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Autophagic predisposition in the insulin resistant diabetic heart

机译:胰岛素抵抗性糖尿病心脏的自噬倾向

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Existence of a diabetic cardiopathology, independent of vascular abnormalities, has been well reported. Diffuse interstitial fibrosis throughout the diabetic myocardium (even in the absence of an acute coronary event) suggests widespread cardiomyocyte attrition and cytokine activity. In addition to apoptotic and necrotic events, there is now good evidence that significant cardiomyocyte loss in the diabetic heart is driven by a different, non-apoptotic type of programmed cell death: autophagy. Although considered to be beneficial and pro-survival as a short term strategy to deal with acute stress, when chronically elevated or constitutive, excess autophagic activity has potential to be lethal. The insulin resistant myocardium exhibits various pro-autophagic characteristics: suppression of the PI3K(I)-Akt signaling pathway, oxidative stress and metabolic dysregulation, rendering the diabetic heart vulnerable to autophagic demise. There is compelling new evidence that in the diabetic myocardium cardiomyocyte attrition can be linked to autophagic upregulation. ? 2012 Elsevier Inc.
机译:糖尿病性心脏病的存在与血管异常无关,已被充分报道。整个糖尿病心肌弥漫性间质纤维化(即使没有急性冠脉事件)提示广泛的心肌耗损和细胞因子活性。除了凋亡和坏死事件外,现在有充分的证据表明,糖尿病性心脏中心肌细胞的大量丢失是由程序性细胞死亡的另一种非凋亡类型引起的:自噬。尽管作为应对急性应激的短期策略,它被认为是有益和有利于生存的,但当其长期升高或构成时,过量的自噬活性可能具有致命性。胰岛素抗性心肌表现出各种自噬特性:PI3K(I)-Akt信号通路的抑制,氧化应激和代谢异常,使糖尿病性心脏病易患自噬。有令人信服的新证据表明,在糖尿病心肌中,心肌细胞的损耗可能与自噬上调有关。 ? 2012爱思唯尔公司

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