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Himbert C, Delphan M, Scherer D, Bowers LW, Hursting S, Ulrich CM. Signals from the Adipose Microenvironment and the Obesity-Cancer Link-A Systematic Review. Cancer Prev Res (Phila) 2018; 10:494-506. [PMID: 28864539 DOI: 10.1158/1940-6207.capr-16-0322] [Citation(s) in RCA: 118] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 06/06/2017] [Accepted: 07/11/2017] [Indexed: 12/13/2022]
Abstract
Obesity and its associated metabolic dysregulation are established risk factors for many cancers. However, the biologic mechanisms underlying this relationship remain incompletely understood. Given the rising rates of both obesity and cancer worldwide, and the challenges for many people to lose excess adipose tissue, a systematic approach to identify potential molecular and metabolic targets is needed to develop effective mechanism-based strategies for the prevention and control of obesity-driven cancer. Epidemiologic, clinical, and preclinical data suggest that within the growth-promoting, proinflammatory microenvironment accompanying obesity, crosstalk between adipose tissue (comprised of adipocytes, macrophages and other cells) and cancer-prone cells may occur via obesity-associated hormones, cytokines, and other mediators that have been linked to increased cancer risk and/or progression. We report here a systematic review on the direct "crosstalk" between adipose tissue and carcinomas in humans. We identified 4,641 articles with n = 20 human clinical studies, which are summarized as: (i) breast (n = 7); (ii) colorectal (n = 4); (iii) esophageal (n = 2); (iv) esophageal/colorectal (n = 1); (v) endometrial (n = 1); (vi) prostate (n = 4); and (vii) ear-nose-throat (ENT) cancer (n = 1). Findings from these clinical studies reinforce preclinical data and suggest organ-dependent crosstalk between adipose tissue and carcinomas via VEGF, IL6, TNFα, and other mechanisms. Moreover, visceral white adipose tissue plays a more central role, as it is more bioenergetically active and is associated with a more procancer secretome than subcutaneous adipose tissue. Efforts to eavesdrop and ultimately interfere with this cancer-enhancing crosstalk may lead to new targets and strategies for decreasing the burden of obesity-related cancers. Cancer Prev Res; 10(9); 494-506. ©2017 AACR.
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Affiliation(s)
- Caroline Himbert
- Huntsman Cancer Institute, Population Sciences, Salt Lake City, Utah.,Department of Population Health Sciences, University of Utah, Salt Lake City, Utah
| | - Mahmoud Delphan
- Huntsman Cancer Institute, Population Sciences, Salt Lake City, Utah.,Department of Population Health Sciences, University of Utah, Salt Lake City, Utah.,Exercise Immunology, Physical Education and Sport Sciences Department, Tarbiat Modares University, Tehran, Iran
| | - Dominique Scherer
- Institute of Medical Biometry and Informatics, University of Heidelberg, Heidelberg, Germany
| | - Laura W Bowers
- Department of Nutrition, University of North Carolina, Chapel Hill, North Carolina
| | - Stephen Hursting
- Department of Nutrition, University of North Carolina, Chapel Hill, North Carolina
| | - Cornelia M Ulrich
- Huntsman Cancer Institute, Population Sciences, Salt Lake City, Utah. .,Department of Population Health Sciences, University of Utah, Salt Lake City, Utah
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202
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Singh AM, Dalton S. What Can 'Brown-ing' Do For You? Trends Endocrinol Metab 2018; 29:349-359. [PMID: 29606342 PMCID: PMC5937921 DOI: 10.1016/j.tem.2018.03.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 02/27/2018] [Accepted: 03/01/2018] [Indexed: 12/31/2022]
Abstract
Human stem cell-based models of thermogenic adipocytes provide an opportunity for the establishment of new therapeutics, modeling of disease mechanisms, and understanding of development. Pluripotent stem cells, adipose-derived stem cells/preadipocytes, and programming-reprogramming-based approaches have been used to develop cell-based platforms for drug screening and transplantable therapeutics in the metabolic disease arena. Here we provide a detailed overview of these approaches, the latest advances in this field, and the opportunities and shortcomings they present. Moreover, we comment on how stem-cell-based platforms can be best utilized in the future for the treatment and understanding of metabolic diseases, including type 2 diabetes and associated medical issues such as obesity.
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Affiliation(s)
- Amar M Singh
- Center for Molecular Medicine, Department of Biochemistry and Molecular Biology, University of Georgia, 325 Riverbend Road, Athens, GA 30602, USA
| | - Stephen Dalton
- Center for Molecular Medicine, Department of Biochemistry and Molecular Biology, University of Georgia, 325 Riverbend Road, Athens, GA 30602, USA.
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203
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Stadion M, Schwerbel K, Graja A, Baumeier C, Rödiger M, Jonas W, Wolfrum C, Staiger H, Fritsche A, Häring HU, Klöting N, Blüher M, Fischer-Posovszky P, Schulz TJ, Joost HG, Vogel H, Schürmann A. Increased Ifi202b/IFI16 expression stimulates adipogenesis in mice and humans. Diabetologia 2018; 61:1167-1179. [PMID: 29478099 PMCID: PMC6448999 DOI: 10.1007/s00125-018-4571-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 01/19/2018] [Indexed: 02/07/2023]
Abstract
AIMS/HYPOTHESIS Obesity results from a constant and complex interplay between environmental stimuli and predisposing genes. Recently, we identified the IFN-activated gene Ifi202b as the most likely gene responsible for the obesity quantitative trait locus Nob3 (New Zealand Obese [NZO] obesity 3). The aim of this study was to evaluate the effects of Ifi202b on body weight and adipose tissue biology, and to clarify the functional role of its human orthologue IFI16. METHODS The impact of Ifi202b and its human orthologue IFI16 on adipogenesis was investigated by modulating their respective expression in murine 3T3-L1 and human Simpson-Golabi-Behmel syndrome (SGBS) pre-adipocytes. Furthermore, transgenic mice overexpressing IFI202b were generated and characterised with respect to metabolic traits. In humans, expression levels of IFI16 in adipose tissue were correlated with several variables of adipocyte function. RESULTS In mice, IFI202b overexpression caused obesity (Δ body weight at the age of 30 weeks: 10.2 ± 1.9 g vs wild-type mice) marked by hypertrophic fat mass expansion, increased expression of Zfp423 (encoding the transcription factor zinc finger protein [ZFP] 423) and white-selective genes (Tcf21, Tle3), and decreased expression of thermogenic genes (e.g. Cidea, Ucp1). Compared with their wild-type littermates, Ifi202b transgenic mice displayed lower body temperature, hepatosteatosis and systemic insulin resistance. Suppression of IFI202b/IFI16 in pre-adipocytes impaired adipocyte differentiation and triacylglycerol storage. Humans with high levels of IFI16 exhibited larger adipocytes, an enhanced inflammatory state and impaired insulin-stimulated glucose uptake in white adipose tissue. CONCLUSIONS/INTERPRETATION Our findings reveal novel functions of Ifi202b and IFI16, demonstrating their role as obesity genes. These genes promote white adipogenesis and fat storage, thereby facilitating the development of obesity-associated insulin resistance.
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Affiliation(s)
- Mandy Stadion
- Department of Experimental Diabetology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, D-14558, Nuthetal, Germany
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
| | - Kristin Schwerbel
- Department of Experimental Diabetology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, D-14558, Nuthetal, Germany
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
| | - Antonia Graja
- Department of Adipocyte Development and Nutrition, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Christian Baumeier
- Department of Experimental Diabetology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, D-14558, Nuthetal, Germany
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
| | - Maria Rödiger
- Department of Experimental Diabetology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, D-14558, Nuthetal, Germany
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
| | - Wenke Jonas
- Department of Experimental Diabetology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, D-14558, Nuthetal, Germany
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
| | - Christian Wolfrum
- Institute of Food, Nutrition and Health, ETH Zürich, Schwerzenbach, Switzerland
| | - Harald Staiger
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
- Institute of Pharmaceutical Sciences, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Andreas Fritsche
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
- Division of Endocrinology, Diabetology, Angiology, Nephrology and Clinical Chemistry, Department of Internal Medicine, University Hospital Tübingen, Tübingen, Germany
| | - Hans-Ulrich Häring
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
- Division of Endocrinology, Diabetology, Angiology, Nephrology and Clinical Chemistry, Department of Internal Medicine, University Hospital Tübingen, Tübingen, Germany
| | - Nora Klöting
- IFB AdiposityDiseases, University of Leipzig, Leipzig, Germany
| | - Matthias Blüher
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - Pamela Fischer-Posovszky
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany
| | - Tim J Schulz
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
- Department of Adipocyte Development and Nutrition, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Hans-Georg Joost
- Department of Experimental Diabetology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, D-14558, Nuthetal, Germany
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
| | - Heike Vogel
- Department of Experimental Diabetology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, D-14558, Nuthetal, Germany
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
| | - Annette Schürmann
- Department of Experimental Diabetology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, D-14558, Nuthetal, Germany.
- German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany.
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Suchacki KJ, Cawthorn WP. Molecular Interaction of Bone Marrow Adipose Tissue with Energy Metabolism. CURRENT MOLECULAR BIOLOGY REPORTS 2018; 4:41-49. [PMID: 29888168 PMCID: PMC5976678 DOI: 10.1007/s40610-018-0096-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
PURPOSE OF REVIEW The last decade has seen a resurgence in the study of bone marrow adipose tissue (BMAT) across diverse fields such as metabolism, haematopoiesis, skeletal biology and cancer. Herein, we review the most recent developments of BMAT research in both humans and rodents, including the distinct nature of BMAT; the autocrine, paracrine and endocrine interactions between BMAT and various tissues, both in physiological and pathological scenarios; how these interactions might impact energy metabolism; and the most recent technological advances to quantify BMAT. RECENT FINDINGS Though still dwarfed by research into white and brown adipose tissues, BMAT is now recognised as endocrine organ and is attracting increasing attention from biomedical researchers around the globe. SUMMARY We are beginning to learn the importance of BMAT both within and beyond the bone, allowing us to better appreciate the role of BMAT in normal physiology and disease.
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Affiliation(s)
- Karla J. Suchacki
- University/British Heart Foundation Centre for Cardiovascular Science, The Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, EH16 4TJ UK
| | - William P. Cawthorn
- University/British Heart Foundation Centre for Cardiovascular Science, The Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, EH16 4TJ UK
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205
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Carrageta DF, Dias TR, Alves MG, Oliveira PF, Monteiro MP, Silva BM. Anti-obesity potential of natural methylxanthines. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.02.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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206
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Smith LA, O'Flanagan CH, Bowers LW, Allott EH, Hursting SD. Translating Mechanism-Based Strategies to Break the Obesity-Cancer Link: A Narrative Review. J Acad Nutr Diet 2018; 118:652-667. [PMID: 29102513 PMCID: PMC5869082 DOI: 10.1016/j.jand.2017.08.112] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 08/17/2017] [Indexed: 02/08/2023]
Abstract
Prevalence of obesity, an established risk factor for many cancers, has increased dramatically over the past 50 years in the United States and across the globe. Relative to normoweight cancer patients, obese cancer patients often have poorer prognoses, resistance to chemotherapies, and are more likely to develop distant metastases. Recent progress on elucidating the mechanisms underlying the obesity-cancer connection suggests that obesity exerts pleomorphic effects on pathways related to tumor development and progression and, thus, there are multiple opportunities for primary prevention and treatment of obesity-related cancers. Obesity-associated alterations, including systemic metabolism, adipose inflammation, growth factor signaling, and angiogenesis, are emerging as primary drivers of obesity-associated cancer development and progression. These obesity-associated host factors interact with the intrinsic molecular characteristics of cancer cells, facilitating several of the hallmarks of cancer. Each is considered in the context of potential preventive and therapeutic strategies to reduce the burden of obesity-related cancers. In addition, this review focuses on emerging mechanisms behind the obesity-cancer link, as well as relevant dietary interventions, including calorie restriction, intermittent fasting, low-fat diet, and ketogenic diet, that are being implemented in preclinical and clinical trials, with the ultimate goal of reducing incidence and progression of obesity-related cancers.
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207
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Jones TA, Reddy NL, Wayte SC, Adesanya O, Dimitriadis GK, Hutchinson CE, Barber TM. Brown fat depots in adult humans remain static in their locations on PET/CT despite changes in seasonality. Physiol Rep 2018; 5:5/11/e13284. [PMID: 28588036 PMCID: PMC5471433 DOI: 10.14814/phy2.13284] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 04/18/2017] [Indexed: 11/24/2022] Open
Abstract
Active brown adipose tissue (BAT) in humans has been demonstrated through use of positron emission tomography with 2-deoxy-2-(fluorine-18) fluoro-D-glucose integrated with computed tomography (18F-FDG PET/CT) scans. The aim of our study was to determine whether active human BAT depots shown on 18F-FDG PET/CT scans remain static in their location over time. This was a retrospective study. Adult human subjects (n = 15) who had had 18F-FDG PET/CT imaging (n = 38 scans in total) for clinical reasons were included on the basis of 18F-FDG uptake patterns consistent with BAT activity. For each subject, 18F-FDG BAT uptake pattern on serial 18F-FDG PET/CT images was compared to an index 18F-FDG PET/CT image with the largest demonstrable BAT volume. Object-based colocalization was expressed as Mander's correlation coefficient (where 1 = 100% overlap, 0 = no overlap). Distribution of 18F-FDG BAT activity over time and across multiple 18F-FDG BAT scans was equivalent in 60% (n = 9) of the subjects. The degree of consistency in the pattern of 18F-FDG BAT uptake in each subject over time was greater than expected by chance in 87% (n = 13) of the subjects (pair-wise agreement 75-100%, Fleiss' κ 0.4-1). The degree of BAT colocalization on serial scans was greater than that expected by chance in 93% (n = 14) of the subjects (mean Mander's coefficient 0.81 ± 0.21 [95% CI]). To our knowledge, our study provides the most conclusive evidence to date to support the notion that active BAT depots in humans (volumes and activities of which were measured through use of 18F-FDG PET/CT scans) remain static in location over sustained periods.
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Affiliation(s)
- Terence A Jones
- Clinical Sciences Research Laboratories, Warwick Medical School, University of Warwick, Coventry, CV2 2DX, United Kingdom .,Department of Radiology, University Hospitals Coventry and Warwickshire, Coventry, CV2 2DX, United Kingdom
| | - Narendra L Reddy
- Clinical Sciences Research Laboratories, Warwick Medical School, University of Warwick, Coventry, CV2 2DX, United Kingdom
| | - Sarah C Wayte
- Department of Medical Physics, University Hospitals Coventry and Warwickshire, Coventry, CV2 2DX, United Kingdom
| | - Oludolapo Adesanya
- Department of Radiology, University Hospitals Coventry and Warwickshire, Coventry, CV2 2DX, United Kingdom
| | - Georgios K Dimitriadis
- Clinical Sciences Research Laboratories, Warwick Medical School, University of Warwick, Coventry, CV2 2DX, United Kingdom
| | - Charles E Hutchinson
- Clinical Sciences Research Laboratories, Warwick Medical School, University of Warwick, Coventry, CV2 2DX, United Kingdom.,Department of Radiology, University Hospitals Coventry and Warwickshire, Coventry, CV2 2DX, United Kingdom
| | - Thomas M Barber
- Clinical Sciences Research Laboratories, Warwick Medical School, University of Warwick, Coventry, CV2 2DX, United Kingdom
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208
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Ahmadian M, Liu S, Reilly SM, Hah N, Fan W, Yoshihara E, Jha P, De Magalhaes Filho CD, Jacinto S, Gomez AV, Dai Y, Yu RT, Liddle C, Atkins AR, Auwerx J, Saltiel AR, Downes M, Evans RM. ERRγ Preserves Brown Fat Innate Thermogenic Activity. Cell Rep 2018; 22:2849-2859. [PMID: 29539415 PMCID: PMC5884669 DOI: 10.1016/j.celrep.2018.02.061] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 01/11/2018] [Accepted: 02/15/2018] [Indexed: 12/25/2022] Open
Abstract
Brown adipose tissue (BAT) adaptively transfers energy from glucose and fat into heat by inducing a gene network that uncouples mitochondrial electron transport. However, the innate transcription factors that enable the rapid adaptive response of BAT are unclear. Here, we identify estrogen-related receptor gamma (ERRγ) as a critical factor for maintaining BAT identity. ERRγ is selectively expressed in BAT versus WAT, in which, in the absence of PGC1α, it drives a signature transcriptional network of thermogenic and oxidative genes in the basal (i.e., thermoneutral) state. Mice lacking ERRγ in adipose tissue (ERRγKO mice) display marked downregulation of BAT-selective genes that leads to a pronounced whitening of BAT. Consistent with the transcriptional changes, the thermogenic capacity of ERRγKO mice is severely blunted, such that they fail to survive an acute cold challenge. These findings reveal a role for ERRγ as a critical thermoneutral maintenance factor required to prime BAT for thermogenesis.
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Affiliation(s)
- Maryam Ahmadian
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Sihao Liu
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Shannon M Reilly
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093-0757, USA
| | - Nasun Hah
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Weiwei Fan
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Eiji Yoshihara
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Pooja Jha
- Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | | | - Sandra Jacinto
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Andrew V Gomez
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093-0757, USA
| | - Yang Dai
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Ruth T Yu
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Christopher Liddle
- Storr Liver Centre, The Westmead Institute for Medical Research and Sydney Medical School, University of Sydney, Westmead, NSW 2145, Australia
| | - Annette R Atkins
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Johan Auwerx
- Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Alan R Saltiel
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093-0757, USA
| | - Michael Downes
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
| | - Ronald M Evans
- Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA; Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
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209
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Variability of T1-weighted signal intensity of pericallosal lipomas in the fetus. Pediatr Radiol 2018; 48:383-391. [PMID: 29184973 DOI: 10.1007/s00247-017-4028-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 10/02/2017] [Accepted: 11/03/2017] [Indexed: 01/19/2023]
Abstract
BACKGROUND Pericallosal lipomas are often associated with corpus callosum dysgenesis. The diagnosis of lipoma, suggested on ultrasonography, relies on the classic T1 hyperintensity on magnetic resonance imaging (MRI). However, this feature may be absent prenatally. OBJECTIVE Our objective was to study the changes of T1 intensity in fetal lipomas with comparison to postnatal/postmortem data and to assess the factors influencing the signal variations of pericallosal lipomas on prenatal MRI. MATERIALS AND METHODS Patients with callosum dysgenesis and interhemispheric hyperechogenicity suggestive of a pericallosal lipoma with available postnatal or postmortem data were included. Gestational age, lipoma size and pattern, corpus callosum size and changes in fetal fat T1 intensity were recorded. Comparison with postmortem neuropathology was available for one fetus. RESULTS Eleven patients with callosum dysgenesis and pericallosal lipomas (seven curvilinear and four tubulonodular) were included. All MRI scans were performed in the third trimester. Curvilinear lipomas were thinner and six cases were associated with prenatal T1 iso-intensity. Typical T1 hyperintensity appeared on postnatal MRI only. All tubulonodular lipomas were much larger and showed prenatal T1 hyperintensity. In two patients, the lipoma increased in size on postnatal MRI. CONCLUSION The type and size of a lipoma influence T1 prenatal intensity. Absence of T1 intensity was observed in curvilinear lipomas only. Curvilinear lipomas are much thinner. Changes in T1 intensity may also be related to fat maturation within the lipoma and, subsequently, to gestational age. In the case of callosum dysgenesis, absence of prenatal T1 pericallosal hyperintensity should not exclude the diagnosis of pericallosal lipoma.
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210
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Developmental patterns of fetal fat and corresponding signal on T1-weighted magnetic resonance imaging. Pediatr Radiol 2018; 48:317-324. [PMID: 29279948 DOI: 10.1007/s00247-017-4038-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 10/03/2017] [Accepted: 11/14/2017] [Indexed: 01/28/2023]
Abstract
BACKGROUND Evaluation of subcutaneous fetal fat layer thickness on T1-weighted sequences can be used to predict birth weight. Little is known about normal MR signal patterns of subcutaneous tissue throughout pregnancy. OBJECTIVE To establish developmental patterns of subcutaneous fetal fat signal on T1-weighted sequences during the 2nd and 3rd trimesters. MATERIALS AND METHODS We retrospectively examined T1-weighted images of 110 fetal MRI scans. We measured signal intensity of subcutaneous fat on thighs, buttocks, trunk, nuchal region, chin and scalp. We then calculated the ratios of the obtained values with fetal muscle, amnios and maternal fat signal, and compared the results with those of immunohistochemical examination of adipose tissue extracted from the abdominal wall of fetuses as part of standard autopsy protocol. RESULTS We included 60 MRI scans in fetuses without intra-uterine growth restriction or macrosomia of non-diabetic mothers (range 23-37 weeks of gestation). Fat T1 intensity of all anatomical regions was low in all fetuses before 26 weeks of gestation. It became more hyperintense with increasing gestational age, in the following order: chin and nuchal region, then buttocks, thighs and trunk, and eventually the scalp at 33 weeks of gestation. After 33 weeks of gestation, all fetal subcutaneous tissues demonstrated overall hyperintense signal. This progression followed the conversion at immunohistochemistry of fetal adipose tissue composition from predominant brown to white adipose cells in 19 fetuses (19-41 weeks of gestation). CONCLUSION Between 26 weeks and 33 weeks of gestation, subcutaneous fetal fat signal changed in an orderly pattern from chin to buttocks and scalp. This may reflect the conversion from predominant brown to white adipose tissues in subcutaneous fetal fat.
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Site-specific effects of apolipoprotein E expression on diet-induced obesity and white adipose tissue metabolic activation. Biochim Biophys Acta Mol Basis Dis 2018; 1864:471-480. [DOI: 10.1016/j.bbadis.2017.11.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 10/27/2017] [Accepted: 11/13/2017] [Indexed: 11/21/2022]
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Troyanova-Wood M, Gobbell C, Meng Z, Gashev AA, Yakovlev VV. Optical assessment of changes in mechanical and chemical properties of adipose tissue in diet-induced obese rats. JOURNAL OF BIOPHOTONICS 2017; 10:1694-1702. [PMID: 28464472 PMCID: PMC5668206 DOI: 10.1002/jbio.201600281] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/22/2017] [Accepted: 02/24/2017] [Indexed: 05/15/2023]
Abstract
Obesity is becoming a leading cause of health problems world-wide. Obesity and overweight are associated with the structural and chemical changes in tissues; however, few methods exist that allow for concurrent measurement of these changes. Using Brillouin and Raman microspectroscopy, both the mechanical and chemical differences can be assessed simultaneously. We hypothesized that Brillouin spectroscopy can measure the adipose tissues' stiffness, which increases in obesity. Samples of brown and white adipose tissues obtained from control and diet-induced obese adult rats were analyzed. The results show that both adipose tissues of the obese group exhibit a greater high-frequency longitudinal elastic modulus than the control samples, and that the brown fat is generally stiffer than white adipose. The Raman spectra indicate that the lipids' accumulation in adipose tissue outpaces the fibrosis, and that the high-fat diet has a greater effect on the brown adipose than the white fat. Overall, the powerful combination of Brillouin and Raman microspectroscopies successfully assessed both the mechanical properties and chemical composition of adipose tissue simultaneously for the first time. The results indicate that the adipose tissue experiences an obesity-induced increase in stiffness and lipid content, with the brown adipose tissue undergoing a more pronounced change compared to white adipose.
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Affiliation(s)
- Maria Troyanova-Wood
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843-3120, USA
| | - Cassidy Gobbell
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843-3120, USA
| | - Zhaokai Meng
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843-3120, USA
| | - Anatoliy A. Gashev
- Department of Medical Physiology, College of Medicine, Texas A&M University Health Science Center, Temple, TX, 76504, USA
| | - Vladislav V. Yakovlev
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843-3120, USA
- Corresponding Author:
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E. Kypreos K, A. Karavia E, Constantinou C, Hatziri A, Kalogeropoulou C, Xepapadaki E, Zvintzou E. Apolipoprotein E in diet-induced obesity: a paradigm shift from conventional perception. J Biomed Res 2017; 32:183. [PMID: 29770778 PMCID: PMC6265402 DOI: 10.7555/jbr.32.20180007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 03/08/2018] [Indexed: 12/16/2022] Open
Abstract
Apolipoprotein E (APOE) is a major protein component of peripheral and brain lipoprotein transport systems. APOE in peripheral circulation does not cross blood brain barrier or blood cerebrospinal fluid barrier. As a result, peripheral APOE expression does not affect brain APOE levels and vice versa. Numerous epidemiological studies suggest a key role of peripherally expressed APOE in the development and progression of coronary heart disease while brain APOE has been associated with dementia and Alzheimer's disease. More recent studies, mainly in experimental mice, suggested a link between Apoe and morbid obesity. According to the latest findings, expression of human apolipoprotein E3 (APOE3) isoform in the brain of mice is associated with a potent inhibition of visceral white adipose tissue (WAT) mitochondrial oxidative phosphorylation leading to significantly reduced substrate oxidation, increased fat accumulation and obesity. In contrast, hepatically expressed APOE3 is associated with a notable shift of substrate oxidation towards non-shivering thermogenesis in visceral WAT mitochondria, leading to resistance to obesity. These novel findings constitute a major paradigm shift from the widely accepted perception that APOE promotes obesity via receptor-mediated postprandial lipid delivery to WAT. Here, we provide a critical review of the latest facts on the role of APOE in morbid obesity.
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Affiliation(s)
- Kyriakos E. Kypreos
- Department of Pharmacology, University of Patras Medical School, Rio Achaias, TK 26500, Greece
| | - Eleni A. Karavia
- Department of Pharmacology, University of Patras Medical School, Rio Achaias, TK 26500, Greece
| | - Caterina Constantinou
- Department of Pharmacology, University of Patras Medical School, Rio Achaias, TK 26500, Greece
| | - Aikaterini Hatziri
- Department of Pharmacology, University of Patras Medical School, Rio Achaias, TK 26500, Greece
| | | | - Eva Xepapadaki
- Department of Pharmacology, University of Patras Medical School, Rio Achaias, TK 26500, Greece
| | - Evangelia Zvintzou
- Department of Pharmacology, University of Patras Medical School, Rio Achaias, TK 26500, Greece
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214
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Frank AP, Palmer BF, Clegg DJ. Do estrogens enhance activation of brown and beiging of adipose tissues? Physiol Behav 2017; 187:24-31. [PMID: 28988965 DOI: 10.1016/j.physbeh.2017.09.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 09/30/2017] [Accepted: 09/30/2017] [Indexed: 01/05/2023]
Abstract
Obesity and its associated co-morbidities are worldwide public health concerns. Obesity is characterized by excessive adipose tissue accumulation; however, it is important to recognize that human and rodent adipose tissues are made up of several distinct adipose tissue sub-types. White adipose tissue (WAT) is considered the prototypical fat cell, due to its capacity and capability to store large amounts of lipid. In contrast, brown adipose tissue (BAT) oxidizes substrates to generate heat. BAT contains more mitochondria than WAT and express uncoupling protein-1 (UCP1), which mediates BAT thermogenesis. A third sub-type of adipose tissue, Brown-in-white (BRITE)/beige adipocytes arise from WAT upon adrenergic stimulation and resembles BAT functionally. The energy burning feature of BAT/beige cells, combined with evidence of an inverse-correlation between BAT/beige adipose tissue and obesity have given rise to the hypothesis that obesity may be linked to BAT/beige 'malfunction'. Females have more BAT and perhaps an enhanced capacity to beige their adipose tissue when compared to males. Multiple signal pathways are capable of activating BAT thermogenesis and beiging of WAT; here, we discuss the potential role of estrogens in enhancing and mediating these factors to enhance adipose tissue thermogenesis.
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Affiliation(s)
- Aaron P Frank
- Biomedical Research Division, Diabetes and Obesity Research Institute, Department of Biomedical Science, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | - Biff F Palmer
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Deborah J Clegg
- Biomedical Research Division, Diabetes and Obesity Research Institute, Department of Biomedical Science, Cedars-Sinai Medical Center, Los Angeles, CA, United States.
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215
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Akoumianakis I, Akawi N, Antoniades C. Exploring the Crosstalk between Adipose Tissue and the Cardiovascular System. Korean Circ J 2017; 47:670-685. [PMID: 28955384 PMCID: PMC5614942 DOI: 10.4070/kcj.2017.0041] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 04/04/2017] [Indexed: 12/28/2022] Open
Abstract
Obesity is a clinical entity critically involved in the development and progression of cardiovascular disease (CVD), which is characterised by variable expansion of adipose tissue (AT) mass across the body as well as by phenotypic alterations in AT. AT is able to secrete a diverse spectrum of biologically active substances called adipocytokines, which reach the cardiovascular system via both endocrine and paracrine routes, potentially regulating a variety of physiological and pathophysiological responses in the vasculature and heart. Such responses include regulation of inflammation and oxidative stress as well as cell proliferation, migration and hypertrophy. Furthermore, clinical observations such as the “obesity paradox,” namely the fact that moderately obese patients with CVD have favourable clinical outcome, strongly indicate that the biological “quality” of AT may be far more crucial than its overall mass in the regulation of CVD pathogenesis. In this work, we describe the anatomical and biological diversity of AT in health and metabolic disease; we next explore its association with CVD and, importantly, novel evidence for its dynamic crosstalk with the cardiovascular system, which could regulate CVD pathogenesis.
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Affiliation(s)
- Ioannis Akoumianakis
- Division of Cardiovascular Medicine, University of Oxford, Oxford, United Kingdom
| | - Nadia Akawi
- Division of Cardiovascular Medicine, University of Oxford, Oxford, United Kingdom
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216
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do Amaral RJFC, Almeida HV, Kelly DJ, O'Brien FJ, Kearney CJ. Infrapatellar Fat Pad Stem Cells: From Developmental Biology to Cell Therapy. Stem Cells Int 2017; 2017:6843727. [PMID: 29018484 PMCID: PMC5606137 DOI: 10.1155/2017/6843727] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 08/03/2017] [Indexed: 12/20/2022] Open
Abstract
The ideal cell type to be used for cartilage therapy should possess a proven chondrogenic capacity, not cause donor-site morbidity, and should be readily expandable in culture without losing their phenotype. There are several cell sources being investigated to promote cartilage regeneration: mature articular chondrocytes, chondrocyte progenitors, and various stem cells. Most recently, stem cells isolated from joint tissue, such as chondrogenic stem/progenitors from cartilage itself, synovial fluid, synovial membrane, and infrapatellar fat pad (IFP) have gained great attention due to their increased chondrogenic capacity over the bone marrow and subcutaneous adipose-derived stem cells. In this review, we first describe the IFP anatomy and compare and contrast it with other adipose tissues, with a particular focus on the embryological and developmental aspects of the tissue. We then discuss the recent advances in IFP stem cells for regenerative medicine. We compare their properties with other stem cell types and discuss an ontogeny relationship with other joint cells and their role on in vivo cartilage repair. We conclude with a perspective for future clinical trials using IFP stem cells.
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Affiliation(s)
- Ronaldo J. F. C. do Amaral
- Tissue Engineering Research Group, Department of Anatomy, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Henrique V. Almeida
- CNC, Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Daniel J. Kelly
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
- Department of Mechanical and Manufacturing Engineering School of Engineering, Trinity College Dublin, Dublin, Ireland
- Advanced Materials and Bioengineering Research Centre (AMBER), Trinity College Dublin & Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Fergal J. O'Brien
- Tissue Engineering Research Group, Department of Anatomy, Royal College of Surgeons in Ireland, Dublin, Ireland
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
- Advanced Materials and Bioengineering Research Centre (AMBER), Trinity College Dublin & Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Cathal J. Kearney
- Tissue Engineering Research Group, Department of Anatomy, Royal College of Surgeons in Ireland, Dublin, Ireland
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
- Advanced Materials and Bioengineering Research Centre (AMBER), Trinity College Dublin & Royal College of Surgeons in Ireland, Dublin, Ireland
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217
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Zubidat AE, Haim A. Artificial light-at-night - a novel lifestyle risk factor for metabolic disorder and cancer morbidity. J Basic Clin Physiol Pharmacol 2017; 28:295-313. [PMID: 28682785 DOI: 10.1515/jbcpp-2016-0116] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 03/02/2017] [Indexed: 06/07/2023]
Abstract
Both obesity and breast cancer are already recognized worldwide as the most common syndromes in our modern society. Currently, there is accumulating evidence from epidemiological and experimental studies suggesting that these syndromes are closely associated with circadian disruption. It has been suggested that melatonin (MLT) and the circadian clock genes both play an important role in the development of these syndromes. However, we still poorly understand the molecular mechanism underlying the association between circadian disruption and the modern health syndromes. One promising candidate is epigenetic modifications of various genes, including clock genes, circadian-related genes, oncogenes, and metabolic genes. DNA methylation is the most prominent epigenetic signaling tool for gene expression regulation induced by environmental exposures, such as artificial light-at-night (ALAN). In this review, we first provide an overview on the molecular feedback loops that generate the circadian regulation and how circadian disruption by ALAN can impose adverse impacts on public health, particularly metabolic disorders and breast cancer development. We then focus on the relation between ALAN-induced circadian disruption and both global DNA methylation and specific loci methylation in relation to obesity and breast cancer morbidities. DNA hypo-methylation and DNA hyper-methylation, are suggested as the most studied epigenetic tools for the activation and silencing of genes that regulate metabolic and monostatic responses. Finally, we discuss the potential clinical and therapeutic roles of MLT suppression and DNA methylation patterns as novel biomarkers for the early detection of metabolic disorders and breast cancer development.
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218
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Chu DT, Tao Y, Son LH, Le DH. Cell source, differentiation, functional stimulation, and potential application of human thermogenic adipocytes in vitro. J Physiol Biochem 2017; 73:315-321. [PMID: 28612196 DOI: 10.1007/s13105-017-0567-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 05/29/2017] [Indexed: 12/14/2022]
Abstract
Recent investigations have showed that the functional thermogenic adipocytes are present in both infants and adult humans. Accumulating evidence suggests that the coexistence of classical and inducible brown (brite) adipocytes in humans at adulthood and these adipocytes function to generate heat from energy resulting in reducing body fat and improving glucose metabolism. Human thermogenic adipocytes can be differentiated in vitro from stem cells, cell lines, or adipose stromal vascular fraction. Pre-activated human brite adipocytes in vitro can maintain their thermogenic function in normal or obese immunodeficient mice; therefore, they improve glucose homeostasis and reduce fat mass in obese animals. These key findings have opened a new door to use in vitro thermogenic adipocytes as a cell therapy to prevent obesity and related disorders. Thus, this paper intends to highlight our knowledge in aspects of in vitro human brite/brown adipocytes for the further studies.
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Affiliation(s)
- Dinh-Toi Chu
- Institute for Research and Development, Duy Tan University, 03 Quang Trung, Da Nang, Vietnam. .,Faculty of Biology, Hanoi National University of Education, Hanoi, Vietnam.
| | - Yang Tao
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Vietnam
| | - Le Hoang Son
- VNU University of Science, Vietnam National University, Hanoi, Vietnam
| | - Duc-Hau Le
- VINMEC Research Institute of Stem Cell and Gene Technology, Hanoi, Vietnam
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219
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Hypoxia in Obesity and Diabetes: Potential Therapeutic Effects of Hyperoxia and Nitrate. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:5350267. [PMID: 28607631 PMCID: PMC5457776 DOI: 10.1155/2017/5350267] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Revised: 04/04/2017] [Accepted: 04/11/2017] [Indexed: 02/06/2023]
Abstract
The prevalence of obesity and diabetes is increasing worldwide. Obesity and diabetes are associated with oxidative stress, inflammation, endothelial dysfunction, insulin resistance, and glucose intolerance. Obesity, a chronic hypoxic state that is associated with decreased nitric oxide (NO) bioavailability, is one of the main causes of type 2 diabetes. The hypoxia-inducible factor-1α (HIF-1α) is involved in the regulation of several genes of the metabolic pathways including proinflammatory adipokines, endothelial NO synthase (eNOS), and insulin signaling components. It seems that adipose tissue hypoxia and NO-dependent vascular and cellular dysfunctions are responsible for other consequences linked to obesity-related disorders. Although hyperoxia could reverse hypoxic-related disorders, it increases the production of reactive oxygen species (ROS) and decreases the production of NO. Nitrate can restore NO depletion and has antioxidant properties, and recent data support the beneficial effects of nitrate therapy in obesity and diabetes. Although it seems reasonable to combine hyperoxia and nitrate treatments for managing obesity/diabetes, the combined effects have not been investigated yet. This review discusses some aspects of tissue oxygenation and the potential effects of hyperoxia and nitrate interventions on obesity/diabetes management. It can be proposed that concomitant use of hyperoxia and nitrate is justified for managing obesity and diabetes.
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220
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Krishna R, Gheyas F, Liu Y, Hagen DR, Walker B, Chawla A, Cote J, Blaustein RO, Gutstein DE. Chronic Administration of Anacetrapib Is Associated With Accumulation in Adipose and Slow Elimination. Clin Pharmacol Ther 2017; 102:832-840. [DOI: 10.1002/cpt.700] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 03/14/2017] [Accepted: 03/28/2017] [Indexed: 11/07/2022]
Affiliation(s)
- R Krishna
- MRL, Merck & Co., Inc.; Kenilworth New Jersey
| | - F Gheyas
- MRL, Merck & Co., Inc.; Kenilworth New Jersey
| | - Y Liu
- MRL, Merck & Co., Inc.; Kenilworth New Jersey
| | - DR Hagen
- MRL, Merck & Co., Inc.; Kenilworth New Jersey
| | - B Walker
- MRL, Merck & Co., Inc.; Kenilworth New Jersey
| | - A Chawla
- MRL, Merck & Co., Inc.; Kenilworth New Jersey
| | - J Cote
- MRL, Merck & Co., Inc.; Kenilworth New Jersey
| | | | - DE Gutstein
- MRL, Merck & Co., Inc.; Kenilworth New Jersey
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221
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Cowan M, Azpeleta C, López-Olmeda JF. Rhythms in the endocrine system of fish: a review. J Comp Physiol B 2017; 187:1057-1089. [DOI: 10.1007/s00360-017-1094-5] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2016] [Revised: 03/20/2017] [Accepted: 04/06/2017] [Indexed: 12/20/2022]
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222
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You L, Zhou Y, Cui X, Wang X, Sun Y, Gao Y, Wang X, Wen J, Xie K, Tang R, Ji C, Guo X. GM13133 is a negative regulator in mouse white adipocytes differentiation and drives the characteristics of brown adipocytes. J Cell Physiol 2017; 233:313-324. [PMID: 28247947 DOI: 10.1002/jcp.25878] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 02/27/2017] [Indexed: 12/26/2022]
Abstract
Obesity is tightly associated with the disturbance of white adipose tissue storing excess energy. Thermogenic adipocytes (brown and beige) exert a critical role of oxidizing nutrients at the high rates through non-shivering thermogenesis. The recruitment of brown characteristics in white adipocytes, termed browning, has been considered as a promising strategy for treating obesity and associated metabolic complications. Recently, long noncoding RNAs play a crucial role in regulating tissue development and participating in disease pathogenesis, yet their effects on the conversion of white into brown-like adipocytes and thermogenic function were not totally understood. Here, we identified a mouse brown adipose specific expressed lncRNA, termed GM13133. Moreover, a considerable amount of GM13133 is expressed in adipocytes and actively modulated by cold, β3 -adrenergic agonist and cAMP stimuli, implying a potential role in the conversion from white to brown adipocytes. Overexpression of GM13133 did not affect the proliferation of mouse white pre-adipocytes, but inhibited white adipocyte differentiation by decreasing lipid accumulation. The forced expression of GM13133 also significantly drove the conversion of white into brown-like adipocytes with the enhanced mitochondrial biogenesis and the induced expression of brown adipocytes specific markers. A global mRNA analysis further indicated the possible regulatory role of cAMP signaling pathway in GM13133 mediated white-to-brown adipocytes conversion. Our results identified a lncRNA-mediated modulation in primary mouse white adipocyte differentiation and indicate the functional significance of GM13133 in promoting browning of white adipocytes and maintenance of thermogenesis, further providing a potential strategy to treating obesity.
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Affiliation(s)
- LiangHui You
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - YaHui Zhou
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China.,Institute of Pediatrics, Nanjing Medical University, Nanjing, 210029, China
| | - XianWei Cui
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - XingYun Wang
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - YaZhou Sun
- Department of Pediatrics, The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, 453003, China
| | - Yao Gao
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - Xing Wang
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - Juan Wen
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - Kaipeng Xie
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - RanRan Tang
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China
| | - ChenBo Ji
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China.,Institute of Pediatrics, Nanjing Medical University, Nanjing, 210029, China
| | - XiRong Guo
- Nanjing Maternity and Child Health Care Institute, Nanjing Maternity and Child Health Care Hospital, Obsterics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, 210004, China.,Institute of Pediatrics, Nanjing Medical University, Nanjing, 210029, China
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223
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Affiliation(s)
- Sandor G Vari
- Sandor G. Vari, International Research and Innovation in Medicine Program, Cedars-Sinai Medical Center, Los Angeles, CA, USA and Association for Regional Cooperation in the Fields of Health, Science and Technology (RECOOP HST Association), Debrecen, Hungary,
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224
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Intrinsic Properties of Brown and White Adipocytes Have Differential Effects on Macrophage Inflammatory Responses. Mediators Inflamm 2017; 2017:9067049. [PMID: 28458470 PMCID: PMC5385256 DOI: 10.1155/2017/9067049] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 01/31/2017] [Accepted: 02/12/2017] [Indexed: 12/13/2022] Open
Abstract
Obesity is marked by chronic, low-grade inflammation. Here, we examined whether intrinsic differences between white and brown adipocytes influence the inflammatory status of macrophages. White and brown adipocytes were characterized by transcriptional regulation of UCP-1, PGC1α, PGC1β, and CIDEA and their level of IL-6 secretion. The inflammatory profile of PMA-differentiated U937 and THP-1 macrophages, in resting state and after stimulation with LPS/IFN-gamma and IL-4, was assessed by measuring IL-6 secretion and transcriptional regulation of a panel of inflammatory genes after mono- or indirect coculture with white and brown adipocytes. White adipocyte monocultures show increased IL-6 secretion compared to brown adipocytes. White adipocytes cocultured with U937 and THP-1 macrophages induced a greater increase in IL-6 secretion compared to brown adipocytes cocultured with both macrophages. White adipocytes cocultured with macrophages increased inflammatory gene expression in both types. In contrast, macrophages cocultured with brown adipocytes induced downregulation or no alterations in inflammatory gene expression. The effects of adipocytes on macrophages appear to be independent of stimulation state. Brown adipocytes exhibit an intrinsic ability to dampen inflammatory profile of macrophages, while white adipocytes enhance it. These data suggest that brown adipocytes may be less prone to adipose tissue inflammation that is associated with obesity.
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225
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Blaner WS, Gao MA, Jiang H, Dalmer TRA, Hu XJ, Ginsberg HN, Clugston RD. Chronic alcohol consumption decreases brown adipose tissue mass and disrupts thermoregulation: a possible role for altered retinoid signaling. Sci Rep 2017; 7:43474. [PMID: 28262768 PMCID: PMC5337954 DOI: 10.1038/srep43474] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 01/25/2017] [Indexed: 12/14/2022] Open
Abstract
Retinoic acid, an active metabolite of dietary vitamin A, acts as a ligand for nuclear receptor transcription factors with more than 500 known target genes. It is becoming increasingly clear that alcohol has a significant impact on cellular retinoic acid metabolism, with resultant effects on its function. Here, we test the hypothesis that chronic alcohol consumption impairs retinoic acid signaling in brown adipose tissue (BAT), leading to impaired BAT function and thermoregulation. All studies were conducted in age-matched, male mice consuming alcohol-containing liquid diets. Alcohol’s effect on BAT was assessed by histology, qPCR, HPLC, LC/MS and measures of core body temperature. Our data show that chronic alcohol consumption decreases BAT mass, with a resultant effect on thermoregulation. Follow-up mechanistic studies reveal a decreased triglyceride content in BAT, as well as impaired retinoic acid homeostasis, associated with decreased BAT levels of retinoic acid in alcohol-consuming mice. Our work highlights a hitherto uncharacterized effect of alcohol on BAT function, with possible implications for thermoregulation and energy metabolism in drinkers. Our data indicate that alcohol’s effects on brown adipose tissue may be mediated through altered retinoic acid signaling.
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Affiliation(s)
| | - Madeleine A Gao
- Department of Medicine, Columbia University, New York, NY, USA
| | - Hongfeng Jiang
- Department of Medicine, Columbia University, New York, NY, USA
| | - Timothy R A Dalmer
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
| | - Xueyuan J Hu
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
| | | | - Robin D Clugston
- Department of Medicine, Columbia University, New York, NY, USA.,Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
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226
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Caliskan OS, Sardan Ekiz M, Tekinay AB, Guler MO. Spatial Organization of Functional Groups on Bioactive Supramolecular Glycopeptide Nanofibers for Differentiation of Mesenchymal Stem Cells (MSCs) to Brown Adipogenesis. Bioconjug Chem 2016; 28:740-750. [DOI: 10.1021/acs.bioconjchem.6b00632] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ozum S. Caliskan
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
| | - Melis Sardan Ekiz
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
| | - Ayse B. Tekinay
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
| | - Mustafa O. Guler
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
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227
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Akoumianakis I, Tarun A, Antoniades C. Perivascular adipose tissue as a regulator of vascular disease pathogenesis: identifying novel therapeutic targets. Br J Pharmacol 2016; 174:3411-3424. [PMID: 27976387 DOI: 10.1111/bph.13666] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Revised: 10/04/2016] [Accepted: 10/28/2016] [Indexed: 12/23/2022] Open
Abstract
Adipose tissue (AT) is an active endocrine organ with the ability to dynamically secrete a wide range of adipocytokines. Importantly, its secretory profile is altered in various cardiovascular disease states. AT surrounding vessels, or perivascular AT (PVAT), is recognized in particular as an important local regulator of vascular function and dysfunction. Specifically, PVAT has the ability to sense vascular paracrine signals and respond by secreting a variety of vasoactive adipocytokines. Due to the crucial role of PVAT in regulating many aspects of vascular biology, it may constitute a novel therapeutic target for the prevention and treatment of vascular disease pathogenesis. Signalling pathways in PVAT, such as those using adiponectin, H2 S, glucagon-like peptide 1 or pro-inflammatory cytokines, are among the potential novel pharmacological therapeutic targets of PVAT. LINKED ARTICLES This article is part of a themed section on Molecular Mechanisms Regulating Perivascular Adipose Tissue - Potential Pharmacological Targets? To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.20/issuetoc.
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Affiliation(s)
- Ioannis Akoumianakis
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford
| | - Akansha Tarun
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford
| | - Charalambos Antoniades
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford
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228
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Palikaras K, Mari M, Petanidou B, Pasparaki A, Filippidis G, Tavernarakis N. Ectopic fat deposition contributes to age-associated pathology in Caenorhabditis elegans. J Lipid Res 2016; 58:72-80. [PMID: 27884963 DOI: 10.1194/jlr.m069385] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Revised: 11/06/2016] [Indexed: 01/08/2023] Open
Abstract
Age-dependent collapse of lipid homeostasis results in spillover of lipids and excessive fat deposition in nonadipose tissues. Ectopic fat contributes to lipotoxicity and has been implicated in the development of a metabolic syndrome that increases risk of age-associated diseases. However, the molecular mechanisms coupling ectopic fat accumulation with aging remain obscure. Here, we use nonlinear imaging modalities to visualize and quantify age-dependent ectopic lipid accumulation in Caenorhabditis elegans We find that aging is accompanied by pronounced deposition of lipids in nonadipose tissues, including the nervous system. Importantly, interventions that promote longevity such as low insulin signaling, germ-line loss, and dietary restriction, which effectively delay aging in evolutionary divergent organisms, diminish the rate of ectopic fat accumulation and the size of lipid droplets. Suppression of lipotoxic accumulation of fat in heterologous tissues is dependent on helix-loop-helix (HLH)-30/transcription factor EB (TFEB) and autophagy. Our findings in their totality highlight the pivotal role of HLH-30/TFEB and autophagic processes in the maintenance of lipid homeostasis during aging, in addition to establishing nonlinear imaging as a powerful tool for monitoring ectopic lipid droplet deposition in vivo.
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Affiliation(s)
- Konstantinos Palikaras
- Institute of Molecular Biology and Biotechnology Foundation for Research and Technology, Heraklion 71110, Crete, Greece
| | - Meropi Mari
- Institute of Molecular Biology and Biotechnology Foundation for Research and Technology, Heraklion 71110, Crete, Greece
| | - Barbara Petanidou
- Institute of Electronic Structure and Laser, Foundation for Research and Technology, Heraklion 71110, Crete, Greece.,Physics Department University of Crete, Heraklion 71003, Crete, Greece
| | - Angela Pasparaki
- Institute of Molecular Biology and Biotechnology Foundation for Research and Technology, Heraklion 71110, Crete, Greece
| | - George Filippidis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology, Heraklion 71110, Crete, Greece
| | - Nektarios Tavernarakis
- Institute of Molecular Biology and Biotechnology Foundation for Research and Technology, Heraklion 71110, Crete, Greece .,Medical School, University of Crete, Heraklion 71003, Crete, Greece
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229
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Farias-Itao DS, Pasqualucci CA, Nishizawa A, Silva LFF, Campos FM, Silva KCSD, Leite REP, Grinberg LT, Ferretti-Rebustini REL, Jacob Filho W, Suemoto CK. Perivascular Adipose Tissue Inflammation and Coronary Artery Disease: An Autopsy Study Protocol. JMIR Res Protoc 2016; 5:e211. [PMID: 27864166 PMCID: PMC5135732 DOI: 10.2196/resprot.6340] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 09/11/2016] [Accepted: 09/14/2016] [Indexed: 01/02/2023] Open
Abstract
Background Perivascular adipose tissue (PAT) inflammation may have a role in coronary artery disease (CAD) pathophysiology. However, most evidence has come from samples obtained during surgical procedures that may imply in some limitations. Moreover, the role of B lymphocytes and inflammation in PAT that is adjacent to unstable atheroma plaques has not been investigated in humans using morphometric measurements. Objective The objective of this study is to investigate the inflammation in PAT, subcutaneous, and perirenal adipose tissues (SAT and PrAT) among chronic CAD, acute CAD, and control groups in an autopsy study. Methods Heart, SAT, and PrAT samples are collected from autopsied subjects in a general autopsy service, with the written informed consent of the next-of-kin (NOK). Sociodemographic and clinical data are obtained from a semistructure interview with the NOK. Coronary arteries are dissected and PAT are removed. Sections with the greatest arterial obstruction or unstable plaques, and the local with absence of atherosclerosis in all coronary arteries are sampled. PAT are represented adjacent to these fragments. Adipose tissues are fixed in 4% buffered paraformaldehyde solution and analyzed immunohistochemically for macrophages (CD68), macrophage polarization (CD11c for proinflammatory and CD206 for anti-inflammatory), B lymphocytes (CD20), and T lymphocytes (CD3). Slides will be scanned, and inflammatory cells will be quantified in 20 random fields. Participants will be categorized in CAD groups, after morphometric measurement of arterial obstruction and plaque composition analysis in accordance with American Heart Association classification. Three study groups will be investigated: acute CAD (at least one unstable plaque); chronic CAD (≥50% arterial obstruction); and controls (<50% arterial obstruction). Inflammatory cells in PAT, SAT, and PrAT will be counted and compared between groups using multivariate linear regression, adjusted for age, body mass index, hypertension, diabetes, alcohol use, and smoking. Results We present the methods of our study that was developed from 2 pilots. Currently, data collection and tissue processing are ongoing. Data collection, histology and immunochemistry procedures, and quantification of all inflammatory cells are expected to be concluded within 1 year. Conclusions This study will contribute for the understanding of the mechanisms of CAD pathophysiology because it will help to clarify the role of inflammation both in chronic and acute CAD.
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Affiliation(s)
- Daniela Souza Farias-Itao
- Laboratory of Cardiovascular Pathology, Department of Pathology - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | - Carlos Augusto Pasqualucci
- Laboratory of Cardiovascular Pathology, Department of Pathology - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | - Aline Nishizawa
- Laboratory of Cardiovascular Pathology, Department of Pathology - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | | | - Fernanda Marinho Campos
- Laboratory of Cardiovascular Pathology, Department of Pathology - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | - Karen Cristina Souza da Silva
- Laboratory of Cardiovascular Pathology, Department of Pathology - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | - Renata Elaine Paraizo Leite
- Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Discipline of Geriatrics, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | - Lea Tenenholz Grinberg
- Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA, United States
| | - Renata Eloah Lucena Ferretti-Rebustini
- Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Medical-Surgical Nursing Department, University of Sao Paulo School of Nursing, Sao Paulo, Brazil
| | - Wilson Jacob Filho
- Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Discipline of Geriatrics, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | - Claudia Kimie Suemoto
- Laboratory of Cardiovascular Pathology, Department of Pathology - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Physiopathology in Aging Lab/Brazilian Aging Brain Study Group - LIM22, University of Sao Paulo Medical School, Sao Paulo, Brazil.,Discipline of Geriatrics, University of Sao Paulo Medical School, Sao Paulo, Brazil
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230
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Shipp SL, Cline MA, Gilbert ER. Recent advances in the understanding of how neuropeptide Y and α-melanocyte stimulating hormone function in adipose physiology. Adipocyte 2016; 5:333-350. [PMID: 27994947 DOI: 10.1080/21623945.2016.1208867] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 06/28/2016] [Accepted: 06/28/2016] [Indexed: 12/20/2022] Open
Abstract
Communication between the brain and the adipose tissue has been the focus of many studies in recent years, with the "brain-fat axis" identified as a system that orchestrates the assimilation and usage of energy to maintain body mass and adequate fat stores. It is now well-known that appetite-regulating peptides that were studied as neurotransmitters in the central nervous system can act both on the hypothalamus to regulate feeding behavior and also on the adipose tissue to modulate the storage of energy. Energy balance is thus partly controlled by factors that can alter both energy intake and storage/expenditure. Two such factors involved in these processes are neuropeptide Y (NPY) and α-melanocyte stimulating hormone (α-MSH). NPY, an orexigenic factor, is associated with promoting adipogenesis in both mammals and chickens, while α-MSH, an anorexigenic factor, stimulates lipolysis in rodents. There is also evidence of interaction between the 2 peptides. This review aims to summarize recent advances in the study of NPY and α-MSH regarding their role in adipose tissue physiology, with an emphasis on the cellular and molecular mechanisms. A greater understanding of the brain-fat axis and regulation of adiposity by bioactive peptides may provide insights on strategies to prevent or treat obesity and also enhance nutrient utilization efficiency in agriculturally-important species.
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231
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Rapamycin negatively impacts insulin signaling, glucose uptake and uncoupling protein-1 in brown adipocytes. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:1929-1941. [PMID: 27686967 DOI: 10.1016/j.bbalip.2016.09.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 09/20/2016] [Accepted: 09/22/2016] [Indexed: 11/21/2022]
Abstract
New onset diabetes after transplantation (NODAT) is a metabolic disorder that affects 40% of patients on immunosuppressive agent (IA) treatment, such as rapamycin (also known as sirolimus). IAs negatively modulate insulin action in peripheral tissues including skeletal muscle, liver and white fat. However, the effects of IAs on insulin sensitivity and thermogenesis in brown adipose tissue (BAT) have not been investigated. We have analyzed the impact of rapamycin on insulin signaling, thermogenic gene-expression and mitochondrial respiration in BAT. Treatment of brown adipocytes with rapamycin for 16h significantly decreased insulin receptor substrate 1 (IRS1) protein expression and insulin-mediated protein kinase B (Akt) phosphorylation. Consequently, both insulin-induced glucose transporter 4 (GLUT4) translocation to the plasma membrane and glucose uptake were decreased. Early activation of the N-terminal Janus activated kinase (JNK) was also observed, thereby increasing IRS1 Ser 307 phosphorylation. These effects of rapamycin on insulin signaling in brown adipocytes were partly prevented by a JNK inhibitor. In vivo treatment of rats with rapamycin for three weeks abolished insulin-mediated Akt phosphorylation in BAT. Rapamycin also inhibited norepinephrine (NE)-induced lipolysis, the expression of peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) and uncoupling protein (UCP)-1 in brown adipocytes. Importantly, basal mitochondrial respiration, proton leak and maximal respiratory capacity were significantly decreased in brown adipocytes treated with rapamycin. In conclusion, we demonstrate, for the first time the important role of brown adipocytes as target cells of rapamycin, suggesting that insulin resistance in BAT might play a major role in NODAT development.
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232
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Manna P, Jain SK. Obesity, Oxidative Stress, Adipose Tissue Dysfunction, and the Associated Health Risks: Causes and Therapeutic Strategies. Metab Syndr Relat Disord 2016; 13:423-44. [PMID: 26569333 DOI: 10.1089/met.2015.0095] [Citation(s) in RCA: 574] [Impact Index Per Article: 71.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Obesity is gaining acceptance as a serious primary health burden that impairs the quality of life because of its associated complications, including diabetes, cardiovascular diseases, cancer, asthma, sleep disorders, hepatic dysfunction, renal dysfunction, and infertility. It is a complex metabolic disorder with a multifactorial origin. Growing evidence suggests that oxidative stress plays a role as the critical factor linking obesity with its associated complications. Obesity per se can induce systemic oxidative stress through various biochemical mechanisms, such as superoxide generation from NADPH oxidases, oxidative phosphorylation, glyceraldehyde auto-oxidation, protein kinase C activation, and polyol and hexosamine pathways. Other factors that also contribute to oxidative stress in obesity include hyperleptinemia, low antioxidant defense, chronic inflammation, and postprandial reactive oxygen species generation. In addition, recent studies suggest that adipose tissue plays a critical role in regulating the pathophysiological mechanisms of obesity and its related co-morbidities. To establish an adequate platform for the prevention of obesity and its associated health risks, understanding the factors that contribute to the cause of obesity is necessary. The most current list of obesity determinants includes genetic factors, dietary intake, physical activity, environmental and socioeconomic factors, eating disorders, and societal influences. On the basis of the currently identified predominant determinants of obesity, a broad range of strategies have been recommended to reduce the prevalence of obesity, such as regular physical activity, ad libitum food intake limiting to certain micronutrients, increased dietary intake of fruits and vegetables, and meal replacements. This review aims to highlight recent findings regarding the role of oxidative stress in the pathogenesis of obesity and its associated risk factors, the role of dysfunctional adipose tissue in development of these risk factors, and potential strategies to regulate body weight loss/gain for better health benefits.
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Affiliation(s)
- Prasenjit Manna
- Department of Pediatrics, LSU Health Sciences Center , Shreveport, Louisiana
| | - Sushil K Jain
- Department of Pediatrics, LSU Health Sciences Center , Shreveport, Louisiana
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233
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Monoacylglycerol Analysis Using MS/MS(ALL) Quadruple Time of Flight Mass Spectrometry. Metabolites 2016; 6:metabo6030025. [PMID: 27548241 PMCID: PMC5041124 DOI: 10.3390/metabo6030025] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/09/2016] [Accepted: 08/12/2016] [Indexed: 12/15/2022] Open
Abstract
Monoacylglycerols (MAGs) are structural and bioactive metabolites critical for biological function. Development of facile tools for measuring MAG are essential to understand its role in different diseases and various pathways. A data-independent acquisition method, MS/MS(ALL), using electrospray ionization (ESI) coupled quadrupole time of flight mass spectrometry (MS), was utilized for the structural identification and quantitative analysis of individual MAG molecular species. Compared with other acylglycerols, diacylglycerols (DAG) and triacylglycerols (TAG), MAG characteristically presented as a dominant protonated ion, [M + H]⁺, and under low collision energy as fatty acid-like fragments due to the neutral loss of the glycerol head group. At low concentrations (<10 pmol/µL), where lipid-lipid interactions are rare, there was a strong linear correlation between ion abundance and MAG concentration. Moreover, using the MS/MS(ALL) method the major MAG species from human plasma and mouse brown and white adipose tissues were quantified in less than 6 min. Collectively, these results demonstrate that MS/MS(ALL) analysis of MAG is an enabling strategy for the direct identification and quantitative analysis of low level MAG species from biological samples with high throughput and sensitivity.
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234
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Molecular mechanism of hepatic steatosis: pathophysiological role of autophagy. Expert Rev Mol Med 2016; 18:e14. [PMID: 27499351 DOI: 10.1017/erm.2016.14] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
UNLABELLED Steatosis is an early characteristic in the pathogenesis of fatty liver disease (FLD). Mechanisms of hepatic steatosis are aetiology-dependent. Activation of autophagy in liver ameliorates hepatic steatosis. A modulation of hepatic autophagy affects the degree of hepatocyte steatosis and the progression of FLD as demonstrated by pre-clinical models and clinical trials. This review summarises recent advances on pathophysiological roles of autophagy in hepatic lipid metabolism. A comprehensive regulation of autophagic networks holds promise for the improvement of hepatic steatosis. Autophagic signalling pathway may be a novel therapeutic target against FLD. HIGHLIGHTS • Hepatic steatosis is a pathological condition wherein vacuoles of triglyceride (TG) fat are overaccumulated in liver because of abnormal metabolism of lipids. • Hepatic autophagy regulates lipid metabolism as demonstrated by macrolipophagy in response to starvation and hepatic overabundance of TG in obesity. • Autophagic signals are closely associated with apoptotic pathways. There is distinctive relationship between hepatic autophagy and apoptosis, which affects the progression of fatty liver. • Regulation of autophagic process can be a novel therapeutic strategy for fatty liver disease.
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235
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O'Flanagan CH, Bowers LW, Hursting SD. A weighty problem: metabolic perturbations and the obesity-cancer link. Horm Mol Biol Clin Investig 2016; 23:47-57. [PMID: 26167982 DOI: 10.1515/hmbci-2015-0022] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 06/05/2015] [Indexed: 01/03/2023]
Abstract
Obesity is an established risk factor for several cancers, including breast, colon, endometrial, ovarian, gastric, pancreatic and liver, and is increasingly a public health concern. Obese cancer patients often have poorer prognoses, reduced response to standard treatments, and are more likely to develop metastatic disease than normo-weight individuals. Many of the pathologic features of obesity promote tumor growth, such as metabolic perturbations, hormonal and growth factor imbalances, and chronic inflammation. Although obesity exacerbates tumor development, the interconnected relationship between the two conditions presents opportunities for new treatment approaches, some of which may be more successful in obese cohorts. Here, we discuss the many ways in which excess adiposity can impact cancer development and progression and address potential preventive and therapeutic strategies to reduce the burden of obesity-related cancers.
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236
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Pérez LM, Pareja-Galeano H, Sanchis-Gomar F, Emanuele E, Lucia A, Gálvez BG. 'Adipaging': ageing and obesity share biological hallmarks related to a dysfunctional adipose tissue. J Physiol 2016; 594:3187-207. [PMID: 26926488 DOI: 10.1113/jp271691] [Citation(s) in RCA: 116] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Accepted: 01/21/2016] [Indexed: 12/15/2022] Open
Abstract
The increasing ageing of our societies is accompanied by a pandemic of obesity and related cardiometabolic disorders. Progressive dysfunction of the white adipose tissue is increasingly recognized as an important hallmark of the ageing process, which in turn contributes to metabolic alterations, multi-organ damage and a systemic pro-inflammatory state ('inflammageing'). On the other hand, obesity, the paradigm of adipose tissue dysfunction, shares numerous biological similarities with the normal ageing process such as chronic inflammation and multi-system alterations. Accordingly, understanding the interplay between accelerated ageing related to obesity and adipose tissue dysfunction is critical to gain insight into the ageing process in general as well as into the pathophysiology of obesity and other related conditions. Here we postulate the concept of 'adipaging' to illustrate the common links between ageing and obesity and the fact that, to a great extent, obese adults are prematurely aged individuals.
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Affiliation(s)
- Laura M Pérez
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Helios Pareja-Galeano
- Universidad Europea de Madrid, Spain.,Research Institute Hospital 12 de Octubre ('i+12'), Madrid, Spain
| | | | | | - Alejandro Lucia
- Universidad Europea de Madrid, Spain.,Research Institute Hospital 12 de Octubre ('i+12'), Madrid, Spain
| | - Beatriz G Gálvez
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain.,Universidad Europea de Madrid, Spain
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237
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Khovaeva YB, Batalova AA, Golovskoy BV, Gerasimova АV. [The status of large vessels in overweight and obesity according to ultrasound findings]. TERAPEVT ARKH 2016; 88:29-34. [PMID: 27070160 DOI: 10.17116/terarkh201688429-34] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
AIM To investigate the impact of overweight and obesity on the structure and function of large arteries in apparently healthy individuals; to estimate the magnitude of atherosclerotic lesions of the vessels. MATERIALS AND METHODS Sixty-one apparently healthy individuals with varying weights were randomly examined. All the examinees were divided into 3 groups according to their body mass index (BMI) and blood pressure (BP). They all underwent ultrasonography of the brachiocephalic arteries at the extracranial level, as well as the abdominal aorta and femoral arteries. RESULTS The overweight and obese persons have increased diameters and thickness of the intima-media complex of the common carotid arteries and aorta. These changes are maximally pronounced in obesity in conjunction with high normal BP (systolic BP, 130-139 mm Hg; diastolic BP, 85-89 mm Hg). At the same time, there is a reduction in blood flow velocities and an increase in arterial wall stiffness. More marked structural and functional changes are observed in persons with abdominal obesity. The femoral artery belonging to muscular ones exhibited no structural changes, but displayed reduced blood flow velocities in obesity concurrent with high normal BP. In all the groups, the spread of atherosclerotic plaques is equal; the latter are recorded in one third of the examinees. However, the degree and incidence of vascular atherosclerosis are higher in overweight and obesity concurrent with high normal BP. CONCLUSION The overweight and obese persons without cardiovascular diseases were found to have eccentric remodeling of elastic and muscular-and-elastic vessels: the carotid arteries and aorta in conjunction with increased intima-media thickness, reduced blood flow velocities, and atherosclerotic vascular changes. These changes are most pronounced in the obese persons with high normal BP. In all the groups, atherosclerotic changes are encountered mainly in the brachiocephalic arteries at the extracranial level.
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Affiliation(s)
- Ya B Khovaeva
- Acad. E.A. Wagner Perm State Medical University, Ministry of Health of Russia, Perm, Russia
| | - A A Batalova
- Acad. E.A. Wagner Perm State Medical University, Ministry of Health of Russia, Perm, Russia
| | - B V Golovskoy
- Acad. E.A. Wagner Perm State Medical University, Ministry of Health of Russia, Perm, Russia
| | - А V Gerasimova
- Acad. E.A. Wagner Perm State Medical University, Ministry of Health of Russia, Perm, Russia
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238
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Mitochondria in White, Brown, and Beige Adipocytes. Stem Cells Int 2016; 2016:6067349. [PMID: 27073398 PMCID: PMC4814709 DOI: 10.1155/2016/6067349] [Citation(s) in RCA: 147] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 01/17/2016] [Accepted: 01/28/2016] [Indexed: 12/18/2022] Open
Abstract
Mitochondria play a key role in energy metabolism in many tissues, including cardiac and skeletal muscle, brain, liver, and adipose tissue. Three types of adipose depots can be identified in mammals, commonly classified according to their colour appearance: the white (WAT), the brown (BAT), and the beige/brite/brown-like (bAT) adipose tissues. WAT is mainly involved in the storage and mobilization of energy and BAT is predominantly responsible for nonshivering thermogenesis. Recent data suggest that adipocyte mitochondria might play an important role in the development of obesity through defects in mitochondrial lipogenesis and lipolysis, regulation of adipocyte differentiation, apoptosis, production of oxygen radicals, efficiency of oxidative phosphorylation, and regulation of conversion of white adipocytes into brown-like adipocytes. This review summarizes the main characteristics of each adipose tissue subtype and describes morphological and functional modifications focusing on mitochondria and their activity in healthy and unhealthy adipocytes.
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239
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Tang M, Huang C, Wang YF, Ren PG, Chen L, Xiao TX, Wang BB, Pan YF, Tsang BK, Zabel BA, Ma BH, Zhao HY, Zhang JV. CMKLR1 deficiency maintains ovarian steroid production in mice treated chronically with dihydrotestosterone. Sci Rep 2016; 6:21328. [PMID: 26893072 PMCID: PMC4759558 DOI: 10.1038/srep21328] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 12/22/2015] [Indexed: 01/03/2023] Open
Abstract
Elevated serum chemerin levels correlate with increased severity of polycystic ovary syndrome (PCOS). However, the role of CMKLR1 signaling in ovarian biology under conditions of excess DHT remains unclear. In this study we compared the effects of continuous 90-day high dose DHT exposure (83.3 □g/day) on wild type and CMKLR1-deficient mice. DHT induced PCOS-like clinical signs in wild type mice as well as significant changes in the expression of hormone receptors, steroid synthesis enzymes, and BMPs and their receptors. In contrast, CMKLR1-deficient mice significantly attenuated DHT-induced clinical signs of PCOS and alterations in ovarian gene expression. To determine whether the BMP4 signaling pathway was involved in the pathogenic effects of CMKLR1 signaling in DHT-induced ovarian steroidogenesis, antral follicles were isolated from wild type and CMKLR1 knockout (KO) mice and treated in vitro with combinations of hCG, DHT, and BMP4 inhibitors. BMP4 inhibition attenuated the induction effects of hCG and DHT on estrogen and progesterone secretion in CMKLR1 KO mice, but not in WT mice, implicating the BMP4 signaling pathway in the CMKLR1-dependent response to DHT. In conclusion, CMKLR1 gene deletion attenuates the effects of chronic DHT treatment on ovarian function in experimental PCOS, likely via BMP4 signaling.
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Affiliation(s)
- Mi Tang
- College of Veterinary Medicine, Northwest Sci-Tech University of A&F, Yangling, Shanxi, 712100, China.,Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Chen Huang
- Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Yu-Fei Wang
- Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.,University of Science and Technology of China, An-Hui, He-Fei, 230026, China
| | - Pei-Gen Ren
- Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Li Chen
- Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Tian-Xia Xiao
- Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Bao-Bei Wang
- Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Yan-Fei Pan
- Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Benjamin K Tsang
- Department of Obstetrics &Gynaecology, University of Ottawa, Ottawa, Ontario K1H 8L6, Canada.,Chronic Disease Program, Ottawa Hospital Research Institute Ontario K1H 8L6, Canada.,Department of Cellular &Molecular Medicine, University of Ottawa; Ottawa, Ontario K1H 8L6, Canada.,Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Ontario K1H 8L6, Canada
| | - Brian A Zabel
- Palo Alto Veterans Institute for Research, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - Bao-Hua Ma
- College of Veterinary Medicine, Northwest Sci-Tech University of A&F, Yangling, Shanxi, 712100, China
| | - Hui-Ying Zhao
- College of Veterinary Medicine, Northwest Sci-Tech University of A&F, Yangling, Shanxi, 712100, China
| | - Jian V Zhang
- Research Laboratory for Reproductive Health, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
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240
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Hartmann G, Kumar S, Johns D, Gheyas F, Gutstein D, Shen X, Burton A, Lederman H, Lutz R, Jackson T, Chavez-Eng C, Mitra K. Disposition into Adipose Tissue Determines Accumulation and Elimination Kinetics of the Cholesteryl Ester Transfer Protein Inhibitor Anacetrapib in Mice. Drug Metab Dispos 2015; 44:428-34. [DOI: 10.1124/dmd.115.067736] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 12/23/2015] [Indexed: 12/31/2022] Open
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241
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Anti-Obesity Effect of the CB2 Receptor Agonist JWH-015 in Diet-Induced Obese Mice. PLoS One 2015; 10:e0140592. [PMID: 26588700 PMCID: PMC4654496 DOI: 10.1371/journal.pone.0140592] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 09/27/2015] [Indexed: 01/24/2023] Open
Abstract
The cannabinoid receptor 2 (CB2) is well known for its immune modulatory role. However, recent localisation of CB2 receptors in metabolically active tissue suggests that the CB2 receptor plays a significant role in energy homeostasis. This study was designed to investigate the impact of chronic CB2 receptor stimulation on food intake, body weight and mood. Lean male C57BL/6 mice were injected i.p. with the selective CB2 receptor agonist, JWH-015 (0.0, 1.0, 5.0 and 10.0 mg kg-1) to establish dose response parameters. Mice made obese following exposure to a diet consisting of 19.4 MJ/kg (4641 Kcal/kg) of energy (19.0% protein, 21.0% total fat, 4.7% crude fiber, and 4.7% AD fiber were given either vehicle or 10 mg/kg JWH-015. Impact on mood, food intake, body weight, plasma metabolites, expression of key metabolic proteins in the brown adipose tissue (BAT) and white adipose tissue (WAT), and markers of inflammation were measured. High dose (10 mg/kg) JWH-015 reduced food intake after 1, 2, 4, and 24 h in lean mice. When given to diet induced obese (DIO) mice, a 10 mg/kg dose of JWH-015 significantly reduced body weight compared to vehicle. This dose led to a shift in markers of lipid metabolism and inflammation in WAT consistent with lipolysis and improved immune response. Furthermore, JWH-015 (10 mg/kg) produced a transient reduction in food intake and significant reduction in fat mass and adipocyte cell size. Importantly, JWH-015 produced an anxiolytic response in the elevated plus maze while having no effect on immobility time in the forced swim test. It should be noted that though the 10 mg/kg dose produced positive effects on the obese state, the possibility that these effects are mediated via non-CB2 receptor mechanisms cannot be ruled out. These results demonstrate a role for CB2 receptors in modulating energy homeostasis and obesity associated metabolic pathologies in the absence of any adverse impact on mood.
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242
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Kema VH, Mojerla NR, Khan I, Mandal P. Effect of alcohol on adipose tissue: a review on ethanol mediated adipose tissue injury. Adipocyte 2015; 4:225-31. [PMID: 26451277 PMCID: PMC4573182 DOI: 10.1080/21623945.2015.1017170] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 01/30/2015] [Accepted: 02/02/2015] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Alcohol consumption has been in existence in the world for many centuries and it is the major cause of death and injury worldwide. Alcoholic liver disease (ALD) is caused due to excess and chronic alcohol intake. Studies across the globe have identified several pathways leading to ALD. Adipose tissue which has been considered as an energy storage organ is also found to play a major role in ALD progression by secreting hormones and cytokines known as adipokines or adipocytokines. Ethanol affects the metabolic and innate immune activities of adipose tissue contributing to alcohol-induced injury of the tissues. OBJECTIVE We aimed at 1) summarizing the metabolism and progression of ALD 2) summarizing about the structure and effect of ethanol induced oxidative stress on adipose tissue 3) reviewing the available data on the effect of ethanol on adipose tissue mass and adipokine secretion in both rodent models and alcoholic patients. METHODS The article is summarized based on the original literature and reviews in studying the effect of ethanol on adipose tissue. RESULTS Studies on alcoholic patients and rodent models has shown that chronic ethanol consumption reduces adipose tissue mass and causes CYP2E1 mediated oxidative stress and inflammation of adipose tissue. Further hyperlipolysis is observed in adipose tissue that leads to excess fatty acid release that gets transported and deposited in the liver resulting in hepatic steatosis. CONCLUSION Studies show that adipose tissue plays a major role in the progression of ALD. So understanding of the mechanisms linking ethanol induced adipose tissue injury with ALD progression would help us in identifying potential therapeutic targets.
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Affiliation(s)
- Venkata Harini Kema
- Department of Biological Sciences; BITS Pilani; Hyderabad Campus; Hyderabad, India
| | | | - Imran Khan
- Department of Biological Sciences; BITS Pilani; Hyderabad Campus; Hyderabad, India
| | - Palash Mandal
- Department of Biological Sciences; BITS Pilani; Hyderabad Campus; Hyderabad, India
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243
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Expression, regulation and functional assessment of the 80 amino acid Small Adipocyte Factor 1 (Smaf1) protein in adipocytes. Arch Biochem Biophys 2015; 590:27-36. [PMID: 26427354 DOI: 10.1016/j.abb.2015.09.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 09/21/2015] [Accepted: 09/24/2015] [Indexed: 12/22/2022]
Abstract
The gene for Small Adipocyte Factor 1, Smaf1 (also known as adipogenin, ADIG), encodes a ∼600 base transcript that is highly upregulated during 3T3-L1 in vitro adipogenesis and markedly enriched in adipose tissues. Based on the lack of an obvious open reading frame in the Smaf1 transcript, it is not known if the Smaf1 gene is protein coding or non-coding RNA. Using a peptide from a putative open reading frame of Smaf1 as antigen, we generated antibodies for western analysis. Our studies prove that Smaf1 encodes an adipose-enriched protein which in western blot analysis migrates at ∼10 kDa. Rapid induction of Smaf1 protein occurs during in vitro adipogenesis and its expression in 3T3-L1 adipocytes is positively regulated by insulin and glucose. Moreover, siRNA studies reveal that expression of Smaf1 in adipocytes is wholly dependent on PPARγ. On the other hand, use of siRNA for Smaf1 to nearly abolish its protein expression in adipocytes revealed that Smaf1 does not have a major role in adipocyte triglyceride accumulation, lipolysis or insulin-stimulated pAkt induction. However, immunolocalization studies using HA-tagged Smaf1 reveal enrichment at adipocyte lipid droplets. Together our findings show that Smaf1 is a novel small protein endogenous to adipocytes and that Smaf1 expression is closely tied to PPARγ-mediated signals and the adipocyte phenotype.
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244
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Yin F, Sancheti H, Liu Z, Cadenas E. Mitochondrial function in ageing: coordination with signalling and transcriptional pathways. J Physiol 2015; 594:2025-42. [PMID: 26293414 DOI: 10.1113/jp270541] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 08/13/2015] [Indexed: 12/14/2022] Open
Abstract
Mitochondrial dysfunction entailing decreased energy-transducing capacity and perturbed redox homeostasis is an early and sometimes initiating event in ageing and age-related disorders involving tissues with high metabolic rate such as brain, liver and heart. In the central nervous system (CNS), recent findings from our and other groups suggest that the mitochondrion-centred hypometabolism is a key feature of ageing brains and Alzheimer's disease. This hypometabolic state is manifested by lowered neuronal glucose uptake, metabolic shift in the astrocytes, and alternations in mitochondrial tricarboxylic acid cycle function. Similarly, in liver and adipose tissue, mitochondrial capacity around glucose and fatty acid metabolism and thermogenesis is found to decline with age and is implicated in age-related metabolic disorders such as obesity and type 2 diabetes mellitus. These mitochondrion-related disorders in peripheral tissues can impact on brain functions through metabolic, hormonal and inflammatory signals. At the cellular level, studies in CNS and non-CNS tissues support the notion that instead of being viewed as autonomous organelles, mitochondria are part of a dynamic network with close interactions with other cellular components through energy- or redox-sensitive cytosolic kinase signalling and transcriptional pathways. Hence, it would be critical to further understand the molecular mechanisms involved in the communication between mitochondria and the rest of the cell. Therapeutic strategies that effectively preserves or improve mitochondrial function by targeting key component of these signalling cascades could represent a novel direction for numerous mitochondrion-implicated, age-related disorders.
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Affiliation(s)
- Fei Yin
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA
| | - Harsh Sancheti
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA
| | - Zhigang Liu
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA
| | - Enrique Cadenas
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA
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245
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Wang S, Wang X, Ye Z, Xu C, Zhang M, Ruan B, Wei M, Jiang Y, Zhang Y, Wang L, Lei X, Lu Z. Curcumin promotes browning of white adipose tissue in a norepinephrine-dependent way. Biochem Biophys Res Commun 2015; 466:247-53. [PMID: 26362189 DOI: 10.1016/j.bbrc.2015.09.018] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Accepted: 09/04/2015] [Indexed: 12/12/2022]
Abstract
Brown adipose tissue converts energy from food into heat via the mitochondrial uncoupling protein UCP1, defending against cold. In some conditions, inducible 'brown-like' adipocytes, also known as beige adipocytes, can develop within white adipose tissue (WAT). These beige adipocytes have characteristics similar to classical brown adipocytes and thus can burn lipids to produce heat. In the current study, we demonstrated that curcumin (50 or 100 mg/kg/day) decreased bodyweight and fat mass without affecting food intake in mice. We further demonstrated that curcumin improves cold tolerance in mice. This effect was possibly mediated by the emergence of beige adipocytes and the increase of thermogenic gene expression and mitochondrial biogenesis in inguinal WAT. In addition, curcumin promotes β3AR gene expression in inguinal WAT and elevates the levels of plasma norepinephrine, a hormone that can induce WAT browning. Taken together, our data suggest that curcumin can potentially prevent obesity by inducing browning of inguinal WAT via the norepinephrine-β3AR pathway.
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Affiliation(s)
- Shan Wang
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China
| | - Xiuchao Wang
- Department of Psychology, Fourth Military Medical University, Xi'an 710032, PR China
| | - Zichen Ye
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China
| | - Chengming Xu
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China
| | - Ming Zhang
- Department of Neurobiology and Collaborative Innovation Center for Brain Science, School of Basic Medicine, Fourth Military Medical University, Xi'an 710032, PR China
| | - Banjun Ruan
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China
| | - Ming Wei
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China; Department of Pharmacology, Xi'an Medical University, Xi'an 710021, PR China
| | - Yinghao Jiang
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China
| | - Ying Zhang
- Department of Cardiovascular Surgery, Xijing Hospital, The Fourth Military Medical University, Xi'an 710032, PR China
| | - Li Wang
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China
| | - Xiaoying Lei
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China.
| | - Zifan Lu
- State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, Fourth Military Medical University, Xi'an 710032, PR China.
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246
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McNally B, Griffin JL, Roberts LD. Dietary inorganic nitrate: From villain to hero in metabolic disease? Mol Nutr Food Res 2015; 60:67-78. [PMID: 26227946 PMCID: PMC4863140 DOI: 10.1002/mnfr.201500153] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 07/13/2015] [Accepted: 07/23/2015] [Indexed: 12/22/2022]
Abstract
Historically, inorganic nitrate was believed to be an inert by‐product of nitric oxide (NO) metabolism that was readily excreted by the body. Studies utilising doses of nitrate far in excess of dietary and physiological sources reported potentially toxic and carcinogenic effects of the anion. However, nitrate is a significant component of our diets, with the majority of the anion coming from green leafy vegetables, which have been consistently shown to offer protection against obesity, type 2 diabetes and metabolic diseases. The discovery of a metabolic pathway in mammals, in which nitrate is reduced to NO, via nitrite, has warranted a re‐examination of the physiological role of this small molecule. Obesity, type 2 diabetes and the metabolic syndrome are associated with a decrease in NO bioavailability. Recent research suggests that the nitrate‐nitrite‐NO pathway may be harnessed as a therapeutic to supplement circulating NO concentrations, with both anti‐obesity and anti‐diabetic effects, as well as improving vascular function. In this review, we examine the key studies that have led to the re‐evaluation of the physiological function of inorganic nitrate, from toxic and carcinogenic metabolite, to a potentially important and beneficial agent in the treatment of metabolic disease.
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Affiliation(s)
- Ben McNally
- Elsie Widdowson Laboratory, Medical Research Council - Human Nutrition Research, Cambridge, UK.,Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, UK
| | - Julian L Griffin
- Elsie Widdowson Laboratory, Medical Research Council - Human Nutrition Research, Cambridge, UK.,Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, UK
| | - Lee D Roberts
- Elsie Widdowson Laboratory, Medical Research Council - Human Nutrition Research, Cambridge, UK.,Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, UK
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247
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Nirengi S, Yoneshiro T, Sugie H, Saito M, Hamaoka T. Human brown adipose tissue assessed by simple, noninvasive near-infrared time-resolved spectroscopy. Obesity (Silver Spring) 2015; 23:973-80. [PMID: 25866030 DOI: 10.1002/oby.21012] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 11/30/2014] [Indexed: 01/30/2023]
Abstract
OBJECTIVE Human brown adipose tissue (BAT) activity has been typically evaluated by (18) F-fluorodeoxyglucose (FDG)-positron emission tomography (PET) combined with computed tomography (CT). However, FDG-PET/CT has serious limitations (e.g., radiation and cold exposure). This study evaluated BAT density using near-infrared time-resolved spectroscopy (NIRTRS ), a simple and noninvasive method of measuring the indices of tissue hemoglobin concentration [total-Hb] and mitochondrial density (µs '). METHODS The NIRTRS parameters at 760, 800, and 830 nm in the supraclavicular region potentially containing BAT were evaluated. First, the NIRTRS parameters were compared at 27 °C and during a 2-h cold exposure (19 °C) in 18 men. Then, NIRTRS parameters at 27 °C were compared with mean standardized uptake values (SUVmean ) assessed by FDG-PET/CT after the 2-h cold exposure (19 °C) in 29 men. RESULTS There was no significant difference between the NIRTRS parameters at 27 °C and 19°C. The [total-Hb] and µs ' were significantly correlated to SUVmean (r = 0.73 and r = 0.64, respectively). A receiver operating characteristic analysis revealed that the sensitivity (75.0-82.4%), specificity (91.7-100%), and accuracy (82.8-86.2%) of the NIRTRS parameters were all good to determine the NIRTRS reliability. CONCLUSIONS Our novel NIRTRS method is noninvasive and simple and can reliably assess human BAT density in the supraclavicular region.
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Affiliation(s)
- Shinsuke Nirengi
- Graduate School of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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Cornell S. Continual evolution of type 2 diabetes: an update on pathophysiology and emerging treatment options. Ther Clin Risk Manag 2015; 11:621-32. [PMID: 25931824 PMCID: PMC4404882 DOI: 10.2147/tcrm.s67387] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Diabetes is a complex and progressive disease that has a major societal and economic impact. The most common form of diabetes, type 2 diabetes mellitus (T2DM), is a multifactorial disease, the pathophysiology of which involves not only the pancreas but also the liver, skeletal muscle, adipose tissue, gastrointestinal tract, brain, and kidney. Novel therapies with mechanisms of action that are different from most existing drugs are emerging. One such class consists of compounds that inhibit renal sodium-glucose cotransporter 2, which is responsible for the bulk of glucose reabsorption by the kidneys. This new class of compounds improves glycemic control independently of insulin and promotes weight reduction, providing an additional tool to treat patients with T2DM. This review discusses the underlying pathophysiology of T2DM, clinical guidelines, and available and emerging treatment options, with particular emphasis on sodium-glucose cotransporter 2 inhibitors.
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Affiliation(s)
- Susan Cornell
- Chicago College of Pharmacy, Midwestern University, Downers Grove, IL, USA
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249
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Nutrition-dependent changes of mouse adipose tissue compositions monitored by NMR, MS, and chromatographic methods. Anal Bioanal Chem 2015; 407:5113-23. [DOI: 10.1007/s00216-015-8551-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/26/2015] [Accepted: 02/09/2015] [Indexed: 02/07/2023]
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250
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Kim EY, Kim WK, Oh KJ, Han BS, Lee SC, Bae KH. Recent advances in proteomic studies of adipose tissues and adipocytes. Int J Mol Sci 2015; 16:4581-99. [PMID: 25734986 PMCID: PMC4394436 DOI: 10.3390/ijms16034581] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 12/29/2014] [Accepted: 02/16/2015] [Indexed: 12/27/2022] Open
Abstract
Obesity is a chronic disease that is associated with significantly increased levels of risk of a number of metabolic disorders. Despite these enhanced health risks, the worldwide prevalence of obesity has increased dramatically over the past few decades. Obesity is caused by the accumulation of an abnormal amount of body fat in adipose tissue, which is composed mostly of adipocytes. Thus, a deeper understanding of the regulation mechanism of adipose tissue and/or adipocytes can provide a clue for overcoming obesity-related metabolic diseases. In this review, we describe recent advances in the study of adipose tissue and/or adipocytes, focusing on proteomic approaches. In addition, we suggest future research directions for proteomic studies which may lead to novel treatments of obesity and obesity-related diseases.
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Affiliation(s)
- Eun Young Kim
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
| | - Won Kon Kim
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
- Department of Functional Genomics, University of Science and Technology of Korea, Daejeon 305-806, Korea.
| | - Kyoung-Jin Oh
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
| | - Baek Soo Han
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
- Department of Functional Genomics, University of Science and Technology of Korea, Daejeon 305-806, Korea.
| | - Sang Chul Lee
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
- Department of Functional Genomics, University of Science and Technology of Korea, Daejeon 305-806, Korea.
| | - Kwang-Hee Bae
- Functional Genomics Research Center, KRIBB, Daejeon 305-806, Korea.
- Department of Functional Genomics, University of Science and Technology of Korea, Daejeon 305-806, Korea.
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