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Signaling pathways in obesity: mechanisms and therapeutic interventions. Signal Transduct Target Ther 2022; 7:298. [PMID: 36031641 PMCID: PMC9420733 DOI: 10.1038/s41392-022-01149-x] [Citation(s) in RCA: 80] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/26/2022] [Accepted: 08/08/2022] [Indexed: 12/19/2022] Open
Abstract
Obesity is a complex, chronic disease and global public health challenge. Characterized by excessive fat accumulation in the body, obesity sharply increases the risk of several diseases, such as type 2 diabetes, cardiovascular disease, and nonalcoholic fatty liver disease, and is linked to lower life expectancy. Although lifestyle intervention (diet and exercise) has remarkable effects on weight management, achieving long-term success at weight loss is extremely challenging, and the prevalence of obesity continues to rise worldwide. Over the past decades, the pathophysiology of obesity has been extensively investigated, and an increasing number of signal transduction pathways have been implicated in obesity, making it possible to fight obesity in a more effective and precise way. In this review, we summarize recent advances in the pathogenesis of obesity from both experimental and clinical studies, focusing on signaling pathways and their roles in the regulation of food intake, glucose homeostasis, adipogenesis, thermogenesis, and chronic inflammation. We also discuss the current anti-obesity drugs, as well as weight loss compounds in clinical trials, that target these signals. The evolving knowledge of signaling transduction may shed light on the future direction of obesity research, as we move into a new era of precision medicine.
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Cordeiro MM, Biscaia PB, Brunoski J, Ribeiro RA, Franco GCN, Scomparin DX. Vitamin D supplementation decreases visceral adiposity and normalizes leptinemia and circulating TNF-α levels in western diet-fed obese rats. Life Sci 2021; 278:119550. [PMID: 33932442 DOI: 10.1016/j.lfs.2021.119550] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/12/2021] [Accepted: 04/20/2021] [Indexed: 11/25/2022]
Abstract
AIMS Vitamin (Vit) D regulates various organic processes, including adipose tissue morphofunction and lipid metabolism. Studies indicate that Vit D bioavailability is reduced in obesity, which could contribute to obesity development; however, the effects of Vit D supplementation on increased adiposity in western diet (WD)-obese rats (an experimental model that better resembles the obesogenic human obesity condition) have not been studied, to date. Thus, we hypothesized that Vit D supplementation following the induction of obesity in WD rats might reduce their body weight (BW) and adiposity. MAIN METHODS Male Wistar rats were fed on a standard chow [control (CTL) group] or a WD to induce obesity (WD group), from 21 to 59 days of age. Subsequently, from 60 to 90-days, half of the CTL and of the WD rats were randomly submitted, or not, to oral Vit D supplementation (CTL-VD and WD-VD groups, respectively). KEY FINDINGS At 91 days of age, WD rats were obese, displaying higher abdominal circumference and white fat stores, dyslipidemia, hyperleptinemia and greater plasma levels of tumor necrosis factor (TNF)-α. Vit D supplementation decreased BW gain, abdominal fat deposition and ameliorated the plasma lipid profile in WD-VD rats. These effects were accompanied by reductions in leptinemia and in circulating TNF-α levels in these rodents. SIGNIFICANCE Vit D supplementation, following the induction of obesity, may represent a good strategy to attenuate BW gain and abdominal adiposity, and ameliorate the plasma lipid profile in WD rats. These effects may be mediated, at least in part, by reductions in circulating levels of leptin and TNF-α.
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Affiliation(s)
- Maiara Mikuska Cordeiro
- Departamento de Biologia Geral, Setor de Ciências Biológicas e da Saúde, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil
| | - Patrícia Bubna Biscaia
- Departamento de Farmácia, Setor de Ciências Biológicas e da Saúde, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil
| | - Janaini Brunoski
- Departamento de Enfermagem e Saúde Pública, Setor de Ciências Biológicas e da Saúde, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil
| | - Rosane Aparecida Ribeiro
- Departamento de Biologia Geral, Setor de Ciências Biológicas e da Saúde, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil
| | - Gilson César Nobre Franco
- Departamento de Biologia Geral, Setor de Ciências Biológicas e da Saúde, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil
| | - Dionizia Xavier Scomparin
- Departamento de Biologia Geral, Setor de Ciências Biológicas e da Saúde, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil.
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Di W, Zhang W, Zhu B, Li X, Tang Q, Zhou Y. Colorectal cancer prompted adipose tissue browning and cancer cachexia through transferring exosomal miR-146b-5p. J Cell Physiol 2021; 236:5399-5410. [PMID: 33368224 DOI: 10.1002/jcp.30245] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 10/23/2020] [Accepted: 12/15/2020] [Indexed: 12/28/2022]
Abstract
Cancer cachexia is a complex syndrome that is associated with thermogenic gene regulation. Currently, although some studies have reported the link between exosomes and cancer cachexia in a few types of cancer, the underlying mechanisms remain poorly understood. In this study, we tried to identify whether exosomes derived from colorectal cancer could affect lipolysis in vitro and in vivo. Here, we collected the tissue samples from 48 patients with colorectal cancer (47.91% females and mean age 55 ± 8.20) and 48 healthy people at the First Affiliated Hospital of Nanjing Medical University to detect the miR-146-5p expression. Here, we found that cancer cells released exosomes induced white adipose tissues (WATs) browning and accelerated lipolysis. We also demonstrated that miR-146b-5p was enriched in cancer-related exosomes. Overexpression miR-146b-5p resulted in increased WAT browning, decreased oxygen consumption, and fat mass loss (14.57%). The further study identified that miR-146b-5p could directly repress the downstream gene homeodomain-containing gene C10 (HOXC10), thereby regulating lipolysis. Therefore, our results indicated that cancer cells derived from exosomal miR-146b-5p played an essential role in WAT browning. Inhibition of cancer-related exosomes might be necessary for improving the cachexia condition.
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Affiliation(s)
- Wenjuan Di
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Wenling Zhang
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Bei Zhu
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Xiaolin Li
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Qiyun Tang
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Yichan Zhou
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
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Stadler JT, Marsche G. Obesity-Related Changes in High-Density Lipoprotein Metabolism and Function. Int J Mol Sci 2020; 21:E8985. [PMID: 33256096 PMCID: PMC7731239 DOI: 10.3390/ijms21238985] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/23/2020] [Accepted: 11/24/2020] [Indexed: 02/07/2023] Open
Abstract
In obese individuals, atherogenic dyslipidemia is a very common and important factor in the increased risk of cardiovascular disease. Adiposity-associated dyslipidemia is characterized by low high-density lipoprotein cholesterol (HDL-C) levels and an increase in triglyceride-rich lipoproteins. Several factors and mechanisms are involved in lowering HDL-C levels in the obese state and HDL quantity and quality is closely related to adiponectin levels and the bioactive lipid sphingosine-1-phosphate. Recent studies have shown that obesity profoundly alters HDL metabolism, resulting in altered HDL subclass distribution, composition, and function. Importantly, weight loss through gastric bypass surgery and Mediterranean diet, especially when enriched with virgin olive oil, is associated with increased HDL-C levels and significantly improved metrics of HDL function. A thorough understanding of the underlying mechanisms is crucial for a better understanding of the impact of obesity on lipoprotein metabolism and for the development of appropriate therapeutic approaches. The objective of this review article was to summarize the newly identified changes in the metabolism, composition, and function of HDL in obesity and to discuss possible pathophysiological consequences.
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Affiliation(s)
- Julia T. Stadler
- Otto Loewi Research Center, Division of Pharmacology, Medical University of Graz, 8010 Graz, Austria
| | - Gunther Marsche
- Otto Loewi Research Center, Division of Pharmacology, Medical University of Graz, 8010 Graz, Austria
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Shen L, Cordero JF, Wang JS, Shen Y, Li S, Liang L, Zou Z, Li C. Association between genetically determined leptin and blood lipids considering alcohol consumption: a Mendelian randomisation study. BMJ Open 2019; 9:e026860. [PMID: 31699712 PMCID: PMC6858149 DOI: 10.1136/bmjopen-2018-026860] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVES The objective of this study was to evaluate the association of genetically determined leptin with lipids. DESIGN We conducted a Mendelian randomisation study to assess a potential causal relationship between serum leptin and lipid levels. We also evaluated whether alcohol drinking modified the associations of genetically determined leptin with blood lipids. SETTING AND PARTICIPANTS 3860 participants of the Framingham Heart Study third generation cohort. RESULTS Both genetic risk scores (GRSs), the GRS generated using leptin loci independent of body mass index (BMI) and GRS generated using leptin loci dependent of BMI, were positively associated with log-transformed leptin (log-leptin). The BMI-independent leptin GRS was associated with log-transformed triglycerides (log-TG, β=-0.66, p=0.01), but not low-density lipoprotein cholesterol (LDL-C, p=0.99), high-density lipoprotein cholesterol (HDL-C, p=0.44) or total cholesterol (TC, p=0.49). Instrumental variable estimation showed that per unit increase in genetically determined log-leptin was associated with 0.55 (95% CI: 0.05 to 1.00) units decrease in log-TG. Besides significant association with log-TG (β=-0.59, p=0.009), the BMI-dependent GRS was nominally associated with HDL-C (β=-10.67, p=0.09) and TC (β=-28.05, p=0.08). When stratified by drinking status, the BMI-dependent GRS was associated with reduced levels of LDL-C (p=0.03), log-TG (p=0.004) and TC (p=0.003) among non-current drinkers only. Significant interactions between the BMI-dependent GRS and alcohol drinking were identified for LDL-C (p=0.03), log-TG (p=0.03) and TC (p=0.02). CONCLUSION These findings together indicated that genetically determined leptin was negatively associated with lipid levels and the association may be modified by alcohol consumption.
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Affiliation(s)
- Luqi Shen
- Department of Epidemiology and Biostatistics, University of Georgia College of Public Health, Athens, Georgia, USA
| | - José F Cordero
- Department of Epidemiology and Biostatistics, University of Georgia College of Public Health, Athens, Georgia, USA
| | - Jia-Sheng Wang
- Department of Environmental Health Science, University of Georgia College of Public Health, Athens, Georgia, USA
| | - Ye Shen
- Department of Epidemiology and Biostatistics, University of Georgia College of Public Health, Athens, Georgia, USA
| | - Shengxu Li
- Children's Minnesota Research Institute, Children's Hospitals and Clinics of Minnesota, Minneapolis, Minnesota, USA
| | - Lirong Liang
- Clinical Epidemiology and Tobacco Dependence Treatment Research Department, Beijing Institute of Respitatory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Zhiyong Zou
- Institute of Child and Adolescent Health, Peking University School of Public Health, Beijing, China
| | - Changwei Li
- Department of Epidemiology and Biostatistics, University of Georgia College of Public Health, Athens, Georgia, USA
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Reijrink M, de Boer SA, Spoor DS, Lefrandt JD, Lambers Heerspink HJ, Boellaard R, Greuter MJ, Borra RJH, Hillebrands JL, Slart RHJA, Mulder DJ. Visceral adipose tissue volume is associated with premature atherosclerosis in early type 2 diabetes mellitus independent of traditional risk factors. Atherosclerosis 2019; 290:87-93. [PMID: 31604171 DOI: 10.1016/j.atherosclerosis.2019.09.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 08/27/2019] [Accepted: 09/25/2019] [Indexed: 11/17/2022]
Abstract
BACKGROUND AND AIMS Type 2 diabetes mellitus (T2DM) is commonly associated with abdominal obesity, predominantly with high visceral adipose tissue (VAT), and is accompanied by premature atherosclerosis. However, the association between VAT and subcutaneous adipose tissue (SAT) with premature atherosclerosis and (i.e. arterial) inflammation is not completely understood. To provide more insight into this association, we investigated the association between arterial 18F-fluordeoxyglucose (FDG) positron emission tomography (PET) uptake, as a measure of arterial inflammation, and metabolic syndrome (MetS) markers in early T2DM patients. METHODS Forty-four patients with early T2DM, without glucose lowering medication, were studied (median age 63 [IQR 54-66] years, median BMI 30.4 [IQR 27.5-35.8]). Arterial inflammation was quantified using glucose corrected maximum standardized uptake value (SUVmax) FDG of the aorta, carotid, iliac, and femoral arteries, and corrected for background activity (blood pool) as target-to-background ratio (meanTBR). VAT and SAT volumes (cm3) were automatically segmented using computed tomography (CT) between levels L1-L5. Non-alcoholic fatty liver disease (NAFLD) was assessed by liver function test and CT. RESULTS VAT volume, but not SAT volume, correlated with meanTBR (r = 0.325, p = 0.031). Linear regression models showed a significant association, even after sequential adjustment for potentially influencing MetS components. Interaction term VAT volume * sex and additional components including HbA1c, insulin resistance, NAFLD, adiponectin, leptin, and C- reactive protein (CRP) did not change the independent association between VAT volume and meanTBR. CONCLUSIONS CT-assessed VAT volume is positively associated with FDG-PET assessed arterial inflammation, independently of factors thought to potentially mediate these effects. These findings suggest that VAT in contrast to SAT is linked to early atherosclerotic changes in T2DM patients.
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Affiliation(s)
- Melanie Reijrink
- University of Groningen, University Medical Center Groningen, Department of Vascular Medicine, Groningen, the Netherlands.
| | - Stefanie A de Boer
- University of Groningen, University Medical Center Groningen, Department of Vascular Medicine, Groningen, the Netherlands
| | - Daan S Spoor
- University of Groningen, University Medical Center Groningen, Medical Imaging Center, Department of Nuclear Medicine and Molecular Imaging, Groningen, the Netherlands
| | - Joop D Lefrandt
- University of Groningen, University Medical Center Groningen, Department of Vascular Medicine, Groningen, the Netherlands
| | - Hiddo J Lambers Heerspink
- University of Groningen, University Medical Center Groningen, Department of Clinical Pharmacy and Pharmacology, Groningen, the Netherlands
| | - Ronald Boellaard
- University of Groningen, University Medical Center Groningen, Medical Imaging Center, Department of Nuclear Medicine and Molecular Imaging, Groningen, the Netherlands; VU University Medical Centre, Amsterdam, Department of Radiology and Nuclear Medicine, the Netherlands
| | - Marcel Jw Greuter
- University of Twente, TechMed Centre, Department of Robotics and Mechatronics, Enschede, the Netherlands; University of Groningen, University Medical Center Groningen, Medical Imaging Center, Department of Radiology, Groningen, the Netherlands
| | - Ronald J H Borra
- University of Groningen, University Medical Center Groningen, Medical Imaging Center, Department of Nuclear Medicine and Molecular Imaging, Groningen, the Netherlands; University of Groningen, University Medical Center Groningen, Medical Imaging Center, Department of Radiology, Groningen, the Netherlands; University of Turku, Turku University Hospital, Medical Imaging Centre of Southwest Finland, Department of Diagnostic Radiology, Turku, Finland
| | - Jan-Luuk Hillebrands
- University of Groningen, University Medical Center Groningen, Department of Pathology and Medical Biology, division of Pathology, Groningen, the Netherlands
| | - Riemer H J A Slart
- University of Groningen, University Medical Center Groningen, Medical Imaging Center, Department of Nuclear Medicine and Molecular Imaging, Groningen, the Netherlands; University of Twente, TechMed Centre, Department of Biomedical Photonic Imaging, Enschede, the Netherlands
| | - Douwe J Mulder
- University of Groningen, University Medical Center Groningen, Department of Vascular Medicine, Groningen, the Netherlands
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Meydan C. Population-based data registries suggest novel insight into malignancy and metabolism. Cancer 2019; 125:15-17. [PMID: 30417327 DOI: 10.1002/cncr.31762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 08/07/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Chanan Meydan
- Department of Internal Medicine, Mayanei Hayeshua Medical Center, Bnei Brak, Israel
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Cernea S, Roiban AL, Both E, Huţanu A. Serum leptin and leptin resistance correlations with NAFLD in patients with type 2 diabetes. Diabetes Metab Res Rev 2018; 34:e3050. [PMID: 30052309 DOI: 10.1002/dmrr.3050] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Revised: 07/08/2018] [Accepted: 07/18/2018] [Indexed: 12/23/2022]
Abstract
AIMS Leptin/leptin resistance has been suggested to play a role in nonalcoholic fatty liver disease (NAFLD), and therefore we investigated the correlation of leptin/leptin-receptor system with markers of hepatic steatosis (HS) and fibrosis (HF) in patients with type 2 diabetes (T2D). MATERIALS AND METHODS In 159 T2D subjects with disease duration of 6.0 (0.0-27.0) years, HS was evaluated by semi-quantitative ultrasonographic scores and by clinical/biochemical variables: Fatty liver index and Hepatic steatosis index. HF was evaluated by NAFLD fibrosis score (NAFLD-FS). Serum leptin and leptin receptor (sObR) concentrations were measured and leptin resistance estimated by Free Leptin Index (FLpI). Both simple and multiple correlations between the HS and HF with the three parameters of interest were examined. RESULTS Leptin levels and FLpI correlated with diabetes duration (0.25 [95%CI: 0.09-0.39] and 0.24 [95%CI: 0.08-0.39]; P < 0.01 for both). 76.1% of T2D patients had HS and 29% had HF. The univariate analysis indicated positive correlations of HS indexes with serum leptin, FLpI, and negative correlations with serum sObR (P < 0.0001 for all). In the multiple regression analysis leptin, sObR, FLpI, waist-to-hip ratio, HbA1c, lipids, and HOMA-IR correlated independently with HS (P < 0.0001 for all). Although the univariate analyses indicated weak correlations of NAFLD-FS with leptin, sObR, and FLpI, in the multiple regression analyses, only age and waist independently predicted HF. CONCLUSION In patients with T2D, HS correlated positively with serum leptin and leptin resistance, and negatively with sObR, along with variables of adiposity and metabolic control, but neither of them made a significant contribution to HF.
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Affiliation(s)
- Simona Cernea
- Department M3/Internal Medicine IV, University of Medicine and Pharmacy of Tîrgu Mureş, Tîrgu Mureş, Romania
- Diabetes, Nutrition, and Metabolic Diseases Outpatient Unit, Emergency County Clinical Hospital Tîrgu Mureş, Tîrgu Mureş, Romania
| | - Andrada Larisa Roiban
- Emergency County Clinical Hospital Tîrgu Mureş, Tîrgu Mureş, Romania
- University of Medicine and Pharmacy of Tîrgu Mureș, Tîrgu Mureş, Romania
| | - Emőke Both
- Emergency County Clinical Hospital Tîrgu Mureş, Tîrgu Mureş, Romania
| | - Adina Huţanu
- Department of Laboratory Medicine, University of Medicine and Pharmacy of Tîrgu Mureș, Tîrgu Mureş, Romania
- Center for Advanced Medical and Pharmaceutical Research, University of Medicine and Pharmacy of Tîrgu Mureș, Tîrgu Mureş, Romania
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Hu W, Lv J, Han M, Yang Z, Li T, Jiang S, Yang Y. STAT3: The art of multi-tasking of metabolic and immune functions in obesity. Prog Lipid Res 2018; 70:17-28. [DOI: 10.1016/j.plipres.2018.04.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 04/04/2018] [Accepted: 04/06/2018] [Indexed: 02/07/2023]
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Hong SJ, Kim SS, Lim W, Song G, Lee CK. Leptin is a dose-dependent marker of caloric restriction in adipose tissues located in different parts of the mouse body. Mol Cell Toxicol 2018. [DOI: 10.1007/s13273-018-0007-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Auclair N, Melbouci L, St-Pierre D, Levy E. Gastrointestinal factors regulating lipid droplet formation in the intestine. Exp Cell Res 2018; 363:1-14. [PMID: 29305172 DOI: 10.1016/j.yexcr.2017.12.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 12/28/2017] [Accepted: 12/29/2017] [Indexed: 12/22/2022]
Abstract
Cytoplasmic lipid droplets (CLD) are considered as neutral lipid reservoirs, which protect cells from lipotoxicity. It became clear that these fascinating dynamic organelles play a role not only in energy storage and metabolism, but also in cellular lipid and protein handling, inter-organelle communication, and signaling among diverse functions. Their dysregulation is associated with multiple disorders, including obesity, liver steatosis and cardiovascular diseases. The central aim of this review is to highlight the link between intra-enterocyte CLD dynamics and the formation of chylomicrons, the main intestinal dietary lipid vehicle, after overviewing the morphology, molecular composition, biogenesis and functions of CLD.
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Affiliation(s)
- N Auclair
- Research Centre, CHU Sainte-Justine and Department of Montreal, Quebec, Canada H3T 1C5; Nutrition, Université de Montréal, Montreal, Quebec, Canada H3T 1C5
| | - L Melbouci
- Research Centre, CHU Sainte-Justine and Department of Montreal, Quebec, Canada H3T 1C5; Department of Sciences and Physical Activities, UQAM, Quebec, Canada H2X 1Y4
| | - D St-Pierre
- Research Centre, CHU Sainte-Justine and Department of Montreal, Quebec, Canada H3T 1C5; Department of Sciences and Physical Activities, UQAM, Quebec, Canada H2X 1Y4
| | - E Levy
- Research Centre, CHU Sainte-Justine and Department of Montreal, Quebec, Canada H3T 1C5; Nutrition, Université de Montréal, Montreal, Quebec, Canada H3T 1C5; Institute of Nutrition and Functional Foods (INAF), Université Laval, Quebec, Quebec, Canada G1V 0A6.
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Ajiboye TO, Hussaini AA, Nafiu BY, Ibitoye OB. Aqueous seed extract of Hunteria umbellata (K. Schum.) Hallier f. (Apocynaceae) palliates hyperglycemia, insulin resistance, dyslipidemia, inflammation and oxidative stress in high-fructose diet-induced metabolic syndrome in rats. JOURNAL OF ETHNOPHARMACOLOGY 2017; 198:184-193. [PMID: 27894971 DOI: 10.1016/j.jep.2016.11.043] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Revised: 11/18/2016] [Accepted: 11/25/2016] [Indexed: 06/06/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Hunteria umbellata is used in the management and treatment of diabetes and obesity in Nigeria. This study evaluates the effect of aqueous seed extract of Hunteria umbellata on insulin resistance, dyslipidemia, inflammation and oxidative stress in high-fructose diet-induced metabolic syndrome MATERIALS AND METHODS: Rats were randomized into seven groups (A-G). Control (group A) and group C rats received control diet for nine weeks while rats in groups B, D - G were placed on high-fructose diet for 9 weeks. In addition to the diets, groups C - F rats orally received 400, 100, 200 and 400mg/kg body weight aqueous seed extract of Hunteria umbellata for 3 weeks starting from 6th - 9th week. RESULTS High-fructose diet (when compared to control rats) mediated a significant (p<0.05) increase in body weight, body mass index and abdominal circumference. Similarly, levels of blood glucose, insulin, leptin, adiponectin and insulin resistance were increased. It also caused a significant increase in the levels of cholesterol, triglycerides, low-density lipoprotein cholesterol, very low-density lipoprotein cholesterol, atherogenic index, cardiac index and coronary artery index while high-density lipoprotein cholesterol was decreased significantly. Levels of proinflammatory factor, tumour necrosis factor-α, interleukin-6 and 8 were also increased by the high fructose diet. Moreover, it mediated decrease in activities of superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glucose 6-phosphate dehydrogenase and level of glutathione reduced. Conversely, levels of malondialdehyde, conjugated dienes, lipid hydroperoxides, protein carbonyl and fragmented DNA were elevated. Aqueous seed extract of Hunteria umbellata significantly ameliorated the high fructose diet-mediated alterations. CONCLUSIONS From this study, it is concluded that aqueous seed extract of Hunteria umbellata possesses hypoglycemic, hypolipidemic and antioxidants abilities as evident from its capability to extenuate insulin resistance, dyslipidemia, inflammation and oxidative stress in high-fructose diet-induced metabolic syndrome rats.
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Affiliation(s)
- T O Ajiboye
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria.
| | - A A Hussaini
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria.
| | - B Y Nafiu
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria.
| | - O B Ibitoye
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria.
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Ajiboye TO, Aliyu H, Tanimu MA, Muhammad RM, Ibitoye OB. Dioscoreophyllum cumminsii (Stapf) Diels leaves halt high-fructose induced metabolic syndrome: Hyperglycemia, insulin resistance, inflammation and oxidative stress. JOURNAL OF ETHNOPHARMACOLOGY 2016; 192:471-479. [PMID: 27568876 DOI: 10.1016/j.jep.2016.08.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2016] [Revised: 08/07/2016] [Accepted: 08/18/2016] [Indexed: 06/06/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Dioscoreophyllum cumminsii is widely used in the management and treatment of diabetes and obesity in Nigeria. This study evaluates the effect of aqueous leaf extract of D. cumminsii on high-fructose diet-induced metabolic syndrome. METHODS Seventy male rats were randomized into seven groups. All rats were fed with high-fructose diet for 9 weeks except groups A and C rats, which received control diet. In addition to the diet treatment, groups A and B rats received distilled water for 3 weeks starting from the seventh week of the experimental period. Rats in groups C-F orally received 400, 100, 200 and 400mg/kg body weight of aqueous leaf extract of D. cumminsii respectively, while group G received 300mg/kg bodyweight of metformin for 3 weeks starting from the seventh week. RESULTS There was significant (p<0.05) reduction in high-fructose diet-mediated increase in body weight, body mass index, abdominal circumference, blood glucose, insulin, leptin and insulin resistance by aqueous leaf extract of D. cumminsii. Conversely, high-fructose diet-mediated decrease in adiponectin was reversed by the extract. Increased levels of cholesterol, triglycerides, low-density lipoprotein cholesterol, very low-density lipoprotein cholesterol, atherogenic index, cardiac index and coronary artery index were significantly lowered by the extract, while high-fructose diet mediated decrease in high-density lipoprotein cholesterol was increased by the extract. Tumour necrosis factor-α, interleukin-6 and interleukin-8 levels increased significantly in high-fructose diet-fed rats, which were significantly reversed by the extract. High-fructose mediated-decrease in superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glucose 6-phosphate dehydrogenase and glutathione reduced were significantly reversed by aqueous leaf extract of D. cumminsii. Conversely, elevated levels of malondialdehyde, conjugated dienes, lipid hydroperoxides, protein carbonyl and fragmented DNA were significantly lowered by the extract. CONCLUSION Data generated in this study further laid credence to the hypoglycemic activity of aqueous leaf extract of D. cumminsii as evident from the reversal of hyperglycemia, insulin resistance, dyslipidemia, inflammation and oxidative stress in high-fructose diet-induced metabolic syndrome rats.
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Affiliation(s)
- T O Ajiboye
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria.
| | - H Aliyu
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria
| | - M A Tanimu
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria
| | - R M Muhammad
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria
| | - O B Ibitoye
- Antioxidants, Free Radicals, Functional Foods and Toxicology Research Laboratory, Department of Biological Sciences, Al-Hikmah University, Ilorin, Nigeria
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14
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Gurzov EN, Stanley WJ, Pappas EG, Thomas HE, Gough DJ. The JAK/STAT pathway in obesity and diabetes. FEBS J 2016; 283:3002-15. [PMID: 26972840 DOI: 10.1111/febs.13709] [Citation(s) in RCA: 166] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 02/14/2016] [Accepted: 03/08/2016] [Indexed: 12/12/2022]
Abstract
Diabetes mellitus are complex, multi-organ metabolic pathologies characterized by hyperglycemia. Emerging evidence shows that the highly conserved and potent JAK/STAT signaling pathway is required for normal homeostasis, and, when dysregulated, contributes to the development of obesity and diabetes. In this review, we analyze the role of JAK/STAT activation in the brain, liver, muscle, fat and pancreas, and how this affects the course of the disease. We also consider the therapeutic implications of targeting the JAK/STAT pathway in treatment of obesity and diabetes.
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Affiliation(s)
- Esteban N Gurzov
- St Vincent's Institute of Medical Research, Fitzroy, Australia.,Department of Medicine, St. Vincent's Hospital, The University of Melbourne, Fitzroy, Australia
| | - William J Stanley
- St Vincent's Institute of Medical Research, Fitzroy, Australia.,Department of Medicine, St. Vincent's Hospital, The University of Melbourne, Fitzroy, Australia
| | - Evan G Pappas
- St Vincent's Institute of Medical Research, Fitzroy, Australia.,Department of Medicine, St. Vincent's Hospital, The University of Melbourne, Fitzroy, Australia
| | - Helen E Thomas
- St Vincent's Institute of Medical Research, Fitzroy, Australia.,Department of Medicine, St. Vincent's Hospital, The University of Melbourne, Fitzroy, Australia
| | - Daniel J Gough
- Hudson Institute of Medical Research, Clayton, Australia.,Department of Molecular and Translational Science, Monash University, Clayton, Australia
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15
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Solis-Paredes M, Espino y Sosa S, Estrada-Gutierrez G, Nava-Salazar S, Ortega-Castillo V, Rodriguez-Bosch M, Bravo-Flores E, Espejel-Nuñez A, Tolentino-Dolores M, Gaona-Estudillo R, Martinez-Bautista N, Perichart-Perera O. Maternal and Fetal Lipid and Adipokine Profiles and Their Association with Obesity. Int J Endocrinol 2016; 2016:7015626. [PMID: 27190514 PMCID: PMC4844894 DOI: 10.1155/2016/7015626] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 02/25/2016] [Accepted: 03/08/2016] [Indexed: 02/06/2023] Open
Abstract
Background. Maternal metabolic changes impact fetal metabolism resulting in a higher risk for developing chronic diseases later in life. The aim of this study was to assess the association between maternal and fetal adipokine and lipid profiles, as well as the influence of maternal weight on this association. Methods. Healthy pregnant women at term who delivered by C-section were enrolled. Maternal and fetal glucose, lipid profile, adiponectin, leptin, and resistin levels were analyzed by obesity and maternal weight gain. Statistics included descriptives, correlations, and mean differences (SPSS v20.0). Results. Adiponectin and resistin concentrations were higher in fetal blood, while leptin was lower (p < 0.05). A significant inverse association between maternal resistin and fetal LDL-cholesterol (LDL-C) (r = -0.327; p = 0.022) was observed. A positive correlation was found between maternal and fetal resistin (r = 0.358; p = 0.013). Women with excessive weight gain had higher leptin levels and their fetuses showed higher LDL-C levels (p < 0.05). Conclusions. Maternal resistin showed an inverse association with fetal LDL-C, suggesting that maternal adiposity status may play an active role in the regulation of fetal lipid profile and consequently, in fetal programming. Excessive maternal weight gain during pregnancy may exert an effect over metabolic mediators in both mother and newborn.
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Affiliation(s)
- Mario Solis-Paredes
- Department of Immunobiochemistry, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
- Posgrado en Ciencias Quimico-Biologicas, Escuela Nacional de Ciencias Biologicas, Instituto Politecnico Nacional, 11340 Ciudad de México, DF, Mexico
| | - Salvador Espino y Sosa
- Direction of Education, Instituto Nacional de Medicina Genomica, 14610 Ciudad de México, DF, Mexico
| | - Guadalupe Estrada-Gutierrez
- Biomedical Research Branch, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
| | - Sonia Nava-Salazar
- Department of Immunobiochemistry, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
| | - Veronica Ortega-Castillo
- Department of Obstetrics, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
| | - Mario Rodriguez-Bosch
- Department of Obstetrics, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
| | - Eyerahi Bravo-Flores
- Department of Immunobiochemistry, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
| | - Aurora Espejel-Nuñez
- Department of Immunobiochemistry, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
| | - Maricruz Tolentino-Dolores
- Department of Nutrition and Bioprogramming, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
| | - Rubí Gaona-Estudillo
- Department of Immunobiochemistry, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
| | - Nancy Martinez-Bautista
- Immunology Department, Centro Medico Nacional La Raza, Instituto Mexicano del Seguro Social, 02990 Ciudad de México, DF, Mexico
| | - Otilia Perichart-Perera
- Department of Nutrition and Bioprogramming, Instituto Nacional de Perinatologia Isidro Espinosa de los Reyes, 11000 Ciudad de México, DF, Mexico
- *Otilia Perichart-Perera:
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16
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Differential effects of leptin on adiponectin expression with weight gain versus obesity. Int J Obes (Lond) 2015; 40:266-74. [PMID: 26374448 PMCID: PMC4747836 DOI: 10.1038/ijo.2015.181] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 08/12/2015] [Accepted: 08/19/2015] [Indexed: 12/15/2022]
Abstract
Background/Objective Adiponectin exerts beneficial effects by reducing inflammation, and improving lipid metabolism and insulin-sensitivity. Although adiponectin is lower in obese individuals, whether weight gain reduces adiponectin expression in humans is controversial. We sought to investigate the role of weight gain, and consequent changes in leptin, on altering adiponectin expression in humans. Methods/Results Forty four normal-weight healthy subjects were recruited (mean age 29 years; 14 women) and randomized to either gain 5% of body weight by 8-weeks of overfeeding (n=34) or maintain weight (n=10). Modest weight gain of 3.8 ± 1.2 kg resulted in increased adiponectin (p=0.03) while weight maintenance resulted in no changes in adiponectin. Further, changes in adiponectin correlated positively with changes in leptin (p=0.0085). In-vitro experiments using differentiated human white preadipocytes showed that leptin increased adiponectin mRNA and protein expression, while a leptin-antagonist had opposite effects. To understand the role of leptin in established obesity, we compared adipose tissue samples obtained from normal weight versus obese subjects. We noted, first, that leptin activated cellular signaling pathways and increased adiponectin mRNA in adipose tissue from normal-weight participants, but did not do so in adipose tissue from obese participants; and second, that obese subjects had increased caveolin-1 expression, which attenuates leptin-dependent increases in adiponectin. Conclusions Modest weight gain in healthy individuals is associated with increases in adiponectin, which correlate positively with changes in leptin. In-vitro, leptin induces adiponectin expression which is attenuated by increased caveolin-1 expression. Additionally, adipose tissue from obese subjects shows increased caveolin-1 expression, and impaired leptin signaling. This leptin signal impairment may prevent concordant increases in adiponectin in obese subjects despite their high levels of leptin. Therefore, impaired leptin signaling may contribute to low adiponectin expression in obesity and may provide a target for increasing adiponectin expression, hence improving insulin sensitivity and cardio-metabolic profile in obesity.
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17
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Guennoun A, Kazantzis M, Thomas R, Wabitsch M, Tews D, Seetharama Sastry K, Abdelkarim M, Zilberfarb V, Strosberg AD, Chouchane L. Comprehensive molecular characterization of human adipocytes reveals a transient brown phenotype. J Transl Med 2015; 13:135. [PMID: 25925588 PMCID: PMC4438513 DOI: 10.1186/s12967-015-0480-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 03/31/2015] [Indexed: 12/30/2022] Open
Abstract
Background Functional brown adipose tissue (BAT), involved in energy expenditure, has recently been detected in substantial amounts in adults. Formerly overlooked BAT has now become an attractive anti-obesity target. Methods and results Molecular characterization of human brown and white adipocytes, using a myriad of techniques including high-throughput RNA sequencing and functional assays, showed that PAZ6 and SW872 cells exhibit classical molecular and phenotypic markers of brown and white adipocytes, respectively. However, the pre-adipocyte cell line SGBS presents a versatile phenotype. A transit expression of classical brown markers such as UCP1 and PPARγ peaked and declined at day 28 post-differentiation initiation. Conversely, white adipocyte markers, including Tcf21, showed reciprocal behavior. Interestingly, leptin levels peaked at day 28 whereas the highest adiponectin mRNA levels were detected at day 14 of differentiation. Phenotypic analysis of the abundance and shape of lipid droplets were consistent with the molecular patterns. Accordingly, the oxidative capacity of SGBS adipocytes peaked on differentiation day 14 and declined progressively towards differentiation day 28. Conclusions Our studies have unveiled a new phenotype of human adipocytes, providing a tool to identify molecular gene expression patterns and pathways involved in the conversion between white and brown adipocytes. Electronic supplementary material The online version of this article (doi:10.1186/s12967-015-0480-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Andrea Guennoun
- Laboratory of Genetic Medicine & Immunology, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar.
| | - Melissa Kazantzis
- Center for Diabetes and Metabolic Diseases, The Scripps Research Institute, Florida, USA.
| | - Remy Thomas
- Laboratory of Genetic Medicine & Immunology, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar.
| | - Martin Wabitsch
- Department of Paediatrics and Adolescent Medicine, Division of Pediatric Endocrinology and Diabetology, Ulm, Germany.
| | - Daniel Tews
- Department of Paediatrics and Adolescent Medicine, Division of Pediatric Endocrinology and Diabetology, Ulm, Germany.
| | - Konduru Seetharama Sastry
- Laboratory of Genetic Medicine & Immunology, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar.
| | | | - Vladimir Zilberfarb
- Institut Cochin INSERM U1016, Université Paris 7-Denis-Diderot, Paris, France.
| | | | - Lotfi Chouchane
- Laboratory of Genetic Medicine & Immunology, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar.
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18
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Zhao J, Fan B, Wu Z, Xu M, Luo Y. Serum zinc is associated with plasma leptin and Cu-Zn SOD in elite male basketball athletes. J Trace Elem Med Biol 2015; 30:49-53. [PMID: 25434301 DOI: 10.1016/j.jtemb.2014.10.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 10/10/2014] [Accepted: 10/15/2014] [Indexed: 01/10/2023]
Abstract
This paper investigates the relationship between plasma trace element and plasma leptin, as well as percent fat mass, in 16 male basketball athletes. Blood samples were obtained before intensive training and 24h after intensive training to measure plasma zinc (Zn), copper (Cu), calcium (Ca), magnesium (Mg), iron (Fe), and leptin levels. High-density lipoprotein cholesterol (HDL), low-density lipoprotein cholesterol (LDL), triglyceride (TG), total and cholesterol (TC) levels were determined using commercially available kits for humans. Subjects presented similar values in terms of age (21.1±2.2 years old), body mass index (23.9±2.00kg/m(2)), percent body fat (14.40±1.52%), plasma hemoglobin (150.1±9.4g/L), plasma Zn (17.47±1.28μmol/l), plasma Cu (13.42±1.40μmol/L), plasma Ca (2.41±0.14mmol/L), and plasma Mg (0.96±0.02mmol/L). The correlation analysis between degree of plasma leptin and plasma element contents was performed using the SPSS 16.0 software. Plasma Zn correlated positively with plasma leptin (r=0.746, P<0.01), Cu-Zn SOD (r=0.827, P<0.01), and negatively with percent fat mass (r=-0.598, P<0.05) under no-training conditions. Meanwhile, plasma Cu, Ca, Mg, and Fe did not correlate with plasma leptin or percent fat mass (P>0.05). In conclusion, plasma Zn may be involved in the regulation of plasma leptin and may serve as a lipid-mobilizing factor in Chinese men's basketball athletes.
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Affiliation(s)
- Jiexiu Zhao
- Sport Biological Center, China Institute of Sport Science, General Administration of Sport, Beijing, China.
| | - Bin Fan
- Chinese Men's Basketball Team, Beijing, China
| | - Zhaozhao Wu
- Sport Biological Center, China Institute of Sport Science, General Administration of Sport, Beijing, China
| | - Minxiao Xu
- Physical Education Department, Qufu Normal University, Qufu, China; Sport Biological Center, China Institute of Sport Science, General Administration of Sport, Beijing, China
| | - Yufeng Luo
- Sport Biological Center, China Institute of Sport Science, General Administration of Sport, Beijing, China
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19
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Wang Y, Lin HQ, Law WK, Liang WC, Zhang JF, Hu JS, Ip TM, Waye MMY, Wan DCC. Pimozide, a novel fatty acid binding protein 4 inhibitor, promotes adipogenesis of 3T3-L1 cells by activating PPARγ. ACS Chem Neurosci 2015; 6:211-8. [PMID: 25437245 DOI: 10.1021/cn5002107] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Pimozide is a conventional antipsychotic of the diphenylbutylpiperidine class that has been clinically used for over 30 years. The obvious side effect of this drug is weight gain. However, the mechanism of pimozide-induced weight gain is still unknown. In the present study, we identified pimozide as a novel fatty acid binding protein 4 (FABP4) inhibitor using molecular docking simulation as well as biochemical characterizations. BMS309403, a well-known FABP4 inhibitor, elevated the basal protein levels of PPARγ, therefore stimulating adipogenesis in adipocytes. The present study showed that the inhibitory effect of pimozide on FABP4 promoted adipocyte differentiation with the potency proportional to their propensities for weight gain. These effects in adipogenesis by pimozide may help to explain the weight gain that is frequently observed in patients treated with pimozide.
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Affiliation(s)
- Yan Wang
- School
of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Huang-Quan Lin
- Division
of Life Science and Center for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong
Kong SAR, China
| | - Wai-Kit Law
- School
of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Wei-Cheng Liang
- School
of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
- Department
of Orthopaedics and Traumatology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Jin-Fang Zhang
- School
of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
- Department
of Orthopaedics and Traumatology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Jian-Shu Hu
- School
of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Tsz-Ming Ip
- School
of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Mary Miu-Yee Waye
- School
of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - David Chi-Cheong Wan
- School
of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
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20
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Martins LM, Oliveira ARS, Cruz KJC, Torres-Leal FL, Marreiro DDN. Obesity, inflammation, and insulin resistance. BRAZ J PHARM SCI 2014. [DOI: 10.1590/s1984-82502014000400003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
White adipose tissue (WAT) is considered an endocrine organ. When present in excess, WAT can influence metabolism via biologically active molecules. Following unregulated production of such molecules, adipose tissue dysfunction results, contributing to complications associated with obesity. Previous studies have implicated pro- and anti-inflammatory substances in the regulation of inflammatory response and in the development of insulin resistance. In obese individuals, pro-inflammatory molecules produced by adipose tissue contribute to the development of insulin resistance and increased risk of cardiovascular disease. On the other hand, the molecules with anti-inflammatory action, that have been associated with the improvement of insulin sensitivity, have your decreased production. Imbalance of these substances contributes significantly to metabolic disorders found in obese individuals. The current review aims to provide updated information regarding the activity of biomolecules produced by WAT.
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21
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Méndez-Giménez L, Rodríguez A, Balaguer I, Frühbeck G. Role of aquaglyceroporins and caveolins in energy and metabolic homeostasis. Mol Cell Endocrinol 2014; 397:78-92. [PMID: 25008241 DOI: 10.1016/j.mce.2014.06.017] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 06/25/2014] [Accepted: 06/26/2014] [Indexed: 12/23/2022]
Abstract
Aquaglyceroporins and caveolins are submicroscopic integral membrane proteins that are particularly abundant in many mammalian cells. Aquaglyceroporins (AQP3, AQP7, AQP9 and AQP10) encompass a subfamily of aquaporins that allow the movement of water, but also of small solutes, such as glycerol, across cell membranes. Glycerol constitutes an important metabolite as a substrate for de novo synthesis of triacylglycerols and glucose as well as an energy substrate to produce ATP via the mitochondrial oxidative phosphorylation. In this sense, the control of glycerol influx/efflux in metabolic organs by aquaglyceroporins plays a crucial role with the dysregulation of these glycerol channels being associated with metabolic diseases, such as obesity, insulin resistance, non-alcoholic fatty liver disease and cardiac hypertrophy. On the other hand, caveolae have emerged as relevant plasma membrane sensors implicated in a wide range of cellular functions, including endocytosis, apoptosis, cholesterol homeostasis, proliferation and signal transduction. Caveolae-coating proteins, namely caveolins and cavins, can act as scaffolding proteins within caveolae by concentrating signaling molecules involved in free fatty acid and cholesterol uptake, proliferation, insulin signaling or vasorelaxation, among others. The importance of caveolae in whole-body homeostasis is highlighted by the link between homozygous mutations in genes encoding caveolins and cavins with metabolic diseases, such as lipodystrophy, dyslipidemia, muscular dystrophy and insulin resistance in rodents and humans. The present review focuses on the role of aquaglyceroporins and caveolins on lipid and glucose metabolism, insulin secretion and signaling, energy production and cardiovascular homeostasis, outlining their potential relevance in the development and treatment of metabolic diseases.
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Affiliation(s)
- Leire Méndez-Giménez
- Metabolic Research Laboratory, Clínica Universidad de Navarra, Pamplona, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Pamplona, Spain
| | - Amaia Rodríguez
- Metabolic Research Laboratory, Clínica Universidad de Navarra, Pamplona, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Pamplona, Spain.
| | - Inmaculada Balaguer
- Metabolic Research Laboratory, Clínica Universidad de Navarra, Pamplona, Spain
| | - Gema Frühbeck
- Metabolic Research Laboratory, Clínica Universidad de Navarra, Pamplona, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Pamplona, Spain; Department of Endocrinology and Nutrition, Clínica Universidad de Navarra, Pamplona, Spain.
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22
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Mathew R. Pulmonary hypertension and metabolic syndrome: Possible connection, PPARγ and Caveolin-1. World J Cardiol 2014; 6:692-705. [PMID: 25228949 PMCID: PMC4163699 DOI: 10.4330/wjc.v6.i8.692] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 04/29/2014] [Accepted: 06/27/2014] [Indexed: 02/06/2023] Open
Abstract
A number of disparate diseases can lead to pulmonary hypertension (PH), a serious disorder with a high morbidity and mortality rate. Recent studies suggest that the associated metabolic dysregulation may be an important factor adversely impacting the prognosis of PH. Furthermore, metabolic syndrome is associated with vascular diseases including PH. Inflammation plays a significant role both in PH and metabolic syndrome. Adipose tissue modulates lipid and glucose metabolism, and also produces pro- and anti-inflammatory adipokines that modulate vascular function and angiogenesis, suggesting a close functional relationship between the adipose tissue and the vasculature. Both caveolin-1, a cell membrane scaffolding protein and peroxisome proliferator-activated receptor (PPAR) γ, a ligand-activated transcription factor are abundantly expressed in the endothelial cells and adipocytes. Both caveolin-1 and PPARγ modulate proliferative and anti-apoptotic pathways, cell migration, inflammation, vascular homeostasis, and participate in lipid transport, triacylglyceride synthesis and glucose metabolism. Caveolin-1 and PPARγ regulate the production of adipokines and in turn are modulated by them. This review article summarizes the roles and inter-relationships of caveolin-1, PPARγ and adipokines in PH and metabolic syndrome.
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23
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Palacios-Ortega S, Varela-Guruceaga M, Milagro FI, Martínez JA, de Miguel C. Expression of Caveolin 1 is enhanced by DNA demethylation during adipocyte differentiation. status of insulin signaling. PLoS One 2014; 9:e95100. [PMID: 24751908 PMCID: PMC3994010 DOI: 10.1371/journal.pone.0095100] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Accepted: 03/23/2014] [Indexed: 12/14/2022] Open
Abstract
Caveolin 1 (Cav-1) is an essential constituent of adipocyte caveolae which binds the beta subunit of the insulin receptor (IR) and is implicated in the regulation of insulin signaling. We have found that, during adipocyte differentiation of 3T3-L1 cells the promoter, exon 1 and first intron of the Cav-1 gene undergo a demethylation process that is accompanied by a strong induction of Cav-1 expression, indicating that epigenetic mechanisms must have a pivotal role in this differentiation process. Furthermore, IR, PKB-Akt and Glut-4 expression are also increased during the differentiation process suggesting a coordinated regulation with Cav-1. Activation of Cav-1 protein by phosphorylation arises during the differentiation process, yet in fully mature adipocytes insulin is no longer able to significantly increase Cav-1 phosphorylation. However, these long-term differentiated cells are still able to respond adequately to insulin, increasing IR and PKB-Akt phosphorylation and glucose uptake. The activation of Cav-1 during the adipocyte differentiation process could facilitate the maintenance of insulin sensitivity by these fully mature adipocytes isolated from additional external stimuli. However, under the influence of physiological conditions associated to obesity, such as chronic inflammation and hypoxia, insulin sensitivity would finally be compromised.
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Affiliation(s)
| | | | - Fermín Ignacio Milagro
- Department of Nutrition Food Science and Physiology, University of Navarra, Pamplona, Spain
- Physiopathology of Obesity and Nutrition CIBERobn, Carlos III Health Research Institute, Madrid, Spain
| | - José Alfredo Martínez
- Department of Nutrition Food Science and Physiology, University of Navarra, Pamplona, Spain
- Physiopathology of Obesity and Nutrition CIBERobn, Carlos III Health Research Institute, Madrid, Spain
| | - Carlos de Miguel
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain
- Physiopathology of Obesity and Nutrition CIBERobn, Carlos III Health Research Institute, Madrid, Spain
- * E-mail:
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Kim WS, Han J, Hwang SJ, Sung JH. An update on niche composition, signaling and functional regulation of the adipose-derived stem cells. Expert Opin Biol Ther 2014; 14:1091-102. [DOI: 10.1517/14712598.2014.907785] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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25
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Circulation Research
Thematic Synopsis Diabetes and Obesity. Circ Res 2013; 113:e62-75. [DOI: 10.1161/circresaha.113.302431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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van der Wijden CL, Delemarre-van der Waal HA, van Mechelen W, van Poppel MNM. The concurrent validity between leptin, BMI and skin folds during pregnancy and the year after. Nutr Diabetes 2013; 3:e86. [PMID: 24018614 PMCID: PMC3789130 DOI: 10.1038/nutd.2013.27] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2013] [Revised: 06/27/2013] [Accepted: 07/24/2013] [Indexed: 12/11/2022] Open
Abstract
Background: From a public health perspective it is important to know which of the currently used methods to estimate changes in maternal body fat during pregnancy and the year thereafter is the most adequate. Objectives: To evaluate the concurrent validity between leptin and surrogates of fat measures: body mass index (BMI) and the sum of four skin folds. Design: Data from the New Life(style) intervention study were analysed as a cohort study. Setting: Midwife practices in The Netherlands. Population: Healthy pregnant nulliparous women. Methods: Anthropometric measurements were done and blood was collected at 15, 25 and 35 weeks of pregnancy and at 6, 26 and 52 weeks after delivery. Data were used if at least 4 out of the 6 measurements were available, leaving 87 women in the analyses. Spearman's correlation coefficients between leptin and BMI and between leptin and the sum of skin folds were calculated for each time point and for the changes between the time points. Results: Correlations between leptin and BMI varied from 0.69 to 0.81. Correlations between leptin and the sum of skin folds were comparable, varying between 0.65 and 0.81. Correlations between changes in leptin and changes in BMI and the sum of skin folds, respectively, were much lower compared with cross-sectional correlations. Conclusion: Because of the high correlation among the three methods and because of the overlapping intervals, all methods seem to be equally adequate to estimate changes in maternal body fat during pregnancy and the year thereafter.
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Affiliation(s)
- C L van der Wijden
- 1] Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands [2] Department of Gynaecology, Medisch Centrum Jan van Goyen, Amsterdam, The Netherlands
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Schroeter MR, Leifheit-Nestler M, Hubert A, Schumann B, Glückermann R, Eschholz N, Krüger N, Lutz S, Hasenfuss G, Konstantinides S, Schäfer K. Leptin promotes neointima formation and smooth muscle cell proliferation via NADPH oxidase activation and signalling in caveolin-rich microdomains. Cardiovasc Res 2013; 99:555-65. [PMID: 23723060 DOI: 10.1093/cvr/cvt126] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
AIMS Apolipoprotein E (apoE) may act as a vasculoprotective factor by promoting plasma lipid clearance and cholesterol efflux. Moreover, apoE accumulates at sites of vascular injury and modulates the effect of growth factors on smooth muscle cells (SMCs). Experimental data suggested that hypothalamic apoE expression is reduced in obesity and associated with leptin resistance. In this study, we examined the role of apoE in mediating the effects of leptin on vascular lesion formation. METHODS AND RESULTS Leptin was administered to apoE knockout (apoE-/-) mice via osmotic pumps to increase its circulating levels. Morphometric analysis revealed that leptin did not alter neointima formation and failed to increase α-actin- or PCNA-immunopositive SMCs after vascular injury. Similar findings were obtained after analysis of atherosclerotic lesions. Comparison of apoE-/-, wild-type, or LDL receptor-/- mice and functional analyses in aortic SMCs from WT or apoE-/- mice or human arterial SMCs after treatment with small interfering (si)RNA or heparinase revealed that leptin requires the presence of apoE, expressed, secreted and bound to the cell surface, to fully activate leptin receptor signalling and to promote SMC proliferation and neointima formation. Mechanistically, leptin induced the phosphorylation and membrane translocation of caveolin (cav)-1, and apoE down-regulation or caveolae disruption inhibited the leptin-induced p47phox activation, ROS formation and SMC proliferation. Finally, leptin failed to increase neointima formation in mice lacking cav-1. CONCLUSION Our findings suggest that apoE mediates the effects of leptin on vascular lesion formation by stabilizing cav-1-enriched cell membrane microdomains in SMCs, thus allowing NADPH oxidase assembly and ROS-mediated mitogenic signalling.
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Affiliation(s)
- Marco R Schroeter
- Department of Cardiology and Pulmonary Medicine, University Medical Center Göttingen, Robert Koch Strasse 40, Göttingen D-37075, Germany
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