Nat Commun:SIRT6通过恢复能量稳态延缓衰老

2021-05-30 xiaozeng MedSci原创

既往研究显示,

既往研究显示,衰老与健康状况整体的下降、虚弱的增加相关,且是多种慢性病的主要危险因素。因此,深入了解衰老过程的相关分子机制对于干预措施的制定尤为重要,这些干预措施将有助于健康的保持和生存/寿命的改善。

越来越多的证据表明,饮食和新陈代谢是健康寿命的关键调节因素。饮食限制(DR)、在非营养不良情况下减少卡路里的摄入量(卡路里限制,CR)以及一些禁食方案,均可提供深远的健康益处并延长寿命。

衰老会导致体力活动的逐渐减少并破坏能量稳态。NAD+依赖的SIRT6脱酰基酶被报道可调控衰老和新陈代谢,然而其相关分子机制尚不清楚。

SIRT6调节小鼠的健康寿命

在该研究中,研究人员发现过表达SIRT6会导致B6小鼠模型的虚弱减少和寿命延长。生理学检测、体内多组学分析和13C乳酸追踪的研究发现,野生型小鼠的葡萄糖稳态和肝葡萄糖输出的年龄依赖性下降。相比之下,老年SIRT6转基因小鼠可通过改善两种主要的糖异生前体乳酸(lactate)和甘油(glycerol)的利用率来保持肝脏葡萄糖输出和葡萄糖稳态。

SIRT6激活肝脏线粒体分解代谢和抗炎通路

机制研究显示,SIRT6能够提高肝脏糖异生基因的表达水平,增加从头合成的NAD+,并全身性地增强脂肪组织中甘油的释放。


总而言之,该研究结果表明,SIRT6能够优化老年时的能量稳态,以延缓虚弱并保持健康。


原始出处:

Roichman, A., Elhanati, S., Aon, M.A. et al. Restoration of energy homeostasis by SIRT6 extends healthy lifespan. Nat Commun 12, 3208 (28 May 2021).

 

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    2022-05-10 liuli5079
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    2021-06-28 changfy
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    2021-07-09 chenshujs
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    2022-02-04 liye789132251

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