151
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Kojima T, Esaki N, Tsuda T. Combination of Exercise and Intake of Amino Acid Mixture Synergistically Induces Beige Adipocyte Formation in Mice. J Nutr Sci Vitaminol (Tokyo) 2021; 67:225-233. [PMID: 34470997 DOI: 10.3177/jnsv.67.225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Exercise combined with dietary factors may have significant effects on the suppression of body fat accumulation. Several trials suggest that amino acid mixtures containing alanine, arginine, and phenylalanine (ARF) combined with exercise can significantly reduce body fat accumulation in overweight adults and high-fat diet-induced obesity in mice. We therefore hypothesized that combining ARF and exercise would significantly induce beige adipocyte formation and that this would contribute to reducing body weight, whereas administration of ARF or exercise alone would not. Administration of ARF (1 g/kg body weight, daily) combined with exercise (5 sessions per week) for 4 wk significantly induced formation of beige adipocytes in inguinal white adipose tissue (iWAT) in mice, although ARF or exercise alone did not. Metabolomic analysis showed that plasma lactate concentration was significantly elevated in the exercise+ARF group relative to the exercise group. Furthermore, lactate dehydrogenase B, which increases redox stress by converting lactate to pyruvate in iWAT and triggers induction of uncoupling protein 1 expression was significantly upregulated in iWAT of the exercise+ARF group. These findings demonstrate the unique effect of ARF combined with exercise for inducing beige adipocyte formation, which may be associated with the suggested lactate-mediated pathway. Appropriate mixtures of amino acids could be used as a dietary supplement before exercise and contributed to increasing energy expenditures.
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Affiliation(s)
- Takuya Kojima
- College of Bioscience and Biotechnology and Graduate School of Bioscience and Biotechnology, Chubu University
| | - Nana Esaki
- College of Bioscience and Biotechnology and Graduate School of Bioscience and Biotechnology, Chubu University
| | - Takanori Tsuda
- College of Bioscience and Biotechnology and Graduate School of Bioscience and Biotechnology, Chubu University
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152
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Folie S, Radlinger B, Goebel G, Salzmann K, Staudacher G, Ress C, Tilg H, Kaser S. Changing the dietary composition improves inflammation but not adipocyte thermogenesis in diet-induced obese mice. J Nutr Biochem 2021; 99:108837. [PMID: 34419570 DOI: 10.1016/j.jnutbio.2021.108837] [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: 10/27/2020] [Revised: 07/11/2021] [Accepted: 07/14/2021] [Indexed: 10/20/2022]
Abstract
Pronounced weight loss was shown to improve adipocyte dysfunction and insulin sensitivity in obese subjects. While bariatric surgery is frequently accompanied by adverse side effects, weight loss due to caloric restriction is often followed by weight regain. Here we aimed to determine whether switching the diet from a metabolically harmful Western type diet to a balanced standard diet is sufficient to reverse adipocyte dysfunction in diet-induced obese mice. Male C57BL/6 mice were fed a Western diet for 10 weeks and afterwards switched to a standard diet for eight more weeks (WD/SD mice) or continued to be fed a Western diet (WD/WD mice) ad libitum. Mice fed SD for 18 weeks served as control group (SD/SD). Insulin sensitivity was similar in WD/SD and SD/SD mice despite increased body weight in WD/SD mice. Beiging markers Ucp-1, Cidea and Cox8b were drastically reduced in subcutaneous adipose tissue of WD/SD mice when compared with SD/SD mice. Also, in brown adipose tissue morphologic features and markers of thermogenesis were still altered in both WD/SD and WD/WD mice. However, adipocyte size, Hif1α and macrophage infiltration were significantly lower in both, brown and white adipose tissues of WD/SD compared to WD/WD mice and additionally, a shift toward anti-inflammatory M2 phenotype was found in WD/SD mice only. In conclusion our data suggest that switching the diet is sufficient to improve adipose tissue inflammation, while western diet negatively affects thermogenic capacity of brown adipose tissue, and inhibits beiging of white adipose tissue in the long-term.
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Affiliation(s)
- Sabrina Folie
- Department of Internal Medicine I, Medical University Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Metabolic Crosstalk, Medical University Innsbruck, Innsbruck, Austria
| | - Bernhard Radlinger
- Department of Internal Medicine I, Medical University Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Metabolic Crosstalk, Medical University Innsbruck, Innsbruck, Austria
| | - Georg Goebel
- Department of Medical Statistics, Informatics and Health Economics, Medical University Innsbruck, Innsbruck, Austria
| | - Karin Salzmann
- Department of Internal Medicine I, Medical University Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Metabolic Crosstalk, Medical University Innsbruck, Innsbruck, Austria
| | - Gabriele Staudacher
- Department of Internal Medicine I, Medical University Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Metabolic Crosstalk, Medical University Innsbruck, Innsbruck, Austria
| | - Claudia Ress
- Department of Internal Medicine I, Medical University Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Metabolic Crosstalk, Medical University Innsbruck, Innsbruck, Austria
| | - Herbert Tilg
- Department of Internal Medicine I, Medical University Innsbruck, Innsbruck, Austria
| | - Susanne Kaser
- Department of Internal Medicine I, Medical University Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Metabolic Crosstalk, Medical University Innsbruck, Innsbruck, Austria.
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153
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PPARs-Orchestrated Metabolic Homeostasis in the Adipose Tissue. Int J Mol Sci 2021; 22:ijms22168974. [PMID: 34445679 PMCID: PMC8396609 DOI: 10.3390/ijms22168974] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/17/2021] [Accepted: 08/17/2021] [Indexed: 01/12/2023] Open
Abstract
It has been more than three decades since peroxisome proliferator-activated receptors (PPARs) were first discovered. Many investigations have revealed the central regulators of PPARs in lipid and glucose homeostasis in response to different nutrient conditions. PPARs have attracted much attention due to their ability to improve metabolic syndromes, and they have also been proposed as classical drug targets for the treatment of hyperlipidemia and type 2 diabetes (T2D) mellitus. In parallel, adipose tissue is known to play a unique role in the pathogenesis of insulin resistance and metabolic syndromes due to its ability to “safely” store lipids and secrete cytokines that regulate whole-body metabolism. Adipose tissue relies on a complex and subtle network of transcription factors to maintain its normal physiological function, by coordinating various molecular events, among which PPARs play distinctive and indispensable roles in adipocyte differentiation, lipid metabolism, adipokine secretion, and insulin sensitivity. In this review, we discuss the characteristics of PPARs with special emphasis on the roles of the different isotypes in adipocyte biology.
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154
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Zhang W, Sheng T, Gu Z, Zhang Y. Strategies for Browning Agent Delivery. Pharm Res 2021; 38:1327-1334. [PMID: 34398404 DOI: 10.1007/s11095-021-03081-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Accepted: 07/02/2021] [Indexed: 12/31/2022]
Abstract
Obesity expands as a global climbing epidemic that is often correlated to cardiovascular diseases and endocrine disorders. Converting white adipocytes to brown adipocytes for enhanced energy expenditure has recently emerged as a promising anti-obesity treatment. However, the conventional approaches to apply browning agents systematically suffer from off-target effects, multiple dosage requirements, and poor patient compliance. To date, various delivery strategies have been reported to deliver browning agents for obesity treatment in a safer and more controllable manner. This review will discuss the latest designs in browning agent delivery systems with a focus on nanomedicines and transdermal patches.
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Affiliation(s)
- Wentao Zhang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Tao Sheng
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Zhen Gu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China. .,Department of General Surgery, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, 310016, China. .,Zhejiang Laboratory of Systems & Precision Medicine, Zhejiang University Medical Center, Hangzhou, 311121, China. .,MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
| | - Yuqi Zhang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China.
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155
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Guo F, Seldin M, Péterfy M, Charugundla S, Zhou Z, Lee SD, Mouton A, Rajbhandari P, Zhang W, Pellegrini M, Tontonoz P, Lusis AJ, Shih DM. NOTUM promotes thermogenic capacity and protects against diet-induced obesity in male mice. Sci Rep 2021; 11:16409. [PMID: 34385484 PMCID: PMC8361163 DOI: 10.1038/s41598-021-95720-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 07/28/2021] [Indexed: 11/29/2022] Open
Abstract
We recently showed that NOTUM, a liver-secreted Wnt inhibitor, can acutely promote browning of white adipose. We now report studies of chronic overexpression of NOTUM in liver indicating that it protects against diet-induced obesity and improves glucose homeostasis in mice. Adeno-associated virus (AAV) vectors were used to overexpress GFP or mouse Notum in the livers of male C57BL/6J mice and the mice were fed an obesifying diet. After 14 weeks of high fat, high sucrose diet feeding, the AAV-Notum mice exhibited decreased obesity and improved glucose tolerance compared to the AAV-GFP mice. Gene expression and immunoblotting analysis of the inguinal fat and brown fat revealed increased expression of beige/brown adipocyte markers in the AAV-Notum group, suggesting enhanced thermogenic capacity by NOTUM. A β3 adrenergic receptor agonist-stimulated lipolysis test suggested increased lipolysis capacity by NOTUM. The levels of collagen and C–C motif chemokine ligand 2 (CCL2) in the epididymal white adipose tissue of the AAV-Notum mice were significantly reduced, suggesting decreased fibrosis and inflammation, respectively. RNA sequencing analysis of inguinal white adipose of 4-week chow diet-fed mice revealed a highly significant enrichment of extracellular matrix (ECM) functional cluster among the down-regulated genes in the AAV-Notum group, suggesting a potential mechanism contributing to improved glucose homeostasis. Our in vitro studies demonstrated that recombinant human NOTUM protein blocked the inhibitory effects of WNT3A on brown adipocyte differentiation. Furthermore, NOTUM attenuated WNT3A’s effects on upregulation of TGF-β signaling and its downstream targets. Overall, our data suggest that NOTUM modulates adipose tissue function by promoting thermogenic capacity and inhibiting fibrosis through inhibition of Wnt signaling.
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Affiliation(s)
- Fangfei Guo
- Department of Microbiology, Immunology, and Molecular Genetics, Division of Cardiology, Department of Medicine, Department of Human Genetics, University of California, 10833 Le Conte Avenue, A2-237 CHS, Los Angeles, CA, 90095-1679, USA
| | - Marcus Seldin
- Department of Biological Chemistry and Center for Epigenetics and Metabolism, University of California, Irvine, CA, 92697, USA
| | - Miklós Péterfy
- Department of Basic Medical Sciences, Western University of Health Sciences, Pomona, CA, 91766, USA
| | - Sarada Charugundla
- Department of Microbiology, Immunology, and Molecular Genetics, Division of Cardiology, Department of Medicine, Department of Human Genetics, University of California, 10833 Le Conte Avenue, A2-237 CHS, Los Angeles, CA, 90095-1679, USA
| | - Zhiqiang Zhou
- Department of Microbiology, Immunology, and Molecular Genetics, Division of Cardiology, Department of Medicine, Department of Human Genetics, University of California, 10833 Le Conte Avenue, A2-237 CHS, Los Angeles, CA, 90095-1679, USA
| | - Stephen D Lee
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, CA, 90095, USA
| | - Alice Mouton
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, 90095, USA
| | - Prashant Rajbhandari
- Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine Mount Sinai, New York, NY, 10029, USA
| | - Wenchao Zhang
- Department of Microbiology, Immunology, and Molecular Genetics, Division of Cardiology, Department of Medicine, Department of Human Genetics, University of California, 10833 Le Conte Avenue, A2-237 CHS, Los Angeles, CA, 90095-1679, USA.,The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, 250012, Shandong, China.,Department of Critical Care Medicine, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, 250012, Shandong, China
| | - Matteo Pellegrini
- Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA, 90095, USA
| | - Peter Tontonoz
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, CA, 90095, USA
| | - Aldons J Lusis
- Department of Microbiology, Immunology, and Molecular Genetics, Division of Cardiology, Department of Medicine, Department of Human Genetics, University of California, 10833 Le Conte Avenue, A2-237 CHS, Los Angeles, CA, 90095-1679, USA
| | - Diana M Shih
- Department of Microbiology, Immunology, and Molecular Genetics, Division of Cardiology, Department of Medicine, Department of Human Genetics, University of California, 10833 Le Conte Avenue, A2-237 CHS, Los Angeles, CA, 90095-1679, USA.
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156
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Jiang CL, Chen YF, Lin FJ. Apolipoprotein E deficiency activates thermogenesis of white adipose tissues in mice through enhancing β-hydroxybutyrate production from precursor cells. FASEB J 2021; 35:e21760. [PMID: 34309918 DOI: 10.1096/fj.202100298rr] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 06/10/2021] [Accepted: 06/12/2021] [Indexed: 12/24/2022]
Abstract
White adipose tissue (WAT) has the capacity to undergo a white-to-beige phenotypic switch, known as browning, in response to stimuli such as cold. However, the mechanism underlying beige adipocyte formation is largely unknown. Apolipoprotein E (ApoE) is highly induced in WAT and has been implicated in lipid metabolism. Here, we show that ApoE deficiency in mice increased oxygen consumption and thermogenesis and enhanced adipose browning pattern in inguinal WAT (iWAT), with associated characteristics such as increased Ucp1 and Pparγ expression. At the cellular level, ApoE deficient beige adipocytes had increased glucose uptake and higher mitochondrial respiration than wild-type cells. Mechanistically, we showed that ApoE deficient iWAT and primary adipose precursor cells activated the thermogenic genes program by stimulating the production of ketone body β-hydroxybutyrate (βHB), a novel adipose browning promoting factor. This was accompanied by increased expression of genes involved in ketogenesis and could be compromised by the treatment for ketogenesis inhibitors. Consistently, ApoE deficient mice show higher serum βHB level than wild-type mice in the fed state and during cold exposure. Our results further demonstrate that the increased βHB production in ApoE deficient adipose precursor cells could be attributed, at least in part, to enhanced Cd36 expression and CD36-mediated fatty acid utilization. Our findings uncover a previously uncharacterized role for ApoE in energy homeostasis via its cell-autonomous action in WAT.
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Affiliation(s)
- Chung-Lin Jiang
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Ying-Fang Chen
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Fu-Jung Lin
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan.,Research Center for Development Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan
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157
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Lemus-Conejo A, Medrano M, Lopez S, Millan-Linares MC, Rosillo MA, Perez-Simon JA, Muriana FJG, Abia R. MUFAs in High-Fat Diets Protect against Obesity-Induced Bias of Hematopoietic Cell Lineages. Mol Nutr Food Res 2021; 65:e2001203. [PMID: 34132459 DOI: 10.1002/mnfr.202001203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 05/27/2021] [Indexed: 11/08/2022]
Abstract
SCOPE The role of dietary fatty acids in the generation of bone marrow (BM) immune cells and their trafficking to extramedullary compartments in the obesity is not yet fully understood. METHODS AND RESULTS C57BL/6J mice are randomly assigned to isocaloric high-fat diets (HFDs) formulate with dietary fats rich in saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs) or MUFAs fortified with eicosapentaenoic and docosahexaenoic acids for 20 weeks, followed by profiling of the obese metabolic phenotype and immunophenotypic features of immune cells in blood, spleen, and BM. All HFDs induce an obese phenotype, but it becomes largely less disruptive after the HFDs are enriched in MUFAs, which also induce signs of granulopoiesis and an expansion of long-term hematopoietic stem and granulocyte-macrophage progenitor cells in BM. In contrast, a HFD enriched in SFAs disturbs the fitness of medullary lymphocytes and promotes monopoiesis in favor of pro-inflammatory activated subsets. CONCLUSION The reshaping of the fatty acid pools with MUFAs from the diet serves to manipulate the generation and trafficking of immune cells that are biased during obesity. These findings reveal a novel strategy by which dietary MUFAs may be instrumental in combating HFD-induced dysfunctional immune systems.
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Affiliation(s)
- Ana Lemus-Conejo
- Laboratory of Cellular and Molecular Nutrition, Instituto de la Grasa, The Spanish National Research Council (CSIC), Seville, 41013, Spain
| | - Mayte Medrano
- Department of Haematology, Instituto de Biomedicina de Sevilla (IBiS/CSIC/CIBERONC), Hospital Universitario Virgen del Rocio, University of Seville, Seville, 41012, Spain
| | - Sergio Lopez
- Laboratory of Cellular and Molecular Nutrition, Instituto de la Grasa, The Spanish National Research Council (CSIC), Seville, 41013, Spain
- Department of Cell Biology, Faculty of Biology, University of Seville, Seville, 41012, Spain
- Instituto de Biomedicina de Sevilla (IBiS/CSIC), Hospital Universitario Virgen del Rocio, University of Seville, Seville, 41012, Spain
| | | | - Maria A Rosillo
- Laboratory of Cellular and Molecular Nutrition, Instituto de la Grasa, The Spanish National Research Council (CSIC), Seville, 41013, Spain
| | - Jose A Perez-Simon
- Department of Haematology, Instituto de Biomedicina de Sevilla (IBiS/CSIC/CIBERONC), Hospital Universitario Virgen del Rocio, University of Seville, Seville, 41012, Spain
| | - Francisco J G Muriana
- Laboratory of Cellular and Molecular Nutrition, Instituto de la Grasa, The Spanish National Research Council (CSIC), Seville, 41013, Spain
| | - Rocio Abia
- Laboratory of Cellular and Molecular Nutrition, Instituto de la Grasa, The Spanish National Research Council (CSIC), Seville, 41013, Spain
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158
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Giroud M, Tsokanos FF, Caratti G, Kotschi S, Khani S, Jouffe C, Vogl ES, Irmler M, Glantschnig C, Gil-Lozano M, Hass D, Khan AA, Garcia MR, Mattijssen F, Maida A, Tews D, Fischer-Posovszky P, Feuchtinger A, Virtanen KA, Beckers J, Wabitsch M, Uhlenhaut H, Blüher M, Tuckermann J, Scheideler M, Bartelt A, Herzig S. HAND2 is a novel obesity-linked adipogenic transcription factor regulated by glucocorticoid signalling. Diabetologia 2021; 64:1850-1865. [PMID: 34014371 PMCID: PMC8245394 DOI: 10.1007/s00125-021-05470-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Accepted: 02/18/2021] [Indexed: 11/01/2022]
Abstract
AIMS/HYPOTHESIS Adipocytes are critical cornerstones of energy metabolism. While obesity-induced adipocyte dysfunction is associated with insulin resistance and systemic metabolic disturbances, adipogenesis, the formation of new adipocytes and healthy adipose tissue expansion are associated with metabolic benefits. Understanding the molecular mechanisms governing adipogenesis is of great clinical potential to efficiently restore metabolic health in obesity. Here we investigate the role of heart and neural crest derivatives-expressed 2 (HAND2) in adipogenesis. METHODS Human white adipose tissue (WAT) was collected from two cross-sectional studies of 318 and 96 individuals. In vitro, for mechanistic experiments we used primary adipocytes from humans and mice as well as human multipotent adipose-derived stem (hMADS) cells. Gene silencing was performed using siRNA or genetic inactivation in primary adipocytes from loxP and or tamoxifen-inducible Cre-ERT2 mouse models with Cre-encoding mRNA or tamoxifen, respectively. Adipogenesis and adipocyte metabolism were measured by Oil Red O staining, quantitative PCR (qPCR), microarray, glucose uptake assay, western blot and lipolysis assay. A combinatorial RNA sequencing (RNAseq) and ChIP qPCR approach was used to identify target genes regulated by HAND2. In vivo, we created a conditional adipocyte Hand2 deletion mouse model using Cre under control of the Adipoq promoter (Hand2AdipoqCre) and performed a large panel of metabolic tests. RESULTS We found that HAND2 is an obesity-linked white adipocyte transcription factor regulated by glucocorticoids that was necessary but insufficient for adipocyte differentiation in vitro. In a large cohort of humans, WAT HAND2 expression was correlated to BMI. The HAND2 gene was enriched in white adipocytes compared with brown, induced early in differentiation and responded to dexamethasone (DEX), a typical glucocorticoid receptor (GR, encoded by NR3C1) agonist. Silencing of NR3C1 in hMADS cells or deletion of GR in a transgenic conditional mouse model results in diminished HAND2 expression, establishing that adipocyte HAND2 is regulated by glucocorticoids via GR in vitro and in vivo. Furthermore, we identified gene clusters indirectly regulated by the GR-HAND2 pathway. Interestingly, silencing of HAND2 impaired adipocyte differentiation in hMADS and primary mouse adipocytes. However, a conditional adipocyte Hand2 deletion mouse model using Cre under control of the Adipoq promoter did not mirror these effects on adipose tissue differentiation, indicating that HAND2 was required at stages prior to Adipoq expression. CONCLUSIONS/INTERPRETATION In summary, our study identifies HAND2 as a novel obesity-linked adipocyte transcription factor, highlighting new mechanisms of GR-dependent adipogenesis in humans and mice. DATA AVAILABILITY Array data have been submitted to the GEO database at NCBI (GSE148699).
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Affiliation(s)
- Maude Giroud
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximilians-University, Munich, Germany
| | - Foivos-Filippos Tsokanos
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Giorgio Caratti
- Institute for Comparative Molecular Endocrinology, Universität Ulm, Ulm, Germany
| | - Stefan Kotschi
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximilians-University, Munich, Germany
| | - Sajjad Khani
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximilians-University, Munich, Germany
| | - Céline Jouffe
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Elena S Vogl
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Martin Irmler
- Institute of Experimental Genetics, Helmholtz Zentrum München, Neuherberg, Germany
| | - Christina Glantschnig
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Manuel Gil-Lozano
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Daniela Hass
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Asrar Ali Khan
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Marcos Rios Garcia
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Frits Mattijssen
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Adriano Maida
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Daniel Tews
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent Medicine, Ulm University Medical Center, Ulm, Germany
| | - Pamela Fischer-Posovszky
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent Medicine, Ulm University Medical Center, Ulm, Germany
| | - Annette Feuchtinger
- Research Unit Analytical Pathology, Helmholtz Center Munich, Neuherberg, Germany
| | | | - Johannes Beckers
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Institute of Experimental Genetics, Helmholtz Zentrum München, Neuherberg, Germany
- Experimental Genetics, TUM School of Life Sciences, Technische Universität München, Freising, Germany
| | - Martin Wabitsch
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent Medicine, Ulm University Medical Center, Ulm, Germany
| | - Henriette Uhlenhaut
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- Metabolic Programming, TUM School of Life Sciences Weihenstephan and ZIEL Institute for Food & Health, Munich, Germany
| | - Matthias Blüher
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, Leipzig, Germany
| | - Jan Tuckermann
- Institute for Comparative Molecular Endocrinology, Universität Ulm, Ulm, Germany
| | - Marcel Scheideler
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany
| | - Alexander Bartelt
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximilians-University, Munich, Germany.
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany.
- Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
| | - Stephan Herzig
- Institute for Diabetes and Cancer (IDC); Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.
- German Center for Diabetes Research (DZD), Neuherberg, Germany.
- Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine 1, Heidelberg University Hospital, Heidelberg, Germany.
- Molecular Metabolic Control, Medical Faculty, Technical University Munich, Munich, Germany.
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Wang S, Cao Q, Cui X, Jing J, Li F, Shi H, Xue B, Shi H. Dnmt3b Deficiency in Myf5 +-Brown Fat Precursor Cells Promotes Obesity in Female Mice. Biomolecules 2021; 11:1087. [PMID: 34439754 PMCID: PMC8393658 DOI: 10.3390/biom11081087] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/20/2021] [Accepted: 07/21/2021] [Indexed: 11/17/2022] Open
Abstract
Increasing energy expenditure through activation of brown fat thermogenesis is a promising therapeutic strategy for the treatment of obesity. Epigenetic regulation has emerged as a key player in regulating brown fat development and thermogenic program. Here, we aimed to study the role of DNA methyltransferase 3b (Dnmt3b), a DNA methyltransferase involved in de novo DNA methylation, in the regulation of brown fat function and energy homeostasis. We generated a genetic model with Dnmt3b deletion in brown fat-skeletal lineage precursor cells (3bKO mice) by crossing Dnmt3b-floxed (fl/fl) mice with Myf5-Cre mice. Female 3bKO mice are prone to diet-induced obesity, which is associated with decreased energy expenditure. Dnmt3b deficiency also impairs cold-induced thermogenic program in brown fat. Surprisingly, further RNA-seq analysis reveals a profound up-regulation of myogenic markers in brown fat of 3bKO mice, suggesting a myocyte-like remodeling in brown fat. Further motif enrichment and pyrosequencing analysis suggests myocyte enhancer factor 2C (Mef2c) as a mediator for the myogenic alteration in Dnmt3b-deficient brown fat, as indicated by decreased methylation at its promoter. Our data demonstrate that brown fat Dnmt3b is a key regulator of brown fat development, energy metabolism and obesity in female mice.
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Affiliation(s)
- Shirong Wang
- Department of Biology, Georgia State University, Atlanta, GA 30303, USA; (S.W.); (Q.C.); (X.C.); (J.J.); (F.L.)
| | - Qiang Cao
- Department of Biology, Georgia State University, Atlanta, GA 30303, USA; (S.W.); (Q.C.); (X.C.); (J.J.); (F.L.)
| | - Xin Cui
- Department of Biology, Georgia State University, Atlanta, GA 30303, USA; (S.W.); (Q.C.); (X.C.); (J.J.); (F.L.)
| | - Jia Jing
- Department of Biology, Georgia State University, Atlanta, GA 30303, USA; (S.W.); (Q.C.); (X.C.); (J.J.); (F.L.)
| | - Fenfen Li
- Department of Biology, Georgia State University, Atlanta, GA 30303, USA; (S.W.); (Q.C.); (X.C.); (J.J.); (F.L.)
| | - Huidong Shi
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA;
| | - Bingzhong Xue
- Department of Biology, Georgia State University, Atlanta, GA 30303, USA; (S.W.); (Q.C.); (X.C.); (J.J.); (F.L.)
| | - Hang Shi
- Department of Biology, Georgia State University, Atlanta, GA 30303, USA; (S.W.); (Q.C.); (X.C.); (J.J.); (F.L.)
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160
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Sun A, Hu X, Chen H, Ma Y, Yan X, Peng D, Ping J, Yan Y. Ursolic acid induces white adipose tissue beiging in high-fat-diet obese male mice. Food Funct 2021; 12:6490-6501. [PMID: 34079975 DOI: 10.1039/d1fo00924a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Ursolic acid (UA) shows an effect on obesity and related metabolic diseases, but its mechanism of action remains unclear. We found that UA clearly reduced the body weight and adipose tissue mass and improved the glucose tolerance and insulin sensitivity in obese male mice. UA treatment significantly reduced the volume and weights of the epididymal white adipose tissue (eWAT) and inguinal subcutaneous white adipose tissue (igSWAT) of HFD-fed mice, respectively. UA also decreased the expression of genes involved in adipocyte differentiation and lipogenesis in igSWAT. Real-time PCR and immunohistochemistry showed that the expression of beiging-related genes 4-1BB factor (CD137), T-box transcription factor 1 (TBX1), and transmembrane protein 26 (TMEM26) were significantly increased in the UA treatment group. UA treatment significantly reduced the weight of gastrocnemius muscle (GM) and lipid droplets in the GM. UA treatment significantly upregulated the expression of PR domain-containing 16 (PRDM16), peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PGC-1α), and fibronectin type 3 domain-containing protein 5 (FNDC5) in GM and igSWAT. UA also stimulated irisin secretion in the serum. In conclusion, these results indicate that UA plays an anti-obesogenic role by increasing the secretion of irisin and promoting the beiging of WAT.
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Affiliation(s)
- Ao Sun
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China.
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161
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Gaggianesi M, Di Franco S, Pantina VD, Porcelli G, D'Accardo C, Verona F, Veschi V, Colarossi L, Faldetta N, Pistone G, Bongiorno MR, Todaro M, Stassi G. Messing Up the Cancer Stem Cell Chemoresistance Mechanisms Supported by Tumor Microenvironment. Front Oncol 2021; 11:702642. [PMID: 34354950 PMCID: PMC8330815 DOI: 10.3389/fonc.2021.702642] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 07/05/2021] [Indexed: 12/12/2022] Open
Abstract
Despite the recent advances in cancer patient management and in the development of targeted therapies, systemic chemotherapy is currently used as a first-line treatment for many cancer types. After an initial partial response, patients become refractory to standard therapy fostering rapid tumor progression. Compelling evidence highlights that the resistance to chemotherapeutic regimens is a peculiarity of a subpopulation of cancer cells within tumor mass, known as cancer stem cells (CSCs). This cellular compartment is endowed with tumor-initiating and metastasis formation capabilities. CSC chemoresistance is sustained by a plethora of grow factors and cytokines released by neighboring tumor microenvironment (TME), which is mainly composed by adipocytes, cancer-associated fibroblasts (CAFs), immune and endothelial cells. TME strengthens CSC refractoriness to standard and targeted therapies by enhancing survival signaling pathways, DNA repair machinery, expression of drug efflux transporters and anti-apoptotic proteins. In the last years many efforts have been made to understand CSC-TME crosstalk and develop therapeutic strategy halting this interplay. Here, we report the combinatorial approaches, which perturb the interaction network between CSCs and the different component of TME.
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Affiliation(s)
- Miriam Gaggianesi
- Department of Surgical Oncological and Stomatological Sciences (DICHIRONS), University of Palermo, Palermo, Italy
| | - Simone Di Franco
- Department of Surgical Oncological and Stomatological Sciences (DICHIRONS), University of Palermo, Palermo, Italy
| | - Vincenzo Davide Pantina
- Department of Surgical Oncological and Stomatological Sciences (DICHIRONS), University of Palermo, Palermo, Italy
| | - Gaetana Porcelli
- Department of Health Promotion Sciences, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy
| | - Caterina D'Accardo
- Department of Health Promotion Sciences, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy
| | - Francesco Verona
- Department of Health Promotion Sciences, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy
| | - Veronica Veschi
- Department of Surgical Oncological and Stomatological Sciences (DICHIRONS), University of Palermo, Palermo, Italy
| | | | - Naida Faldetta
- Department of Surgery, Villa Sofia-Cervello Hospital, Palermo, Italy
| | - Giuseppe Pistone
- Department of Health Promotion Sciences, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy
| | - Maria Rita Bongiorno
- Department of Health Promotion Sciences, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy
| | - Matilde Todaro
- Department of Health Promotion Sciences, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy
| | - Giorgio Stassi
- Department of Surgical Oncological and Stomatological Sciences (DICHIRONS), University of Palermo, Palermo, Italy
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162
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Ryan CR, Finch MS, Dunham TC, Murphy JE, Roy BD, MacPherson REK. Creatine Monohydrate Supplementation Increases White Adipose Tissue Mitochondrial Markers in Male and Female Rats in a Depot Specific Manner. Nutrients 2021; 13:2406. [PMID: 34371916 PMCID: PMC8308802 DOI: 10.3390/nu13072406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/23/2021] [Accepted: 06/25/2021] [Indexed: 12/14/2022] Open
Abstract
White adipose tissue (WAT) is a dynamic endocrine organ that can play a significant role in thermoregulation. WAT has the capacity to adopt structural and functional characteristics of the more metabolically active brown adipose tissue (BAT) and contribute to non-shivering thermogenesis under specific stimuli. Non-shivering thermogenesis was previously thought to be uncoupling protein 1 (UCP1)-dependent however, recent evidence suggests that UCP1-independent mechanisms of thermogenesis exist. Namely, futile creatine cycling has been identified as a contributor to WAT thermogenesis. The purpose of this study was to examine the efficacy of creatine supplementation to alter mitochondrial markers as well as adipocyte size and multilocularity in inguinal (iWAT), gonadal (gWAT), and BAT. Thirty-two male and female Sprague-Dawley rats were treated with varying doses (0 g/L, 2.5 g/L, 5 g/L, and 10 g/L) of creatine monohydrate for 8 weeks. We demonstrate that mitochondrial markers respond in a sex and depot specific manner. In iWAT, female rats displayed significant increases in COXIV, PDH-E1alpha, and cytochrome C protein content. Male rats exhibited gWAT specific increases in COXIV and PDH-E1alpha protein content. This study supports creatine supplementation as a potential method of UCP1-independant thermogenesis and highlights the importance of taking a sex-specific approach when examining the efficacy of browning therapeutics in future research.
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Affiliation(s)
- Chantal R. Ryan
- Department of Health Sciences, Brock University, St. Catharines, ON L2S 3A1, Canada; (C.R.R.); (M.S.F.)
| | - Michael S. Finch
- Department of Health Sciences, Brock University, St. Catharines, ON L2S 3A1, Canada; (C.R.R.); (M.S.F.)
| | - Tyler C. Dunham
- Department of Kinesiology, Brock University, St. Catharines, ON L2S 3A1, Canada; (T.C.D.); (J.E.M.); (B.D.R.)
| | - Jensen E. Murphy
- Department of Kinesiology, Brock University, St. Catharines, ON L2S 3A1, Canada; (T.C.D.); (J.E.M.); (B.D.R.)
| | - Brian D. Roy
- Department of Kinesiology, Brock University, St. Catharines, ON L2S 3A1, Canada; (T.C.D.); (J.E.M.); (B.D.R.)
| | - Rebecca E. K. MacPherson
- Department of Health Sciences, Brock University, St. Catharines, ON L2S 3A1, Canada; (C.R.R.); (M.S.F.)
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163
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Murugan DD, Balan D, Wong PF. Adipogenesis and therapeutic potentials of antiobesogenic phytochemicals: Insights from preclinical studies. Phytother Res 2021; 35:5936-5960. [PMID: 34219306 DOI: 10.1002/ptr.7205] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 05/21/2021] [Accepted: 06/17/2021] [Indexed: 12/11/2022]
Abstract
Obesity is one of the most serious public health problems in both developed and developing countries in recent years. While lifestyle and diet modifications are the most important management strategies of obesity, these may be insufficient to ensure long-term weight reduction in certain individuals and alternative strategies including pharmacotherapy need to be considered. However, drugs option remains limited due to low efficacy and adverse effects associated with their use. Hence, identification of safe and effective alternative therapeutic agents remains warranted to combat obesity. In recent years, bioactive phytochemicals are considered as valuable sources for the discovery of new pharmacological agents for the treatment of obesity. Adipocyte hypertrophy and hyperplasia increases with obesity and undergo molecular and cellular alterations that can affect systemic metabolism giving rise to metabolic syndrome and comorbidities such as type 2 diabetes and cardiovascular diseases. Many phytochemicals have been reported to target adipocytes by inhibiting adipogenesis, inducing lipolysis, suppressing the differentiation of preadipocytes to mature adipocytes, reducing energy intake, and boosting energy expenditure mainly in vitro and in animal studies. Nevertheless, further high-quality studies are needed to firmly establish the clinical efficacy of these phytochemicals. This review outlines common pathways involved in adipogenesis and phytochemicals targeting effector molecules of these pathways, the challenges faced and the way forward for the development of phytochemicals as antiobesity agents.
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Affiliation(s)
- Dharmani Devi Murugan
- Department of Pharmacology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Dharvind Balan
- Department of Pharmacology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Pooi-Fong Wong
- Department of Pharmacology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
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164
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Münzberg H, Floyd E, Chang JS. Sympathetic Innervation of White Adipose Tissue: to Beige or Not to Beige? Physiology (Bethesda) 2021; 36:246-255. [PMID: 34159808 DOI: 10.1152/physiol.00038.2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Obesity research progresses in understanding neuronal circuits and adipocyte biology to regulate metabolism. However, the interface of neuro-adipocyte interaction is less studied. We summarize the current knowledge of adipose tissue innervation and interaction with adipocytes and emphasize adipocyte transitions from white to brown adipocytes and vice versa. We further highlight emerging concepts for the differential neuronal regulation of brown/beige versus white adipocyte and the interdependence of both for metabolic regulation.
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Affiliation(s)
- Heike Münzberg
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana
| | - Elizabeth Floyd
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana
| | - Ji Suk Chang
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana
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165
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He F, Su W, Wu R, Li H, Lou L, Wu A, Xie L, Du Y, Wu S. The effect of cold exposure on serum cholesterol is dependent upon ApoE. J Therm Biol 2021; 99:102972. [PMID: 34420615 DOI: 10.1016/j.jtherbio.2021.102972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 04/11/2021] [Accepted: 04/12/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND Several lines of evidence indicate that cold stimulation may not only activate brown adipose tissue (BAT) and the white adipose tissue (WAT), but also regulate the lipid metabolism and influence the development of atherosclerosis. However, the study of cold exposure affecting cholesterol metabolism have opposite results in different experiments, and Apolipoprotein E (ApoE) may play an important role. There is still a lack of complete research to illustrate this problem. METHODS In this study, we first analyzed and discussed the activation of interscapular brown adipose tissue (iBAT), inguinal white adipose tissue (iWAT) and epididymal white adipose tissue (eWAT) under cold exposure (4 °C) in male wild-type C57BL/6 J (WT) and ApoE-deficient mice (ApoE-/-) fed high-fat diet (HFD) for 4 weeks. Subsequently, we investigated the effect of cold exposure on blood lipid profiles in both models. We further explored whether cold exposure can reduce serum cholesterol. RESULTS In both WT and ApoE-/- mice, cold exposure activates iBAT and iWAT, as well as hardly affects eWAT. In WT mice,4 weeks cold exposure (4 °C) reduces serum triglyceride by 28%, cholesterol by 30% and LDL-cholesterol by 63%. In ApoE-/- mice, cold stimulation decreases serum triglyceride by 59%, but increases cholesterol by 20% and LDL-cholesterol by 25%. CONCLUSIONS Based on these findings, we conclude that cold exposure decreases serum cholesterol is dependent upon the existence of ApoE.
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Affiliation(s)
- Fang He
- National Drug Clinical Trial Institution, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100700, China
| | - Wenquan Su
- National Drug Clinical Trial Institution, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100700, China
| | - Rongrong Wu
- National Drug Clinical Trial Institution, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100700, China
| | - He Li
- National Drug Clinical Trial Institution, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100700, China
| | - Lixia Lou
- Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100700, China
| | - Aiming Wu
- Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100700, China
| | - Lifang Xie
- Susan Samueli Integrative Health Institute, School of Medicine, University of California Irvine, USA
| | - Yawei Du
- National Drug Clinical Trial Institution, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100700, China.
| | - Shengxian Wu
- National Drug Clinical Trial Institution, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, 100700, China.
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166
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Ibáñez CF. Regulation of metabolic homeostasis by the TGF-β superfamily receptor ALK7. FEBS J 2021; 289:5776-5797. [PMID: 34173336 DOI: 10.1111/febs.16090] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 05/28/2021] [Accepted: 06/11/2021] [Indexed: 12/13/2022]
Abstract
ALK7 (Activin receptor-like kinase 7) is a member of the TGF-β receptor superfamily predominantly expressed by cells and tissues involved in endocrine functions, such as neurons of the hypothalamus and pituitary, pancreatic β-cells and adipocytes. Recent studies have begun to delineate the processes regulated by ALK7 in these tissues and how these become integrated with the homeostatic regulation of mammalian metabolism. The picture emerging indicates that ALK7's primary function in metabolic regulation is to limit catabolic activities and preserve energy. Aside of the hypothalamic arcuate nucleus, the function of ALK7 elsewhere in the brain, particularly in the cerebellum, where it is abundantly expressed, remains to be elucidated. Although our understanding of the basic molecular events underlying ALK7 signaling has benefited from the vast knowledge available on TGF-β receptor mechanisms, how these connect to the physiological functions regulated by ALK7 in different cell types is still incompletely understood. Findings of missense and nonsense variants in the Acvr1c gene, encoding ALK7, of some mouse strains and human subjects indicate a tolerance to ALK7 loss of function. Recent discoveries suggest that specific inhibitors of ALK7 may have therapeutic applications in obesity and metabolic syndrome without overt adverse effects.
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Affiliation(s)
- Carlos F Ibáñez
- Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.,Peking-Tsinghua Center for Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Peking University School of Life Sciences and Chinese Institute for Brain Research, Beijing, China.,Department of Physiology and Life Sciences Institute, National University of Singapore, Singapore
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167
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Seo SH, Jo SM, Truong TTM, Zhang G, Kim DS, Lee M, Lee Y, Kang I. Peanut sprout rich in p-coumaric acid ameliorates obesity and lipopolysaccharide-induced inflammation and the inhibition of browning in adipocytes via mitochondrial activation. Food Funct 2021; 12:5361-5374. [PMID: 33982705 DOI: 10.1039/d1fo00342a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Obesity is accompanied by adipose tissue inflammation that subsequently reduces thermogenic potential in brown and beige (brown-like) adipocytes. We previously reported that peanut sprout (PS) inhibited triglyceride accumulation via fatty acid oxidation in adipocytes. However, it is unknown whether PS reverses diet-induced obesity/inflammation and protects against the inflammation-induced inhibition of browning. To investigate this, C57BL/6 male mice, as an in vivo model, were randomly assigned to three different diets and fed for 8 weeks: (i) low-fat diet (LF, 11% kcal from fat), (ii) high-fat diet (HF, 61% kcal from fat), or (iii) HF diet with PS (4% PS in diet, HF + PS). As an in vitro model, lipopolysaccharides (LPS)-induced macrophages and 3T3-L1 adipocytes in the absence (white adipocytes) or presence of dibutyryl-cAMP (Bt-cAMP, beige adipocytes) were used. The supplementation of PS improved HF-diet-mediated body weight gain, dyslipidemia, and hyperglycemia as compared to the HF group. Although there was a marginal impact on visceral hypertrophy, PS reversed the adipocyte inflammation. In parallel, LPS-mediated induction of inflammation was impeded by PS extract (PSE) in macrophages and adipocytes. PSE also protected against LPS-induced suppression of adipocyte browning in Bt-cAMP-treated adipocytes with mitochondrial activation. The phenolic acid analysis showed that among the constituent of PSE, p-coumaric acid (PCA) was identified as a polyphenol that showed a similar effect to PSE. PCA treatment was also able to maintain a higher temperature than the control group upon cold exposure. Taken together, PCA-enriched PS attenuated HF-diet-induced obesity and protected against LPS-induced inflammation and the inhibition of browning via mitochondrial activation.
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Affiliation(s)
- Seok Hee Seo
- Department of Food Science and Nutrition, Jeju National University, Jeju 63243, Korea.
| | - Sang-Mi Jo
- Department of Food Science and Nutrition, Jeju National University, Jeju 63243, Korea.
| | - Tien Thi My Truong
- Interdisciplinary Graduate Program in Advanced Convergence Technology and Science, Jeju National University, Jeju 63243, Korea
| | - Guiguo Zhang
- College of Animal Sciences and Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, 61 Daizong Street, Taian City, Shandong Province 271018, China
| | - Dong-Shin Kim
- Department of Food Bioengineering, Jeju National University, Jeju 63243, Korea
| | - Myoungsook Lee
- Department of Food and Nutrition, Sungshin Women's University, Seoul 01133, Korea
| | - Yunkyoung Lee
- Department of Food Science and Nutrition, Jeju National University, Jeju 63243, Korea. and Interdisciplinary Graduate Program in Advanced Convergence Technology and Science, Jeju National University, Jeju 63243, Korea
| | - Inhae Kang
- Department of Food Science and Nutrition, Jeju National University, Jeju 63243, Korea. and Interdisciplinary Graduate Program in Advanced Convergence Technology and Science, Jeju National University, Jeju 63243, Korea
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Arfuso F, Giannetto C, Panzera MF, Fazio F, Piccione G. Uncoupling Protein-1 (UCP1) in the Adult Horse: Correlations with Body Weight, Rectal Temperature and Lipid Profile. Animals (Basel) 2021; 11:ani11061836. [PMID: 34202932 PMCID: PMC8235278 DOI: 10.3390/ani11061836] [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: 05/24/2021] [Revised: 06/15/2021] [Accepted: 06/18/2021] [Indexed: 11/23/2022] Open
Abstract
Simple Summary Uncoupling protein-1 (UCP1) plays important roles in the energy balance and regulation of metabolism and in the body temperature regulation. In this survey the correlation among UCP1, body weight, rectal temperature and lipid profile was assessed in the adult horse. The findings gathered from the current survey showed that UCP1 values are not related with body weight and temperature in studied animals, but they seem to be linked to pathways involved in lipid and lipoprotein metabolism. Abstract This study aimed to evaluate the possible relationship among UCP1, body weight, rectal temperature and lipid profile in the horse. Thirty clinically healthy Italian Saddle geldings (6–10 years old) were enrolled after the informed owners’ consent. All horses were blood sampled and their body weight and rectal temperatures were recorded. On the sera obtained after blood centrifugation the concentration of UCP1, total lipids, phospholipids, non-esterified fatty acids (NEFAs), triglycerides, total cholesterol, high density lipoproteins (HDLs), low density lipoproteins (LDLs) and very low density lipoprotein fraction (VLDLs) was evaluated. Pearson’s correlation analysis was applied to assess the possible relationship between serum UCP1 concentration and the values of body weight, rectal temperature and lipid parameters. Serum UCP1 concentration showed no correlation with body weight, rectal temperature, HDLs and LDLs values, whereas it correlated negatively with serum total lipids, phospholipids, NEFAs, total cholesterol, triglycerides and VLDLs values (p < 0.0001). The findings suggest that in the adult horse the role of UCP1 is linked to the lipid metabolism rather than to thermoregulation.
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Affiliation(s)
- Francesca Arfuso
- Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy; (C.G.); (F.F.); (G.P.)
- Correspondence: ; Tel.: +39-(090)-6766726
| | - Claudia Giannetto
- Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy; (C.G.); (F.F.); (G.P.)
| | - Maria Francesca Panzera
- Department of Biomedical, Dental, Morphological and Functional Images, University of Messina, Via Consolare Valeria, 98125 Messina, Italy;
| | - Francesco Fazio
- Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy; (C.G.); (F.F.); (G.P.)
| | - Giuseppe Piccione
- Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy; (C.G.); (F.F.); (G.P.)
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169
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Crudele L, Piccinin E, Moschetta A. Visceral Adiposity and Cancer: Role in Pathogenesis and Prognosis. Nutrients 2021; 13:2101. [PMID: 34205356 PMCID: PMC8234141 DOI: 10.3390/nu13062101] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/14/2021] [Accepted: 06/16/2021] [Indexed: 12/11/2022] Open
Abstract
The prevalence of being overweight and obese has been expanded dramatically in recent years worldwide. Obesity usually occurs when the energetic introit overtakes energy expenditure from metabolic and physical activity, leading to fat accumulation mainly in the visceral depots. Excessive fat accumulation represents a risk factor for many chronic diseases, including cancer. Adiposity, chronic low-grade inflammation, and hyperinsulinemia are essential factors of obesity that also play a crucial role in tumor onset. In recent years, several strategies have been pointed toward boundary fat accumulation, thus limiting the burden of cancer attributable to obesity. While remodeling fat via adipocytes browning seems a tempting prospect, lifestyle interventions still represent the main pathway to prevent cancer and enhance the efficacy of treatments. Specifically, the Mediterranean Diet stands out as one of the best dietary approaches to curtail visceral adiposity and, therefore, cancer risk. In this Review, the close relationship between obesity and cancer has been investigated, highlighting the biological mechanisms at the basis of this link. Finally, strategies to remodel fat, including browning and lifestyle interventions, have been taken into consideration as a major perspective to limit excess body weight and tumor onset.
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Affiliation(s)
- Lucilla Crudele
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy; (L.C.); (E.P.)
- Department of Biomedical Sciences and Human Oncology, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Elena Piccinin
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy; (L.C.); (E.P.)
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Antonio Moschetta
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy; (L.C.); (E.P.)
- INBB, National Institute for Biostructures and Biosystems, 00136 Rome, Italy
- National Cancer Center, IRCCS Istituto Tumori Giovanni Paolo II, 70124 Bari, Italy
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170
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Impaired Leptin Signalling in Obesity: Is Leptin a New Thermolipokine? Int J Mol Sci 2021; 22:ijms22126445. [PMID: 34208585 PMCID: PMC8235268 DOI: 10.3390/ijms22126445] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 06/03/2021] [Accepted: 06/10/2021] [Indexed: 12/17/2022] Open
Abstract
Leptin is a principal adipose-derived hormone mostly implicated in the regulation of energy balance through the activation of anorexigenic neuronal pathways. Comprehensive studies have established that the maintenance of certain concentrations of circulating leptin is essential to avoid an imbalance in nutrient intake. Indeed, genetic modifications of the leptin/leptin receptor axis and the obesogenic environment may induce changes in leptin levels or action in a manner that accelerates metabolic dysfunctions, resulting in a hyperphagic status and adipose tissue expansion. As a result, a vicious cycle begins wherein hyperleptinaemia and leptin resistance occur, in turn leading to increased food intake and fat enlargement, which is followed by leptin overproduction. In addition, in the context of obesity, a defective thermoregulatory response is associated with impaired leptin signalling overall within the ventromedial nucleus of the hypothalamus. These recent findings highlight the role of leptin in the regulation of adaptive thermogenesis, thus suggesting leptin to be potentially considered as a new thermolipokine. This review provides new insight into the link between obesity, hyperleptinaemia, leptin resistance and leptin deficiency, focusing on the ability to restore leptin sensitiveness by way of enhanced thermogenic responses and highlighting novel anti-obesity therapeutic strategies.
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171
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Cero C, Lea HJ, Zhu KY, Shamsi F, Tseng YH, Cypess AM. β3-Adrenergic receptors regulate human brown/beige adipocyte lipolysis and thermogenesis. JCI Insight 2021; 6:e139160. [PMID: 34100382 PMCID: PMC8262278 DOI: 10.1172/jci.insight.139160] [Citation(s) in RCA: 95] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 04/28/2021] [Indexed: 12/12/2022] Open
Abstract
β3-Adrenergic receptors (β3-ARs) are the predominant regulators of rodent brown adipose tissue (BAT) thermogenesis. However, in humans, the physiological relevance of BAT and β3-AR remains controversial. Herein, using primary human adipocytes from supraclavicular neck fat and immortalized brown/beige adipocytes from deep neck fat from 2 subjects, we demonstrate that the β3-AR plays a critical role in regulating lipolysis, glycolysis, and thermogenesis. Silencing of the β3-AR compromised genes essential for thermogenesis, fatty acid metabolism, and mitochondrial mass. Functionally, reduction of β3-AR lowered agonist-mediated increases in intracellular cAMP, lipolysis, and lipolysis-activated, uncoupling protein 1-mediated thermogenic capacity. Furthermore, mirabegron, a selective human β3-AR agonist, stimulated BAT lipolysis and thermogenesis, and both processes were lost after silencing β3-AR expression. This study highlights that β3-ARs in human brown/beige adipocytes are required to maintain multiple components of the lipolytic and thermogenic cellular machinery and that β3-AR agonists could be used to achieve metabolic benefit in humans.
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Affiliation(s)
- Cheryl Cero
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH, Bethesda, Maryland, USA
| | - Hannah J Lea
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH, Bethesda, Maryland, USA
| | - Kenneth Y Zhu
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH, Bethesda, Maryland, USA
| | - Farnaz Shamsi
- Integrative Physiology and Metabolism Section, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Yu-Hua Tseng
- Integrative Physiology and Metabolism Section, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Aaron M Cypess
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH, Bethesda, Maryland, USA
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172
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Gallardo-Montejano VI, Yang C, Hahner L, McAfee JL, Johnson JA, Holland WL, Fernandez-Valdivia R, Bickel PE. Perilipin 5 links mitochondrial uncoupled respiration in brown fat to healthy white fat remodeling and systemic glucose tolerance. Nat Commun 2021; 12:3320. [PMID: 34083525 PMCID: PMC8175597 DOI: 10.1038/s41467-021-23601-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 04/28/2021] [Indexed: 02/06/2023] Open
Abstract
Exposure of mice or humans to cold promotes significant changes in brown adipose tissue (BAT) with respect to histology, lipid content, gene expression, and mitochondrial mass and function. Herein we report that the lipid droplet coat protein Perilipin 5 (PLIN5) increases markedly in BAT during exposure of mice to cold. To understand the functional significance of cold-induced PLIN5, we created and characterized gain- and loss-of-function mouse models. Enforcing PLIN5 expression in mouse BAT mimics the effects of cold with respect to mitochondrial cristae packing and uncoupled substrate-driven respiration. PLIN5 is necessary for the maintenance of mitochondrial cristae structure and respiratory function during cold stress. We further show that promoting PLIN5 function in BAT is associated with healthy remodeling of subcutaneous white adipose tissue and improvements in systemic glucose tolerance and diet-induced hepatic steatosis. These observations will inform future strategies that seek to exploit thermogenic adipose tissue as a therapeutic target for type 2 diabetes, obesity, and nonalcoholic fatty liver disease. Perilipin 5 is a lipid droplet protein that interacts with PGC1α in the nucleus to regulate mitochondrial metabolism. Here the authors use genetically engineered mouse models to determine the physiologic role of Perilipin 5, and show that it regulates mitochondrial adaptations to cold, as well as systemic energy metabolism.
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Affiliation(s)
- Violeta I Gallardo-Montejano
- Division of Endocrinology, Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Chaofeng Yang
- Division of Endocrinology, Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Lisa Hahner
- Division of Endocrinology, Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - John L McAfee
- Division of Endocrinology, Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX, USA.,Pathology and Laboratory Medicine Institute, Cleveland, OH, USA
| | - Joshua A Johnson
- Touchstone Diabetes Center, Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - William L Holland
- Touchstone Diabetes Center, Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX, USA.,Department of Nutrition and Integrative Physiology and the Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, UT, USA
| | | | - Perry E Bickel
- Division of Endocrinology, Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX, USA.
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173
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Gene Expression Analysis of Environmental Temperature and High-Fat Diet-Induced Changes in Mouse Supraclavicular Brown Adipose Tissue. Cells 2021; 10:cells10061370. [PMID: 34199472 PMCID: PMC8226907 DOI: 10.3390/cells10061370] [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: 02/23/2021] [Revised: 05/26/2021] [Accepted: 05/29/2021] [Indexed: 12/16/2022] Open
Abstract
Obesity, a dysregulation of adipose tissue, is a major health risk factor associated with many diseases. Brown adipose tissue (BAT)-mediated thermogenesis can potentially regulate energy expenditure, making it an attractive therapeutic target to combat obesity. Here, we characterize the effects of cold exposure, thermoneutrality, and high-fat diet (HFD) feeding on mouse supraclavicular BAT (scBAT) morphology and BAT-associated gene expression compared to other adipose depots, including the interscapular BAT (iBAT). scBAT was as sensitive to cold induced thermogenesis as iBAT and showed reduced thermogenic effect under thermoneutrality. While both scBAT and iBAT are sensitive to cold, the expression of genes involved in nutrient processing is different. The scBAT also showed less depot weight gain and more single-lipid adipocytes, while the expression of BAT thermogenic genes, such as Ucp1, remained similar or increased more under our HFD feeding regime at ambient and thermoneutral temperatures than iBAT. Together, these findings show that, in addition to its anatomical resemblance to human scBAT, mouse scBAT possesses thermogenic features distinct from those of other adipose depots. Lastly, this study also characterizes a previously unknown mouse deep neck BAT (dnBAT) depot that exhibits similar thermogenic characteristics as scBAT under cold exposure and thermoneutrality.
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174
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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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175
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The paper that found a third form of fat cell. J Biol Chem 2021; 296:100817. [PMID: 34023386 PMCID: PMC8215298 DOI: 10.1016/j.jbc.2021.100817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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176
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Youssef AM, Mohamed DA, Hussein S, Abdullah DM, Abdelrahman SA. Effects of Quercetin and Coenzyme Q10 on Biochemical, Molecular, and Morphological Parameters of Skeletal Muscle in Trained Diabetic Rats. Curr Mol Pharmacol 2021; 15:239-251. [PMID: 34061009 DOI: 10.2174/1874467214666210521170339] [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: 10/26/2020] [Revised: 01/28/2021] [Accepted: 01/29/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Diabetes mellitus (DM) affects the musculoskeletal system through its metabolic perturbations. Exercise modulates blood sugar levels and increases the body's sensitivity to insulin in patients with DM. OBJECTIVE This study aimed to investigate the potential effects of combined quercetin and coenzyme Q10 (CoQ10) supplements with or without exercise on the histological, biochemical and molecular structures of diabetic rat's skeletal muscle. METHOD A total of 64 adult male albino rats were divided into six groups: control, trained nondiabetic, non-trained diabetic, diabetic rats treated with combined CoQ10 and quercetin, diabetic rats with treadmill training, and diabetic rats treated with treadmill training and CoQ10 and quercetin. Blood and skeletal muscle samples were obtained from all groups for routine histological examination and biochemical determination of cytokine levels and protein activities. Quantitative real-time polymerase chain reaction (qRT-PCR) and morphometric analysis of PAS and Bax expressions were also performed. RESULTS Biochemical analysis revealed improvement in all studied parameters with combined CoQ10 and quercetin than exercise training alone. Combined treatment and exercise showed significant improvement in all parameters especially interleukin 6 and malondialdehyde. Fibronectin type III domain-containing protein 5 (FNDC5) expression and irisin levels increased in all trained groups but combined treatment with exercise significantly increased their levels than exercise alone. Histological analysis revealed improvement after exercise or combined treatment; however, when exercise was combined with CoQ10 and quercetin, marked improvement was observed. CONCLUSION the combination of CoQ10 and quercetin could be promising in preserving musculoskeletal function in patients with DM concomitantly with physical exercise.
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Affiliation(s)
- Amal M Youssef
- Department of Physiology, Faculty of Medicine, Taibah University, Medinah, Saudi Arabia
| | - Dalia A Mohamed
- Medical Histology and Cell Biology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Samia Hussein
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Doaa M Abdullah
- Pharmacology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Shaimaa A Abdelrahman
- Medical Histology and Cell Biology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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177
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Chen X, Xie J, Tan Q, Li H, Lu J, Zhang X. Genistein improves systemic metabolism and enhances cold resistance by promoting adipose tissue beiging. Biochem Biophys Res Commun 2021; 558:154-160. [PMID: 33915329 DOI: 10.1016/j.bbrc.2021.04.067] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 04/16/2021] [Indexed: 12/31/2022]
Abstract
Genistein, a naturally occurring phytoestrogen and a member of the large class of compounds known as isoflavones, exerts protective effects in several diseases. Recent studies indicate that genistein plays a critical role in controlling body weight, obesity-associated insulin resistance, and metabolic disorders, but its target organs in reversing obesity and related pathological conditions remain unclear. In this study, we showed that mice supplemented with 0.2% genistein in a high-fat diet for 12 weeks showed enhanced metabolic homeostasis, including reduced obesity, improved glucose uptake and insulin sensitivity, and alleviated hepatic steatosis. We also observed a beiging phenomenon in the white adipose tissue and reversal of brown adipose tissue whitening in these mice. These changes led to enhanced resistance to cold stress. Altogether, our data suggest that the improved metabolic profile in mice treated with genistein is likely a result of enhanced adipose tissue function.
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Affiliation(s)
- Xi Chen
- Department of Pediatrics, Affiliated Haikou Hospital of Xiangya Medical College, Central South University, Haikou, 570208, China; Department of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, 410010, China.
| | - Juanyu Xie
- Department of Cardiovascular Surgery, The Second Xiangya Hospital, Central South University, Changsha, 410010, China.
| | - Qingqing Tan
- Department of Biology, School of Arts and Sciences, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
| | - Huan Li
- Department of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, 410010, China.
| | - Jun Lu
- Department of Pediatrics, Affiliated Haikou Hospital of Xiangya Medical College, Central South University, Haikou, 570208, China.
| | - Xingxing Zhang
- Department of Pediatrics, The Second Xiangya Hospital, Central South University, Changsha, 410010, China.
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178
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Atakan MM, Koşar ŞN, Güzel Y, Tin HT, Yan X. The Role of Exercise, Diet, and Cytokines in Preventing Obesity and Improving Adipose Tissue. Nutrients 2021; 13:nu13051459. [PMID: 33922998 PMCID: PMC8145589 DOI: 10.3390/nu13051459] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/20/2021] [Accepted: 04/22/2021] [Indexed: 12/17/2022] Open
Abstract
The prevalence of obesity continues to rise worldwide despite evidence-based public health recommendations. The promise to adopt a healthy lifestyle is increasingly important for tackling this global epidemic. Calorie restriction or regular exercise or a combination of the two is accepted as an effective strategy in preventing or treating obesity. Furthermore, the benefits conferred by regular exercise to overcome obesity are attributed not only to reduced adiposity or reduced levels of circulating lipids but also to the proteins, peptides, enzymes, and metabolites that are released from contracting skeletal muscle or other organs. The secretion of these molecules called cytokines in response to exercise induces browning of white adipose tissue by increasing the expression of brown adipocyte-specific genes within the white adipose tissue, suggesting that exercise-induced cytokines may play a significant role in preventing obesity. In this review, we present research-based evidence supporting the effects of exercise and various diet interventions on preventing obesity and adipose tissue health. We also discuss the interplay between adipose tissue and the cytokines secreted from skeletal muscle and other organs that are known to affect adipose tissue and metabolism.
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Affiliation(s)
- Muhammed Mustafa Atakan
- Division of Exercise Nutrition and Metabolism, Faculty of Sport Sciences, Hacettepe University, 06800 Ankara, Turkey; (M.M.A.); (Ş.N.K.); (Y.G.)
| | - Şükran Nazan Koşar
- Division of Exercise Nutrition and Metabolism, Faculty of Sport Sciences, Hacettepe University, 06800 Ankara, Turkey; (M.M.A.); (Ş.N.K.); (Y.G.)
| | - Yasemin Güzel
- Division of Exercise Nutrition and Metabolism, Faculty of Sport Sciences, Hacettepe University, 06800 Ankara, Turkey; (M.M.A.); (Ş.N.K.); (Y.G.)
| | - Hiu Tung Tin
- Institute for Health and Sport (iHeS), Victoria University, P.O. Box 14428, Melbourne 8001, Australia;
| | - Xu Yan
- Institute for Health and Sport (iHeS), Victoria University, P.O. Box 14428, Melbourne 8001, Australia;
- Sarcopenia Research Program, Australia Institute for Musculoskeletal Sciences (AIMSS), Melbourne 3021, Australia
- Correspondence: ; Tel.: +61-3-9919-4024; Fax: +61-3-9919-5615
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179
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Shinde AB, Song A, Wang QA. Brown Adipose Tissue Heterogeneity, Energy Metabolism, and Beyond. Front Endocrinol (Lausanne) 2021; 12:651763. [PMID: 33953697 PMCID: PMC8092391 DOI: 10.3389/fendo.2021.651763] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Accepted: 03/18/2021] [Indexed: 01/19/2023] Open
Abstract
Brown adipocyte in brown adipose tissue (BAT) specializes in expending energy through non-shivering thermogenesis, a process that produces heat either by uncoupling protein 1 (UCP1) dependent uncoupling of mitochondrial respiration or by UCP1 independent mechanisms. Apart from this, there is ample evidence suggesting that BAT has an endocrine function. Studies in rodents point toward its vital roles in glucose and lipid homeostasis, making it an important therapeutic target for treating metabolic disorders related to morbidities such as obesity and type 2 diabetes. The rediscovery of thermogenically active BAT depots in humans by several independent research groups in the last decade has revitalized interest in BAT as an even more promising therapeutic intervention. Over the last few years, there has been overwhelming interest in understanding brown adipocyte's developmental lineages and how brown adipocyte uniquely utilizes energy beyond UCP1 mediated uncoupling respiration. These new discoveries would be leveraged for designing novel therapeutic interventions for metabolic disorders.
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Affiliation(s)
- Abhijit Babaji Shinde
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope Medical Center, Duarte, CA, United States
| | - Anying Song
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope Medical Center, Duarte, CA, United States
| | - Qiong A. Wang
- Department of Molecular & Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope Medical Center, Duarte, CA, United States
- Comprehensive Cancer Center, Beckman Research Institute, City of Hope Medical Center, Duarte, CA, United States
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180
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Piquer-Garcia I, Cereijo R, Corral-Pérez J, Pellitero S, Martínez E, Taxerås SD, Tarascó J, Moreno P, Balibrea J, Puig-Domingo M, Serra D, Herrero L, Jiménez-Pavón D, Lerin C, Villarroya F, Sánchez-Infantes D. Use of Infrared Thermography to Estimate Brown Fat Activation After a Cooling Protocol in Patients with Severe Obesity That Underwent Bariatric Surgery. Obes Surg 2021; 30:2375-2381. [PMID: 32133589 DOI: 10.1007/s11695-020-04502-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
BACKGROUND In contrast to the energy-storing role of white adipose tissue (WAT), brown adipose tissue (BAT) acts as the main site of non-shivering thermogenesis in mammals and has been reported to play a role in protection against obesity and associated metabolic alterations in rodents. Infrared thermography (IRT) has been proposed as a novel non-invasive, safe, and quick method to estimate BAT thermogenic activation in humans. The aim of this study is to determine whether the IRT could be a potential new tool to estimate BAT thermogenic activation in patients with severe obesity in response to bariatric surgery. METHODS Supraclavicular BAT thermogenic activation was evaluated using IRT in a cohort of 31 patients (50 ± 10 years old, BMI = 44.5 ± 7.8; 15 undergoing laparoscopy sleeve gastrectomy and 16 Roux-en-Y gastric bypass) at baseline and 6 months after a bariatric surgery. Clinical parameters were determined at these same time points. RESULTS Supraclavicular BAT-related activity was detected in our patients by IRT after a cooling stimulus. The BAT thermogenic activation was higher at 6 months after laparoscopy sleeve gastrectomy (0.06 ± 0.1 vs 0.32 ± 0.1), while patients undergoing to a roux-en-Y gastric bypass did not change their thermogenic response using the same cooling stimulus (0.09 ± 0.1 vs 0.08 ± 0.1). CONCLUSIONS Our study postulates the IRT as a potential tool to evaluate BAT thermogenic activation in patients with obesity before and after a bariatric surgery. Further studies are needed to evaluate differences between LSG technique and RYGB on BAT activation.
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Affiliation(s)
| | - Rubén Cereijo
- Department of Biochemistry and Molecular Biomedicine, and Institute of Biomedicine, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica de Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, 28029, Madrid, Spain
| | - Juan Corral-Pérez
- MOVE-IT Research Group and Department of Physical Education, Faculty of Education Sciences, University of Cádiz, Cadiz, Spain.,Institute of Research and Innovation in Biomedical Sciences of the Province of Cádiz (INiBICA), University of Cádiz, Cadiz, Spain
| | - Silvia Pellitero
- Germans Trias i Pujol Research Institute, Barcelona, Spain.,Centro de Investigación Biomédica en Fisiopatología de la Diabetes y enfermedades metabólicas (CIBERDEM), ISCIII, Madrid, Spain
| | - Eva Martínez
- Germans Trias i Pujol Research Institute, Barcelona, Spain
| | - Siri D Taxerås
- Germans Trias i Pujol Research Institute, Barcelona, Spain
| | - Jordi Tarascó
- Germans Trias i Pujol Research Institute, Barcelona, Spain
| | - Pau Moreno
- Germans Trias i Pujol Research Institute, Barcelona, Spain
| | - José Balibrea
- Metabolic and Bariatric Surgery Unit, EAC-BS Center of Excellence, Vall d'Hebron University Hospital, Barcelona, Spain
| | - Manel Puig-Domingo
- Germans Trias i Pujol Research Institute, Barcelona, Spain.,Centro de Investigación Biomédica en Fisiopatología de la Diabetes y enfermedades metabólicas (CIBERDEM), ISCIII, Madrid, Spain
| | - Dolors Serra
- Centro de Investigación Biomédica de Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, 28029, Madrid, Spain.,Department of Biochemistry and Physiology, School of Pharmacy, Institut de Biomedicina de la Universitat de Barcelona (IBUB),, Universitat de Barcelona, 08028, Barcelona, Spain
| | - Laura Herrero
- Centro de Investigación Biomédica de Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, 28029, Madrid, Spain.,Department of Biochemistry and Physiology, School of Pharmacy, Institut de Biomedicina de la Universitat de Barcelona (IBUB),, Universitat de Barcelona, 08028, Barcelona, Spain
| | - David Jiménez-Pavón
- MOVE-IT Research Group and Department of Physical Education, Faculty of Education Sciences, University of Cádiz, Cadiz, Spain.,Institute of Research and Innovation in Biomedical Sciences of the Province of Cádiz (INiBICA), University of Cádiz, Cadiz, Spain
| | - Carles Lerin
- Endocrinology department, Institut de Recerca Sant Joan de Déu, 08950, Barcelona, Spain
| | - Francesc Villarroya
- Department of Biochemistry and Molecular Biomedicine, and Institute of Biomedicine, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica de Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, 28029, Madrid, Spain
| | - David Sánchez-Infantes
- Germans Trias i Pujol Research Institute, Barcelona, Spain. .,Centro de Investigación Biomédica de Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, 28029, Madrid, Spain. .,Germans Trias i Pujol Research Institute (IGTP), Campus Can Ruti, Carretera de Can Ruti, Camí de les Escoles s/n, Badalona, 08916, Barcelona, Spain.
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181
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Moser C, Straub LG, Rachamin Y, Dapito DH, Kulenkampff E, Ding L, Sun W, Modica S, Balaz M, Wolfrum C. Quantification of adipocyte numbers following adipose tissue remodeling. Cell Rep 2021; 35:109023. [PMID: 33909996 DOI: 10.1016/j.celrep.2021.109023] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 12/21/2020] [Accepted: 04/01/2021] [Indexed: 01/23/2023] Open
Abstract
To analyze the capacity of white and brown adipose tissue remodeling, we developed two mouse lines to label, quantitatively trace, and ablate white, brown, and brite/beige adipocytes at different ambient temperatures. We show here that the brown adipocytes are recruited first and reach a peak after 1 week of cold stimulation followed by a decline during prolonged cold exposure. On the contrary, brite/beige cell numbers plateau after 3 weeks of cold exposure. At thermoneutrality, brown adipose tissue, in spite of being masked by a white-like morphology, retains its brown-like physiology, as Ucp1+ cells can be recovered immediately upon beta3-adrenergic stimulation. We further demonstrate that the recruitment of Ucp1+ cells in response to cold is driven by existing adipocytes. In contrast, the regeneration of the interscapular brown adipose tissue following ablation of Ucp1+ cells is driven by de novo differentiation.
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Affiliation(s)
- Caroline Moser
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Leon G Straub
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Yael Rachamin
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Dianne H Dapito
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Elisabeth Kulenkampff
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Lianggong Ding
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Wenfei Sun
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Salvatore Modica
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Miroslav Balaz
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland
| | - Christian Wolfrum
- Institute of Food Nutrition and Health, Eidgenössische Technische Hochschule Zürich (ETH), Schwerzenbach 8603, Switzerland.
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182
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Jeon HJ, Choi DK, Choi J, Lee S, Lee H, Yu JH, Min SH. D-Mannitol Induces a Brown Fat-like Phenotype via a β3-Adrenergic Receptor-Dependent Mechanism. Cells 2021; 10:cells10040768. [PMID: 33807329 PMCID: PMC8066535 DOI: 10.3390/cells10040768] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 03/26/2021] [Accepted: 03/28/2021] [Indexed: 11/17/2022] Open
Abstract
The presence of brown adipocytes within white adipose tissue is associated with phenotypes that exhibit improved metabolism and proper body weight maintenance. Therefore, a variety of dietary agents that facilitate the browning of white adipocytes have been investigated. In this study, we screened a natural product library comprising 133 compounds with the potential to promote the browning of white adipocytes, and found that D-mannitol induces the browning of 3T3-L1 adipocytes by enhancing the expression of brown fat-specific genes and proteins, and upregulating lipid metabolism markers. D-mannitol also increased the phosphorylation of AMP-activated protein kinase (AMPK) and acetyl-CoA carboxylase 1 (ACC), suggesting a possible role in lipolysis and fat oxidation. Moreover, an increase in the expression of genes associated with D-mannitol-induced browning was strongly correlated with the activation of the β3-adrenergic receptor as well as AMPK, protein kinase A (PKA), and PPARγ coactivator 1α (PGC1α). D-mannitol effectively reduced the body weight of mice fed a high-fat diet, and increased the expression of β1-oxidation and energy expenditure markers, such as Cidea, carnitine palmityl transferase 1 (CPT1), uncoupling protein 1 (UCP1), PGC1α, and acyl-coenzyme A oxidase (ACOX1) in the inguinal white adipose tissue. Our findings suggest that D-mannitol plays a dual regulatory role by inducing the generation of a brown fat-like phenotype and enhancing lipid metabolism. These results indicate that D-mannitol can function as an anti-obesity supplement.
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183
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Sanders OD, Rajagopal JA, Rajagopal L. Menthol to Induce Non-shivering Thermogenesis via TRPM8/PKA Signaling for Treatment of Obesity. J Obes Metab Syndr 2021; 30:4-11. [PMID: 33071240 PMCID: PMC8017329 DOI: 10.7570/jomes20038] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 05/25/2020] [Accepted: 06/12/2020] [Indexed: 12/25/2022] Open
Abstract
Increasing basal energy expenditure via uncoupling protein 1 (UCP1)-dependent non-shivering thermogenesis is an attractive therapeutic strategy for treatment of obesity. Transient receptor potential melastatin 8 (TRPM8) channel activation by cold and cold mimetics induces UCP1 transcription and prevents obesity in animals, but the clinical relevance of this relationship remains incompletely understood. A review of TRPM8 channel agonism for treatment of obesity focusing on menthol was undertaken. Adipocyte TRPM8 activation results in Ca2+ influx and protein kinase A (PKA) activation, which induces mitochondrial elongation, mitochondrial localization to lipid droplets, lipolysis, β-oxidation, and UCP1 expression. Ca2+-induced mitochondrial reactive oxygen species activate UCP1. In animals, TRPM8 agonism increases basal metabolic rate, non-shivering thermogenesis, oxygen consumption, exercise endurance, and fatty acid oxidation and decreases abdominal fat percentage. Menthol prevents high-fat diet-induced obesity, glucose intolerance, insulin resistance, and liver triacylglycerol accumulation. Hypothalamic TRPM8 activation releases glucagon, which activates PKA and promotes catabolism. TRPM8 polymorphisms are associated with obesity. In humans, oral menthol and other TRPM8 agonists have little effect. However, topical menthol appears to increase core body temperature and metabolic rate. A randomized clinical control trial of topical menthol in obese patients is warranted.
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Affiliation(s)
| | | | - Lekshmy Rajagopal
- Oto-Rhino-Laryngology, College of Physicians and Surgeons, Mumbai, India
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184
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Adipose stem cells in obesity: challenges and opportunities. Biosci Rep 2021; 40:225001. [PMID: 32452515 PMCID: PMC7284323 DOI: 10.1042/bsr20194076] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 05/08/2020] [Accepted: 05/22/2020] [Indexed: 02/07/2023] Open
Abstract
Adipose tissue, the storage of excessive energy in the body, secretes various proteins called adipokines, which connect the body’s nutritional status to the regulation of energy balance. Obesity triggers alterations of quantity and quality of various types of cells that reside in adipose tissue, including adipose stem cells (ASCs; referred to as adipose-derived stem/stromal cells in vitro). These alterations in the functionalities and properties of ASCs impair adipose tissue remodeling and adipose tissue function, which induces low-grade systemic inflammation, progressive insulin resistance, and other metabolic disorders. In contrast, the ability of ASCs to recruit new adipocytes when faced with caloric excess leads to healthy adipose tissue expansion, associated with lower amounts of inflammation, fibrosis, and insulin resistance. This review focuses on recent advances in our understanding of the identity of ASCs and their roles in adipose tissue development, homeostasis, expansion, and thermogenesis, and how these roles go awry in obesity. A better understanding of the biology of ASCs and their adipogenesis may lead to novel therapeutic targets for obesity and metabolic disease.
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185
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Finlin BS, Memetimin H, Zhu B, Confides AL, Vekaria HJ, El Khouli RH, Johnson ZR, Westgate PM, Chen J, Morris AJ, Sullivan PG, Dupont-Versteegden EE, Kern PA. Pioglitazone does not synergize with mirabegron to increase beige fat or further improve glucose metabolism. JCI Insight 2021; 6:143650. [PMID: 33571166 PMCID: PMC8026187 DOI: 10.1172/jci.insight.143650] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 02/10/2021] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Beige and brown adipose tissue (BAT) are associated with improved metabolic homeostasis. We recently reported that the β3-adrenergic receptor agonist mirabegron induced beige adipose tissue in obese insulin-resistant subjects, and this was accompanied by improved glucose metabolism. Here we evaluated pioglitazone treatment with a combination pioglitazone and mirabegron treatment and compared these with previously published data evaluating mirabegron treatment alone. Both drugs were used at FDA-approved dosages. METHODS We measured BAT by PET CT scans, measured beige adipose tissue by immunohistochemistry, and comprehensively characterized glucose and lipid homeostasis and insulin sensitivity by euglycemic clamp and oral glucose tolerance tests. Subcutaneous white adipose tissue, muscle fiber type composition and capillary density, lipotoxicity, and systemic inflammation were evaluated by immunohistochemistry, gene expression profiling, mass spectroscopy, and ELISAs. RESULTS Treatment with pioglitazone or the combination of pioglitazone and mirabegron increased beige adipose tissue protein marker expression and improved insulin sensitivity and glucose homeostasis, but neither treatment induced BAT in these obese subjects. When the magnitude of the responses to the treatments was evaluated, mirabegron was found to be the most effective at inducing beige adipose tissue. Although monotherapy with either mirabegron or pioglitazone induced adipose beiging, combination treatment resulted in less beiging than either alone. The 3 treatments also had different effects on muscle fiber type switching and capillary density. CONCLUSION The addition of pioglitazone to mirabegron treatment does not enhance beiging or increase BAT in obese insulin-resistant research participants. TRIAL REGISTRATION ClinicalTrials.gov NCT02919176. FUNDING NIH DK112282 and P20GM103527 and Clinical and Translational Science Awards grant UL1TR001998.
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Affiliation(s)
- Brian S Finlin
- Division of Endocrinology, Department of Internal Medicine, College of Medicine.,Barnstable Brown Diabetes and Obesity Center
| | - Hasiyet Memetimin
- Division of Endocrinology, Department of Internal Medicine, College of Medicine.,Barnstable Brown Diabetes and Obesity Center
| | - Beibei Zhu
- Division of Endocrinology, Department of Internal Medicine, College of Medicine.,Barnstable Brown Diabetes and Obesity Center
| | - Amy L Confides
- Department of Physical Therapy and Center for Muscle Biology, College of Health Sciences
| | | | | | - Zachary R Johnson
- Division of Endocrinology, Department of Internal Medicine, College of Medicine
| | | | - Jianzhong Chen
- Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, University of Kentucky, Lexington, Kentucky, USA.,Lexington Veterans Affairs Medical Center, Lexington, Kentucky, USA
| | - Andrew J Morris
- Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, University of Kentucky, Lexington, Kentucky, USA.,Lexington Veterans Affairs Medical Center, Lexington, Kentucky, USA
| | | | | | - Philip A Kern
- Division of Endocrinology, Department of Internal Medicine, College of Medicine.,Barnstable Brown Diabetes and Obesity Center
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186
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Li H, Wang F, Yang M, Sun J, Zhao Y, Tang D. The Effect of Irisin as a Metabolic Regulator and Its Therapeutic Potential for Obesity. Int J Endocrinol 2021; 2021:6572342. [PMID: 33790964 PMCID: PMC7997758 DOI: 10.1155/2021/6572342] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 01/05/2021] [Accepted: 03/03/2021] [Indexed: 12/13/2022] Open
Abstract
Obesity is a worldwide health problem due to the imbalance of energy intake and energy expenditure. Irisin, a newly identified exercise-responsive myokine, which is produced by the proteolytic cleavage of fibronectin type III domain-containing protein 5 (FNDC5), has emerged as a promising therapeutic strategy to combat obesity and obesity-related complications. Various studies in mice have shown that irisin could respond to systematic exercise training and promote white-to-brown fat transdifferentiation, but the role and function of irisin in humans are controversial. In this review, we systematically introduced and analyzed the factors that may contribute to these inconsistent results. Furthermore, we also described the potential anti-inflammatory properties of irisin under a variety of inflammatory conditions. Finally, the review discussed the existing unresolved issues and controversies about irisin, including the transcription of the irisin precursor FNDC5 gene in humans, the cleavage site of the yet unknown proteolytic enzyme that cleaves irisin from FNDC5, and the reliability of irisin levels measured with available detection methods.
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Affiliation(s)
- Hui Li
- Center for Gene and Immunotherapy, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China
| | - Fang Wang
- Institute of Medical Sciences, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China
| | - Mu Yang
- Center for Gene and Immunotherapy, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China
| | - Jiao Sun
- Center for Gene and Immunotherapy, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China
| | - Yi Zhao
- Center for Gene and Immunotherapy, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China
| | - Dongqi Tang
- Center for Gene and Immunotherapy, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China
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187
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Fischer AW, Jaeckstein MY, Gottschling K, Heine M, Sass F, Mangels N, Schlein C, Worthmann A, Bruns OT, Yuan Y, Zhu H, Chen O, Ittrich H, Nilsson SK, Stefanicka P, Ukropec J, Balaz M, Dong H, Sun W, Reimer R, Scheja L, Heeren J. Lysosomal lipoprotein processing in endothelial cells stimulates adipose tissue thermogenic adaptation. Cell Metab 2021; 33:547-564.e7. [PMID: 33357458 DOI: 10.1016/j.cmet.2020.12.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 10/02/2020] [Accepted: 11/30/2020] [Indexed: 12/13/2022]
Abstract
In response to cold exposure, thermogenic adipocytes internalize large amounts of fatty acids after lipoprotein lipase-mediated hydrolysis of triglyceride-rich lipoproteins (TRL) in the capillary lumen of brown adipose tissue (BAT) and white adipose tissue (WAT). Here, we show that in cold-exposed mice, vascular endothelial cells in adipose tissues endocytose substantial amounts of entire TRL particles. These lipoproteins subsequently follow the endosomal-lysosomal pathway, where they undergo lysosomal acid lipase (LAL)-mediated processing. Endothelial cell-specific LAL deficiency results in impaired thermogenic capacity as a consequence of reduced recruitment of brown and brite/beige adipocytes. Mechanistically, TRL processing by LAL induces proliferation of endothelial cells and adipocyte precursors via beta-oxidation-dependent production of reactive oxygen species, which in turn stimulates hypoxia-inducible factor-1α-dependent proliferative responses. In conclusion, this study demonstrates a physiological role for TRL particle uptake into BAT and WAT and establishes endothelial lipoprotein processing as an important determinant of adipose tissue remodeling during thermogenic adaptation.
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Affiliation(s)
- Alexander W Fischer
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Department of Molecular Metabolism, Harvard T. H. Chan School of Public Health, Boston, MA, USA; Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Michelle Y Jaeckstein
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Kristina Gottschling
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Markus Heine
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Frederike Sass
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Nils Mangels
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Schlein
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Anna Worthmann
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Oliver T Bruns
- Helmholtz Pioneer Campus, Helmholtz Zentrum München, Neuherberg, Germany
| | - Yucheng Yuan
- Department of Chemistry, Brown University, Providence, RI, USA
| | - Hua Zhu
- Department of Chemistry, Brown University, Providence, RI, USA
| | - Ou Chen
- Department of Chemistry, Brown University, Providence, RI, USA
| | - Harald Ittrich
- Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Stefan K Nilsson
- Department of Medical Biosciences, Umeå University, Umeå, Sweden
| | - Patrik Stefanicka
- Department of Otorhinolaryngology - Head and Neck Surgery, Comenius University, Bratislava, Slovakia
| | - Jozef Ukropec
- Institute of Experimental Endocrinology, Biomedical Research Center at the Slovak Academy of Sciences, Bratislava, Slovakia
| | - Miroslav Balaz
- Institute of Food, Nutrition and Health, ETH Zürich, Schwerzenbach, Switzerland
| | - Hua Dong
- Institute of Food, Nutrition and Health, ETH Zürich, Schwerzenbach, Switzerland
| | - Wenfei Sun
- Institute of Food, Nutrition and Health, ETH Zürich, Schwerzenbach, Switzerland
| | - Rudolf Reimer
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
| | - Ludger Scheja
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Joerg Heeren
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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188
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In vivo emergence of beige-like fat in chickens as physiological adaptation to cold environments. Amino Acids 2021; 53:381-393. [PMID: 33598768 PMCID: PMC7979618 DOI: 10.1007/s00726-021-02953-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Accepted: 02/02/2021] [Indexed: 12/19/2022]
Abstract
While it has been hypothesized that brown adipocytes responsible for mammalian thermogenesis are absent in birds, the existence of beige fat has yet to be studied directly. The present study tests the hypothesis that beige fat emerges in birds as a mechanism of physiological adaptation to cold environments. Subcutaneous neck adipose tissue from cold-acclimated or triiodothyronine (T3)-treated chickens exhibited increases in the expression of avian uncoupling protein (avUCP, an ortholog of mammalian UCP2 and UCP3) gene and some known mammalian beige adipocyte-specific markers. Morphological characteristics of white adipose tissues of treated chickens showed increased numbers of both small and larger clusters of multilocular fat cells within the tissues. Increases in protein levels of avUCP and mitochondrial marker protein, voltage-dependent anion channel, and immunohistochemical analysis for subcutaneous neck fat revealed the presence of potentially thermogenic mitochondria-rich cells. This is the first evidence that the capacity for thermogenesis may be acquired by differentiating adipose tissue into beige-like fat for maintaining temperature homeostasis in the subcutaneous fat 'neck warmer' in chickens exposed to a cold environment.
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189
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Siannoto M, Nugraha GI, Lesmana R, Goenawan H, Tarawan VM, Khairani AF. The Nutraceuticals and White Adipose Tissue in Browning Process. CURRENT NUTRITION & FOOD SCIENCE 2021. [DOI: 10.2174/1573401316999200731004318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Obesity has become a prominent epidemic disease since its worldwide prevalence has
shown a continuous rise over the past few decades. The primary aim of obesity treatment is to effectively
reduce the intake of energy, while simultaneously increasing energy expenditure. Increasing
thermogenesis is one of the methods to increase energy expenditure. Thermogenesis, which primarily
occurs in brown adipose tissue, can also be produced by beige adipose tissue, through a process
known as browning. The browning process has recently been attracting a great deal of attention as
a potential anti-obesity agent. Many well-researched inducers of the browning process are readily
available, including cold exposure, agonist β3-adrenergic, agonist peroxisome proliferator activated
receptor γ, fibroblast growth factor 21, irisin and several nutraceuticals (including resveratrol,
curcumin, quercetin, fish oils, green tea, etc.). This mini review summarizes the current knowledge
and the latest research of some nutraceuticals that are potentially involved in the browning process.
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Affiliation(s)
- Melisa Siannoto
- Graduate Program of Antiaging and Aesthetics Medicine, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Gaga I. Nugraha
- Division of Biochemistry and Biomolecular, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Ronny Lesmana
- Physiology Division, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Hanna Goenawan
- Physiology Division, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Vita M. Tarawan
- Physiology Division, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Astrid F. Khairani
- Graduate Program of Antiaging and Aesthetics Medicine, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
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190
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Van Schaik L, Kettle C, Green R, Irving HR, Rathner JA. Effects of Caffeine on Brown Adipose Tissue Thermogenesis and Metabolic Homeostasis: A Review. Front Neurosci 2021; 15:621356. [PMID: 33613184 PMCID: PMC7889509 DOI: 10.3389/fnins.2021.621356] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 01/11/2021] [Indexed: 12/11/2022] Open
Abstract
The impact of brown adipose tissue (BAT) metabolism on understanding energy balance in humans is a relatively new and exciting field of research. The pathogenesis of obesity can be largely explained by an imbalance between caloric intake and energy expenditure, but the underlying mechanisms are far more complex. Traditional non-selective sympathetic activators have been used to artificially elevate energy utilization, or suppress appetite, however undesirable side effects are apparent with the use of these pharmacological interventions. Understanding the role of BAT, in relation to human energy homeostasis has the potential to dramatically offset the energy imbalance associated with obesity. This review discusses paradoxical effects of caffeine on peripheral adenosine receptors and the possible role of adenosine in increasing metabolism is highlighted, with consideration to the potential of central rather than peripheral mechanisms for caffeine mediated BAT thermogenesis and energy expenditure. Research on the complex physiology of adipose tissue, the embryonic lineage and function of the different types of adipocytes is summarized. In addition, the effect of BAT on overall human metabolism and the extent of the associated increase in energy expenditure are discussed. The controversy surrounding the primary β-adrenoceptor involved in human BAT activation is examined, and suggestions as to the lack of translational findings from animal to human physiology and human in vitro to in vivo models are provided. This review compares and distinguishes human and rodent BAT effects, thus developing an understanding of human BAT thermogenesis to aid lifestyle interventions targeting obesity and metabolic syndrome. The focus of this review is on the effect of BAT thermogenesis on overall metabolism, and the potential therapeutic effects of caffeine in increasing metabolism via its effects on BAT.
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Affiliation(s)
- Lachlan Van Schaik
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, VIC, Australia
| | - Christine Kettle
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, VIC, Australia
| | - Rodney Green
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, VIC, Australia
| | - Helen R. Irving
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, VIC, Australia
| | - Joseph A. Rathner
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, VIC, Australia
- Department of Physiology, School of Biomedical Sciences, The University of Melbourne, Melbourne, VIC, Australia
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191
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Ahmad B, Vohra MS, Saleemi MA, Serpell CJ, Fong IL, Wong EH. Brown/Beige adipose tissues and the emerging role of their secretory factors in improving metabolic health: The batokines. Biochimie 2021; 184:26-39. [PMID: 33548390 DOI: 10.1016/j.biochi.2021.01.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/22/2020] [Accepted: 01/28/2021] [Indexed: 12/12/2022]
Abstract
Brown and beige adipose tissues are the primary sites for adaptive non-shivering thermogenesis. Although they have been known principally for their thermogenic effects, in recent years, it has emerged that, just like white adipose tissue (WAT), brown and beige adipose tissues also play an important role in the regulation of metabolic health through secretion of various brown adipokines (batokines) in response to various physiological cues. These secreted batokines target distant organs and tissues such as the liver, heart, skeletal muscles, brain, WAT, and perform various local and systemic functions in an autocrine, paracrine, or endocrine manner. Brown and beige adipose tissues are therefore now receiving increasing levels of attention with respect to their effects on various other organs and tissues. Identification of novel secreted factors by these tissues may help in the discovery of drug candidates for the treatment of various metabolic disorders such as obesity, type-2 diabetes, skeletal deformities, cardiovascular diseases, dyslipidemia. In this review, we comprehensively describe the emerging secretory role of brown/beige adipose tissues and the metabolic effects of various brown/beige adipose tissues secreted factors on other organs and tissues in endocrine/paracrine manners, and as well as on brown/beige adipose tissue itself in an autocrine manner. This will provide insights into understanding the potential secretory role of brown/beige adipose tissues in improving metabolic health.
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Affiliation(s)
- Bilal Ahmad
- School of Biosciences, Faculty of Health and Medical Sciences, Taylor's University Lakeside Campus, Subang Jaya, 47500, Malaysia
| | - Muhammad Sufyan Vohra
- School of Medicine, Faculty of Health and Medical Sciences, Taylor's University Lakeside Campus, Subang Jaya, 47500, Malaysia
| | - Mansab Ali Saleemi
- School of Biosciences, Faculty of Health and Medical Sciences, Taylor's University Lakeside Campus, Subang Jaya, 47500, Malaysia
| | - Christopher J Serpell
- School of Physical Sciences, Ingram Building, University of Kent, Canterbury, Kent, CT2 7NH, United Kingdom
| | - Isabel Lim Fong
- Department of Paraclinical Sciences, Faculty of Medicine and Health Sciences Universiti Malaysia Sarawak (UNIMAS), Kota Samarahan, Sarawak, 94300, Malaysia
| | - Eng Hwa Wong
- School of Medicine, Faculty of Health and Medical Sciences, Taylor's University Lakeside Campus, Subang Jaya, 47500, Malaysia.
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192
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Brown Adipose Tissue and Its Role in Insulin and Glucose Homeostasis. Int J Mol Sci 2021; 22:ijms22041530. [PMID: 33546400 PMCID: PMC7913527 DOI: 10.3390/ijms22041530] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/21/2021] [Accepted: 02/01/2021] [Indexed: 12/15/2022] Open
Abstract
The increased worldwide prevalence of obesity, insulin resistance, and their related metabolic complications have prompted the scientific world to search for new possibilities to combat obesity. Brown adipose tissue (BAT), due to its unique protein uncoupling protein 1 (UPC1) in the inner membrane of the mitochondria, has been acknowledged as a promising approach to increase energy expenditure. Activated brown adipocytes dissipate energy, resulting in heat production. In other words, BAT burns fat and increases the metabolic rate, promoting a negative energy balance. Moreover, BAT alleviates metabolic complications like dyslipidemia, impaired insulin secretion, and insulin resistance in type 2 diabetes. The aim of this review is to explore the role of BAT in total energy expenditure, as well as lipid and glucose homeostasis, and to discuss new possible activators of brown adipose tissue in humans to treat obesity and metabolic disorders.
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193
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Wang L, Luo Y, Luo L, Wu D, Ding X, Zheng H, Wu H, Liu B, Yang X, Silva F, Wang C, Zhang X, Zheng X, Chen J, Brigman J, Mandell M, Zhou Z, Liu F, Yang XO, Liu M. Adiponectin restrains ILC2 activation by AMPK-mediated feedback inhibition of IL-33 signaling. J Exp Med 2021; 218:e20191054. [PMID: 33104171 PMCID: PMC7590510 DOI: 10.1084/jem.20191054] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 10/20/2019] [Accepted: 09/01/2020] [Indexed: 12/11/2022] Open
Abstract
ILC2s are present in adipose tissue and play a critical role in regulating adipose thermogenesis. However, the mechanisms underlying the activation of adipose-resident ILC2s remain poorly defined. Here, we show that IL-33, a potent ILC2 activator, stimulates phosphorylation of AMPK at Thr172 via TAK1 in primary ILC2s, which provides a feedback mechanism to inhibit IL-33-induced NF-κB activation and IL-13 production. Treating ILC2s with adiponectin or an adiponectin receptor agonist (AdipoRon) activated AMPK and decreased IL-33-NF-κB signaling. AdipoRon also suppressed cold-induced thermogenic gene expression and energy expenditure in vivo. In contrast, adiponectin deficiency increased the ILC2 fraction and activation, leading to up-regulated thermogenic gene expression in adipose tissue of cold-exposed mice. ILC2 deficiency or blocking ILC2 function by neutralization of the IL-33 receptor with anti-ST2 diminished the suppressive effect of adiponectin on cold-induced adipose thermogenesis and energy expenditure. Taken together, our study reveals that adiponectin is a negative regulator of ILC2 function in adipose tissue via AMPK-mediated negative regulation of IL-33 signaling.
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Affiliation(s)
- Lu Wang
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
- Department of Psychiatry, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yan Luo
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
- Department of Endocrinology and Metabolism, National Clinical Research Center for Metabolic Diseases, Metabolic Syndrome Research Center, Key Laboratory of Diabetes Immunology, Central South University, Changsha, Hunan, China
| | - Liping Luo
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Dandan Wu
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
- Department of Microbiology and Molecular Genetics, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Xiaofeng Ding
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Handong Zheng
- Department of Microbiology and Molecular Genetics, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Haisha Wu
- Department of Psychiatry, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Bilian Liu
- Department of Endocrinology and Metabolism, National Clinical Research Center for Metabolic Diseases, Metabolic Syndrome Research Center, Key Laboratory of Diabetes Immunology, Central South University, Changsha, Hunan, China
| | - Xin Yang
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Floyd Silva
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Chunqing Wang
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Xing Zhang
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Xianyun Zheng
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Jindong Chen
- Department of Psychiatry, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jonathan Brigman
- Department of Neuroscience, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Michael Mandell
- Department of Microbiology and Molecular Genetics, University of New Mexico Health Sciences Center, Albuquerque, NM
- Autophagy, Inflammation and Metabolism Center for Biomedical Research Excellence, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Zhiguang Zhou
- Department of Endocrinology and Metabolism, National Clinical Research Center for Metabolic Diseases, Metabolic Syndrome Research Center, Key Laboratory of Diabetes Immunology, Central South University, Changsha, Hunan, China
| | - Feng Liu
- Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX
| | - Xuexian O. Yang
- Department of Microbiology and Molecular Genetics, University of New Mexico Health Sciences Center, Albuquerque, NM
- Autophagy, Inflammation and Metabolism Center for Biomedical Research Excellence, University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Meilian Liu
- Department of Biochemistry and Molecular Biology, University of New Mexico Health Sciences Center, Albuquerque, NM
- Autophagy, Inflammation and Metabolism Center for Biomedical Research Excellence, University of New Mexico Health Sciences Center, Albuquerque, NM
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194
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Wang H, Willershäuser M, Li Y, Fromme T, Schnabl K, Bast-Habersbrunner A, Ramisch S, Mocek S, Klingenspor M. Uncoupling protein-1 expression does not protect mice from diet-induced obesity. Am J Physiol Endocrinol Metab 2021; 320:E333-E345. [PMID: 33252252 PMCID: PMC8260371 DOI: 10.1152/ajpendo.00285.2020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We studied the metabolic phenotype of a novel Ucp1-LUC-iRFP713 knock-in reporter gene mouse model originally generated to monitor endogenous Ucp1 gene expression. Both reporter mice and reporter cells reliably reflected Ucp1 gene expression in vivo and in vitro. We here report an unexpected reduction in UCP1 content in homozygous knock-in (KI) reporter mice. As a result, the thermogenic capacity of KI mice stimulated by norepinephrine was largely blunted, making them more sensitive to an acute cold exposure. In return, these reporter mice with reduced UCP1 expression enabled us to investigate the physiological role of UCP1 in the prevention of weight gain. We observed no substantial differences in body mass across the three genotypes, irrespective of the type of diet or the ambient temperature, possibly due to the insufficient UCP1 activation. Indeed, activation of UCP1 by daily injection of the selective β3-adrenergic receptor agonist CL316,243 resulted in significantly greater reduction of body weight in wild-type mice than in KI mice. Taken together, we conclude that the intact expression of UCP1 is essential for cold-induced thermogenesis but the presence of UCP1 per se does not protect mice from diet-induced obesity.NEW & NOTEWORTHY To study the functional role of UCP1-dependent brown adipose tissue thermogenesis for energy balance, new animal models are needed. By metabolic phenotyping of a novel mouse model with low UCP1 levels in brown fat, we demonstrate that the susceptibility to diet-induced obesity is not increased despite impaired cold-induced thermogenic capacity. Brown fat requires pharmacological activation to promote negative energy balance in diet-induced obese mice.
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Affiliation(s)
- Hui Wang
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Monja Willershäuser
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Yongguo Li
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Tobias Fromme
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Katharina Schnabl
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Andrea Bast-Habersbrunner
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Samira Ramisch
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Sabine Mocek
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Martin Klingenspor
- Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Freising, Germany
- Chair for Molecular Nutritional Medicine, Technical University of Munich, Freising, Germany
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195
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Chatree S, Sitticharoon C, Maikaew P, Pongwattanapakin K, Keadkraichaiwat I, Churintaraphan M, Sripong C, Sririwichitchai R, Tapechum S. Cissus Quadrangularis enhances UCP1 mRNA, indicative of white adipocyte browning and decreases central obesity in humans in a randomized trial. Sci Rep 2021; 11:2008. [PMID: 33479386 PMCID: PMC7820492 DOI: 10.1038/s41598-021-81606-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 01/08/2021] [Indexed: 01/08/2023] Open
Abstract
Obesity is associated with the growth and expansion of adipocytes which could be decreased via several mechanisms. Cissus Quadrangularis (CQ) extract has been shown to reduce obesity in humans; however, its effect on human white adipocytes (hWA) has not been elucidated. This study aimed to investigate the effects of CQ on obesity, lipolysis, and browning of hWA. CQ treatment in obese humans significantly decreased waist circumference at week 4 and week 8 when compared with the baseline values (p < 0.05 all) and significantly decreased hip circumference at week 8 when compared with the baseline and week 4 values (p < 0.05 all). Serum leptin levels of the CQ-treated group were significantly higher at week 8 compared to baseline levels (p < 0.05). In hWA, glycerol release was reduced in the CQ-treated group when compared with the vehicle-treated group. In the browning experiment, pioglitazone, the PPAR-γ agonist, increased UCP1 mRNA when compared to vehicle (p < 0.01). Interestingly, 10, 100, and 1000 ng/ml CQ extract treatment on hWA significantly enhanced UCP1 expression in a dose-dependent manner when compared to pioglitazone treatment (p < 0.001 all). In conclusion, CQ decreased waist and hip circumferences in obese humans and enhanced UCP1 mRNA in hWA suggestive of its action via browning of hWA.
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Affiliation(s)
- Saimai Chatree
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand
| | - Chantacha Sitticharoon
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand.
| | - Pailin Maikaew
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand
| | - Kitchaya Pongwattanapakin
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand
| | - Issarawan Keadkraichaiwat
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand
| | - Malika Churintaraphan
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand
| | - Chanakarn Sripong
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand
| | - Rungnapa Sririwichitchai
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand
| | - Sompol Tapechum
- Department of Physiology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Rd., Siriraj, Bangkoknoi, Bangkok, 10700, Thailand
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196
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Distinct Shades of Adipocytes Control the Metabolic Roles of Adipose Tissues: From Their Origins to Their Relevance for Medical Applications. Biomedicines 2021; 9:biomedicines9010040. [PMID: 33466493 PMCID: PMC7824911 DOI: 10.3390/biomedicines9010040] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/20/2020] [Accepted: 12/22/2020] [Indexed: 12/17/2022] Open
Abstract
Adipose tissue resides in specific depots scattered in peripheral or deeper locations all over the body and it enwraps most of the organs. This tissue is always in a dynamic evolution as it must adapt to the metabolic demand and constraints. It exhibits also endocrine functions important to regulate energy homeostasis. This complex organ is composed of depots able to produce opposite functions to monitor energy: the so called white adipose tissue acts to store energy as triglycerides preventing ectopic fat deposition while the brown adipose depots dissipate it. It is composed of many cell types. Different types of adipocytes constitute the mature cells specialized to store or burn energy. Immature adipose progenitors (AP) presenting stem cells properties contribute not only to the maintenance but also to the expansion of this tissue as observed in overweight or obese individuals. They display a high regeneration potential offering a great interest for cell therapy. In this review, we will depict the attributes of the distinct types of adipocytes and their contribution to the function and metabolic features of adipose tissue. We will examine the specific role and properties of distinct depots according to their location. We will consider their cellular heterogeneity to present an updated picture of this sophisticated tissue. We will also introduce new trends pointing out a rational targeting of adipose tissue for medical applications.
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197
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Gjorgova-Gjeorgjievski S, Fritchie K, Folpe AL. CD10 (neprilysin) expression: a potential adjunct in the distinction of hibernoma from morphologic mimics. Hum Pathol 2021; 110:12-19. [PMID: 33406387 DOI: 10.1016/j.humpath.2020.12.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/22/2020] [Accepted: 12/24/2020] [Indexed: 11/28/2022]
Abstract
Although the morphologic diagnosis of hibernoma is usually straightforward, some hibernomas have atypical morphologic features, mimicking atypical lipomatous tumors/well-differentiated liposarcomas (ALT/WDLs). In addition, the multivacuolated brown fat cells may be mistaken for lipoblasts by pathologists, especially those without significant soft tissue tumor exposure. Thus, we continue to receive in consultation cases of hibernoma sent for MDM2 fluorescence in situ hybridization testing to exclude ALT/WDL. Testing hibernomas for MDM2 amplification, however, adds cost and delays the final diagnosis. Recently, we have noted expression of neprilysin (CD10, CALLA), a zinc-dependent metalloproteinase involved in the inactivation of various peptide hormones, in brown fat cells, and wished to explore the potential utility of this widely available, inexpensive ancillary test in the differential diagnosis of hibernoma. Formalin-fixed, paraffin-embedded tissue sections from well-characterized cases of hibernoma (n = 48), brown fat (n = 21), ALTs/WDLs (n = 17), pleomorphic liposarcomas (PLPSs) (n = 6), lipomas (n = 5), and fat necrosis (n = 5) were immunostained for CD10, using a commercially available antibody and routine laboratory protocols. CD10 expression was evaluated in both adipocytes and in surrounding stromal cells. The hibernomas occurred in 28 men and 20 women, ranging from 11 to 76 years of age and involved the extremities (n = 25), pelvis (n = 7), abdomen/pelvis/retroperitoneum (n = 7), head and neck region (n = 6), back (n = 2), and chest (n = 1). All showed diffuse, strong CD10 expression in multivacuolated brown fat cells and in the majority of adjacent univacuolated fat cells. Brown adipose tissue from various anatomic structures showed an identical pattern of immunoreactivity. In contrast, CD10 expression was present in the adipocytes of only 3 of 17 (18%) ALTs/WDLs and was absent in lipomas and fat necrosis. Lipoblasts expressed CD10 in 3 PLPSs. Expression of CD10 by surrounding fibroblastic stromal cells was more widespread, present in 13 hibernomas, 10 ALTs/WDLs, 1 instance of fat necrosis, 6 PLPSs, and 4 examples of brown fat. We conclude that immunohistochemistry for CD10 may represent a useful, rapid and inexpensive ancillary test in the differential diagnosis of hibernoma from potential morphologic mimics, especially when morphologic features favor hibernoma. CD10 expression in adipocytes, however, should be rigorously distinguished from fibroblastic stromal cell CD10 expression, a nonspecific finding.
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Affiliation(s)
| | - Karen Fritchie
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Andrew L Folpe
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA.
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198
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Lesmana R, Siannoto M, Nugraha GI, Goenawan H, Feinisa AK, Pratiwi YS, Veronica F, Tarawan VM, Susianti S, Supratman U. Nutmeg extract potentially alters characteristics of white adipose tissue in rats. Vet Med Sci 2021; 7:512-520. [PMID: 33389818 PMCID: PMC8025630 DOI: 10.1002/vms3.383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 08/28/2020] [Accepted: 10/06/2020] [Indexed: 01/25/2023] Open
Abstract
Background Browning of white adipose tissue (WAT) is a promising approach to obesity treatment. During browning, WAT transforms into beige adipose tissue through stimulation of the peroxisome proliferator activated receptor γ (PPARγ). Nutmeg, one of the Indonesian herbs, reportedly has dual roles as a PPARα/γ partial agonist. Even though nutmeg has been traditionally used in body weight reduction, there is limited information regarding the potential role of nutmeg in browning of WAT. Objectives In this study, we explored the effect of nutmeg seed extract (NuSE) as a potential inductor of WAT browning. Methods Twelve male Wistar rats, 5–6 weeks old, were divided into control and nutmeg groups. The rats in nutmeg group were given NuSE for 12 weeks by oral gavage. After 12 weeks, the rat's inguinal WAT and brown adipose tissue (BAT) were collected, weighed and stored at − 80°C until use. Results We observed that even though NuSE did not reduce the final body weight, it significantly reduced body weight gain. NuSE also increased protein levels of peroxisome proliferator activated receptor γ coactivator 1α (PGC‐1α) and uncoupling protein 3 (UCP3) significantly and tended to increase UCP2 and UCP1 levels. Furthermore, NuSE induced macroscopic and microscopic morphological changes of inguinal WAT, marked by significantly increased adipocyte numbers and decreased adipocyte size. Conclusions Even though NuSE did not increase UCP1 significantly, it potentially alters inguinal WAT characteristics and leads to browning through PGC‐1α and UCP3 induction. However, UCP3’s specific mechanism in WAT browning remains unclear. Our findings could contribute to obesity treatment in the future.
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Affiliation(s)
- Ronny Lesmana
- Physiology Division, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, West Java, Indonesia.,Biological Activity Division, Central Laboratory, Universitas Padjadjaran, Bandung, West Java, Indonesia.,Center of Excellence in Higher Education for Pharmaceutical Care Innovation, Universitas Padjadjaran, Bandung, West Java, Indonesia
| | - Melisa Siannoto
- Graduate Program of Anti Aging and Aesthetics Medicine, Faculty of Medicine, Universitas Padjadjaran, Bandung, West Java, Indonesia
| | - Gaga I Nugraha
- Division of Biochemistry and Biomolecular, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, West Java, Indonesia
| | - Hanna Goenawan
- Physiology Division, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, West Java, Indonesia.,Biological Activity Division, Central Laboratory, Universitas Padjadjaran, Bandung, West Java, Indonesia
| | - Astrid K Feinisa
- Graduate Program of Anti Aging and Aesthetics Medicine, Faculty of Medicine, Universitas Padjadjaran, Bandung, West Java, Indonesia.,Division of Cell Biology, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjajaran, Bandung, West Java, Indonesia
| | - Yuni S Pratiwi
- Physiology Division, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, West Java, Indonesia.,Biological Activity Division, Central Laboratory, Universitas Padjadjaran, Bandung, West Java, Indonesia
| | - Fifi Veronica
- Anatomy Division, Department of Biomedical Sciences, Faculty of Medicine, University of Padjadjaran, Bandung, West Java, Indonesia
| | - Vita M Tarawan
- Physiology Division, Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, West Java, Indonesia
| | - Susianti Susianti
- Center of Excellence in Higher Education for Pharmaceutical Care Innovation, Universitas Padjadjaran, Bandung, West Java, Indonesia.,Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Bandung, West Java, Indonesia
| | - Unang Supratman
- Center of Excellence in Higher Education for Pharmaceutical Care Innovation, Universitas Padjadjaran, Bandung, West Java, Indonesia.,Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Bandung, West Java, Indonesia
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199
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Pervin S, Reddy ST, Singh R. Novel Roles of Follistatin/Myostatin in Transforming Growth Factor-β Signaling and Adipose Browning: Potential for Therapeutic Intervention in Obesity Related Metabolic Disorders. Front Endocrinol (Lausanne) 2021; 12:653179. [PMID: 33897620 PMCID: PMC8062757 DOI: 10.3389/fendo.2021.653179] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 03/19/2021] [Indexed: 12/12/2022] Open
Abstract
Obesity is a global health problem and a major risk factor for several metabolic conditions including dyslipidemia, diabetes, insulin resistance and cardiovascular diseases. Obesity develops from chronic imbalance between energy intake and energy expenditure. Stimulation of cellular energy burning process has the potential to dissipate excess calories in the form of heat via the activation of uncoupling protein-1 (UCP1) in white and brown adipose tissues. Recent studies have shown that activation of transforming growth factor-β (TGF-β) signaling pathway significantly contributes to the development of obesity, and blockade or inhibition is reported to protect from obesity by promoting white adipose browning and increasing mitochondrial biogenesis. Identification of novel compounds that activate beige/brown adipose characteristics to burn surplus calories and reduce excess storage of fat are actively sought in the fight against obesity. In this review, we present recent developments in our understanding of key modulators of TGF-β signaling pathways including follistatin (FST) and myostatin (MST) in regulating adipose browning and brown adipose mass and activity. While MST is a key ligand for TGF-β family, FST can bind and regulate biological activity of several TGF-β superfamily members including activins, bone morphogenic proteins (BMP) and inhibins. Here, we review the literature supporting the critical roles for FST, MST and other proteins in modulating TGF-β signaling to influence beige and brown adipose characteristics. We further review the potential therapeutic utility of FST for the treatment of obesity and related metabolic disorders.
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Affiliation(s)
- Shehla Pervin
- Department of Obstetrics and Gynecology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, United States
- Division of Endocrinology and Metabolism, Charles R. Drew University of Medicine and Science, Los Angeles, CA, United States
| | - Srinivasa T. Reddy
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- Department of Medicine, Division of Cardiology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, United States
| | - Rajan Singh
- Department of Obstetrics and Gynecology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, United States
- Division of Endocrinology and Metabolism, Charles R. Drew University of Medicine and Science, Los Angeles, CA, United States
- Department of Endocrinology, Men’s Health: Aging and Metabolism, Brigham and Women’s Hospital, Boston, MA, United States
- *Correspondence: Rajan Singh,
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200
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Lopes H, Egan B. Visceral adiposity syndrome and cardiometabolism. SCRIPTA MEDICA 2021. [DOI: 10.5937/scriptamed52-32717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
The distribution of fat in the human body is related to hemodynamic and metabolic homeostasis. Brown fat is inversely related to body mass index and is associated with a lower probability of developing diabetes. Beige adipose tissue shares some functional characteristics with brown adipose tissue. White adipose tissue constitutes the majority of the fatty tissue and is mainly distributed in the subcutaneous and abdominal cavity. Intra-abdominal white fat has gained prominence in recent years for its association with cardiovascular risk factors and higher cardiovascular mortality. This review article discusses the human adaptation in the environment, a sympathovagal and hypothalamic-pituitary-adrenal imbalance as a possible cause of increased visceral adiposity and its consequences on cardiometabolism.
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