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PARP-1 Inhibition Increases Mitochondrial Metabolism through SIRT1 Activation.

机译:PARP-1抑制通过SIRT1激活增加线粒体代谢。

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摘要

SIRT1 regulates energy homeostasis by controlling the acetylation status and activity of a number of enzymes and transcriptional regulators. The fact that NAD(+) levels control SIRT1 activity confers a hypothetical basis for the design of new strategies to activate SIRT1 by increasing NAD(+) availability. Here we show that the deletion of the poly(ADP-ribose) polymerase-1 (PARP-1) gene, encoding a major NAD(+)-consuming enzyme, increases NAD(+) content and SIRT1 activity in brown adipose tissue and muscle. PARP-1(-)(/-) mice phenocopied many aspects of SIRT1 activation, such as a higher mitochondrial content, increased energy expenditure, and protection against metabolic disease. Also, the pharmacologic inhibition of PARP in vitro and in vivo increased NAD(+) content and SIRT1 activity and enhanced oxidative metabolism. These data show how PARP-1 inhibition has strong metabolic implications through the modulation of SIRT1 activity, a property that could be useful in the management not only of metabolic diseases, but also of cancer.
机译:SIRT1通过控制乙酰化状态和许多酶和转录调节剂的活性来调节能量稳态。 NAD(+)水平控制SIRT1活性的事实为通过增加NAD(+)可用性激活SIRT1的新策略设计提供了假设基础。在这里我们显示,编码主要消耗NAD(+)的酶的poly(ADP-核糖)聚合酶-1(PARP-1)基因的删除,增加了棕色脂肪组织和肌肉中NAD(+)的含量和SIRT1的活性。 PARP-1(-)(/-)小鼠表现出SIRT1激活的许多方面,例如更高的线粒体含量,增加的能量消耗以及对代谢疾病的保护。此外,在体外和体内对PARP的药理抑制作用均会增加NAD(+)含量和SIRT1活性,并增强氧化代谢。这些数据表明,通过调节SIRT1活性,PARP-1抑制具有强烈的代谢影响,这一特性不仅可用于代谢疾病的治疗,而且还可用于癌症的治疗。

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