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Kagdi S, Lyons SA, Beaudry JL. The interplay of glucose-dependent insulinotropic polypeptide in adipose tissue. J Endocrinol 2024; 261:e230361. [PMID: 38579777 PMCID: PMC11103678 DOI: 10.1530/joe-23-0361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 04/03/2024] [Indexed: 04/07/2024]
Abstract
Adipose tissue was once known as a reservoir for energy storage but is now considered a crucial organ for hormone and energy flux with important effects on health and disease. Glucose-dependent insulinotropic polypeptide (GIP) is an incretin hormone secreted from the small intestinal K cells, responsible for augmenting insulin release, and has gained attention for its independent and amicable effects with glucagon-like peptide 1 (GLP-1), another incretin hormone secreted from the small intestinal L cells. The GIP receptor (GIPR) is found in whole adipose tissue, whereas the GLP-1 receptor (GLP-1R) is not, and some studies suggest that GIPR action lowers body weight and plays a role in lipolysis, glucose/lipid uptake/disposal, adipose tissue blood flow, lipid oxidation, and free-fatty acid (FFA) re-esterification, which may or may not be influenced by other hormones such as insulin. This review summarizes the research on the effects of GIP in adipose tissue (distinct depots of white and brown) using cellular, rodent, and human models. In doing so, we explore the mechanisms of GIPR-based medications for treating metabolic disorders, such as type 2 diabetes and obesity, and how GIPR agonism and antagonism contribute to improvements in metabolic health outcomes, potentially through actions in adipose tissues.
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Affiliation(s)
- Samrin Kagdi
- Department of Nutritional Sciences, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Sulayman A Lyons
- Department of Nutritional Sciences, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Jacqueline L Beaudry
- Department of Nutritional Sciences, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
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2
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Niclou A, Vesi L, Arorae M, Naseri NC, Savusa KF, Naseri T, Young J, Rivara AC, Ocobock C. Indication of mixed glucose and fatty acid use by inferred brown adipose tissue activity in Samoans. Am J Hum Biol 2024; 36:e23998. [PMID: 37823535 PMCID: PMC10939975 DOI: 10.1002/ajhb.23998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 09/11/2023] [Accepted: 09/21/2023] [Indexed: 10/13/2023] Open
Abstract
OBJECTIVES Despite the growing rates of global obesity and the known positive associations between brown adipose tissue (BAT) and cardiovascular health, little is known about the metabolic effects of BAT activity in Samoans, a population at high risk of obesity and type II diabetes. Here we assessed the potential effects of inferred BAT activity on metabolic health markers in Samoan adults exposed to mild cold. METHODS Using point-of-care finger prick technology we measured fasting glucose, total cholesterol, high-density lipoprotein (HDL), and low-density lipoprotein (LDL) levels before and after 30 min of cold exposure among 61 individuals (38 females, 23 males, ages 31-54) from 'Upolu Island, Samoa. Respiratory quotient was measured by indirect calorimetry to determine substrate metabolism at room temperature and cold exposure. RESULTS Fasting glucose levels decreased significantly (p < .001) after cold exposure while neither total cholesterol (p = .88), HDL (p = .312), nor LDL (p = .089) changed. Respiratory quotient decreased significantly (p = .009) between exposures, suggesting an increased preference for lipid metabolism as a response to cold. CONCLUSIONS The observed effects of inferred BAT activity on biomarkers suggest BAT activity utilizes both glucose and lipid-derived fatty acids as fuel for thermogenesis. Our work provides evidence for the beneficial metabolic effects of BAT and emphasizes the need for the population-specific development of metabolic treatments involving BAT to ensure the successful and equitable minimization of extreme consequences of obesity and metabolic health.
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Affiliation(s)
- Alexandra Niclou
- Pennington Biomedical Research Center, Baton Rouge, LA
- Department of Anthropology, University of Notre Dame, Notre Dame, IN
| | - Lupesina Vesi
- Obesity, Lifestyle and Genetic Adaptations (OLaGA) Study Group, Apia, Samoa
| | - Maria Arorae
- Obesity, Lifestyle and Genetic Adaptations (OLaGA) Study Group, Apia, Samoa
| | | | | | | | - Jessica Young
- Center for Social Science Research, University of Notre Dame, Notre Dame, IN
| | - Anna C. Rivara
- Department of Chronic Disease Epidemiology, Yale School of Public Health, New Haven, CT
| | - Cara Ocobock
- Department of Anthropology, University of Notre Dame, Notre Dame, IN
- Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN
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3
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Göger S, Çevirme A. Theory-based obesity intervention program for women: A randomized controlled study. Jpn J Nurs Sci 2024:e12590. [PMID: 38321513 DOI: 10.1111/jjns.12590] [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: 10/23/2023] [Revised: 12/01/2023] [Accepted: 01/13/2024] [Indexed: 02/08/2024]
Abstract
AIMS To determine the effect of the education and counseling intervention given to overweight and obese women according to the theory of planned behavior on their health behaviors. METHODS The study consisted of 78 overweight and obese women in total, between the ages of 18-49. While the women in the intervention group were given a 6-month training program and 6-month counseling service structured according to the theory of planned behavior, the women in the control group were given standard obesity training and were put on hold for 6 months. RESULTS There was a decrease in the post-test anthropometric measurement values of the intervention group compared to the pretest. While there was no statistically significant change in the activity status of the control group over time, the inactivity rate of the intervention group decreased; however, the minimal activity rate increased over time. The post-test healthy life style behaviors scale II health responsibility, physical activity, nutrition, stress management and total scores of the intervention group were higher than those of the control group, and the differences were significant. CONCLUSION It has been determined that the education and counseling services applied to overweight and obese women based on the theory of planned behavior are effective in gaining positive health behaviors.
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Affiliation(s)
- Seda Göger
- Department of Health Care Services, Vocational School of Health Services, Sakarya University, Sakarya, Turkey
| | - Ayşe Çevirme
- Nursing Department, Faculty of Health Sciences, Sakarya University, Sakarya, Turkey
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4
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Chondronikola M, Yoshino J, Ramaswamy R, Giardina JD, Laforest R, Wahl RL, Patterson BW, Mittendorfer B, Klein S. Very-low-density lipoprotein triglyceride and free fatty acid plasma kinetics in women with high or low brown adipose tissue volume and overweight/obesity. Cell Rep Med 2024; 5:101370. [PMID: 38232692 PMCID: PMC10829791 DOI: 10.1016/j.xcrm.2023.101370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 09/18/2023] [Accepted: 12/14/2023] [Indexed: 01/19/2024]
Abstract
Although a high amount of brown adipose tissue (BAT) is associated with low plasma triglyceride concentration, the mechanism responsible for this relationship in people is not clear. Here, we evaluate the interrelationships among BAT, very-low-density lipoprotein triglyceride (VLDL-TG), and free fatty acid (FFA) plasma kinetics during thermoneutrality in women with overweight/obesity who had a low (<20 mL) or high (≥20 mL) volume of cold-activated BAT (assessed by using positron emission tomography in conjunction with 2-deoxy-2-[18F]-fluoro-glucose). We find that plasma TG and FFA concentrations are lower and VLDL-TG and FFA plasma clearance rates are faster in women with high BAT than low BAT volume, whereas VLDL-TG and FFA appearance rates in plasma are not different between the two groups. These findings demonstrate that women with high BAT volume have lower plasma TG and FFA concentrations than women with low BAT volumes because of increased VLDL-TG and FFA clearance rates. This study was registered at ClinicalTrials.gov (NCT02786251).
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Affiliation(s)
- Maria Chondronikola
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, MO, USA; Wellcome-MRC Institute of Metabolic Science-Metabolic Research Laboratories, Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK; Department of Nutritional Sciences and Dietetics, Harokopio University of Athens, Kallithea, Greece.
| | - Jun Yoshino
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, MO, USA
| | - Raja Ramaswamy
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, USA
| | | | - Richard Laforest
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, USA
| | - Richard L Wahl
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, USA
| | - Bruce W Patterson
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, MO, USA
| | - Bettina Mittendorfer
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, MO, USA
| | - Samuel Klein
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, MO, USA; Sansum Diabetes Research Institute, Santa Barbara, CA, USA.
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5
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Oliveras-Cañellas N, Moreno-Navarrete JM, Lorenzo PM, Garrido-Sánchez L, Becerril S, Rangel O, Latorre J, de la Calle Vargas E, Pardo M, Valentí V, Romero-Cabrera JL, Oliva-Olivera W, Silva C, Diéguez C, Villarroya F, López M, Crujeiras AB, Seoane LM, López-Miranda J, Frühbeck G, Tinahones FJ, Fernández-Real JM. Downregulated Adipose Tissue Expression of Browning Genes With Increased Environmental Temperatures. J Clin Endocrinol Metab 2023; 109:e145-e154. [PMID: 37560997 DOI: 10.1210/clinem/dgad469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 07/28/2023] [Accepted: 08/08/2023] [Indexed: 08/11/2023]
Abstract
CONTEXT Climate change and global warming have been hypothesized to influence the increased prevalence of obesity worldwide. However, the evidence is scarce. OBJECTIVE We aimed to investigate how outside temperature might affect adipose tissue physiology and metabolic traits. METHODS The expression of genes involved in thermogenesis/browning and adipogenesis were evaluated (through quantitative polymerase chain reaction) in the subcutaneous adipose tissue (SAT) from 1083 individuals recruited in 5 different regions of Spain (3 in the North and 2 in the South). Plasma biochemical variables and adiponectin (enzyme-linked immunosorbent assay) were collected through standardized protocols. Mean environmental outdoor temperatures were obtained from the National Agency of Meteorology. Univariate, multivariate, and artificial intelligence analyses (Boruta algorithm) were performed. RESULTS The SAT expression of genes associated with browning (UCP1, PRDM16, and CIDEA) and ADIPOQ were significantly and negatively associated with minimum, average, and maximum temperatures. The latter temperatures were also negatively associated with the expression of genes involved in adipogenesis (FASN, SLC2A4, and PLIN1). Decreased SAT expression of UCP1 and ADIPOQ messenger RNA and circulating adiponectin were observed with increasing temperatures in all individuals as a whole and within participants with obesity in univariate, multivariate, and artificial intelligence analyses. The differences remained statistically significant in individuals without type 2 diabetes and in samples collected during winter. CONCLUSION Decreased adipose tissue expression of genes involved in browning and adiponectin with increased environmental temperatures were observed. Given the North-South gradient of obesity prevalence in these same regions, the present observations could have implications for the relationship of the obesity pandemic with global warming.
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Affiliation(s)
- Núria Oliveras-Cañellas
- Department of Diabetes, Endocrinology and Nutrition, Dr. Josep Trueta University Hospital, Girona 17007, Spain
- Nutrition, Eumetabolism and Health Group, Girona Biomedical Research Institute (IDIBGI), Girona 17190, Spain
- Department of Medical Sciences, School of Medicine, University of Girona, Girona 17003, Spain
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
| | - José María Moreno-Navarrete
- Department of Diabetes, Endocrinology and Nutrition, Dr. Josep Trueta University Hospital, Girona 17007, Spain
- Nutrition, Eumetabolism and Health Group, Girona Biomedical Research Institute (IDIBGI), Girona 17190, Spain
- Department of Medical Sciences, School of Medicine, University of Girona, Girona 17003, Spain
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
| | - Paula M Lorenzo
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Epigenomics in Endocinology and Nutrition Group, Epigenomics Unit, Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS/SERGAS), Santiago de Compostela 15706, Spain
| | - Lourdes Garrido-Sánchez
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Servicio de Endocrinología y Nutrición, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Virgen de la Victoria, Universidad de Málaga, Málaga 29590, Spain
| | - Sara Becerril
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Obesity Area, Clínica Universidad de Navarra, University of Navarra, Pamplona 31009, Spain
| | - Oriol Rangel
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Nutrigenomics, Metabolic Syndrome Department, Servicio de Medicina Interna, Hospital Universitario Reina Sofía, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Universidad de Córdoba, Córdoba 14004, Spain
| | - Jèssica Latorre
- Department of Diabetes, Endocrinology and Nutrition, Dr. Josep Trueta University Hospital, Girona 17007, Spain
- Nutrition, Eumetabolism and Health Group, Girona Biomedical Research Institute (IDIBGI), Girona 17190, Spain
- Department of Medical Sciences, School of Medicine, University of Girona, Girona 17003, Spain
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
| | - Elena de la Calle Vargas
- Department of Diabetes, Endocrinology and Nutrition, Dr. Josep Trueta University Hospital, Girona 17007, Spain
- Nutrition, Eumetabolism and Health Group, Girona Biomedical Research Institute (IDIBGI), Girona 17190, Spain
- Department of Medical Sciences, School of Medicine, University of Girona, Girona 17003, Spain
| | - Maria Pardo
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Grupo Obesidómica, Área de Endocrinología, Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS), Xerencia de Xestión Integrada de Santiago (IDIS/SERGAS), Santiago de Compostela 15706, Spain
| | - Victor Valentí
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Obesity Area, Clínica Universidad de Navarra, University of Navarra, Pamplona 31009, Spain
| | - Juan L Romero-Cabrera
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Nutrigenomics, Metabolic Syndrome Department, Servicio de Medicina Interna, Hospital Universitario Reina Sofía, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Universidad de Córdoba, Córdoba 14004, Spain
| | - Wilfredo Oliva-Olivera
- Servicio de Endocrinología y Nutrición, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Virgen de la Victoria, Universidad de Málaga, Málaga 29590, Spain
| | - Camilo Silva
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Obesity Area, Clínica Universidad de Navarra, University of Navarra, Pamplona 31009, Spain
| | - Carlos Diéguez
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela 15782, Spain
| | - Francesc Villarroya
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Department of Biochemistry and Molecular Biomedicine, Insitut de Biomedicina (IBUB), University of Barcelona, Barcelona 08028, Spain
| | - Miguel López
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela 15782, Spain
| | - Ana B Crujeiras
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Epigenomics in Endocinology and Nutrition Group, Epigenomics Unit, Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS/SERGAS), Santiago de Compostela 15706, Spain
| | - Luisa-Maria Seoane
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Endocrine Physiopathology Group, Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS), Complejo Hospitalario Universitario de Santiago (CHUS/SERGAS), Santiago de Compostela 15706, Spain
| | - José López-Miranda
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Nutrigenomics, Metabolic Syndrome Department, Servicio de Medicina Interna, Hospital Universitario Reina Sofía, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Universidad de Córdoba, Córdoba 14004, Spain
| | - Gema Frühbeck
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Obesity Area, Clínica Universidad de Navarra, University of Navarra, Pamplona 31009, Spain
| | - Francisco José Tinahones
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
- Servicio de Endocrinología y Nutrición, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Virgen de la Victoria, Universidad de Málaga, Málaga 29590, Spain
| | - José-Manuel Fernández-Real
- Department of Diabetes, Endocrinology and Nutrition, Dr. Josep Trueta University Hospital, Girona 17007, Spain
- Nutrition, Eumetabolism and Health Group, Girona Biomedical Research Institute (IDIBGI), Girona 17190, Spain
- Department of Medical Sciences, School of Medicine, University of Girona, Girona 17003, Spain
- Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Madrid 28029, Spain
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Carbonetti MP, Almeida-Oliveira F, Majerowicz D. Use of FGF21 analogs for the treatment of metabolic disorders: a systematic review and meta-analysis. ARCHIVES OF ENDOCRINOLOGY AND METABOLISM 2023; 68:e220493. [PMID: 37948566 PMCID: PMC10916804 DOI: 10.20945/2359-4292-2022-0493] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 04/23/2023] [Indexed: 11/12/2023]
Abstract
FGF21 is a hormone produced primarily by the liver with several metabolic functions, such as induction of heat production, control of glucose homeostasis, and regulation of blood lipid levels. Due to these actions, several laboratories have developed FGF21 analogs to treat patients with metabolic disorders such as obesity and diabetes. Here, we performed a systematic review and meta-analysis of randomized controlled trials that used FGF21 analogs and analyzed metabolic outcomes. Our search yielded 236 articles, and we included eight randomized clinical trials in the meta-analysis. The use of FGF21 analogs exhibited no effect on fasting blood glucose, glycated hemoglobin, HOMA index, blood free fatty acids or systolic blood pressure. However, the treatment significantly reduced fasting insulinemia, body weight and total cholesterolemia. None of the included studies were at high risk of bias. The quality of the evidence ranged from moderate to very low, especially due to imprecision and indirection issues. These results indicate that FGF21 analogs can potentially treat metabolic syndrome. However, more clinical trials are needed to increase the quality of evidence and confirm the effects seen thus far.
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Affiliation(s)
- Maria Paula Carbonetti
- Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - Fernanda Almeida-Oliveira
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - David Majerowicz
- Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
- Programa de Pós-graduação em Biociências, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil,
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Salih A, Ardissino M, Wagen AZ, Bard A, Szabo L, Ryten M, Petersen SE, Altmann A, Raisi‐Estabragh Z. Genome-Wide Association Study of Pericardial Fat Area in 28 161 UK Biobank Participants. J Am Heart Assoc 2023; 12:e030661. [PMID: 37889180 PMCID: PMC10727393 DOI: 10.1161/jaha.123.030661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 09/06/2023] [Indexed: 10/28/2023]
Abstract
BACKGROUND Pericardial adipose tissue (PAT) is the visceral adipose tissue compartment surrounding the heart. Experimental and observational research has suggested that greater PAT deposition might mediate cardiovascular disease, independent of general or subcutaneous adiposity. We characterize the genetic architecture of adiposity-adjusted PAT and identify causal associations between PAT and adverse cardiac magnetic resonance imaging measures of cardiac structure and function in 28 161 UK Biobank participants. METHODS AND RESULTS The PAT phenotype was extracted from cardiac magnetic resonance images using an automated image analysis tool previously developed and validated in this cohort. A genome-wide association study was performed with PAT area set as the phenotype, adjusting for age, sex, and other measures of obesity. Functional mapping and Bayesian colocalization were used to understand the biologic role of identified variants. Mendelian randomization analysis was used to examine potential causal links between genetically determined PAT and cardiac magnetic resonance-derived measures of left ventricular structure and function. We discovered 12 genome-wide significant variants, with 2 independent sentinel variants (rs6428792, P=4.20×10-9 and rs11992444, P=1.30×10-12) at 2 distinct genomic loci, that were mapped to 3 potentially causal genes: T-box transcription factor 15 (TBX15), tryptophanyl tRNA synthetase 2, mitochondrial (WARS2) and early B-cell factor-2 (EBF2) through functional annotation. Bayesian colocalization additionally suggested a role of RP4-712E4.1. Genetically predicted differences in adiposity-adjusted PAT were causally associated with adverse left ventricular remodeling. CONCLUSIONS This study provides insights into the genetic architecture determining differential PAT deposition, identifies causal links with left structural and functional parameters, and provides novel data about the pathophysiological importance of adiposity distribution.
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Affiliation(s)
- Ahmed Salih
- William Harvey Research Institute, National Institute for Health and Care Research (NIHR) Barts Biomedical Research CentreQueen Mary University of London, Charterhouse SquareLondonUnited Kingdom
| | - Maddalena Ardissino
- National Heart and Lung Institute, Imperial College LondonLondonUnited Kingdom
- Heart and Lung Research Institute, University of CambridgeCambridgeUnited Kingdom
| | - Aaron Z. Wagen
- Genetics and Genomic Medicine, Great Ormond Street Institute of Child HealthUniversity College LondonLondonUnited Kingdom
- Department of Clinical and Movement NeurosciencesQueen Square Institute of NeurologyLondonUnited Kingdom
- Neurodegeneration Biology LaboratoryThe Francis Crick InstituteLondonUnited Kingdom
| | - Andrew Bard
- William Harvey Research Institute, National Institute for Health and Care Research (NIHR) Barts Biomedical Research CentreQueen Mary University of London, Charterhouse SquareLondonUnited Kingdom
| | - Liliana Szabo
- William Harvey Research Institute, National Institute for Health and Care Research (NIHR) Barts Biomedical Research CentreQueen Mary University of London, Charterhouse SquareLondonUnited Kingdom
- Barts Heart Centre, St Bartholomew’s Hospital, Barts Health National Health Service (NHS) Trust, West SmithfieldLondonUnited Kingdom
- Semmelweis University, Heart and Vascular CenterBudapestHungary
| | - Mina Ryten
- Genetics and Genomic Medicine, Great Ormond Street Institute of Child HealthUniversity College LondonLondonUnited Kingdom
- NIHR Great Ormond Street Hospital Biomedical Research CentreUniversity College LondonLondonUnited Kingdom
| | - Steffen E. Petersen
- William Harvey Research Institute, National Institute for Health and Care Research (NIHR) Barts Biomedical Research CentreQueen Mary University of London, Charterhouse SquareLondonUnited Kingdom
- Barts Heart Centre, St Bartholomew’s Hospital, Barts Health National Health Service (NHS) Trust, West SmithfieldLondonUnited Kingdom
- Health Data Research UKLondonUnited Kingdom
- Alan Turing InstituteLondonUnited Kingdom
| | - André Altmann
- Centre for Medical Image Computing, Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUnited Kingdom
| | - Zahra Raisi‐Estabragh
- William Harvey Research Institute, National Institute for Health and Care Research (NIHR) Barts Biomedical Research CentreQueen Mary University of London, Charterhouse SquareLondonUnited Kingdom
- Barts Heart Centre, St Bartholomew’s Hospital, Barts Health National Health Service (NHS) Trust, West SmithfieldLondonUnited Kingdom
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8
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Rodríguez-Fdez S, Vidal-Puig A. Fuelling the fire: de novo lipogenesis primes thermogenesis. Nat Metab 2023; 5:1646-1648. [PMID: 37783944 DOI: 10.1038/s42255-023-00865-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Affiliation(s)
- S Rodríguez-Fdez
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK
- Victor Phillip Dahdaleh Heart & Lung Research Institute, Cambridge, UK
| | - A Vidal-Puig
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK.
- Victor Phillip Dahdaleh Heart & Lung Research Institute, Cambridge, UK.
- Cambridge University Nanjing Centre of Technology and Innovation, Nanjing, P.R. of China.
- Centro de Investigacion Principe Felipe (CIPF), Valencia, Spain.
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Lynes MD, Huang Q, Cora C, Su SC, Yi P, Tseng YH. A CRISPR Screen Identifies the E3 Ubiquitin Ligase Rfwd2 as a Negative Regulator of Glucose Uptake in Brown Adipocytes. Genes (Basel) 2023; 14:1865. [PMID: 37895214 PMCID: PMC10606202 DOI: 10.3390/genes14101865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 09/12/2023] [Accepted: 09/19/2023] [Indexed: 10/29/2023] Open
Abstract
Brown adipose tissue activation increases energy expenditure and has been shown to improve glucose tolerance, making it a promising target for the treatment of obesity and type 2 diabetes. Brown adipocytes differentiate into cells with multilocular lipid droplets, which can efficiently absorb and oxidize glucose; however, the mechanisms regulating these processes are not completely understood. We conducted a genome-wide loss-of-function screen using a CRISPR-based approach to identify genes that promote or inhibit adipogenesis and glucose uptake in brown adipocytes. We validated genes that negatively or positively regulated these pathways and verified that the E3-ubiquitin ligase Rfwd2 suppressed brown adipocyte glucose uptake. Brown adipocytes with CRISPR-targeted Rfwd2 deletion showed an altered proteomic landscape and increased basal, as well as insulin-stimulated, glucose uptake. These data reveal the complexity of genetic regulation of brown adipogenesis and glucose metabolism.
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Affiliation(s)
- Matthew D. Lynes
- Center for Molecular Medicine, Maine Health Institute for Research, Scarborough, ME 04074, USA
- Department of Medicine, Maine Health, Portland, ME 04101, USA
- Graduate School of Biomedical Science and Engineering, University of Maine, Orono, ME 04469, USA
- Roux Institute at Northeastern University, Portland, ME 04101, USA
| | - Qian Huang
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA; (Q.H.); (S.-C.S.)
| | - Carolina Cora
- Center for Molecular Medicine, Maine Health Institute for Research, Scarborough, ME 04074, USA
- Graduate School of Biomedical Science and Engineering, University of Maine, Orono, ME 04469, USA
| | - Sheng-Chiang Su
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA; (Q.H.); (S.-C.S.)
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan
| | - Peng Yi
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA; (Q.H.); (S.-C.S.)
- Harvard Stem Cell Institute, Harvard University, Cambridge, MA 02138, USA
| | - Yu-Hua Tseng
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA; (Q.H.); (S.-C.S.)
- Harvard Stem Cell Institute, Harvard University, Cambridge, MA 02138, USA
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10
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Nie T, Lu J, Zhang H, Mao L. Latest advances in the regulatory genes of adipocyte thermogenesis. Front Endocrinol (Lausanne) 2023; 14:1250487. [PMID: 37680891 PMCID: PMC10482227 DOI: 10.3389/fendo.2023.1250487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 08/07/2023] [Indexed: 09/09/2023] Open
Abstract
An energy imbalance cause obesity: more energy intake or less energy expenditure, or both. Obesity could be the origin of many metabolic disorders, such as type 2 diabetes and cardiovascular disease. UCP1 (uncoupling protein1), which is highly and exclusively expressed in the thermogenic adipocytes, including beige and brown adipocytes, can dissipate proton motive force into heat without producing ATP to increase energy expenditure. It is an attractive strategy to combat obesity and its related metabolic disorders by increasing non-shivering adipocyte thermogenesis. Adipocyte thermogenesis has recently been reported to be regulated by several new genes. This work provided novel and potential targets to activate adipocyte thermogenesis and resist obesity, such as secreted proteins ADISSP and EMC10, enzyme SSU72, etc. In this review, we have summarized the latest research on adipocyte thermogenesis regulation to shed more light on this topic.
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Affiliation(s)
- Tao Nie
- School of Basic Medicine, Hubei University of Arts and Science, Xiangyang, China
| | - Jinli Lu
- Scientific Research Center, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China
| | - Hua Zhang
- Department of Medical Iconography, The Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Liufeng Mao
- Scientific Research Center, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China
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11
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Ricci M, De Feo MS, Granese GM, Frantellizzi V, Carabellese B, Lubrano E, Cimini A. 18F-FDG PET/CT technology for the assessment of brown adipose tissue: an updated review. Expert Rev Med Devices 2023; 20:1143-1156. [PMID: 37965719 DOI: 10.1080/17434440.2023.2283618] [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: 05/30/2023] [Accepted: 11/10/2023] [Indexed: 11/16/2023]
Abstract
INTRODUCTION This review provides an update of 18 F-fluorodeoxyglucose ([18F] FDG) for Brown adipose tissue (BAT) activity quantification, whose role is not completely understood. AREAS COVERED We conducted an unstructured search of the literature for any studies employing the [18F] FDG PET in BAT assessment. We explored BAT quantification both in healthy individuals and in different pathologies, after cold exposure and as a metabolic biomarker. The assessment of possible BAT modulators by using [18F] FDG PET is shown. Further PET tracers and novel developments for BAT assessments are also described. EXPERT OPINION Further PET tracers and imaging modalities are under investigation, but the [18F] FDG PET is currently the method of choice for the evaluation of BAT and further multicentric trials are needed for a better understanding of the BAT physiopathology, also after cold stimuli. The modulation of BAT activity, assessed by [18F] FDG PET imaging, seems a promising tool for the management of conditions such as obesity and type 2 diabetes. Moreover, an interesting possible correlation of BAT activation with prognostic [18F] FDG PET indices in cancer patients should be assessed with further multicentric trials.
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Affiliation(s)
- Maria Ricci
- Nuclear Medicine Unit, Cardarelli Hospital, Campobasso, Italy
| | - Maria Silvia De Feo
- Department of Radiological Sciences Oncology and Anatomo-Pathology, Sapienza University of Rome, Rome, Italy
| | - Giorgia Maria Granese
- Department of Radiological Sciences Oncology and Anatomo-Pathology, Sapienza University of Rome, Rome, Italy
| | - Viviana Frantellizzi
- Department of Radiological Sciences Oncology and Anatomo-Pathology, Sapienza University of Rome, Rome, Italy
| | | | - Ennio Lubrano
- Dipartimento di Medicina e Scienze della Salute, Università degli Studi del Molise, Italy
- Department of Development and Regeneration, Skeletal Biology and Engineering Research Center, KU Leuven, Leuven, Belgium
| | - Andrea Cimini
- Nuclear Medicine Unit, St. Salvatore Hospital, L'Aquila, Italy
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12
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Valenzuela PL, Carrera-Bastos P, Castillo-García A, Lieberman DE, Santos-Lozano A, Lucia A. Obesity and the risk of cardiometabolic diseases. Nat Rev Cardiol 2023; 20:475-494. [PMID: 36927772 DOI: 10.1038/s41569-023-00847-5] [Citation(s) in RCA: 53] [Impact Index Per Article: 53.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/08/2023] [Indexed: 03/18/2023]
Abstract
The prevalence of obesity has reached pandemic proportions, and now approximately 25% of adults in Westernized countries have obesity. Recognized as a major health concern, obesity is associated with multiple comorbidities, particularly cardiometabolic disorders. In this Review, we present obesity as an evolutionarily novel condition, summarize the epidemiological evidence on its detrimental cardiometabolic consequences and discuss the major mechanisms involved in the association between obesity and the risk of cardiometabolic diseases. We also examine the role of potential moderators of this association, with evidence for and against the so-called 'metabolically healthy obesity phenotype', the 'fatness but fitness' paradox or the 'obesity paradox'. Although maintenance of optimal cardiometabolic status should be a primary goal in individuals with obesity, losing body weight and, particularly, excess visceral adiposity seems to be necessary to minimize the risk of cardiometabolic diseases.
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Affiliation(s)
- Pedro L Valenzuela
- Physical Activity and Health Research Group (PaHerg), Research Institute of Hospital 12 de Octubre ("i + 12"), Madrid, Spain.
- Department of Systems Biology, University of Alcalá, Alcalá de Henares, Spain.
| | - Pedro Carrera-Bastos
- Center for Primary Health Care Research, Department of Clinical Sciences, Lund University, Malmö, Sweden
- Faculty of Sport Sciences, Universidad Europea de Madrid, Madrid, Spain
| | | | - Daniel E Lieberman
- Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, USA
| | - Alejandro Santos-Lozano
- Physical Activity and Health Research Group (PaHerg), Research Institute of Hospital 12 de Octubre ("i + 12"), Madrid, Spain
- Department of Health Sciences, European University Miguel de Cervantes, Valladolid, Spain
| | - Alejandro Lucia
- Faculty of Sport Sciences, Universidad Europea de Madrid, Madrid, Spain.
- CIBER of Frailty and Healthy Aging (CIBERFES), Madrid, Spain.
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13
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Pellegrinelli V, Figueroa-Juárez E, Samuelson I, U-Din M, Rodriguez-Fdez S, Virtue S, Leggat J, Çubuk C, Peirce VJ, Niemi T, Campbell M, Rodriguez-Cuenca S, Blázquez JD, Carobbio S, Virtanen KA, Vidal-Puig A. Defective extracellular matrix remodeling in brown adipose tissue is associated with fibro-inflammation and reduced diet-induced thermogenesis. Cell Rep 2023; 42:112640. [PMID: 37318951 DOI: 10.1016/j.celrep.2023.112640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 04/25/2023] [Accepted: 05/29/2023] [Indexed: 06/17/2023] Open
Abstract
The relevance of extracellular matrix (ECM) remodeling is reported in white adipose tissue (AT) and obesity-related dysfunctions, but little is known about the importance of ECM remodeling in brown AT (BAT) function. Here, we show that a time course of high-fat diet (HFD) feeding progressively impairs diet-induced thermogenesis concomitantly with the development of fibro-inflammation in BAT. Higher markers of fibro-inflammation are associated with lower cold-induced BAT activity in humans. Similarly, when mice are housed at thermoneutrality, inactivated BAT features fibro-inflammation. We validate the pathophysiological relevance of BAT ECM remodeling in response to temperature challenges and HFD using a model of a primary defect in the collagen turnover mediated by partial ablation of the Pepd prolidase. Pepd-heterozygous mice display exacerbated dysfunction and BAT fibro-inflammation at thermoneutrality and in HFD. Our findings show the relevance of ECM remodeling in BAT activation and provide a mechanism for BAT dysfunction in obesity.
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Affiliation(s)
- Vanessa Pellegrinelli
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK.
| | - Elizabeth Figueroa-Juárez
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK
| | - Isabella Samuelson
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK
| | - Mueez U-Din
- Turku PET Centre, University of Turku, Turku, Finland; Turku PET Centre, Turku University Hospital, Turku, Finland
| | - Sonia Rodriguez-Fdez
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK
| | - Samuel Virtue
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK
| | - Jennifer Leggat
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK
| | - Cankut Çubuk
- Platform of Computational Medicine, Fundación Progreso y Salud (FPS), Hospital Virgen Del Rocío, 41013 Sevilla, Spain
| | - Vivian J Peirce
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK
| | - Tarja Niemi
- Department of Plastic and General Surgery, Turku University Hospital, Turku, Finland
| | - Mark Campbell
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK; Cambridge University Nanjing Centre of Technology and Innovation, Nanjing, P.R. China
| | - Sergio Rodriguez-Cuenca
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK; Cambridge University Nanjing Centre of Technology and Innovation, Nanjing, P.R. China
| | - Joaquin Dopazo Blázquez
- Platform of Computational Medicine, Fundación Progreso y Salud (FPS), Hospital Virgen Del Rocío, 41013 Sevilla, Spain; Bioinformatics in RareDiseases (BiER), Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), 41013 Sevilla, Spain; Computational Systems Medicine, Institute of Biomedicine of Seville (IBiS), Sevilla 41013, Spain; Functional Genomics Node (INB-ELIXIR-es), Sevilla, Spain
| | - Stefania Carobbio
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK; Centro de Investigacion Principe Felipe (CIPF), Valencia, Spain
| | - Kirsi A Virtanen
- Turku PET Centre, University of Turku, Turku, Finland; Institute of Public Health and Clinical Nutrition, University of Eastern Finland (UEF), Kuopio, Finland; Department of Endocrinology and Clinical Nutrition, Kuopio University Hospital, Kuopio, Finland
| | - Antonio Vidal-Puig
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, University of Cambridge, Cambridge, UK; Cambridge University Nanjing Centre of Technology and Innovation, Nanjing, P.R. China; Centro de Investigacion Principe Felipe (CIPF), Valencia, Spain; Cambridge Heart and Lung Research Institute, Cambridge, UK.
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14
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Dolce A, Della Torre S. Sex, Nutrition, and NAFLD: Relevance of Environmental Pollution. Nutrients 2023; 15:nu15102335. [PMID: 37242221 DOI: 10.3390/nu15102335] [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: 04/18/2023] [Revised: 05/12/2023] [Accepted: 05/13/2023] [Indexed: 05/28/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is the most common form of chronic liver disease and represents an increasing public health issue given the limited treatment options and its association with several other metabolic and inflammatory disorders. The epidemic, still growing prevalence of NAFLD worldwide cannot be merely explained by changes in diet and lifestyle that occurred in the last few decades, nor from their association with genetic and epigenetic risk factors. It is conceivable that environmental pollutants, which act as endocrine and metabolic disruptors, may contribute to the spreading of this pathology due to their ability to enter the food chain and be ingested through contaminated food and water. Given the strict interplay between nutrients and the regulation of hepatic metabolism and reproductive functions in females, pollutant-induced metabolic dysfunctions may be of particular relevance for the female liver, dampening sex differences in NAFLD prevalence. Dietary intake of environmental pollutants can be particularly detrimental during gestation, when endocrine-disrupting chemicals may interfere with the programming of liver metabolism, accounting for the developmental origin of NAFLD in offspring. This review summarizes cause-effect evidence between environmental pollutants and increased incidence of NAFLD and emphasizes the need for further studies in this field.
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Affiliation(s)
- Arianna Dolce
- Department of Pharmaceutical Sciences, University of Milan, 20133 Milan, Italy
| | - Sara Della Torre
- Department of Pharmaceutical Sciences, University of Milan, 20133 Milan, Italy
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15
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Hropot T, Herman R, Janez A, Lezaic L, Jensterle M. Brown Adipose Tissue: A New Potential Target for Glucagon-like Peptide 1 Receptor Agonists in the Treatment of Obesity. Int J Mol Sci 2023; 24:ijms24108592. [PMID: 37239935 DOI: 10.3390/ijms24108592] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/01/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Adipose tissue can be divided into white adipose tissue (WAT), brown adipose tissue (BAT), and beige adipose tissue, according to the differences in morphology. WAT acts as a buffer for increased energy intake and decreased energy expenditure during the development of obesity, resulting in visceral and ectopic WAT accumulation. These WAT depots are strongly associated with chronic systemic inflammation, insulin resistance, and cardiometabolic risk related to obesity. They represent a primary weight loss target in anti-obesity management. Second-generation anti-obesity medications glucagon-like peptide-1 receptor agonists (GLP-1RAs) cause weight loss and improve body composition by reducing visceral and ectopic fat depots of WAT, resulting in improved cardiometabolic health. Recently, the understanding of the physiological significance of BAT beyond its primary function in generating heat through non-shivering thermogenesis has been expanded. This has raised scientific and pharmaceutical interest in the manipulation of BAT to further enhance weight reduction and body weight maintenance. This narrative review focuses on the potential impact of GLP-1 receptor agonism on BAT, particularly in human clinical studies. It provides an overview of the role of BAT in weight management and highlights the need for further research to elucidate the mechanisms by which GLP-1RAs affect energy metabolism and weight loss. Despite encouraging preclinical data, limited clinical evidence supports the notion that GLP-1RAs contribute to BAT activation.
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Affiliation(s)
- Tim Hropot
- Department of Pediatric Endocrinology, Diabetes and Metabolic Diseases, University Children's Hospital, 1000 Ljubljana, Slovenia
| | - Rok Herman
- Department for Endocrinology, Diabetes and Metabolic Diseases, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia
- Department of Internal Medicine, Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Andrej Janez
- Department for Endocrinology, Diabetes and Metabolic Diseases, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia
- Department of Internal Medicine, Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Luka Lezaic
- Department of Internal Medicine, Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
- Department for Nuclear Medicine, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia
| | - Mojca Jensterle
- Department for Endocrinology, Diabetes and Metabolic Diseases, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia
- Department of Internal Medicine, Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
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16
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Xue S, Lee D, Berry DC. Thermogenic adipose tissue in energy regulation and metabolic health. Front Endocrinol (Lausanne) 2023; 14:1150059. [PMID: 37020585 PMCID: PMC10067564 DOI: 10.3389/fendo.2023.1150059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Accepted: 03/07/2023] [Indexed: 04/07/2023] Open
Abstract
The ability to generate thermogenic fat could be a targeted therapy to thwart obesity and improve metabolic health. Brown and beige adipocytes are two types of thermogenic fat cells that regulate energy balance. Both adipocytes share common morphological, biochemical, and thermogenic properties. Yet, recent evidence suggests unique features exist between brown and beige adipocytes, such as their cellular origin and thermogenic regulatory processes. Beige adipocytes also appear highly plastic, responding to environmental stimuli and interconverting between beige and white adipocyte states. Additionally, beige adipocytes appear to be metabolically heterogenic and have substrate specificity. Nevertheless, obese and aged individuals cannot develop beige adipocytes in response to thermogenic fat-inducers, creating a key clinical hurdle to their therapeutic promise. Thus, elucidating the underlying developmental, molecular, and functional mechanisms that govern thermogenic fat cells will improve our understanding of systemic energy regulation and strive for new targeted therapies to generate thermogenic fat. This review will examine the recent advances in thermogenic fat biogenesis, molecular regulation, and the potential mechanisms for their failure.
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Affiliation(s)
| | | | - Daniel C. Berry
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, United States
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17
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Abstract
Brown adipose tissue (BAT) displays the unique capacity to generate heat through uncoupled oxidative phosphorylation that makes it a very attractive therapeutic target for cardiometabolic diseases. Here, we review BAT cellular metabolism, its regulation by the central nervous and endocrine systems and circulating metabolites, the plausible roles of this tissue in human thermoregulation, energy balance, and cardiometabolic disorders, and the current knowledge on its pharmacological stimulation in humans. The current definition and measurement of BAT in human studies relies almost exclusively on BAT glucose uptake from positron emission tomography with 18F-fluorodeoxiglucose, which can be dissociated from BAT thermogenic activity, as for example in insulin-resistant states. The most important energy substrate for BAT thermogenesis is its intracellular fatty acid content mobilized from sympathetic stimulation of intracellular triglyceride lipolysis. This lipolytic BAT response is intertwined with that of white adipose (WAT) and other metabolic tissues, and cannot be independently stimulated with the drugs tested thus far. BAT is an interesting and biologically plausible target that has yet to be fully and selectively activated to increase the body's thermogenic response and shift energy balance. The field of human BAT research is in need of methods able to directly, specifically, and reliably measure BAT thermogenic capacity while also tracking the related thermogenic responses in WAT and other tissues. Until this is achieved, uncertainty will remain about the role played by this fascinating tissue in human cardiometabolic diseases.
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Affiliation(s)
- André C Carpentier
- Correspondence: André C. Carpentier, MD, Division of Endocrinology, Faculty of Medicine, University of Sherbrooke, 3001, 12th Ave N, Sherbrooke, Quebec, J1H 5N4, Canada.
| | - Denis P Blondin
- Division of Neurology, Department of Medicine, Centre de recherche du Centre hospitalier universitaire de Sherbrooke, Université de Sherbrooke, Sherbrooke, Quebec, J1H 5N4, Canada
| | | | - Denis Richard
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Quebec City, Quebec, G1V 4G5, Canada
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18
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Nandula SR, Nylen ES, Sen S. Novel Therapeutics in Nonalcoholic Fatty Liver Disease: A Focus on Adult Stem Cells. Metab Syndr Relat Disord 2023; 21:71-78. [PMID: 36625898 DOI: 10.1089/met.2022.0069] [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: 01/11/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is the most common chronic liver disorder that is associated with abnormal accumulation of fat in the liver, which can lead to a wide variety of pathological liver defects and associated insulin resistance (IR), obesity, hypertension, dyslipidemia, diabetes, and cardiovascular disease. The molecular mechanisms that cause the initiation and progression of NAFLD are not fully understood. Increased lipolysis and de novo hepatic lipid synthesis lead to oxidative stress induced by reactive oxygen species and inflammation. Both these two entities could be interrelated and be an important mechanistic pathway, which can lead to tissue injury and hepatic cell death. Mechanisms for worsening of NAFLD include mitochondrial abnormalities, downregulation of glutathione (GSH), decreased activity of GSH-dependent antioxidants, accumulation of activated macrophages, hepatic inflammation, systemic inflammation, IR, and poorly controlled type 2 diabetes mellitus. Although no specific therapy has been approved for NAFLD, we review the latest medical therapeutics with emphasis on stem cell-based possibilities based on the presumed pathophysiology of NAFLD.
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Affiliation(s)
- Seshagiri Rao Nandula
- Division of Endocrinology, Department of Medicine, Veterans Affairs Medical Center, Washington, District of Columbia, USA.,Department of Biochemistry and Molecular Medicine, The George Washington University, School of Medicine and Health Sciences, Washington, District of Columbia, USA
| | - Eric S Nylen
- Division of Endocrinology, Department of Medicine, Veterans Affairs Medical Center, Washington, District of Columbia, USA.,Department of Biochemistry and Molecular Medicine, The George Washington University, School of Medicine and Health Sciences, Washington, District of Columbia, USA
| | - Sabyasachi Sen
- Division of Endocrinology, Department of Medicine, Veterans Affairs Medical Center, Washington, District of Columbia, USA.,Department of Biochemistry and Molecular Medicine, The George Washington University, School of Medicine and Health Sciences, Washington, District of Columbia, USA
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19
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Ziqubu K, Dludla PV, Mthembu SXH, Nkambule BB, Mabhida SE, Jack BU, Nyambuya TM, Mazibuko-Mbeje SE. An insight into brown/beige adipose tissue whitening, a metabolic complication of obesity with the multifactorial origin. Front Endocrinol (Lausanne) 2023; 14:1114767. [PMID: 36875450 PMCID: PMC9978510 DOI: 10.3389/fendo.2023.1114767] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 02/06/2023] [Indexed: 02/18/2023] Open
Abstract
Brown adipose tissue (BAT), a thermoregulatory organ known to promote energy expenditure, has been extensively studied as a potential avenue to combat obesity. Although BAT is the opposite of white adipose tissue (WAT) which is responsible for energy storage, BAT shares thermogenic capacity with beige adipose tissue that emerges from WAT depots. This is unsurprising as both BAT and beige adipose tissue display a huge difference from WAT in terms of their secretory profile and physiological role. In obesity, the content of BAT and beige adipose tissue declines as these tissues acquire the WAT characteristics via the process called "whitening". This process has been rarely explored for its implication in obesity, whether it contributes to or exacerbates obesity. Emerging research has demonstrated that BAT/beige adipose tissue whitening is a sophisticated metabolic complication of obesity that is linked to multiple factors. The current review provides clarification on the influence of various factors such as diet, age, genetics, thermoneutrality, and chemical exposure on BAT/beige adipose tissue whitening. Moreover, the defects and mechanisms that underpin the whitening are described. Notably, the BAT/beige adipose tissue whitening can be marked by the accumulation of large unilocular lipid droplets, mitochondrial degeneration, and collapsed thermogenic capacity, by the virtue of mitochondrial dysfunction, devascularization, autophagy, and inflammation.
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Affiliation(s)
- Khanyisani Ziqubu
- Department of Biochemistry, North-West University, Mmabatho, South Africa
| | - Phiwayinkosi V. Dludla
- Biomedical Research and Innovation Platform, South African Medical Research Council, Tygerberg, South Africa
- Department of Biochemistry and Microbiology, Faculty of Science and Agriculture, University of Zululand, KwaDlangezwa, South Africa
| | - Sinenhlanhla X. H. Mthembu
- Department of Biochemistry, North-West University, Mmabatho, South Africa
- Biomedical Research and Innovation Platform, South African Medical Research Council, Tygerberg, South Africa
| | - Bongani B. Nkambule
- School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Sihle E. Mabhida
- Biomedical Research and Innovation Platform, South African Medical Research Council, Tygerberg, South Africa
| | - Babalwa U. Jack
- Biomedical Research and Innovation Platform, South African Medical Research Council, Tygerberg, South Africa
| | - Tawanda M. Nyambuya
- Department of Health Sciences, Faculty of Health and Applied Sciences, Namibia University of Science and Technology, Windhoek, Namibia
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20
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Eljalby M, Huang X, Becher T, Wibmer AG, Jiang CS, Vaughan R, Schöder H, Cohen P. Brown adipose tissue is not associated with cachexia or increased mortality in a retrospective study of patients with cancer. Am J Physiol Endocrinol Metab 2023; 324:E144-E153. [PMID: 36576355 PMCID: PMC9902220 DOI: 10.1152/ajpendo.00187.2022] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 11/28/2022] [Accepted: 12/19/2022] [Indexed: 12/29/2022]
Abstract
Although brown fat is strongly associated with a constellation of cardiometabolic benefits in animal models and humans, it has also been tied to cancer cachexia. In humans, cancer-associated cachexia increases mortality, raising the possibility that brown fat in this context may be associated with increased cancer death. However, the effect of brown fat on cancer-associated cachexia and survival in humans remains unclear. Here, we retrospectively identify patients with and without brown fat on fluorodeoxyglucose (18F-FDG) positron-emission tomography (PET) scans obtained as part of routine cancer care and assemble a cohort to address these questions. We did not find an association between brown fat status and cachexia. Furthermore, we did not observe an association between brown fat and increased mortality in patients with cachexia. Our analyses controlled for confounding factors including age at cancer diagnosis, sex, body mass index, cancer site, cancer stage, outdoor temperature, comorbid conditions (heart failure, type 2 diabetes mellitus, coronary artery disease, hypertension, dyslipidemia, cerebrovascular disease), and β-blocker use. Taken together, our results suggest that brown fat is not linked to cancer-associated cachexia and does not worsen overall survival in patients with cachexia.NEW & NOTEWORTHY This study finds that brown fat is not linked to cancer-associated cachexia. Moreover, this work shows that brown fat does not worsen overall survival in patients with cachexia.
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Affiliation(s)
- Mahmoud Eljalby
- Laboratory of Molecular Metabolism, The Rockefeller University, New York, New York
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, Texas
| | - Xiaojing Huang
- Laboratory of Molecular Metabolism, The Rockefeller University, New York, New York
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Tobias Becher
- Laboratory of Molecular Metabolism, The Rockefeller University, New York, New York
- DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Mannheim, Germany
- First Department of Medicine (Division of Cardiology), University Medical Center Mannheim, Mannheim, Germany
| | - Andreas G Wibmer
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York City, New York
| | - Caroline S Jiang
- Center for Clinical and Translational Science, The Rockefeller University, New York City, New York
| | - Roger Vaughan
- Center for Clinical and Translational Science, The Rockefeller University, New York City, New York
- Graduate School of Medical Sciences, Weill Cornell Medicine, New York City, New York
| | - Heiko Schöder
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York City, New York
| | - Paul Cohen
- Laboratory of Molecular Metabolism, The Rockefeller University, New York, New York
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21
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Abstract
Rather than serving as a mere onlooker, adipose tissue is a complex endocrine organ and active participant in disease initiation and progression. Disruptions of biological processes operating within adipose can disturb healthy systemic physiology, the sequelae of which include metabolic disorders such as obesity and type 2 diabetes. A burgeoning interest in the field of adipose research has allowed for the elucidation of regulatory networks underlying both adipose tissue function and dysfunction. Despite this progress, few diseases are treated by targeting maladaptation in the adipose, an oft-overlooked organ. In this review, we elaborate on the distinct subtypes of adipocytes, their developmental origins and secretory roles, and the dynamic interplay at work within the tissue itself. Central to this discussion is the relationship between adipose and disease states, including obesity, cachexia, and infectious diseases, as we aim to leverage our wealth of knowledge for the development of novel and targeted therapeutics.
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Affiliation(s)
- Christopher Auger
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA;
| | - Shingo Kajimura
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA; .,Howard Hughes Medical Institute, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA;
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22
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Saito M, Okamatsu-Ogura Y. Thermogenic Brown Fat in Humans: Implications in Energy Homeostasis, Obesity and Metabolic Disorders. World J Mens Health 2023:41.e26. [PMID: 36792089 DOI: 10.5534/wjmh.220224] [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: 10/12/2022] [Accepted: 11/08/2022] [Indexed: 01/27/2023] Open
Abstract
In mammals including humans, there are two types of adipose tissue, white and brown adipose tissues (BATs). White adipose tissue is the primary site of energy storage, while BAT is a specialized tissue for non-shivering thermogenesis to dissipate energy as heat. Although BAT research has long been limited mostly in small rodents, the rediscovery of metabolically active BAT in adult humans has dramatically promoted the translational studies on BAT in health and diseases. It is now established that BAT, through its thermogenic and energy dissipating activities, plays a role in the regulation of body temperature, whole-body energy expenditure, and body fatness. Moreover, increasing evidence has demonstrated that BAT secretes various paracrine and endocrine factors, which influence other peripheral tissues and control systemic metabolic homeostasis, suggesting BAT as a metabolic regulator, other than for thermogenesis. In fact, clinical studies have revealed an association of BAT not only with metabolic disorders such as insulin resistance, diabetes, dyslipidemia, and fatty liver, but also with cardiovascular diseases including hypertension and atherosclerosis. Thus, BAT is an intriguing tissue combating obesity and related metabolic diseases. In this review, we summarize current knowledge on human BAT, focusing its patho-physiological roles in energy homeostasis, obesity and related metabolic disorders. The effects of aging and sex on BAT are also discussed.
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Affiliation(s)
- Masayuki Saito
- Laboratory of Biochemistry, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
| | - Yuko Okamatsu-Ogura
- Laboratory of Biochemistry, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
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23
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Yabut JM, Drucker DJ. Glucagon-like Peptide-1 Receptor-based Therapeutics for Metabolic Liver Disease. Endocr Rev 2023; 44:14-32. [PMID: 35907261 DOI: 10.1210/endrev/bnac018] [Citation(s) in RCA: 27] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Indexed: 01/14/2023]
Abstract
Glucagon-like peptide-1 (GLP-1) controls islet hormone secretion, gut motility, and body weight, supporting development of GLP-1 receptor agonists (GLP-1RA) for the treatment of type 2 diabetes (T2D) and obesity. GLP-1RA exhibit a favorable safety profile and reduce the incidence of major adverse cardiovascular events in people with T2D. Considerable preclinical data, supported by the results of clinical trials, link therapy with GLP-RA to reduction of hepatic inflammation, steatosis, and fibrosis. Mechanistically, the actions of GLP-1 on the liver are primarily indirect, as hepatocytes, Kupffer cells, and stellate cells do not express the canonical GLP-1R. GLP-1RA reduce appetite and body weight, decrease postprandial lipoprotein secretion, and attenuate systemic and tissue inflammation, actions that may contribute to attenuation of metabolic-associated fatty liver disease (MAFLD). Here we discuss evolving concepts of GLP-1 action that improve liver health and highlight evidence that links sustained GLP-1R activation in distinct cell types to control of hepatic glucose and lipid metabolism, and reduction of experimental and clinical nonalcoholic steatohepatitis (NASH). The therapeutic potential of GLP-1RA alone, or in combination with peptide agonists, or new small molecule therapeutics is discussed in the context of potential efficacy and safety. Ongoing trials in people with obesity will further clarify the safety of GLP-1RA, and pivotal studies underway in people with NASH will define whether GLP-1-based medicines represent effective and safe therapies for people with MAFLD.
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Affiliation(s)
- Julian M Yabut
- Department of Medicine, Lunenfeld-Tanenbaum Research Institute, Mt. Sinai Hospital, University of Toronto, Toronto, ON, Canada
| | - Daniel J Drucker
- Department of Medicine, Lunenfeld-Tanenbaum Research Institute, Mt. Sinai Hospital, University of Toronto, Toronto, ON, Canada
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24
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Takeda Y, Harada Y, Yoshikawa T, Dai P. Mitochondrial Energy Metabolism in the Regulation of Thermogenic Brown Fats and Human Metabolic Diseases. Int J Mol Sci 2023; 24:ijms24021352. [PMID: 36674862 PMCID: PMC9861294 DOI: 10.3390/ijms24021352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/06/2023] [Accepted: 01/09/2023] [Indexed: 01/13/2023] Open
Abstract
Brown fats specialize in thermogenesis by increasing the utilization of circulating blood glucose and fatty acids. Emerging evidence suggests that brown adipose tissue (BAT) prevents the incidence of obesity-associated metabolic diseases and several types of cancers in humans. Mitochondrial energy metabolism in brown/beige adipocytes regulates both uncoupling protein 1 (UCP1)-dependent and -independent thermogenesis for cold adaptation and the utilization of excess nutrients and energy. Many studies on the quantification of human BAT indicate that mass and activity are inversely correlated with the body mass index (BMI) and visceral adiposity. Repression is caused by obesity-associated positive and negative factors that control adipocyte browning, de novo adipogenesis, mitochondrial energy metabolism, UCP1 expression and activity, and noradrenergic response. Systemic and local factors whose levels vary between lean and obese conditions include growth factors, inflammatory cytokines, neurotransmitters, and metal ions such as selenium and iron. Modulation of obesity-associated repression in human brown fats is a promising strategy to counteract obesity and related metabolic diseases through the activation of thermogenic capacity. In this review, we highlight recent advances in mitochondrial metabolism, thermogenic regulation of brown fats, and human metabolic diseases.
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Affiliation(s)
- Yukimasa Takeda
- Department of Cellular Regenerative Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan
- Correspondence: (Y.T.); (P.D.); Tel.: +81-75-251-5444 (Y.T.); +81-75-251-5135 (P.D.)
| | - Yoshinori Harada
- Department of Pathology and Cell Regulation, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan
| | - Toshikazu Yoshikawa
- Department of Cellular Regenerative Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan
- Louis Pasteur Center for Medical Research, 103-5 Tanaka-Monzen-cho, Sakyo-ku, Kyoto 606-8225, Japan
| | - Ping Dai
- Department of Cellular Regenerative Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan
- Correspondence: (Y.T.); (P.D.); Tel.: +81-75-251-5444 (Y.T.); +81-75-251-5135 (P.D.)
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25
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Chen Y, Hu Q, Wang C, Wang T. The crosstalk between BAT thermogenesis and skeletal muscle dysfunction. Front Physiol 2023; 14:1132830. [PMID: 37153220 PMCID: PMC10160478 DOI: 10.3389/fphys.2023.1132830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Accepted: 04/11/2023] [Indexed: 05/09/2023] Open
Abstract
Metabolic defects increase the risk of skeletal muscle diseases, and muscle impairment might worsen metabolic disruption, leading to a vicious cycle. Both brown adipose tissue (BAT) and skeletal muscle play important roles in non-shivering thermogenesis to regulate energy homeostasis. BAT regulates body temperature, systemic metabolism, and seretion of batokines that have positive or negative impacts on skeletal muscle. Conversely, muscle can secrete myokines that regulate BAT function. This review explained the crosstalk between BAT and skeletal muscle, and then discussed the batokines and highlighted their impact on skeletal muscle under physiological conditions. BAT is now considered a potential therapeutic target for obesity and diabetes treatment. Moreover, manipulation of BAT may be an attractive approach for the treatment of muscle weakness by correcting metabolic deficits. Therefore, exploring BAT as a potential treatment for sarcopenia could be a promising avenue for future research.
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Affiliation(s)
- Yao Chen
- Department of Breast Surgery, West China Hospital, Sichuan University, Chengdu, China
| | - Qian Hu
- Health Management Center, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Changyi Wang
- Department of Rehabilitation Medicine, Key Laboratory of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
- Institute of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
- *Correspondence: Changyi Wang, ; Tiantian Wang,
| | - Tiantian Wang
- Department of Rehabilitation Medicine, Key Laboratory of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
- Institute of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
- *Correspondence: Changyi Wang, ; Tiantian Wang,
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26
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Gunawardana S. Brown Adipose Tissue Transplantation. Methods Mol Biol 2023; 2662:193-202. [PMID: 37076682 DOI: 10.1007/978-1-0716-3167-6_17] [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: 04/21/2023]
Abstract
The metabolic benefits of brown adipose tissue (BAT) are well known. Increasing the BAT content and/or activity is a proposed therapeutic approach to combat metabolic disease. Activation and induction of endogenous BAT have achieved varying degrees of success in correcting obesity, insulin resistance, and cardiovascular disease, with some limitations. Transplantation of BAT from healthy donors is another approach proven safe and effective in rodent models. In diet-induced models of obesity and insulin resistance, BAT transplants prevent obesity, increase insulin sensitivity, and improve glucose homeostasis and whole-body energy metabolism. In mouse models of insulin-dependent diabetes, subcutaneous transplantation of healthy BAT produces long-term euglycemia without the need for insulin or immunosuppression. Considering the immunomodulatory and anti-inflammatory properties of healthy BAT, transplantation may be a more effective approach to combat metabolic disease in the long term. Here we describe in detail the technique for subcutaneous BAT transplantation.
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Affiliation(s)
- Subhadra Gunawardana
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO, USA.
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27
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Acosta-Martinez M, Cabail MZ. The PI3K/Akt Pathway in Meta-Inflammation. Int J Mol Sci 2022; 23:ijms232315330. [PMID: 36499659 PMCID: PMC9740745 DOI: 10.3390/ijms232315330] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/22/2022] [Accepted: 12/01/2022] [Indexed: 12/09/2022] Open
Abstract
Obesity is a global epidemic representing a serious public health burden as it is a major risk factor for the development of cardiovascular disease, stroke and all-cause mortality. Chronic low-grade systemic inflammation, also known as meta-inflammation, is thought to underly obesity's negative health consequences, which include insulin resistance and the development of type 2 diabetes. Meta-inflammation is characterized by the accumulation of immune cells in adipose tissue, a deregulation in the synthesis and release of adipokines and a pronounced increase in the production of proinflammatory factors. In this state, the infiltration of macrophages and their metabolic activation contributes to complex paracrine and autocrine signaling, which sustains a proinflammatory microenvironment. A key signaling pathway mediating the response of macrophages and adipocytes to a microenvironment of excessive nutrients is the phosphoinositide 3-kinase (PI3K)/Akt pathway. This multifaceted network not only transduces metabolic information but also regulates macrophages' intracellular changes, which are responsible for their phenotypic switch towards a more proinflammatory state. In the present review, we discuss how the crosstalk between macrophages and adipocytes contributes to meta-inflammation and provide an overview on the involvement of the PI3K/Akt signaling pathway, and how its impairment contributes to the development of insulin resistance.
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Affiliation(s)
- Maricedes Acosta-Martinez
- Department of Physiology and Biophysics, Renaissance School of Medicine, Stony Brook University, Stony Brook, NY 11794, USA
| | - Maria Zulema Cabail
- Biological Science Department, State University of New York-College at Old Westbury, Old Westbury, NY 11568, USA
- Correspondence:
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28
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Langer HT, Cantley LC, Goncalves MD. Live cold to grow old? Thermogenesis to fight cancer. Cell Res 2022; 32:1042-1043. [PMID: 36085369 PMCID: PMC9715683 DOI: 10.1038/s41422-022-00723-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Affiliation(s)
- Henning T Langer
- Division of Endocrinology, Department of Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Lewis C Cantley
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Marcus D Goncalves
- Division of Endocrinology, Department of Medicine, Weill Cornell Medicine, New York, NY, USA.
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29
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Ge M, Huang L, Ma Y, Sun S, Wu L, Xu W, Yang D. MLN4924 Treatment Diminishes Excessive Lipid Storage in High-Fat Diet-Induced Non-Alcoholic Fatty Liver Disease (NAFLD) by Stimulating Hepatic Mitochondrial Fatty Acid Oxidation and Lipid Metabolites. Pharmaceutics 2022; 14:pharmaceutics14112460. [PMID: 36432651 PMCID: PMC9696831 DOI: 10.3390/pharmaceutics14112460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 11/03/2022] [Accepted: 11/11/2022] [Indexed: 11/17/2022] Open
Abstract
MLN4924 is a selective neddylation inhibitor that has shown great potential in treating several cancer and metabolic diseases, including obesity. However, it remains largely unknown whether MLN4924 has similar effect on non-alcoholic liver disease (NAFLD), which is closely associated with metabolic disorders. Here, we investigated the role of MLN4924 in NAFLD treatment and the underlying mechanism of the action using primary hepatocytes stimulated with free fatty acid, as well as high-fat diet (HFD)-induced NAFLD mouse models. We found that MLN4924 can inhibit the accumulation of lipid and reduce the expression of peroxisome proliferator-activated receptor γ (PPARγ), a key player in adipocyte differentiation and function in both in vivo and in vitro models. Moreover, we verified its important role in decreasing the synthesis and accumulation of fat in the liver, thus mitigating the development of NAFLD in the mouse model. The body weight and fat mass in MLN4924-treated animals were significantly reduced compared to the control group, while the metabolic activity, including O2 consumption, CO2 and heat production, also increased in these animals. Importantly, we demonstrated for the first time that MLN4924 can markedly boost mitochondrial fat acid oxidation (FAO) to alter liver lipid metabolism. Finally, we compared the metabolites between MLN4924-treated and untreated Huh7 cells after fatty acid induction using lipidomics methods and techniques. We found induction of several metabolites in the treated cells, including Beta-guanidinopropionic acid (b-GPA) and Fluphenazine, which was in accordance with the increase of FAO and metabolism. Together, our study provided a link between neddylation modification and energy metabolism, as well as evidence for targeting neddylation as an emerging therapeutic approach to tackle NAFLD.
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Affiliation(s)
- Mengxiao Ge
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Linlin Huang
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Yinjun Ma
- Key Laboratory of Metabolism and Molecular Medicine of the Ministry of Education, Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Shuangyi Sun
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Lijun Wu
- Department of Library, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Wei Xu
- Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
- Correspondence: (W.X.); (D.Y.)
| | - Dongqin Yang
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai 200040, China
- Correspondence: (W.X.); (D.Y.)
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30
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Wang O, Han L, Lin H, Tian M, Zhang S, Duan B, Chung S, Zhang C, Lian X, Wang Y, Lei Y. Fabricating 3-dimensional human brown adipose microtissues for transplantation studies. Bioact Mater 2022; 22:518-534. [PMID: 36330162 PMCID: PMC9619153 DOI: 10.1016/j.bioactmat.2022.10.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 10/06/2022] [Accepted: 10/18/2022] [Indexed: 11/13/2022] Open
Abstract
Transplanting cell cultured brown adipocytes (BAs) represents a promising approach to prevent and treat obesity (OB) and its associated metabolic disorders, including type 2 diabetes mellitus (T2DM). However, transplanted BAs have a very low survival rate in vivo. The enzymatic dissociation during the harvest of fully differentiated BAs also loses significant cells. There is a critical need for novel methods that can avoid cell death during cell preparation, transplantation, and in vivo. Here, we reported that preparing BAs as injectable microtissues could overcome the problem. We found that 3D culture promoted BA differentiation and UCP-1 expression, and the optimal initial cell aggregate size was 100 μm. The microtissues could be produced at large scales via 3D suspension assisted with a PEG hydrogel and could be cryopreserved. Fabricated microtissues could survive in vivo for long term. They alleviated body weight and fat gain and improved glucose tolerance and insulin sensitivity in high-fat diet (HFD)-induced OB and T2DM mice. Transplanted microtissues impacted multiple organs, secreted protein factors, and influenced the secretion of endogenous adipokines. To our best knowledge, this is the first report on fabricating human BA microtissues and showing their safety and efficacy in T2DM mice. The proposal of transplanting fabricated BA microtissues, the microtissue fabrication method, and the demonstration of efficacy in T2DM mice are all new. Our results show that engineered 3D human BA microtissues have considerable advantages in product scalability, storage, purity, safety, dosage, survival, and efficacy.
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Affiliation(s)
- Ou Wang
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, NE, USA
- Biomedical Engineering Program, University of Nebraska-Lincoln, NE, USA
| | - Li Han
- Department of Biomedical Engineering, Pennsylvania State University, PA, USA
| | - Haishuang Lin
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, NE, USA
| | - Mingmei Tian
- China Novartis Institutes for BioMedical Research Co., Ltd., Beijing, China
| | - Shuyang Zhang
- Department of Chemistry, University of Nebraska-Lincoln, NE, USA
| | - Bin Duan
- Mary & Dick Holland Regenerative Medicine Program and Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, USA
| | - Soonkyu Chung
- Department of Nutrition, University of Massachusetts, Amherst, MA, USA
| | - Chi Zhang
- School of Biological Science, University of Nebraska-Lincoln, NE, USA
| | - Xiaojun Lian
- Department of Biomedical Engineering, Pennsylvania State University, PA, USA
| | - Yong Wang
- Department of Biomedical Engineering, Pennsylvania State University, PA, USA
| | - Yuguo Lei
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, NE, USA
- Department of Biomedical Engineering, Pennsylvania State University, PA, USA
- Huck Institutes of the Life Sciences, Pennsylvania State University, PA, USA
- Corresponding author. The Pennsylvania State University, PA, USA.
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31
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Boulet N, Briot A, Galitzky J, Bouloumié A. The Sexual Dimorphism of Human Adipose Depots. Biomedicines 2022; 10:2615. [PMID: 36289874 PMCID: PMC9599294 DOI: 10.3390/biomedicines10102615] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 10/11/2022] [Accepted: 10/13/2022] [Indexed: 08/21/2023] Open
Abstract
The amount and the distribution of body fat exhibit trajectories that are sex- and human species-specific and both are determinants for health. The enhanced accumulation of fat in the truncal part of the body as a risk factor for cardiovascular and metabolic diseases is well supported by epidemiological studies. In addition, a possible independent protective role of the gluteofemoral fat compartment and of the brown adipose tissue is emerging. The present narrative review summarizes the current knowledge on sexual dimorphism in fat depot amount and repartition and consequences on cardiometabolic and reproductive health. The drivers of the sex differences and fat depot repartition, considered to be the results of complex interactions between sex determination pathways determined by the sex chromosome composition, genetic variability, sex hormones and the environment, are discussed. Finally, the inter- and intra-depot heterogeneity in adipocytes and progenitors, emphasized recently by unbiased large-scale approaches, is highlighted.
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Affiliation(s)
| | | | | | - Anne Bouloumié
- Inserm, Unité Mixte de Recherche (UMR) 1297, Team 1, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Université de Toulouse, F-31432 Toulouse, France
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32
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Plucińska K, Zaman S, Cohen P. Fructose: Not sweet enough for brown fat? Cell Rep Med 2022; 3:100747. [PMID: 36130482 PMCID: PMC9512691 DOI: 10.1016/j.xcrm.2022.100747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In a randomized crossover study in humans, high fructose feeding reduced glucose uptake in brown fat without affecting the tissue’s oxidative capacity. These effects were independent of alterations in the gut microbiome.
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33
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High-fructose feeding suppresses cold-stimulated brown adipose tissue glucose uptake independently of changes in thermogenesis and the gut microbiome. Cell Rep Med 2022; 3:100742. [PMID: 36130480 PMCID: PMC9512695 DOI: 10.1016/j.xcrm.2022.100742] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 06/14/2022] [Accepted: 08/23/2022] [Indexed: 12/30/2022]
Abstract
Diets rich in added sugars are associated with metabolic diseases, and studies have shown a link between these pathologies and changes in the microbiome. Given the reported associations in animal models between the microbiome and brown adipose tissue (BAT) function, and the alterations in the microbiome induced by high-glucose or high-fructose diets, we investigated the potential causal link between high-glucose or -fructose diets and BAT dysfunction in humans. Primary outcomes are changes in BAT cold-induced thermogenesis and the fecal microbiome (clinicaltrials.gov, NCT03188835). We show that BAT glucose uptake, but not thermogenesis, is impaired by a high-fructose but not high-glucose diet, in the absence of changes in the gastrointestinal microbiome. We conclude that decreased BAT glucose metabolism occurs earlier than other pathophysiological abnormalities during fructose overconsumption in humans. This is a potential confounding factor for studies relying on 18F-FDG to assess BAT thermogenesis. Fructose overfeeding decreases brown adipose tissue glucose metabolism These changes occur independently of oxidative metabolism No change is observed with glucose overfeeding The gut microbiome is not affected by fructose/glucose overfeeding
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34
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Ying Z, Tramper N, Zhou E, Boon MR, Rensen PCN, Kooijman S. Role of thermogenic adipose tissue in lipid metabolism and atherosclerotic cardiovascular disease: lessons from studies in mice and humans. Cardiovasc Res 2022; 119:905-918. [PMID: 35944189 PMCID: PMC10153643 DOI: 10.1093/cvr/cvac131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 05/09/2022] [Accepted: 06/02/2022] [Indexed: 11/12/2022] Open
Abstract
Brown adipocytes within brown adipose tissue (BAT) and beige adipocytes within white adipose tissue dissipate nutritional energy as heat. Studies in mice have shown that activation of thermogenesis in brown and beige adipocytes enhances the lipolytic processing of triglyceride-rich lipoproteins (TRLs) in plasma to supply these adipocytes with fatty acids for oxidation. This process results in formation of TRL remnants that are removed from the circulation through binding of apolipoprotein E (ApoE) on their surface to the low-density lipoprotein receptor (LDLR) on hepatocytes, followed by internalization. Concomitantly, lipolytic processing of circulating TRLs leads to generation of excess surface phospholipids that are transferred to nascent high-density lipoproteins (HDL), increasing their capacity for reverse cholesterol transport. Activation of thermogenic adipocytes thus lowers circulating triglycerides and non-HDL-cholesterol, while it increases HDL-cholesterol. The combined effect is protection from atherosclerosis development, which becomes evident in humanized mouse models with an intact ApoE-LDLR clearance pathway only, and is additive to the effects of classical lipid-lowering drugs including statins and proprotein convertase subtilisin/kexin type 9 inhibitors. A large recent study revealed that the presence of metabolically active BAT in humans is associated with lower triglycerides, higher HDL-cholesterol and lower risk of cardiovascular diseases. This narrative review aims to provide leads for further exploration of thermogenic adipose tissue as a therapeutic target. To this end, we describe the latest knowledge on the role of BAT in lipoprotein metabolism and address, for example, the discovery of the β2-adrenergic receptor as the dominant adrenergic receptor in human thermogenic adipocytes.
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Affiliation(s)
- Zhixiong Ying
- Department of Medicine, Division of Endocrinology, Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Naomi Tramper
- Department of Medicine, Division of Endocrinology, Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Enchen Zhou
- Department of Medicine, Division of Endocrinology, Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Mariëtte R Boon
- Department of Medicine, Division of Endocrinology, Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
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Burl RB, Rondini EA, Wei H, Pique-Regi R, Granneman JG. Deconstructing cold-induced brown adipocyte neogenesis in mice. eLife 2022; 11:80167. [PMID: 35848799 PMCID: PMC9348851 DOI: 10.7554/elife.80167] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 07/15/2022] [Indexed: 11/21/2022] Open
Abstract
Cold exposure triggers neogenesis in classic interscapular brown adipose tissue (iBAT) that involves activation of β1-adrenergic receptors, proliferation of PDGFRA+ adipose tissue stromal cells (ASCs), and recruitment of immune cells whose phenotypes are presently unknown. Single-cell RNA-sequencing (scRNA-seq) in mice identified three ASC subpopulations that occupied distinct tissue locations. Of these, interstitial ASC1 were found to be direct precursors of new brown adipocytes (BAs). Surprisingly, knockout of β1-adrenergic receptors in ASCs did not prevent cold-induced neogenesis, whereas pharmacological activation of the β3-adrenergic receptor on BAs was sufficient, suggesting that signals derived from mature BAs indirectly trigger ASC proliferation and differentiation. In this regard, cold exposure induced the delayed appearance of multiple macrophage and dendritic cell populations whose recruitment strongly correlated with the onset and magnitude of neogenesis across diverse experimental conditions. High-resolution immunofluorescence and single-molecule fluorescence in situ hybridization demonstrated that cold-induced neogenesis involves dynamic interactions between ASC1 and recruited immune cells that occur on the micrometer scale in distinct tissue regions. Our results indicate that neogenesis is not a reflexive response of progenitors to β-adrenergic signaling, but rather is a complex adaptive response to elevated metabolic demand within brown adipocytes.
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Affiliation(s)
- Rayanne B Burl
- Center for Molecular Medicine and Genetics, Wayne State University, Detroit, United States
| | - Elizabeth Ann Rondini
- Center for Molecular Medicine and Genetics, Wayne State University, Detroit, United States
| | - Hongguang Wei
- Center for Molecular Medicine and Genetics, Wayne State University, Detroit, United States
| | - Roger Pique-Regi
- Center for Molecular Medicine and Genetics, Wayne State University, Detroit, United States
| | - James G Granneman
- Center for Integrative Metabolic and Endocrine Research, Wayne State University, Detroit, United States
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Acosta FM, Sanchez-Delgado G, Martinez-Tellez B, Osuna-Prieto FJ, Mendez-Gutierrez A, Aguilera CM, Gil A, Llamas-Elvira JM, Ruiz JR. A larger brown fat volume and lower radiodensity are related to a greater cardiometabolic risk, especially in young men. Eur J Endocrinol 2022; 187:171-183. [PMID: 36149276 DOI: 10.1530/eje-22-0130] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 05/11/2022] [Indexed: 11/08/2022]
Abstract
OBJECTIVES Brown adipose tissue (BAT) is important in the maintenance of cardiometabolic health in rodents. Recent reports appear to suggest the same in humans, although if this is true remains elusive partly because of the methodological bias that affected previous research. This cross-sectional work reports the relationships of cold-induced BAT volume, activity (peak standardized uptake, SUVpeak), and mean radiodensity (an inverse proxy of the triacylglycerols content) with the cardiometabolic and inflammatory profile of 131 young adults, and how these relationships are influenced by sex and body weight. DESIGN This is a cross-sectional study. METHODS Subjects underwent personalized cold exposure for 2 h to activate BAT, followed by static 18F-fluorodeoxyglucose PET-CT scanning to determine BAT variables. Information on cardiometabolic risk (CMR) and inflammatory markers was gathered, and a CMR score and fatty liver index (FLI) were calculated. RESULTS In men, BAT volume was positively related to homocysteine and liver damage markers concentrations (independently of BMI and seasonality) and the FLI (all P ≤ 0.05). In men, BAT mean radiodensity was negatively related to the glucose and insulin concentrations, alanine aminotransferase activity, insulin resistance, total cholesterol/HDL-C, LDL-C/HDL-C, the CMR score, and the FLI (all P ≤ 0.02). In women, it was only negatively related to the FLI (P < 0.001). These associations were driven by the results for the overweight and obese subjects. No relationship was seen between BAT and inflammatory markers (P > 0.05). CONCLUSIONS A larger BAT volume and a lower BAT mean radiodensity are related to a higher CMR, especially in young men, which may support that BAT acts as a compensatory organ in states of metabolic disruption.
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Affiliation(s)
- Francisco M Acosta
- PROFITH 'PRO-moting FITness and Health Through Physical Activity' Research Group, Department of Physical and Sports Education, Sport and Health University Research Institute (iMUDS), Faculty of Sports Science, University of Granada, Granada, Spain
- Turku PET Centre, University of Turku, Turku, Finland
- Turku PET Centre, Turku University Hospital, Turku, Finland
- InFLAMES Research Flagship Center, University of Turku, Turku, Finland
| | - Guillermo Sanchez-Delgado
- PROFITH 'PRO-moting FITness and Health Through Physical Activity' Research Group, Department of Physical and Sports Education, Sport and Health University Research Institute (iMUDS), Faculty of Sports Science, University of Granada, Granada, Spain
- Pennington Biomedical Research Center, Baton Rouge, Louisiana, USA
| | - Borja Martinez-Tellez
- PROFITH 'PRO-moting FITness and Health Through Physical Activity' Research Group, Department of Physical and Sports Education, Sport and Health University Research Institute (iMUDS), Faculty of Sports Science, University of Granada, Granada, Spain
- Division of Endocrinology, and Einthoven Laboratory for Experimental Vascular Medicine, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Francisco J Osuna-Prieto
- PROFITH 'PRO-moting FITness and Health Through Physical Activity' Research Group, Department of Physical and Sports Education, Sport and Health University Research Institute (iMUDS), Faculty of Sports Science, University of Granada, Granada, Spain
- Department of Analytical Chemistry, University of Granada, Granada, Spain
- Research and Development of Functional Food Center (CIDAF), Granada, Spain
| | - Andrea Mendez-Gutierrez
- Department of Biochemistry and Molecular Biology II, 'José Mataix Verdú' Institute of Nutrition and Food Technology (INYTA), Biomedical Research Centre (CIBM), University of Granada, Granada, Spain
- Instituto de Investigación Biosanitaria, ibs.Granada, Granada, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBEROBNISCIII), Madrid, Spain
| | - Concepcion M Aguilera
- Department of Biochemistry and Molecular Biology II, 'José Mataix Verdú' Institute of Nutrition and Food Technology (INYTA), Biomedical Research Centre (CIBM), University of Granada, Granada, Spain
- Instituto de Investigación Biosanitaria, ibs.Granada, Granada, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBEROBNISCIII), Madrid, Spain
| | - Angel Gil
- Department of Biochemistry and Molecular Biology II, 'José Mataix Verdú' Institute of Nutrition and Food Technology (INYTA), Biomedical Research Centre (CIBM), University of Granada, Granada, Spain
- Instituto de Investigación Biosanitaria, ibs.Granada, Granada, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBEROBNISCIII), Madrid, Spain
| | - Jose M Llamas-Elvira
- Nuclear Medicine Services, 'Virgen de las Nieves' University Hospital, Granada, Spain
| | - Jonatan R Ruiz
- PROFITH 'PRO-moting FITness and Health Through Physical Activity' Research Group, Department of Physical and Sports Education, Sport and Health University Research Institute (iMUDS), Faculty of Sports Science, University of Granada, Granada, Spain
- Instituto de Investigación Biosanitaria, ibs.Granada, Granada, Spain
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Takeda Y, Dai P. Chronic Fatty Acid Depletion Induces Uncoupling Protein 1 (UCP1) Expression to Coordinate Mitochondrial Inducible Proton Leak in a Human-Brown-Adipocyte Model. Cells 2022; 11:cells11132038. [PMID: 35805122 PMCID: PMC9265531 DOI: 10.3390/cells11132038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 06/23/2022] [Accepted: 06/25/2022] [Indexed: 11/17/2022] Open
Abstract
Thermogenic brown fat contributes to metabolic health in adult humans. Obese conditions are known to repress adipose-tissue browning and its activity. Herein, we found that chronic fatty acid (FA) depletion induced uncoupling protein 1 (UCP1) expression in the chemical-compound-induced brown adipocytes (ciBAs). The ciBAs, converted from human dermal fibroblasts under FA-free conditions, had low intracellular triglyceride levels and strongly activated UCP1 expression. Prolonged treatment with carnitine also reduced triglyceride accumulation and induced UCP1 expression. Transcriptome analysis revealed that the UCP1 induction was accompanied by the activation of lipid metabolic genes. The FA-depleted conditions repressed mitochondrial proton-leak activity and mitochondrial membrane potential (MMP), despite maintaining a high UCP1 expression. The evidence suggested that UCP1 expression was induced to compensate for the proton-leak activity under low MMP. Our study reports a regulatory mechanism underlying UCP1 expression and mitochondrial-energy status in human brown adipocytes under different nutritional conditions.
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Affiliation(s)
- Yukimasa Takeda
- Correspondence: (Y.T.); (P.D.); Tel.: +81-75-251-5444 (Y.T.); +81-75-251-5135 (P.D.)
| | - Ping Dai
- Correspondence: (Y.T.); (P.D.); Tel.: +81-75-251-5444 (Y.T.); +81-75-251-5135 (P.D.)
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38
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Straat ME, Martinez-Tellez B, Sardjoe Mishre A, Verkleij MMA, Kemmeren M, Pelsma ICM, Alcantara JMA, Mendez-Gutierrez A, Kooijman S, Boon MR, Rensen PCN. Cold-Induced Thermogenesis Shows a Diurnal Variation That Unfolds Differently in Males and Females. J Clin Endocrinol Metab 2022; 107:1626-1635. [PMID: 35176767 PMCID: PMC9113803 DOI: 10.1210/clinem/dgac094] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Indexed: 11/21/2022]
Abstract
CONTEXT Cold exposure mobilizes lipids to feed thermogenic processes in organs, including brown adipose tissue (BAT). In rodents, BAT metabolic activity exhibits a diurnal rhythm, which is highest at the start of the wakeful period. OBJECTIVE We investigated whether cold-induced thermogenesis displays diurnal variation in humans and differs between the sexes. METHODS This randomized crossover study included 24 young and lean male (n = 12) and female (n = 12) participants who underwent 2.5-hour personalized cooling using water-perfused mattresses in the morning (7:45 am) and evening (7:45 pm), with 1 day in between. We measured energy expenditure (EE) and supraclavicular skin temperature in response to cold exposure. RESULTS In males, cold-induced EE was higher in the morning than in the evening (+54% ± 10% vs +30% ± 7%; P = 0.05) but did not differ between morning and evening in females (+37% ± 9% vs +30% ± 10%; P = 0.42). Only in males, supraclavicular skin temperature upon cold increased more in morning than evening (+0.2 ± 0.1 °C vs -0.2 ± 0.2 °C; P = 0.05). In males, circulating free fatty acid (FFA) levels were increased after morning cold exposure, but not evening (+90% ± 18% vs +9% ± 8%; P < 0.001). In females, circulating FFA (+94% ± 21% vs +20% ± 5%; P = 0.006), but also triglycerides (+42% ± 5% vs +29% ± 4%, P = 0.01) and cholesterol levels (+17% ± 2% vs 11% ± 2%; P = 0.05) were more increased after cold exposure in morning than in evening. CONCLUSION Cold-induced thermogenesis is higher in morning than evening in males; however, lipid metabolism is more modulated in the morning than the evening in females.
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Affiliation(s)
- Maaike E Straat
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
| | - Borja Martinez-Tellez
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
| | - Aashley Sardjoe Mishre
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
- Department of Radiology, Leiden University Medical Center, ZA, Leiden, the Netherlands
| | - Magdalena M A Verkleij
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
| | - Mirjam Kemmeren
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
| | - Iris C M Pelsma
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
| | - Juan M A Alcantara
- PROFITH “PROmoting FITness and Health Through Physical Activity” Research Group, Sport and Health University Research Institute (iMUDS), Department of Physical and Sports Education, Faculty of Sport Sciences, University of Granada, Granada, Spain
| | - Andrea Mendez-Gutierrez
- Department of Biochemistry and Molecular Biology II, “José Mataix Verdú” Institute of Nutrition and Food Technology, Center of Biomedical Research, University of Granada, Granada, Spain
- Biohealth Research Institute in Granada (ibs.GRANADA), Granada, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Madrid, Spain
| | - Sander Kooijman
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
| | - Mariëtte R Boon
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
| | - Patrick C N Rensen
- Division of Endocrinology, Department of Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, ZA, Leiden, the Netherlands
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Zheng H, Ji H, Fan K, Xu H, Huang Y, Zheng Y, Xu Q, Li C, Zhao L, Li Y, Gao H. Targeting Gut Microbiota and Host Metabolism with Dendrobium officinale Dietary Fiber to Prevent Obesity and Improve Glucose Homeostasis in Diet-Induced Obese Mice. Mol Nutr Food Res 2022; 66:e2100772. [PMID: 35225418 DOI: 10.1002/mnfr.202100772] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 12/29/2021] [Indexed: 12/26/2022]
Abstract
SCOPE Obesity is becoming a major public health problem due to excess dietary fat intake. Dendrobium officinale (D. officinale) is a medicine food homology plant and exerts multiple health-promoting effects. However, its antiobesity effects and the potential mechanisms remain unclear. METHODS AND RESULTS High-fat diet (HFD)-fed mice are administered D. officinale dietary fiber (DODF) daily by gavage for 11 weeks. The results show that treatment with DODF alleviates obesity, liver steatosis, inflammation, and oxidant stress in HFD-induced obese mice. Improved glucose homeostasis in obese mice after DODF treatment is achieved by enhancing insulin pathway and hepatic glycogen synthesis. DODF restructures the gut microbiota in obese mice by decreasing the relative abundance of Bilophila and increasing the relative abundances of Akkermansia, Bifidobacterium, and Muribaculum. Also, DODF reshapes the metabolic phenotype of obese mice as indicated by up-regulating energy metabolism, increasing acetate and taurine, and reducing serum low density/very low density lipoproteins (LDL/VLDL). These beneficial effects are partly transferred by FMT, implying the gut microbiota as a target for the protective effect of DODF on obesity-related symptoms. CONCLUSION The results suggest that DODF can be used as a novel prebiotics to maintain the gut microbial homeostasis and improve metabolic health, preventing obesity and related metabolic syndrome.
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Affiliation(s)
- Hong Zheng
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China.,Department of Endocrinology, Pingyang Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325400, China
| | - Hui Ji
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Kai Fan
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Hangying Xu
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Yinli Huang
- Department of Endocrinology, Pingyang Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325400, China
| | - Yafei Zheng
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Qingqing Xu
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Chen Li
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Liangcai Zhao
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Yuping Li
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000, China
| | - Hongchang Gao
- Institute of Metabonomics & Medical NMR, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325035, China.,Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000, China
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40
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Kulterer OC, Herz CT, Prager M, Schmöltzer C, Langer FB, Prager G, Marculescu R, Kautzky-Willer A, Hacker M, Haug AR, Kiefer FW. Brown Adipose Tissue Prevalence Is Lower in Obesity but Its Metabolic Activity Is Intact. Front Endocrinol (Lausanne) 2022; 13:858417. [PMID: 35432192 PMCID: PMC9009254 DOI: 10.3389/fendo.2022.858417] [Citation(s) in RCA: 2] [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: 01/19/2022] [Accepted: 02/21/2022] [Indexed: 01/09/2023] Open
Abstract
Due to its high metabolic activity, brown adipose tissue (BAT) has become a promising target for the development of novel treatment concepts for metabolic disease. Despite several reports of a negative association between the presence of active BAT and obesity, very little is known about the quantitative and qualitative differences of BAT in lean and obese individuals. Systematic studies directly comparing cold-induced BAT activity in leanness and obesity are currently lacking. Here we studied BAT mass and function in 31 lean and 64 obese men and women. After a standardized cooling protocol using a water-perfused vest, 18F-FDG-positron emission tomography/computed tomography scans were performed, and BAT was delineated using lean body-mass adjusted standardized uptake value (SUV) thresholds in anatomic regions with fat radiodensity. Cold-induced thermogenesis (CIT), a functional readout of BAT activity, was quantified by indirect calorimetry. Active BAT was present in a significantly higher proportion of lean than obese individuals (58% vs. 33%, p=0.019). In these participants with active BAT, however, BAT volume and activity did not differ between leanness and obesity. Accordingly, CIT was similar in both weight groups. BAT metrics were not related to adiposity or total fat mass per se. However, in obese participants a strong negative correlation existed between visceral adipose tissue and BAT volume, 18F-FDG uptake and CIT. In summary, despite a significantly lower prevalence of BAT, the metabolic activity and thermogenic capacity of BAT appears to be still intact in obesity and is inversely associated with visceral fat mass.
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Affiliation(s)
- Oana C. Kulterer
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Carsten T. Herz
- Division of Nephrology and Dialysis, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Marlene Prager
- Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Christoph Schmöltzer
- Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Felix B. Langer
- Division of Visceral Surgery, Department of Surgery, Medical University of Vienna, Vienna, Austria
| | - Gerhard Prager
- Division of Visceral Surgery, Department of Surgery, Medical University of Vienna, Vienna, Austria
| | - Rodrig Marculescu
- Division of Medical-Chemical Laboratory Diagnostics, Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Alexandra Kautzky-Willer
- Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Marcus Hacker
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Alexander R. Haug
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Florian W. Kiefer
- Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
- *Correspondence: Florian W. Kiefer,
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41
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Pan R, Chen Y. Latest Advancements on Combating Obesity by Targeting Human Brown/Beige Adipose Tissues. Front Endocrinol (Lausanne) 2022; 13:884944. [PMID: 35600577 PMCID: PMC9114493 DOI: 10.3389/fendo.2022.884944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 03/28/2022] [Indexed: 12/15/2022] Open
Abstract
Obesity is defined as overaccumulation of white adipose tissue in the body, mainly under the skin (subcutaneous adiposity) or in the abdominal cavity (visceral adiposity). It could be the origin of various metabolic disorders including hypertension, hyperlipidemia, type 2 diabetes, cardiovascular diseases etc. Active adipose tissue was discovered in humans through 18F-fluorodeoxyglucose Positron Emission Tomography coupled with Computer Tomography (18F FDG-PET/CT), which was initially performed for tumor scanning. Since human active adipose tissue is probably composed of brown and beige adipose tissues and they burn white adipose tissue to generate heat, targeting human brown/beige adipose tissue to induce their thermogenic function is considered significant to combat obesity. In this review, we describe the latest advancements on promising therapeutic strategies to combat obesity by targeting human thermogenic adipose tissues to achieve further metabolic balance in humans.
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Affiliation(s)
- Ruping Pan
- Department of nuclear medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yong Chen
- Department of Endocrinology, Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Branch of National Clinical Research Center for Metabolic Diseases, Hubei, China
- Laboratory of Endocrinology and Metabolism, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China
- *Correspondence: Yong Chen,
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42
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Monfort-Pires M, Regeni-Silva G, Dadson P, Nogueira GA, U-Din M, Ferreira SRG, Sapienza MT, Virtanen K, Velloso LA. Brown fat triglyceride content is associated with cardiovascular risk markers in adults from a tropical region. Front Endocrinol (Lausanne) 2022; 13:919588. [PMID: 35928901 PMCID: PMC9343995 DOI: 10.3389/fendo.2022.919588] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 06/28/2022] [Indexed: 11/13/2022] Open
Abstract
Brown adipose tissue (BAT) is regarded as an interesting potential target for the treatment of obesity, diabetes, and cardiovascular diseases, and the detailed characterization of its structural and functional phenotype could enable an advance in these fields. Most studies evaluating BAT structure and function were performed in temperate climate regions, and we are yet to know how these findings apply to the 40% of the world's population living in tropical areas. Here, we used 18F-fluorodeoxyglucose positron emission tomography - magnetic resonance imaging to evaluate BAT in 45 lean, overweight, and obese volunteers living in a tropical area in Southeast Brazil. We aimed at investigating the associations between BAT activity, volume, metabolic activity, and BAT content of triglycerides with adiposity and cardiovascular risk markers in a sample of adults living in a tropical area and we showed that BAT glucose uptake is not correlated with leanness; instead, BAT triglyceride content is correlated with visceral adiposity and markers of cardiovascular risk. This study expands knowledge regarding the structure and function of BAT in people living in tropical areas. In addition, we provide evidence that BAT triglyceride content could be an interesting marker of cardiovascular risk.
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Affiliation(s)
- Milena Monfort-Pires
- Laboratory of Cell Signaling, Obesity and Comorbidities Research Center, State University ofCampinas (UNICAMP), Campinas, Brazil
- *Correspondence: Milena Monfort-Pires, ; Licio A. Velloso,
| | - Giulianna Regeni-Silva
- Department of Nutrition, School of Public Health -University of São Paulo, São Paulo, Brazil
| | - Prince Dadson
- Turku PET Centre, University of Turku, Turku, Finland
| | - Guilherme A. Nogueira
- Laboratory of Cell Signaling, Obesity and Comorbidities Research Center, State University ofCampinas (UNICAMP), Campinas, Brazil
| | - Mueez U-Din
- Turku PET Centre, University of Turku, Turku, Finland
- Turku PET Centre, Turku University Hospital, Turku, Finland
| | - Sandra R. G. Ferreira
- Department of Epidemiology, School of Public Health-University of São Paulo, São Paulo, Brazil
| | - Marcelo Tatit Sapienza
- Division of Nuclear Medicine, Department of Radiology and Oncology, Medical School of University of São Paulo (FMUSP), São Paulo, Finland
| | - Kirsi A. Virtanen
- Turku PET Centre, University of Turku, Turku, Finland
- Turku PET Centre, Turku University Hospital, Turku, Finland
- Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland (UEF), Kuopio, Finland
| | - Licio A. Velloso
- Laboratory of Cell Signaling, Obesity and Comorbidities Research Center, State University ofCampinas (UNICAMP), Campinas, Brazil
- *Correspondence: Milena Monfort-Pires, ; Licio A. Velloso,
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Wade G, McGahee A, Ntambi JM, Simcox J. Lipid Transport in Brown Adipocyte Thermogenesis. Front Physiol 2021; 12:787535. [PMID: 35002769 PMCID: PMC8733649 DOI: 10.3389/fphys.2021.787535] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 12/02/2021] [Indexed: 12/30/2022] Open
Abstract
Non-shivering thermogenesis is an energy demanding process that primarily occurs in brown and beige adipose tissue. Beyond regulating body temperature, these thermogenic adipocytes regulate systemic glucose and lipid homeostasis. Historically, research on thermogenic adipocytes has focused on glycolytic metabolism due to the discovery of active brown adipose tissue in adult humans through glucose uptake imaging. The importance of lipids in non-shivering thermogenesis has more recently been appreciated. Uptake of circulating lipids into thermogenic adipocytes is necessary for body temperature regulation and whole-body lipid homeostasis. A wide array of circulating lipids contribute to thermogenic potential including free fatty acids, triglycerides, and acylcarnitines. This review will summarize the mechanisms and regulation of lipid uptake into brown adipose tissue including protein-mediated uptake, lipoprotein lipase activity, endocytosis, vesicle packaging, and lipid chaperones. We will also address existing gaps in knowledge for cold induced lipid uptake into thermogenic adipose tissue.
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Affiliation(s)
| | | | | | - Judith Simcox
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, United States
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Recent Advances in Adipose Tissue Dysfunction and Its Role in the Pathogenesis of Non-Alcoholic Fatty Liver Disease. Cells 2021; 10:cells10123300. [PMID: 34943809 PMCID: PMC8699427 DOI: 10.3390/cells10123300] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 11/09/2021] [Accepted: 11/23/2021] [Indexed: 12/12/2022] Open
Abstract
Obesity is a serious ongoing health problem that significantly increases the incidence of nonalcoholic fatty liver disease (NAFLD). During obesity, adipose tissue dysfunction is obvious and characterized by increased fat deposition (adiposity) and chronic low-grade inflammation. The latter has been implicated to critically promote the development and progression of NAFLD, whose advanced form non-alcoholic steatohepatitis (NASH) is considered one of the most common causes of terminal liver diseases. This review summarizes the current knowledge on obesity-related adipose dysfunction and its roles in the pathogenesis of hepatic steatosis and inflammation, as well as liver fibrosis. A better understanding of the crosstalk between adipose tissue and liver under obesity is essential for the development of new and improved preventive and/or therapeutic approaches for managing NAFLD.
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Chondronikola M, Sidossis LS. Human brown fat, adiposity, and cardiometabolic health: New pieces to the puzzle. Cell Rep Med 2021; 2:100356. [PMID: 34337568 PMCID: PMC8324490 DOI: 10.1016/j.xcrm.2021.100356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Brown adipose tissue (BAT) is an emerging target against obesity and its related metabolic diseases. Wibmer et al.1 recently reported that human BAT is associated with a healthier fat distribution and improved cardiometabolic health independent of adiposity and fat distribution.
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Affiliation(s)
- Maria Chondronikola
- Department of Nutrition, University of California, Davis, Davis, CA, USA
- Department of Nutritional Sciences and Dietetics, Harokopio University of Athens, Greece
| | - Labros S. Sidossis
- Department of Nutritional Sciences and Dietetics, Harokopio University of Athens, Greece
- Department of Kinesiology and Health, Rutgers University, New Brunswick, NJ, USA
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Mohajer N, Du CY, Checkcinco C, Blumberg B. Obesogens: How They Are Identified and Molecular Mechanisms Underlying Their Action. Front Endocrinol (Lausanne) 2021; 12:780888. [PMID: 34899613 PMCID: PMC8655100 DOI: 10.3389/fendo.2021.780888] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 10/23/2021] [Indexed: 12/11/2022] Open
Abstract
Adult and childhood obesity have reached pandemic level proportions. The idea that caloric excess and insufficient levels of physical activity leads to obesity is a commonly accepted answer for unwanted weight gain. This paradigm offers an inconclusive explanation as the world continually moves towards an unhealthier and heavier existence irrespective of energy balance. Endocrine disrupting chemicals (EDCs) are chemicals that resemble natural hormones and disrupt endocrine function by interfering with the body's endogenous hormones. A subset of EDCs called obesogens have been found to cause metabolic disruptions such as increased fat storage, in vivo. Obesogens act on the metabolic system through multiple avenues and have been found to affect the homeostasis of a variety of systems such as the gut microbiome and adipose tissue functioning. Obesogenic compounds have been shown to cause metabolic disturbances later in life that can even pass into multiple future generations, post exposure. The rising rates of obesity and related metabolic disease are demanding increasing attention on chemical screening efforts and worldwide preventative strategies to keep the public and future generations safe. This review addresses the most current findings on known obesogens and their effects on the metabolic system, the mechanisms of action through which they act upon, and the screening efforts through which they were identified with. The interplay between obesogens, brown adipose tissue, and the gut microbiome are major topics that will be covered.
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Affiliation(s)
- Nicole Mohajer
- Deparment of Pharmaceutical Sciences, University of California, Irvine, CA, United States
| | - Chrislyn Y. Du
- Deparment of Developmental and Cell Biology, University of California, Irvine, CA, United States
| | - Christian Checkcinco
- Deparment of Developmental and Cell Biology, University of California, Irvine, CA, United States
| | - Bruce Blumberg
- Deparment of Pharmaceutical Sciences, University of California, Irvine, CA, United States
- Deparment of Developmental and Cell Biology, University of California, Irvine, CA, United States
- Deparment of Biomedical Engineering, University of California, Irvine, CA, United States
- *Correspondence: Bruce Blumberg,
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