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首页> 外文期刊>Journal of receptor and signal transduction research >Age-related up-regulation of β3-adrenergic receptor in heart-failure rats
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Age-related up-regulation of β3-adrenergic receptor in heart-failure rats

机译:心衰大鼠β3-肾上腺素能受体的年龄相关上调

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Stimulation of β1- and β2-adrenergic receptors (ARs) in the heart results in positive inotropy. In contrast, it has been reported that the β3-AR is also expressed in the heart and that its stimulation leads to negative inotropic effects. The aim of this study was to investigate the expression of β3-AR in age-related heart-failure rats and its relevance to left ventricular dysfunction. Aging male Wistar rats were divided into young and aging groups according to age, and each group included sham-operation and heart-failure subgroups. Left ventricular end-diastolic pressure (LVEDP) and the ratio of left ventricular weight to body weight (LV/BW) were significantly higher for the aging heart-failure versus young heart-failure and the heart-failure versus sham-operation groups (P<0.01, respectively). However, the left ventricular end-systolic pressure (LVESP) and the maximal rate of rise or fall of left ventricular pressure were all significantly lower for the aging heart-failure versus young heart-failure and the heart-failure versus sham-operation groups (P<0.01, respectively). β3-AR protein levels increased significantly when heart failure worsened in aging rats. These results suggest that β3-AR expression in age-related heart-failure rats and left ventricular function were highly correlated.
机译:心脏中β1和β2肾上腺素能受体(ARs)的刺激会导致正性肌力。相反,已经报道β3-AR也在心脏中表达,并且其刺激导致负性肌力作用。这项研究的目的是研究β3-AR在年龄相关性心力衰竭大鼠中的表达及其与左心功能不全的关系。将雄性Wistar大鼠按年龄分为年轻组和衰老组,每组包括假手术和心力衰竭亚组。老年心衰组与年轻心衰组以及心衰组与假手术组相比,左心室舒张末压(LVEDP)和左心室重量与体重之比(LV / BW)显着更高(P分别<0.01)。但是,对于较年轻的心衰患者和较假手术的心衰患者,左心室收缩末压(LVESP)和左心室压力的最大上升或下降幅度均显着降低( P <0.01)。当衰老大鼠的心力衰竭恶化时,β3-AR蛋白水平显着增加。这些结果表明,与年龄相关的心衰大鼠中的β3-AR表达与左心室功能高度相关。

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