褪黑素新作用,可激活Mst1-Nrf2信号缓解肺动脉高压心肌肥厚

2022-09-16 刘少飞 MedSci原创

本研究旨在通过研究抗氧化剂褪黑激素 (Mel) 的心脏保护能力来治疗 PAH 中的不良 RV 重塑及其潜在机制,从而提出一种可能的治疗方法。

在肺动脉高压 (PAH) 患者中,右心室 (RV) 功能被认为是心容量和存活率的主要决定因素。然而,尽管认识到保持 RV 功能的临床重要性,但目前还没有有效的治疗方法可用于 RV 衰竭。本研究旨在通过研究抗氧化剂褪黑激素 (Mel) 的心脏保护能力来治疗 PAH 中的不良 RV 重塑及其潜在机制,从而提出一种可能的治疗方法。

精氨酸加压素体外诱导新生大鼠心肌细胞肥大;体内,通过腹膜内注射野百合碱 (MCT) 在大鼠中诱导 PAH,并在 MCT 前 24 小时腹膜内给予 Mel。Mel 通过激活 Mst1-Nrf2 通路在体外减少大鼠心肌细胞肥大和线粒体氧化应激,这些都在 Mst1 的 siRNA 敲低后被逆转。

同样,在体内, Mel 预处理显着改善了 MCT 引起的心脏功能恶化、RV 肥大、纤维化和扩张。这些有益作用还与 Mst1-Nrf2 通路上调及其相关的氧化应激减少有关,RV 丙二醛含量的降低就是证明。

值得注意的是,Mel 处理的结果与 N-乙酰半胱氨酸 (NAC) 获得的结果相似甚至更好,后者已被证实是 PAH 的抗氧化处理。相比之下,与 Mst1 抑制剂 XMU-MP-1 共同治疗逆转了所有这些与 Mel 相关的有益作用。因此,我们的研究结果确定 Mel 是一种有效的心脏保护剂,可通过 Mst1-Nrf2 通路激活增强抗氧化反应,从而对抗适应不良的 RV 重塑。

研究启示:

第一,Mel 的抗氧化活性可缓解 AVP 诱导的心肌细胞肥大和线粒体氧化应激。第二,Mel通过Mst1-Nrf2通路激活发挥其抗肥大作用。第三,Mel 治疗减少了 MCT 诱导的 RV 重塑和功能障碍。第四,Mel 通过重新激活 Mst1-Nrf2 信号通路缓解 MCT 诱导的 RV 重塑。

 

参考文献:

Chen S, Sun P, Li Y, Shen W, Wang C, Zhao P, Cui H, Xue JY, Du GQ. Melatonin activates the Mst1-Nrf2 signaling to alleviate cardiac hypertrophy in pulmonary arterial hypertension. Eur J Pharmacol. 2022 Sep 10:175262. doi: 10.1016/j.ejphar.2022.175262. Epub ahead of print. PMID: 36100129.

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    2022-10-11 循证小兵

    #褪黑素#新作用,可激活Mst1-#Nrf2#信号缓解#肺动脉高压##心肌肥厚#

    0

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    2022-09-26 ms9000000242407236

    褪黑素的新作用

    0

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    2022-09-16 minzju5053

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Nat Commun:平滑肌中 AMPK 缺乏导致新生儿持续性肺动脉高压及过早死亡

越来越多的证据表明 AMPK 缺乏可能促进缺氧性和特发性肺动脉高压,其机制在很大程度上未知且治疗效果不佳。因此,重要的是要确定这个悖论的性质。

2022年ESC/ERS肺动脉高压指南-引言及新内容概况

关于管理与左心病相关的PH值的建议 (PH-LHD)和肺部疾病的建议已经更新,包括一个新的患有肺部疾病的患者的严重PH值的血流动力学定义。