期刊
CELL METABOLISM
卷 31, 期 3, 页码 564-+出版社
CELL PRESS
DOI: 10.1016/j.cmet.2020.02.001
关键词
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资金
- Intramural Research Program of the National Institute of Environmental Health Sciences of the NIH [Z01 ES102205]
- Nanjing Medical University
- National Institute of Environmental Health Sciences
- NATIONAL INSTITUTE OF ENVIRONMENTAL HEALTH SCIENCES [ZICES103005, ZIAES102205, ZIAES101765] Funding Source: NIH RePORTER
Nicotinamide adenine dinucleotide (NAD), a cofactor for hundreds of metabolic reactions in all cell types, plays an essential role in metabolism, DNA repair, and aging. However, how NAD metabolism is impacted by the environment remains unclear. Here, we report an unexpected trans-kingdom cooperation between bacteria and mammalian cells wherein bacteria contribute to host NAD biosynthesis. Bacteria confer resistance to inhibitors of NAMPT, the rate-limiting enzyme in the amidated NAD salvage pathway, in cancer cells and xenograft tumors. Mechanistically, a microbial nicotinamidase (PncA) that converts nicotinamide to nicotinic acid, a precursor in the alternative deamidated NAD salvage pathway, is necessary and sufficient for this protective effect. Using stable isotope tracing and microbiota-depleted mice, we demonstrate that this bacteria-mediated deamidation contributes substantially to the NAD-boosting effect of oral nicotinamide and nicotinamide riboside supplementation in several tissues. Collectively, our findings reveal an important role of bacteria-enabled deamidated pathway in host NAD metabolism.
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