APJ acts as a dual receptor in cardiac hypertrophy.

APJ acts as a dual receptor in cardiac hypertrophy.
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APJ充当心脏肥大中的双重受体。

DOI:
10.1038/nature11263
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发表时间:
2012-08-16
期刊:
影响因子:
64.8
通讯作者:
Ruiz-Lozano, Pilar
Ruiz-Lozano, Pilar
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Scimia, Maria Cecilia;Hurtado, Cecilia;Ray, Saugata;Metzler, Scott;Wei, Ke;Wang, Jianming;Woods, Chris E.;Purcell, Nicole H.;Catalucci, Daniele;Akasaka, Takeshi;Bueno, Orlando F.;Vlasuk, George P.;Kaliman, Perla;Bodmer, Rolf;Smith, Layton H.;Ashley, Euan;Mercola, Mark;Brown, Joan Heller;Ruiz-Lozano, Pilar

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心脏肥大是作为对持续超负荷的适应性反应而开始的,但随着心力衰竭的发生而病理性进展。在这里,我们报告说,APJ 的遗传缺失可以通过显着减少心肌肥厚和心力衰竭来抵抗慢性压力超负荷。相反,缺乏apelin(内源性APJ配体)的小鼠仍然敏感,这表明APJ具有独立于apelin的功能。新鲜分离的无 APJ 的心肌细胞表现出对拉伸的减弱反应,表明 APJ 是一种机械传感器。拉伸激活 APJ 会增加心肌细胞的大小并诱导肥大的分子标记。 apelin 刺激 APJ 激活 Gαi 并引发保护性反应,而以 APJ 依赖性、不依赖 G 蛋白的方式发出拉伸信号以诱导肥大。通过抑制 β-arrestins 或通过 Gαi 作用的药理学剂量的 apelin 可以预防拉伸介导的肥大。综上所述,我们的数据表明 APJ 是机械拉伸和内源性肽 apelin 的双功能受体。通过感知这些刺激之间的平衡,APJ 占据了将持续超负荷与心肌细胞肥大联系起来的关键点。
Cardiac hypertrophy is initiated as an adaptive response to sustained overload but progresses pathologically as heart failure ensues. Here we report that genetic loss of APJ confers resistance to chronic pressure overload by dramatically reducing myocardial hypertrophy and heart failure. In contrast, mice lacking apelin (the endogenous APJ ligand) remain sensitive, suggesting an apelin independent function of APJ. Freshly isolated APJ-null cardiomyocytes exhibit an attenuated response to stretch, indicating that APJ is a mechano-sensor. Activation of APJ by stretch increases cardiomyocyte cell size and induces molecular markers of hypertrophy. Whereas apelin stimulates APJ to activate Gαi and elicits a protective response, stretch signals in an APJ-dependent G-protein-independent fashion to induce hypertrophy. Stretch-mediated hypertrophy is prevented by knockdown of β-arrestins or by pharmacological doses of apelin acting through Gαi. Taken together, our data indicate that APJ is a bifunctional receptor for both mechanical stretch and for the endogenous peptide apelin. By sensing the balance between these stimuli, APJ occupies a pivotal point linking sustained overload to cardiomyocyte hypertrophy.
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