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Saito N, Kimura S, Miyamoto T, Fukushima S, Amagasa M, Shimamoto Y, Nishioka C, Okamoto S, Toda C, Washio K, Asano A, Miyoshi I, Takahashi E, Kitamura H. Macrophage ubiquitin-specific protease 2 modifies insulin sensitivity in obese mice. Biochem Biophys Rep 2017; 9:322-329. [PMID: 28956020 PMCID: PMC5614627 DOI: 10.1016/j.bbrep.2017.01.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 12/24/2016] [Accepted: 01/23/2017] [Indexed: 12/17/2022] Open
Abstract
We previously reported that ubiquitin-specific protease (USP) 2 in macrophages down-regulates genes associated with metabolic diseases, suggesting a putative anti-diabetic role for USP2 in macrophages. In this study, we evaluate this role at both cellular and individual levels. Isolated macrophages forcibly expressing Usp2a, a longer splicing variant of USP2, failed to modulate the insulin sensitivity of 3T3-L1 adipocytes. Similarly, macrophage-selective overexpression of Usp2a in mice (Usp2a transgenic mice) had a negligible effect on insulin sensitivity relative to wild type littermates following a three-month high-fat diet. However, Usp2a transgenic mice exhibited fewer M1 macrophages in their mesenteric adipose tissue. Following a six-month high-fat diet, Usp2a transgenic mice exhibited a retarded progression of insulin resistance in their skeletal muscle and liver, and an improvement in insulin sensitivity at an individual level. Although conditioned media from Usp2a-overexpressing macrophages did not directly affect the insulin sensitivity of C2C12 myotubes compared to media from control macrophages, they did increase the insulin sensitivity of C2C12 cells after subsequent conditioning with 3T3-L1 cells. These results indicate that macrophage USP2A hampers obesity-elicited insulin resistance via an adipocyte-dependent mechanism. USP2A controls macrophage population in mesenteric adipose tissue during obesity. Overexpression of USP2A in macrophages retards progression of insulin resistance. Overexpression of USP2A in macrophages represses high-fat diet-induced obesity. Macrophage USP2A controls insulin sensitivity of muscle dependent on adipocytes.
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Key Words
- DMEM, Dulbecco's modified Eagle medium
- Diabetes
- ELISA, enzyme-linked immunosorbent assay
- GAPDH, glyceraldehyde 3-phosphate dehydrogenase
- HFD, high-fat diet
- HOMA-IR, homeostatic model assessment as an index of insulin resistance
- IL, interleukin
- IR, insulin receptor
- IRS, insulin receptor substrate
- Insulin
- KD, knock down
- KO, knockout
- Macrophage
- NCD, normal chow diet
- NEFA, nonesterified fatty acid
- Obesity
- PDK, phosphoinositide-dependent kinase
- PI3K, phosphatidylinositol 3-phosphate kinase
- SOCS, suppressor of cytokine signaling
- T2DM, type 2 diabetes mellitus
- Tg, transgenic
- USP
- USP, ubiquitin-specific protease
- pAkt, phosphorylated Akt
- pIRβ, phosphorylated insulin receptor β chain
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Affiliation(s)
- Natsuko Saito
- Laboratory of Veterinary Physiology, Department of Veterinary Medicine, and Laboratory of Animal Therapeutics, Japan
| | - Shunsuke Kimura
- Laboratory of Histology and Cytology, Department of Functional Morphology, Graduate School of Medical Sciences, Hokkaido University, Kita15, Nishi7, Kita-ku, Sapporo, Hokkaido 060-8638, Japan
| | - Tomomi Miyamoto
- Department of Comparative and Experimental Medicine, Graduate School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan
| | - Sanae Fukushima
- Research Resources Center, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Misato Amagasa
- Laboratory of Veterinary Physiology, Department of Veterinary Medicine, and Laboratory of Animal Therapeutics, Japan
| | - Yoshinori Shimamoto
- Department of Veterinary Science, Rakuno Gakuen University, 582 Midorimachi, Bunkyodai, Ebetsu, Hokkaido 069-8501, Japan
| | - Chieko Nishioka
- Research Resources Center, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Shiki Okamoto
- Division of Endocrinology and Metabolism, National Institute for Physiological Sciences, 38 Nishigonaka Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Chitoku Toda
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520-8063, USA
| | - Kohei Washio
- Laboratory of Veterinary Physiology, Department of Veterinary Medicine, and Laboratory of Animal Therapeutics, Japan
| | - Atsushi Asano
- Laboratory of Laboratory Animal, Department of Basic Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Ichiro Miyoshi
- Department of Comparative and Experimental Medicine, Graduate School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan
| | - Eiki Takahashi
- Research Resources Center, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Hiroshi Kitamura
- Laboratory of Veterinary Physiology, Department of Veterinary Medicine, and Laboratory of Animal Therapeutics, Japan.,Laboratory of Histology and Cytology, Department of Functional Morphology, Graduate School of Medical Sciences, Hokkaido University, Kita15, Nishi7, Kita-ku, Sapporo, Hokkaido 060-8638, Japan.,Department of Comparative and Experimental Medicine, Graduate School of Medicine, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan
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