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J Biol Chem. 2018 Dec 7;293(49):18933-18943. doi: 10.1074/jbc.RA118.004578. Epub 2018 Oct 17.

c-Jun N-terminal kinase (JNK)-mediated phosphorylation of SARM1 regulates NAD+ cleavage activity to inhibit mitochondrial respiration.

Author information

1
From the Department of Cell Biology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan.
2
From the Department of Cell Biology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan masa-s@md.okayama-u.ac.jp.

Abstract

Mitochondrial dysfunction is a key pathological feature of many different types of neurodegenerative disease. Sterile alpha and Toll/interleukin receptor motif-containing protein 1 (SARM1) has been attracting much attention as an important molecule for inducing axonal degeneration and neuronal cell death by causing loss of NAD (NADH). However, it has remained unclear what exactly regulates the SARM1 activity. Here, we report that NAD+ cleavage activity of SARM1 is regulated by its own phosphorylation at serine 548. The phosphorylation of SARM1 was mediated by c-jun N-terminal kinase (JNK) under oxidative stress conditions, resulting in inhibition of mitochondrial respiration concomitant with enhanced activity of NAD+ cleavage. Nonphosphorylatable mutation of Ser-548 or treatment with a JNK inhibitor decreased SARM1 activity. Furthermore, neuronal cells derived from a familial Parkinson's disease (PD) patient showed a congenitally increased level of SARM1 phosphorylation compared with that in neuronal cells from a healthy person and were highly sensitive to oxidative stress. These results indicate that JNK-mediated phosphorylation of SARM1 at Ser-548 is a regulator of SARM1 leading to inhibition of mitochondrial respiration. These findings suggest that an abnormal regulation of SARM1 phosphorylation is involved in the pathogenesis of Parkinson's disease and possibly other neurodegenerative diseases.

KEYWORDS:

ATP; NAD+; SARM1; c-Jun N-terminal kinase (JNK); cell death; mitochondria; nicotinamide adenine dinucleotide (NAD)

PMID:
30333228
PMCID:
PMC6295714
[Available on 2019-12-07]
DOI:
10.1074/jbc.RA118.004578
[Indexed for MEDLINE]

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