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Liu M, Bai J, He S, Villarreal R, Hu D, Zhang C, Yang X, Liang H, Slaga TJ, Yu Y, Zhou Z, Blenis J, Scherer PE, Dong LQ, Liu F. Grb10 promotes lipolysis and thermogenesis by phosphorylation-dependent feedback inhibition of mTORC1. Cell Metab 2014; 19:967-80. [PMID: 24746805 PMCID: PMC4064112 DOI: 10.1016/j.cmet.2014.03.018] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 01/21/2014] [Accepted: 03/13/2014] [Indexed: 12/14/2022]
Abstract
Identification of key regulators of lipid metabolism and thermogenic functions has important therapeutic implications for the current obesity and diabetes epidemic. Here, we show that Grb10, a direct substrate of mechanistic/mammalian target of rapamycin (mTOR), is expressed highly in brown adipose tissue, and its expression in white adipose tissue is markedly induced by cold exposure. In adipocytes, mTOR-mediated phosphorylation at Ser501/503 switches the binding preference of Grb10 from the insulin receptor to raptor, leading to the dissociation of raptor from mTOR and downregulation of mTOR complex 1 (mTORC1) signaling. Fat-specific disruption of Grb10 increased mTORC1 signaling in adipose tissues, suppressed lipolysis, and reduced thermogenic function. The effects of Grb10 deficiency on lipolysis and thermogenesis were diminished by rapamycin administration in vivo. Our study has uncovered a unique feedback mechanism regulating mTORC1 signaling in adipose tissues and identified Grb10 as a key regulator of adiposity, thermogenesis, and energy expenditure.
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Affiliation(s)
- Meilian Liu
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA; Metabolic Syndrome Research Center and Diabetes Center, Key Laboratory of Diabetes Immunology, Ministry of Education, Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan 410011, China
| | - Juli Bai
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA; Metabolic Syndrome Research Center and Diabetes Center, Key Laboratory of Diabetes Immunology, Ministry of Education, Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan 410011, China
| | - Sijia He
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA; Metabolic Syndrome Research Center and Diabetes Center, Key Laboratory of Diabetes Immunology, Ministry of Education, Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan 410011, China
| | - Ricardo Villarreal
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Derong Hu
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Chuntao Zhang
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA; The Department of Microbiology, School of Basic Medicine, Xinjiang Medical University, 393 Xinyi Road, Urumqi, Xinjiang 830011, China
| | - Xin Yang
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Huiyun Liang
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Thomas J Slaga
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Yonghao Yu
- Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA
| | - Zhiguang Zhou
- Metabolic Syndrome Research Center and Diabetes Center, Key Laboratory of Diabetes Immunology, Ministry of Education, Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan 410011, China
| | - John Blenis
- Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA
| | - Philipp E Scherer
- Touchstone Diabetes Center, Department of Internal Medicine, and Department of Cell Biology, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-8549, USA
| | - Lily Q Dong
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Feng Liu
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA; Metabolic Syndrome Research Center and Diabetes Center, Key Laboratory of Diabetes Immunology, Ministry of Education, Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan 410011, China.
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Rodrigues-Krause J, Krause M, O’Hagan C, De Vito G, Boreham C, Murphy C, Newsholme P, Colleran G. Divergence of intracellular and extracellular HSP72 in type 2 diabetes: does fat matter? Cell Stress Chaperones 2012; 17:293-302. [PMID: 22215518 PMCID: PMC3312959 DOI: 10.1007/s12192-011-0319-x] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 12/14/2011] [Accepted: 12/16/2011] [Indexed: 12/21/2022] Open
Affiliation(s)
- Josianne Rodrigues-Krause
- Biomedical Research Group, Department of Science, Institute of Technology Tallaght, Belgard Road, Tallaght, Dublin 24, Dublin, Ireland
- UCD School of Biomolecular and Biomedical Science, Conway Institute, Dublin, Ireland
| | - Mauricio Krause
- Biomedical Research Group, Department of Science, Institute of Technology Tallaght, Belgard Road, Tallaght, Dublin 24, Dublin, Ireland
- UCD School of Biomolecular and Biomedical Science, University College Dublin, Conway Institute, Dublin, Ireland
| | - C. O’Hagan
- Institute for Sport and Health, University College Dublin, Dublin, Ireland
| | - Giuseppe De Vito
- Institute for Sport and Health, University College Dublin, Dublin, Ireland
| | - Colin Boreham
- Institute for Sport and Health, University College Dublin, Dublin, Ireland
| | - Colin Murphy
- Biomedical Research Group, Department of Science, Institute of Technology Tallaght, Belgard Road, Tallaght, Dublin 24, Dublin, Ireland
| | - Philip Newsholme
- UCD School of Biomolecular and Biomedical Science, Conway Institute, Dublin, Ireland
- School of Biomedical Sciences, Curtin University, Perth, Australia
| | - Gerard Colleran
- Biomedical Research Group, Department of Science, Institute of Technology Tallaght, Belgard Road, Tallaght, Dublin 24, Dublin, Ireland
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