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Giacobbi AS, Meyer L, Ribot M, Yvinec R, Soula H, Audebert C. Mathematical modeling of adipocyte size distributions: Identifiability and parameter estimation from rat data. J Theor Biol 2024; 581:111747. [PMID: 38278344 DOI: 10.1016/j.jtbi.2024.111747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 12/05/2023] [Accepted: 01/20/2024] [Indexed: 01/28/2024]
Abstract
Fat cells, called adipocytes, are designed to regulate energy homeostasis by storing energy in the form of lipids. Adipocyte size distribution is assumed to play a role in the development of obesity-related diseases. These cells that do not have a characteristic size, indeed a bimodal size distribution is observed in adipose tissue. We propose a model based on a partial differential equation to describe adipocyte size distribution. The model includes a description of the lipid fluxes and the cell size fluctuations and using a formulation of a stationary solution fast computation of bimodal distribution is achieved. We investigate the parameter identifiability and estimate parameter values with CMA-ES algorithm. We first validate the procedure on synthetic data, then we estimate parameter values with experimental data of 32 rats. We discuss the estimated parameter values and their variability within the population, as well as the relation between estimated values and their biological significance. Finally, a sensitivity analysis is performed to specify the influence of parameters on cell size distribution and explain the differences between the model and the measurements. The proposed framework enables the characterization of adipocyte size distribution with four parameters and can be easily adapted to measurements of cell size distribution in different health conditions.
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Affiliation(s)
- Anne-Sophie Giacobbi
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine (IBPS), Laboratory of Computational and Quantitative Biology UMR 7238, 75005 Paris, France.
| | - Leo Meyer
- Institut Denis Poisson, Université d'Orléans, CNRS, Université de Tours, 45067 Orléans, France
| | - Magali Ribot
- Institut Denis Poisson, Université d'Orléans, CNRS, Université de Tours, 45067 Orléans, France
| | - Romain Yvinec
- PRC, INRAE, CNRS, Université de Tours, 37380 Nouzilly, France; Université Paris-Saclay, Inria, Centre Inria de Saclay, 91120 Palaiseau, France
| | - Hedi Soula
- Nutriomics, La Pitié-Salpétrière, Sorbonne Université, CNRS, 75013 Paris, France
| | - Chloe Audebert
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine (IBPS), Laboratory of Computational and Quantitative Biology UMR 7238, 75005 Paris, France; Sorbonne Université, CNRS, Université de Paris, Laboratoire Jacques-Louis Lions UMR 7598, 75005 Paris, France.
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Tremblay EJ, Tchernof A, Pelletier M, Joanisse DR, Mauriège P. Plasma adiponectin/leptin ratio associates with subcutaneous abdominal and omental adipose tissue characteristics in women. BMC Endocr Disord 2024; 24:39. [PMID: 38481206 PMCID: PMC10938796 DOI: 10.1186/s12902-024-01567-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 03/05/2024] [Indexed: 03/17/2024] Open
Abstract
BACKGROUND A better understanding of adipose tissue (AT) dysfunction, which includes morphological and functional changes such as adipocyte hypertrophy as well as impaired adipogenesis, lipid storage/mobilization, endocrine and inflammatory responses, is needed in the context of obesity. One dimension of AT dysfunction, secretory adiposopathy, often assessed as a low plasma adiponectin (A)/leptin (L) ratio, is commonly observed in obesity. The aim of this study was to examine markers of AT development and metabolism in 67 women of varying age and adiposity (age: 40-62 years; body mass index, BMI: 17-41 kg/m2) according to levels of adiponectinemia, leptinemia or the plasma A/L ratio. METHODS Body composition, regional AT distribution and circulating adipokines were determined. Lipolysis was measured from glycerol release in subcutaneous abdominal (SCABD) and omental (OME) adipocytes under basal, isoproterenol-, forskolin (FSK)- and dibutyryl-cyclic AMP (DcAMP)-stimulated conditions. Adipogenesis (C/EBP-α/β/δ, PPAR-γ2 and SREBP-1c) and lipid metabolism (β2-ARs, HSL, FABP4, LPL and GLUT4) gene expression (RT-qPCR) was assessed in both fat depots. Participants in the upper versus lower tertile of adiponectin, leptin or the A/L ratio were compared. RESULTS Basal lipolysis was similar between groups. Women with a low plasma A/L ratio were characterized by higher adiposity and larger SCABD and OME adipocytes (p<0.01) compared to those with a high ratio. In OME adipocytes, women in the low adiponectinemia tertile showed higher isoproterenol-stimulated lipolysis (0.01 CONCLUSIONS Secretory adiposopathy assessed as the plasma A/L ratio, more so than adiponectin or leptin levels alone, discriminates low and elevated lipolysis in OME and SCABD adipocytes despite similar AT expression of selected genes involved in lipid metabolism.
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Affiliation(s)
- Eve-Julie Tremblay
- École de Nutrition, Faculté des sciences de l'agriculture et de l'alimentation, Université Laval, Québec City, Canada
- Centre de recherche de l'Institut Universitaire de Cardiologie et Pneumologie de Québec (CRIUCPQ), Université Laval, Québec City, Canada
| | - André Tchernof
- École de Nutrition, Faculté des sciences de l'agriculture et de l'alimentation, Université Laval, Québec City, Canada
- Centre de recherche de l'Institut Universitaire de Cardiologie et Pneumologie de Québec (CRIUCPQ), Université Laval, Québec City, Canada
| | - Mélissa Pelletier
- Centre de recherche de l'Institut Universitaire de Cardiologie et Pneumologie de Québec (CRIUCPQ), Université Laval, Québec City, Canada
| | - Denis R Joanisse
- Centre de recherche de l'Institut Universitaire de Cardiologie et Pneumologie de Québec (CRIUCPQ), Université Laval, Québec City, Canada
- Département de kinésiologie, Faculté de médecine, Université Laval, Québec City, Canada
| | - Pascale Mauriège
- Centre de recherche de l'Institut Universitaire de Cardiologie et Pneumologie de Québec (CRIUCPQ), Université Laval, Québec City, Canada.
- Département de kinésiologie, Faculté de médecine, Université Laval, Québec City, Canada.
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Jialal I, Adams-Huet B, Devaraj S. Increased Adipocyte Hypertrophy in Patients with Nascent Metabolic Syndrome. J Clin Med 2023; 12:4247. [PMID: 37445281 DOI: 10.3390/jcm12134247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/16/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023] Open
Abstract
Background and Aims: Metabolic Syndrome (MetS), a global problem, predisposes to an increased risk for type 2 diabetes and premature cardiovascular disease. While MetS is associated with central obesity, there is scanty data on adipocyte hypertrophy, increased fat cell size (FCS), in MetS. The aim of this study was to investigate FCS status in adipose tissue (AT) biopsy of patients with nascent MetS without the confounding of diabetes, cardiovascular disease, smoking, or lipid therapy. Methods and Results: Fasting blood and subcutaneous gluteal AT biopsies were obtained in MetS (n = 20) and controls (n = 19). Cardio-metabolic features, FFA levels, hsCRP, and HOMA-IR were significantly increased in patients with MetS. Waist-circumference (WC) adjusted-FCS was significantly increased in patients with MetS and increased with increasing severity of MetS. Furthermore, there were significant correlations between FCS with glucose, HDL-C, and the ratio of TG: HDL-C. There were significant correlations between FCS and FFA, as well as endotoxin and monocyte TLR4 abundance. Additionally, FCS correlated with readouts of NLRP3 Inflammasome activity. Most importantly, FCS correlated with markers of fibrosis and angiogenesis. Conclusions: In conclusion, in patients with nascent MetS, we demonstrate WC-adjusted increase in FCS from gluteal adipose tissue which correlated with cellular inflammation, fibrosis, and angiogenesis. While these preliminary observations were in gluteal fat, future studies are warranted to confirm these findings in visceral and other fat depots.
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Affiliation(s)
- Ishwarlal Jialal
- Veterans Affairs Medical Center, Mather, CA 95655, USA
- UCDavis School of Medicine and VA Medical Center, 10535 Hospital Way, Mather, CA 95655, USA
| | | | - Sridevi Devaraj
- Texas Children's Hospital and Baylor College of Medicine, Houston, TX 77030, USA
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Mittendorfer B, Kayser BD, Yoshino M, Yoshino J, Watrous JD, Jain M, Eagon JC, Patterson BW, Klein S. Heterogeneity in the effect of marked weight loss on metabolic function in women with obesity. JCI Insight 2023; 8:e169541. [PMID: 37159276 PMCID: PMC10371235 DOI: 10.1172/jci.insight.169541] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 05/03/2023] [Indexed: 05/10/2023] Open
Abstract
BACKGROUNDThere is considerable heterogeneity in the effect of weight loss on metabolic function in people with obesity.METHODSWe evaluated muscle and liver insulin sensitivity, body composition, and circulating factors associated with insulin action before and after approximately 20% weight loss in women identified as "Responders" (n = 11) or "Non-responders" (n = 11), defined as the top (>75% increase) and bottom (<5% increase) quartiles of the weight loss-induced increase in glucose disposal rate (GDR) during a hyperinsulinemic-euglycemic clamp procedure, among 43 women with obesity (BMI: 44.1 ± 7.9 kg/m2).RESULTSAt baseline, GDR, which provides an index of muscle insulin sensitivity, and the hepatic insulin sensitivity index were more than 50% lower in Responders than Non-responders, but both increased much more after weight loss in Responders than Non-responders, which eliminated the differences between groups. Weight loss also caused greater decreases in intrahepatic triglyceride content and plasma adiponectin and PAI-1 concentrations in Responders than Non-responders and greater insulin-mediated suppression of plasma free fatty acids, branched-chain amino acids, and C3/C5 acylcarnitines in Non-responders than Responders, so that differences between groups at baseline were no longer present after weight loss. The effect of weight loss on total body fat mass, intra-abdominal adipose tissue volume, adipocyte size, and circulating inflammatory markers were not different between groups.CONCLUSIONThe results from our study demonstrate that the heterogeneity in the effects of marked weight loss on muscle and hepatic insulin sensitivity in people with obesity is determined by baseline insulin action, and reaches a ceiling when "normal" insulin action is achieved.TRIAL REGISTRATIONNCT00981500, NCT01299519, NCT02207777.FUNDINGNIH grants P30 DK056341, P30 DK020579, P30 DK052574, UL1 TR002345, and T32 HL13035, the American Diabetes Association (1-18-ICTS-119), the Longer Life Foundation (2019-011), and the Atkins Philanthropic Trust.
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Affiliation(s)
- Bettina Mittendorfer
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Brandon D. Kayser
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri, USA
- Genentech, South San Francisco, California, USA
| | - Mihoko Yoshino
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Jun Yoshino
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri, USA
| | | | - Mohit Jain
- Department of Medicine, UCSD, La Jolla, California, USA
| | - J. Christopher Eagon
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Bruce W. Patterson
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Samuel Klein
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri, USA
- Sansum Diabetes Research Institute, Santa Barbara, California, USA
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The association between visceral adipocyte hypertrophy and NAFLD in subjects with different degrees of adiposity. Hepatol Int 2023; 17:215-224. [PMID: 36071305 DOI: 10.1007/s12072-022-10409-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 08/12/2022] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To investigate the association between visceral adipocyte hypertrophy and the onset and development of non-alcoholic fatty liver disease (NAFLD) in subjects with different degrees of adiposity. METHODS Omental adipose tissue and liver biopsies were collected from obese subjects. NAFLD was defined according to the NASH Clinical Research Network scoring system. Adipocyte size was measured using pathological section analysis. Adipose tissue insulin resistance (Adipo-IR) was calculated as fasting insulin (pmol/L) × fasting free fatty acid concentration (mmol/L). RESULTS In total, 275 obese patients were enrolled, including 158 females and 58 males with NAFLD. In females, adipocyte size was significantly larger in NAFLD participants as compared to the controls (99.37 ± 14.18 vs. 84.14 ± 12.65 [Formula: see text]m, p < 0.001). Moreover, adipocyte size was larger in females with non-alcoholic steatohepatitis (NASH) as compared to those with non-alcoholic fatty liver (NAFL) (101.45 ± 12.77 vs. 95.79 ± 15.80 [Formula: see text]m, p = 0.015). Mediation analysis showed that adipocyte size impacted the NAFLD activity score through Adipo-IR (b = 0.007 [95% bootstrap CI 0.002, 0.013]). Furthermore, the females were divided into: Q1 (BMI < 32.5 kg/m2), Q2 (BMI 32.5-35.5 kg/m2), Q3 (BMI 35.5-38.8 kg/m2) and Q4 (BMI ≥ 38.8 kg/m2) according to BMI quartiles. Omental adipocyte size was larger in NAFLD subjects in Q1-Q3, but not in Q4. No similar results were observed in males. CONCLUSION For the first time, we reported that visceral adipocyte hypertrophy was associated with the onset and progression of NAFLD in mild to moderate adiposity but not in severe obesity, which may be mediated by adipose tissue insulin resistance.
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Králová A, Kubátová H, Kauerová S, Janoušek L, Froněk J, Králová Lesná I, Poledne R. Cholesterol efflux and macrophage polarization in human adipose tissue. Physiol Res 2022. [DOI: 10.33549/physiolres.934926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The pro-inflammatory status of adipose tissue (AT) has been found to be related to reverse cholesterol transport (RCT) from peritoneal macrophages. However, this finding was made in experimental models using induced peritonitis and isolated peritoneal macrophages of animals. This experimental relationship is in agreement with RCT changes in man in two extreme situations, sepsis or cardiovascular complications.
Given the above, we sought to test RTC in relationship to macrophage polarization in the visceral AT (VAT) of living kidney donors (LKDs) and the effect of conditioned media obtained from their AT. The influence of ATCM on CE capacity was first assessed in an experiment where standard plasma was used as cholesterol acceptor from [14C] cholesterol labeled THP-1 cells. Conditioned media as a product of LKDs’ incubated AT showed no effect on CE. Likewise, we did not find any effect of individual plasma of LKDs on CE when individual plasma of LKDs were used as acceptors. On the other hand, we documented an effect of LKDs’ adipose cell size on CE. Our results indicate that the pro-inflammatory status of human AT is not likely induced by disrupted RCT but might be influenced by the metabolic status of LKDs’ adipose tissue.
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Affiliation(s)
| | | | | | | | | | | | - R Poledne
- Laboratory for Atherosclerosis Research, Institute for Clinical and Experimental Medicine, Prague, Czech Republic.
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Waddell HMM, Moore MK, Herbert-Olsen MA, Stiles MK, Tse RD, Coffey S, Lamberts RR, Aitken-Buck HM. Identifying sex differences in predictors of epicardial fat cell morphology. Adipocyte 2022; 11:325-334. [PMID: 35531882 PMCID: PMC9122305 DOI: 10.1080/21623945.2022.2073854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 04/28/2022] [Accepted: 05/02/2022] [Indexed: 11/12/2022] Open
Abstract
Predictors of overall epicardial adipose tissue deposition have been found to vary between males and females. Whether similar sex differences exist in epicardial fat cell morphology is currently unknown. This study aimed to determine whether epicardial fat cell size is associated with different clinical measurements in males and females. Fat cell sizes were measured from epicardial, paracardial, and appendix adipose tissues of post-mortem cases (N= 118 total, 37 females). Epicardial, extra-pericardial, and visceral fat volumes were measured by computed tomography from a subset of cases (N= 70, 22 females). Correlation analyses and stepwise linear regression were performed to identify predictors of fat cell size in males and females. Median fat cell sizes in all depots did not differ between males and females. Body mass index (BMI) and age were independently predictive of epicardial, paracardial, and appendix fat cell sizes in males, but not in females. Epicardial and appendix fat cell sizes were associated with epicardial and visceral fat volumes, respectively, in males only. In females, paracardial fat cell size was associated with extra-pericardial fat volume, while appendix fat cell size was associated with BMI only. No predictors were associated with epicardial fat cell size in females at the univariable or multivariable levels. To conclude, no clinical measurements were useful surrogates of epicardial fat cell size in females, while BMI, age, and epicardial fat volume were independent, albeit weak, predictors in males only.
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Affiliation(s)
- Helen M. M. Waddell
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Matthew K. Moore
- Department of Medicine, HeartOtago, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Morgan A. Herbert-Olsen
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Martin K. Stiles
- Department of Cardiology, Waikato District Health Board, Hamilton, New Zealand
- Waikato Clinical School, University of Auckland, Hamilton, New Zealand
| | - Rexson D. Tse
- Department of Forensic Pathology, LabPLUS, Auckland City Hospital, Auckland, New Zealand
| | - Sean Coffey
- Department of Medicine, HeartOtago, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
- Department of Cardiology, Dunedin Hospital, Southern District Health Board, Dunedin, New Zealand
| | - Regis R. Lamberts
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Hamish M. Aitken-Buck
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
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Tremblay EJ, Tchernof A, Pelletier M, Chabot N, Joanisse DR, Mauriège P. Contribution of markers of adiposopathy and adipose cell size in predicting insulin resistance in women of varying age and adiposity. Adipocyte 2022; 11:175-189. [PMID: 35436409 PMCID: PMC9037496 DOI: 10.1080/21623945.2022.2059902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Adipose tissue (AT) dysfunctions, such as adipocyte hypertrophy, macrophage infiltration and secretory adiposopathy (low plasma adiponectin/leptin, A/L, ratio), associate with metabolic disorders. However, no study has compared the relative contribution of these markers to cardiometabolic risk in women of varying age and adiposity. Body composition, regional AT distribution, lipid-lipoprotein profile, glucose homeostasis and plasma A and L levels were determined in 67 women (age: 40-62 years; BMI: 17-41 kg/m2). Expression of macrophage infiltration marker CD68 and adipocyte size were measured from subcutaneous abdominal (SCABD) and omental (OME) fat. AT dysfunction markers correlated with most lipid-lipoprotein levels. The A/L ratio was negatively associated with fasting insulinemia and HOMA-IR, while SCABD or OME adipocyte size and SCABD CD68 expression were positively related to these variables. Combination of tertiles of largest adipocyte size and lowest A/L ratio showed the highest HOMA-IR. Multiple regression analyses including these markers and TAG levels revealed that the A/L ratio was the only predictor of fasting insulinemia and HOMA-IR. The contribution of the A/L ratio was superseded by adipose cell size in the model where the latter replaced TAGs. Finally, leptinemia was a better predictor of IR than adipocyte size and the A/L ratio in our participants sample.
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Affiliation(s)
- Eve-Julie Tremblay
- Département de kinésiologie, Faculté de médecine, Université Laval, Québec, Canada
- Centre de recherche de l’institut Universitaire de cardiologie et pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Canada
| | - André Tchernof
- Centre de recherche de l’institut Universitaire de cardiologie et pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Canada
- École de Nutrition, Faculté des sciences de l’agriculture et de l’alimentation, Université Laval, Québec, Canada
| | - Mélissa Pelletier
- Centre de recherche de l’institut Universitaire de cardiologie et pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Canada
| | - Nicolas Chabot
- Département de kinésiologie, Faculté de médecine, Université Laval, Québec, Canada
- Centre de recherche de l’institut Universitaire de cardiologie et pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Canada
| | - Denis R. Joanisse
- Département de kinésiologie, Faculté de médecine, Université Laval, Québec, Canada
- Centre de recherche de l’institut Universitaire de cardiologie et pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Canada
| | - Pascale Mauriège
- Département de kinésiologie, Faculté de médecine, Université Laval, Québec, Canada
- Centre de recherche de l’institut Universitaire de cardiologie et pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Canada
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The Effects of Shear Force-Based Processing of Lipoaspirates on White Adipose Tissue and the Differentiation Potential of Adipose Derived Stem Cells. Cells 2022; 11:cells11162543. [PMID: 36010620 PMCID: PMC9406387 DOI: 10.3390/cells11162543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/09/2022] [Accepted: 08/11/2022] [Indexed: 11/17/2022] Open
Abstract
Autologous lipotransfer is a promising method for tissue regeneration, because white adipose tissue contains a heterogeneous cell population, including mesenchymal stem cells, endothelial cells, immune cells, and adipocytes. In order to improve the outcome, adipose tissue can be processed before application. In this study, we investigated changes caused by mechanical processing. Lipoaspirates were processed using sedimentation, first-time centrifugation, shear-force homogenization, and second-time centrifugation. The average adipocyte size, stromal vascular cell count, and adipocyte depot size were examined histologically at every processing step. In addition, the adipose derived stem cells (ADSCs) were isolated and differentiated osteogenically and adipogenically. While homogenization causes a disruption of adipocyte depots, the shape of the remaining adipocytes is not changed. On average, these adipocytes are smaller than the depot adipocytes, they are surrounded by the ECM, and therefore mechanically more stable. The volume loss of adipocyte depots leads to a significant enrichment of stromal vascular cells such as ADSCs. However, the mechanical processing does not change the potential of the ADSCs to differentiate adipogenically or osteogenically. It thus appears that mechanically processed lipoaspirates are promising for the reparation of even mechanically stressed tissue as that found in nasolabial folds. The changes resulting from the processing correspond more to a filtration of mechanically less stable components than to a manipulation of the tissue.
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Zhang X, Li W, Zhou T, Liu M, Wu Q, Dong N. Corin Deficiency Alters Adipose Tissue Phenotype and Impairs Thermogenesis in Mice. BIOLOGY 2022; 11:biology11081101. [PMID: 35892957 PMCID: PMC9329919 DOI: 10.3390/biology11081101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/18/2022] [Accepted: 07/20/2022] [Indexed: 11/16/2022]
Abstract
Atrial natriuretic peptide (ANP) is a key regulator in body fluid balance and cardiovascular biology. In addition to its role in enhancing natriuresis and vasodilation, ANP increases lipolysis and thermogenesis in adipose tissue. Corin is a protease responsible for ANP activation. It remains unknown if corin has a role in regulating adipose tissue function. Here, we examined adipose tissue morphology and function in corin knockout (KO) mice. We observed increased weights and cell sizes in white adipose tissue (WAT), decreased levels of uncoupling protein 1 (Ucp1), a brown adipocyte marker in WAT and brown adipose tissue (BAT), and suppressed thermogenic gene expression in BAT from corin KO mice. At regular room temperature, corin KO and wild-type mice had similar metabolic rates. Upon cold exposure at 4 °C, corin KO mice exhibited impaired thermogenic responses and developed hypothermia. In BAT from corin KO mice, the signaling pathway of p38 mitogen-activated protein kinase, peroxisome proliferator-activated receptor c coactivator 1a, and Ucp1 was impaired. In cell culture, ANP treatment increased Ucp1 expression in BAT-derived adipocytes from corin KO mice. These data indicate that corin mediated-ANP activation is an important hormonal mechanism in regulating adipose tissue function and body temperature upon cold exposure in mice.
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Affiliation(s)
- Xianrui Zhang
- Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Collaborative Innovation Center of Hematology, State Key Laboratory of Radiation Medicine and Prevention, Soochow University, Suzhou 215123, China; (X.Z.); (W.L.); (T.Z.); (M.L.)
- MOH Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Wenguo Li
- Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Collaborative Innovation Center of Hematology, State Key Laboratory of Radiation Medicine and Prevention, Soochow University, Suzhou 215123, China; (X.Z.); (W.L.); (T.Z.); (M.L.)
- MOH Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Tiantian Zhou
- Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Collaborative Innovation Center of Hematology, State Key Laboratory of Radiation Medicine and Prevention, Soochow University, Suzhou 215123, China; (X.Z.); (W.L.); (T.Z.); (M.L.)
| | - Meng Liu
- Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Collaborative Innovation Center of Hematology, State Key Laboratory of Radiation Medicine and Prevention, Soochow University, Suzhou 215123, China; (X.Z.); (W.L.); (T.Z.); (M.L.)
| | - Qingyu Wu
- Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Collaborative Innovation Center of Hematology, State Key Laboratory of Radiation Medicine and Prevention, Soochow University, Suzhou 215123, China; (X.Z.); (W.L.); (T.Z.); (M.L.)
- Correspondence: (Q.W.); (N.D.)
| | - Ningzheng Dong
- Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Collaborative Innovation Center of Hematology, State Key Laboratory of Radiation Medicine and Prevention, Soochow University, Suzhou 215123, China; (X.Z.); (W.L.); (T.Z.); (M.L.)
- MOH Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
- Correspondence: (Q.W.); (N.D.)
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Ostinelli G, Laforest S, Denham SG, Gauthier MF, Drolet-Labelle V, Scott E, Hould FS, Marceau S, Homer NZM, Bégin C, Andrew R, Tchernof A. Increased Adipose Tissue Indices of Androgen Catabolism and Aromatization in Women With Metabolic Dysfunction. J Clin Endocrinol Metab 2022; 107:e3330-e3342. [PMID: 35511873 PMCID: PMC9282357 DOI: 10.1210/clinem/dgac261] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Indexed: 02/02/2023]
Abstract
CONTEXT Body fat distribution is a risk factor for obesity-associated comorbidities, and adipose tissue dysfunction plays a role in this association. In humans, there is a sex difference in body fat distribution, and steroid hormones are known to regulate several cellular processes within adipose tissue. OBJECTIVE Our aim was to investigate if intra-adipose steroid concentration and expression or activity of steroidogenic enzymes were associated with features of adipose tissue dysfunction in individuals with severe obesity. METHODS Samples from 40 bariatric candidates (31 women, 9 men) were included in the study. Visceral (VAT) and subcutaneous adipose tissue (SAT) were collected during surgery. Adipose tissue morphology was measured by a combination of histological staining and semi-automated quantification. Following extraction, intra-adipose and plasma steroid concentrations were determined by liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). Aromatase activity was estimated using product over substrate ratio, while AKR1C2 activity was measured directly by fluorogenic probe. Gene expression was measured by quantitative PCR. RESULTS VAT aromatase activity was positively associated with VAT adipocyte hypertrophy (P valueadj < 0.01) and negatively with plasma high-density lipoprotein (HDL)-cholesterol (P valueadj < 0.01), while SAT aromatase activity predicted dyslipidemia in women even after adjustment for waist circumference, age, and hormonal contraceptive use. We additionally compared women with high and low visceral adiposity index (VAI) and found that VAT excess is characterized by adipose tissue dysfunction, increased androgen catabolism mirrored by increased AKR1C2 activity, and higher aromatase expression and activity indices. CONCLUSION In women, increased androgen catabolism or aromatization is associated with visceral adiposity and adipose tissue dysfunction.
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Affiliation(s)
- Giada Ostinelli
- Centre de recherche de l’Institut universitaire de cardiologie et pneumologie de Québec-Université Laval, Québec City, QC G1V 4G5, Canada
- École de nutrition, Université Laval, Québec City, QC G1V 0A6, Canada
| | - Sofia Laforest
- Centre de recherche de l’Institut universitaire de cardiologie et pneumologie de Québec-Université Laval, Québec City, QC G1V 4G5, Canada
- École de nutrition, Université Laval, Québec City, QC G1V 0A6, Canada
- University of Strathclyde, Glasgow G1 1XQ, UK
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, University/BHF, Cardiovascular Sciences, University of Edinburgh, Queen’s Medical Research Institute, Edinburgh, EH16 4TJ, UK
| | - Scott G Denham
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, University/BHF, Cardiovascular Sciences, University of Edinburgh, Queen’s Medical Research Institute, Edinburgh, EH16 4TJ, UK
| | - Marie-Frederique Gauthier
- Centre de recherche de l’Institut universitaire de cardiologie et pneumologie de Québec-Université Laval, Québec City, QC G1V 4G5, Canada
| | | | - Emma Scott
- Faculté de médecine, Université Laval, Québec City, QC G1V 0A6, Canada
| | - Frédéric-Simon Hould
- Centre de recherche de l’Institut universitaire de cardiologie et pneumologie de Québec-Université Laval, Québec City, QC G1V 4G5, Canada
- Faculté de médecine, Université Laval, Québec City, QC G1V 0A6, Canada
| | - Simon Marceau
- Centre de recherche de l’Institut universitaire de cardiologie et pneumologie de Québec-Université Laval, Québec City, QC G1V 4G5, Canada
- Faculté de médecine, Université Laval, Québec City, QC G1V 0A6, Canada
| | - Natalie Z M Homer
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, University/BHF, Cardiovascular Sciences, University of Edinburgh, Queen’s Medical Research Institute, Edinburgh, EH16 4TJ, UK
| | - Catherine Bégin
- Centre de recherche de l’Institut universitaire de cardiologie et pneumologie de Québec-Université Laval, Québec City, QC G1V 4G5, Canada
- École de psychologie, Université Laval, Québec City, QC G1V 0A6, Canada
| | - Ruth Andrew
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, University/BHF, Cardiovascular Sciences, University of Edinburgh, Queen’s Medical Research Institute, Edinburgh, EH16 4TJ, UK
- BHF/CVS, Queen’s Medical Research Institute, University of Edinburgh, EH16 4TJ, UK
| | - André Tchernof
- Correspondence: Andre Tchernof, PhD, Quebec Heart and Lung Institute, School of Nutrition, Laval University, 2725 Chemin Sainte-Foy (Y-4212), Québec, QC G1V 4G5, Canada.
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12
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Honecker J, Ruschke S, Seeliger C, Laber S, Strobel S, Pröll P, Nellaker C, Lindgren CM, Kulozik U, Ecker J, Karampinos DC, Claussnitzer M, Hauner H. Transcriptome and fatty-acid signatures of adipocyte hypertrophy and its non-invasive MR-based characterization in human adipose tissue. EBioMedicine 2022; 79:104020. [PMID: 35490555 PMCID: PMC9062743 DOI: 10.1016/j.ebiom.2022.104020] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 04/07/2022] [Accepted: 04/07/2022] [Indexed: 12/13/2022] Open
Abstract
Background The adipocyte-hypertrophy associated remodeling of fat cell function is considered causal for the development of metabolic disorders. A better understanding of transcriptome and fatty acid (FA) related alterations with adipocyte hypertrophy combined with less-invasive strategies for the detection of the latter can help to increase the prognostic and diagnostic value of adipocyte size and FA composition as markers for metabolic disease. Methods To clarify adipocyte-hypertrophy associated transcriptomic alterations, fat cell size was related to RNA-Seq data from white adipose tissue and size-separated adipocytes. The relationship between adipocyte size and adipose tissue FA composition as measured by GC-MS was investigated. MR spectroscopy (MRS) methods for clinical scanning were developed to characterize adipocyte size and FA composition in a fast and non-invasive manner. Findings With enlarged adipocyte size, substantial transcriptomic alterations of genes involved in mitochondrial function and FA metabolism were observed. Investigations of these two mechanisms revealed a reciprocal relationship between adipocyte size and estimated thermogenic adipocyte content as well as depot-specific correlations of adipocyte size and FA composition. MRS on a clinical scanner was suitable for the in-parallel assessment of adipose morphology and FA composition. Interpretation The current study provides a comprehensive overview of the adipocyte-hypertrophy associated transcriptomic and FA landscape in both subcutaneous and visceral adipose tissue. MRS represents a promising technique to translate the observed mechanistic, structural and functional changes in WAT with adipocyte hypertrophy into a clinical context for an improved phenotyping of WAT in the context of metabolic diseases. Funding Competence network for obesity (FKZ 42201GI1128), ERC (No 677661, ProFatMRI; No 875488, FatVirtualBiopsy), Else Kröner-Fresenius-Foundation.
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13
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Kurgan N, Islam H, Matusiak JBL, Baranowski BJ, Stoikos J, Fajardo VA, MacPherson REK, Gurd BJ, Klentrou P. Subcutaneous adipose tissue sclerostin is reduced and Wnt signaling is enhanced following 4-weeks of sprint interval training in young men with obesity. Physiol Rep 2022; 10:e15232. [PMID: 35312183 PMCID: PMC8935536 DOI: 10.14814/phy2.15232] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/28/2022] [Accepted: 03/01/2022] [Indexed: 06/01/2023] Open
Abstract
Sclerostin is a Wnt/β-catenin antagonist, mainly secreted by osteocytes, and most known for its role in reducing bone formation. Studies in rodents suggest sclerostin can also regulate adipose tissue mass and metabolism, representing bone-adipose tissue crosstalk. Exercise training has been shown to reduce plasma sclerostin levels; but the effects of exercise on sclerostin and Wnt/β-catenin signaling specifically within adipose tissue has yet to be examined. The purpose of this study was to examine subcutaneous WAT (scWAT) sclerostin content and Wnt signaling in response to exercise training in young men with obesity. To this end, 7 male participants (BMI = 35 ± 4; 25 ± 4 years) underwent 4 weeks of sprint interval training (SIT) involving 4 weekly sessions consisting of a 5-min warmup, followed by 8 × 20 s intervals at 170% of work rate at VO2peak , separated by 10 s of rest. Serum and scWAT were sampled at rest both pre- and post-SIT. Despite no changes in serum sclerostin levels, we found a significant decrease in adipose sclerostin content (-37%, p = 0.04), an increase in total β-catenin (+52%, p = 0.03), and no changes in GSK3β serine 9 phosphorylation. There were also concomitant reductions in serum TNF-α (-0.36 pg/ml, p = 0.03) and IL-6 (-1.44 pg/ml, p = 0.05) as well as an increase in VO2peak (+5%, p = 0.03) and scWAT COXIV protein content (+95%, p = 0.04). In conclusion, scWAT sclerostin content was reduced and β-catenin content was increased following SIT in young men with excess adiposity, suggesting a role of sclerostin in regulating human adipose tissue in response to exercise training.
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Affiliation(s)
- Nigel Kurgan
- Department of KinesiologyBrock UniversitySt. CatharinesOntarioCanada
- Centre for Bone and Muscle HealthBrock UniversitySt. CatharinesOntarioCanada
| | - Hashim Islam
- School of Health and Exercise SciencesUniversity of British Columbia OkanaganKelownaBritish ColumbiaCanada
| | | | - Bradley J. Baranowski
- Centre for Bone and Muscle HealthBrock UniversitySt. CatharinesOntarioCanada
- Department of Health SciencesBrock UniversitySt. CatharinesOntarioCanada
| | - Joshua Stoikos
- Department of KinesiologyBrock UniversitySt. CatharinesOntarioCanada
- Centre for Bone and Muscle HealthBrock UniversitySt. CatharinesOntarioCanada
| | - Val A. Fajardo
- Department of KinesiologyBrock UniversitySt. CatharinesOntarioCanada
- Centre for Bone and Muscle HealthBrock UniversitySt. CatharinesOntarioCanada
| | | | - Brendon J. Gurd
- Department of KinesiologyQueens UniversityKingstonOntarioCanada
| | - Panagiota Klentrou
- Department of KinesiologyBrock UniversitySt. CatharinesOntarioCanada
- Centre for Bone and Muscle HealthBrock UniversitySt. CatharinesOntarioCanada
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14
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Ye RZ, Richard G, Gévry N, Tchernof A, Carpentier AC. Fat Cell Size: Measurement Methods, Pathophysiological Origins, and Relationships With Metabolic Dysregulations. Endocr Rev 2022; 43:35-60. [PMID: 34100954 PMCID: PMC8755996 DOI: 10.1210/endrev/bnab018] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Indexed: 11/19/2022]
Abstract
The obesity pandemic increasingly causes morbidity and mortality from type 2 diabetes, cardiovascular diseases and many other chronic diseases. Fat cell size (FCS) predicts numerous obesity-related complications such as lipid dysmetabolism, ectopic fat accumulation, insulin resistance, and cardiovascular disorders. Nevertheless, the scarcity of systematic literature reviews on this subject is compounded by the use of different methods by which FCS measurements are determined and reported. In this paper, we provide a systematic review of the current literature on the relationship between adipocyte hypertrophy and obesity-related glucose and lipid dysmetabolism, ectopic fat accumulation, and cardiovascular disorders. We also review the numerous mechanistic origins of adipocyte hypertrophy and its relationship with metabolic dysregulation, including changes in adipogenesis, cell senescence, collagen deposition, systemic inflammation, adipokine secretion, and energy balance. To quantify the effect of different FCS measurement methods, we performed statistical analyses across published data while controlling for body mass index, age, and sex.
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Affiliation(s)
- Run Zhou Ye
- Division of Endocrinology, Department of Medicine, Centre de recherche du Centre hospitalier universitaire de Sherbrooke, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Gabriel Richard
- Division of Endocrinology, Department of Medicine, Centre de recherche du Centre hospitalier universitaire de Sherbrooke, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Nicolas Gévry
- Department of Biology, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - André Tchernof
- Québec Heart and Lung Research Institute, Laval University, Québec, Québec, Canada
| | - André C Carpentier
- Division of Endocrinology, Department of Medicine, Centre de recherche du Centre hospitalier universitaire de Sherbrooke, Université de Sherbrooke, Sherbrooke, Québec, Canada
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15
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Pincu Y, Yoel U, Haim Y, Makarenkov N, Maixner N, Shaco-Levy R, Bashan N, Dicker D, Rudich A. Assessing Obesity-Related Adipose Tissue Disease (OrAD) to Improve Precision Medicine for Patients Living With Obesity. Front Endocrinol (Lausanne) 2022; 13:860799. [PMID: 35574032 PMCID: PMC9098964 DOI: 10.3389/fendo.2022.860799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 03/15/2022] [Indexed: 12/21/2022] Open
Abstract
Obesity is a heterogenous condition that affects the life and health of patients to different degrees and in different ways. Yet, most approaches to treat obesity are not currently prescribed, at least in a systematic manner, based on individual obesity sub-phenotypes or specifically-predicted health risks. Adipose tissue is one of the most evidently affected tissues in obesity. The degree of adipose tissue changes - "adiposopathy", or as we propose to relate to herein as Obesity-related Adipose tissue Disease (OrAD), correspond, at least cross-sectionally, to the extent of obesity-related complications inflicted on an individual patient. This potentially provides an opportunity to better personalize anti-obesity management by utilizing the information that can be retrieved by assessing OrAD. This review article will summarize current knowledge on histopathological OrAD features which, beyond cross-sectional analyses, had been shown to predict future obesity-related endpoints and/or the response to specific anti-obesity interventions. In particular, the review explores adipocyte cell size, adipose tissue inflammation, and fibrosis. Rather than highly-specialized methods, we emphasize standard pathology laboratory approaches to assess OrAD, which are readily-available in most clinical settings. We then discuss how OrAD assessment can be streamlined in the obesity/weight-management clinic. We propose that current studies provide sufficient evidence to inspire concerted efforts to better explore the possibility of predicting obesity related clinical endpoints and response to interventions by histological OrAD assessment, in the quest to improve precision medicine in obesity.
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Affiliation(s)
- Yair Pincu
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
- Department of Health and Exercise Science, University of Oklahoma, Norman, OK, United States
- Harold Hamm Diabetes Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Uri Yoel
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
- The Endocrinology Service, Soroka University Medical Center, Beer-Sheva, Israel
| | - Yulia Haim
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
- The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Nataly Makarenkov
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
| | - Nitzan Maixner
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
| | - Ruthy Shaco-Levy
- Institute of Pathology, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Nava Bashan
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
| | - Dror Dicker
- Department of Internal Medicine D, Hasharon Hospital, Rabin Medical Center, Petah Tikva, Israel
- Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel
- *Correspondence: Assaf Rudich, ; Dror Dicker,
| | - Assaf Rudich
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
- The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- *Correspondence: Assaf Rudich, ; Dror Dicker,
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16
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Koh HCE, van Vliet S, Pietka TA, Meyer GA, Razani B, Laforest R, Gropler RJ, Mittendorfer B. Subcutaneous Adipose Tissue Metabolic Function and Insulin Sensitivity in People With Obesity. Diabetes 2021; 70:2225-2236. [PMID: 34266892 PMCID: PMC8576507 DOI: 10.2337/db21-0160] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 07/08/2021] [Indexed: 11/13/2022]
Abstract
We used stable isotope-labeled glucose and palmitate tracer infusions, a hyperinsulinemic-euglycemic clamp, positron emission tomography of muscles and adipose tissue after [18F]fluorodeoxyglucose and [15O]water injections, and subcutaneous adipose tissue (SAT) biopsy to test the hypotheses that 1) increased glucose uptake in SAT is responsible for high insulin-stimulated whole-body glucose uptake in people with obesity who are insulin sensitive and 2) putative SAT factors thought to cause insulin resistance are present in people with obesity who are insulin resistant but not in those who are insulin sensitive. We found that high insulin-stimulated whole-body glucose uptake in insulin-sensitive participants with obesity was not due to channeling of glucose into SAT but, rather, was due to high insulin-stimulated muscle glucose uptake. Furthermore, insulin-stimulated muscle glucose uptake was not different between insulin-sensitive obese and lean participants even though adipocytes were larger, SAT perfusion and oxygenation were lower, and markers of SAT inflammation, fatty acid appearance in plasma in relation to fat-free mass, and plasma fatty acid concentration were higher in the insulin-sensitive obese than in lean participants. In addition, we observed only marginal or no differences in adipocyte size, SAT perfusion and oxygenation, and markers of SAT inflammation between insulin-resistant and insulin-sensitive obese participants. Plasma fatty acid concentration was also not different between insulin-sensitive and insulin-resistant obese participants, even though SAT was resistant to the inhibitory effect of insulin on lipolysis in the insulin-resistant obese group. These data suggest that several putative SAT factors commonly implicated in causing insulin resistance are normal consequences of SAT expansion unrelated to insulin resistance.
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Affiliation(s)
- Han-Chow E Koh
- Division of Geriatrics and Nutritional Science, Washington University School of Medicine, St. Louis, MO
| | - Stephan van Vliet
- Division of Geriatrics and Nutritional Science, Washington University School of Medicine, St. Louis, MO
| | - Terri A Pietka
- Division of Geriatrics and Nutritional Science, Washington University School of Medicine, St. Louis, MO
| | - Gretchen A Meyer
- Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO
| | - Babak Razani
- Division of Cardiology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Richard Laforest
- Department of Radiology, Washington University School of Medicine, St. Louis, MO
| | - Robert J Gropler
- Department of Radiology, Washington University School of Medicine, St. Louis, MO
| | - Bettina Mittendorfer
- Division of Geriatrics and Nutritional Science, Washington University School of Medicine, St. Louis, MO
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17
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Fernandes MR, Rezende KS, Inada AC, Freitas KDC, Filiú WFDO, Cavalheiro LF, Nazário CED, Hiane PA, Croda J, Tatara MB, Souza ASD, Pott A, Guimarães RDCA. High-Fat Diet with Lyophilized Acrocomia aculeata Pulp Increases High-Density Lipoprotein-Cholesterol Levels and Inhibits Adipocyte Hypertrophy in Mice. J Med Food 2021; 24:841-851. [PMID: 34342510 DOI: 10.1089/jmf.2020.0124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Obesity is a relevant health hazard characterized as a chronic noncommunicable disease, with severe comorbidities that cause mortality worldwide. Acrocomia aculeata is a Brazilian palm with edible fruits. Its pulp contains fibers, monounsaturated fatty acids (MUFAs), such as oleic acid and carotenoids. In this context, our study aimed to elucidate the protective effect of the lyophilized A. aculeata pulp added at the rates of 1%, 2%, and 4% to a high-fat (HF) diet (rich in saturated fats and cholesterol), for 90 days, in mice. The treatment with 4% pulp induced a significant increase in the biochemical parameters of serum cholesterol HDL-C (high-density lipoprotein) compared with the control. According to the evaluation of the epididymal tissue, the groups treated with A. aculeata pulp exhibited smaller fat deposits compared with the HF diet group. Therefore, we infer that the predominant components in A. aculeata, particularly fibers and MUFAs, promote beneficial effects on health parameters during simultaneous exposure to food rich in saturated fat and cholesterol, typical of the Western diet. This is the first study to correlate the presence of fatty acids from A. aculeata pulp in different proportions added in a HF diet with metabolic and histological parameters in Swiss mice.
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Affiliation(s)
- Melina Ribeiro Fernandes
- Post Graduate Program in Health and Development in the Central-West Region of Brazil, Federal University of Mato Grosso do Sul-UFMS, Campo Grande, MS, Brazil
| | - Karoline Silva Rezende
- Post Graduate Program in Health and Development in the Central-West Region of Brazil, Federal University of Mato Grosso do Sul-UFMS, Campo Grande, MS, Brazil
| | - Aline Carla Inada
- Post Graduate Program in Health and Development in the Central-West Region of Brazil, Federal University of Mato Grosso do Sul-UFMS, Campo Grande, MS, Brazil
| | - Karine de Cássia Freitas
- Post Graduate Program in Health and Development in the Central-West Region of Brazil, Federal University of Mato Grosso do Sul-UFMS, Campo Grande, MS, Brazil
| | | | | | | | - Priscila Aiko Hiane
- Post Graduate Program in Health and Development in the Central-West Region of Brazil, Federal University of Mato Grosso do Sul-UFMS, Campo Grande, MS, Brazil
| | - Júlio Croda
- Health Science Research Laboratory, Federal University of Grande Dourados, Dourados, MS, Brazil.,School of Medicine, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil.,Oswaldo Cruz Foundation, Campo Grande, MS, Brazil
| | - Mariana Bento Tatara
- Health Science Research Laboratory, Federal University of Grande Dourados, Dourados, MS, Brazil
| | - Albert Schiavetode de Souza
- Post Graduate Program in Health and Development in the Central-West Region of Brazil, Federal University of Mato Grosso do Sul-UFMS, Campo Grande, MS, Brazil
| | - Arnildo Pott
- Graduate Program in Biotechnology and Biodiversity, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil
| | - Rita de Cássia Avellaneda Guimarães
- Post Graduate Program in Health and Development in the Central-West Region of Brazil, Federal University of Mato Grosso do Sul-UFMS, Campo Grande, MS, Brazil
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18
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Koc M, Wald M, Varaliová Z, Ondrůjová B, Čížková T, Brychta M, Kračmerová J, Beranová L, Pala J, Šrámková V, Šiklová M, Gojda J, Rossmeislová L. Lymphedema alters lipolytic, lipogenic, immune and angiogenic properties of adipose tissue: a hypothesis-generating study in breast cancer survivors. Sci Rep 2021; 11:8171. [PMID: 33854130 PMCID: PMC8046998 DOI: 10.1038/s41598-021-87494-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 03/30/2021] [Indexed: 12/26/2022] Open
Abstract
Later stages of secondary lymphedema are associated with the massive deposition of adipose tissue (AT). The factors driving lymphedema-associated AT (LAT) expansion in humans remain rather elusive. We hypothesized that LAT expansion could be based on alterations of metabolic, adipogenic, immune and/or angiogenic qualities of AT. AT samples were acquired from upper limbs of 11 women with unilateral breast cancer-related lymphedema and 11 healthy women without lymphedema. Additional control group of 11 female breast cancer survivors without lymphedema was used to assess systemic effects of lymphedema. AT was analysed for adipocyte size, lipolysis, angiogenesis, secretion of cytokines, immune and stem cell content and mRNA gene expression. Further, adipose precursors were isolated and tested for their proliferative and adipogenic capacity. The effect of undrained LAT- derived fluid on adipogenesis was also examined. Lymphedema did not have apparent systemic effect on metabolism and cytokine levels, but it was linked with higher lymphocyte numbers and altered levels of several miRNAs in blood. LAT showed higher basal lipolysis, (lymph)angiogenic capacity and secretion of inflammatory cytokines when compared to healthy AT. LAT contained more activated CD4+ T lymphocytes than healthy AT. mRNA levels of (lymph)angiogenic markers were deregulated in LAT and correlated with markers of lipolysis. In vitro, adipose cells derived from LAT did not differ in their proliferative, adipogenic, lipogenic and lipolytic potential from cells derived from healthy AT. Nevertheless, exposition of preadipocytes to LAT-derived fluid improved their adipogenic conversion when compared with the effect of serum. This study presents results of first complex analysis of LAT from upper limb of breast cancer survivors. Identified LAT alterations indicate a possible link between (lymph)angiogenesis and lipolysis. In addition, our in vitro results imply that AT expansion in lymphedema could be driven partially by exposition of adipose precursors to undrained LAT-derived fluid.
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Affiliation(s)
- Michal Koc
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic
| | - Martin Wald
- Department of Surgery, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague 5, Czech Republic
| | - Zuzana Varaliová
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic
| | - Barbora Ondrůjová
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic
| | - Terezie Čížková
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic
| | - Milan Brychta
- Department of Radiotherapy and Oncology, Kralovske Vinohrady University Hospital, Prague 10, Czech Republic
| | - Jana Kračmerová
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic
| | - Lenka Beranová
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic
| | - Jan Pala
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic
| | - Veronika Šrámková
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic.,Franco-Czech Laboratory for Clinical Research on Obesity, Third Faculty of Medicine, Prague 10, Czech Republic
| | - Michaela Šiklová
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic.,Franco-Czech Laboratory for Clinical Research on Obesity, Third Faculty of Medicine, Prague 10, Czech Republic
| | - Jan Gojda
- Franco-Czech Laboratory for Clinical Research on Obesity, Third Faculty of Medicine, Prague 10, Czech Republic.,Second Internal Medicine Department, Kralovske Vinohrady University Hospital, Prague 10, Czech Republic
| | - Lenka Rossmeislová
- Department of Pathophysiology, Centre for Research On Nutrition, Metabolism and Diabetes, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic. .,Franco-Czech Laboratory for Clinical Research on Obesity, Third Faculty of Medicine, Prague 10, Czech Republic.
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Weidlich D, Honecker J, Boehm C, Ruschke S, Junker D, Van AT, Makowski MR, Holzapfel C, Claussnitzer M, Hauner H, Karampinos DC. Lipid droplet-size mapping in human adipose tissue using a clinical 3T system. Magn Reson Med 2021; 86:1256-1270. [PMID: 33797107 DOI: 10.1002/mrm.28755] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 02/08/2021] [Accepted: 02/08/2021] [Indexed: 11/07/2022]
Abstract
PURPOSE To develop a methodology for probing lipid droplet sizes with a clinical system based on a diffusion-weighted stimulated echo-prepared turbo spin-echo sequence and to validate the methodology in water-fat emulsions and show its applicability in ex vivo adipose-tissue samples. METHODS A diffusion-weighted stimulated echo-prepared preparation was combined with a single-shot turbo spin-echo readout for measurements at different b-values and diffusion times. The droplet size was estimated with an analytical expression, and three fitting approaches were compared: magnitude-based spatial averaging with voxel-wise residual minimization, complex-based spatial averaging with voxel-wise residual minimization, and complex-based spatial averaging with neighborhood-regularized residual minimization. Simulations were performed to characterize the fitting residual landscape and the approaches' noise performance. The applicability was assessed in oil-in-water emulsions in comparison with laser deflection and in ten human white adipose tissue samples in comparison with histology. RESULTS The fitting residual landscape showed a minimum valley with increasing extent as the droplet size increased. In phantoms, a very good agreement of the mean droplet size was observed between the diffusion-weighted MRI-based and the laser deflection measurements, showing the best performance with complex-based spatial averaging with neighborhood-regularized residual minimization processing (R2 /P: 0.971/0.014). In the human adipose-tissue samples, complex-based spatial averaging with neighborhood-regularized residual minimization processing showed a significant correlation (R2 /P: 0.531/0.017) compared with histology. CONCLUSION The proposed acquisition and parameter-estimation methodology was able to probe restricted diffusion effects in lipid droplets. The methodology was validated using phantoms, and its feasibility in measuring an apparent lipid droplet size was demonstrated ex vivo in white adipose tissue.
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Affiliation(s)
- Dominik Weidlich
- Department of Diagnostic and Interventional Radiology, School of Medicine, Technical University of Munich, Munich, Germany
| | - Julius Honecker
- Else Kröner Fresenius Center for Nutritional Medicine, School of Life Sciences, Technical University of Munich, Munich, Germany
| | - Christof Boehm
- Department of Diagnostic and Interventional Radiology, School of Medicine, Technical University of Munich, Munich, Germany
| | - Stefan Ruschke
- Department of Diagnostic and Interventional Radiology, School of Medicine, Technical University of Munich, Munich, Germany
| | - Daniela Junker
- Department of Diagnostic and Interventional Radiology, School of Medicine, Technical University of Munich, Munich, Germany
| | - Anh T Van
- Department of Diagnostic and Interventional Radiology, School of Medicine, Technical University of Munich, Munich, Germany
| | - Marcus R Makowski
- Department of Diagnostic and Interventional Radiology, School of Medicine, Technical University of Munich, Munich, Germany
| | - Christina Holzapfel
- Institute for Nutritional Medicine, School of Medicine, Technical University of Munich, Munich, Germany
| | - Melina Claussnitzer
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA.,Division of Gerontology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.,Harvard Medical School, Harvard University, Boston, Massachusetts, USA
| | - Hans Hauner
- Else Kröner Fresenius Center for Nutritional Medicine, School of Life Sciences, Technical University of Munich, Munich, Germany.,Institute for Nutritional Medicine, School of Medicine, Technical University of Munich, Munich, Germany
| | - Dimitrios C Karampinos
- Department of Diagnostic and Interventional Radiology, School of Medicine, Technical University of Munich, Munich, Germany
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20
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A distribution-centered approach for analyzing human adipocyte size estimates and their association with obesity-related traits and mitochondrial function. Int J Obes (Lond) 2021; 45:2108-2117. [PMID: 34172828 PMCID: PMC8380540 DOI: 10.1038/s41366-021-00883-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 06/10/2021] [Indexed: 02/05/2023]
Abstract
OBJECTIVE Cell diameter, area, and volume are established quantitative measures of adipocyte size. However, these different adipocyte sizing parameters have not yet been directly compared regarding their distributions. Therefore, the study aimed to investigate how these adipocyte size measures differ in their distribution and assessed their correlation with anthropometry and laboratory chemistry. In addition, we were interested to investigate the relationship between fat cell size and adipocyte mitochondrial respiratory chain capacity. METHODS Subcutaneous and visceral histology-based adipocyte size estimates from 188 individuals were analyzed by applying a panel of parameters to describe the underlying cell population. Histology-based adipocyte diameter distributions were compared with adipocyte diameter distributions from collagenase digestion. Associations of mean adipocyte size with body mass index (BMI), glucose, HbA1C, blood lipids as well as mature adipocyte mitochondrial respiration were investigated. RESULTS All adipocyte area estimates derived from adipose tissue histology were not normally distributed, but rather characterized by positive skewness. The shape of the size distribution depends on the adipocyte sizing parameter and on the method used to determine adipocyte size. Despite different distribution shapes histology-derived adipocyte area, diameter, volume, and surface area consistently showed positive correlations with BMI. Furthermore, associations between adipocyte sizing parameters and glucose, HbA1C, or HDL specifically in the visceral adipose depot were revealed. Increasing subcutaneous adipocyte diameter was negatively correlated with adipocyte mitochondrial respiration. CONCLUSIONS Despite different underlying size distributions, the correlation with obesity-related traits was consistent across adipocyte sizing parameters. Decreased mitochondrial respiratory capacity with increasing subcutaneous adipocyte diameter could display a novel link between adipocyte hypertrophy and adipose tissue function.
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21
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Orsso CE, Colin-Ramirez E, Field CJ, Madsen KL, Prado CM, Haqq AM. Adipose Tissue Development and Expansion from the Womb to Adolescence: An Overview. Nutrients 2020; 12:E2735. [PMID: 32911676 PMCID: PMC7551046 DOI: 10.3390/nu12092735] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 08/29/2020] [Accepted: 09/02/2020] [Indexed: 02/07/2023] Open
Abstract
Prevalence rates of pediatric obesity continue to rise worldwide. Adipose tissue (AT) development and expansion initiate in the fetus and extend throughout the lifespan. This paper presents an overview of the AT developmental trajectories from the intrauterine period to adolescence; factors determining adiposity expansion are also discussed. The greatest fetal increases in AT were observed in the third pregnancy trimester, with growing evidence suggesting that maternal health and nutrition, toxin exposure, and genetic defects impact AT development. From birth up to six months, healthy term newborns experience steep increases in AT; but a subsequent reduction in AT is observed during infancy. Important determinants of AT in infancy identified in this review included feeding practices and factors shaping the gut microbiome. Low AT accrual rates are maintained up to puberty onset, at which time, the pattern of adiposity expansion becomes sex dependent. As girls experience rapid increases and boys experience decreases in AT, sexual dimorphism in hormone secretion can be considered the main contributor for changes. Eating patterns/behaviors and interactions between dietary components, gut microbiome, and immune cells also influence AT expansion. Despite the plasticity of this tissue, substantial evidence supports that adiposity at birth and infancy highly influences its levels across subsequent life stages. Thus, a unique window of opportunity for the prevention and/or slowing down of the predisposition toward obesity, exists from pregnancy through childhood.
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Affiliation(s)
- Camila E. Orsso
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2E1, Canada; (C.E.O.); (C.J.F.); (C.M.P.)
| | | | - Catherine J. Field
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2E1, Canada; (C.E.O.); (C.J.F.); (C.M.P.)
| | - Karen L. Madsen
- Department of Medicine, University of Alberta, Edmonton, AB T6G 2C2, Canada;
| | - Carla M. Prado
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2E1, Canada; (C.E.O.); (C.J.F.); (C.M.P.)
| | - Andrea M. Haqq
- Department of Pediatrics and Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2R7, Canada
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22
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Glastonbury CA, Pulit SL, Honecker J, Censin JC, Laber S, Yaghootkar H, Rahmioglu N, Pastel E, Kos K, Pitt A, Hudson M, Nellåker C, Beer NL, Hauner H, Becker CM, Zondervan KT, Frayling TM, Claussnitzer M, Lindgren CM. Machine Learning based histology phenotyping to investigate the epidemiologic and genetic basis of adipocyte morphology and cardiometabolic traits. PLoS Comput Biol 2020; 16:e1008044. [PMID: 32797044 PMCID: PMC7449405 DOI: 10.1371/journal.pcbi.1008044] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 08/26/2020] [Accepted: 06/11/2020] [Indexed: 12/29/2022] Open
Abstract
Genetic studies have recently highlighted the importance of fat distribution, as well as overall adiposity, in the pathogenesis of obesity-associated diseases. Using a large study (n = 1,288) from 4 independent cohorts, we aimed to investigate the relationship between mean adipocyte area and obesity-related traits, and identify genetic factors associated with adipocyte cell size. To perform the first large-scale study of automatic adipocyte phenotyping using both histological and genetic data, we developed a deep learning-based method, the Adipocyte U-Net, to rapidly derive mean adipocyte area estimates from histology images. We validate our method using three state-of-the-art approaches; CellProfiler, Adiposoft and floating adipocytes fractions, all run blindly on two external cohorts. We observe high concordance between our method and the state-of-the-art approaches (Adipocyte U-net vs. CellProfiler: R2visceral = 0.94, P < 2.2 × 10-16, R2subcutaneous = 0.91, P < 2.2 × 10-16), and faster run times (10,000 images: 6mins vs 3.5hrs). We applied the Adipocyte U-Net to 4 cohorts with histology, genetic, and phenotypic data (total N = 820). After meta-analysis, we found that mean adipocyte area positively correlated with body mass index (BMI) (Psubq = 8.13 × 10-69, βsubq = 0.45; Pvisc = 2.5 × 10-55, βvisc = 0.49; average R2 across cohorts = 0.49) and that adipocytes in subcutaneous depots are larger than their visceral counterparts (Pmeta = 9.8 × 10-7). Lastly, we performed the largest GWAS and subsequent meta-analysis of mean adipocyte area and intra-individual adipocyte variation (N = 820). Despite having twice the number of samples than any similar study, we found no genome-wide significant associations, suggesting that larger sample sizes and a homogenous collection of adipose tissue are likely needed to identify robust genetic associations.
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Affiliation(s)
- Craig A. Glastonbury
- Big Data Institute, University of Oxford, Oxford, United Kingdom
- BenevolentAI, London, United Kingdom
| | - Sara L. Pulit
- Big Data Institute, University of Oxford, Oxford, United Kingdom
| | - Julius Honecker
- Else Kröner-Fresenius-Center for Nutritional Medicine, School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Jenny C. Censin
- Big Data Institute, University of Oxford, Oxford, United Kingdom
- Wellcome Centre for Human Genetics (WCHG), Oxford, United Kingdom
| | - Samantha Laber
- Big Data Institute, University of Oxford, Oxford, United Kingdom
- Broad Institute of MIT and Harvard, Cambridge Massachusetts, United States of America
| | - Hanieh Yaghootkar
- Genetics of Complex Traits, University of Exeter Medical School, Royal Devon & Exeter Hospital, Exeter, United Kingdom
- Research Centre for Optimal Health, School of Life Sciences, University of Westminster, London, United Kingdom
| | - Nilufer Rahmioglu
- Wellcome Centre for Human Genetics (WCHG), Oxford, United Kingdom
- Endometriosis CaRe Centre Oxford, Nuffield Department of Women’s and Reproductive Health, University of Oxford, Oxford, United Kingdom
| | - Emilie Pastel
- Genetics of Complex Traits, University of Exeter Medical School, Royal Devon & Exeter Hospital, Exeter, United Kingdom
| | - Katerina Kos
- Genetics of Complex Traits, University of Exeter Medical School, Royal Devon & Exeter Hospital, Exeter, United Kingdom
| | - Andrew Pitt
- NIHR Exeter Clinical Research Facility, University of Exeter Medical School, University of Exeter and Royal Devon and Exeter NHS Foundation Trust Exeter, United Kingdom
| | - Michelle Hudson
- NIHR Exeter Clinical Research Facility, University of Exeter Medical School, University of Exeter and Royal Devon and Exeter NHS Foundation Trust Exeter, United Kingdom
| | - Christoffer Nellåker
- Big Data Institute, University of Oxford, Oxford, United Kingdom
- Endometriosis CaRe Centre Oxford, Nuffield Department of Women’s and Reproductive Health, University of Oxford, Oxford, United Kingdom
| | - Nicola L. Beer
- Novo Nordisk Research Centre Oxford (NNRCO), Oxford, United Kingdom
| | - Hans Hauner
- Else Kröner-Fresenius-Center for Nutritional Medicine, School of Life Sciences, Technical University of Munich, Freising, Germany
- Institute of Nutritional Medicine, School of Medicine, Technical University of Munich, Munich
- German Center of Diabetes Research, Helmholtz Center Munich, Neuherberg, Germany
| | - Christian M. Becker
- Endometriosis CaRe Centre Oxford, Nuffield Department of Women’s and Reproductive Health, University of Oxford, Oxford, United Kingdom
| | - Krina T. Zondervan
- Wellcome Centre for Human Genetics (WCHG), Oxford, United Kingdom
- Endometriosis CaRe Centre Oxford, Nuffield Department of Women’s and Reproductive Health, University of Oxford, Oxford, United Kingdom
| | - Timothy M. Frayling
- Genetics of Complex Traits, University of Exeter Medical School, Royal Devon & Exeter Hospital, Exeter, United Kingdom
- NIHR Exeter Clinical Research Facility, University of Exeter Medical School, University of Exeter and Royal Devon and Exeter NHS Foundation Trust Exeter, United Kingdom
| | - Melina Claussnitzer
- Broad Institute of MIT and Harvard, Cambridge Massachusetts, United States of America
- University of Hohenheim, Stuttgart, Germany
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Cecilia M. Lindgren
- Big Data Institute, University of Oxford, Oxford, United Kingdom
- Wellcome Centre for Human Genetics (WCHG), Oxford, United Kingdom
- Broad Institute of MIT and Harvard, Cambridge Massachusetts, United States of America
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23
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Smith GI, Mittendorfer B, Klein S. Metabolically healthy obesity: facts and fantasies. J Clin Invest 2020; 129:3978-3989. [PMID: 31524630 DOI: 10.1172/jci129186] [Citation(s) in RCA: 326] [Impact Index Per Article: 81.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Although obesity is typically associated with metabolic dysfunction and cardiometabolic diseases, some people with obesity are protected from many of the adverse metabolic effects of excess body fat and are considered "metabolically healthy." However, there is no universally accepted definition of metabolically healthy obesity (MHO). Most studies define MHO as having either 0, 1, or 2 metabolic syndrome components, whereas many others define MHO using the homeostasis model assessment of insulin resistance (HOMA-IR). Therefore, numerous people reported as having MHO are not metabolically healthy, but simply have fewer metabolic abnormalities than those with metabolically unhealthy obesity (MUO). Nonetheless, a small subset of people with obesity have a normal HOMA-IR and no metabolic syndrome components. The mechanism(s) responsible for the divergent effects of obesity on metabolic health is not clear, but studies conducted in rodent models suggest that differences in adipose tissue biology in response to weight gain can cause or prevent systemic metabolic dysfunction. In this article, we review the definition, stability over time, and clinical outcomes of MHO, and discuss the potential factors that could explain differences in metabolic health in people with MHO and MUO - specifically, modifiable lifestyle factors and adipose tissue biology. Better understanding of the factors that distinguish people with MHO and MUO can produce new insights into mechanism(s) responsible for obesity-related metabolic dysfunction and disease.
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24
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Laforest S, Pelletier M, Denver N, Poirier B, Nguyen S, Walker BR, Durocher F, Homer NZM, Diorio C, Andrew R, Tchernof A. Estrogens and Glucocorticoids in Mammary Adipose Tissue: Relationships with Body Mass Index and Breast Cancer Features. J Clin Endocrinol Metab 2020; 105:5680713. [PMID: 31853538 PMCID: PMC7065843 DOI: 10.1210/clinem/dgz268] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 12/17/2019] [Indexed: 12/16/2022]
Abstract
CONTEXT Adipose tissue is an important site for extragonadal steroid hormone biosynthesis through the expression and activity of P450 aromatase, 11β-hydroxysteroid dehydrogenase (HSD) 1, and 17β-HSDs. The contribution of steroid hormones produced by adjacent adipose tissue for the progression and survival of breast tumors is unknown. OBJECTIVE To quantify estrogens (estradiol, estrone) and glucocorticoids (cortisol, cortisone) in breast adipose tissue from both healthy and diseased women and their relationships with adiposity indices and breast cancer prognostic markers. DESIGN AND SETTING Breast adipose tissue was collected at time of surgery. PATIENTS Pre- and postmenopausal women undergoing partial mastectomy for treatment of breast cancer (n = 17) or reduction mammoplasty (n = 6) were studied. INTERVENTIONS Relative estrogen and glucocorticoid amounts were determined by liquid chromatography tandem mass spectrometry. RESULTS The targeted steroids were reliably detected and quantified in mammary adipose tissues. Women with ER+/PR+ tumor had higher relative estradiol amount than women with ER-/PR- tumor (P < .05). The ratio of estradiol-to-estrone was higher in lean women than in women with a body mass index (BMI) ≥ 25 kg/m2 (P < .05). Mixed-model analyses showed that estradiol, cortisone, and cortisol were negatively associated with tumor size (P < .05). Relationships between glucocorticoids and tumor size remained significant after adjustment for BMI. The cortisol-to-cortisone ratio was negatively associated with tumor stage (P < .05) independently of BMI. CONCLUSIONS We reliably quantified estrogens and glucocorticoids in breast adipose tissue from healthy women and women suffering from breast cancer. Our findings suggest that smaller breast tumors are associated with higher relative amounts of estradiol and cortisol in adipose tissue.
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Affiliation(s)
- Sofia Laforest
- CHU de Québec-Université Laval Research Center (Endocrinology and Nephrology division), School of Nutrition, Faculty of Agriculture and Food Sciences, Université Laval, Québec, Canada
- Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, Canada
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen’s Medical Research Institute, Edinburgh, UK
| | - Mélissa Pelletier
- CHU de Québec-Université Laval Research Center (Endocrinology and Nephrology division), School of Nutrition, Faculty of Agriculture and Food Sciences, Université Laval, Québec, Canada
- Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, Canada
| | - Nina Denver
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen’s Medical Research Institute, Edinburgh, UK
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, University Avenue, Glasgow, UK
| | - Brigitte Poirier
- CHU de Québec-Université Laval Research Center (Oncology division), Université Laval Cancer Research Center and Department of Surgery, Faculty of Medicine, Université Laval, Québec, Canada
- Centre des maladies du sein Deschênes-Fabia, Hôpital Saint-Sacrement, Québec, Canada
| | - Sébastien Nguyen
- CHU de Québec-Université Laval Research Center (Oncology division), Université Laval Cancer Research Center and Department of Surgery, Faculty of Medicine, Université Laval, Québec, Canada
| | - Brian R Walker
- University/BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
- Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Francine Durocher
- CHU de Québec-Université Laval Research Center (Endocrinology and Nephrology division), Université Laval Cancer Research Center and Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec, Canada
| | - Natalie Z M Homer
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen’s Medical Research Institute, Edinburgh, UK
- University/BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Caroline Diorio
- Centre des maladies du sein Deschênes-Fabia, Hôpital Saint-Sacrement, Québec, Canada
- CHU de Québec-Université Laval Research Center (Oncology division), Université Laval Cancer Research Center and Department of Social and Preventive Medicine, Faculty of Medicine, Université Laval, Québec, Canada
| | - Ruth Andrew
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen’s Medical Research Institute, Edinburgh, UK
- University/BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - André Tchernof
- CHU de Québec-Université Laval Research Center (Endocrinology and Nephrology division), School of Nutrition, Faculty of Agriculture and Food Sciences, Université Laval, Québec, Canada
- Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, Canada
- Correspondence and Reprint Requests: André Tchernof, PhD, Institut universitaire de cardiologie et de pneumologie de Québec, 2725 Chemin Ste-Foy, Y4212, Québec, QC, Canada G1V 4G5. E-mail:
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25
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Adipocyte size in morbidly obese women and its relation to type 2 diabetes. ACTA MEDICA MARTINIANA 2019. [DOI: 10.2478/acm-2019-0006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Aim of the study: The aim was to perform a morphometric analysis of subcutaneous and visceral adipose tissue of morbidly obese women and to determine the relationship between adipocyte size and the development of type 2 diabetes (T2D).
Materials and methods: White adipose tissue of morbidly obese women was obtained from subcutaneous and omental adipose tissue during bariatric surgery. The same tissues were obtained at judicial autopsy in non-obese (lean) non-diabetic patients. The harvested tissue was embedded in paraffin and 5 μm thick hematoxylin-eosin stained sections were analyzed by the Olympus cellSens system. Statistical evaluation was performed by GraphPad Prism 6.1 software.
Results: We found a relationship between adipocyte size and the presence of T2D. The most pronounced changes were seen in visceral adipocytes (cell diameter increased from 61.9 μm in controls to 79.5 μm in patients with T2D). Also, the size of the subcutaneous adipocytes increased against the control. A statistically significant difference between diabetic and non-diabetic patients was not proven in subcutaneous adipocytes. We also observed differences in the distribution of adipocyte mean diameters. Whilst in the control group there was a normal (Gaussian) distribution, in the morbidly obese we found an asymmetric distribution with a positive skewness to the right.
Conclusion: We have demonstrated that in morbidly obese women a significant increase in visceral adipocyte size is associated with the development of both insulin resistance and T2D.
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26
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Mafra FFP, Macedo MM, Orphão JDNP, Lopes AV, Teixeira CDB, Gattai PP, Torres-Silva R, Nascimento FD, Lopes-Martins RÁB. Laser Photobiomodulation 904 nm Promotes Inhibition of Hormone-Sensitive Lipase Activity in 3T3-L1 Adipocytes Differentiated Cells. PHOTOBIOMODULATION PHOTOMEDICINE AND LASER SURGERY 2019; 37:66-69. [PMID: 31050926 DOI: 10.1089/photob.2018.4515] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Background: The lipid metabolism is essential for maintaining the body's energy responses. Laser photobiomodulation triggers many important cellular effects, but these effects on lipid metabolism are not well described. In this study, we analyzed the laser photobiomodulation in the hormone-sensitive lipase (HSL) activity, a key enzyme in the triglycerides (TAG) hydrolysis in adipose tissue 3T3-L1. Methods: Cells were submitted to the differentiation protocol in adipose cells, irradiated with 1, 2, and 3J with laser (904 nm-60 mw-laser diode) and incubated for 4 h after irradiation. Results: The response of laser photobiomodulation was able to trigger an inhibition of HSL activity (control = 0.057 ± 0.0008; 1J = 0.050 ± 0.0003; 2J = 0.0477 ± 0.002; 3J = 0.051 ± 0.002; p = 0.0003 against the control), but no modulation was observed in TAG levels into the medium (control = 26.5856 ± 0.52; 1J = 26.5856 ± 0.52; 2J = 27.2372 ± 1.41; 3J = 25.9991 ± 0.1303; p = 0.18). Conclusions: This is the first study of HSL activity modulation with laser radiation, suggesting that photobiomodulation can influence adipose tissue metabolism and open a new field of study.
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Affiliation(s)
- Fernando F P Mafra
- 1 Technology Research Center, University of Mogi das Cruzes-UMC , Mogi das Cruzes, Brazil
| | - Michel M Macedo
- 1 Technology Research Center, University of Mogi das Cruzes-UMC , Mogi das Cruzes, Brazil
| | - Juliana do N P Orphão
- 1 Technology Research Center, University of Mogi das Cruzes-UMC , Mogi das Cruzes, Brazil
| | - Arthur Vecchi Lopes
- 1 Technology Research Center, University of Mogi das Cruzes-UMC , Mogi das Cruzes, Brazil
| | | | - Pedro P Gattai
- 2 Molecular Biology Laboratory, Renal Division, Medicine Department, Federal University of São Paulo-UNIFESP , São Paulo, Brazil
| | - Romildo Torres-Silva
- 1 Technology Research Center, University of Mogi das Cruzes-UMC , Mogi das Cruzes, Brazil
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27
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Newman AW, Miller A, Leal Yepes FA, Bitsko E, Nydam D, Mann S. The effect of the transition period and postpartum body weight loss on macrophage infiltrates in bovine subcutaneous adipose tissue. J Dairy Sci 2019; 102:1693-1701. [DOI: 10.3168/jds.2018-15362] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 09/29/2018] [Indexed: 12/27/2022]
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28
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Marchand GB, Carreau AM, Laforest S, Côté JA, Daris M, Cianflone K, Prehn C, Adamski J, Tchernof A. Circulating steroid levels as correlates of adipose tissue phenotype in premenopausal women. Horm Mol Biol Clin Investig 2018; 34:hmbci-2017-0082. [PMID: 29750646 DOI: 10.1515/hmbci-2017-0082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 04/02/2018] [Indexed: 01/10/2023]
Abstract
Background Obesity-related alterations in the circulating steroid hormone profile remain equivocal in women. Our objective was to identify circulating steroid levels that relate to increased adiposity and altered adipose phenotype in premenopausal women. Materials and methods In a sample of 42 premenopausal women [age 46 ± 3 years; body mass index (BMI) 27.1 ± 4.2 kg/m2], 19 plasma steroids were quantified by electrospray ionization-liquid chromatography-tandem mass spectroscopy (ESI-LC-MS/MS). Body composition and fat distribution were assessed by dual-energy X-ray absorptiometry (DXA) and computed tomography (CT), respectively. Markers of adipose tissue function including adipocyte size distributions, radiological attenuation and macrophage infiltration were also analyzed in surgically obtained visceral and subcutaneous fat samples. Results Many negative correlations were observed between adiposity measurements such as BMI, body fat percentage or total abdominal adipose tissue area and plasma levels of androstenedione (Δ4) (r = -0.33 to -0.39, p ≤ 0.04), androsterone (ADT) (r = -0.30 to -0.38, p ≤ 0.05) and steroid precursor pregnenolone (PREG) (r = -0.36 to -0.46, p ≤ 0.02). Visceral adipocyte hypertrophy was observed in patients with low PREG concentrations (p < 0.05). Visceral adipose tissue radiologic attenuation, a potential marker of adipocyte size, was also positively correlated with PREG levels (r = 0.33, p < 0.05). Low levels of PREG were related to increased number of macrophages infiltrating visceral and subcutaneous adipose tissue (p < 0.05). Conclusion Plasma levels of androgens and their precursors are lower in women with increased adiposity and visceral adipocyte hypertrophy. Low circulating PREG concentration may represent a marker of adipose tissue dysfunction.
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Affiliation(s)
- Geneviève B Marchand
- Endocrinology and Nephrology, CHU de Quebec Medical Center, Quebec City, QC, Canada.,School of Nutrition, Laval University, Quebec City, QC, Canada.,Quebec Heart and Lung Institute, Quebec City, QC, Canada
| | - Anne-Marie Carreau
- Quebec Heart and Lung Institute, Quebec City, QC, Canada.,Division of Endocrinology, Department of Medicine, Sherbrooke University, Sherbrooke, QC, Canada
| | - Sofia Laforest
- Endocrinology and Nephrology, CHU de Quebec Medical Center, Quebec City, QC, Canada.,School of Nutrition, Laval University, Quebec City, QC, Canada.,Quebec Heart and Lung Institute, Quebec City, QC, Canada
| | - Julie-Anne Côté
- Endocrinology and Nephrology, CHU de Quebec Medical Center, Quebec City, QC, Canada.,School of Nutrition, Laval University, Quebec City, QC, Canada.,Quebec Heart and Lung Institute, Quebec City, QC, Canada
| | - Marleen Daris
- Endocrinology and Nephrology, CHU de Quebec Medical Center, Quebec City, QC, Canada
| | | | - Cornelia Prehn
- Helmholtz Zentrum München, Institute of Experimental Genetics, Genome Analysis Center, Neuherberg, Oberschleibheim, Germany
| | - Jerzy Adamski
- Helmholtz Zentrum München, Institute of Experimental Genetics, Genome Analysis Center, Neuherberg, Oberschleibheim, Germany.,Lehrstuhl für Experimentelle Genetik, Technische Universität München, Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), München-Neuherberg, Germany
| | - André Tchernof
- Endocrinology and Nephrology, CHU de Quebec Medical Center, Quebec City, QC, Canada.,School of Nutrition, Laval University, Quebec City, QC, Canada.,Quebec Heart and Lung Institute, Laval University, 2725 Chemin Sainte-Foy, Y4212, Quebec, Canada G1V 4G5, Phone: +418-656-8711
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Haczeyni F, Bell-Anderson KS, Farrell GC. Causes and mechanisms of adipocyte enlargement and adipose expansion. Obes Rev 2018; 19:406-420. [PMID: 29243339 DOI: 10.1111/obr.12646] [Citation(s) in RCA: 124] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 09/28/2017] [Accepted: 10/23/2017] [Indexed: 02/06/2023]
Abstract
Adipose tissue plays a significant role in whole body energy homeostasis. Obesity-associated diabetes, fatty liver and metabolic syndrome are closely linked to adipose stress and dysfunction. Genetic predisposition, overeating and physical inactivity influence the expansion of adipose tissues. Under conditions of constant energy surplus, adipocytes become hypertrophic and adipose tissues undergo hyperplasia so as to increase their lipid storage capacity, thereby keeping circulating blood glucose and fatty acids below toxic levels. Nonetheless, adipocytes have a saturation point where they lose capacity to store more lipids. At this stage, when adipocytes are fully lipid-engorged, they express stress signals. Adipose depots (particularly visceral compartments) from obese individuals with a severe metabolic phenotype are characterized by the high proportion of hypertrophic adipocytes. This review focuses on the mechanisms of adipocyte enlargement in relation to adipose fatty acid and cholesterol metabolism, and considers how this may be related to adipose dysfunction.
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Affiliation(s)
- F Haczeyni
- Liver Research Group, Australian National University Medical School at The Canberra Hospital, Canberra, ACT, Australia
| | - K S Bell-Anderson
- Charles Perkins Centre, School of Life and Environmental Sciences, University of Sydney, Sydney, NSW, Australia
| | - G C Farrell
- Liver Research Group, Australian National University Medical School at The Canberra Hospital, Canberra, ACT, Australia
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Laforest S, Pelletier M, Michaud A, Daris M, Descamps J, Soulet D, Jensen MD, Tchernof A. Histomorphometric analyses of human adipose tissues using intact, flash-frozen samples. Histochem Cell Biol 2018; 149:209-218. [DOI: 10.1007/s00418-018-1635-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/12/2018] [Indexed: 12/31/2022]
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Cellular Mechanisms Driving Sex Differences in Adipose Tissue Biology and Body Shape in Humans and Mouse Models. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1043:29-51. [PMID: 29224089 DOI: 10.1007/978-3-319-70178-3_3] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Sex differences in adipose tissue distribution and the metabolic, endocrine, and immune functions of different anatomical fat depots have been described, but they are incompletely documented in the literature. It is becoming increasingly clear that adipose depots serve distinct functions in males and females and have specific physiological roles. However, the mechanisms that regulate the size and function of specific adipose tissues in men and women remain poorly understood. New insights from mouse models have advanced our understanding of depot differences in adipose growth and remodeling via the proliferation and differentiation of adipose progenitors that can expand adipocyte number in the tissue or simply replace dysfunctional older and larger adipocytes. A limited ability of a depot to expand or remodel can lead to excessive adipocyte hypertrophy, which is often correlated with metabolic dysfunction. However, the relationship of adipocyte size and function varies by depot and sex. For example, femoral adipose tissues of premenopausal women appear to have a greater capacity for adipose expansion via hyperplasia and hypertrophy; although larger, these gluteal-femoral adipocytes remain insulin sensitive. The microenvironment of specific depots, including the composition of the extracellular matrix and cellular composition, as well as cell-autonomous genetic differences, influences sex- and depot-dependent metabolic and growth properties. Although there are some species differences, studies of the molecular and physiological determinants of sex differences in adipocyte growth and function in humans and rodents are both needed for understanding sex differences in health and disease.
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Affiliation(s)
- Susan K Fried
- Department of Medicine, Division of Endocrinology, Diabetes and Bone Diseases, Diabetes, Obesity and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
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Relevance of omental pericellular adipose tissue collagen in the pathophysiology of human abdominal obesity and related cardiometabolic risk. Int J Obes (Lond) 2016; 40:1823-1831. [PMID: 27698346 DOI: 10.1038/ijo.2016.173] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 07/29/2016] [Accepted: 09/09/2016] [Indexed: 12/13/2022]
Abstract
BACKGROUND Adipose tissue fibrosis is a relatively new notion and its relationship with visceral obesity and cardiometabolic alterations remains unclear, particularly in moderate obesity. OBJECTIVE Our objective was to examine if total and pericellular collagen accumulation are relevant for the pathophysiology of visceral obesity and related cardiometabolic risk. SUBJECTS AND METHODS Surgical omental (OM) and subcutaneous (SC) fat samples were obtained in 56 women (age: 47.2±5.8 years; body mass index (BMI): 27.1±4.4 kg/m2). Body composition and fat distribution were measured by dual-energy X-ray absorptiometry and computed tomography, respectively. Total and pericellular collagen were measured using picrosirius red staining. CD68+ cells (total macrophages) and CD163+ cells (M2-macrophages) were identified using immunohistochemistry. RESULTS We found that only pericellular collagen percentage, especially in OM fat, was associated with higher BMI, body fat mass and adipose tissue areas as well as lower radiologic attenuation of visceral adipose tissue and altered cardiometabolic risk variables. Strong correlations between peri-adipocyte collagen percentage and total or M2-macrophage percentages were observed in both depots. Total collagen percentage in either compartment was not related to adiposity, fat distribution or cardiometabolic risk. CONCLUSIONS As opposed to whole tissue-based assessments of adipose tissue fibrosis, collagen deposition around the adipocyte, especially in the OM fat compartment is related to total and regional adiposity as well as altered cardiometabolic risk profile.
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