期刊
AGING CELL
卷 13, 期 6, 页码 1075-1085出版社
WILEY-BLACKWELL
DOI: 10.1111/acel.12273
关键词
aging; dietary restriction; C. elegans; stress response; sirtuins; NAD(+)
资金
- NIH [P40 OD010440, GM062891, GM078171, AG028730]
- Joslin Diabetes Center [T32DK007260]
- Ellison Medical Foundation
- NIDDK DRC [P30DK036836]
- Paul F. Glenn Foundation for Medical Research
- United Mitochondrial Disease Foundation
- Juvenile Diabetes Foundation
Interventions that slow aging and prevent chronic disease may come from an understanding of how dietary restriction (DR) increases lifespan. Mechanisms proposed to mediate DR longevity include reduced mTOR signaling, activation of the NAD(+)-dependent deacylases known as sirtuins, and increases in NAD(+) that derive from higher levels of respiration. Here, we explored these hypotheses in Caenorhabditis elegans using a new liquid feeding protocol. DR lifespan extension depended upon a group of regulators that are involved in stress responses and mTOR signaling, and have been implicated in DR by some other regimens [DAF-16 (FOXO), SKN-1 (Nrf1/2/3), PHA-4 (FOXA), AAK-2 (AMPK)]. Complete DR lifespan extension required the sirtuin SIR-2.1 (SIRT1), the involvement of which in DR has been debated. The nicotinamidase PNC-1, a key NAD(+) salvage pathway component, was largely required for DR to increase lifespan but not two healthspan indicators: movement and stress resistance. Independently of pnc-1, DR increased the proportion of respiration that is coupled to ATP production but, surprisingly, reduced overall oxygen consumption. We conclude that stress response and NAD(+)-dependent mechanisms are each critical for DR lifespan extension, although some healthspan benefits do not require NAD(+) salvage. Under DR conditions, NAD(+)-dependent processes may be supported by a DR-induced shift toward oxidative metabolism rather than an increase in total respiration.
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