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SARM1 regulates NAD-linked metabolism and select immune genes in macrophages. | LitMetric

SARM1 regulates NAD-linked metabolism and select immune genes in macrophages.

J Biol Chem

School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland. Electronic address:

Published: February 2024

AI Article Synopsis

Article Abstract

Sterile alpha and HEAT/armadillo motif-containing protein (SARM1) was recently described as a NAD-consuming enzyme and has previously been shown to regulate immune responses in macrophages. Neuronal SARM1 is known to contribute to axon degeneration due to its NADase activity. However, how SARM1 affects macrophage metabolism has not been explored. Here, we show that macrophages from Sarm1 mice display elevated NAD concentrations and lower cyclic ADP-ribose, a known product of SARM1-dependent NAD catabolism. Further, SARM1-deficient macrophages showed an increase in the reserve capacity of oxidative phosphorylation and glycolysis compared to WT cells. Stimulation of macrophages to a proinflammatory state by lipopolysaccharide (LPS) revealed that SARM1 restricts the ability of macrophages to upregulate glycolysis and limits the expression of the proinflammatory gene interleukin (Il) 1b, but boosts expression of anti-inflammatory Il10. In contrast, we show macrophages lacking SARM1 induced to an anti-inflammatory state by IL-4 stimulation display increased oxidative phosphorylation and glycolysis, and reduced expression of the anti-inflammatory gene, Fizz1. Overall, these data show that SARM1 fine-tunes immune gene transcription in macrophages via consumption of NAD and altered macrophage metabolism.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10847163PMC
http://dx.doi.org/10.1016/j.jbc.2023.105620DOI Listing

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