PARP-2 regulates SIRT1 expression and whole-body energy expenditure.

PARP-2 regulates SIRT1 expression and whole-body energy expenditure.
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DOI:
10.1016/j.cmet.2011.03.013
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发表时间:
2011-04-06
期刊:
影响因子:
29
通讯作者:
Auwerx J
Auwerx J
中科院分区:
生物学1区
文献类型:
--
作者:
Bai P;Canto C;Brunyánszki A;Huber A;Szántó M;Cen Y;Yamamoto H;Houten SM;Kiss B;Oudart H;Gergely P;Menissier-de Murcia J;Schreiber V;Sauve AA;Auwerx J

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SIRT 1是一种NAD+依赖性酶,通过脱乙酰化能量消耗的关键转录调节因子来影响代谢。在这里,我们测试了PARP-2(一种替代NAD+消耗酶)的缺失是否会影响NAD+生物利用度和SIRT 1活性。我们的研究结果表明,PARP-2缺陷增加SIRT 1活性在培养的肌管。然而,这种增加不是由于NAD+水平的变化,而是由于SIRT 1表达的增加,因为PARP-2作为SIRT 1启动子的直接负调节剂。小鼠中PARP-2缺失增加SIRT 1水平,促进能量消耗,并增加线粒体含量。此外,PARP-2−/−小鼠可免受饮食诱导的肥胖。尽管对胰岛素敏感,但PARP-2−/−小鼠由于胰腺功能缺陷而葡萄糖不耐受。因此,虽然PARP活性的抑制通过SIRT 1活化促进氧化代谢,但将PARP抑制剂用于代谢目的将需要进一步了解不同PARP家族成员的特定功能。
SIRT1 is a NAD+-dependent enzyme that affects metabolism by deacetylating key transcriptional regulators of energy expenditure. Here we tested whether deletion of PARP-2, an alternative NAD+ consuming enzyme, impacts on NAD+ bioavailability and SIRT1 activity. Our results indicate that PARP-2 deficiency increases SIRT1 activity in cultured myotubes. However, this increase was not due to changes in NAD+ levels, but to an increase in SIRT1 expression, as PARP-2 acts as a direct negative regulator of the SIRT1 promoter. PARP-2 deletion in mice increases SIRT1 levels, promotes energy expenditure, and increases mitochondrial content. Furthermore, PARP-2−/− mice were protected against diet-induced obesity. Despite being insulin sensitized, PARP-2−/− mice were glucose intolerant due to a defective pancreatic function. Hence, while inhibition of PARP activity promotes oxidative metabolism through SIRT1 activation, the use of PARP inhibitors for metabolic purposes will require further understanding of the specific functions of different PARP family members.
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