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Zamponi, Gerald W.
Author
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Varela, Diego
Admission date
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2019-03-11T13:01:38Z
Available date
dc.date.available
2019-03-11T13:01:38Z
Publication date
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2011
Cita de ítem
dc.identifier.citation
Channels, Volumen 5, Issue 3, 2018,
Identifier
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19336969
Identifier
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19336950
Identifier
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10.4161/chan.5.3.15833
Identifier
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https://repositorio.uchile.cl/handle/2250/165225
Abstract
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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