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Cell. 2007 Sep 21;130(6):1095-107.

Nutrient-sensitive mitochondrial NAD+ levels dictate cell survival.

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  • 1Department of Pathology, Paul F. Glenn Laboratories, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.

Abstract

A major cause of cell death caused by genotoxic stress is thought to be due to the depletion of NAD(+) from the nucleus and the cytoplasm. Here we show that NAD(+) levels in mitochondria remain at physiological levels following genotoxic stress and can maintain cell viability even when nuclear and cytoplasmic pools of NAD(+) are depleted. Rodents fasted for 48 hr show increased levels of the NAD(+) biosynthetic enzyme Nampt and a concomitant increase in mitochondrial NAD(+). Increased Nampt provides protection against cell death and requires an intact mitochondrial NAD(+) salvage pathway as well as the mitochondrial NAD(+)-dependent deacetylases SIRT3 and SIRT4. We discuss the relevance of these findings to understanding how nutrition modulates physiology and to the evolution of apoptosis.

PMID:
17889652
[PubMed - indexed for MEDLINE]
PMCID:
PMC3366687
Free PMC Article

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