Abstract:
:Chronic inflammation is a common feature of obesity, with elevated cytokines such as interleukin-1 (IL-1) in the circulation and tissues. Here, we report an unconventional IL-1R-MyD88-IRAK2-PHB/OPA1 signaling axis that reprograms mitochondrial metabolism in adipocytes to exacerbate obesity. IL-1 induced recruitment of IRAK2 Myddosome to mitochondria outer membranes via recognition by TOM20, followed by TIMM50-guided translocation of IRAK2 into mitochondria inner membranes, to suppress oxidative phosphorylation and fatty acid oxidation, thereby attenuating energy expenditure. Adipocyte-specific MyD88 or IRAK2 deficiency reduced high-fat-diet-induced weight gain, increased energy expenditure and ameliorated insulin resistance, associated with a smaller adipocyte size and increased cristae formation. IRAK2 kinase inactivation also reduced high-fat diet-induced metabolic diseases. Mechanistically, IRAK2 suppressed respiratory super-complex formation via interaction with PHB1 and OPA1 upon stimulation of IL-1. Taken together, our results suggest that the IRAK2 Myddosome functions as a critical link between inflammation and metabolism, representing a novel therapeutic target for patients with obesity.
journal_name
Nat Immunoljournal_title
Nature immunologyauthors
Zhou H,Wang H,Yu M,Schugar RC,Qian W,Tang F,Liu W,Yang H,McDowell RE,Zhao J,Gao J,Dongre A,Carman JA,Yin M,Drazba JA,Dent R,Hine C,Chen YR,Smith JD,Fox PL,Brown JM,Li Xdoi
10.1038/s41590-020-0750-1subject
Has Abstractpub_date
2020-10-01 00:00:00pages
1219-1231issue
10eissn
1529-2908issn
1529-2916pii
10.1038/s41590-020-0750-1journal_volume
21pub_type
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