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Liu X, Li S, Cui Q, Guo B, Ding W, Liu J, Quan L, Li X, Xie P, Jin L, Sheng Y, Chen W, Wang K, Zeng F, Qiu Y, Liu C, Zhang Y, Lv F, Hu X, Xiao RP. Activation of GPR81 by lactate drives tumour-induced cachexia. Nat Metab 2024; 6:708-723. [PMID: 38499763 PMCID: PMC11052724 DOI: 10.1038/s42255-024-01011-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 02/13/2024] [Indexed: 03/20/2024]
Abstract
Cachexia affects 50-80% of patients with cancer and accounts for 20% of cancer-related death, but the underlying mechanism driving cachexia remains elusive. Here we show that circulating lactate levels positively correlate with the degree of body weight loss in male and female patients suffering from cancer cachexia, as well as in clinically relevant mouse models. Lactate infusion per se is sufficient to trigger a cachectic phenotype in tumour-free mice in a dose-dependent manner. Furthermore, we demonstrate that adipose-specific G-protein-coupled receptor (GPR)81 ablation, similarly to global GPR81 deficiency, ameliorates lactate-induced or tumour-induced adipose and muscle wasting in male mice, revealing adipose GPR81 as the major mediator of the catabolic effects of lactate. Mechanistically, lactate/GPR81-induced cachexia occurs independently of the well-established protein kinase A catabolic pathway, but it is mediated by a signalling cascade sequentially activating Gi-Gβγ-RhoA/ROCK1-p38. These findings highlight the therapeutic potential of targeting GPR81 for the treatment of this life-threatening complication of cancer.
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Affiliation(s)
- Xidan Liu
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Shijin Li
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Qionghua Cui
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Bujing Guo
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Wanqiu Ding
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Jie Liu
- Dazhou Central Hospital, Sichuan, China
| | - Li Quan
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Xiaochuan Li
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Peng Xie
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Li Jin
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Ye Sheng
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Wenxin Chen
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Kai Wang
- Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | | | - Yifu Qiu
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
- Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Changlu Liu
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Yan Zhang
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Fengxiang Lv
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China
| | - Xinli Hu
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China.
| | - Rui-Ping Xiao
- Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing, China.
- Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China.
- State Key Laboratory of Membrane Biology, Peking University, Beijing, China.
- Beijing City Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, Beijing, China.
- PKU-Nanjing Institute of Translational Medicine, Nanjing, China.
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2
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Nie T, Lu J, Zhang H, Mao L. Latest advances in the regulatory genes of adipocyte thermogenesis. Front Endocrinol (Lausanne) 2023; 14:1250487. [PMID: 37680891 PMCID: PMC10482227 DOI: 10.3389/fendo.2023.1250487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 08/07/2023] [Indexed: 09/09/2023] Open
Abstract
An energy imbalance cause obesity: more energy intake or less energy expenditure, or both. Obesity could be the origin of many metabolic disorders, such as type 2 diabetes and cardiovascular disease. UCP1 (uncoupling protein1), which is highly and exclusively expressed in the thermogenic adipocytes, including beige and brown adipocytes, can dissipate proton motive force into heat without producing ATP to increase energy expenditure. It is an attractive strategy to combat obesity and its related metabolic disorders by increasing non-shivering adipocyte thermogenesis. Adipocyte thermogenesis has recently been reported to be regulated by several new genes. This work provided novel and potential targets to activate adipocyte thermogenesis and resist obesity, such as secreted proteins ADISSP and EMC10, enzyme SSU72, etc. In this review, we have summarized the latest research on adipocyte thermogenesis regulation to shed more light on this topic.
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Affiliation(s)
- Tao Nie
- School of Basic Medicine, Hubei University of Arts and Science, Xiangyang, China
| | - Jinli Lu
- Scientific Research Center, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China
| | - Hua Zhang
- Department of Medical Iconography, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Liufeng Mao
- Scientific Research Center, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China
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3
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Egusa G, Ohno H, Nagano G, Sagawa J, Shinjo H, Yamamoto Y, Himeno N, Morita Y, Kanai A, Baba R, Kobuke K, Oki K, Yoneda M, Hattori N. Selective activation of PPARα maintains thermogenic capacity of beige adipocytes. iScience 2023; 26:107143. [PMID: 37456852 PMCID: PMC10338232 DOI: 10.1016/j.isci.2023.107143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 04/17/2023] [Accepted: 06/12/2023] [Indexed: 07/18/2023] Open
Abstract
Beige adipocytes are inducible thermogenic adipocytes used for anti-obesity treatment. Beige adipocytes rapidly lose their thermogenic capacity once external cues are removed. However, long-term administration of stimulants, such as PPARγ and β-adrenergic receptor agonists, is unsuitable due to various side effects. Here, we reported that PPARα pharmacological activation was the preferred target for maintaining induced beige adipocytes. Pemafibrate used in clinical practice for dyslipidemia was developed as a selective PPARα modulator (SPPARMα). Pemafibrate administration regulated the thermogenic capacity of induced beige adipocytes, repressed body weight gain, and ameliorated impaired glucose tolerance in diet-induced obese mouse models. The transcriptome analysis revealed that the E-twenty-six transcription factor ELK1 acted as a cofactor of PPARα. ELK1 was mobilized to the Ucp1 transcription regulatory region with PPARα and modulated its expression by pemafibrate. These results suggest that selective activation of PPARα by pemafibrate is advantageous to maintain the function of beige adipocytes.
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Affiliation(s)
- Gentaro Egusa
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Haruya Ohno
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Gaku Nagano
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Junji Sagawa
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Hiroko Shinjo
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Yutaro Yamamoto
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Natsumi Himeno
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Yoshimi Morita
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Akinori Kanai
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - Ryuta Baba
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kazuhiro Kobuke
- Department of Preventive Medicine for Diabetes and Lifestyle-related Diseases, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kenji Oki
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Masayasu Yoneda
- Department of Preventive Medicine for Diabetes and Lifestyle-related Diseases, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Noboru Hattori
- Department of Molecular and Internal Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
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4
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Scamfer SR, Lee MD, Hilgendorf KI. Ciliary control of adipocyte progenitor cell fate regulates energy storage. Front Cell Dev Biol 2022; 10:1083372. [PMID: 36561368 PMCID: PMC9763467 DOI: 10.3389/fcell.2022.1083372] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022] Open
Abstract
The primary cilium is a cellular sensory organelle found in most cells in our body. This includes adipocyte progenitor cells in our adipose tissue, a complex organ involved in energy storage, endocrine signaling, and thermogenesis. Numerous studies have shown that the primary cilium plays a critical role in directing the cell fate of adipocyte progenitor cells in multiple adipose tissue types. Accordingly, diseases with dysfunctional cilia called ciliopathies have a broad range of clinical manifestations, including obesity and diabetes. This review summarizes our current understanding of how the primary cilium regulates adipocyte progenitor cell fate in multiple contexts and illustrates the importance of the primary cilium in regulating energy storage and adipose tissue function.
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Affiliation(s)
| | | | - Keren I. Hilgendorf
- Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT, United States
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5
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Nikolic M, Novakovic J, Ramenskaya G, Kokorekin V, Jeremic N, Jakovljevic V. Cooling down with Entresto. Can sacubitril/valsartan combination enhance browning more than coldness? Diabetol Metab Syndr 2022; 14:175. [PMID: 36419097 PMCID: PMC9686067 DOI: 10.1186/s13098-022-00944-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 11/04/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND It is a growing importance to induce a new treatment approach to encourage weight loss but also to improve maintenance of lost weight. It has been shown that promotion of brown adipose tissue (BAT) function or acquisition of BAT characteristics in white adipose tissue (terms referred as "browning") can be protective against obesity. MAIN TEXT Amongst numerous established environmental influences on BAT activity, cold exposure is the best interested technique due to its not only effects on of BAT depots in proliferation process but also de novo differentiation of precursor cells via β-adrenergic receptor activation. A novel combination drug, sacubitril/valsartan, has been shown to be more efficient in reducing cardiovascular events and heart failure readmission compared to conventional therapy. Also, this combination of drugs increases the postprandial lipid oxidation contributing to energy expenditure, promotes lipolysis in adipocytes and reduces body weight. To date, there is no research examining potential of combined sacubitril/valsartan use to promote browning or mechanisms in the basis of this thermogenic process. CONCLUSION Due to the pronounced effects of cold and sacubitril/valsartan treatment on function and metabolism of BAT, the primary goal of further research should focused on investigation of the synergistic effects of the sacubitril/valsartan treatment at low temperature environmental conditions.
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Affiliation(s)
- Marina Nikolic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Jovana Novakovic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | | | | | - Nevena Jeremic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia.
- First Moscow State Medical University IM Sechenov, Moscow, Russia.
| | - Vladimir Jakovljevic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
- Department of Human Pathology, First Moscow State Medical University IM Sechenov, Moscow, Russia
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6
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Hiraike Y, Tsutsumi S, Wada T, Oguchi M, Saito K, Nakamura M, Ota S, Koebis M, Nakao H, Aiba A, Nagano G, Ohno H, Oki K, Yoneda M, Kadowaki T, Aburatani H, Waki H, Yamauchi T. NFIA determines the cis-effect of genetic variation on Ucp1 expression in murinethermogenic adipocytes. iScience 2022; 25:104729. [PMID: 35874098 PMCID: PMC9304612 DOI: 10.1016/j.isci.2022.104729] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/17/2022] [Accepted: 07/01/2022] [Indexed: 11/04/2022] Open
Abstract
Thermogenic brown and beige adipocytes counteract obesity by enhancing energy dissipation via uncoupling protein-1 (Ucp1). However, the effect of genetic variation on these cells, a major source of disease susceptibility, has been less well studied. Here we examined beige adipocytes from obesity-prone C57BL/6J (B6) and obesity-resistant 129X1/SvJ (129) mouse strains and identified a cis-regulatory variant rs47238345 that is responsible for differential Ucp1 expression. The alternative T allele of rs47238345 at the Ucp1 -12kb enhancer in 129 facilitates the allele-specific binding of nuclear factor I-A (NFIA) to mediate allele-specific enhancer-promoter interaction and Ucp1 transcription. Furthermore, CRISPR-Cas9/Cpf1-mediated single nucleotide polymorphism (SNP) editing of rs47238345 resulted in increased Ucp1 expression. We also identified Lim homeobox protein 8 (Lhx8), whose expression is higher in 129 than in B6, as a trans-acting regulator of Ucp1 in mice and humans. These results demonstrate the cis- and trans-acting effects of genetic variation on Ucp1 expression that underlie phenotypic diversity. NFIA in adipocytes determines Ucp1 expression between obesity-prone and -resistant mouse strains Allele-specific binding of NFIA at the Ucp1 -12kb enhancer mediates differential Ucp1 expression Editing of a SNP at the Ucp1 -12kb enhancer is sufficient to increase Ucp1 in obesity-prone strain
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Affiliation(s)
- Yuta Hiraike
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan.,Division for Health Service Promotion, the University of Tokyo, Tokyo 113-0033, Japan
| | - Shuichi Tsutsumi
- Genome Science and Medicine Laboratory, Research Center for Advanced Science and Technology, the University of Tokyo, Tokyo 153-8904, Japan
| | - Takahito Wada
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan
| | - Misato Oguchi
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan
| | - Kaede Saito
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan
| | - Masahiro Nakamura
- Precision Health, Department of Bioengineering, Graduate School of Engineering, the University of Tokyo, Tokyo 113-8655, Japan
| | - Satoshi Ota
- Genome Science and Medicine Laboratory, Research Center for Advanced Science and Technology, the University of Tokyo, Tokyo 153-8904, Japan
| | - Michinori Koebis
- Laboratory of Animal Resources, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo 113-0033, Japan
| | - Harumi Nakao
- Laboratory of Animal Resources, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo 113-0033, Japan
| | - Atsu Aiba
- Laboratory of Animal Resources, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, the University of Tokyo, Tokyo 113-0033, Japan
| | - Gaku Nagano
- Department of Molecular and Internal Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan
| | - Haruya Ohno
- Department of Molecular and Internal Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan
| | - Kenji Oki
- Department of Molecular and Internal Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan
| | - Masayasu Yoneda
- Department of Molecular and Internal Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan
| | - Takashi Kadowaki
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan.,Department of Prevention of Diabetes and Lifestyle-Related Diseases, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan.,Toranomon Hospital, Tokyo 105-8470, Japan
| | - Hiroyuki Aburatani
- Genome Science and Medicine Laboratory, Research Center for Advanced Science and Technology, the University of Tokyo, Tokyo 153-8904, Japan
| | - Hironori Waki
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan.,Department of Diabetes and Endocrinology, Akita University Graduate School of Medicine, Akita 010-8543, Japan
| | - Toshimasa Yamauchi
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8655, Japan
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7
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Leng Q, Zhou J, Li C, Xu Y, Liu L, Zhu Y, Yang Y, Zhang H, Li X. Dihydromyricetin ameliorates diet-induced obesity and promotes browning of white adipose tissue by upregulating IRF4/PGC-1α. Nutr Metab (Lond) 2022; 19:38. [PMID: 35690863 PMCID: PMC9188085 DOI: 10.1186/s12986-022-00672-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 05/28/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Promoting the browning of white adipose tissue (WAT) is a promising approach for the treatment of obesity and related comorbidities because it increases energy expenditure. In this study, we investigated whether Dihydromyricetin (DHM), a flavonoid component, could ameliorate diet-induced obesity through promoting the browning of WAT. METHODS Male C57BL/6 J mice were received a high-fat diet (HFD) to induce obesity and subsequently were treated with DHM (100 mg/kg/day) or vehicle for 4 weeks. The effects of DHM on weight reduction and metabolic phenotype improvement were observed in the mice. The expression of genes and protein involved in browning of WAT were assessed in inguinal WAT (iWAT) of the mice. Then, the effect of DHM on the inducing browning program was verified in adipocytes differentiated from stromal vascular fraction (SVF) cells of mouse iWAT. Finally, the mechanism by which DHM improves the browning of WAT was explored using RNA-seq and luciferase reporter assay. RESULTS We find that DHM reduces body weight, decreases WAT mass, improves glucose and lipid metabolic disorders, and ameliorates hepatic steatosis in diet-induced obese (DIO) mice. Further studies show that DHM induces WAT browning, which is manifested by increased expression of uncoupling protein 1 (UCP1) and peroxisome proliferator-activated receptor gamma coactivator (PGC)-1α and enhanced mitochondrial activity in iWAT and primary adipocytes. In addition, we also find that DHM enhances interferon regulatory factor 4 (IRF4) expression, which is a key transcriptional regulator of PGC-1α. CONCLUSION Our findings identify that DHM prevents obesity by inducing the browning of WAT through the upregulation of IRF4/PGC-1α, which may have potential therapeutic implications for the treatment of obesity.
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Affiliation(s)
- Qingyang Leng
- Department of Endocrinology, Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jianhua Zhou
- Department of Endocrinology, Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Chang Li
- Department of Endocrinology, Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yanhong Xu
- Department of Endocrinology, Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Lu Liu
- Department of Endocrinology, Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yi Zhu
- Department of Endocrinology, Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Ying Yang
- Department of Endocrinology and Metabolism, Shanghai Clinical Center for Diabetes, Shanghai Key Clinical Center for Metabolic Disease, Shanghai Diabetes Institute, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Hongli Zhang
- Department of Endocrinology, Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Xiaohua Li
- Department of Endocrinology, Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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8
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NNMT is induced dynamically during beige adipogenesis in adipose tissues depot-specific manner. J Physiol Biochem 2021; 78:169-183. [PMID: 34699038 DOI: 10.1007/s13105-021-00851-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 10/03/2021] [Indexed: 10/20/2022]
Abstract
Nicotinamide N-methyltransferase (NNMT) is a novel regulator, shown recently to regulate adipose tissue energy expenditure partly through changing NAD + content, which is essential for mitochondrial. We determine whether NNMT plays important role in energy metabolism during the beige adipogenesis in vivo and in vitro. Male C57BL/6 mice at 8 weeks old were exposed to 4 ℃ for 1, 2, 3, 4, and 5 days, respectively. Interscapular brown adipose tissue (iBAT), inguinal subcutaneous WAT (sWAT), and epididymal WAT (eWAT) were harvested for gene and protein expression analysis and the correlation analysis. In addition, cultured primary mice brown adipocyte (BA) and white adipocyte (WA) treated with or without β3-adrenoceptor agonist (CL316, 243) were also harvested for these analyses. A combination of NNMT and its related genetic (Nmnat1, Nampt, Cyp2e1, Nrk1, Cd38) and proteic analyses and also the NAD + levels demonstrated the dynamical and depot-specific remodeling of NAD metabolism in different adipose tissues in response to cold exposure. While upon CL316, 243 treatment, gene expression of Nnmt, Nampt, Cyp2e1, and Nrk1 was all significantly decreased in WA but not in BA. The increased NAD + amount in BA and WA during the beige adipogenesis was observed. Besides, it is demonstrated that the expression of NNMT both in sWAT and WA showed significant negative correlation with browning markers UCP-1 and PGC-1α at protein levels. Above all, NNMT was induced in WAT during the 'cold remodeling' phase and correlated negatively with the process of browning in sWAT and WA, indicating the specific role of NNMT in the regulation of energy homeostasis during the process of beige adipogenesis.
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9
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FGF2 disruption enhances thermogenesis in brown and beige fat to protect against adiposity and hepatic steatosis. Mol Metab 2021; 54:101358. [PMID: 34710640 PMCID: PMC8605413 DOI: 10.1016/j.molmet.2021.101358] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 10/13/2021] [Accepted: 10/15/2021] [Indexed: 12/12/2022] Open
Abstract
Objective Fibroblast growth factor 2 (FGF2) has been reported to play divergent roles in white adipogenic differentiation, however, whether it regulates thermogenesis of fat tissues remains largely unknown. We therefore aimed to investigate the effect of FGF2 on fat thermogenesis and elucidate the underlying mechanisms. Methods FGF2-KO and wild-type (WT) mice were fed with chow diet and high-fat diet (HFD) for 14 weeks. The brown and white fat mass, thermogenic capability, respiratory exchange ratio, and hepatic fat deposition were determined. In vitro experiments were conducted to compare the thermogenic ability of FGF2-KO- with WT-derived brown and white adipocytes. Exogenous FGF2 was supplemented to in vitro-cultured WT brown and ISO-induced beige adipocytes. The FGFR inhibitor, PPARγ agonist, and PGC-1α expression lentivirus were used with the aid of technologies including Co-IP, ChIP, and luciferase reporter assay to elucidate the mechanisms underlying the FGF2 regulation of thermogenesis. Results FGF2 gene disruption results in increased thermogenic capability in both brown and beige fat, supporting by increased UCP1 expression, enhanced respiratory exchange ratio, and elevated thermogenic potential in response to cold exposure. Thus, the deletion of FGF2 protects mice from high fat-induced adiposity and hepatic steatosis. Mechanistically, in vitro investigations indicated FGF2 acts in autocrine/paracrine fashions. Exogenous FGF2 supplementation inhibits both PGC-1α and PPARγ expression, leading to suppression of UCP1 expression in brown and beige adipocytes. Conclusions These findings demonstrate that FGF2 is a novel thermogenic regulator, suggesting a viable potential strategy for using FGF2-selective inhibitors in combat adiposity and associated hepatic steatosis. FGF2-KO mice show potentiated stimulation on thermogenic capability under both basal and cold challenge stimulation. FGF2 disruption protected mice against HFD-induced adiposity and hepatic steatosis. FGF2 acts in autocrine/paracrine fashions in vitro. Both PPARγ and PGC-1α play roles in FGF2 suppression of thermogenesis.
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10
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Sun W, Modica S, Dong H, Wolfrum C. Plasticity and heterogeneity of thermogenic adipose tissue. Nat Metab 2021; 3:751-761. [PMID: 34158657 DOI: 10.1038/s42255-021-00417-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 05/19/2021] [Indexed: 12/13/2022]
Abstract
The perception of adipose tissue, both in the scientific community and in the general population, has changed dramatically in the past 20 years. While adipose tissue was thought for a long time to be a rather simple lipid storage entity, it is now recognized as a highly heterogeneous organ and a critical regulator of systemic metabolism, composed of many different subtypes of cells, with important endocrine functions. Additionally, adipose tissue is nowadays recognized to contribute to energy turnover, due to the presence of specialized thermogenic adipocytes, which can be found in many adipose depots. This review discusses the unprecedented insights that we have gained into the heterogeneity of thermogenic adipocytes and their respective precursors due to the technical developments in single-cell and nucleus technologies. These methodological advances have increased our understanding of how adipose tissue catabolic function is influenced by developmental and intercellular communication events.
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Affiliation(s)
- Wenfei Sun
- Institute of Food, Nutrition and Health, ETH Zurich, Schwerzenbach, Switzerland
| | - Salvatore Modica
- Institute of Food, Nutrition and Health, ETH Zurich, Schwerzenbach, Switzerland
| | - Hua Dong
- Institute of Food, Nutrition and Health, ETH Zurich, Schwerzenbach, Switzerland
| | - Christian Wolfrum
- Institute of Food, Nutrition and Health, ETH Zurich, Schwerzenbach, Switzerland.
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11
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Bast-Habersbrunner A, Kiefer C, Weber P, Fromme T, Schießl A, Schwalie PC, Deplancke B, Li Y, Klingenspor M. LncRNA Ctcflos orchestrates transcription and alternative splicing in thermogenic adipogenesis. EMBO Rep 2021; 22:e51289. [PMID: 34056831 PMCID: PMC8256291 DOI: 10.15252/embr.202051289] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 04/21/2021] [Accepted: 04/22/2021] [Indexed: 12/12/2022] Open
Abstract
The recruitment of thermogenic brite adipocytes within white adipose tissue attenuates obesity and metabolic comorbidities, arousing interest in understanding the underlying regulatory mechanisms. The molecular network of brite adipogenesis, however, remains largely unresolved. In this light, long noncoding RNAs (lncRNAs) emerged as a versatile class of modulators that control many steps within the differentiation machinery. Leveraging the naturally varying propensities of different inbred mouse strains for white adipose tissue browning, we identify the nuclear lncRNA Ctcflos as a pivotal orchestrator of thermogenic gene expression during brite adipocyte differentiation. Mechanistically, Ctcflos acts as a pleiotropic regulator, being essential for the transcriptional recruitment of the early core thermogenic regulatory program and the modulation of alternative splicing to drive brite adipogenesis. This is showcased by Ctcflos‐regulated gene transcription and splicing of the key browning factor Prdm16 toward the isoform that is specific for the thermogenic gene program. Conclusively, our findings emphasize the mechanistic versatility of lncRNAs acting at several independent levels of gene expression for effective regulation of key differentiation factors to direct cell fate and function.
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Affiliation(s)
- Andrea Bast-Habersbrunner
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany.,EKFZ - Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Christoph Kiefer
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Peter Weber
- Research Unit Radiation Cytogenetics, Helmholtz Center Munich Research Center for Environmental Health (GmbH), Neuherberg, Germany
| | - Tobias Fromme
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Anna Schießl
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Petra C Schwalie
- School of Life Sciences, EPFL and Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Bart Deplancke
- School of Life Sciences, EPFL and Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Yongguo Li
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany.,EKFZ - Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Martin Klingenspor
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany.,EKFZ - Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
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12
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Roth CL, Molica F, Kwak BR. Browning of White Adipose Tissue as a Therapeutic Tool in the Fight against Atherosclerosis. Metabolites 2021; 11:319. [PMID: 34069148 PMCID: PMC8156962 DOI: 10.3390/metabo11050319] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/05/2021] [Accepted: 05/13/2021] [Indexed: 02/07/2023] Open
Abstract
Despite continuous medical advances, atherosclerosis remains the prime cause of mortality worldwide. Emerging findings on brown and beige adipocytes highlighted that these fat cells share the specific ability of non-shivering thermogenesis due to the expression of uncoupling protein 1. Brown fat is established during embryogenesis, and beige cells emerge from white adipose tissue exposed to specific stimuli like cold exposure into a process called browning. The consecutive energy expenditure of both thermogenic adipose tissues has shown therapeutic potential in metabolic disorders like obesity and diabetes. The latest data suggest promising effects on atherosclerosis development as well. Upon cold exposure, mice and humans have a physiological increase in brown adipose tissue activation and browning of white adipocytes is promoted. The use of drugs like β3-adrenergic agonists in murine models induces similar effects. With respect to atheroprotection, thermogenic adipose tissue activation has beneficial outcomes in mice by decreasing plasma triglycerides, total cholesterol and low-density lipoproteins, by increasing high-density lipoproteins, and by inducing secretion of atheroprotective adipokines. Atheroprotective effects involve an unaffected hepatic clearance. Latest clinical data tend to find thinner atherosclerotic lesions in patients with higher brown adipose tissue activity. Strategies for preserving healthy arteries are a major concern for public health.
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Affiliation(s)
| | - Filippo Molica
- Department of Pathology and Immunology, University of Geneva, CH-1211 Geneva, Switzerland; (C.L.R.); (B.R.K.)
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13
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Evaluation of Browning Agents on the White Adipogenesis of Bone Marrow Mesenchymal Stromal Cells: A Contribution to Fighting Obesity. Cells 2021; 10:cells10020403. [PMID: 33669222 PMCID: PMC7919793 DOI: 10.3390/cells10020403] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 01/28/2021] [Accepted: 02/10/2021] [Indexed: 01/19/2023] Open
Abstract
Brown-like adipocytes can be induced in white fat depots by a different environmental or drug stimuli, known as "browning" or "beiging". These brite adipocytes express thermogenin UCP1 protein and show different metabolic advantages, such as the ability to acquire a thermogenic phenotype corresponding to standard brown adipocytes that counteracts obesity. In this research, we evaluated the effects of several browning agents during white adipocyte differentiation of bone marrow-derived mesenchymal stromal cells (MSCs). Our in vitro findings identified two compounds that may warrant further in vivo investigation as possible anti-obesity drugs. We found that rosiglitazone and sildenafil are the most promising drug candidates for a browning treatment of obesity. These drugs are already available on the market for treating diabetes and erectile dysfunction, respectively. Thus, their off-label use may be contemplated, but it must be emphasized that some severe side effects are associated with use of these drugs.
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14
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Thermogenic adipocytes: lineage, function and therapeutic potential. Biochem J 2020; 477:2071-2093. [PMID: 32539124 PMCID: PMC7293110 DOI: 10.1042/bcj20200298] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 05/13/2020] [Accepted: 05/15/2020] [Indexed: 12/12/2022]
Abstract
Metabolic inflexibility, defined as the inability to respond or adapt to metabolic demand, is now recognised as a driving factor behind many pathologies associated with obesity and the metabolic syndrome. Adipose tissue plays a pivotal role in the ability of an organism to sense, adapt to and counteract environmental changes. It provides a buffer in times of nutrient excess, a fuel reserve during starvation and the ability to resist cold-stress through non-shivering thermogenesis. Recent advances in single-cell RNA sequencing combined with lineage tracing, transcriptomic and proteomic analyses have identified novel adipocyte progenitors that give rise to specialised adipocytes with diverse functions, some of which have the potential to be exploited therapeutically. This review will highlight the common and distinct functions of well-known adipocyte populations with respect to their lineage and plasticity, as well as introducing the most recent members of the adipocyte family and their roles in whole organism energy homeostasis. Finally, this article will outline some of the more preliminary findings from large data sets generated by single-cell transcriptomics of mouse and human adipose tissue and their implications for the field, both for discovery and for therapy.
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15
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Ruan HB. Developmental and functional heterogeneity of thermogenic adipose tissue. J Mol Cell Biol 2020; 12:775-784. [PMID: 32569352 PMCID: PMC7816678 DOI: 10.1093/jmcb/mjaa029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 05/11/2020] [Accepted: 06/12/2020] [Indexed: 12/18/2022] Open
Abstract
The obesity epidemic continues to rise as a global health challenge. Thermogenic brown and beige adipocytes dissipate chemical energy as heat, providing an opportunity for developing new therapeutics for obesity and related metabolic diseases. Anatomically, brown adipose tissue is distributed as discrete depots, while beige adipocytes exist within certain depots of white adipose tissue. Developmentally, brown and beige adipocytes arise from multiple embryonic progenitor populations that are distinct and overlapping. Functionally, they respond to a plethora of stimuli to engage uncoupling protein 1-dependent and independent thermogenic programs, thus improving systemic glucose homeostasis, lipid metabolism, and the clearance of branched-chain amino acids. In this review, we highlight recent advances in our understanding of the molecular and cellular mechanisms that contribute to the developmental and functional heterogeneity of thermogenic adipose tissue.
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Affiliation(s)
- Hai-Bin Ruan
- Department of Integrative Biology and Physiology, University of Minnesota Medical School, Minneapolis, MN 55455, USA
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16
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Li Y, Schwalie PC, Bast-Habersbrunner A, Mocek S, Russeil J, Fromme T, Deplancke B, Klingenspor M. Systems-Genetics-Based Inference of a Core Regulatory Network Underlying White Fat Browning. Cell Rep 2020; 29:4099-4113.e5. [PMID: 31851936 DOI: 10.1016/j.celrep.2019.11.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 10/02/2019] [Accepted: 11/13/2019] [Indexed: 02/06/2023] Open
Abstract
Recruitment of brite/beige cells, known as browning of white adipose tissue (WAT), is an efficient way to turn an energy-storing organ into an energy-dissipating one and may therefore be of therapeutic value in combating obesity. However, a comprehensive understanding of the regulatory mechanisms mediating WAT browning is still lacking. Here, we exploit the large natural variation in WAT browning propensity between inbred mouse strains to gain an inclusive view of the core regulatory network coordinating this cellular process. Combining comparative transcriptomics, perturbation-based validations, and gene network analyses, we present a comprehensive gene regulatory network of inguinal WAT browning, revealing up to four distinct regulatory modules with key roles for uncovered transcriptional factors, while also providing deep insights into the genetic architecture of brite adipogenesis. The presented findings therefore greatly increase our understanding of the molecular drivers mediating the intriguing cellular heterogeneity and plasticity of adipose tissue.
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Affiliation(s)
- Yongguo Li
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany; EKFZ-Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany
| | - Petra C Schwalie
- Institute of Bio-engineering, School of Life Sciences, EPFL and Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Andrea Bast-Habersbrunner
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany; EKFZ-Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany
| | - Sabine Mocek
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany; EKFZ-Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany
| | - Julie Russeil
- Institute of Bio-engineering, School of Life Sciences, EPFL and Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Tobias Fromme
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany; EKFZ-Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany
| | - Bart Deplancke
- Institute of Bio-engineering, School of Life Sciences, EPFL and Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland.
| | - Martin Klingenspor
- Chair for Molecular Nutritional Medicine, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany; EKFZ-Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Gregor-Mendel-Str. 2, 85354 Freising, Germany.
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17
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Zhang J, Yang J, Yang N, Ma J, Lu D, Dong Y, Liang H, Liu D, Cang M. Dlgap1 negatively regulates browning of white fat cells through effects on cell proliferation and apoptosis. Lipids Health Dis 2020; 19:39. [PMID: 32169116 PMCID: PMC7068870 DOI: 10.1186/s12944-020-01230-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 03/09/2020] [Indexed: 01/21/2023] Open
Abstract
Background Obesity is a metabolic imbalance characterized by excessive deposition of white fat. The browning of white fat can effectively treat obesity and related diseases. Although Dlgap1 (Discs, Large (Drosophila) Homolog-Associated Protein 1) is suspected to have an effect on this process, no empirical evidence is available. Methods To understand the role of Dlgap1, we cultured white and brown fat cells, then performed overexpression and knockout experiments. Results We found that Dlgap1 overexpression in brown adipocytes inhibits brown-fat-related gene expression, promotes white-fat-related genes, while also increasing brown-adipocyte proliferation and apoptosis. However, the gene overexpression has no effect on brown adipocyte maturation. Knocking out Dlgap1 in white fat cells promotes the expression and inhibition of brown-fat-related and white-fat-related genes, respectively. Additionally, the knockout inhibits white fat cell proliferation and apoptosis, while also promoting their maturation. Conclusions Dlgap1 negatively regulates the browning of white adipocytes by influencing cell proliferation and apoptosis.
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Affiliation(s)
- Ju Zhang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China.,College of Life Science, Inner Mongolia University, Hohhot, 010070, China
| | - Jie Yang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China.,College of Life Science, Inner Mongolia University, Hohhot, 010070, China
| | - Nan Yang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China.,College of Life Science, Inner Mongolia University, Hohhot, 010070, China
| | - Jianfei Ma
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China.,College of Life Science, Inner Mongolia University, Hohhot, 010070, China
| | - Datong Lu
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China.,College of Life Science, Inner Mongolia University, Hohhot, 010070, China
| | - Yanhua Dong
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China.,College of Life Science, Inner Mongolia University, Hohhot, 010070, China
| | - Hao Liang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China.,College of Life Science, Inner Mongolia University, Hohhot, 010070, China
| | - Dongjun Liu
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China.,College of Life Science, Inner Mongolia University, Hohhot, 010070, China
| | - Ming Cang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, Inner Mongolia University, Hohhot, 010070, China. .,College of Life Science, Inner Mongolia University, Hohhot, 010070, China.
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18
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Lu M, He Y, Gong M, Li Q, Tang Q, Wang X, Wang Y, Yuan M, Yu Z, Xu B. Role of Neuro-Immune Cross-Talk in the Anti-obesity Effect of Electro-Acupuncture. Front Neurosci 2020; 14:151. [PMID: 32180699 PMCID: PMC7059539 DOI: 10.3389/fnins.2020.00151] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 02/10/2020] [Indexed: 12/14/2022] Open
Abstract
There is evidence to show that electro-acupuncture (EA) has a promotive effect on both lipolysis and thermogenesis, and that these mechanisms underlie the anti-obesity effect of EA. The sympathetic nervous system (SNS) is known to play a role in thermogenesis. Additionally, obesity is characterized by a chronic low-grade inflammatory state. Based on these findings, the aim of the present study is to investigate the potential neuro-immune mechanisms underlying the therapeutic effect of EA in obesity. In the experiment, we used a high fat diet (HFD) rats model to study the effect of EA in reducing body weight. EA increases the activity of sympathetic nerves in inguinal white adipose tissue (iWAT), especially in the HFD group. Compared to HFD rats, EA can decrease sympathetic associated macrophage (SAM) and the level of norepinephrine transporter protein (Slc6a2). The relative uncoupling protein 1 expression shows EA increases thermogenesis in iWAT, and increases β3 receptors. Interestingly, injecting β antagonist in iWAT increases Slc6a2 protein levels. Additionally, the SNS-macrophage cross-talk response to EA showed in iWAT but not in epididymis white adipose tissue. The results of the present study indicate that EA exerts its anti-obesity effect via three mechanisms: (1) inhibition of SAMs and the norepinephrine transporter protein SlC6a2, (2) promoting SNS activity and thermogenesis, and (3) regulating immunologic balance.
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Affiliation(s)
- Mengjiang Lu
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yan He
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
| | - Meirong Gong
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
| | - Qian Li
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
| | - Qianqian Tang
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
| | - Xuan Wang
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yaling Wang
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
| | - Mengqian Yuan
- The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Zhi Yu
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
| | - Bin Xu
- Key Laboratory of Acupuncture and Medicine Research of Ministry of Education, Nanjing University of Chinese Medicine, Nanjing, China
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19
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Lu H, Ye Z, Zhai Y, Wang L, Liu Y, Wang J, Zhang W, Luo W, Lu Z, Chen J. QKI regulates adipose tissue metabolism by acting as a brake on thermogenesis and promoting obesity. EMBO Rep 2020; 21:e47929. [PMID: 31868295 PMCID: PMC6944952 DOI: 10.15252/embr.201947929] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 10/22/2019] [Accepted: 11/08/2019] [Indexed: 12/31/2022] Open
Abstract
Adipose tissue controls numerous physiological processes, and its dysfunction has a causative role in the development of systemic metabolic disorders. The role of posttranscriptional regulation in adipose metabolism has yet to be fully understood. Here, we show that the RNA-binding protein quaking (QKI) plays an important role in controlling metabolic homeostasis of the adipose tissue. QKI-deficient mice are resistant to high-fat-diet (HFD)-induced obesity. Additionally, QKI depletion increased brown fat energy dissipation and browning of subcutaneous white fat. Adipose tissue-specific depletion of QKI in mice enhances cold-induced thermogenesis, thereby preventing hypothermia in response to cold stimulus. Further mechanistic analysis reveals that QKI is transcriptionally induced by the cAMP-cAMP response element-binding protein (CREB) axis and restricts adipose tissue energy consumption by decreasing stability, nuclear export, and translation of mRNAs encoding UCP1 and PGC1α. These findings extend our knowledge of the significance of posttranscriptional regulation in adipose metabolic homeostasis and provide a potential therapeutic target to defend against obesity and its related metabolic diseases.
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Affiliation(s)
- Huanyu Lu
- Department of Occupational and Environmental Healththe Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational EnvironmentSchool of Public HealthFourth Military Medical UniversityXi'anChina
| | - Zichen Ye
- State Key Laboratory of Cancer BiologyDepartment of PharmacogenomicsSchool of PharmacyFourth Military Medical UniversityXi'anChina
| | - Yue Zhai
- Department of Cell BiologyFourth Military Medical UniversityXi'anChina
| | - Li Wang
- State Key Laboratory of Cancer BiologyDepartment of PharmacogenomicsSchool of PharmacyFourth Military Medical UniversityXi'anChina
| | - Ying Liu
- Department of Occupational and Environmental Healththe Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational EnvironmentSchool of Public HealthFourth Military Medical UniversityXi'anChina
| | - Jiye Wang
- Department of Occupational and Environmental Healththe Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational EnvironmentSchool of Public HealthFourth Military Medical UniversityXi'anChina
| | - Wenbin Zhang
- Department of Occupational and Environmental Healththe Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational EnvironmentSchool of Public HealthFourth Military Medical UniversityXi'anChina
| | - Wenjing Luo
- Department of Occupational and Environmental Healththe Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational EnvironmentSchool of Public HealthFourth Military Medical UniversityXi'anChina
| | - Zifan Lu
- State Key Laboratory of Cancer BiologyDepartment of PharmacogenomicsSchool of PharmacyFourth Military Medical UniversityXi'anChina
| | - Jingyuan Chen
- Department of Occupational and Environmental Healththe Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational EnvironmentSchool of Public HealthFourth Military Medical UniversityXi'anChina
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20
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Leiva M, Matesanz N, Pulgarín-Alfaro M, Nikolic I, Sabio G. Uncovering the Role of p38 Family Members in Adipose Tissue Physiology. Front Endocrinol (Lausanne) 2020; 11:572089. [PMID: 33424765 PMCID: PMC7786386 DOI: 10.3389/fendo.2020.572089] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 11/17/2020] [Indexed: 12/12/2022] Open
Abstract
The complex functions of adipose tissue have been a focus of research interest over the past twenty years. Adipose tissue is not only the main energy storage depot, but also one of the largest endocrine organs in the body and carries out crucial metabolic functions. Moreover, brown and beige adipose depots are major sites of energy expenditure through the activation of adaptive, non-shivering thermogenesis. In recent years, numerous signaling molecules and pathways have emerged as critical regulators of adipose tissue, in both homeostasis and obesity-related disease. Among the best characterized are members of the p38 kinase family. The activity of these kinases has emerged as a key contributor to the biology of the white and brown adipose tissues, and their modulation could provide new therapeutic approaches against obesity. Here, we give an overview of the roles of the distinct p38 family members in adipose tissue, focusing on their actions in adipogenesis, thermogenic activity, and secretory function.
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21
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Thibonnier M, Esau C. Metabolic Benefits of MicroRNA-22 Inhibition. Nucleic Acid Ther 2019; 30:104-116. [PMID: 31873061 DOI: 10.1089/nat.2019.0820] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Diabesity is a growing pandemic with substantial health and financial consequences. We are developing microRNA (miRNA)-based drug candidates that transform fat storing adipocytes into fat burning adipocytes (browning effect) to treat metabolic diseases characterized by lipotoxicity. Through phenotypic screening in primary cultures of human subcutaneous adipocytes, we discovered that inhibition of miRNA-22-3p by several complementary antagomirs resulted in increased lipid oxidation, mitochondrial activity, and energy expenditure (EE). These effects may be mediated through activation of target genes like KDM3A, KDM6B, PPARA, PPARGC1B, and SIRT1 involved in lipid catabolism, thermogenesis, and glucose homeostasis. In the model of Diet-Induced Obesity in mice of various ages, weekly subcutaneous injections of various miRNA-22-3p antagomirs produced a significant fat mass reduction, but no change of appetite or body temperature. Insulin sensitivity, as well as circulating glucose and cholesterol levels, was also improved. These original findings suggest that miRNA-22-3p inhibition could become a potent treatment of human obesity and type 2 diabetes mellitus, the so-called diabesity characterized by lipotoxicity and insulin resistance.
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22
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González-García I, Milbank E, Martinez-Ordoñez A, Diéguez C, López M, Contreras C. HYPOTHesizing about central comBAT against obesity. J Physiol Biochem 2019; 76:193-211. [PMID: 31845114 DOI: 10.1007/s13105-019-00719-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 12/02/2019] [Indexed: 12/12/2022]
Abstract
The hypothalamus is a brain region in charge of many vital functions. Among them, BAT thermogenesis represents an essential physiological function to maintain body temperature. In the metabolic context, it has now been established that energy expenditure attributed to BAT function can contribute to the energy balance in a substantial extent. Thus, therapeutic interest in this regard has increased in the last years and some studies have shown that BAT function in humans can make a real contribution to improve diabetes and obesity-associated diseases. Nevertheless, how the hypothalamus controls BAT activity is still not fully understood. Despite the fact that much has been known about the mechanisms that regulate BAT activity in recent years, and that the central regulation of thermogenesis offers a very promising target, many questions remain still unsolved. Among them, the possible human application of knowledge obtained from rodent studies, and drug administration strategies able to specifically target the hypothalamus. Here, we review the current knowledge of homeostatic regulation of BAT, including the molecular insights of brown adipocytes, its central control, and its implication in the development of obesity.
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Affiliation(s)
- Ismael González-García
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany.
| | - Edward Milbank
- CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain.,CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Santiago de Compostela, Spain
| | - Anxo Martinez-Ordoñez
- CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain
| | - Carlos Diéguez
- CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain.,CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Santiago de Compostela, Spain
| | - Miguel López
- CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain.,CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Santiago de Compostela, Spain
| | - Cristina Contreras
- Department of Physiology, Pharmacy School, Complutense University of Madrid, 28040, Madrid, Spain.
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Son M, Oh S, Lee HS, Chung DM, Jang JT, Jeon YJ, Choi CH, Park KY, Son KH, Byun K. Ecklonia Cava Extract Attenuates Endothelial Cell Dysfunction by Modulation of Inflammation and Brown Adipocyte Function in Perivascular Fat Tissue. Nutrients 2019; 11:E2795. [PMID: 31731817 PMCID: PMC6893767 DOI: 10.3390/nu11112795] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 12/19/2022] Open
Abstract
It is well known that perivascular fat tissue (PVAT) dysfunction can induce endothelial cell (EC) dysfunction, an event which is related with various cardiovascular diseases. In this study, we evaluated whether Ecklonia cava extract (ECE) and pyrogallol-phloroglucinol-6,6-bieckol (PPB), one component of ECE, could attenuate EC dysfunction by modulating diet-induced PVAT dysfunction mediated by inflammation and ER stress. A high fat diet (HFD) led to an increase in the number and size of white adipocytes in PVAT; PPB and ECE attenuated those increases. Additionally, ECE and PPB attenuated: (i) an increase in the number of M1 macrophages and the expression level of monocyte chemoattractant protein-1 (MCP-1), both of which are related to increases in macrophage infiltration and induction of inflammation in PVAT, and (ii) the expression of pro-inflammatory cytokines (e.g., tumor necrosis factor-α (TNF-α) and interleukin (IL)-6, chemerin) in PVAT which led to vasoconstriction. Furthermore, ECE and PPB: (i) enhanced the expression of adiponectin and IL-10 which had anti-inflammatory and vasodilator effects, (ii) decreased HFD-induced endoplasmic reticulum (ER) stress and (iii) attenuated the ER stress mediated reduction in sirtuin type 1 (Sirt1) and peroxisome proliferator-activated receptor γ (PPARγ) expression. Protective effects against decreased Sirt1 and PPARγ expression led to the restoration of uncoupling protein -1 (UCP-1) expression and the browning process in PVAT. PPB or ECE attenuated endothelial dysfunction by enhancing the pAMPK-PI3K-peNOS pathway and reducing the expression of endothelin-1 (ET-1). In conclusion, PPB and ECE attenuated PVAT dysfunction and subsequent endothelial dysfunction by: (i) decreasing inflammation and ER stress, and (ii) modulating brown adipocyte function.
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Affiliation(s)
- Myeongjoo Son
- Department of Anatomy & Cell Biology, Gachon University College of Medicine, Incheon 21936, Korea;
- Functional Cellular Networks Laboratory, College of Medicine, Department of Medicine, Graduate School and Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 21999, Korea; (S.O.); (H.S.L.)
| | - Seyeon Oh
- Functional Cellular Networks Laboratory, College of Medicine, Department of Medicine, Graduate School and Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 21999, Korea; (S.O.); (H.S.L.)
| | - Hye Sun Lee
- Functional Cellular Networks Laboratory, College of Medicine, Department of Medicine, Graduate School and Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 21999, Korea; (S.O.); (H.S.L.)
| | - Dong-Min Chung
- Shinwoo cooperation. Ltd. 991, Worasan-ro, Munsan-eup, Jinju, Gyeongsangnam-do 52839, Korea;
| | - Ji Tae Jang
- Aqua Green Technology Co., Ltd., Smart Bldg., Jeju Science Park, Cheomdan-ro, Jeju 63309, Korea;
| | - You-Jin Jeon
- Department of Marine Life Science, Jeju National University, Jeju 63243, Korea;
| | - Chang Hu Choi
- Department of Thoracic and Cardiovascular Surgery, Gachon University Gil Medical Center, Gachon University, Incheon 21565, Korea; (C.H.C.); (K.Y.P.)
| | - Kook Yang Park
- Department of Thoracic and Cardiovascular Surgery, Gachon University Gil Medical Center, Gachon University, Incheon 21565, Korea; (C.H.C.); (K.Y.P.)
| | - Kuk Hui Son
- Department of Thoracic and Cardiovascular Surgery, Gachon University Gil Medical Center, Gachon University, Incheon 21565, Korea; (C.H.C.); (K.Y.P.)
| | - Kyunghee Byun
- Department of Anatomy & Cell Biology, Gachon University College of Medicine, Incheon 21936, Korea;
- Functional Cellular Networks Laboratory, College of Medicine, Department of Medicine, Graduate School and Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 21999, Korea; (S.O.); (H.S.L.)
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Wang S, Pan MH, Hung WL, Tung YC, Ho CT. From white to beige adipocytes: therapeutic potential of dietary molecules against obesity and their molecular mechanisms. Food Funct 2019; 10:1263-1279. [PMID: 30735224 DOI: 10.1039/c8fo02154f] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The global incidence of obesity and its complications continue to rise along with a demand for novel therapeutic approaches. In addition to classic brown adipose tissue (BAT), the formation of brown-like adipocytes called beige adipocytes, within white adipose tissue (WAT), has attracted much attention as a therapeutic target due to its inducible features when stimulated, resulting in the dissipation of extra energy as heat. There are various dietary agents that are able to modulate the beige-development process by interacting with critical molecular signaling cascades, leading to the enhancement of thermogenesis. Although challenges still remain regarding the origin of the beige adipocytes, the crosstalk with activation of BAT and induction of the beiging of white fat may provide attractive potential strategies for management of obesity.
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Affiliation(s)
- Siyu Wang
- Department of Food Science, Rutgers University, New Brunswick, NJ 08901, USA.
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25
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Chen SQ, Niu Q, Ju LP, Alimujiang M, Yan H, Bai NN, Xu J, Fang QC, Han JF, Yang Y, Jia WP. Predicted secreted protein analysis reveals synaptogenic function of Clstn3 during WAT browning and BAT activation in mice. Acta Pharmacol Sin 2019; 40:999-1009. [PMID: 30796355 DOI: 10.1038/s41401-019-0211-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Accepted: 01/05/2019] [Indexed: 11/09/2022] Open
Abstract
Promoting white adipose tissue (WAT) browning and enhancing brown adipose tissue (BAT) activity are attractive therapeutic strategies for obesity and its metabolic complications. Targeting sympathetic innervation in WAT and BAT represents a promising therapeutic concept. However, there are few reports on extracellular microenvironment remodeling, especially changes in nerve terminal connections. Identifying the key molecules mediating the neuro-adipose synaptic junctions is a key point. In this study, we used bioinformatics methods to identify the differentially expressed predicted secreted genes (DEPSGs) during WAT browning and BAT activation. These DEPSGs largely reflect changes of cytokines, extracellular matrix remodeling, vascularization, and adipocyte-neuronal cross-talk. We then performed functional enrichment and cellular distribution specificity analyses. The upregulated and downregulated DEPDGs during WAT browning displayed a distinctive biological pattern and cellular distribution. We listed a cluster of adipocyte-enriched DEPSGs, which might participate in the cross-talk between mature adipocytes and other cells; then identified a synaptogenic adhesion molecule, Clstn3, as the top gene expressed enriched in both mature white and brown adipocytes. Using Q-PCR and immunohistochemistry, we found significantly increased Clstn3 expression level during WAT browning and BAT activation in mice subjected to cold exposure (4 °C). We further demonstrated that treatment with isoproterenol significantly increased Clstn3 and UCP1 expression in differentiated white and beige adipocytes in vitro. In conclusion, our study demonstrates that the secretion pattern was somewhat different between WAT browning and BAT activation. We reveal that Clstn3 may be a key gene mediating the neuro-adipose junction formation or remodeling in WAT browning and BAT activation process.
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26
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Hafidi ME, Buelna-Chontal M, Sánchez-Muñoz F, Carbó R. Adipogenesis: A Necessary but Harmful Strategy. Int J Mol Sci 2019; 20:ijms20153657. [PMID: 31357412 PMCID: PMC6696444 DOI: 10.3390/ijms20153657] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 07/16/2019] [Accepted: 07/20/2019] [Indexed: 02/06/2023] Open
Abstract
Obesity is considered to significantly increase the risk of the development of a vast range of metabolic diseases. However, adipogenesis is a complex physiological process, necessary to sequester lipids effectively to avoid lipotoxicity in other tissues, like the liver, heart, muscle, essential for maintaining metabolic homeostasis and has a crucial role as a component of the innate immune system, far beyond than only being an inert mass of energy storage. In pathophysiological conditions, adipogenesis promotes a pro-inflammatory state, angiogenesis and the release of adipokines, which become dangerous to health. It results in a hypoxic state, causing oxidative stress and the synthesis and release of harmful free fatty acids. In this review, we try to explain the mechanisms occurring at the breaking point, at which adipogenesis leads to an uncontrolled lipotoxicity. This review highlights the types of adipose tissue and their functions, their way of storing lipids until a critical point, which is associated with hypoxia, inflammation, insulin resistance as well as lipodystrophy and adipogenesis modulation by Krüppel-like factors and miRNAs.
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Affiliation(s)
- Mohammed El Hafidi
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología "Ignacio Chávez", México City 14080, Mexico
| | - Mabel Buelna-Chontal
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología "Ignacio Chávez", México City 14080, Mexico
| | - Fausto Sánchez-Muñoz
- Departamento de Inmunología, Instituto Nacional de Cardiología "Ignacio Chávez", México City 14080, Mexico
| | - Roxana Carbó
- Departamento de Biomedicina Cardiovascular, Instituto Nacional de Cardiología "Ignacio Chávez", México City 14080, Mexico.
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27
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Chan M, Lim YC, Yang J, Namwanje M, Liu L, Qiang L. Identification of a natural beige adipose depot in mice. J Biol Chem 2019; 294:6751-6761. [PMID: 30824545 DOI: 10.1074/jbc.ra118.006838] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 02/15/2019] [Indexed: 12/23/2022] Open
Abstract
Beige fat is a potential therapeutic target for obesity and other metabolic diseases due to its inducible brown fat-like functions. Inguinal white adipose tissue (iWAT) can undergo robust brown remodeling with appropriate stimuli and is therefore widely considered as a representative beige fat depot. However, adipose tissues residing in different anatomic depots exhibit a broad range of plasticity, raising the possibility that better beige fat depots with greater plasticity may exist. Here we identified and characterized a novel, naturally-existing beige fat depot, thigh adipose tissue (tAT). Unlike classic WATs, tAT maintains beige fat morphology at room temperature, whereas high-fat diet (HFD) feeding or aging promotes the development of typical WAT features, namely unilocular adipocytes. The brown adipocyte gene expression in tAT is consistently higher than in iWAT under cold exposure, HFD feeding, and rosiglitazone treatment conditions. Our molecular profiling by RNA-Seq revealed up-regulation of energy expenditure pathways and repressed inflammation in tAT relative to eWAT and iWAT. Furthermore, we demonstrated that the master fatty acid oxidation regulator peroxisome proliferator-activated receptor α is dispensable for maintaining and activating the beige character of tAT. Therefore, we have identified tAT as a natural beige adipose depot in mice with a unique molecular profile that does not require peroxisome proliferator-activated receptor α.
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Affiliation(s)
- Michelle Chan
- From the Naomi Berrie Diabetes Center, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, New York 10032.,the Department of Biological Sciences, Columbia University, New York, New York 10027
| | - Yen Ching Lim
- the Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore 169857, Singapore, and
| | - Jing Yang
- From the Naomi Berrie Diabetes Center, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, New York 10032.,the Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiao Tong University, Xi'an City, Shaanxi Province, China
| | - Maria Namwanje
- From the Naomi Berrie Diabetes Center, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, New York 10032
| | - Longhua Liu
- From the Naomi Berrie Diabetes Center, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, New York 10032
| | - Li Qiang
- From the Naomi Berrie Diabetes Center, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, New York 10032,
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28
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Yuliana A, Daijo A, Jheng HF, Kwon J, Nomura W, Takahashi H, Ara T, Kawada T, Goto T. Endoplasmic Reticulum Stress Impaired Uncoupling Protein 1 Expression via the Suppression of Peroxisome Proliferator-Activated Receptor γ Binding Activity in Mice Beige Adipocytes. Int J Mol Sci 2019; 20:ijms20020274. [PMID: 30641938 PMCID: PMC6359291 DOI: 10.3390/ijms20020274] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 12/29/2018] [Accepted: 01/08/2019] [Indexed: 12/16/2022] Open
Abstract
Endoplasmic reticulum (ER) homeostasis is critical in maintaining metabolic regulation. Once it is disrupted due to accumulated unfolded proteins, ER homeostasis is restored via activation of the unfolded protein response (UPR); hence, the UPR affects diverse physiological processes. However, how ER stress influences adipocyte functions is not well known. In this study, we investigated the effect of ER stress in thermogenic capacity of mice beige adipocytes. Here, we show that the expression of uncoupling protein 1 (Ucp1) involved in thermoregulation is severely suppressed under ER stress conditions (afflicted by tunicamycin) in inguinal white adipose tissue (IWAT) both in vitro and in vivo. Further investigation showed that extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) were both activated after ER stress stimulation and regulated the mRNA levels of Ucp1 and peroxisome proliferator-activated receptor γ (Pparγ), which is known as a Ucp1 transcriptional activator, in vitro and ex vivo. We also found that Pparγ protein was significantly degraded, reducing its recruitment to the Ucp1 enhancer, thereby downregulating Ucp1 expression. Additionally, only JNK inhibition, but not ERK, rescued the Pparγ protein. These findings provide novel insights into the regulatory effect of ER stress on Ucp1 expression via Pparγ suppression in beige adipocytes.
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Affiliation(s)
- Ana Yuliana
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Asumi Daijo
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Huei-Fen Jheng
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Jungin Kwon
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Wataru Nomura
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
- Research Unit for Physiological Chemistry, the Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto 606-8501, Japan.
| | - Haruya Takahashi
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Takeshi Ara
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Teruo Kawada
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
- Research Unit for Physiological Chemistry, the Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto 606-8501, Japan.
| | - Tsuyoshi Goto
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
- Research Unit for Physiological Chemistry, the Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto 606-8501, Japan.
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29
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He L, Tang M, Xiao T, Liu H, Liu W, Li G, Zhang F, Xiao Y, Zhou Z, Liu F, Hu F. Obesity-Associated miR-199a/214 Cluster Inhibits Adipose Browning via PRDM16-PGC-1α Transcriptional Network. Diabetes 2018; 67:2585-2600. [PMID: 30279164 DOI: 10.2337/db18-0626] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 09/20/2018] [Indexed: 11/13/2022]
Abstract
miRNAs are important regulators of differentiation, development, and function of brown and beige fat cells. In this study, we identify the role of the miR-199a/214 cluster in the regulation of brown and beige adipocyte development and thermogenesis in vitro and in vivo. We show that expression of the miR-199a/214 cluster is dramatically decreased during brown and beige adipocyte differentiation and in response to cold exposure or β-adrenergic receptor activation. The cluster levels are significantly upregulated in the adipose tissues of obese mice and human subjects. Overexpression of the miR-199a/214 cluster suppresses brown adipocyte differentiation and inhibits thermogenic gene expression and mitochondrial respiration, whereas knockdown of the cluster increases thermogenic gene expression and mitochondrial function in beige adipocytes. In addition, inhibition of the miR-199a/214 cluster promotes beiging effects in vivo. We further show that miR-199a/214 suppresses brown adipocyte differentiation and beige fat development by directly targeting PRDM16 and peroxisome PGC-1α, two key transcriptional regulators of adipose browning. Together, these observations reveal that the miR-199a/214 cluster is a key negative regulator of brown and beige fat development and thermogenesis.
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Affiliation(s)
- Linyun He
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Mowei Tang
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Ting Xiao
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Hailan Liu
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Wei Liu
- Minimally Invasive Surgery Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Guangdi Li
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Feng Zhang
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Yalun Xiao
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Zhiguang Zhou
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Feng Liu
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Fang Hu
- Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
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30
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Yuliana A, Jheng HF, Kawarasaki S, Nomura W, Takahashi H, Ara T, Kawada T, Goto T. β-adrenergic Receptor Stimulation Revealed a Novel Regulatory Pathway via Suppressing Histone Deacetylase 3 to Induce Uncoupling Protein 1 Expression in Mice Beige Adipocyte. Int J Mol Sci 2018; 19:ijms19082436. [PMID: 30126161 PMCID: PMC6121552 DOI: 10.3390/ijms19082436] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 08/14/2018] [Accepted: 08/15/2018] [Indexed: 12/21/2022] Open
Abstract
Browning of adipose tissue has been prescribed as a potential way to treat obesity, marked by the upregulation of uncoupling protein 1 (Ucp1). Several reports have suggested that histone deacetylase (HDAC) might regulate Ucp1 by remodelling chromatin structure, although the mechanism remains unclear. Herein, we investigate the effect of β-adrenergic receptor (β-AR) activation on the chromatin state of beige adipocyte. β-AR-stimulated Ucp1 expression via cold (in vivo) and isoproterenol (in vitro) resulted in acetylation of histone activation mark H3K27. H3K27 acetylation was also seen within Ucp1 promoter upon isoproterenol addition, favouring open chromatin for Ucp1 transcriptional activation. This result was found to be associated with the downregulation of class I HDAC mRNA, particularly Hdac3 and Hdac8. Further investigation showed that although HDAC8 activity decreased, Ucp1 expression was not altered when HDAC8 was activated or inhibited. In contrast, HDAC3 mRNA and protein levels were simultaneously downregulated upon isoproterenol addition, resulting in reduced recruitment of HDAC3 to the Ucp1 enhancer region, causing an increased H3K27 acetylation for Ucp1 upregulation. The importance of HDAC3 inhibition was confirmed through the enhanced Ucp1 expression when the cells were treated with HDAC3 inhibitor. This study highlights the novel mechanism of HDAC3-regulated Ucp1 expression during β-AR stimulation.
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Affiliation(s)
- Ana Yuliana
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Huei-Fen Jheng
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Satoko Kawarasaki
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Wataru Nomura
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
- Research Unit for Physiological Chemistry, the Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto 606-8501, Japan.
| | - Haruya Takahashi
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Takeshi Ara
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
| | - Teruo Kawada
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
- Research Unit for Physiological Chemistry, the Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto 606-8501, Japan.
| | - Tsuyoshi Goto
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
- Research Unit for Physiological Chemistry, the Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto 606-8501, Japan.
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31
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Gulyaeva O, Dempersmier J, Sul HS. Genetic and epigenetic control of adipose development. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1864:3-12. [PMID: 29704660 DOI: 10.1016/j.bbalip.2018.04.016] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 01/22/2018] [Accepted: 04/19/2018] [Indexed: 01/14/2023]
Abstract
White adipose tissue (WAT) is the primary energy storage organ and its excess contributes to obesity, while brown adipose tissue (BAT) and inducible thermogenic (beige/brite) adipocytes in WAT dissipate energy via Ucp1 to maintain body temperature. BAT and subcutaneous WAT develop perinatally while visceral WAT forms after birth from precursors expressing distinct markers, such as Myf5, Pref-1, Wt1, and Prx1, depending on the anatomical location. In addition to the embryonic adipose precursors, a pool of endothelial cells or mural cells expressing Pparγ, Pdgfrβ, Sma and Zfp423 may become adipocytes during WAT expansion in adults. Several markers, such as Cd29, Cd34, Sca1, Cd24, Pdgfrα and Pref-1 are detected in adult WAT SVF cells that can be differentiated into adipocytes. However, potential heterogeneity and differences in developmental stage of these cells are not clear. Beige cells form in a depot- and condition-specific manner by de novo differentiation of precursors or by transdifferentiation. Thermogenic gene activation in brown and beige adipocytes relies on common transcriptional machinery that includes Prdm16, Zfp516, Pgc1α and Ebf2. Moreover, through changing the chromatin landscape, histone methyltransferases, such as Mll3/4 and Ehmt1, as well as demethylases, such as Lsd1, play an important role in regulating the thermogenic gene program. With the presence of BAT and beige/brite cells in human adults, increasing thermogenic activity of BAT and BAT-like tissues may help promote energy expenditure to combat obesity.
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Affiliation(s)
- Olga Gulyaeva
- Endocrinology Program, University of California, Berkeley, CA 94720, USA; Department of Nutritional Sciences & Toxicology, University of California, Berkeley, CA 94720, USA
| | - Jon Dempersmier
- Department of Nutritional Sciences & Toxicology, University of California, Berkeley, CA 94720, USA
| | - Hei Sook Sul
- Endocrinology Program, University of California, Berkeley, CA 94720, USA; Department of Nutritional Sciences & Toxicology, University of California, Berkeley, CA 94720, USA.
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32
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Defour M, Dijk W, Ruppert P, Nascimento EBM, Schrauwen P, Kersten S. The Peroxisome Proliferator-Activated Receptor α is dispensable for cold-induced adipose tissue browning in mice. Mol Metab 2018; 10:39-54. [PMID: 29455954 PMCID: PMC5985232 DOI: 10.1016/j.molmet.2018.01.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 01/25/2018] [Accepted: 01/31/2018] [Indexed: 11/23/2022] Open
Abstract
Objective Chronic cold exposure causes white adipose tissue (WAT) to adopt features of brown adipose tissue (BAT), a process known as browning. Previous studies have hinted at a possible role for the transcription factor Peroxisome Proliferator-Activated Receptor alpha (PPARα) in cold-induced browning. Here we aimed to investigate the importance of PPARα in driving transcriptional changes during cold-induced browning in mice. Methods Male wildtype and PPARα−/− mice were housed at thermoneutrality (28 °C) or cold (5 °C) for 10 days. Whole genome expression analysis was performed on inguinal WAT. In addition, other analyses were carried out. Whole genome expression data of livers of wildtype and PPARα−/− mice fasted for 24 h served as positive control for PPARα-dependent gene regulation. Results Cold exposure increased food intake and decreased weight of BAT and WAT to a similar extent in wildtype and PPARα−/− mice. Except for plasma non-esterified fatty acids, none of the cold-induced changes in plasma metabolites were dependent on PPARα genotype. Histological analysis of inguinal WAT showed clear browning upon cold exposure but did not reveal any morphological differences between wildtype and PPARα−/− mice. Transcriptomics analysis of inguinal WAT showed a marked effect of cold on overall gene expression, as revealed by principle component analysis and hierarchical clustering. However, wildtype and PPARα−/− mice clustered together, even after cold exposure, indicating a similar overall gene expression profile in the two genotypes. Pathway analysis revealed that cold upregulated pathways involved in energy usage, oxidative phosphorylation, and fatty acid β-oxidation to a similar extent in wildtype and PPARα−/− mice. Furthermore, cold-mediated induction of genes related to thermogenesis such as Ucp1, Elovl3, Cox7a1, Cox8, and Cidea, as well as many PPAR target genes, was similar in wildtype and PPARα−/− mice. Finally, pharmacological PPARα activation had a minimal effect on expression of cold-induced genes in murine WAT. Conclusion Cold-induced changes in gene expression in inguinal WAT are unaltered in mice lacking PPARα, indicating that PPARα is dispensable for cold-induced browning. Chronic cold markedly induces PPARα expression in inguinal fat. Cold exposure causes transient hypothermia in PPARα−/− mice. Chronic cold-induced changes in gene expression in inguinal fat are unaltered in PPARα−/− mice. Chronic cold does not lead to PPARα activation in liver.
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Affiliation(s)
- Merel Defour
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition and Health, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Wieneke Dijk
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition and Health, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Philip Ruppert
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition and Health, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Emmani B M Nascimento
- Department of Human Biology and Human Movement Sciences, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, PO Box 616, 6200 MD Maastricht, The Netherlands
| | - Patrick Schrauwen
- Department of Human Biology and Human Movement Sciences, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, PO Box 616, 6200 MD Maastricht, The Netherlands
| | - Sander Kersten
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition and Health, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands.
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Abstract
Brite/brown adipose tissue (BAT) is a thermogenic tissue able to dissipate energy via non-shivering thermogenesis. It is naturally activated by cold and has been demonstrated to increase thermogenic capacity, elevate energy expenditure, and to ultimately contribute to fat mass reduction. Thus, it emerges as novel therapeutic concept for pharmacological intervention in obesity and other metabolic disorders. Therefore, the comprehensive understanding of the regulatory network in thermogenic adipocytes is in demand.The surprising findings that (1) all human protein-coding genes make up not more than 2% of our genome, (2) organismal complexity goes well along with the percentage of nonprotein-coding sequences, and that (3) three quarters of our genome are pervasively transcribed, provide evidence that noncoding RNAs (ncRNAs) are not junk, but a significant and even predominant part of our transcriptome representing a treasure chest worth retrieving regulatory determinants in biological processes and diseases.In this chapter, the impact of regulatory small and long ncRNAs (lncRNAs) in particular microRNAs and lncRNAs on BAT formation and metabolic function and their involvement in physiological and pathological conditions has been reviewed.
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Ozdemir AC, Wynn GM, Vester A, Weitzmann MN, Neigh GN, Srinivasan S, Rudd MK. GNB3 overexpression causes obesity and metabolic syndrome. PLoS One 2017; 12:e0188763. [PMID: 29206867 PMCID: PMC5716578 DOI: 10.1371/journal.pone.0188763] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2017] [Accepted: 11/13/2017] [Indexed: 11/19/2022] Open
Abstract
The G-protein beta subunit 3 (GNB3) gene has been implicated in obesity risk; however, the molecular mechanism of GNB3-related disease is unknown. GNB3 duplication is responsible for a syndromic form of childhood obesity, and an activating DNA sequence variant (C825T) in GNB3 is also associated with obesity. To test the hypothesis that GNB3 overexpression causes obesity, we created bacterial artificial chromosome (BAC) transgenic mice that carry an extra copy of the human GNB3 risk allele. Here we show that GNB3-T/+ mice have increased adiposity, but not greater food intake or a defect in satiety. GNB3-T/+ mice have elevated fasting plasma glucose, insulin, and C-peptide, as well as glucose intolerance, indicating type 2 diabetes. Fasting plasma leptin, triglycerides, cholesterol and phospholipids are elevated, suggesting metabolic syndrome. Based on a battery of behavioral tests, GNB3-T/+ mice did not exhibit anxiety- or depressive-like phenotypes. GNB3-T/+ and wild-type animals have similar activity levels and heat production; however, GNB3-T/+ mice exhibit dysregulation of acute thermogenesis. Finally, Ucp1 expression is significantly lower in white adipose tissue (WAT) in GNB3-T/+ mice, suggestive of WAT remodeling that could lead to impaired cellular thermogenesis. Taken together, our study provides the first functional link between GNB3 and obesity, and presents insight into novel pathways that could be applied to combat obesity and type 2 diabetes.
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Affiliation(s)
- Alev Cagla Ozdemir
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, United States of America
| | - Grace M. Wynn
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, United States of America
| | - Aimee Vester
- Department of Environmental Health Sciences, Rollins School of Public Health, Emory University, Atlanta, GA, United States of America
| | - M. Neale Weitzmann
- Division of Endocrinology, Metabolism, and Lipids, Emory University School of Medicine, Atlanta, GA, United States of America
- Atlanta VA Medical Center, Decatur, GA, United States of America
| | - Gretchen N. Neigh
- Department of Physiology, Emory University School of Medicine, Atlanta, GA, United States of America
- Department of Anatomy & Neurobiology, Virginia Commonwealth University, Richmond, VA, United States of America
| | - Shanthi Srinivasan
- Atlanta VA Medical Center, Decatur, GA, United States of America
- Division of Digestive Diseases, Emory University School of Medicine, Atlanta, GA, United States of America
| | - M. Katharine Rudd
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, United States of America
- * E-mail:
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Duan Y, Li F, Wang W, Guo Q, Wen C, Li Y, Yin Y. Interleukin-15 in obesity and metabolic dysfunction: current understanding and future perspectives. Obes Rev 2017; 18:1147-1158. [PMID: 28752527 DOI: 10.1111/obr.12567] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 04/16/2017] [Accepted: 04/28/2017] [Indexed: 12/13/2022]
Abstract
Obesity rises rapidly and is a major health concern for modern people. Importantly, it is a major risk factor in the development of numerous chronic diseases such as type 2 diabetes mellitus (T2DM). Recently, interleukin (IL)-15 has attracted considerable attention as a potential regulator for the prevention and/or treatment of obesity and T2DM. The beneficial effects include increased loss of fat mass and body weight, improved lipid and glucose metabolism, reduced white adipose tissue inflammation, enhanced mitochondrial function, alterations in the composition of muscle fibres and gut bacterial and attenuated endoplasmic reticulum stress. Although these beneficial effects are somewhat controversial, IL-15, exogenously delivered or endogenously produced, may be a promising target in the prevention and treatment of obesity and T2DM.
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Affiliation(s)
- Y Duan
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Changsha, Hunan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - F Li
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Changsha, Hunan, China.,Hunan Co-Innovation Center of Safety Animal Production, CICSAP, Changsha, China
| | - W Wang
- Laboratory of Animal Nutrition and Human Health, School of Biology, Hunan Normal University, Changsha, China
| | - Q Guo
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Changsha, Hunan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - C Wen
- Laboratory of Animal Nutrition and Human Health, School of Biology, Hunan Normal University, Changsha, China
| | - Y Li
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Changsha, Hunan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Y Yin
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Changsha, Hunan, China.,Laboratory of Animal Nutrition and Human Health, School of Biology, Hunan Normal University, Changsha, China
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Kim E, Lim SM, Kim MS, Yoo SH, Kim Y. Phyllodulcin, a Natural Sweetener, Regulates Obesity-Related Metabolic Changes and Fat Browning-Related Genes of Subcutaneous White Adipose Tissue in High-Fat Diet-Induced Obese Mice. Nutrients 2017; 9:nu9101049. [PMID: 28934139 PMCID: PMC5691666 DOI: 10.3390/nu9101049] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 08/25/2017] [Accepted: 09/18/2017] [Indexed: 11/21/2022] Open
Abstract
Phyllodulcin is a natural sweetener found in Hydrangea macrophylla var. thunbergii. This study investigated whether phyllodulcin could improve metabolic abnormalities in high-fat diet (HFD)-induced obese mice. Animals were fed a 60% HFD for 6 weeks to induce obesity, followed by 7 weeks of supplementation with phyllodulcin (20 or 40 mg/kg body weight (b.w.)/day). Stevioside (40 mg/kg b.w./day) was used as a positive control. Phyllodulcin supplementation reduced subcutaneous fat mass, levels of plasma lipids, triglycerides, total cholesterol, and low-density lipoprotein cholesterol and improved the levels of leptin, adiponectin, and fasting blood glucose. In subcutaneous fat tissues, supplementation with stevioside or phyllodulcin significantly decreased mRNA expression of lipogenesis-related genes, including CCAAT/enhancer-binding protein α (C/EBPα), peroxisome proliferator activated receptor γ (PPARγ), and sterol regulatory element-binding protein-1C (SREBP-1c) compared to the high-fat group. Phyllodulcin supplementation significantly increased the expression of fat browning-related genes, including PR domain containing 16 (Prdm16), uncoupling protein 1 (UCP1), and peroxisome proliferator-activated receptor γ coactivator 1-α (PGC-1α), compared to the high-fat group. Hypothalamic brain-derived neurotrophic factor-tropomyosin receptor kinase B (BDNF-TrkB) signaling was upregulated by phyllodulcin supplementation. In conclusion, phyllodulcin is a potential sweetener that could be used to combat obesity by regulating levels of leptin, fat browning-related genes, and hypothalamic BDNF-TrkB signaling.
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Affiliation(s)
- Eunju Kim
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 03760, Korea.
| | - Soo-Min Lim
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 03760, Korea.
| | - Min-Soo Kim
- Department of Food Science and Biotechnology, and Carbohydrate Bioproduct Research Center, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea.
| | - Sang-Ho Yoo
- Department of Food Science and Biotechnology, and Carbohydrate Bioproduct Research Center, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea.
| | - Yuri Kim
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 03760, Korea.
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37
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Kim M, Furuzono T, Yamakuni K, Li Y, Kim YI, Takahashi H, Ohue-Kitano R, Jheng HF, Takahashi N, Kano Y, Yu R, Kishino S, Ogawa J, Uchida K, Yamazaki J, Tominaga M, Kawada T, Goto T. 10-oxo-12( Z)-octadecenoic acid, a linoleic acid metabolite produced by gut lactic acid bacteria, enhances energy metabolism by activation of TRPV1. FASEB J 2017; 31:5036-5048. [PMID: 28754711 DOI: 10.1096/fj.201700151r] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Accepted: 07/17/2017] [Indexed: 11/11/2022]
Abstract
Gut microbiota can regulate the host energy metabolism; however, the underlying mechanisms that could involve gut microbiota-derived compounds remain to be understood. Therefore, in this study, we investigated the effects of KetoA [10-oxo-12(Z)-octadecenoic acid]-a linoleic acid metabolite produced by gut lactic acid bacteria-on whole-body energy metabolism and found that dietary intake of KetoA could enhance energy expenditure in mice, thereby protecting mice from diet-induced obesity. By using Ca2+ imaging and whole-cell patch-clamp methods, KetoA was noted to potently activate transient receptor potential vanilloid 1 (TRPV1) and enhance noradrenalin turnover in adipose tissues. In addition, KetoA up-regulated genes that are related to brown adipocyte functions, including uncoupling protein 1 (UCP1) in white adipose tissue (WAT), which was later diminished in the presence of a β-adrenoreceptor blocker. By using obese and diabetic model KK-Ay mice, we further show that KetoA intake ameliorated obesity-associated metabolic disorders. In the absence of any observed KetoA-induced antiobesity effect or UCP1 up-regulation in TRPV1-deficient mice, we prove that the antiobesity effect of KetoA was caused by TRPV1 activation-mediated browning in WAT. KetoA produced in the gut could therefore be involved in the regulation of host energy metabolism.-Kim, M., Furuzono, T., Yamakuni, K., Li, Y., Kim, Y.-I., Takahashi, H., Ohue-Kitano, R., Jheng, H.-F., Takahashi, N., Kano, Y., Yu, R., Kishino, S., Ogawa, J., Uchida, K., Yamazaki, J., Tominaga, M., Kawada, T., Goto, T. 10-oxo-12(Z)-octadecenoic acid, a linoleic acid metabolite produced by gut lactic acid bacteria, enhances energy metabolism by activation of TRPV1.
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Affiliation(s)
- Minji Kim
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Tomoya Furuzono
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Kanae Yamakuni
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Yongjia Li
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Young-Il Kim
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Haruya Takahashi
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Ryuji Ohue-Kitano
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan.,Research Unit for Physiological Chemistry, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
| | - Huei-Fen Jheng
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Nobuyuki Takahashi
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan.,Research Unit for Physiological Chemistry, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
| | - Yuriko Kano
- Laboratory of Nutrition Chemistry, Faculty of Home Economics, Kobe Women's University, Kobe, Japan
| | - Rina Yu
- Department of Food Science and Nutrition, University of Ulsan, Ulsan, South Korea
| | - Shigenobu Kishino
- Laboratory of Fermentation Physiology and Applied Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Jun Ogawa
- Research Unit for Physiological Chemistry, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan.,Laboratory of Fermentation Physiology and Applied Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Kunitoshi Uchida
- Division of Cell Signaling, Okazaki Institute for Integrative Bioscience, National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Japan.,Department of Physiological Sciences, The Graduate University for Advanced Studies, Hayama, Japan.,Department of Physiological Science and Molecular Biology, Fukuoka Dental College, Fukuoka, Japan
| | - Jun Yamazaki
- Department of Physiological Science and Molecular Biology, Fukuoka Dental College, Fukuoka, Japan
| | - Makoto Tominaga
- Division of Cell Signaling, Okazaki Institute for Integrative Bioscience, National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Japan.,Department of Physiological Sciences, The Graduate University for Advanced Studies, Hayama, Japan
| | - Teruo Kawada
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan.,Research Unit for Physiological Chemistry, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
| | - Tsuyoshi Goto
- Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan; .,Research Unit for Physiological Chemistry, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan
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38
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Xu SS, Ren X, Yang GL, Xie XL, Zhao YX, Zhang M, Shen ZQ, Ren YL, Gao L, Shen M, Kantanen J, Li MH. Genome-wide association analysis identifies the genetic basis of fat deposition in the tails of sheep (Ovis aries). Anim Genet 2017; 48:560-569. [PMID: 28677334 DOI: 10.1111/age.12572] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/25/2017] [Indexed: 12/13/2022]
Abstract
Fat-tailed sheep (Ovis aries) can survive in harsh environments and satisfy human's intake of dietary fat. However, the animals require more feed, which increases the cost of farming. Thus, most farmers currently prefer thin-tailed, short-tailed or docked sheep. To date, the molecular mechanism of the formation of fat tails in sheep has not been completely elucidated. Here, we conducted a genome-wide association study using phenotypes and genotypes (the Ovine Infinium HD SNP BeadChip genotype data) of two breeds of contrasting tail types (78 Small-tailed and 78 Large-tailed Han sheep breeds) to identify functional genes and variants associated with fat deposition. We identified four significantly (rs416433540, rs409848439, rs408118325 and rs402128848) and three approximately associated autosomal SNPs (rs401248376, rs402445895 and rs416201901). Gene annotation indicated that the surrounding genes (CREB1, STEAP4, CTBP1 and RIP140, also known as NRIP1) function in lipid storage or fat cell regulation. Furthermore, through an X-chromosome-wide association analysis, we detected significantly associated SNPs in the OARX: 88-89 Mb region, which could be a strong candidate genomic region for fat deposition in tails of sheep. Our results represent a new genomic resource for sheep genetics and breeding. In addition, the findings provide novel insights into genetic mechanisms of fat deposition in the tail of sheep and other mammals.
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Affiliation(s)
- S-S Xu
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences (CAS), Beijing, 100101, China.,University of Chinese Academy of Sciences (UCAS), Beijing, 100049, China
| | - X Ren
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences (CAS), Beijing, 100101, China.,Annoroad Gene Technology Co. Ltd, Beijing, 100176, China
| | - G-L Yang
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences (CAS), Beijing, 100101, China.,Department of Life Sciences, Shangqiu Normal University, Shangqiu, 476000, China
| | - X-L Xie
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences (CAS), Beijing, 100101, China.,University of Chinese Academy of Sciences (UCAS), Beijing, 100049, China
| | - Y-X Zhao
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences (CAS), Beijing, 100101, China.,University of Chinese Academy of Sciences (UCAS), Beijing, 100049, China
| | - M Zhang
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences (CAS), Beijing, 100101, China.,School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China
| | - Z-Q Shen
- Shandong Binzhou Academy of Animal Science and Veterinary Medicine, Binzhou, 256600, China
| | - Y-L Ren
- Shandong Binzhou Academy of Animal Science and Veterinary Medicine, Binzhou, 256600, China
| | - L Gao
- Institute of Animal Husbandry and Veterinary Medicine, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihezi, 832000, China.,State Key Laboratory of Sheep Genetic Improvement and Healthy Breeding, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihezi, 832000, China
| | - M Shen
- Institute of Animal Husbandry and Veterinary Medicine, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihezi, 832000, China.,State Key Laboratory of Sheep Genetic Improvement and Healthy Breeding, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihezi, 832000, China
| | - J Kantanen
- Green Technology, Natural Resources Institute Finland (Luke), Jokioinen, 31600, Finland.,Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, 70211, Finland
| | - M-H Li
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences (CAS), Beijing, 100101, China
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39
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Kwan HY, Wu J, Su T, Chao XJ, Liu B, Fu X, Chan CL, Lau RHY, Tse AKW, Han QB, Fong WF, Yu ZL. Cinnamon induces browning in subcutaneous adipocytes. Sci Rep 2017; 7:2447. [PMID: 28550279 PMCID: PMC5446408 DOI: 10.1038/s41598-017-02263-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 04/10/2017] [Indexed: 11/24/2022] Open
Abstract
Browning is the process of increasing the number of brite cells, which helps to increase energy expenditure and reduce obesity. Consumption of natural and non-toxic herbal extracts that possess the browning effect is an attractive anti-obesity strategy. In this study, we examined the browning effect of cinnamon extract. We found that cinnamon extract (CE) induced typical brown adipocyte multiocular phenotype in 3T3-L1 adipocytes. The treatment also increased brown adipocytes markers and reduced white adipocytes markers in the 3T3-L1 adipocytes. In ex vivo studies, we found that CE increased brown adipocytes markers in the subcutaneous adipocytes isolated from db/db mice and diet-induced obesity (DIO) mice. However, CE did not significantly affect UCP1 expression in the adipocytes isolated from perinephric adipose tissue and epididymal adipose tissue. β3-adernergic receptor (β3-AR) antagonist reduced the CE-enhanced UCP1 expression, suggesting an involvement of the β3-AR activity. Oral administration of CE significantly increased UCP1 expression in the subcutaneous adipose tissue in vivo and reduced the body weight of the DIO mice. Taken together, our data suggest that CE has a browning effect in subcutaneous adipocytes. Our study suggests a natural non-toxic herbal remedy to reduce obesity.
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Affiliation(s)
- Hiu Yee Kwan
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China. .,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China.
| | - Jiahui Wu
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Tao Su
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Xiao-Juan Chao
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Bin Liu
- Guangzhou Institute of Cardiovascular Disease, Guangzhou Key Laboratory of Cardiovascular Disease, and the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Xiuqiong Fu
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Chi Leung Chan
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Rebecca Hiu Ying Lau
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Anfernee Kai Wing Tse
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Quan Bin Han
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Wang Fun Fong
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Zhi-Ling Yu
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China. .,Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China.
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40
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You L, Zhou Y, Cui X, Wang X, Sun Y, Gao Y, Wang X, Wen J, Xie K, Tang R, Ji C, Guo X. GM13133 is a negative regulator in mouse white adipocytes differentiation and drives the characteristics of brown adipocytes. J Cell Physiol 2017; 233:313-324. [PMID: 28247947 DOI: 10.1002/jcp.25878] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 02/27/2017] [Indexed: 12/26/2022]
Abstract
Obesity is tightly associated with the disturbance of white adipose tissue storing excess energy. Thermogenic adipocytes (brown and beige) exert a critical role of oxidizing nutrients at the high rates through non-shivering thermogenesis. The recruitment of brown characteristics in white adipocytes, termed browning, has been considered as a promising strategy for treating obesity and associated metabolic complications. Recently, long noncoding RNAs play a crucial role in regulating tissue development and participating in disease pathogenesis, yet their effects on the conversion of white into brown-like adipocytes and thermogenic function were not totally understood. Here, we identified a mouse brown adipose specific expressed lncRNA, termed GM13133. Moreover, a considerable amount of GM13133 is expressed in adipocytes and actively modulated by cold, β3 -adrenergic agonist and cAMP stimuli, implying a potential role in the conversion from white to brown adipocytes. Overexpression of GM13133 did not affect the proliferation of mouse white pre-adipocytes, but inhibited white adipocyte differentiation by decreasing lipid accumulation. The forced expression of GM13133 also significantly drove the conversion of white into brown-like adipocytes with the enhanced mitochondrial biogenesis and the induced expression of brown adipocytes specific markers. A global mRNA analysis further indicated the possible regulatory role of cAMP signaling pathway in GM13133 mediated white-to-brown adipocytes conversion. Our results identified a lncRNA-mediated modulation in primary mouse white adipocyte differentiation and indicate the functional significance of GM13133 in promoting browning of white adipocytes and maintenance of thermogenesis, further providing a potential strategy to treating obesity.
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Affiliation(s)
- LiangHui You
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - YaHui Zhou
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China.,Institute of Pediatrics, Nanjing Medical University, Nanjing, 210029, China
| | - XianWei Cui
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - XingYun Wang
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - YaZhou Sun
- Department of Pediatrics, The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, 453003, China
| | - Yao Gao
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - Xing Wang
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - Juan Wen
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - Kaipeng Xie
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - RanRan Tang
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - ChenBo Ji
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China.,Institute of Pediatrics, Nanjing Medical University, Nanjing, 210029, China
| | - XiRong Guo
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China.,Institute of Pediatrics, Nanjing Medical University, Nanjing, 210029, China
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Minaguchi JA, Ogata S, Takahashi N, Hirose T, Ueda H, Takehana K. Remodeling of rat stromal-vascular cells to brite/beige adipocytes by prolyl-hydroxyproline. J Vet Med Sci 2017; 79:547-553. [PMID: 28123139 PMCID: PMC5383175 DOI: 10.1292/jvms.16-0163] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The aim of this study was to determine the effects of prolyl-hydroxyproline (Pro-Hyp) on the proliferation and differentiation of rat stromal-vascular cells
(SVCs) being cultured in a medium with (Pro-Hyp group) or without Pro-Hyp (control group). The results showed that there was no significant difference in
proliferation rate of SVCs, lipid droplet (LD) diameter or intracellular concentration of triglycerides between two groups. However, the diameter range of LDs
in the Pro-Hyp group tended to be smaller than that in the control group. Transmission electron microscopy showed a tendency for increase in the area of
mitochondria and decrease in the number of mitochondria in the Pro-Hyp-treated SVCs. The mRNA expression levels of white adipose tissue differentiation markers
(Cbp, Fabp and Serpina3k) were significantly lower, but those of the brown adipose tissue differentiation
markers (Dio2, Ucp1 and Ucp3) were significantly higher in the Pro-Hyp group than in the control group. Our
results suggested that Pro-Hyp can facilitate SVCs to differentiate into “brite/beige” adipocytes.
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Affiliation(s)
- Jun A Minaguchi
- Laboratory of Microanatomy, School of Veterinary Medicine, Rakuno Gakuen University, 582, Bunkyodai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
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Racimo F, Gokhman D, Fumagalli M, Ko A, Hansen T, Moltke I, Albrechtsen A, Carmel L, Huerta-Sánchez E, Nielsen R. Archaic Adaptive Introgression in TBX15/WARS2. Mol Biol Evol 2017; 34:509-524. [PMID: 28007980 PMCID: PMC5430617 DOI: 10.1093/molbev/msw283] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
A recent study conducted the first genome-wide scan for selection in Inuit from Greenland using single nucleotide polymorphism chip data. Here, we report that selection in the region with the second most extreme signal of positive selection in Greenlandic Inuit favored a deeply divergent haplotype that is closely related to the sequence in the Denisovan genome, and was likely introgressed from an archaic population. The region contains two genes, WARS2 and TBX15, and has previously been associated with adipose tissue differentiation and body-fat distribution in humans. We show that the adaptively introgressed allele has been under selection in a much larger geographic region than just Greenland. Furthermore, it is associated with changes in expression of WARS2 and TBX15 in multiple tissues including the adrenal gland and subcutaneous adipose tissue, and with regional DNA methylation changes in TBX15.
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Affiliation(s)
- Fernando Racimo
- Department of Integrative Biology, University of California Berkeley, Berkeley, CA
| | - David Gokhman
- Department of Genetics, The Alexander Silberman Institute of Life Sciences, Faculty of Science, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem, Israel
| | - Matteo Fumagalli
- Department of Genetics, Evolution, and Environment, University College London, London, United Kingdom
| | - Amy Ko
- Department of Integrative Biology, University of California Berkeley, Berkeley, CA
| | - Torben Hansen
- The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Ida Moltke
- The Bioinformatics Centre, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Anders Albrechtsen
- The Bioinformatics Centre, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Liran Carmel
- Department of Genetics, The Alexander Silberman Institute of Life Sciences, Faculty of Science, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem, Israel
| | | | - Rasmus Nielsen
- Department of Integrative Biology, University of California Berkeley, Berkeley, CA
- Department of Statistics, University of California Berkeley, Berkeley, CA
- Museum of Natural History, University of Copenhagen, Copenhagen, Denmark
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43
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Ziętak M, Chabowska-Kita A, Kozak LP. Brown fat thermogenesis: Stability of developmental programming and transient effects of temperature and gut microbiota in adults. Biochimie 2017; 134:93-98. [DOI: 10.1016/j.biochi.2016.12.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 12/09/2016] [Indexed: 12/23/2022]
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44
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Flouris AD, Dinas PC, Valente A, Andrade CMB, Kawashita NH, Sakellariou P. Exercise-induced effects on UCP1 expression in classical brown adipose tissue: a systematic review. Horm Mol Biol Clin Investig 2017; 31:/j/hmbci.ahead-of-print/hmbci-2016-0048/hmbci-2016-0048.xml. [PMID: 28085671 DOI: 10.1515/hmbci-2016-0048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Accepted: 11/11/2016] [Indexed: 01/17/2023]
Abstract
Understanding the impact of regular exercise training on uncoupling protein 1 (UCP1) activity in classical brown adipose tissue (CBAT) is vital to our knowledge of whole-body thermogenic activity. The purpose of this systematic review was to evaluate the available experimental evidence on the effect of regular exercise training on UCP1 expression in CBAT. We performed a literature search using PubMed (1966-2016), Scopus, and EMBASE (1974-2016). Studies in any language that examined the effect of regular exercise training on UCP1 expression in CBAT, and not white adipose tissue (WAT), were eligible. Reviews, editorials, and conference proceedings were excluded. Nine studies fulfilled the set criteria. Risk of bias was assessed using the Systematic Review Centre for Laboratory Animal Experimentation (SYRCLE) tool. The quality of reporting the results in the included studies was assessed using the 38-item checklist of the Animal Research Reporting of In Vivo Experiments (ARRIVE). Based on the evidence available and a comprehensive analysis of different confounding factors, we conclude that regular exercise training does not represent a major stimulus of UCP1 expression in CBAT. However, regular exercise training may induce adaptive responses to CBAT thermogenic activity in cases where: (i) animals consume a high-fat diet, (ii) exercise is combined with cold exposure, and (iii) animals show endogenously low UCP1 levels. Finally, it is important to note an inconsistency in the results from the analysed studies, which may be attributed to a number of confounding factors, increased risk of bias, as well as low quality of reporting the results.
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45
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Chang YY, Su HM, Chen SH, Hsieh WT, Chyuan JH, Chao PM. Roles of Peroxisome Proliferator-Activated Receptor α in Bitter Melon Seed Oil-Corrected Lipid Disorders and Conversion of α-Eleostearic Acid into Rumenic Acid in C57BL/6J Mice. Nutrients 2016; 8:nu8120805. [PMID: 27973445 PMCID: PMC5188460 DOI: 10.3390/nu8120805] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 11/21/2016] [Accepted: 12/05/2016] [Indexed: 02/06/2023] Open
Abstract
We previously reported that bitter melon seed oil (BMSO) was an effective anti-steatosis and antiobesity agent. Since the major fatty acid α-eleostearic acid (α-ESA) in BMSO is a peroxisome proliferator-activated receptor α (PPARα) activator, the objective was to investigate the role of PPARα in BMSO-modulated lipid disorders and α-ESA metabolism. C57BL/6J wild (WD) and PPARα knockout (KO) mice were fed a high-fat diet containing BMSO (15% soybean oil + 15% BMSO, HB) or not (30% soybean oil, HS) for 5 weeks. The HB diet significantly reduced hepatic triglyceride concentrations and increased acyl-CoA oxidase activity in WD, but not in KO mice. However, regardless of genotype, body fat percentage was lowered along with upregulated protein levels of uncoupling protein 1 (UCP1) and tyrosine hydroxylase, as well as signaling pathway of cAMP-dependent protein kinase and AMP-activated protein kinase in the white adipose tissue of HB-treated groups compared to HS cohorts. In WD-HB and KO-HB groups, white adipose tissue had autophagy, apoptosis, inflammation, and browning characteristics. Without PPARα, in vivo reduction of α-ESA into rumenic acid was slightly but significantly lowered, along with remarkable reduction of hepatic retinol saturase (RetSat) expression. We concluded that BMSO-mediated anti-steatosis depended on PPARα, whereas the anti-adiposity effect was PPARα-independent. In addition, PPARα-dependent enzymes may participate in α-ESA conversion, but only have a minor role.
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Affiliation(s)
- Ya-Yuan Chang
- Department of Nutrition, China Medical University, Taichung 404, Taiwan.
| | - Hui-Min Su
- Graduate Institute of Physiology, National Taiwan University, Taipei 100, Taiwan.
| | - Szu-Han Chen
- Department of Nutrition, China Medical University, Taichung 404, Taiwan.
| | - Wen-Tsong Hsieh
- School of Medicine, China Medical University, Taichung 404, Taiwan.
| | - Jong-Ho Chyuan
- Hualien District Agricultural Research and Extension Station, Hualien 973, Taiwan.
| | - Pei-Min Chao
- Department of Nutrition, China Medical University, Taichung 404, Taiwan.
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46
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Azhar Y, Parmar A, Miller CN, Samuels JS, Rayalam S. Phytochemicals as novel agents for the induction of browning in white adipose tissue. Nutr Metab (Lond) 2016; 13:89. [PMID: 27980598 PMCID: PMC5135798 DOI: 10.1186/s12986-016-0150-6] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 11/29/2016] [Indexed: 12/18/2022] Open
Abstract
Obesity and its associated metabolic syndrome continue to be a health epidemic in westernized societies and is catching up in the developing world. Despite such increases, little headway has been made to reverse adverse weight gain in the global population. Few medical options exist for the treatment of obesity which points to the necessity for exploration of anti-obesity therapies including pharmaceutical and nutraceutical compounds. Defects in brown adipose tissue, a major energy dissipating organ, has been identified in the obese and is hypothesized to contribute to the overall metabolic deficit observed in obesity. Not surprisingly, considerable attention has been placed on the discovery of methods to activate brown adipose tissue. A variety of plant-derived, natural compounds have shown promise to regulate brown adipose tissue activity and enhance the lipolytic and catabolic potential of white adipose tissue. Through activation of the sympathetic nervous system, thyroid hormone signaling, and transcriptional regulation of metabolism, natural compounds such as capsaicin and resveratrol may provide a relatively safe and effective option to upregulate energy expenditure. Through utilizing the energy dissipating potential of such nutraceutical compounds, the possibility exists to provide a therapeutic solution to correct the energy imbalance that underlines obesity.
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Affiliation(s)
- Yusra Azhar
- Department of Pharmaceutical Sciences, School of Pharmacy, Philadelphia College of Osteopathic Medicine- GA Campus, 625 Old Peachtree Rd NW, Suwannee, GA 30024 USA
| | - Ashish Parmar
- Department of Pharmaceutical Sciences, School of Pharmacy, Philadelphia College of Osteopathic Medicine- GA Campus, 625 Old Peachtree Rd NW, Suwannee, GA 30024 USA
| | - Colette N. Miller
- Department of Foods and Nutrition, University of Georgia, Athens, GA USA
| | - Janaiya S. Samuels
- Department of Pharmaceutical Sciences, School of Pharmacy, Philadelphia College of Osteopathic Medicine- GA Campus, 625 Old Peachtree Rd NW, Suwannee, GA 30024 USA
| | - Srujana Rayalam
- Department of Pharmaceutical Sciences, School of Pharmacy, Philadelphia College of Osteopathic Medicine- GA Campus, 625 Old Peachtree Rd NW, Suwannee, GA 30024 USA
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47
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Abstract
Adipose tissue plays a central role in regulating whole-body energy and glucose homeostasis through its subtle functions at both organ and systemic levels. On one hand, adipose tissue stores energy in the form of lipid and controls the lipid mobilization and distribution in the body. On the other hand, adipose tissue acts as an endocrine organ and produces numerous bioactive factors such as adipokines that communicate with other organs and modulate a range of metabolic pathways. Moreover, brown and beige adipose tissue burn lipid by dissipating energy in the form of heat to maintain euthermia, and have been considered as a new way to counteract obesity. Therefore, adipose tissue dysfunction plays a prominent role in the development of obesity and its related disorders such as insulin resistance, cardiovascular disease, diabetes, depression and cancer. In this review, we will summarize the recent findings of adipose tissue in the control of metabolism, focusing on its endocrine and thermogenic function.
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Affiliation(s)
- Liping Luo
- Department of Metabolism and EndocrinologyMetabolic Syndrome Research Center, Key Laboratory of Diabetes Immunology, National Clinical Research Center for Metabolic Diseases, The Second Xiangya Hospital,
Central South University, Changsha, Hunan, China
| | - Meilian Liu
- Department of Metabolism and EndocrinologyMetabolic Syndrome Research Center, Key Laboratory of Diabetes Immunology, National Clinical Research Center for Metabolic Diseases, The Second Xiangya Hospital,
Central South University, Changsha, Hunan, China
- Department of Biochemistry and Molecular BiologyUniversity of New Mexico Health Sciences Center,
Albuquerque, New Mexico, USA
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48
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Nguyen NLT, Barr CL, Ryu V, Cao Q, Xue B, Bartness TJ. Separate and shared sympathetic outflow to white and brown fat coordinately regulates thermoregulation and beige adipocyte recruitment. Am J Physiol Regul Integr Comp Physiol 2016; 312:R132-R145. [PMID: 27881398 DOI: 10.1152/ajpregu.00344.2016] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 10/14/2016] [Accepted: 11/05/2016] [Indexed: 11/22/2022]
Abstract
White adipose tissue (WAT) and brown adipose tissue (BAT) are innervated and regulated by the sympathetic nervous system (SNS). It is not clear, however, whether there are shared or separate central SNS outflows to WAT and BAT that regulate their function. We injected two isogenic strains of pseudorabies virus, a retrograde transneuronal viral tract tracer, with unique fluorescent reporters into interscapular BAT (IBAT) and inguinal WAT (IWAT) of the same Siberian hamsters to define SNS pathways to both. To test the functional importance of SNS coordinated control of BAT and WAT, we exposed hamsters with denervated SNS nerves to IBAT to 4°C for 16-24 h and measured core and fat temperatures and norepinephrine turnover (NETO) and uncoupling protein 1 (UCP1) expression in fat tissues. Overall, there were more SNS neurons innervating IBAT than IWAT across the neuroaxis. However, there was a greater percentage of singly labeled IWAT neurons in midbrain reticular nuclei than singly labeled IBAT neurons. The hindbrain had ~30-40% of doubly labeled neurons while the forebrain had ~25% suggesting shared SNS circuitry to BAT and WAT across the brain. The raphe nucleus, a key region in thermoregulation, had ~40% doubly labeled neurons. Hamsters with IBAT SNS denervation maintained core body temperature during acute cold challenge and had increased beige adipocyte formation in IWAT. They also had increased IWAT NETO, temperature, and UCP1 expression compared with intact hamsters. These data provide strong neuroanatomical and functional evidence of WAT and BAT SNS cross talk for thermoregulation and beige adipocyte formation.
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Affiliation(s)
- Ngoc Ly T Nguyen
- Department of Biology, Georgia State University, Atlanta, Georgia.,Center for Obesity Reversal, Georgia State University, Atlanta, Georgia; and
| | - Candace L Barr
- Neuroscience Institute, Georgia State University, Atlanta, Georgia
| | - Vitaly Ryu
- Department of Biology, Georgia State University, Atlanta, Georgia.,Center for Obesity Reversal, Georgia State University, Atlanta, Georgia; and
| | - Qiang Cao
- Department of Biology, Georgia State University, Atlanta, Georgia.,Center for Obesity Reversal, Georgia State University, Atlanta, Georgia; and
| | - Bingzhong Xue
- Department of Biology, Georgia State University, Atlanta, Georgia; .,Center for Obesity Reversal, Georgia State University, Atlanta, Georgia; and.,Neuroscience Institute, Georgia State University, Atlanta, Georgia
| | - Timothy J Bartness
- Department of Biology, Georgia State University, Atlanta, Georgia.,Center for Obesity Reversal, Georgia State University, Atlanta, Georgia; and.,Neuroscience Institute, Georgia State University, Atlanta, Georgia
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Cui X, Nguyen NLT, Zarebidaki E, Cao Q, Li F, Zha L, Bartness T, Shi H, Xue B. Thermoneutrality decreases thermogenic program and promotes adiposity in high-fat diet-fed mice. Physiol Rep 2016; 4:4/10/e12799. [PMID: 27230905 PMCID: PMC4886167 DOI: 10.14814/phy2.12799] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 04/26/2016] [Indexed: 01/16/2023] Open
Abstract
Brown/beige adipocytes are therapeutic targets to combat obesity due to their abilities to dissipate energy through adaptive thermogenesis. Most studies investigating induction of brown/beige adipocytes were conducted in cold condition (e.g., 4°C); much is unknown about how the thermogenic program of brown/beige adipocytes is regulated in thermoneutral condition (e.g., 30°C), which is within the thermal comfort zone of human dwellings in daily life. Therefore, this study aims to characterize the thermogenic program of brown/beige adipocytes in mice housed under ambient (22°C) versus thermoneutral condition (30°C). Male mice raised at 22°C or 30°C were fed either chow diet or high‐fat (HF) diet for 20 weeks. Despite less food intake, chow‐fed mice housed at 30°C remained the same body weight compared to mice at 22°C. However, these thermoneutrally housed mice displayed a decrease in the expression of thermogenic program in both brown and white fat depots with larger adipocytes. When pair‐fed with chow diet, thermoneutrally housed mice showed an increase in body weight. Moreover, thermoneutrality increased body weight of mice fed with HF diet. This was associated with decreased expression of the thermogenic program in both brown and white fat depots of the thermoneutrally housed mice. The downregulation of the thermogenic program might have resulted from decreased sympathetic drive in the thermoneutrally housed mice evident by decreased expression of tyrosine hydroxylase expression and norepinephrine turnover in both brown and white fat depots. Our data demonstrate that thermoneutrality may negatively regulate the thermogenic program and sympathetic drive, leading to increased adiposity in mice.
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Affiliation(s)
- Xin Cui
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
| | - Ngoc Ly T Nguyen
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
| | - Eleen Zarebidaki
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
| | - Qiang Cao
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
| | - Fenfen Li
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
| | - Lin Zha
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
| | - Timothy Bartness
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
| | - Hang Shi
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
| | - Bingzhong Xue
- Department of Biology and Center for Obesity Reversal, Georgia State University, Atlanta, Georgia
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50
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Shipp SL, Cline MA, Gilbert ER. Recent advances in the understanding of how neuropeptide Y and α-melanocyte stimulating hormone function in adipose physiology. Adipocyte 2016; 5:333-350. [PMID: 27994947 DOI: 10.1080/21623945.2016.1208867] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 06/28/2016] [Accepted: 06/28/2016] [Indexed: 12/20/2022] Open
Abstract
Communication between the brain and the adipose tissue has been the focus of many studies in recent years, with the "brain-fat axis" identified as a system that orchestrates the assimilation and usage of energy to maintain body mass and adequate fat stores. It is now well-known that appetite-regulating peptides that were studied as neurotransmitters in the central nervous system can act both on the hypothalamus to regulate feeding behavior and also on the adipose tissue to modulate the storage of energy. Energy balance is thus partly controlled by factors that can alter both energy intake and storage/expenditure. Two such factors involved in these processes are neuropeptide Y (NPY) and α-melanocyte stimulating hormone (α-MSH). NPY, an orexigenic factor, is associated with promoting adipogenesis in both mammals and chickens, while α-MSH, an anorexigenic factor, stimulates lipolysis in rodents. There is also evidence of interaction between the 2 peptides. This review aims to summarize recent advances in the study of NPY and α-MSH regarding their role in adipose tissue physiology, with an emphasis on the cellular and molecular mechanisms. A greater understanding of the brain-fat axis and regulation of adiposity by bioactive peptides may provide insights on strategies to prevent or treat obesity and also enhance nutrient utilization efficiency in agriculturally-important species.
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