NAD(+) Replenishment Improves Lifespan and Healthspan in Ataxia Telangiectasia Models via Mitophagy and DNA Repair.

NAD(+) Replenishment Improves Lifespan and Healthspan in Ataxia Telangiectasia Models via Mitophagy and DNA Repair.
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NAD(+)补给可以通过线粒体和DNA修复来改善telangiectasia模型中的寿命和健康状态。

DOI:
10.1016/j.cmet.2016.09.004
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发表时间:
2016-10-11
期刊:
影响因子:
29
通讯作者:
Bohr VA
Bohr VA
中科院分区:
生物学1区
文献类型:
--
作者:
Fang EF;Kassahun H;Croteau DL;Scheibye-Knudsen M;Marosi K;Lu H;Shamanna RA;Kalyanasundaram S;Bollineni RC;Wilson MA;Iser WB;Wollman BN;Morevati M;Li J;Kerr JS;Lu Q;Waltz TB;Tian J;Sinclair DA;Mattson MP;Nilsen H;Bohr VA

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共济失调性毛细血管扩张症(A-T)是一种罕见的常染色体隐性遗传疾病,以进行性神经变性和小脑共济失调为特征。A-T与ATM缺陷有因果关系,ATM是DNA双链断裂反应和修复的主要调节因子。A-T患者小脑萎缩和神经变性的分子基础尚不清楚。在这里,我们报告和检查的意义增加PAR化,低NAD+和线粒体功能障碍的ATM缺陷小鼠和蠕虫。补充细胞内NAD+的治疗降低了A-T神经病理学的严重程度,使神经肌肉功能正常化,延迟记忆丧失并延长了两种动物模型的寿命。从机制上讲,增加细胞内NAD+的治疗也刺激神经元DNA修复并通过线粒体自噬改善线粒体质量。这项工作通过核DNA损伤诱导的核-线粒体信号转导将衰老的两个主要理论,DNA损伤积累和线粒体功能障碍联系起来,并证明它们是A-T过早衰老的重要病理生理决定因素,指向治疗干预。
Ataxia telangiectasia (A-T) is a rare autosomal recessive disease characterized by progressive neurodegeneration and cerebellar ataxia. A-T is causally linked to defects in ATM, a master regulator of the response to and repair of DNA double-strand breaks. The molecular basis of cerebellar atrophy and neurodegeneration in A-T patients is unclear. Here we report and examine the significance of increased PARylation, low NAD+ and mitochondrial dysfunction in ATM-deficient mice and worms. Treatments that replenish intracellular NAD+ reduce the severity of A-T neuropathology, normalize neuromuscular function, delay memory loss and extend lifespan in both animal models. Mechanistically, treatments that increase intracellular NAD+ also stimulate neuronal DNA repair and improve mitochondrial quality via mitophagy. This work links two major theories on aging, DNA damage accumulation and mitochondrial dysfunction through nuclear DNA damage-induced nuclear-mitochondrial signaling, and demonstrates that they are important pathophysiological determinants in premature aging of A-T, pointing to therapeutic interventions.
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