Abstract
In rat portal vein myocytes, alpha 2A-adrenoceptors activate voltage-dependent Ca2+ channels via a transduction pathway requiring protein kinase C activation mediated by a pertussis-toxin-sensitive G-protein. As revealed by the use of antibodies directed against the different alpha-subunits expressed in portal vein myocytes, we show that the clonidine-induced stimulation of voltage-dependent Ca2+ channels is mainly mediated by a Gi1-2-protein.
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