Abstract
Declining tissue nicotinamide adenine dinucleotide (NAD) levels are linked to ageing and its associated diseases. However, the mechanism for this decline is unclear. Here, we show that pro-inflammatory M1-like macrophages, but not naive or M2 macrophages, accumulate in metabolic tissues, including visceral white adipose tissue and liver, during ageing and acute responses to inflammation. These M1-like macrophages express high levels of the NAD-consuming enzyme CD38 and have enhanced CD38-dependent NADase activity, thereby reducing tissue NAD levels. We also find that senescent cells progressively accumulate in visceral white adipose tissue and liver during ageing and that inflammatory cytokines secreted by senescent cells (the senescence-associated secretory phenotype, SASP) induce macrophages to proliferate and express CD38. These results uncover a new causal link among resident tissue macrophages, cellular senescence and tissue NAD decline during ageing and offer novel therapeutic opportunities to maintain NAD levels during ageing.
Original language | English (US) |
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Pages (from-to) | 1265-1283 |
Number of pages | 19 |
Journal | Nature Metabolism |
Volume | 2 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2020 |
Funding
All authors have reviewed and approved the manuscript. C.B. is the inventor of intellectual property on the nutritional and therapeutic uses of NR, serves as chief scientific advisor of and holds stock in ChromaDex. E.V. is a scientific cofounder of NAPA Therapeutics. A.J.C., R.P., Q.W., E.S. and K.V. received partial salary support from NAPA Therapeutics. J.C. is a scientific cofounder of Unity Biotechnology. The other authors declare no competing interests. This project was supported by NIH grant R24DK085610 (E.V.), Gladstone Institute intramural funds (E.V.) and Buck Institute intramural funds (E.V. and J.C.). A.J.C. is a recipient of the UC President’s Postdoctoral Fellowship at UCSF and was supported by NIH training grant T32AG000266 (Buck Institute). A.K. was supported by the SENS Research Foundation and NIH grant R01AG051729 (J.C.). B.S. and N.B. were supported by NIH grant U01AG060906 (B.S., principal investigator) and NIH Shared Instrumentation Grant 1S10OD016281 (Buck Institute). M.S.S. and C.B. were supported by NIH grant R01HL147545 and the Roy J. Carver Trust to C.B. We thank M. Walter for help with imaging cells, and P. Dighe for help optimizing Seahorse assay conditions. We thank R. Camarda, V. Byles and D. Powell for reviewing the manuscript and helpful discussions.
ASJC Scopus subject areas
- Internal Medicine
- Endocrinology, Diabetes and Metabolism
- Physiology (medical)
- Cell Biology