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Sci Rep:Cu(II)ATSM的心肌保护作用

2017-04-29 MedSci MedSci原创

Cu(II)ATSM是一种对缺氧敏感的正电子发射断层显像剂。近期的研究报告都强调了Cu(II)ATSM的神经保护性能,但至今仍没有报道提及其心肌保护作用。该研究证明了Cu(II)ATSM在人冠状动脉平滑肌细胞(HCASMC)和心肌细胞(HCM),能激活氧化还原敏感的转录因子Nrf2,导致抗氧化防御酶的上调。在小鼠模型试验中,Cu(II)ATSM的口服给药可诱导其在心脏和主动脉上表达Nrf2相关的酶

Cu(II)ATSM是一种对缺氧敏感的正电子发射断层显像剂。近期的研究报告都强调了Cu(II)ATSM的神经保护性能,但至今仍没有报道提及其心肌保护作用。

该研究证明了Cu(II)ATSM在人冠状动脉平滑肌细胞(HCASMC)和心肌细胞(HCM),能激活氧化还原敏感的转录因子Nrf2,导致抗氧化防御酶的上调。在小鼠模型试验中,Cu(II)ATSM的口服给药可诱导其在心脏和主动脉上表达Nrf2相关的酶。在人冠状动脉平滑肌细胞,Cu(II)ATSM可增加Nrf2稳定剂的DJ-1的表达,下调Nrf2或DJ-1,减弱Cu(II)介导的血红素氧化酶-1和 NADPH醌氧化还原酶1感应。用Cu(II)预处理的人冠状动脉平滑肌细胞,抑制超氧阴离子的产生、细胞凋亡、增殖和细胞内钙的增加,来防止血管紧张素II(Ang II)的氧化作用。

值得注意的是,经由Cu(II)介导的Nrf2的下调,防止血管紧张素-Ⅱ诱导人冠状动脉平滑肌细胞的凋亡作用已经减少。Cu(II)ATSM可增强DJ-1蛋白与超氧化物歧化酶-1(SOD-1)的联系,显着提升细胞内的Cu(II)水平和超氧化物歧化酶活性。

总的来说,该研究描述了一种新的机制,Cu(II)ATSM介导的诱导Nrf2相关的抗氧化酶和抗血管紧张素Ⅱ介导的通过Nrf2 / DJ-1轴激活导致的人冠状动脉平滑肌细胞功能紊乱。Cu(II)ATSM提供了一种通过上调抗氧化防御起到心脏保护作用的治疗策略。

原始出处:

Srivastava S, Blower PJ, Aubdool AA,et al.Cardioprotective effects of Cu(II)ATSM in human vascular smooth muscle cells and cardiomyocytes mediated by Nrf2 and DJ-1.Sci Rep. 2016 Dec 21;6(1):7. doi: 10.1038/s41598-016-0012-5.

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