Cell Death Dis:HMGA1通过抑制自噬加重糖尿病心肌病患者的心功能不全

2020-03-17 MedSci原创 MedSci原创

流行病学研究表明,糖尿病(DM)与心力衰竭(HF)密切相关;在2型糖尿病的患者人群中,心力衰竭比心肌梗塞更为常见。结构转录因子HMGA1,对糖尿病心肌病的心脏重塑的影响尚不明确。

流行病学研究表明,糖尿病(DM)与心力衰竭(HF)密切相关;在2型糖尿病的患者人群中,心力衰竭比心肌梗塞更为常见。HMGA1作为一种结构转录因子,在分子及细胞水平上参与细胞周期进程、胚胎发育、肿瘤转化、分化、凋亡细胞代谢及DNA修复等一系列生物学过程。然而,其对于糖尿病心肌病中的心脏重塑(指心脏炎症、细胞凋亡及功能障碍)的影响目前尚不清楚。

在该研究中,研究人员发现HMGA1在糖尿病小鼠的心脏及高糖刺激处理的心肌细胞中高表达。过表达HMGA1能够加速高糖诱导的心肌细胞炎症及细胞凋亡反应,而敲低HMGA1可以缓解这些反应。在链霉素诱导的糖尿病小鼠模型中,通过AAV9病毒转运系统在小鼠心脏中过表达HMGA1则会恶化炎症反应、增加细胞凋亡反应,并加速心脏功能障碍。通过AAV9-shHMGA1敲低内源HMGA1可以改善糖尿病小鼠的心脏重塑。

机制研究发现,HMGA1可以通过调节P27/CDK2/mTOR信号转导通路来抑制自噬形成,而非降解。 敲低CDK2或过表达P27可缓解过表达HMGA1所诱导的体外恶化作用。在糖尿病小鼠心脏中,过表达P27能够抵消过表达HMGA1诱导的心脏重塑恶化。荧光素酶报告基因实验证实,HMGA1对于P27的调节作用主要是由miR-222所介导的。此外,miR-222拮抗剂可以抵消过表达HMGA1所诱导的恶化作用。

综上所述,HMGA1可以通过直接调节miR-222启动子活性,加强P27/mTOR诱导的自噬反应,进而提高糖尿病心肌病的发病风险。

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    2020-04-05 docwu2019
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    2020-03-19 cy0328
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    2020-03-17 misszhang

    谢谢MedSci提供最新的威廉亚洲官网

    0

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 糖尿病心肌病(DCM)是由糖尿病引起的、以左室舒张和(或)收缩功能障碍为表现的心肌病变,且与高血压性心脏病、冠状动脉粥样硬化性心脏病、心脏瓣膜病及其他心脏病变无关。该疾病在代谢紊乱及微血管病变的基础上引发心肌广泛灶性坏死,出现亚临床心功能异常,最终进展为心力衰竭、心律失常及心源性休克,重症患者甚至发生猝死。   潘静, 美国心脏学会(AHA)、美国糖尿病学会(ADA)会员,美国得克萨斯A&

Diabetes:MICU1通过线粒体Ca2+依赖的抗氧化反应缓解糖尿病心肌病!

总的来说,该研究结果首次提供了直接证据证实上调MICU1可以保护db/db小鼠的心脏功能,这表明增加MICU1的表达或活性可能是改善心肌病糖尿病的一种药物治疗方法。