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Role of alpha1-adrenoceptor subtypes in production of the positive inotropic effects in mammalian myocardium: implications for the alpha1-adrenoceptor subtype distribution.

机译:α1肾上腺素受体亚型在哺乳动物心肌中产生正性变力作用中的作用:对α1肾上腺素受体亚型分布的影响。

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摘要

Both alpha1A- and alpha1B-adrenoceptor subtypes are present in mammalian myocardium. Alpha1-adrenoceptor activation can enhance myocardial contractility, and two possible inotropic mechanisms are proposed: an increase in myofilament Ca2+ sensitivity and an increase in transsarcolemmal Ca2+ influx during action potential prolongation that accompanies the transient outward current inhibition. We suggest that the former is mediated by the alpha1B-adrenoceptor subtype and the latter is by the alpha1A-adrenoceptor subtype. The alpha1B-adrenoceptor subtype may be located on a space more proximal to the sympathetic nerve endings than the alpha1A-adrenoceptor subtype, because the positive inotropic effect of endogenous norepinephrine was mediated entirely by the alpha1B-adrenoceptor subtype. In some species, the sustained positive inotropic effect develops following the transient negative inotropic effect, which is mediated by the alpha1A-adrenoceptor subtype.
机译:哺乳动物心肌中同时存在α1A和α1B肾上腺素受体亚型。 Alpha1-肾上腺素能受体的激活可以增强心肌的收缩能力,并提出了两种可能的正性肌力机制:在伴随瞬时向外电流抑制的动作电位延长过程中,肌丝Ca2 +敏感性增加和跨膜膜Ca2 +内流增多。我们建议前者是由alpha1B-肾上腺素受体亚型介导的,后者是由alpha1A-肾上腺素受体亚型介导的。由于内源性去甲肾上腺素的正性肌力作用完全由alpha1B-肾上腺素能受体介导,因此与Alpha1A-肾上腺素能受体亚型相比,α1B-肾上腺素能受体亚型可能位于比交感神经末梢更近的空间。在某些物种中,持续的正性正性肌力作用是在短暂的负性性正性肌力作用之后发展的,后者由alpha1A-肾上腺素受体亚型介导。

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