Abstract
In yeast, increasing the copy number of the nicotinamide adenine dinucleotide (NAD)-dependent deacetylase Sir2 extends lifespan, which can be inhibited by nicotinamide (Nam), the end-product of Sir2-mediated NAD-breakdown. Furthermore, the yeast pyrazinamidase/nicotinamidase PNC-1 can extend yeast lifespan by converting Nam. In Caenorhabditis elegans ( C. elegans), increased dosage of the gene encoding SIR-2.1 also increases lifespan. Here, we report that knockdown of the C. elegans homologue of yeast PNC-1 as well as growing worms on Nam-containing medium significantly decreases adult lifespan. Accordingly, increased gene dosage of pnc-1 increases adult survival under conditions of oxidative stress. These data show for the first time the involvement of PNC-1/Nam in the survival of a multicellular organism and may also contribute to our understanding of lifespan regulation in mammals.
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