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Lempicki MD, Gray JA, Abuna G, Murata RM, Divanovic S, McNamara CA, Meher AK. BAFF neutralization impairs the autoantibody-mediated clearance of dead adipocytes and aggravates obesity-induced insulin resistance. Front Immunol 2024; 15:1436900. [PMID: 39185417 PMCID: PMC11341376 DOI: 10.3389/fimmu.2024.1436900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Accepted: 07/22/2024] [Indexed: 08/27/2024] Open
Abstract
B cell-activating factor (BAFF) is a critical TNF-family cytokine that regulates homeostasis and peripheral tolerance of B2 cells. BAFF overproduction promotes autoantibody generation and autoimmune diseases. During obesity, BAFF is predominantly produced by white adipose tissue (WAT), and IgG autoantibodies against adipocytes are identified in the WAT of obese humans. However, it remains to be determined if the autoantibodies formed during obesity affect WAT remodeling and systemic insulin resistance. Here, we show that IgG autoantibodies are generated in high-fat diet (HFD)-induced obese mice that bind to apoptotic adipocytes and promote their phagocytosis by macrophages. Next, using murine models of obesity in which the gonadal WAT undergoes remodeling, we found that BAFF neutralization depleted IgG autoantibodies, increased the number of dead adipocytes, and exacerbated WAT inflammation and insulin resistance. RNA sequencing of the stromal vascular fraction from the WAT revealed decreased expression of immunoglobulin light-chain and heavy-chain variable genes suggesting a decreased repertoire of B cells after BAFF neutralization. Further, the B cell activation and the phagocytosis pathways were impaired in the WAT of BAFF-neutralized mice. In vitro, plasma IgG fractions from BAFF-neutralized mice reduced the phagocytic clearance of apoptotic adipocytes. Altogether, our study suggests that IgG autoantibodies developed during obesity, at least in part, dampens exacerbated WAT inflammation and systemic insulin resistance.
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Affiliation(s)
- Melissa D. Lempicki
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, United States
| | - Jake A. Gray
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, United States
| | - Gabriel Abuna
- School of Dental Medicine, East Carolina University, Greenville, NC, United States
| | - Ramiro M. Murata
- School of Dental Medicine, East Carolina University, Greenville, NC, United States
| | - Senad Divanovic
- Department of Pediatrics University of Cincinnati College of Medicine, Cincinnati, OH, United States
- Division of Immunobiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States
- Center for Inflammation and Tolerance, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States
| | - Coleen A. McNamara
- Cardiovascular Research Center, Cardiovascular Division, Department of Medicine, University of Virginia, Charlottesville, VA, United States
| | - Akshaya K. Meher
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, United States
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Pérez B, Torre-Villalvazo I, Wilson-Verdugo M, Lau-Corona D, Muciño-Olmos E, Coutiño-Hernández D, Noriega-López L, Resendis-Antonio O, Valdés VJ, Torres N, Tovar AR. Epigenetic reprogramming of H3K4me3 in adipose-derived stem cells by HFS diet consumption leads to a disturbed transcriptomic profile in adipocytes. Am J Physiol Endocrinol Metab 2024; 327:E13-E26. [PMID: 38717362 DOI: 10.1152/ajpendo.00093.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/22/2024] [Accepted: 04/30/2024] [Indexed: 06/22/2024]
Abstract
Adipose tissue metabolism is actively involved in the regulation of energy balance. Adipose-derived stem cells (ASCs) play a critical role in maintaining adipose tissue function through their differentiation into mature adipocytes (Ad). This study aimed to investigate the impact of an obesogenic environment on the epigenetic landscape of ASCs and its impact on adipocyte differentiation and its metabolic consequences. Our results showed that ASCs from rats on a high-fat sucrose (HFS) diet displayed reduced adipogenic capacity, increased fat accumulation, and formed larger adipocytes than the control (C) group. Mitochondrial analysis revealed heightened activity in undifferentiated ASC-HFS but decreased respiratory and glycolytic capacity in mature adipocytes. The HFS diet significantly altered the H3K4me3 profile in ASCs on genes related to adipogenesis, mitochondrial function, inflammation, and immunomodulation. After differentiation, adipocytes retained H3K4me3 alterations, confirming the upregulation of genes associated with inflammatory and immunomodulatory pathways. RNA-seq confirmed the upregulation of genes associated with inflammatory and immunomodulatory pathways in adipocytes. Overall, the HFS diet induced significant epigenetic and transcriptomic changes in ASCs, impairing differentiation and causing dysfunctional adipocyte formation.NEW & NOTEWORTHY Obesity is associated with the development of chronic diseases like metabolic syndrome and type 2 diabetes, and adipose tissue plays a crucial role. In a rat model, our study reveals how an obesogenic environment primes adipocyte precursor cells, leading to epigenetic changes that affect inflammation, adipogenesis, and mitochondrial activity after differentiation. We highlight the importance of histone modifications, especially the trimethylation of histone H3 to lysine 4 (H3K4me3), showing its influence on adipocyte expression profiles.
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Affiliation(s)
- Berenice Pérez
- Departamento de Fisiología de la Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Iván Torre-Villalvazo
- Departamento de Fisiología de la Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Martí Wilson-Verdugo
- Departamento de Biología Celular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Dana Lau-Corona
- Departamento de Fisiología de la Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Erick Muciño-Olmos
- Departamento de Biología Celular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
- Laboratorio de Biología de Sistemas, Coordinación de la Investigación Científica - Red de Apoyo a la Investigación - Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México & Instituto Nacional de Medicina Genómica, Mexico City, Mexico
| | - Diana Coutiño-Hernández
- Departamento de Fisiología de la Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Lilia Noriega-López
- Departamento de Fisiología de la Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Osbaldo Resendis-Antonio
- Laboratorio de Biología de Sistemas, Coordinación de la Investigación Científica - Red de Apoyo a la Investigación - Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México & Instituto Nacional de Medicina Genómica, Mexico City, Mexico
| | - Víctor Julián Valdés
- Departamento de Biología Celular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Nimbe Torres
- Departamento de Fisiología de la Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Armando R Tovar
- Departamento de Fisiología de la Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
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Slusher AL, Nouws J, Tokoglu F, Vash-Margita A, Matthews MD, Fitch M, Shankaran M, Hellerstein MK, Caprio S. Altered extracellular matrix dynamics is associated with insulin resistance in adolescent children with obesity. Obesity (Silver Spring) 2024; 32:593-602. [PMID: 38410080 PMCID: PMC11034857 DOI: 10.1002/oby.23974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/27/2023] [Accepted: 11/29/2023] [Indexed: 02/28/2024]
Abstract
OBJECTIVE The objective of this study was to examine the hypothesis that abdominal and gluteal adipocyte turnover, lipid dynamics, and fibrogenesis are dysregulated among insulin-resistant (IR) compared with insulin-sensitive (IS) adolescents with obesity. METHODS Seven IS and seven IR adolescents with obesity participated in a 3-h oral glucose tolerance test and a multi-section magnetic resonance imaging scan of the abdominal region to examine body fat distribution patterns and liver fat content. An 8-week 70% deuterated water (2 H2 O) labeling protocol examined adipocyte turnover, lipid dynamics, and fibrogenesis in vivo from biopsied abdominal and gluteal fat. RESULTS Abdominal and gluteal subcutaneous adipose tissue (SAT) turnover rates of lipid components were similar among IS and IR adolescents with obesity. However, the insoluble collagen (type I, subunit α2) isoform measured from abdominal, but not gluteal, SAT was elevated in IR compared with IS individuals. In addition, abdominal insoluble collagen Iα2 was associated with ratios of visceral-to-total (visceral adipose tissue + SAT) abdominal fat and whole-body and adipose tissue insulin signaling, and it trended toward a positive association with liver fat content. CONCLUSIONS Altered extracellular matrix dynamics, but not expandability, potentially decreases abdominal SAT lipid storage capacity, contributing to the pathophysiological pathways linking adipose tissue and whole-body IR with altered ectopic storage of lipids within the liver among IR adolescents with obesity.
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Affiliation(s)
- Aaron L. Slusher
- Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA
| | - Jessica Nouws
- Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT
| | - Fuyuze Tokoglu
- Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT, USA
| | - Alla Vash-Margita
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale School of Medicine, New Haven, CT, USA
| | - Marcy D. Matthews
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, Berkeley, CA, USA
| | - Mark Fitch
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, Berkeley, CA, USA
| | - Mahalakshmi Shankaran
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, Berkeley, CA, USA
| | - Marc K. Hellerstein
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, Berkeley, CA, USA
| | - Sonia Caprio
- Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA
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Ahmed A, Justo S, Yaghootkar H. Genetic scores associated with favourable and unfavourable adiposity have consistent effect on metabolic profile and disease risk across diverse ethnic groups. Diabet Med 2023; 40:e15213. [PMID: 37638553 DOI: 10.1111/dme.15213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/21/2023] [Accepted: 08/24/2023] [Indexed: 08/29/2023]
Abstract
AIM This study aims to investigate the associations between genetic risk scores (GRS) for favourable and unfavourable adiposity and a wide range of adiposity-related outcomes across diverse populations. METHODS We utilised previously identified variants associated with favourable (36 variants) and unfavourable (38 variants) adiposity to create GRS for each adiposity phenotype. We used summary statistics from 39 outcomes generated by the Pan-UKB genome-wide association studies Version 0.3, incorporating covariates such as age, sex and principal components in six populations: European (n = 420,531), African (6636), American (980), Central/South Asian (8876), East Asian (2709) and Middle Eastern (1599). RESULTS The favourable adiposity GRS was associated with a healthy metabolic profile, including lower risk of type 2 diabetes, lower liver enzyme levels, lower blood pressure, higher HDL-cholesterol, lower triglycerides, higher apolipoprotein A, lower apolipoprotein B, higher testosterone, lower calcium and lower insulin-like growth factor 1 generally consistently across all the populations. In contrast, the unfavourable adiposity GRS was associated with an adverse metabolic profile, including higher risk of type 2 diabetes, higher random glucose levels, higher HbA1c, lower HDL-cholesterol, higher triglycerides, higher liver enzyme levels, lower testosterone, and higher C-reactive protein generally consistently across all the populations. CONCLUSION The study provides evidence that the genetic scores associated with favourable and unfavourable adiposity have consistent effects on metabolic profiles and disease risk across diverse ethnic groups. These findings deepen our understanding of distinct adiposity subtypes and their impact on metabolic health.
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Affiliation(s)
- Altayeb Ahmed
- Department of Life Sciences, Centre for Inflammation Research and Translational Medicine, Brunel University London, London, UK
- Joseph Banks Laboratories, College of Health and Science, University of Lincoln, Lincoln, Lincolnshire, UK
| | - Stephen Justo
- Department of Life Sciences, Centre for Inflammation Research and Translational Medicine, Brunel University London, London, UK
| | - Hanieh Yaghootkar
- Joseph Banks Laboratories, College of Health and Science, University of Lincoln, Lincoln, Lincolnshire, UK
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Dundar I, Akinci A. Prevalence and Predictive Clinical Characteristics of Metabolically Healthy Obesity in Obese Children and Adolescents. Cureus 2023; 15:e35935. [PMID: 37038589 PMCID: PMC10082589 DOI: 10.7759/cureus.35935] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/08/2023] [Indexed: 03/11/2023] Open
Abstract
BACKGROUND The increasing prevalence of childhood obesity and accompanying comorbidities all over the world constitutes one of the most important public health problems of the changing world. The frequency and causes of the metabolically healthy obesity (MHO) phenotype in children is not clear. OBJECTIVE The objective is to determine the prevalence of the MHO phenotype in obese Turkish children and adolescents and to identify clinical and biochemical indicators for this phenotype. METHODS Eight hundred forty-seven obese children and adolescents, aged 3-18 years with BMI-SDS >+2 SD from the obesity outpatient clinic were included. Demographic, anthropometric, and physical examination information was collected from patient medical files. In addition, obesity-related comorbidities and results of laboratory tests were obtained. For study purposes, obese patients with no cardiometabolic risk factors were accepted as MHO, and those with ≥1 cardiometabolic risk factor were considered metabolically unhealthy obese (MUO). MHO was defined according to Damanhoury's criteria. RESULTS Out of 847 children (mean age 10.6±3.4 years) who met the study criteria, 289 (34.1%) were diagnosed with MHO. Being younger, prepubertal, having relatively low BMI, low waist/hip ratio, low insulin resistance (HOMA-IR) index, high high-density lipoprotein, low triglyceride, low fasting insulin and glucose levels, low uric acid and low alanine transaminase (ALT) levels were associated with MHO. CONCLUSIONS The MHO phenotype was present in just over a third of this obese pediatric cohort. The most important factors associated with MHO; age, waist-hip ratio, and BMI were determined.
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Affiliation(s)
- Ismail Dundar
- Pediatric Endocrinology Department, Inonu University, Faculty of Medicine, Malatya, TUR
| | - Aysehan Akinci
- Pediatric Endocrinology Department, Inonu University, Faculty of Medicine, Malatya, TUR
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Abstract
While most tissues exhibit their greatest growth during development, adipose tissue is capable of additional massive expansion in adults. Adipose tissue expandability is advantageous when temporarily storing fuel for use during fasting, but becomes pathological upon continuous food intake, leading to obesity and its many comorbidities. The dense vasculature of adipose tissue provides necessary oxygen and nutrients, and supports delivery of fuel to and from adipocytes under fed or fasting conditions. Moreover, the vasculature of adipose tissue comprises a major niche for multipotent progenitor cells, which give rise to new adipocytes and are necessary for tissue repair. Given the multiple, pivotal roles of the adipose tissue vasculature, impairments in angiogenic capacity may underlie obesity-associated diseases such as diabetes and cardiometabolic disease. Exciting new studies on the single-cell and single-nuclei composition of adipose tissues in mouse and humans are providing new insights into mechanisms of adipose tissue angiogenesis. Moreover, new modes of intercellular communication involving micro vesicle and exosome transfer of proteins, nucleic acids and organelles are also being recognized to play key roles. This review focuses on new insights on the cellular and signaling mechanisms underlying adipose tissue angiogenesis, and on their impact on obesity and its pathophysiological consequences.
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Zhao M, Du W, Zhao Q, Chen Y, Li B, Xie Z, Fu Z, Zhang N, Cheng X, Li X, Yao S, Wang M, Wang C, Wu S, Xue H, Li Y. Transition of Metabolic Phenotypes and Risk of Atrial Fibrillation According to BMI: Kailuan Study. Front Cardiovasc Med 2022; 9:888062. [PMID: 35837597 PMCID: PMC9274110 DOI: 10.3389/fcvm.2022.888062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 05/13/2022] [Indexed: 11/13/2022] Open
Abstract
ObjectiveAtrial fibrillation (AF) is associated with both obesity and its metabolic consequences. However, there is a paucity of information on whether the dynamic change of metabolic health and obesity phenotypes affect the risk of AF. We aimed to prospectively examine the association between metabolic health and its change over time and AF risk across body mass index (BMI) categories.MethodsA total of 58,483 participants without history of cancer, and cardiovascular diseases from the Kailuan study were included in the present study. Transition of metabolic phenotypes was evaluated between 1st survey (2006–2007) and the 2nd survey (2008–2009). The hazard ratios (HRs) and 95% confidence intervals (CIs) for AF were assessed by Cox proportional hazards regression.ResultsDuring a median follow-up of 3 years, we documented 580 cases of AF. Compared with metabolically healthy individuals with normal weight, the multivariable-adjusted hazard ratios for metabolically healthy and unhealthy overweight/obese were 1.27 (95% CI: 1.01, 1.59) and 1.37 (95% CI: 1.09, 1.72), respectively. However, when transition was taken into account, overweight/obese people who maintained metabolically healthy status were not associated with increased long-term risk (HR, 1.11;95% CI: 0.70, 1.78), whereas participants who converted from metabolically healthy overweight/obese status to an unhealthy phenotype had higher AF risk than those who maintained metabolically healthy normal weight (HR 1.59, 95% CI: 1.11, 2.26). When BMI and metabolically healthy status were updated over the course of the study, significant short-term elevations in AF risk were associated with individuals with stable MU-OW/OB status.ConclusionIn this community-based cohort study, metabolically healthy overweight/obese individuals have increased risks of AF. Obesity remains a risk factor for AF independent of major metabolic factors. Our data further suggested that metabolic phenotype was a dynamic condition, and maintenance of metabolic health and normal weight might alleviate the risk of AF.
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Affiliation(s)
- Maoxiang Zhao
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Wenjuan Du
- Laboratory of Radiation Injury Treatment, Medical Innovation Research Division, PLA General Hospital, Beijing, China
| | - Qianqian Zhao
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Yating Chen
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Bin Li
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Zhonghui Xie
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Zihao Fu
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Nan Zhang
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Xiaowei Cheng
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Xiaoqian Li
- Department of Cardiology, Fujian Medical University, Fuzhou, China
| | - Siyu Yao
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Miao Wang
- School of Medicine, Nankai University, Tianjin, China
| | - Chi Wang
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
| | - Shouling Wu
- Department of Cardiology, Kailuan Hospital, Tangshan, China
- *Correspondence: Shouling Wu,
| | - Hao Xue
- Department of Cardiology, Sixth Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
- Hao Xue,
| | - Yang Li
- Department of Cardiology, First Medical Center, Chinese People’s Liberation Army Hospital, Medical School of Chinese People’s Liberation Army, Beijing, China
- Yang Li,
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Sun W, Zhang T, Hu S, Tang Q, Long X, Yang X, Gun S, Chen L. Chromatin accessibility landscape of stromal subpopulations reveals distinct metabolic and inflammatory features of porcine subcutaneous and visceral adipose tissue. PeerJ 2022; 10:e13250. [PMID: 35646489 PMCID: PMC9138157 DOI: 10.7717/peerj.13250] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 03/21/2022] [Indexed: 01/13/2023] Open
Abstract
Background Fat accumulation in visceral adipose tissue (VAT) confers increased risk for metabolic disorders of obesity, whereas accumulation of subcutaneous adipose tissue (SAT) is associated with lower risk and may be protective. Previous studies have shed light on the gene expression profile differences between SAT and VAT; however, the chromatin accessibility landscape differences and how the cis-regulatory elements govern gene expression changes between SAT and VAT are unknown. Methods Pig were used to characterize the differences in chromatin accessibility between the two adipose depots-derived stromal vascular fractions (SVFs) using DNase-sequencing (DNase-seq). Using integrated data from DNase-seq, H3K27ac ChIP-sequencing (ChIP-seq), and RNA-sequencing (RNA-seq), we investigated how the regulatory locus complexity regulated gene expression changes between SAT and VAT and the possible impact that these changes may have on the different biological functions of these two adipose depots. Results SVFs form SAT and VAT (S-SVF and V-SVF) have differential chromatin accessibility landscapes. The differential DNase I hypersensitive site (DHS)-associated genes, which indicate dynamic chromatin accessibility, were mainly involved in metabolic processes and inflammatory responses. Additionally, the Krüppel-like factor family of transcription factors were enriched in the differential DHSs. Furthermore, the chromatin accessibility data were highly associated with differential gene expression as indicated using H3K27ac ChIP-seq and RNA-seq data, supporting the validity of the differential gene expression determined using DNase-seq. Moreover, by combining epigenetic and transcriptomic data, we identified two candidate genes, NR1D1 and CRYM, could be crucial to regulate distinct metabolic and inflammatory characteristics between SAT and VAT. Together, these results uncovered differences in the transcription regulatory network and enriched the mechanistic understanding of the different biological functions between SAT and VAT.
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Affiliation(s)
- Wenyang Sun
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, Gansu, China,Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, China
| | - Tinghuan Zhang
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, China
| | - Silu Hu
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Qianzi Tang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Xi Long
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, China
| | - Xu Yang
- College of Nursing, Ningxia Medical University, Yinchuan, Ningxia, China
| | - Shuangbao Gun
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Lei Chen
- Key Laboratory of Pig Industry Sciences (Ministry of Agriculture), Chongqing Academy of Animal Science, Chongqing, China
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Li Y, Li Z, Ngandiri DA, Llerins Perez M, Wolf A, Wang Y. The Molecular Brakes of Adipose Tissue Lipolysis. Front Physiol 2022; 13:826314. [PMID: 35283787 PMCID: PMC8907745 DOI: 10.3389/fphys.2022.826314] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/10/2022] [Indexed: 12/11/2022] Open
Abstract
Adaptation to changes in energy availability is pivotal for the survival of animals. Adipose tissue, the body’s largest reservoir of energy and a major source of metabolic fuel, exerts a buffering function for fluctuations in nutrient availability. This functional plasticity ranges from energy storage in the form of triglycerides during periods of excess energy intake to energy mobilization via lipolysis in the form of free fatty acids for other organs during states of energy demands. The subtle balance between energy storage and mobilization is important for whole-body energy homeostasis; its disruption has been implicated as contributing to the development of insulin resistance, type 2 diabetes and cancer cachexia. As a result, adipocyte lipolysis is tightly regulated by complex regulatory mechanisms involving lipases and hormonal and biochemical signals that have opposing effects. In thermogenic brown and brite adipocytes, lipolysis stimulation is the canonical way for the activation of non-shivering thermogenesis. Lipolysis proceeds in an orderly and delicately regulated manner, with stimulation through cell-surface receptors via neurotransmitters, hormones, and autocrine/paracrine factors that activate various intracellular signal transduction pathways and increase kinase activity. The subsequent phosphorylation of perilipins, lipases, and cofactors initiates the translocation of key lipases from the cytoplasm to lipid droplets and enables protein-protein interactions to assemble the lipolytic machinery on the scaffolding perilipins at the surface of lipid droplets. Although activation of lipolysis has been well studied, the feedback fine-tuning is less well appreciated. This review focuses on the molecular brakes of lipolysis and discusses some of the divergent fine-tuning strategies in the negative feedback regulation of lipolysis, including delicate negative feedback loops, intermediary lipid metabolites-mediated allosteric regulation and dynamic protein–protein interactions. As aberrant adipocyte lipolysis is involved in various metabolic diseases and releasing the brakes on lipolysis in thermogenic adipocytes may activate thermogenesis, targeting adipocyte lipolysis is thus of therapeutic interest.
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Pro- and anti-inflammatory adipokines are associated with cardiometabolic risk markers in Brazilian schoolchildren. Eur J Pediatr 2021; 180:2931-2941. [PMID: 33834274 DOI: 10.1007/s00431-021-04040-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 03/16/2021] [Accepted: 03/21/2021] [Indexed: 12/12/2022]
Abstract
Pro- and anti-inflammatory adipokines have been regarded as potential markers of obesity and cardiometabolic comorbidities. However, few studies have evaluated this association in children. We aimed to evaluate the relationship between adipokine concentrations and cardiometabolic risk markers in Brazilian schoolchildren. This was a cross-sectional study with 378 children aged 8-9 years from Viçosa, Minas Gerais, Brazil. We measured adipokines (leptin, retinol-binding protein 4, adiponectin, and chemerin) and cardiometabolic risk markers (fasting glucose, HOMA-IR, lipid profile, and blood pressure). Cardiometabolic risk markers were compared by quintiles of adipokines with linear regression adjusted for potential confounders. Leptin was positively associated with diastolic blood pressure (P = 0.03) and HOMA-IR (P = 0.01), and retinol-binding protein 4 was positively associated with total cholesterol (P = 0.04). Each standard deviation of leptin and retinol-binding protein 4 was associated to, respectively, a 0.1 (95%CI: 0.1; 0.2), 0.3 (95%CI: 0.1; 0.6), and 2.5 (95%CI: 0.1; 4.9) units increase in diastolic blood pressure, HOMA-IR, and total cholesterol. Adiponectin was negatively associated with diastolic blood pressure (P = 0.01) and HOMA-IR (P = 0.01), and chemerin was negatively associated with glucose (P = 0.001). Each standard deviation of adiponectin and chemerin was associated to, respectively, a -0.1 (95%CI: -0.2; -0.1), -0.2 (95%CI: -0.3; -0.1), and -1.2 (95%CI: -1.9; -0.5) units decrease in diastolic blood pressure, HOMA-IR, and glucose.Conclusion: Pro- and anti-inflammatory adipokines were positively and negatively associated with cardiometabolic risk markers, respectively, among schoolchildren, indicating this relationship may be identified at earlier ages. What is Known: • Although leptin, retinol-binding protein 4, and adiponectin are well-known adipokines, a consensus regarding their relationship with cardiometabolic risk markers, especially in schoolchildren, has not yet been reached. • Chemerin is an adipokine that has been studied recently. Yet, due to its dependence on the target cell type, its functions are still a controversial topic. What is New: • Leptin was positively associated with diastolic blood pressure and HOMA-IR, and retinol-binding protein 4 was positively associated with total cholesterol. • Adiponectin was negatively associated with diastolic blood pressure and HOMA-IR, and chemerin was negatively associated with glucose.
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Sun C, Kovacs P, Guiu-Jurado E. Genetics of Body Fat Distribution: Comparative Analyses in Populations with European, Asian and African Ancestries. Genes (Basel) 2021; 12:genes12060841. [PMID: 34072523 PMCID: PMC8228180 DOI: 10.3390/genes12060841] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 05/26/2021] [Accepted: 05/27/2021] [Indexed: 12/16/2022] Open
Abstract
Preferential fat accumulation in visceral vs. subcutaneous depots makes obese individuals more prone to metabolic complications. Body fat distribution (FD) is regulated by genetics. FD patterns vary across ethnic groups independent of obesity. Asians have more and Africans have less visceral fat compared with Europeans. Consequently, Asians tend to be more susceptible to type 2 diabetes even with lower BMIs when compared with Europeans. To date, genome-wide association studies (GWAS) have identified more than 460 loci related to FD traits. However, the majority of these data were generated in European populations. In this review, we aimed to summarize recent advances in FD genetics with a focus on comparisons between European and non-European populations (Asians and Africans). We therefore not only compared FD-related susceptibility loci identified in three ethnicities but also discussed whether known genetic variants might explain the FD pattern heterogeneity across different ancestries. Moreover, we describe several novel candidate genes potentially regulating FD, including NID2, HECTD4 and GNAS, identified in studies with Asian populations. It is of note that in agreement with current knowledge, most of the proposed FD candidate genes found in Asians belong to the group of developmental genes.
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Affiliation(s)
- Chang Sun
- Medical Department III-Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
| | - Peter Kovacs
- Medical Department III-Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
| | - Esther Guiu-Jurado
- Medical Department III-Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
- Deutsches Zentrum für Diabetesforschung, 85764 Neuherberg, Germany
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12
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Carpentier AC. 100 th anniversary of the discovery of insulin perspective: insulin and adipose tissue fatty acid metabolism. Am J Physiol Endocrinol Metab 2021; 320:E653-E670. [PMID: 33522398 DOI: 10.1152/ajpendo.00620.2020] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Insulin inhibits systemic nonesterified fatty acid (NEFA) flux to a greater degree than glucose or any other metabolite. This remarkable effect is mainly due to insulin-mediated inhibition of intracellular triglyceride (TG) lipolysis in adipose tissues and is essential to prevent diabetic ketoacidosis, but also to limit the potential lipotoxic effects of NEFA in lean tissues that contribute to the development of diabetes complications. Insulin also regulates adipose tissue fatty acid esterification, glycerol and TG synthesis, lipogenesis, and possibly oxidation, contributing to the trapping of dietary fatty acids in the postprandial state. Excess NEFA flux at a given insulin level has been used to define in vivo adipose tissue insulin resistance. Adipose tissue insulin resistance defined in this fashion has been associated with several dysmetabolic features and complications of diabetes, but the mechanistic significance of this concept is not fully understood. This review focusses on the in vivo regulation of adipose tissue fatty acid metabolism by insulin and the mechanistic significance of the current definition of adipose tissue insulin resistance. One hundred years after the discovery of insulin and despite decades of investigations, much is still to be understood about the multifaceted in vivo actions of this hormone on adipose tissue fatty acid metabolism.
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Affiliation(s)
- André C Carpentier
- Division of Endocrinology, Department of Medicine, Centre de recherche du CHUS, Université de Sherbrooke, Sherbrooke, Quebec, Canada
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13
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Bosy-Westphal A, Müller MJ. Diagnosis of obesity based on body composition-associated health risks-Time for a change in paradigm. Obes Rev 2021; 22 Suppl 2:e13190. [PMID: 33480098 DOI: 10.1111/obr.13190] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 12/07/2020] [Indexed: 12/14/2022]
Abstract
Traditional diagnosis and understanding of the pathophysiology of obesity are based on excessive fat storage due to a chronically positive energy balance characterized by body mass index (BMI). Quantitative and qualitative analysis of lean and adipose tissue compartments by body composition analysis reveals that characterization of obesity as "overfat" does not facilitate a comprehensive understanding of obesity-associated health risk. Instead of being related to fat mass, body composition characteristics underlying BMI-associated prognosis may depend (i) on accelerated growth by a gain in lean mass or fat-free mass (FFM) in children with early BMI rebound or adolescents with early puberty; (ii) on a low muscle mass in aging, associated chronic disease, or severe illness; and (iii) on impaired adipose tissue expandability with respect to cardiometabolic risk. It is therefore time to call the adipocentric paradigm of obesity into question and to avoid the use of BMI and body fat percentage. By contrast, obesity should be seen in face of a limited FFM/muscle mass together with a limited capacity of fat storage.
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Affiliation(s)
- Anja Bosy-Westphal
- Institut für Humanernährung und Lebensmittelkunde, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Manfred J Müller
- Institut für Humanernährung und Lebensmittelkunde, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
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14
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Hydes T, Alam U, Cuthbertson DJ. The Impact of Macronutrient Intake on Non-alcoholic Fatty Liver Disease (NAFLD): Too Much Fat, Too Much Carbohydrate, or Just Too Many Calories? Front Nutr 2021; 8:640557. [PMID: 33665203 PMCID: PMC7921724 DOI: 10.3389/fnut.2021.640557] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 01/27/2021] [Indexed: 12/13/2022] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a growing epidemic, in parallel with the obesity crisis, rapidly becoming one of the commonest causes of chronic liver disease worldwide. Diet and physical activity are important determinants of liver fat accumulation related to insulin resistance, dysfunctional adipose tissue, and secondary impaired lipid storage and/or increased lipolysis. While it is evident that a hypercaloric diet (an overconsumption of calories) promotes liver fat accumulation, it is also clear that the macronutrient composition can modulate this risk. A number of other baseline factors modify the overfeeding response, which may be genetic or environmental. Although it is difficult to disentangle the effects of excess calories vs. specifically the individual effects of excessive carbohydrates and/or fats, isocaloric, and hypercaloric dietary intervention studies have been implemented to provide insight into the effects of different macronutrients, sub-types and their relative balance, on the regulation of liver fat. What has emerged is that different types of fat and carbohydrates differentially influence liver fat accumulation, even when diets are isocaloric. Furthermore, distinct molecular and metabolic pathways mediate the effects of carbohydrates and fat intake on hepatic steatosis. Fat accumulation appears to act through impairments in lipid storage and/or increased lipolysis, whereas carbohydrate consumption has been shown to promote liver fat accumulation through de novo lipogenesis. Effects differ dependent upon carbohydrate and fat type. Saturated fat and fructose induce the greatest increase in intrahepatic triglycerides (IHTG), insulin resistance, and harmful ceramides compared with unsaturated fats, which have been found to be protective. Decreased intake of saturated fats and avoidance of added sugars are therefore the two most important dietary interventions that can lead to a reduction in IHTG and potentially the associated risk of developing type 2 diabetes. A healthy and balanced diet and regular physical activity must remain the cornerstones of effective lifestyle intervention to prevent the development and progression of NAFLD. Considering the sub-type of each macronutrient, in addition to the quantity, are critical determinants of liver health.
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Affiliation(s)
- Theresa Hydes
- Department of Metabolic and Cardiovascular Medicine, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom.,Liverpool University Hospitals NHS Foundation Trust, Liverpool, United Kingdom
| | - Uazman Alam
- Department of Metabolic and Cardiovascular Medicine, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom.,Liverpool University Hospitals NHS Foundation Trust, Liverpool, United Kingdom
| | - Daniel J Cuthbertson
- Department of Metabolic and Cardiovascular Medicine, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom.,Liverpool University Hospitals NHS Foundation Trust, Liverpool, United Kingdom
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15
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Wolf RM, Nagpal M, Magge SN. Diabetes and cardiometabolic risk in South Asian youth: A review. Pediatr Diabetes 2021; 22:52-66. [PMID: 32666595 PMCID: PMC8191592 DOI: 10.1111/pedi.13078] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 05/22/2020] [Accepted: 06/02/2020] [Indexed: 12/15/2022] Open
Abstract
South Asians are at increased risk for developing type 2 diabetes and cardiovascular disease at lower body mass index compared to other ancestral groups. Many factors contribute to this increased risk, including genetics, maternal-fetal factors, diet, fitness, body composition, and unique pathophysiology. Increased cardiometabolic risk is also seen at younger ages in South Asian individuals as compared to their White counterparts. This risk persists in migrant communities outside of South Asia. With the growing prevalence of obesity, diabetes, and cardiovascular disease in the South Asian population, it is imperative that we had better understand the mechanisms underlying this increased risk and implement strategies to address this growing public health problem during childhood and adolescence.
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Affiliation(s)
- Risa M Wolf
- Department of Pediatrics, Division of Endocrinology and Diabetes, Johns Hopkins University School of Medicine
| | - Mohika Nagpal
- Department of Pediatrics, Division of Endocrinology and Diabetes, Johns Hopkins University School of Medicine
| | - Sheela N. Magge
- Department of Pediatrics, Division of Endocrinology and Diabetes, Johns Hopkins University School of Medicine
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16
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Zhen S, Cai R, Yang X, Ma Y, Wen D. Association of Serum Galectin-3-Binding Protein and Metabolic Syndrome in a Chinese Adult Population. Front Endocrinol (Lausanne) 2021; 12:726154. [PMID: 34858323 PMCID: PMC8631730 DOI: 10.3389/fendo.2021.726154] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 06/16/2021] [Accepted: 09/23/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Galectin-3-binding protein (GAL-3BP) is a ubiquitous and multifunctional secreted glycoprotein, which functions in innate immunity and has been highlighted as a potential mediator of adipose inflammation in obesity. In this study, we aimed to identify whether GAL-3BP is a novel biological marker for metabolic syndrome (MetS). METHODS The biochemical and anthropometric variables of the 570 participants in this study were evaluated using standard procedures. Their serum GAL-3BP levels were measured using enzyme-linked immunosorbent assay (ELISA), while the association between the glycoprotein and MetS was analyzed using multiple logistic regression analyses. Moreover, an experimental MetS model was established. The expression of GAL-3BP in serum and adipose tissue was measured using ELISA and western blotting. Lipid accumulation was determined with the use of immunohistochemistry and immunofluorescent staining. RESULTS The serum GAL-3BP level was found to be positively associated with MetS. The logistic regression analyses demonstrated that participants expressing the upper levels of GAL-3BP were more likely to develop MetS than those expressing less of the glycoprotein (OR = 2.39, 95%CI: 1.49, 3.83). The association between the serum GAL-3BP level and MetS was found preferentially in postmenopausal women (OR = 2.30, 95%CI: 1.31, 4.05). In addition, GAL-3BP was increased in the serum and visceral adipose tissue (VAT) of high fat diet (HFD) mice. Moreover, GAL-3BP was highly expressed in VAT macrophages. CONCLUSIONS This study confirmed serum GAL-3BP to be positively associated with MetS, highlighting it as a useful biological marker of MetS in Chinese participants.
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Affiliation(s)
- Shihan Zhen
- Institute of Health Sciences, China Medical University, Shenyang, China
| | - Ruoxin Cai
- Institute of Health Sciences, China Medical University, Shenyang, China
| | - Xuelian Yang
- Institute of Health Sciences, China Medical University, Shenyang, China
| | - Yanan Ma
- School of Public Health, China Medical University, Shenyang, China
| | - Deliang Wen
- Institute of Health Sciences, China Medical University, Shenyang, China
- *Correspondence: Deliang Wen,
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17
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Rehman K, Tahir A, Niaz S, Shabbir S, Jabeen K, Faheem A, Akash MSH. Frequency of PPAR-γ, FTO and ABCC8 genetic variation in Pakistani cardiovascular smokers. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:42611-42620. [PMID: 32712935 DOI: 10.1007/s11356-020-10226-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 07/20/2020] [Indexed: 06/11/2023]
Abstract
Smoking is considered as one of the major reasons behind genetic variations in cardiometabolic disorders. However, effect of nicotine via smoking on Pakistani population still needs to be elucidated. This study was aimed to investigate genetic variation among PPAR-γ, FTO, and ABCC8 genes in cardiometabolic patients along with their biochemical parameters. A total of 472 CVD patients were enrolled in this study and divided into three groups; n = 144 for PPAR-γ (C/G) variation and n = 164 in each group to investigate FTO (T/A) and ABCC8 (G/T) variation, respectively. Polymorphisms within groups were identified by using Tetra and/or Tri ARM-PCR. This study showed positive association among genetic polymorphisms in PPAR-γ, FTO, and ABCC8 groups with altered metabolic parameters in CVD patients. Findings showed that smoking is major contributory factor for genetic polymorphism that was strongly associated with elevated blood glucose and serum TGs accompanying PPAR-γ, FTO, and ABCC8 genetic polymorphism in 25%, 24%, and 20% in smokers and 11%, 10%, and 5% in non-smoker CVD patients, respectively. However, highest polymorphism occurred in PPAR-γ both in smokers and non-smoker CVD patients that show that smoking-mediated gene polymorphism might be a contributory factor in provoking CVD risk approximately twice in smokers as compared to that in non-smoker CVD patients.
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Affiliation(s)
- Kanwal Rehman
- Department of Pharmacy, University of Agriculture, Faisalabad, Pakistan
- Institute of Physiology and Pharmacology, University of Agriculture, Faisalabad, Pakistan
| | - Ayesha Tahir
- Institute of Physiology and Pharmacology, University of Agriculture, Faisalabad, Pakistan
| | - Sania Niaz
- Institute of Physiology and Pharmacology, University of Agriculture, Faisalabad, Pakistan
| | - Sara Shabbir
- Department of Pharmacy, University of Agriculture, Faisalabad, Pakistan
| | - Komal Jabeen
- Department of Pharmacy, University of Agriculture, Faisalabad, Pakistan
- Institute of Physiology and Pharmacology, University of Agriculture, Faisalabad, Pakistan
| | - Amna Faheem
- Institute of Physiology and Pharmacology, University of Agriculture, Faisalabad, Pakistan
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18
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Gao Z, Daquinag AC, Fussell C, Zhao Z, Dai Y, Rivera A, Snyder BE, Eckel-Mahan KL, Kolonin MG. Age-associated telomere attrition in adipocyte progenitors predisposes to metabolic disease. Nat Metab 2020; 2:1482-1497. [PMID: 33324010 DOI: 10.1038/s42255-020-00320-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 11/04/2020] [Indexed: 01/11/2023]
Abstract
White and beige adipocytes in subcutaneous adipose tissue (SAT) and visceral adipose tissue (VAT) are maintained by proliferation and differentiation of adipose progenitor cells (APCs). Here we use mice with tissue-specific telomerase reverse transcriptase (TERT) gene knockout (KO), which undergo premature telomere shortening and proliferative senescence in APCs, to investigate the effect of over-nutrition on APC exhaustion and metabolic dysfunction. We find that TERT KO in the Pdgfra+ cell lineage results in adipocyte hypertrophy, inflammation and fibrosis in SAT, while TERT KO in the Pdgfrb+ lineage leads to adipocyte hypertrophy in both SAT and VAT. Systemic insulin resistance is observed in both KO models and is aggravated by a high-fat diet. Analysis of human biopsies demonstrates that telomere shortening in SAT is associated with metabolic disease progression after bariatric surgery. Our data indicate that over-nutrition can promote APC senescence and provide a mechanistic link between ageing, obesity and diabetes.
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Affiliation(s)
- Zhanguo Gao
- Institute of Molecular Medicine, McGovern Medical School at the University of Texas Health Science Center, Houston, TX, USA
| | - Alexes C Daquinag
- Institute of Molecular Medicine, McGovern Medical School at the University of Texas Health Science Center, Houston, TX, USA
| | - Cale Fussell
- Institute of Molecular Medicine, McGovern Medical School at the University of Texas Health Science Center, Houston, TX, USA
| | - Zhongming Zhao
- Center for Precision Health, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Yulin Dai
- Center for Precision Health, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | | | - Brad E Snyder
- Memorial Hermann Texas Medical Center, Houston, TX, USA
| | - Kristin L Eckel-Mahan
- Institute of Molecular Medicine, McGovern Medical School at the University of Texas Health Science Center, Houston, TX, USA
| | - Mikhail G Kolonin
- Institute of Molecular Medicine, McGovern Medical School at the University of Texas Health Science Center, Houston, TX, USA.
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19
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Gao M, Lv J, Yu C, Guo Y, Bian Z, Yang R, Du H, Yang L, Chen Y, Li Z, Zhang X, Chen J, Qi L, Chen Z, Huang T, Li L. Metabolically healthy obesity, transition to unhealthy metabolic status, and vascular disease in Chinese adults: A cohort study. PLoS Med 2020; 17:e1003351. [PMID: 33125374 PMCID: PMC7598496 DOI: 10.1371/journal.pmed.1003351] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 09/11/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Metabolically healthy obesity (MHO) and its transition to unhealthy metabolic status have been associated with risk of cardiovascular disease (CVD) in Western populations. However, it is unclear to what extent metabolic health changes over time and whether such transition affects risks of subtypes of CVD in Chinese adults. We aimed to examine the association of metabolic health status and its transition with risks of subtypes of vascular disease across body mass index (BMI) categories. METHODS AND FINDINGS The China Kadoorie Biobank was conducted during 25 June 2004 to 15 July 2008 in 5 urban (Harbin, Qingdao, Suzhou, Liuzhou, and Haikou) and 5 rural (Henan, Gansu, Sichuan, Zhejiang, and Hunan) regions across China. BMI and metabolic health information were collected. We classified participants into BMI categories: normal weight (BMI 18.5-23.9 kg/m²), overweight (BMI 24.0-27.9 kg/m²), and obese (BMI ≥ 28 kg/m²). Metabolic health was defined as meeting less than 2 of the following 4 criteria (elevated waist circumference, hypertension, elevated plasma glucose level, and dyslipidemia). The changes in obesity and metabolic health status were defined from baseline to the second resurvey with combination of overweight and obesity. Among the 458,246 participants with complete information and no history of CVD and cancer, the mean age at baseline was 50.9 (SD 10.4) years, and 40.8% were men, and 29.0% were current smokers. During a median 10.0 years of follow-up, 52,251 major vascular events (MVEs), including 7,326 major coronary events (MCEs), 37,992 ischemic heart disease (IHD), and 42,951 strokes were recorded. Compared with metabolically healthy normal weight (MHN), baseline MHO was associated with higher hazard ratios (HRs) for all types of CVD; however, almost 40% of those participants transitioned to metabolically unhealthy status. Stable metabolically unhealthy overweight or obesity (MUOO) (HR 2.22, 95% confidence interval [CI] 2.00-2.47, p < 0.001) and transition from metabolically healthy to unhealthy status (HR 1.53, 1.34-1.75, p < 0.001) were associated with higher risk for MVE, compared with stable healthy normal weight. Similar patterns were observed for MCE, IHD, and stroke. Limitations of the analysis included lack of measurement of lipid components, fasting plasma glucose, and visceral fat, and there might be possible misclassification. CONCLUSIONS Among Chinese adults, MHO individuals have increased risks of MVE. Obesity remains a risk factor for CVD independent of major metabolic factors. Our data further suggest that metabolic health is a transient state for a large proportion of Chinese adults, with the highest vascular risk among those remained MUOO.
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Affiliation(s)
- Meng Gao
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
| | - Jun Lv
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
- Key Laboratory of Molecular Cardiovascular Sciences (Peking University), Ministry of Education, Beijing, China
- Peking University Institute of Environmental Medicine, Beijing, China
| | - Canqing Yu
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
| | - Yu Guo
- Chinese Academy of Medical Sciences, Beijing, China
| | - Zheng Bian
- Chinese Academy of Medical Sciences, Beijing, China
| | - Ruotong Yang
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
| | - Huaidong Du
- Medical Research Council Population Health Research Unit at the University of Oxford, Oxford, United Kingdom
- Clinical Trial Service Unit & Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom
| | - Ling Yang
- Medical Research Council Population Health Research Unit at the University of Oxford, Oxford, United Kingdom
- Clinical Trial Service Unit & Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom
| | - Yiping Chen
- Medical Research Council Population Health Research Unit at the University of Oxford, Oxford, United Kingdom
- Clinical Trial Service Unit & Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom
| | - Zhongxiao Li
- Maiji Center for Disease Control and Prevention, Maiji, Gansu, China
| | - Xi Zhang
- Maiji Center for Disease Control and Prevention, Maiji, Gansu, China
| | - Junshi Chen
- China National Center for Food Safety Risk Assessment, Beijing, China
| | - Lu Qi
- Department of Epidemiology, School of Public Health and Tropical Medicine, Tulane University, New Orleans, Louisiana, United States of America
- Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, United States of America
| | - Zhengming Chen
- Clinical Trial Service Unit & Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom
| | - Tao Huang
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
- Key Laboratory of Molecular Cardiovascular Sciences (Peking University), Ministry of Education, Beijing, China
| | - Liming Li
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
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Valencak TG, Spenlingwimmer T, Nimphy R, Reinisch I, Hoffman JM, Prokesch A. Challenging a "Cushy" Life: Potential Roles of Thermogenesis and Adipose Tissue Adaptations in Delayed Aging of Ames and Snell Dwarf Mice. Metabolites 2020; 10:E176. [PMID: 32365727 PMCID: PMC7281452 DOI: 10.3390/metabo10050176] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/23/2020] [Accepted: 04/27/2020] [Indexed: 02/07/2023] Open
Abstract
Laboratory mouse models with genetically altered growth hormone (GH) signaling and subsequent endocrine disruptions, have longer lifespans than control littermates. As such, these mice are commonly examined to determine the role of the somatotropic axis as it relates to healthspan and longevity in mammals. The two most prominent mouse mutants in this context are the genetically dwarf Ames and Snell models which have been studied extensively for over two decades. However, it has only been proposed recently that both white and brown adipose tissue depots may contribute to their delayed aging. Here we review the current state of the field and supplement it with recent data from our labs.
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Affiliation(s)
- Teresa G. Valencak
- College of Animal Sciences, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, Hangzhou 310058, China
- Department of Biomedical Sciences, Institute of Physiology, Pathophysiology and Biophysics, University of Veterinary Medicine, Veterinärplatz 1, A-1210 Vienna, Austria; (T.S.); (R.N.)
| | - Tanja Spenlingwimmer
- Department of Biomedical Sciences, Institute of Physiology, Pathophysiology and Biophysics, University of Veterinary Medicine, Veterinärplatz 1, A-1210 Vienna, Austria; (T.S.); (R.N.)
| | - Ricarda Nimphy
- Department of Biomedical Sciences, Institute of Physiology, Pathophysiology and Biophysics, University of Veterinary Medicine, Veterinärplatz 1, A-1210 Vienna, Austria; (T.S.); (R.N.)
| | - Isabel Reinisch
- Division of Cell Biology, Histology and Embryology, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Neue Stiftingtalstrasse 6, 8010 Graz, Austria; (I.R.); (A.P.)
| | - Jessica M. Hoffman
- Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., CH464, Birmingham, AL 35294, USA;
| | - Andreas Prokesch
- Division of Cell Biology, Histology and Embryology, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Neue Stiftingtalstrasse 6, 8010 Graz, Austria; (I.R.); (A.P.)
- BioTechMed-Graz, Mozartgasse 12/II, 8010 Graz, Austria
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21
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Eckel-Mahan K, Ribas Latre A, Kolonin MG. Adipose Stromal Cell Expansion and Exhaustion: Mechanisms and Consequences. Cells 2020; 9:cells9040863. [PMID: 32252348 PMCID: PMC7226766 DOI: 10.3390/cells9040863] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 03/12/2020] [Accepted: 03/17/2020] [Indexed: 12/13/2022] Open
Abstract
Adipose tissue (AT) is comprised of a diverse number of cell types, including adipocytes, stromal cells, endothelial cells, and infiltrating leukocytes. Adipose stromal cells (ASCs) are a mixed population containing adipose progenitor cells (APCs) as well as fibro-inflammatory precursors and cells supporting the vasculature. There is growing evidence that the ability of ASCs to renew and undergo adipogenesis into new, healthy adipocytes is a hallmark of healthy fat, preventing disease-inducing adipocyte hypertrophy and the spillover of lipids into other organs, such as the liver and muscles. However, there is building evidence indicating that the ability for ASCs to self-renew is not infinite. With rates of ASC proliferation and adipogenesis tightly controlled by diet and the circadian clock, the capacity to maintain healthy AT via the generation of new, healthy adipocytes appears to be tightly regulated. Here, we review the contributions of ASCs to the maintenance of distinct adipocyte pools as well as pathogenic fibroblasts in cancer and fibrosis. We also discuss aging and diet-induced obesity as factors that might lead to ASC senescence, and the consequences for metabolic health.
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Affiliation(s)
- Kristin Eckel-Mahan
- Institute of Molecular Medicine, McGovern Medical School at the University of Texas Health Science Center, Houston, TX 77030, USA;
| | - Aleix Ribas Latre
- Helmholtz Institute for Metabolic, Obesity and Vascular Research Center, D-04103 Leipzig, Germany;
| | - Mikhail G. Kolonin
- Institute of Molecular Medicine, McGovern Medical School at the University of Texas Health Science Center, Houston, TX 77030, USA;
- Correspondence:
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22
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Caprio S, Santoro N, Weiss R. Childhood obesity and the associated rise in cardiometabolic complications. Nat Metab 2020; 2:223-232. [PMID: 32694781 PMCID: PMC9425367 DOI: 10.1038/s42255-020-0183-z] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 02/17/2020] [Indexed: 02/06/2023]
Abstract
Childhood obesity is one of the most serious global public-health challenges of the twenty-first century. Over the past four decades, the number of children and adolescents with obesity has risen more than tenfold. Worldwide, an increasing number of youth are facing greater exposure to obesity throughout their lives, and this increase will contribute to the early development of type 2 diabetes, fatty liver and cardiovascular complications. Herein, we provide a brief overview of trends in the global shifts in, and environmental and genetic determinants of, childhood obesity. We then discuss recent progress in the elucidation of the central role of insulin resistance, the key element linking obesity and cardiovascular-risk-factor clustering, and the potential mechanisms through which ectopic lipid accumulation leads to insulin resistance and its associated cardiometabolic complications in obese adolescents. In the absence of effective prevention and intervention programs, childhood obesity will have severe public-health consequences for decades to come.
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Affiliation(s)
- Sonia Caprio
- Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA.
| | - Nicola Santoro
- Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA.
| | - Ram Weiss
- Department of Pediatrics, Ruth Rappaport Children's Hospital, Rambam Medical Center, Technion School of Medicine, Haifa, Israel.
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Varela-Rodríguez BM, Juiz-Valiña P, Varela L, Outeiriño-Blanco E, Bravo SB, García-Brao MJ, Mena E, Noguera JF, Valero-Gasalla J, Cordido F, Sangiao-Alvarellos S. Beneficial Effects of Bariatric Surgery-Induced by Weight Loss on the Proteome of Abdominal Subcutaneous Adipose Tissue. J Clin Med 2020; 9:jcm9010213. [PMID: 31941045 PMCID: PMC7019912 DOI: 10.3390/jcm9010213] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 12/20/2019] [Accepted: 01/08/2020] [Indexed: 12/16/2022] Open
Abstract
Bariatric surgery (BS) is the most effective treatment for obesity and has a positive impact on cardiometabolic risk and in the remission of type 2 diabetes. Following BS, the majority of fat mass is lost from the subcutaneous adipose tissue depot (SAT). However, the changes in this depot and functions and as well as its relative contribution to the beneficial effects of this surgery are still controversial. With the aim of studying altered proteins and molecular pathways in abdominal SAT (aSAT) after body weight normalization induced by BS, we carried out a proteomic approach sequential window acquisition of all theoretical mass spectra (SWATH-MS) analysis. These results were complemented by Western blot, electron microscopy and RT-qPCR. With all of the working tools mentioned, we confirmed that after BS, up-regulated proteins were associated with metabolism, the citric acid cycle and respiratory electron transport, triglyceride catabolism and metabolism, formation of ATP, pyruvate metabolism, glycolysis/gluconeogenesis and thermogenesis among others. In contrast, proteins with decreased values are part of the biological pathways related to the immune system. We also confirmed that obesity caused a significant decrease in mitochondrial density and coverage, which was corrected by BS. Together, these findings reveal specific molecular mechanisms, genes and proteins that improve adipose tissue function after BS characterized by lower inflammation, increased glucose uptake, higher insulin sensitivity, higher de novo lipogenesis, increased mitochondrial function and decreased adipocyte size.
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Affiliation(s)
- Bárbara María Varela-Rodríguez
- Endocrine, Nutritional and Metabolic Diseases Group, Faculty of Health Sciences, Universidade da Coruña, Campus de Oza, 15006 A Coruña, Spain; (B.M.V.-R.); (P.J.-V.); (F.C.)
- INIBIC (Instituto de Investigación Biomédica de A Coruña), Xubias de Arriba, 84. 15006 A Coruña, Spain
- CICA (Centro de Investigaciones Científicas Avanzadas), As Carballeiras, s/n Campus de, San Vicente de Elviña, 15008 A Coruña, Spain
| | - Paula Juiz-Valiña
- Endocrine, Nutritional and Metabolic Diseases Group, Faculty of Health Sciences, Universidade da Coruña, Campus de Oza, 15006 A Coruña, Spain; (B.M.V.-R.); (P.J.-V.); (F.C.)
- INIBIC (Instituto de Investigación Biomédica de A Coruña), Xubias de Arriba, 84. 15006 A Coruña, Spain
- CICA (Centro de Investigaciones Científicas Avanzadas), As Carballeiras, s/n Campus de, San Vicente de Elviña, 15008 A Coruña, Spain
| | - Luis Varela
- Program in Integrative Cell Signaling and Neurobiology of Metabolism, Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT 06520, USA;
| | - Elena Outeiriño-Blanco
- Department of Endocrinology, Hospital Universitario A Coruña, A Coruña, 15006 A Coruña, Spain;
| | - Susana Belén Bravo
- Proteomic Unit, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, 15705 A Coruña, Spain;
| | - María Jesús García-Brao
- Department of Digestive and General Surgery, Hospital Universitario A Coruña, 15006 A Coruña, Spain; (M.J.G.-B.); (E.M.); (J.F.N.)
| | - Enrique Mena
- Department of Digestive and General Surgery, Hospital Universitario A Coruña, 15006 A Coruña, Spain; (M.J.G.-B.); (E.M.); (J.F.N.)
| | - José Francisco Noguera
- Department of Digestive and General Surgery, Hospital Universitario A Coruña, 15006 A Coruña, Spain; (M.J.G.-B.); (E.M.); (J.F.N.)
| | - Javier Valero-Gasalla
- Department of Plastic, Reconstructive & Aesthetic Surgery. Hospital Universitario A Coruña, 15006 A Coruña, Spain;
| | - Fernando Cordido
- Endocrine, Nutritional and Metabolic Diseases Group, Faculty of Health Sciences, Universidade da Coruña, Campus de Oza, 15006 A Coruña, Spain; (B.M.V.-R.); (P.J.-V.); (F.C.)
- INIBIC (Instituto de Investigación Biomédica de A Coruña), Xubias de Arriba, 84. 15006 A Coruña, Spain
- CICA (Centro de Investigaciones Científicas Avanzadas), As Carballeiras, s/n Campus de, San Vicente de Elviña, 15008 A Coruña, Spain
- Department of Endocrinology, Hospital Universitario A Coruña, A Coruña, 15006 A Coruña, Spain;
| | - Susana Sangiao-Alvarellos
- Endocrine, Nutritional and Metabolic Diseases Group, Faculty of Health Sciences, Universidade da Coruña, Campus de Oza, 15006 A Coruña, Spain; (B.M.V.-R.); (P.J.-V.); (F.C.)
- INIBIC (Instituto de Investigación Biomédica de A Coruña), Xubias de Arriba, 84. 15006 A Coruña, Spain
- CICA (Centro de Investigaciones Científicas Avanzadas), As Carballeiras, s/n Campus de, San Vicente de Elviña, 15008 A Coruña, Spain
- Correspondence:
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Juárez-Rojas JG, Torre-Villalvazo I, Medina-Urrutia AX, Reyes-Barrera J, Sainz-Escárrega VH, Posadas-Romero C, Macías-Cruz A, Jorge-Galarza E. Participation of white adipose tissue dysfunction on circulating HDL cholesterol and HDL particle size in apparently healthy humans. Int J Obes (Lond) 2019; 44:920-928. [PMID: 31792333 DOI: 10.1038/s41366-019-0493-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 10/15/2019] [Accepted: 11/17/2019] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To use the combined presence of the elevated insulin resistance index in adipose tissue (Adipo-IR) and low values of adiponectin as a marker of dysfunctional adipose tissue, and to analyze its possible association with low values of high-density lipoprotein cholesterol (HDL-C) and small size of HDL particles. RESEARCH DESIGN AND METHODS The analysis included 253 subjects with functional adipose tissue and 253 with dysfunctional adipose tissue, considering similar gender, age, and body mass index (BMI). Adipo-IR was considered when index values (free fatty acids × insulin concentrations) were ≥75th percentile. Low levels of adiponectin were considered when concentration in serum was <25th percentile (determined by ELISA). HDL size was estimated by a quantitative validated equation. Small HDL size was considered when values were <25th percentile. RESULTS When comparing subjects with functional adipose tissue with those of dysfunctional adipose tissue, the latter had a higher prevalence of low HDL-C (51.4% vs. 64.0%; p = 0.004) and small HDL (56.9% vs. 67.6%; p = 0.009). Multivariate analysis indicated that independently from other metabolic risk factors, dysfunction of adipose tissue is significantly associated with low HDL-C (OR: 1.624 [CI 95%: 1.100-2.397]) and small HDL (OR: 1.462 [CI 95%: 1.000-2.139]). Adding BMI, waist circumference, and subcutaneous or visceral adipose tissue did not modify the association. CONCLUSIONS Dysfunction of adipose tissue is associated with a 65 and 50% higher probability of having low HDL-C and small HDL. Identification of dysfunctional adipose tissue could be a useful tool in the clinical setting to prevent the cardiometabolic risk independently from adiposity.
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Affiliation(s)
- Juan G Juárez-Rojas
- Department of Endocrinology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Ivan Torre-Villalvazo
- Department of Nutrition Physiology, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Aida X Medina-Urrutia
- Department of Endocrinology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Juan Reyes-Barrera
- Department of Endocrinology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Víctor H Sainz-Escárrega
- Department of Cardiothoracic Surgery, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Carlos Posadas-Romero
- Department of Endocrinology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Alejandro Macías-Cruz
- Department of Endocrinology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Esteban Jorge-Galarza
- Department of Endocrinology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico.
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López-Bermejo A, Prats-Puig A, Osiniri I, Martínez-Calcerrada JM, Bassols J. Perirenal and epicardial fat and their association with carotid intima-media thickness in children. Ann Pediatr Endocrinol Metab 2019; 24:220-225. [PMID: 31905440 PMCID: PMC6944860 DOI: 10.6065/apem.2019.24.4.220] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 12/16/2019] [Indexed: 12/28/2022] Open
Abstract
Recent data suggest that subclinical atherosclerosis is more related to visceral adipose tissue distribution than to overall fat mass. Both perirenal fat and epicardial fat are visceral fat depots surrounding the kidneys and the myocardium, respectively, which can be easily assessed by ultrasound. Their clinical relevance in children is largely unknown. This review describes studies relating perirenal and epicardial fat to cardiovascular disease or carotid intima-media thickness (cIMT), a well-established surrogate for subclinical atherosclerosis, and discusses this in context with our own data from children. In adults, both perirenal and epicardial fat are useful biological markers of visceral obesity. The former has been related to hypertension in overweight subjects and with atherosclerosis in patients with human immunodeficiency virus. The latter was associated with several metabolic syndrome components and with calcification of the carotid artery. In healthy prepubertal children, both epicardial and perirenal fat thickness, rather than total body fat mass, were related to cIMT. Ultrasonography measures of perirenal and epicardial fat are related to atherosclerosis in adults and may be convenient tools for the assessment of cardiometabolic risk in children.
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Affiliation(s)
- Abel López-Bermejo
- Pediatric Endocrinology, Girona Institute for Biomedical Research, Girona, Spain,Pediatrics, Dr. Josep Trueta Hospital, Girona, Spain,Address for correspondence: Abel López-Bermejo, MD Pediatric Endocrinology, Girona Institute for Biomedical Research, Av. França s/n, 17007 Girona, Spain Tel: +34-972- 940200 (Ext. 2810) Fax: +34-972-940270 E-mail:
| | - Anna Prats-Puig
- Department of Physical Therapy, EUSES University School, University of Girona, Salt, Spain
| | | | | | - Judit Bassols
- Maternal & Fetal Metabolic Research, Girona Institute for Biomedical Research, Salt, Spain
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Cioffi CE, Welsh JA, Alvarez JA, Hartman TJ, Narayan KMV, Vos MB. Associations of Added Sugar from All Sources and Sugar-Sweetened Beverages with Regional Fat Deposition in US Adolescents: NHANES 1999-2006. Curr Dev Nutr 2019; 3:nzz130. [PMID: 32154500 PMCID: PMC7053569 DOI: 10.1093/cdn/nzz130] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 10/24/2019] [Accepted: 11/07/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The relative distribution of upper- versus lower-body fat may be an important determinant of cardiometabolic disease risk in youths. Dietary components associated with adolescent regional body fat distribution require further investigation. OBJECTIVE To evaluate associations of added sugar intake overall and from sugar-sweetened beverages (SSBs) with relative upper-body fat deposition in US adolescents. METHODS This was a cross-sectional analysis of data from 6585 adolescents (aged 12-19 y) in the NHANES cycles 1999-2006. Trunk, leg, and total fat mass were assessed by DXA. Participants were grouped into categories of total and SSB added sugar intake as a percentage of total energy intake (TEI) in 5% increments. Stepwise multivariable linear regression was used to examine associations of added sugar intake with truncal-to-leg fat ratio (TLR) and truncal-to-total fat ratio (TTR). RESULTS There were no associations of total added sugar intake with TLR or TTR. For SSB added sugar, compared with the lowest category of intake (<2% TEI), the highest category (>22% TEI) was associated with higher log-TLR [β (95% CI): >22% TEI versus <2% TEI: 0.05 (0.01, 0.09)] and TTR [1.30 (0.53, 2.07)] in the partially adjusted model with sex, age, race/ethnicity, income, physical activity, and smoking status as covariates (P-trend = 0.0001 for both). When BMI z-score and TEI were added as covariates, the magnitude of the associations were attenuated, but remained significant [log-TLR β (95% CI): 0.03 (0.005, 0.06), P-trend = 0.0018; TTR β (95% CI): 0.75 (0.27, 1.23), P-trend = 0.0004]. CONCLUSIONS These findings support that added sugar from beverages is associated with higher upper-body adiposity, though the magnitude and clinical significance of the associations may be small, especially when adjusted for BMI and TEI. Additional studies are needed to elucidate the underlying biological mechanisms to explain these findings.
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Affiliation(s)
- Catherine E Cioffi
- Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, GA, USA
| | - Jean A Welsh
- Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, GA, USA
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, USA
- Department of Gastroenterology, Hepatology, and Nutrition, Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Jessica A Alvarez
- Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, GA, USA
- Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Terryl J Hartman
- Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, GA, USA
- Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - K M Venkat Narayan
- Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, GA, USA
- Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - Miriam B Vos
- Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, GA, USA
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, USA
- Department of Gastroenterology, Hepatology, and Nutrition, Children's Healthcare of Atlanta, Atlanta, GA, USA
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27
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Park KM, Park SC, Kang S. Effects of resistance exercise on adipokine factors and body composition in pre- and postmenopausal women. J Exerc Rehabil 2019; 15:676-682. [PMID: 31723556 PMCID: PMC6834705 DOI: 10.12965/jer.1938368.184] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 08/06/2019] [Indexed: 01/09/2023] Open
Abstract
The objective of the present study was to examine effects of resistance exercise for 12 weeks on adipokine factors and body composition in postmenopausal (POM) women to provide basic data for preventing obesity or metabolic syndrome caused by menopause. Subjects of this study were 35 premenopausal (PRM) and POM women with body fat percentages of 30% or more. They were divided into PRM (n=15) and POM (n=20) groups. All subjects participated in resistance exercise training for 12 weeks. All serum samples were submitted for enzyme-linked immunosorbent assay measurements of adipokine factors. Body weight, muscle mass, body mass index, and waist-to-hip ration showed significant differences between the two groups after training. In contrast, body fat percentage did not differ between the groups, although it was significantly lower in the PRM group after exercise. Physical fitness was significant differences between the two groups after training, including grip strength (left and right), sit and reach, sit-ups, and standing long jump. In addition, grip strength (left), sit-up, and side step tests were significantly increased after exercise in the PRM group. There were the significant differences in interleukin-6 and leptin levels between the two groups after training. Interleukin-6, interleukin-15, and adiponectin levels were significantly higher in both groups after training compared to those before training, although leptin levels were significantly lower after exercise in the PRM group. Regular resistance exercise was found to be effective in decreasing body fat in PRM women, and decreased leptin and increased adiponectin were positively significant in both groups.
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Affiliation(s)
- Kyu Min Park
- Laboratory of Exercise Physiology, Department of Sport Science, College of Art, Culture and Engineering, Kangwon National University, Chuncheon, Korea
| | - Sung Chul Park
- Department of Rehabilitation Exercise and Health, Busan Institute of Science and Technology, Busan, Korea
| | - Sunghwun Kang
- Laboratory of Exercise Physiology, Department of Sport Science, College of Art, Culture and Engineering, Kangwon National University, Chuncheon, Korea
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28
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Lake JE, Debroy P, Ng D, Erlandson KM, Kingsley LA, Palella FJ, Budoff MJ, Post WS, Brown TT. Associations between subcutaneous fat density and systemic inflammation differ by HIV serostatus and are independent of fat quantity. Eur J Endocrinol 2019; 181:451-459. [PMID: 31430720 PMCID: PMC6992471 DOI: 10.1530/eje-19-0296] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 08/20/2019] [Indexed: 11/08/2022]
Abstract
OBJECTIVES Adipose tissue (AT) density measurement may provide information about AT quality among people living with HIV. We assessed AT density and evaluated relationships between AT density and immunometabolic biomarker concentrations in men with HIV. DESIGN Cross-sectional analysis of men enrolled in the Multicenter AIDS Cohort Study. METHODS Abdominal visceral adipose tissue (VAT) and subcutaneous adipose tissue (SAT) density (Hounsfield units, HU; less negative = more dense) were quantified from computed tomography (CT) scans. Multivariate linear regression models described relationships between abdominal AT density and circulating biomarker concentrations. RESULTS HIV+ men had denser SAT (-95 vs -98 HU HIV-, P < 0.001), whereas VAT density was equivalent by HIV serostatus men (382 HIV-, 462 HIV+). Historical thymidine analog nucleoside reverse transcriptase inhibitor (tNRTI) use was associated with denser SAT but not VAT. In adjusted models, a 1 s.d. greater SAT or VAT density was associated with higher levels of adiponectin, leptin, HOMA-IR and triglyceride:HDL cholesterol ratio and lower hs-CRP concentrations in HIV- men. Conversely, in HIV+ men, each s.d. greater SAT density was not associated with metabolic parameter improvements and was significantly (P < 0.05) associated with higher systemic inflammation. Trends toward higher inflammatory biomarker concentrations per 1 s.d. greater VAT density were also observed among HIV+ men. CONCLUSIONS Among men living with HIV, greater SAT density was associated with greater systemic inflammation independent of SAT area. AT density measurement provides additional insight into AT density beyond measurement of AT quantity alone, and may have implications for metabolic disease risk.
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Affiliation(s)
- J E Lake
- University of Texas Health Sciences Center, Houston, Texas, USA
| | - P Debroy
- University of Texas Health Sciences Center, Houston, Texas, USA
| | - D Ng
- Johns Hopkins University, Baltimore, Maryland, USA
| | | | - L A Kingsley
- University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - F J Palella
- Northwestern University, Chicago, Illinois, USA
| | - M J Budoff
- Torrance Los Angeles Biomedical Research Institute, Torrence, California, USA
| | - W S Post
- Johns Hopkins University, Baltimore, Maryland, USA
| | - T T Brown
- Johns Hopkins University, Baltimore, Maryland, USA
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29
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Kompella P, Vasquez KM. Obesity and cancer: A mechanistic overview of metabolic changes in obesity that impact genetic instability. Mol Carcinog 2019; 58:1531-1550. [PMID: 31168912 PMCID: PMC6692207 DOI: 10.1002/mc.23048] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 05/08/2019] [Accepted: 05/10/2019] [Indexed: 12/16/2022]
Abstract
Obesity, defined as a state of positive energy balance with a body mass index exceeding 30 kg/m2 in adults and 95th percentile in children, is an increasing global concern. Approximately one-third of the world's population is overweight or obese, and in the United States alone, obesity affects one in six children. Meta-analysis studies suggest that obesity increases the likelihood of developing several types of cancer, and with poorer outcomes, especially in children. The contribution of obesity to cancer risk requires a better understanding of the association between obesity-induced metabolic changes and its impact on genomic instability, which is a major driving force of tumorigenesis. In this review, we discuss how molecular changes during adipose tissue dysregulation can result in oxidative stress and subsequent DNA damage. This represents one of the many critical steps connecting obesity and cancer since oxidative DNA lesions can result in cancer-associated genetic instability. In addition, the by-products of the oxidative degradation of lipids (e.g., malondialdehyde, 4-hydroxynonenal, and acrolein), and gut microbiota-mediated secondary bile acid metabolites (e.g., deoxycholic acid and lithocholic acid), can function as genotoxic agents and tumor promoters. We also discuss how obesity can impact DNA repair efficiency, potentially contributing to cancer initiation and progression. Finally, we outline obesity-related epigenetic changes and identify the gaps in knowledge to be addressed for the development of better therapeutic strategies for the prevention and treatment of obesity-related cancers.
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Affiliation(s)
- Pallavi Kompella
- Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Dell Pediatric Research Institute, 1400 Barbara Jordan Boulevard, Austin, TX 78723, USA
| | - Karen M. Vasquez
- Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Dell Pediatric Research Institute, 1400 Barbara Jordan Boulevard, Austin, TX 78723, USA
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30
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Paek J, Park SE, Lu Q, Park KT, Cho M, Oh JM, Kwon KW, Yi YS, Song JW, Edelstein HI, Ishibashi J, Yang W, Myerson JW, Kiseleva RY, Aprelev P, Hood ED, Stambolian D, Seale P, Muzykantov VR, Huh D. Microphysiological Engineering of Self-Assembled and Perfusable Microvascular Beds for the Production of Vascularized Three-Dimensional Human Microtissues. ACS NANO 2019; 13:7627-7643. [PMID: 31194909 DOI: 10.1021/acsnano.9b00686] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The vasculature is an essential component of the circulatory system that plays a vital role in the development, homeostasis, and disease of various organs in the human body. The ability to emulate the architecture and transport function of blood vessels in the integrated context of their associated organs represents an important requirement for studying a wide range of physiological processes. Traditional in vitro models of the vasculature, however, largely fail to offer such capabilities. Here we combine microfluidic three-dimensional (3D) cell culture with the principle of vasculogenic self-assembly to engineer perfusable 3D microvascular beds in vitro. Our system is created in a micropatterned hydrogel construct housed in an elastomeric microdevice that enables coculture of primary human vascular endothelial cells and fibroblasts to achieve de novo formation, anastomosis, and controlled perfusion of 3D vascular networks. An open-top chamber design adopted in this hybrid platform also makes it possible to integrate the microengineered 3D vasculature with other cell types to recapitulate organ-specific cellular heterogeneity and structural organization of vascularized human tissues. Using these capabilities, we developed stem cell-derived microphysiological models of vascularized human adipose tissue and the blood-retinal barrier. Our approach was also leveraged to construct a 3D organotypic model of vascularized human lung adenocarcinoma as a high-content drug screening platform to simulate intravascular delivery, tumor-killing effects, and vascular toxicity of a clinical chemotherapeutic agent. Furthermore, we demonstrated the potential of our platform for applications in nanomedicine by creating microengineered models of vascular inflammation to evaluate a nanoengineered drug delivery system based on active targeting liposomal nanocarriers. These results represent a significant improvement in our ability to model the complexity of native human tissues and may provide a basis for developing predictive preclinical models for biopharmaceutical applications.
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31
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Lobular architecture of human adipose tissue defines the niche and fate of progenitor cells. Nat Commun 2019; 10:2549. [PMID: 31186409 PMCID: PMC6560121 DOI: 10.1038/s41467-019-09992-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 04/12/2019] [Indexed: 01/07/2023] Open
Abstract
Human adipose tissue (hAT) is constituted of structural units termed lobules, the organization of which remains to be defined. Here we report that lobules are composed of two extracellular matrix compartments, i.e., septa and stroma, delineating niches of CD45-/CD34+/CD31- progenitor subsets characterized by MSCA1 (ALPL) and CD271 (NGFR) expression. MSCA1+ adipogenic subset is enriched in stroma while septa contains mainly MSCA1-/CD271- and MSCA1-/CD271high progenitors. CD271 marks myofibroblast precursors and NGF ligand activation is a molecular relay of TGFβ-induced myofibroblast conversion. In human subcutaneous (SC) and visceral (VS) AT, the progenitor subset repartition is different, modulated by obesity and in favor of adipocyte and myofibroblast fate, respectively. Lobules exhibit depot-specific architecture with marked fibrous septa containing mesothelial-like progenitor cells in VSAT. Thus, the human AT lobule organization in specific progenitor subset domains defines the fat depot intrinsic capacity to remodel and may contribute to obesity-associated cardiometabolic risks.
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32
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Sadie-Van Gijsen H. Adipocyte biology: It is time to upgrade to a new model. J Cell Physiol 2018; 234:2399-2425. [PMID: 30192004 DOI: 10.1002/jcp.27266] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 07/25/2018] [Indexed: 12/15/2022]
Abstract
Globally, the obesity pandemic is profoundly affecting quality of life and economic productivity, but efforts to address this, especially on a pharmacological level, have generally proven unsuccessful to date, serving as a stark demonstration that our understanding of adipocyte biology and pathophysiology is incomplete. To deliver better insight into adipocyte function and obesity, we need improved adipocyte models with a high degree of fidelity in representing the in vivo state and with a diverse range of experimental applications. Adipocyte cell lines, especially 3T3-L1 cells, have been used extensively over many years, but these are limited in terms of relevance and versatility. In this review, I propose that primary adipose-derived stromal/stem cells (ASCs) present a superior model with which to study adipocyte biology ex vivo. In particular, ASCs afford us the opportunity to study adipocytes from different, functionally distinct, adipose depots and to investigate, by means of in vivo/ex vivo studies, the effects of many different physiological and pathophysiological factors, such as age, body weight, hormonal status, diet and nutraceuticals, as well as disease and pharmacological treatments, on the biology of adipocytes and their precursors. This study will give an overview of the characteristics of ASCs and published studies utilizing ASCs, to highlight the areas where our knowledge is lacking. More comprehensive studies in primary ASCs will contribute to an improved understanding of adipose tissue, in healthy and dysfunctional states, which will enhance our efforts to more successfully manage and treat obesity.
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Affiliation(s)
- Hanél Sadie-Van Gijsen
- Division of Endocrinology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Parow, South Africa.,Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Parow, South Africa
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33
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Mendez-Sanchez N, Cruz-Ramon VC, Ramirez-Perez OL, Hwang JP, Barranco-Fragoso B, Cordova-Gallardo J. New Aspects of Lipotoxicity in Nonalcoholic Steatohepatitis. Int J Mol Sci 2018; 19:E2034. [PMID: 30011790 PMCID: PMC6073816 DOI: 10.3390/ijms19072034] [Citation(s) in RCA: 110] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 07/09/2018] [Accepted: 07/11/2018] [Indexed: 02/08/2023] Open
Abstract
NASH is becoming increasingly common worldwide because of the growing global prevalence of obesity and consequently NAFLD. Unfortunately, the mechanism of progression of NAFLD to NASH and then cirrhosis is not completely understood. Several factors, including insulin resistance, inflammation, oxidative stress, lipotoxicity, and bile acid (BA) toxicity, have been reported to be associated with NASH progression. The release of fatty acids from dysfunctional and insulin-resistant adipocytes results in lipotoxicity, which is caused by the ectopic accumulation of triglyceride-derived toxic metabolites and the subsequent activation of inflammatory pathways, cellular dysfunction, and lipoapoptosis. Adipose tissue (AT), especially visceral AT, comprises multiple cell populations that produce adipokines and insulin-like growth factor, plus macrophages and other immune cells that stimulate the development of lipotoxic liver disease. These biomolecules have been recently linked with many digestive diseases and gastrointestinal malignancies such as hepatocellular carcinoma. This made us question what role lipotoxicity has in the natural history of liver fibrosis. Therefore, this review focuses on the close relationship between AT and NASH. A good comprehension of the pathways that are related to dysregulated AT, metabolic dysfunction, and hepatic lipotoxicity will result in the development of prevention strategies and promising therapeutics for patients with NASH.
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Affiliation(s)
| | | | | | - Jessica P Hwang
- Department of General Internal Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
| | - Beatriz Barranco-Fragoso
- Department of Gastroenterology, National Medical Center "20 Noviembre", 03229 Mexico City, Mexico.
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Black MH, Shu YH, Wu J, Koebnick C, MacKay A, Watanabe RM, Buchanan TA, Xiang AH. Longitudinal Increases in Adiposity Contribute to Worsening Adipokine Profile over Time in Mexican Americans. Obesity (Silver Spring) 2018; 26:703-712. [PMID: 29427376 PMCID: PMC6021026 DOI: 10.1002/oby.22128] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 01/02/2018] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Limited studies have assessed the relationship between longitudinal changes in adiposity and changes in multiple adipokines over time. This study examined changes in BMI, total body fat, and trunk fat associated with changes in 16 circulating adipokines in Mexican Americans at risk for type 2 diabetes. METHODS Participants included 1,213 individuals with cross-sectional data and a subset of 368 individuals with follow-up measures (mean 4.6 ± 1.5 years from baseline). Joint multivariate associations between 3 adiposity measures and 16 adipokines were assessed by canonical correlation analysis. RESULTS Longitudinal increases in adiposity were most strongly associated with increasing leptin, C-reactive protein (CRP), and interleukin 1 receptor antagonist (IL-1Ra) and decreasing adiponectin and secreted frizzled protein 5 (SFRP5) over time. Participants with BMI ≥ 30 kg/m2 at baseline had greater increases in leptin, CRP, IL-1Ra, and interleukin 6 (IL-6) and greater decreases in adiponectin and SFRP5, associated with increasing adiposity over follow-up, than those with BMI < 30 kg/m2 . Associations between adiposity and adipokines were most accounted for by leptin; adjustment for leptin greatly reduced the magnitude of all associations between adiposity and remaining adipokines. CONCLUSIONS Increasing adiposity contributes to a worsening imbalance of pro- and anti-inflammatory adipokines over time, in which leptin may have an important role as a key mediator of metabolic disease risk in Mexican Americans.
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Affiliation(s)
- Mary Helen Black
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, CA
| | - Yu-Hsiang Shu
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, CA
| | - Jun Wu
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, CA
| | - Corinna Koebnick
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, CA
| | - Adrienne MacKay
- Department of Preventive Medicine, Keck School of Medicine of USC, Los Angeles, CA
| | - Richard M. Watanabe
- Department of Preventive Medicine, Keck School of Medicine of USC, Los Angeles, CA
- USC Diabetes and Obesity Research Institute, Los Angeles, CA
- Department of Physiology & Biophysics, Keck School of Medicine of USC, Los Angeles, CA
| | - Thomas A. Buchanan
- USC Diabetes and Obesity Research Institute, Los Angeles, CA
- Department of Physiology & Biophysics, Keck School of Medicine of USC, Los Angeles, CA
- Department of Medicine, Keck School of Medicine of USC, Los Angeles, CA
| | - Anny H. Xiang
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, CA
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35
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Vasan SK, Osmond C, Canoy D, Christodoulides C, Neville MJ, Di Gravio C, Fall CHD, Karpe F. Comparison of regional fat measurements by dual-energy X-ray absorptiometry and conventional anthropometry and their association with markers of diabetes and cardiovascular disease risk. Int J Obes (Lond) 2017; 42:850-857. [PMID: 29151596 PMCID: PMC5965665 DOI: 10.1038/ijo.2017.289] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 10/06/2017] [Accepted: 11/06/2017] [Indexed: 01/05/2023]
Abstract
Background/Objectives: Fat distribution is a strong and independent predictor of type 2 diabetes (T2D) and cardiovascular disease (CVD) and is usually determined using conventional anthropometry in epidemiological studies. Dual-energy X-ray absorptiometry (DXA) can measure total and regional adiposity more accurately. Nonetheless, whether DXA provides more precise estimates of cardiovascular risk in relation to total and regional adiposity is not known. We determined the strength of the associations between DXA- and conventional anthropometry determined fat distribution and T2D and CVD risk markers. Subjects/Methods: Waist (WC) and hip circumference (HC) and DXA was used to measure total and regional adiposity in 4950 (2119 men) participants aged 29–55 years from the Oxford Biobank without pre-existing T2D or CVD. Cross-sectional associations were compared between WC and HC vs. DXA-determined regional adiposity (all z-score normalised) with impaired fasting glucose, hypertriglyceridemia, hypertension and insulin resistance (IR). Results: Following adjustment for total adiposity, upper body adiposity measurements showed consistently increased risk of T2D and CVD risk markers except for abdominal subcutaneous fat in both sexes, and arm fat in men, which showed protective associations. Among upper adiposity depots, visceral fat mass showed stronger odds ratios (OR) ranging from 1.69 to 3.64 compared with WC 1.07–1.83. Among lower adiposity depots, HC showed modest protection for IR in both sexes (men: OR 0.80 (95% confidence interval 0.67, 0.96); women: 0.69 (0.56, 0.86)), whereas gynoid fat and in particular leg fat showed consistent and strong protective effects for all outcomes in both men and women. The differential effect of body fat distribution on CVD and T2D were more pronounced at higher levels of total adiposity. Conclusions: Compared with DXA, conventional anthropometry underestimates the associations of regional adiposity with T2D and CVD risk markers. After correcting for overall adiposity, greater subcutaneous fat mass in particular in the lower body is protective relative to greater android or visceral adipose tissue mass.
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Affiliation(s)
- S K Vasan
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford, UK
| | - C Osmond
- MRC Life-course Epidemiology Unit, University of Southampton, Southampton, UK
| | - D Canoy
- Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | - C Christodoulides
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford, UK
| | - M J Neville
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford, UK.,NIHR Oxford Biomedical Centre, Oxford University Hospital Trust and University of Oxford, Oxford, UK
| | - C Di Gravio
- MRC Life-course Epidemiology Unit, University of Southampton, Southampton, UK
| | - C H D Fall
- MRC Life-course Epidemiology Unit, University of Southampton, Southampton, UK
| | - F Karpe
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford, UK.,NIHR Oxford Biomedical Centre, Oxford University Hospital Trust and University of Oxford, Oxford, UK
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36
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Van Pelt DW, Guth LM, Wang AY, Horowitz JF. Factors regulating subcutaneous adipose tissue storage, fibrosis, and inflammation may underlie low fatty acid mobilization in insulin-sensitive obese adults. Am J Physiol Endocrinol Metab 2017; 313:E429-E439. [PMID: 28679624 PMCID: PMC5668599 DOI: 10.1152/ajpendo.00084.2017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 06/01/2017] [Accepted: 06/30/2017] [Indexed: 11/22/2022]
Abstract
Although the rate of fatty acid release from adipose tissue into the systemic circulation is very high in most obese adults, some obese adults maintain relatively low rates of fatty acid release, which helps protect them against the development of systemic insulin resistance. The primary aim of this study was to identify factors in adipose tissue that may underlie low vs. high rates of fatty acid mobilization in a relatively homogeneous cohort of obese adults. We measured systemic fatty acid rate of appearance (FA Ra) via 13C-palmitate isotope dilution, and we obtained subcutaneous abdominal adipose tissue samples from 30 obese adults (BMI: 38 ± 1 kg/m2, age: 30 ± 2 yr) after an overnight fast. We then measured insulin sensitivity using a hyperinsulinemic-euglycemic clamp. Confirming our previous work, insulin sensitivity was inversely proportional to FA Ra (R2 = 0.50; P < 0.001). Immunoblot analysis of subcutaneous adipose tissue samples revealed that, compared with obese adults with high FA Ra, those with low FA Ra had lower markers of lipase activation and higher abundance of glycerol-3-phosphate acyltransferase, which is a primary enzyme for fatty acid esterification. Microarray and pathway analysis provided evidence of lower fibrosis and lower SAPK/JNK pathway activation in obese adults with low FA Ra compared with those with high FA Ra. Our findings suggest that alterations in factors regulating triglyceride storage in adipose tissue, along with lower fibrosis and inflammatory pathway activation, may underlie maintenance of a relatively low FA Ra in obesity, which may help protect against the development of insulin resistance.
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Affiliation(s)
- Douglas W Van Pelt
- Substrate Metabolism Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, Michigan
| | - Lisa M Guth
- Substrate Metabolism Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, Michigan
| | - Abigail Y Wang
- Substrate Metabolism Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, Michigan
| | - Jeffrey F Horowitz
- Substrate Metabolism Laboratory, School of Kinesiology, University of Michigan, Ann Arbor, Michigan
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Schiffer L, Kempegowda P, Arlt W, O’Reilly MW. MECHANISMS IN ENDOCRINOLOGY: The sexually dimorphic role of androgens in human metabolic disease. Eur J Endocrinol 2017; 177:R125-R143. [PMID: 28566439 PMCID: PMC5510573 DOI: 10.1530/eje-17-0124] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/12/2017] [Accepted: 05/03/2017] [Indexed: 12/22/2022]
Abstract
Female androgen excess and male androgen deficiency manifest with an overlapping adverse metabolic phenotype, including abdominal obesity, insulin resistance, type 2 diabetes mellitus, non-alcoholic fatty liver disease and an increased risk of cardiovascular disease. Here, we review the impact of androgens on metabolic target tissues in an attempt to unravel the complex mechanistic links with metabolic dysfunction; we also evaluate clinical studies examining the associations between metabolic disease and disorders of androgen metabolism in men and women. We conceptualise that an equilibrium between androgen effects on adipose tissue and skeletal muscle underpins the metabolic phenotype observed in female androgen excess and male androgen deficiency. Androgens induce adipose tissue dysfunction, with effects on lipid metabolism, insulin resistance and fat mass expansion, while anabolic effects on skeletal muscle may confer metabolic benefits. We hypothesise that serum androgen concentrations observed in female androgen excess and male hypogonadism are metabolically disadvantageous, promoting adipose and liver lipid accumulation, central fat mass expansion and insulin resistance.
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Affiliation(s)
- Lina Schiffer
- Institute of Metabolism and Systems ResearchUniversity of Birmingham, Edgbaston, Birmingham, UK
| | - Punith Kempegowda
- Institute of Metabolism and Systems ResearchUniversity of Birmingham, Edgbaston, Birmingham, UK
| | - Wiebke Arlt
- Institute of Metabolism and Systems ResearchUniversity of Birmingham, Edgbaston, Birmingham, UK
- Centre for EndocrinologyDiabetes and Metabolism, Birmingham Health Partners, University Hospitals Birmingham NHS Foundation Trust, Edgbaston, Birmingham, UK
| | - Michael W O’Reilly
- Institute of Metabolism and Systems ResearchUniversity of Birmingham, Edgbaston, Birmingham, UK
- Centre for EndocrinologyDiabetes and Metabolism, Birmingham Health Partners, University Hospitals Birmingham NHS Foundation Trust, Edgbaston, Birmingham, UK
- Correspondence should be addressed to M W O’Reilly;
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38
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Osorio-Conles O, Guitart M, Moreno-Navarrete JM, Escoté X, Duran X, Fernandez-Real JM, Gomez-Foix AM, Fernández-Veledo S, Vendrell J. Adipose tissue and serum CCDC80 in obesity and its association with related metabolic disease. Mol Med 2017; 23:225-234. [PMID: 28850155 DOI: 10.2119/molmed.2017.00067] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Accepted: 08/15/2017] [Indexed: 01/21/2023] Open
Abstract
Coiled-coil domain-containing 80 (CCDC80) is an adipocyte-secreted protein that modulates glucose homeostasis in response to diet-induced obesity in mice. The objective of this study is to analyze the link between human CCDC80 and obesity. CCDC80 protein expression was assessed in paired visceral (VAT) and subcutaneous (SAT) adipose tissue from 10 subjects (BMI range 22.4-38.8 kg/m2). Circulating CCDC80 levels were quantified in serum samples from two independent cross-sectional cohorts comprising 33 lean and 15 obese (cohort 1) and 32 morbid obese (cohort 2) male subjects. Insulin sensitivity, insulin secretion and blood neutrophil count were quantified in serum samples from both cohorts. Additionally, circulating free IGF-1 levels and oral glucose tolerance tests (OGTT) were assessed in cohort 1 whereas C-reactive protein levels and degree of atherosclerosis and hepatic steatosis were studied in cohort 2. In lean subjects, total CCDC80 protein content assessed by immunoblotting was lower in VAT than in SAT. In obese patients, CCDC80 was increased in VAT (P<0.05), but equivalent in SAT compared with lean counterparts. In cohort 1, serum CCDC80 correlated negatively with the acute insulin response to glucose and IGF1 levels, and positively with blood neutrophil count, independently of BMI, but not with insulin sensitivity. In cohort 2, serum CCDC80 was positively linked to the inflammatory biomarker C-reactive protein (r=0.46; P=0.009), atherosclerosis (carotid intima-media thickness, r=0.62; P<0.001) and hepatic steatosis (ANOVA P=0.025). Overall, these results suggest for the first time that CCDC80 may be a component of the obesity-altered secretome in VAT and could act as an adipokine whose circulant levels are linked to glucose tolerance derangements and related to inflammation-associated chronic complications.
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Affiliation(s)
- O Osorio-Conles
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM)-Instituto de Salud Carlos III, Spain.,Departament de Bioquímica i Biologia Molecular, Institut de Biomedicina de la Universitat de Barcelona, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
| | - M Guitart
- Departament de Bioquímica i Biologia Molecular, Institut de Biomedicina de la Universitat de Barcelona, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
| | - J M Moreno-Navarrete
- Service of Diabetes, Endocrinology and Nutrition, Institut d'Investigacio Biomedica de Girona and CIBERobn, Girona, Spain
| | - X Escoté
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM)-Instituto de Salud Carlos III, Spain.,Joan XXIII University Hospital, Rovira i Virgili University IISPV, Tarragona, Spain
| | - X Duran
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM)-Instituto de Salud Carlos III, Spain.,Joan XXIII University Hospital, Rovira i Virgili University IISPV, Tarragona, Spain
| | - J M Fernandez-Real
- Service of Diabetes, Endocrinology and Nutrition, Institut d'Investigacio Biomedica de Girona and CIBERobn, Girona, Spain
| | - A M Gomez-Foix
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM)-Instituto de Salud Carlos III, Spain.,Departament de Bioquímica i Biologia Molecular, Institut de Biomedicina de la Universitat de Barcelona, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
| | - S Fernández-Veledo
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM)-Instituto de Salud Carlos III, Spain.,Joan XXIII University Hospital, Rovira i Virgili University IISPV, Tarragona, Spain
| | - J Vendrell
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM)-Instituto de Salud Carlos III, Spain.,Joan XXIII University Hospital, Rovira i Virgili University IISPV, Tarragona, Spain
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Brandão BB, Guerra BA, Mori MA. Shortcuts to a functional adipose tissue: The role of small non-coding RNAs. Redox Biol 2017; 12:82-102. [PMID: 28214707 PMCID: PMC5312655 DOI: 10.1016/j.redox.2017.01.020] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 01/30/2017] [Indexed: 12/20/2022] Open
Abstract
Metabolic diseases such as type 2 diabetes are a major public health issue worldwide. These diseases are often linked to a dysfunctional adipose tissue. Fat is a large, heterogenic, pleiotropic and rather complex tissue. It is found in virtually all cavities of the human body, shows unique plasticity among tissues, and harbors many cell types in addition to its main functional unit - the adipocyte. Adipose tissue function varies depending on the localization of the fat depot, the cell composition of the tissue and the energy status of the organism. While the white adipose tissue (WAT) serves as the main site for triglyceride storage and acts as an important endocrine organ, the brown adipose tissue (BAT) is responsible for thermogenesis. Beige adipocytes can also appear in WAT depots to sustain heat production upon certain conditions, and it is becoming clear that adipose tissue depots can switch phenotypes depending on cell autonomous and non-autonomous stimuli. To maintain such degree of plasticity and respond adequately to changes in the energy balance, three basic processes need to be properly functioning in the adipose tissue: i) adipogenesis and adipocyte turnover, ii) metabolism, and iii) signaling. Here we review the fundamental role of small non-coding RNAs (sncRNAs) in these processes, with focus on microRNAs, and demonstrate their importance in adipose tissue function and whole body metabolic control in mammals.
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Affiliation(s)
- Bruna B Brandão
- Program in Molecular Biology, Universidade Federal de São Paulo, São Paulo, Brazil; Department of Biochemistry and Tissue Biology, Universidade Estadual de Campinas, Campinas, Brazil
| | - Beatriz A Guerra
- Program in Molecular Biology, Universidade Federal de São Paulo, São Paulo, Brazil; Department of Biochemistry and Tissue Biology, Universidade Estadual de Campinas, Campinas, Brazil
| | - Marcelo A Mori
- Program in Molecular Biology, Universidade Federal de São Paulo, São Paulo, Brazil; Department of Biochemistry and Tissue Biology, Universidade Estadual de Campinas, Campinas, Brazil; Program in Genetics and Molecular Biology, Universidade Estadual de Campinas, Campinas, Brazil.
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40
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Jankovic A, Korac A, Buzadzic B, Stancic A, Otasevic V, Ferdinandy P, Daiber A, Korac B. Targeting the NO/superoxide ratio in adipose tissue: relevance to obesity and diabetes management. Br J Pharmacol 2017; 174:1570-1590. [PMID: 27079449 PMCID: PMC5446578 DOI: 10.1111/bph.13498] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 03/31/2016] [Accepted: 04/04/2016] [Indexed: 12/21/2022] Open
Abstract
Insulin sensitivity and metabolic homeostasis depend on the capacity of adipose tissue to take up and utilize excess glucose and fatty acids. The key aspects that determine the fuel-buffering capacity of adipose tissue depend on the physiological levels of the small redox molecule, nitric oxide (NO). In addition to impairment of NO synthesis, excessive formation of the superoxide anion (О2•- ) in adipose tissue may be an important interfering factor diverting the signalling of NO and other reactive oxygen and nitrogen species in obesity, resulting in metabolic dysfunction of adipose tissue over time. Besides its role in relief from superoxide burst, enhanced NO signalling may be responsible for the therapeutic benefits of different superoxide dismutase mimetics, in obesity and experimental diabetes models. This review summarizes the role of NO in adipose tissue and highlights the effects of NO/О2•- ratio 'teetering' as a promising pharmacological target in the metabolic syndrome. LINKED ARTICLES This article is part of a themed section on Redox Biology and Oxidative Stress in Health and Disease. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.12/issuetoc.
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Affiliation(s)
- Aleksandra Jankovic
- Department of Physiology, Institute for Biological Research “Sinisa Stankovic”University of BelgradeBelgradeSerbia
| | - Aleksandra Korac
- Faculty of Biology, Center for Electron MicroscopyUniversity of BelgradeBelgradeSerbia
| | - Biljana Buzadzic
- Department of Physiology, Institute for Biological Research “Sinisa Stankovic”University of BelgradeBelgradeSerbia
| | - Ana Stancic
- Department of Physiology, Institute for Biological Research “Sinisa Stankovic”University of BelgradeBelgradeSerbia
| | - Vesna Otasevic
- Department of Physiology, Institute for Biological Research “Sinisa Stankovic”University of BelgradeBelgradeSerbia
| | - Péter Ferdinandy
- Department of Pharmacology and PharmacotherapySemmelweis UniversityBudapestHungary
- Pharmahungary GroupSzegedHungary
| | - Andreas Daiber
- Center for Cardiology ‐ Cardiology 1, Molecular CardiologyUniversity Medical CenterMainzGermany
| | - Bato Korac
- Department of Physiology, Institute for Biological Research “Sinisa Stankovic”University of BelgradeBelgradeSerbia
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What have human experimental overfeeding studies taught us about adipose tissue expansion and susceptibility to obesity and metabolic complications? Int J Obes (Lond) 2017; 41:853-865. [PMID: 28077863 DOI: 10.1038/ijo.2017.4] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 12/08/2016] [Accepted: 12/18/2016] [Indexed: 02/07/2023]
Abstract
Overfeeding experiments, in which we impose short-term positive energy balance, help unravel the cellular, physiological and behavioural adaptations to nutrient excess. These studies mimic longer-term mismatched energy expenditure and intake. There is considerable inter-individual heterogeneity in the magnitude of weight gain when exposed to similar relative caloric excess reflecting variable activation of compensatory adaptive mechanisms. Significantly, given similar relative weight gain, individuals may be protected from/predisposed to metabolic complications (insulin resistance, dyslipidaemia, hypertension), non-alcoholic fatty liver disease and cardiovascular disease. Similar mechanistic considerations underpinning the heterogeneity of overfeeding responses are pertinent in understanding emerging metabolic phenotypes, for example, metabolically unhealthy normal weight and metabolically healthy obesity. Intrinsic and extrinsic factors modulate individuals' overfeeding response: intrinsic factors include gender/hormonal status, genetic/ethnic background, baseline metabolic health and cardiorespiratory fitness; extrinsic factors include macronutrient (fat vs carbohydrate) content, fat/carbohydrate composition and overfeeding pattern. Subcutaneous adipose tissue (SAT) analysis, coupled with metabolic assessment, with overfeeding have revealed how SAT remodels to accommodate excess nutrients. SAT remodelling occurs either by hyperplasia (increased adipocyte number) or by hypertrophy (increased adipocyte size). Biological responses of SAT also govern the extent of ectopic (visceral/liver) triglyceride deposition. Body composition analysis by DEXA/MRI (dual energy X-ray absorptiometry/magnetic resonance imaging) have determined the relative expansion of SAT (including abdominal/gluteofemoral SAT) vs ectopic fat with overfeeding. Such studies have contributed to the adipose expandability hypothesis whereby SAT has a finite capacity to expand (governed by intrinsic biological characteristics), and once capacity is exceeded ectopic triglyceride deposition occurs. The potential for SAT expandability confers protection from/predisposes to the adverse metabolic responses to overfeeding. The concept of a personal fat threshold suggests a large inter-individual variation in SAT capacity with ectopic depot expansion/metabolic decompensation once one's own threshold is exceeded. This review summarises insight gained from overfeeding studies regarding susceptibility to obesity and related complications with nutrient excess.
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Wu Y, Lee MJ, Ido Y, Fried SK. High-fat diet-induced obesity regulates MMP3 to modulate depot- and sex-dependent adipose expansion in C57BL/6J mice. Am J Physiol Endocrinol Metab 2017; 312:E58-E71. [PMID: 27879248 PMCID: PMC5283879 DOI: 10.1152/ajpendo.00128.2016] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 10/26/2016] [Accepted: 11/08/2016] [Indexed: 12/20/2022]
Abstract
Increased adipocyte size is hypothesized to signal the recruitment of adipose progenitor cells (APCs) to expand tissue storage capacity. To investigate depot and sex differences in adipose growth, male and female C57BL/6J mice (10 wk-old) were challenged with high-fat (HF) or low-fat (LF) diets (D) for 14 wk. The HFD increased gonadal (GON) depot weight by adipocyte hypertrophy and hyperplasia in females but hypertrophy alone in males. In both sexes, inguinal (ING) adipocytes were smaller than GON, and depot expansion was due to hypertrophy. Matrix metalloproteinase 3 (Mmp3), an antiadipogenic factor, and its inhibitor Timps modulate the extracellular matrix remodeling needed for depot expansion. Mmp3 mRNA was depot different (ING > GON), higher in females than males and mainly expressed in APCs. In males, HFD-induced obesity increased tissue and APC Mmp3 mRNA levels and MMP3 protein and enzymatic activity. In females however, HFD significantly decreased MMP3 protein without affecting its mRNA levels. MMP3 activity also decreased (significant in ING). Timp4 mRNA was expressed mainly in adipocytes, and HFD-induced obesity tended to increase the ratio of TIMP4 to MMP3 protein in females, whereas it decreased it in males. Overexpression of Mmp3 in 3T3-L1 preadipocytes or rhMMP3 protein added to primary human preadipocytes inhibited differentiation, whereas rhTIMP4 improved adipogenesis and attenuated the inhibitory effect of rhMMP3. These data suggest that HFD-induced obesity downregulates APC MMP3 expression to trigger adipogenesis, and adipocyte TIMP4 may modulate this process to regulate hyperplastic vs. hypertrophic adipose tissue expansion, fat distribution, and metabolic health in a sex- and depot-dependent manner.
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Affiliation(s)
- Yuanyuan Wu
- Obesity Center, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
| | - Mi-Jeong Lee
- Obesity Center, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
| | - Yasuo Ido
- Obesity Center, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
| | - Susan K Fried
- Obesity Center, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
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Liang X, Yang Q, Fu X, Rogers CJ, Wang B, Pan H, Zhu MJ, Nathanielsz PW, Du M. Maternal obesity epigenetically alters visceral fat progenitor cell properties in male offspring mice. J Physiol 2016; 594:4453-66. [PMID: 27060371 DOI: 10.1113/jp272123] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 03/29/2016] [Indexed: 02/01/2023] Open
Abstract
KEY POINTS Maternal obesity reduces adipogenic progenitor density in offspring adipose tissue. The ability of adipose tissue expansion in the offspring of obese mothers is limited and is associated with metabolic dysfunction of adipose tissue when challenged with a high-fat diet. Maternal obesity induces DNA demethylation in the promoter of zinc finger protein 423, which renders progenitor cells with a high adipogenic capacity. Maternal obesity demonstrates long-term effects on the adipogenic capacity of progenitor cells in offspring adipose tissue, demonstrating a developmental programming effect. ABSTRACT Maternal obesity (MO) programs offspring obesity and metabolic disorders, although the underlying mechanisms remain poorly defined. Progenitor cells are the source of new adipocytes. The present study aimed to test whether MO epigenetically predisposes adipocyte progenitors in the fat of offspring to adipogenic differentiation and subsequent depletion, which leads to a failure of adipose tissue plasticity under positive energy balance, contributing to adipose tissue metabolic dysfunction. C57BL/6 female mice were fed either a control diet (10% energy from fat) or a high-fat diet (45% energy from fat) for 8 weeks before mating. Male offspring of control (Con) and obese (OB) dams were weaned onto a regular (Reg) or obesogenic (Obe) diet until 3 months of age. At weaning, male OB offspring had a higher expression of Zinc finger protein 423 (zfp423), a key transcription factor in adipogenesis, as well as lower DNA methylation of its promoter in progenitors of epididymal fat compared to Con offspring, which was correlated with enhanced adipogenic differentiation. At 3 months of age, progenitor density was 30.9 ± 9.7% lower in OB/Obe compared to Con/Obe mice, accompanied by a limited expansion of the adipocyte number when challenged with a high-energy diet. This difference was associated with lower DNA methylation in the zfp423 promoter in the epididymal fat of OB/Obe offspring, which was correlated with greater macrophage chemotactic protein-1 and hypoxia-inducible factor 1α expression. In summary, MO epigenetically limits the expansion capacity of offspring adipose tissue, providing an explanation for the adipose metabolic dysfunction of male offspring in the setting of MO.
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Affiliation(s)
- Xingwei Liang
- Washington Centre for Muscle Biology and Department of Animal Sciences, Washington State University, Pullman, WA, USA
| | - Qiyuan Yang
- Washington Centre for Muscle Biology and Department of Animal Sciences, Washington State University, Pullman, WA, USA
| | - Xing Fu
- Washington Centre for Muscle Biology and Department of Animal Sciences, Washington State University, Pullman, WA, USA
| | - Carl J Rogers
- Washington Centre for Muscle Biology and Department of Animal Sciences, Washington State University, Pullman, WA, USA
| | - Bo Wang
- Washington Centre for Muscle Biology and Department of Animal Sciences, Washington State University, Pullman, WA, USA
| | - Hong Pan
- Washington Centre for Muscle Biology and Department of Animal Sciences, Washington State University, Pullman, WA, USA
| | - Mei-Jun Zhu
- School of Food Sciences, Washington State University, Pullman, WA, USA
| | - Peter W Nathanielsz
- Wyoming Pregnancy and Life Course Health Centre, Department of Animal Science, University of Wyoming, Laramie, Wyoming, USA
| | - Min Du
- Washington Centre for Muscle Biology and Department of Animal Sciences, Washington State University, Pullman, WA, USA.,Beijing Advanced Innovation Centre for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing, China
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Vasconcelos LHC, Souza ILL, Pinheiro LS, Silva BA. Ion Channels in Obesity: Pathophysiology and Potential Therapeutic Targets. Front Pharmacol 2016; 7:58. [PMID: 27065858 PMCID: PMC4811910 DOI: 10.3389/fphar.2016.00058] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 02/29/2016] [Indexed: 01/29/2023] Open
Abstract
Obesity is a multifactorial disease related to metabolic disorders and associated with genetic determinants. Currently, ion channels activity has been linked to many of these disorders, in addition to the central regulation of food intake, energetic balance, hormone release and response, as well as the adipocyte cell proliferation. Therefore, the objective of this work is to review the current knowledge about the influence of ion channels in obesity development. This review used different sources of literature (Google Scholar, PubMed, Scopus, and Web of Science) to assess the role of ion channels in the pathophysiology of obesity. Ion channels present diverse key functions, such as the maintenance of physiological homeostasis and cell proliferation. Cell biology and pharmacological experimental evidences demonstrate that proliferating cells exhibit ion channel expression, conductance, and electrical properties different from the resting cells. Thereby, a large variety of ion channels has been identified in the pathogenesis of obesity such as potassium, sodium, calcium and chloride channels, nicotinic acetylcholine receptor and transient receptor potential channels. The fundamental involvement of these channels on the generation of obesity leads to the progress in the knowledge about the mechanisms responsible for the obesity pathophysiology, consequently emerging as new targets for pharmacological modulation.
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Affiliation(s)
- Luiz H C Vasconcelos
- Laboratório de Farmacologia Funcional Prof. George Thomas, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Iara L L Souza
- Laboratório de Farmacologia Funcional Prof. George Thomas, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Lílian S Pinheiro
- Laboratório de Farmacologia Funcional Prof. George Thomas, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Bagnólia A Silva
- Laboratório de Farmacologia Funcional Prof. George Thomas, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, Universidade Federal da ParaíbaJoão Pessoa, Brazil; Departamento de Ciências Farmacêuticas, Centro de Ciências da Saúde, Universidade Federal da ParaíbaJoão Pessoa, Brazil
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miR-155 Deletion in Female Mice Prevents Diet-Induced Obesity. Sci Rep 2016; 6:22862. [PMID: 26953132 PMCID: PMC4782173 DOI: 10.1038/srep22862] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 02/22/2016] [Indexed: 12/28/2022] Open
Abstract
Obesity is a growing epidemic in developed countries. Obese individuals are susceptible to comorbidities, including cardiovascular disease and metabolic disorder. Increasing the ability of adipose tissue to expend excess energy could improve protection from obesity. One promising target is microRNA (miR)-155-5p. We demonstrate that deletion of miR-155 (-5p and -3p) in female mice prevents diet-induced obesity. Body weight gain did not differ between wild-type (WT) and miR-155 knockout (KO) mice fed control diet (CD); however, miR-155 KO mice fed high-fat diet (HFD) gained 56% less body weight and 74% less gonadal white adipose tissue (WAT) than WT mice. Enhanced WAT thermogenic potential, brown adipose tissue differentiation, and/or insulin sensitivity might underlie this obesity resistance. Indeed, miR-155 KO mice on HFD had 21% higher heat release than WT HFD mice. Compared to WT adipocytes, miR-155 KO adipocytes upregulated brown (Ucp1, Cidea, Pparg) and white (Fabp4, Pnpla2, AdipoQ, Fasn) adipogenic genes, and glucose metabolism genes (Glut4, Irs1). miR-155 deletion abrogated HFD-induced adipocyte hypertrophy and WAT inflammation. Therefore, miR-155 deletion increases adipogenic, insulin sensitivity, and energy uncoupling machinery, while limiting inflammation in WAT, which together could restrict HFD-induced fat accumulation. Our results identify miR-155 as a novel candidate target for improving obesity resistance.
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Ferrer-Lorente R, Bejar MT, Badimon L. Notch signaling pathway activation in normal and hyperglycemic rats differs in the stem cells of visceral and subcutaneous adipose tissue. Stem Cells Dev 2015; 23:3034-48. [PMID: 25035907 DOI: 10.1089/scd.2014.0070] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The precise mechanisms underlying the differential function and cardiometabolic risk of white adipose tissue (WAT) remain unclear. Visceral adipose tissue (VWAT) and subcutaneous adipose tissue (SCWAT) have different metabolic functions that seem to be ascribed to their different intrinsic expansion capacities. Here we have hypothesized that the WAT characteristics are determined by the resident adipose-derived stem cells (ASCs) found in the different WAT depots. Therefore, our objective has been to investigate adipogenesis in anatomically distinct fat depots. ASCs from five different WAT depots were characterized in both healthy lean and diabetic obese rats, showing significant differences in expression of some of genes governing the stemness and the earlier adipogenic differentiation steps. Notch-target genes [Hes (hairy and enhancer of split) and Hey (hairy/enhancer of split related with YRPW motif) families] were upregulated in ASCs derived from visceral depots. Upon adipogenic differentiation, adipocyte cell markers were downregulated in ASCs from VWAT in comparison to ASCs from SCWAT, revealing a lower adipogenic capacity in ASCs of visceral origin than in those of SCWAT in accordance with the differential activation of Notch signaling. Notch upregulation by its activator phenethyl isothiocyanate attenuated the adipogenic differentiation of ASCs from SCWAT whereas Notch inhibition by N-[N-(3,5-difluorophenacetyl-L-alanyl)]-S-phenylglycine t-butyl ester (DAPT) increased the adipogenic differentiation of ASCs from visceral origin. In conclusion, the differential activation of Notch in ASCs is the origin of the different intrinsic WAT expansion capacities that contribute to the regional variations in WAT homeostasis and to its associated cardiometabolic risk.
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Affiliation(s)
- Raquel Ferrer-Lorente
- 1 Cardiovascular Research Center, CSIC-ICCC , Hospital de la Santa Creu i Sant Pau (UAB), Barcelona, Spain
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Matsuo Y, Tanaka M, Yamakage H, Sasaki Y, Muranaka K, Hata H, Ikai I, Shimatsu A, Inoue M, Chun TH, Satoh-Asahara N. Thrombospondin 1 as a novel biological marker of obesity and metabolic syndrome. Metabolism 2015; 64:1490-9. [PMID: 26298466 PMCID: PMC4936918 DOI: 10.1016/j.metabol.2015.07.016] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 06/20/2015] [Accepted: 07/20/2015] [Indexed: 11/23/2022]
Abstract
CONTEXT Thrombospondin 1 (THBS1 or TSP-1) is an adipose-derived matricellular protein, which has recently been highlighted as a potential mediator of insulin resistance and adipose inflammation in obesity. OBJECTIVE In this study, we aimed to determine the clinical significance of THBS1 as a novel biological marker of visceral obesity, metabolic syndrome, and diabetes. METHODS The THBS1 mRNA level was quantified with real-time PCR in human adipose tissues obtained from 16 non-obese subjects. The relationships between serum THBS1 level and obesity/diabetes traits as well as the diagnostic components of metabolic syndrome were assessed in 164 normal-weight or overweight/obese subjects (78 males and 86 females; mean age, 50.4; mean BMI, 29.8) with analysis of covariance (ANCOVA) and regression analyses. RESULTS THBS1 was predominantly expressed in visceral adipose tissues relative to subcutaneous adipose tissues (P<0.001). The visceral THBS1 expression was positively associated with the body mass index (BMI; γs=0.54, P=0.033). ANCOVA demonstrated that the THBS1 level is associated with abdominal obesity (P<0.001), hyperglycemia (P=0.02), and hypertension (P=0.04). Multivariable regression analysis suggested an association between serum THBS1 and fasting plasma glucose levels. The associations between serum THBS1 levels and obesity/diabetes traits were found preferentially in women (BMI, γs=0.30, P=0.05; FPG, γs=0.26, P=0.016). Subanalyses demonstrated that the association with obesity traits was predominantly found in premenopausal women (BMI, γs=0.41, P=0.007), whereas the association with diabetes traits was predominant in postmenopausal women (HbA1c, γs=0.38, P=0.01). During medical weight reduction treatment, the change in the serum THBS1 level was associated with the change in BMI and HbA1c in pre- and postmenopausal women, respectively. CONCLUSIONS Serum THBS1 is a useful biological marker of obesity and metabolic syndrome in Japanese subjects, particularly in women. THBS1 may act as a critical circulating factor that couples obesity with metabolic syndrome and diabetes in humans.
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Affiliation(s)
- Yoshiyuki Matsuo
- Division of Diabetic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan
| | - Masashi Tanaka
- Division of Diabetic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan
| | - Hajime Yamakage
- Division of Diabetic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan
| | - Yousuke Sasaki
- Division of Diabetic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan
| | - Kazuya Muranaka
- Division of Diabetic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan
| | - Hiroaki Hata
- Department of Surgery, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan
| | - Iwao Ikai
- Department of Surgery, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan
| | - Akira Shimatsu
- Division of Diabetic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan
| | - Mayumi Inoue
- Division of Metabolism, Endocrinology & Diabetes (MEND), Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Tae-Hwa Chun
- Division of Metabolism, Endocrinology & Diabetes (MEND), Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, 48109, USA; Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109, USA.
| | - Noriko Satoh-Asahara
- Division of Diabetic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa Mukaihata-cho, Fushimi-ku, Kyoto, 612-8555, Japan.
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Oliveira MD, de Síbio MT, Olimpio RMC, Moretto FCF, Luvizotto RDAM, Nogueira CR. Triiodothyronine modulates the expression of leptin and adiponectin in 3T3-L1 adipocytes. EINSTEIN-SAO PAULO 2015; 13:72-8. [PMID: 25993072 PMCID: PMC4946815 DOI: 10.1590/s1679-45082015ao3068] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Accepted: 01/12/2015] [Indexed: 01/12/2023] Open
Abstract
Objective To study the effect of different doses of triiodothyronine on gene expression of the adipokines leptin and adiponectin, at different times, and to evaluate the difference in expression between the two adipokines in each group. Methods 3T3-L1 adipocytes were incubated with triiodothyronine at physiological dose (10nM) and supraphysiological doses (100nM or 1,000nM), or without triiodothyronine (control, C) for 0.5, 6, or 24 hours. Leptin and adiponectin mRNA was detected using real-time polymerase chain reaction (RT-PCR). One-way analyses of variance, Tukey’s test or Student’s t test, were used to analyze data, and significance level was set at 5%. Results Leptin levels decreased in the 1,000nM-dose group after 0.5 hour. Adiponectin levels dropped in the 10nM-dose group, but increased at the 100nM dose. After 6 hours, both genes were suppressed in all hormone concentrations. After 24 hours, leptin levels increased at 10, 100 and 1,000nM groups as compared to the control group; and adiponectin levels increased only in the 100nM group as compared to the control group. Conclusion These results demonstrated fast actions of triiodothyronine on the leptin and adiponectin expression, starting at 0.5 hour, at a dose of 1,000nM for leptin and 100nM for adiponectin. Triiodothyronine stimulated or inhibited the expression of adipokines in adipocytes at different times and doses which may be useful to assist in the treatment of obesity, assuming that leptin is increased and adiponectin is decreased, in obesity cases.
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Affiliation(s)
- Miriane de Oliveira
- Universidade Estadual Paulista "Júlio de Mesquita Filho", Botucatu, SP, Brazil
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Rojas-Rodriguez R, Lifshitz LM, Bellve KD, Min SY, Pires J, Leung K, Boeras C, Sert A, Draper JT, Corvera S, Moore Simas TA. Human adipose tissue expansion in pregnancy is impaired in gestational diabetes mellitus. Diabetologia 2015; 58:2106-14. [PMID: 26067361 PMCID: PMC4526585 DOI: 10.1007/s00125-015-3662-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Accepted: 05/19/2015] [Indexed: 12/26/2022]
Abstract
AIMS/HYPOTHESIS During pregnancy, adipose tissue (AT) must expand to support the growing fetus and the future nutritional needs of the offspring. Limited expandability of AT is associated with insulin resistance, attributed to ectopic lipid deposition. This study aimed to investigate human AT expandability during pregnancy and its role in the pathogenesis of gestational diabetes mellitus (GDM). METHODS This cross-sectional study of omental (OM) and subcutaneous (SQ) AT collected at Caesarean delivery included 11 pregnant and three non-pregnant women with normal glucose tolerance (NGT), five with GDM, three with type 2 diabetes mellitus. Adipocyte size, capillary density, collagen content and capillary growth were measured. Affymetrix arrays and real-time PCR studies of gene expression were performed. RESULTS Mean OM adipocyte size was greater in women with GDM than in those with NGT (p = 0.004). Mean OM and SQ capillary density was lower in GDM compared with NGT (p = 0.015). Capillary growth did not differ significantly between groups. The most differentially expressed AT transcript when comparing non-pregnant and pregnant women corresponded to the IGF binding protein (IGFBP)-5, the expression levels of which was found by subsequent quantitative real-time PCR to be lower in women with GDM vs women with NGT (p < 0.0001). CONCLUSIONS/INTERPRETATION The relative OM adipocyte hypertrophy and decreased OM and SQ capillary density are consistent with impaired AT expandability in GDM. The induction of adipose tissue IGFBP5 in pregnancy and its decrease in GDM point to the importance of the IGF-1 signalling pathway in AT expansion in pregnancy and GDM susceptibility.
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Affiliation(s)
- Raziel Rojas-Rodriguez
- Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Worcester, MA 01605 USA
- Graduate School of Biomedical Sciences, University of Massachusetts Medical School, Worcester, MA USA
| | - Lawrence M. Lifshitz
- Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Worcester, MA 01605 USA
- Biomedical Imaging Group, University of Massachusetts Medical School, Worcester, MA USA
| | - Karl D. Bellve
- Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Worcester, MA 01605 USA
- Biomedical Imaging Group, University of Massachusetts Medical School, Worcester, MA USA
| | - So Yun Min
- Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Worcester, MA 01605 USA
- Graduate School of Biomedical Sciences, University of Massachusetts Medical School, Worcester, MA USA
| | - Jacqueline Pires
- School of Medicine, University of Massachusetts Medical School, Worcester, MA USA
- Clinical Translational Research Pathway, University of Massachusetts Medical School, Worcester, MA USA
| | - Katherine Leung
- Department of Obstetrics & Gynecology, Division of Research, University of Massachusetts Medical School/UMass Memorial Health Care, Memorial Campus - 119 Belmont Street, Worcester, MA 01605 USA
| | - Crina Boeras
- Department of Obstetrics & Gynecology, Division of Research, University of Massachusetts Medical School/UMass Memorial Health Care, Memorial Campus - 119 Belmont Street, Worcester, MA 01605 USA
| | - Aylin Sert
- School of Medicine, University of Massachusetts Medical School, Worcester, MA USA
- Department of Obstetrics & Gynecology, Division of Research, University of Massachusetts Medical School/UMass Memorial Health Care, Memorial Campus - 119 Belmont Street, Worcester, MA 01605 USA
| | - Jacqueline T. Draper
- School of Medicine, University of Massachusetts Medical School, Worcester, MA USA
| | - Silvia Corvera
- Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Worcester, MA 01605 USA
| | - Tiffany A. Moore Simas
- Department of Obstetrics & Gynecology, Division of Research, University of Massachusetts Medical School/UMass Memorial Health Care, Memorial Campus - 119 Belmont Street, Worcester, MA 01605 USA
- Department of Pediatrics, University of Massachusetts Medical School/UMass Memorial Health Care, Worcester, MA USA
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Yeoh AJ, Pedley A, Rosenquist KJ, Hoffmann U, Fox CS. The Association Between Subcutaneous Fat Density and the Propensity to Store Fat Viscerally. J Clin Endocrinol Metab 2015; 100:E1056-64. [PMID: 26062015 PMCID: PMC4525002 DOI: 10.1210/jc.2014-4032] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Alterations in the cellular characteristics of subcutaneous adipose tissue (SAT) may reduce its ability to expand in times of caloric excess, increasing the propensity to store excess calories viscerally (visceral adipose tissue [VAT]). We hypothesized (1) that increased SAT density, an indirect marker of fat quality, would be associated with an increased VAT/SAT ratio and increased cardiovascular disease (CVD) risk and (2) that these associations would be independent of the absolute volume of SAT. METHODS We investigated the association of SAT density with the VAT/SAT ratio and CVD risk in 3212 participants (48% women, mean age, 50.7 years) from the Framingham Heart Study. Adipose tissue depot density and volume were quantified by computed tomography; traditional CVD risk factors were quantified. RESULTS Higher SAT density was correlated with a higher VAT/SAT ratio in men (r = 0.17; P < .0001) but not in women (r = 0.04; P ≥ .05). More adverse levels of CVD risk factors were observed in the high SAT density/high VAT/SAT ratio group than in the referent group (low density/low ratio). For example, women had an increased risk of diabetes (odds ratio [OR], 6.7; 95% confidence interval [CI], 2.6-17.6; P = .0001) and hypertension (OR, 1.6; 95% CI, 1.1-2.4; P = .009). Additional adjustment for SAT volume generally strengthened these associations (diabetes OR, 10.8; 95% CI, 4.1-29.0; hypertension OR, 2.5; 95% CI, 1.7-3.7; all P < .0001). These trends were similar but generally weaker in men. CONCLUSION High fat density, an indirect marker of fat quality, is associated with the propensity to store fat viscerally vs subcutaneously and is jointly characterized by an increased burden of CVD risk factors.
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Affiliation(s)
- Aaron J Yeoh
- National Heart, Lung, and Blood Institute Framingham Heart Study (A.J.Y., A.P., K.J.R., C.S.F.), Framingham, Massachusetts 01702-5827; Division of Endocrinology and Metabolism (C.S.F.), Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115; and Department of Radiology (U.H.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114
| | - Alison Pedley
- National Heart, Lung, and Blood Institute Framingham Heart Study (A.J.Y., A.P., K.J.R., C.S.F.), Framingham, Massachusetts 01702-5827; Division of Endocrinology and Metabolism (C.S.F.), Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115; and Department of Radiology (U.H.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114
| | - Klara J Rosenquist
- National Heart, Lung, and Blood Institute Framingham Heart Study (A.J.Y., A.P., K.J.R., C.S.F.), Framingham, Massachusetts 01702-5827; Division of Endocrinology and Metabolism (C.S.F.), Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115; and Department of Radiology (U.H.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114
| | - Udo Hoffmann
- National Heart, Lung, and Blood Institute Framingham Heart Study (A.J.Y., A.P., K.J.R., C.S.F.), Framingham, Massachusetts 01702-5827; Division of Endocrinology and Metabolism (C.S.F.), Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115; and Department of Radiology (U.H.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114
| | - Caroline S Fox
- National Heart, Lung, and Blood Institute Framingham Heart Study (A.J.Y., A.P., K.J.R., C.S.F.), Framingham, Massachusetts 01702-5827; Division of Endocrinology and Metabolism (C.S.F.), Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115; and Department of Radiology (U.H.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114
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