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The reported increase in basal activity of hearts from transgenic mice (TG4) overexpressing the human beta 2-adrenoceptor (beta 2-AR) was explained by spontaneously active beta 2-ARs that stimulate the beta-adrenergic cascade in the absence of an agonist. In order to examine altered myocardial function on a cellular level, we have investigated L-type calcium current (ICa,L) and cell shortening in ventricular myocytes from TG4 hearts. Myocytes from littermates (LM) and wild type animals (WT) served as controls.

L-type calcium current and contractility in ventricular myocytes from mice overexpressing the cardiac β2-adrenoceptor