Journal
SCIENCE
Volume 360, Issue 6389, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan5780
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Funding
- NIH/NIDDK [R01 DK058110]
- Cecil H. and Ida Green Center for Reproductive Biology Sciences Endowment
- NIH/NCI [R35 CA22044901]
- Howard Hughes Medical Institute Faculty Scholars Program
- NATIONAL CANCER INSTITUTE [R35CA220449, R01CA157996] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES [R01DK058110, R01DK069710] Funding Source: NIH RePORTER
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NAD(+) (nicotinamide adenine dinucleotide in its oxidized state) is an essential molecule for a variety of physiological processes. It is synthesized in distinct subcellular compartments by three different synthases (NMNAT-1, -2, and -3). We found that compartmentalized NAD(+) synthesis by NMNATs integrates glucose metabolism and adipogenic transcription during adipocyte differentiation. Adipogenic signaling rapidly induces cytoplasmic NMNAT-2, which competes with nuclear NMNAT-1 for the common substrate, nicotinamide mononucleotide, leading to a precipitous reduction in nuclear NAD(+) levels. This inhibits the catalytic activity of poly[adenosine diphosphate (ADP)-ribose] polymerase-1 (PARP-1), a NAD(+)-dependent enzyme that represses adipogenic transcription by ADP-ribosylating the adipogenic transcription factor C/EBPb. Reversal of PARP-1-mediated repression by NMNAT-2-mediated nuclear NAD(+) depletion in response to adipogenic signals drives adipogenesis. Thus, compartmentalized NAD(+) synthesis functions as an integrator of cellular metabolism and signal-dependent transcriptional programs.
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