Corticotropin releasing hormone receptor 2 exacerbates chronic cardiac dysfunction.

Corticotropin releasing hormone receptor 2 exacerbates chronic cardiac dysfunction.
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DOI:
10.1084/jem.20161924
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发表时间:
2017-07-03
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Murohara T
Murohara T
中科院分区:
其他
文献类型:
--
作者:
Tsuda T;Takefuji M;Wettschureck N;Kotani K;Morimoto R;Okumura T;Kaur H;Eguchi S;Sakaguchi T;Ishihama S;Kikuchi R;Unno K;Matsushita K;Ishikawa S;Offermanns S;Murohara T

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慢性心力衰竭患者的预后仍然很差,强调需要确定其他病理生理因素。Tsuda等人表明,Crhr 2激活导致心功能障碍,并表明Crhr 2阻断是慢性心力衰竭的一种有前景的治疗策略。当心脏不能有效地泵送血液并维持组织灌注时发生心力衰竭。尽管在过去的几十年中取得了许多治疗进展,但慢性心力衰竭患者的预后仍然很差,强调需要确定其他病理生理因素。在这里,我们表明,促肾上腺皮质激素释放激素受体2(Crhr 2)是一种G蛋白偶联受体在心肌细胞中高度表达,连续输注Crhr 2激动剂,尿皮质素2(UCN 2),降低小鼠左心室射血分数。此外,心力衰竭患者的血浆Ucn 2水平是健康对照组的7.5倍。此外,心肌细胞特异性缺失Crhr 2保护小鼠免受压力超负荷诱导的心功能障碍。用Crhr 2拮抗剂处理的小鼠失去了适应不良的3′-5′-环磷酸腺苷(cAMP)依赖性信号传导,并且没有因超负荷而发生心力衰竭。总的来说,我们的研究结果表明,组成性Crhr 2激活导致心功能不全,并表明Crhr 2阻断是一种有前途的治疗策略,慢性心力衰竭患者。
Prognosis of patients with chronic heart failure remains poor, emphasizing the need to identify additional pathophysiological factors. Tsuda et al. show that Crhr2 activation causes cardiac dysfunction and suggest Crhr2 blockade is a promising therapeutic strategy for chronic heart failure. Heart failure occurs when the heart is unable to effectively pump blood and maintain tissue perfusion. Despite numerous therapeutic advancements over previous decades, the prognosis of patients with chronic heart failure remains poor, emphasizing the need to identify additional pathophysiological factors. Here, we show that corticotropin releasing hormone receptor 2 (Crhr2) is a G protein–coupled receptor highly expressed in cardiomyocytes and continuous infusion of the Crhr2 agonist, urocortin 2 (Ucn2), reduced left ventricular ejection fraction in mice. Moreover, plasma Ucn2 levels were 7.5-fold higher in patients with heart failure compared to those in healthy controls. Additionally, cardiomyocyte-specific deletion of Crhr2 protected mice from pressure overload-induced cardiac dysfunction. Mice treated with a Crhr2 antagonist lost maladaptive 3′-5′-cyclic adenosine monophosphate (cAMP)–dependent signaling and did not develop heart failure in response to overload. Collectively, our results indicate that constitutive Crhr2 activation causes cardiac dysfunction and suggests that Crhr2 blockade is a promising therapeutic strategy for patients with chronic heart failure.
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