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Critical role of Trib1 in differentiation of tissue-resident M2-like macrophages

Abstract

Macrophages consist of at least two subgroups, M1 and M2 (refs 1, 2, 3). Whereas M1 macrophages are proinflammatory and have a central role in host defence against bacterial and viral infections4,5, M2 macrophages are associated with responses to anti-inflammatory reactions, helminth infection, tissue remodelling, fibrosis and tumour progression6. Trib1 is an adaptor protein involved in protein degradation by interacting with COP1 ubiquitin ligase7. Genome-wide association studies in humans have implicated TRIB1 in lipid metabolism8,9,10. Here we show that Trib1 is critical for the differentiation of F4/80+MR+ tissue-resident macrophages—that share characteristics with M2 macrophages (which we term M2-like macrophages)—and eosinophils but not for the differentiation of M1 myeloid cells. Trib1 deficiency results in a severe reduction of M2-like macrophages in various organs, including bone marrow, spleen, lung and adipose tissues. Aberrant expression of C/EBPα in Trib1-deficient bone marrow cells is responsible for the defects in macrophage differentiation. Unexpectedly, mice lacking Trib1 in haematopoietic cells show diminished adipose tissue mass accompanied by evidence of increased lipolysis, even when fed a normal diet. Supplementation of M2-like macrophages rescues the pathophysiology, indicating that a lack of these macrophages is the cause of lipolysis. In response to a high-fat diet, mice lacking Trib1 in haematopoietic cells develop hypertriglyceridaemia and insulin resistance, together with increased proinflammatory cytokine gene induction. Collectively, these results demonstrate that Trib1 is critical for adipose tissue maintenance and suppression of metabolic disorders by controlling the differentiation of tissue-resident M2-like macrophages.

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Figure 1: Lack of tissue-resident M2-like macrophages and eosinophils in Trib1 -deficient mice.
Figure 2: Trib1 controls macrophage, eosinophil and neutrophil differentiation via the ubiquitin-binding domain.
Figure 3: Impact of Trib1 deficiency on lipodystrophy.
Figure 4: Mice lacking Trib1 in haematopoietic cells develop exacerbated metabolic disorders on a high-fat diet.

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Gene Expression Omnibus

Data deposits

Data have been deposited in the GEO under accession number GSE43563.

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Acknowledgements

We thank I. Shimomura and Y. Miyata for providing us with the key protocols for the metabolic experiments; T. Kitamura for providing the PlatE cells; M. Higa, H. Tanaka, N. Miyamoto, K. Miura, D. Ori, T. Uehata and K. Kuniyoshi for assistance with the experiments; and T. Kawai, S. Uematsu, T. Saitoh and Y. Kumagai for discussions. We also thank E. Kamada and M. Kageyama for secretarial assistance, and N. Umano, Y. Matsumoto and M. Kumagai for technical assistance. This work was supported by the Special Coordination Funds of the Japanese Ministry of Education, Culture, Sports, Science and Technology, and the Ministry of Health, Labour and Welfare in Japan, the Japan Society for the Promotion of Science through the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program).

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Authors

Contributions

T.S. designed and performed the experiments and wrote the manuscript. H.K., H.N. and N. Takakura performed the colony-forming assays. M.Y. generated the Trib1−/−, Trib2−/− and Trib3−/− mice. N. Takemura helped with experiments. K.N. performed microarray analysis. Y.Y. performed the MRI experiments. E.M. performed the histological analyses. O.T. and S.A. designed experiments and wrote the manuscript. S.A. supervised the project.

Corresponding author

Correspondence to Shizuo Akira.

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The authors declare no competing financial interests.

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Satoh, T., Kidoya, H., Naito, H. et al. Critical role of Trib1 in differentiation of tissue-resident M2-like macrophages. Nature 495, 524–528 (2013). https://doi.org/10.1038/nature11930

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