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Ng MY, Song ZJ, Venkatesan G, Rodriguez-Cuenca S, West JA, Yang S, Tan CH, Ho PCL, Griffin JL, Vidal-Puig A, Bassetto M, Hagen T. Conjugating uncoupler compounds with hydrophobic hydrocarbon chains to achieve adipose tissue selective drug accumulation. Sci Rep 2024; 14:4932. [PMID: 38418847 PMCID: PMC10901892 DOI: 10.1038/s41598-024-54466-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 02/13/2024] [Indexed: 03/02/2024] Open
Abstract
One potential approach for treating obesity is to increase energy expenditure in brown and white adipose tissue. Here we aimed to achieve this outcome by targeting mitochondrial uncoupler compounds selectively to adipose tissue, thus avoiding side effects from uncoupling in other tissues. Selective drug accumulation in adipose tissue has been observed with many lipophilic compounds and dyes. Hence, we explored the feasibility of conjugating uncoupler compounds with a lipophilic C8-hydrocarbon chain via an ether bond. We found that substituting the trifluoromethoxy group in the uncoupler FCCP with a C8-hydrocarbon chain resulted in potent uncoupling activity. Nonetheless, the compound did not elicit therapeutic effects in mice, likely as a consequence of metabolic instability resulting from rapid ether bond cleavage. A lipophilic analog of the uncoupler compound 2,6-dinitrophenol, in which a C8-hydrocarbon chain was conjugated via an ether bond in the para-position (2,6-dinitro-4-(octyloxy)phenol), exhibited increased uncoupling activity compared to the parent compound. However, in vivo pharmacokinetics studies suggested that 2,6-dinitro-4-(octyloxy)phenol was also metabolically unstable. In conclusion, conjugation of a hydrophobic hydrocarbon chain to uncoupler compounds resulted in sustained or improved uncoupling activity. However, an ether bond linkage led to metabolic instability, indicating the need to conjugate lipophilic groups via other chemical bonds.
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Affiliation(s)
- Mei Ying Ng
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Zhi Jian Song
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore, Singapore
| | | | - Sergio Rodriguez-Cuenca
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, The University of Cambridge, Cambridge, UK
| | - James A West
- Department of Biochemistry, The University of Cambridge, Cambridge, UK
| | - Shili Yang
- Department of Pharmacy, Faculty of Science, National University of Singapore, Singapore, Singapore
| | - Choon Hong Tan
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore, Singapore
| | - Paul Chi-Lui Ho
- Department of Pharmacy, Faculty of Science, National University of Singapore, Singapore, Singapore
- School of Pharmacy, Monash University Malaysia, 47500, Subang Jaya, Malaysia
| | - Julian L Griffin
- The Rowett Institute of Nutrition and Health, The University of Aberdeen, Aberdeen, UK
| | - Antonio Vidal-Puig
- Wellcome-MRC Institute of Metabolic Science and Medical Research Council Metabolic Diseases Unit, The University of Cambridge, Cambridge, UK
| | - Marcella Bassetto
- School of Pharmacy and Pharmaceutical Sciences, College of Biomedical and Life Sciences, Cardiff University, Cardiff, UK.
| | - Thilo Hagen
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
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Rahman MH, Asrafuzzaman M, Tusher MMH, Mosihuzzaman M, Khan MSH, Shoeb M, Rokeya B. Elucidation of anti-hyperglycemic activity of Psidium guajava L. leaves extract on streptozotocin induced neonatal diabetic Long-Evans rats. J Ayurveda Integr Med 2023; 14:100776. [PMID: 37722234 PMCID: PMC10511481 DOI: 10.1016/j.jaim.2023.100776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 06/21/2023] [Accepted: 07/08/2023] [Indexed: 09/20/2023] Open
Abstract
BACKGROUND Psidium guajava L (Guava) belongs to the Myrtaceae family and has been claimed to possess several pharmacological properties including antidiabetic. OBJECTIVE This study was designed to evaluate the anti-hyperglycemic activity of P guajava L leaves aqueous extract on neonatal streptozotocin-induced type 2 diabetic model rats. METHODS Streptozotocin was induced (90 mg/kg) intraperitoneally to 48 h old Long Evans rat pups. After three months, 18 male type-2 diabetic model rats were confirmed by OGTT (FG > 7 mmol/L). Therefore, experimental rats were divided into three groups 2) Diabetic water control (10 ml/kg), 3) Gliclazide treated (20 mg/kg), and 4) Extract treated group (1.25g/kg)] Six normal female rats comprised group 1 [Non-diabetic water control (10 ml/kg)]. All rats were treated orally with their respective treatment for 28 consecutive days. Blood samples were collected on 0 days (by tail cut method) and the end day (by cardiac puncture) of the experiment. The anti-hyperglycemic activity was evaluated by measuring fasting glucose, serum insulin, lipid profile, hepatic glycogen content, and intestinal glucose absorption by standard methods. RESULTS The serum glucose level of extract treated group was decreased by 16% as well as significantly (p<0.05) increased the serum insulin level (M±SD, 0 day vs 28thday; 0.319 ± 0.110 vs 0.600 ± 0.348, μg/L). Moreover, the extract-treated group also significantly (p<0.05) enhanced liver glycogen content and inhibited glucose absorption from the upper intestine. Besides, a significant (p < 0.05) reduction of LDL-cholesterol level was found in the extract-treated group (M±SD, 55 ± 33 vs 14 ± 9, mg/dl) compared with baseline values where other groups did not show any statistically remarkable changes. CONCLUSION Current study concludes that P guajava leaves aqueous extract enhances insulin secretion from pancreatic beta-cells and promotes glycogen synthesis in the liver. The extract also inhibits glucose absorption from the upper intestine and improves dyslipidemia to some extent. Therefore, possesses the potential for drug development against T2DM.
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Affiliation(s)
- Md Hafizur Rahman
- Asian Network of Research on Antidiabetic Plants, Bangladesh University of Health Sciences (BUHS), Dhaka, 1216, Bangladesh; Department of Chemistry, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Md Asrafuzzaman
- Asian Network of Research on Antidiabetic Plants, Bangladesh University of Health Sciences (BUHS), Dhaka, 1216, Bangladesh; Department of Pharmacology, Bangladesh University of Heath Sciences (BUHS), Dhaka, 1216, Bangladesh
| | - Md Mahedi Hassan Tusher
- Asian Network of Research on Antidiabetic Plants, Bangladesh University of Health Sciences (BUHS), Dhaka, 1216, Bangladesh; Department of Pharmacology, Bangladesh University of Heath Sciences (BUHS), Dhaka, 1216, Bangladesh
| | - M Mosihuzzaman
- Asian Network of Research on Antidiabetic Plants, Bangladesh University of Health Sciences (BUHS), Dhaka, 1216, Bangladesh
| | - Md Shahinul Haque Khan
- Asian Network of Research on Antidiabetic Plants, Bangladesh University of Health Sciences (BUHS), Dhaka, 1216, Bangladesh; Department of Chemistry, Bangladesh University of Health Science (BUHS), Dhaka, 1216, Bangladesh
| | - Mohammad Shoeb
- Department of Chemistry, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Begum Rokeya
- Asian Network of Research on Antidiabetic Plants, Bangladesh University of Health Sciences (BUHS), Dhaka, 1216, Bangladesh; Department of Pharmacology, Bangladesh University of Heath Sciences (BUHS), Dhaka, 1216, Bangladesh.
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Iannone V, Lok J, Babu AF, Gómez-Gallego C, Willman RM, Koistinen VM, Klåvus A, Kettunen MI, Kårlund A, Schwab U, Hanhineva K, Kolehmainen M, El-Nezami H. Associations of altered hepatic gene expression in American lifestyle-induced obesity syndrome diet-fed mice with metabolic changes during NAFLD development and progression. J Nutr Biochem 2023; 115:109307. [PMID: 36868506 DOI: 10.1016/j.jnutbio.2023.109307] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 01/20/2023] [Accepted: 02/24/2023] [Indexed: 03/05/2023]
Abstract
Non-alcoholic fatty liver disease (NAFLD) pathogenesis remains poorly understood due to the complex metabolic and inflammatory changes in the liver. This study aimed to elucidate hepatic events related to inflammation and lipid metabolism and their linkage with metabolic alterations during NAFLD in American lifestyle-induced obesity syndrome (ALIOS) diet-fed mice. Forty-eight C57BL/6J male mice were fed with ALIOS diet (n=24) or control chow diet (n=24) for 8, 12, and 16 weeks. At the end of each timepoint, eight mice were sacrificed where plasma and liver were collected. Hepatic fat accumulation was followed using magnetic resonance imaging and confirmed with histology. Further, targeted gene expression and non-targeted metabolomics analysis were conducted. Our results showed higher hepatic steatosis, body weight, energy consumption, and liver mass in ALIOS diet-fed mice compared to control mice. ALIOS diet altered expression of genes related to inflammation (Tnfa and IL-6) and lipid metabolism (Cd36, Fasn, Scd1, Cpt1a, and Ppara). Metabolomics analysis indicated decrease of lipids containing polyunsaturated fatty acids such as LPE(20:5) and LPC(20:5) with increase of other lipid species such as LPI(16:0) and LPC(16:2) and peptides such as alanyl-phenylalanine and glutamyl-arginine. We further observed novel correlations between different metabolites including sphingolipid, lysophospholipids, peptides, and bile acid with inflammation, lipid uptake and synthesis. Together with the reduction of antioxidant metabolites and gut microbiota-derived metabolites contribute to NAFLD development and progression. The combination of non-targeted metabolomics with gene expression in future studies can further identify key metabolic routes during NAFLD which could be the targets of potential novel therapeutics.
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Affiliation(s)
- Valeria Iannone
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
| | - Johnson Lok
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
| | - Ambrin Farizah Babu
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; Afekta Technologies Ltd., Kuopio, Finland
| | - Carlos Gómez-Gallego
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
| | - Roosa Maria Willman
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; Department of Medicine, Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Ville Mikael Koistinen
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; Afekta Technologies Ltd., Kuopio, Finland; Department of Life technologies, Food Sciences Unit, University of Turku, Turku, Finland
| | | | - Mikko I Kettunen
- Kuopio Biomedical Imaging Unit, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Anna Kårlund
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
| | - Ursula Schwab
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; Department of Medicine, Endocrinology and Clinical Nutrition, Kuopio University Hospital, Kuopio, Finland
| | - Kati Hanhineva
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; Afekta Technologies Ltd., Kuopio, Finland; Department of Life technologies, Food Sciences Unit, University of Turku, Turku, Finland.
| | - Marjukka Kolehmainen
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland.
| | - Hani El-Nezami
- School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; Molecular and Cell Biology Division, School of Biological Sciences, University of Hong Kong, Hong Kong China
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Hu W, Jiang C, Kim M, Xiao Y, Richter HJ, Guan D, Zhu K, Krusen BM, Roberts AN, Miller J, Steger DJ, Lazar MA. Isoform-specific functions of PPARγ in gene regulation and metabolism. Genes Dev 2022; 36:300-312. [PMID: 35273075 PMCID: PMC8973844 DOI: 10.1101/gad.349232.121] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 02/15/2022] [Indexed: 12/12/2022]
Abstract
In this study, Hu et al. investigated the specific functions of the two main PPARγ isoforms by generating mouse lines in which endogenous PPARγ1 and PPARγ2 were epitope-tagged to interrogate isoform-specific genomic binding, and mice deficient in either PPARγ1 or PPARγ2 to assess isoform-specific gene regulation. They show that PPARγ isoforms have specific and separable metabolic functions that may be targeted to improve therapy for insulin resistance and diabetes. Peroxisome proliferator-activated receptor γ (PPARγ) is a nuclear receptor that is a vital regulator of adipogenesis, insulin sensitivity, and lipid metabolism. Activation of PPARγ by antidiabetic thiazolidinediones (TZD) reverses insulin resistance but also leads to weight gain that limits the use of these drugs. There are two main PPARγ isoforms, but the specific functions of each are not established. Here we generated mouse lines in which endogenous PPARγ1 and PPARγ2 were epitope-tagged to interrogate isoform-specific genomic binding, and mice deficient in either PPARγ1 or PPARγ2 to assess isoform-specific gene regulation. Strikingly, although PPARγ1 and PPARγ2 contain identical DNA binding domains, we uncovered isoform-specific genomic binding sites in addition to shared sites. Moreover, PPARγ1 and PPARγ2 regulated a different set of genes in adipose tissue depots, suggesting distinct roles in adipocyte biology. Indeed, mice with selective deficiency of PPARγ1 maintained body temperature better than wild-type or PPARγ2-deficient mice. Most remarkably, although TZD treatment improved glucose tolerance in mice lacking either PPARγ1 or PPARγ2, the PPARγ1-deficient mice were protected from TZD-induced body weight gain compared with PPARγ2-deficient mice. Thus, PPARγ isoforms have specific and separable metabolic functions that may be targeted to improve therapy for insulin resistance and diabetes.
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Affiliation(s)
- Wenxiang Hu
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Chunjie Jiang
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Mindy Kim
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Yang Xiao
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Hannah J Richter
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Dongyin Guan
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Kun Zhu
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Brianna M Krusen
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Arielle N Roberts
- Philadelphia College of Osteopathic Medicine, Philadelphia, Pennsylvania 19131, USA
| | - Jessica Miller
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - David J Steger
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Mitchell A Lazar
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104, USA
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Cope HA, Blake BE, Love C, McCord J, Elmore SA, Harvey JB, Chappell VA, Fenton SE. Latent, sex-specific metabolic health effects in CD-1 mouse offspring exposed to PFOA or HFPO-DA (GenX) during gestation. Emerg Contam 2021; 7:219-235. [PMID: 35097227 PMCID: PMC8794304 DOI: 10.1016/j.emcon.2021.10.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
BACKGROUND Perfluorooctanoic acid (PFOA) is an environmental contaminant associated with adverse metabolic outcomes in developmentally exposed human populations and mouse models. Hexafluoropropylene oxide-dimer acid (HFPO-DA, commonly called GenX) has replaced PFOA in many industrial applications in the U.S. and Europe and has been measured in global water systems from <1 to 9350 ng/L HFPO-DA. Health effects data for GenX are lacking. OBJECTIVE Determine the effects of gestational exposure to GenX on offspring weight gain trajectory, adult metabolic health, liver pathology and key adipose gene pathways in male and female CD-1 mice. METHODS Daily oral doses of GenX (0.2, 1.0, 2.0 mg/kg), PFOA (0.1, 1.0 mg/kg), or vehicle control were administered to pregnant mice (gestation days 1.5-17.5). Offspring were fed a high- or low-fat diet (HFD or LFD) at weaning until necropsy at 6 or 18 weeks, and metabolic endpoints were measured over time. PFOA and GenX serum and urine concentrations, weight gain, serum lipid parameters, body mass composition, glucose tolerance, white adipose tissue gene expression, and liver histopathology were evaluated. RESULTS Prenatal exposure to GenX led to its accumulation in the serum and urine of 5-day old pups (P = 0.007, P < 0.001), which was undetectable by weaning. By 18 weeks of age, male mice fed LFD in the 2.0 mg/kg GenX group displayed increased weight gain (P < 0.05), fat mass (P = 0.016), hepatocellular microvesicular fatty change (P = 0.015), and insulin sensitivity (P = 0.014) in comparison to control males fed LFD. Female mice fed HFD had a significant increase in hepatocyte single cell necrosis in 1.0 mg/kg GenX group (P = 0.022) and 1.0 mg/kg PFOA group (P = 0.003) compared to control HFD females. Both sexes were affected by gestational GenX exposure; however, the observed phenotype varied between sex with males displaying more characteristics of metabolic disease and females exhibiting liver damage in response to the gestational exposure. CONCLUSIONS Prenatal exposure to 1 mg/kg GenX and 1 mg/kg PFOA induces adverse metabolic outcomes in adult mice that are diet- and sex-dependent. GenX also accumulated in pup serum, suggesting that placental and potentially lactational transfer are important exposure routes for GenX.
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Affiliation(s)
- Harlie A. Cope
- National Toxicology Program Laboratory, Division of the National Toxicology Program (DNTP), National Institutes of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Research Triangle Park, NC, USA
| | - Bevin E. Blake
- National Toxicology Program Laboratory, Division of the National Toxicology Program (DNTP), National Institutes of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Research Triangle Park, NC, USA
| | - Charlotte Love
- National Toxicology Program Laboratory, Division of the National Toxicology Program (DNTP), National Institutes of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Research Triangle Park, NC, USA
| | - James McCord
- Multimedia Methods Branch, Center for Environmental Measurement and Modeling, Office of Research and Development, U.S. Environmental Protection Agency, RTP, NC, USA
| | - Susan A. Elmore
- Cellular and Molecular Pathology Branch, DNTP, NIEHS, NIH, RTP, NC, USA
| | - Janice B. Harvey
- Cellular and Molecular Pathology Branch, DNTP, NIEHS, NIH, RTP, NC, USA
| | - Vesna A. Chappell
- National Toxicology Program Laboratory, Division of the National Toxicology Program (DNTP), National Institutes of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Research Triangle Park, NC, USA
| | - Suzanne E. Fenton
- National Toxicology Program Laboratory, Division of the National Toxicology Program (DNTP), National Institutes of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Research Triangle Park, NC, USA
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Jiang HW, Zhou Y, Zhou PY, Zhang TY, Hu JY, Bai XT. Protective Effects of Bariatric Surgery on Kidney Functions by Inhibiting Oxidative Stress Responses Through Activating PPARα in Rats With Diabetes. Front Physiol 2021; 12:662666. [PMID: 34262471 PMCID: PMC8275180 DOI: 10.3389/fphys.2021.662666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/14/2021] [Indexed: 12/22/2022] Open
Abstract
Objective The aim of this study was to explore the protective effects and the regulatory mechanisms of bariatric surgery on kidney injury in diabetic rats. Methods We established a useful type 2 diabetic rat model using high-fat and high-sugar diet feeding following low-dose streptozotocin (STZ) treatment. Sprague–Dawley (SD) rats were randomly divided into the following groups: control (Con) group, diabetic nephropathy (DN) group, and duodenal–jejunal bypass (DJB) surgery group. The food intake and body weight of rats were monitored and the glucose tolerance test (OGTT) test was performed every 2 weeks. The glomerular filtration rate (GFR) and urinary albumin excretion rate (UAFR) were measured to assess renal function. Hematoxylin–eosin (H&E), periodic acid–Schiff (PAS), and Masson staining were used to evaluate renal histopathological changes. TUNEL assay was performed to detect cell apoptosis. The expressions of oxidative stress factors and inflammatory factors in the renal tissues of rats were detected by ELISA. The expressions of PPARα, reactive oxygen species (ROS), and NF-κB were detected by immunofluorescence. For in vitro experiment, HK2 cells cultured with high glucose were treated with PPARα agonist, PPARα antagonist, and adenosine 5′-monophosphate (AMP)-activated protein kinase (AMPK) agonist. The expressions of AMPK/PPARα/NF-κB signaling pathway-related proteins were detected by Western blot. Results Bariatric surgery improved the glucose tolerance of DN rats. The GFR was decreased, the promotion of urinary albumin excretion rate (UAER) was inhibited, and the renal injury was alleviated. The extracellular matrix fraction was decreased and the renal function was improved. Meanwhile, bariatric surgery activates PPARα, inhibits ROS release, reduces oxidative stress injury, and reduces renal cell apoptosis. In vitro experiment results showed that the AMPK activator could activate PPARα, downregulate NF-κB, and inhibit inflammatory response. The phosphorylation of AMPK was inhibited by PPARα antagonism. Conclusion Bariatric surgery can activate PPARα, inhibit oxidative stress injury, and improve glucose metabolism and renal function in DN rats.
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Affiliation(s)
- Hong-Wei Jiang
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, China
| | - Yong Zhou
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, China
| | - Pin-Yi Zhou
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, China
| | - Tian-Yi Zhang
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, China
| | - Jing-Yao Hu
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, China
| | - Xue-Tao Bai
- Department of Anaesthesiology, The Fourth Affiliated Hospital of China Medical University, Shenyang, China
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Geberhiwot T, Baig S, Obringer C, Girard D, Dawson C, Manolopoulos K, Messaddeq N, Bel Lassen P, Clement K, Tomlinson JW, Steeds RP, Dollfus H, Petrovsky N, Marion V. Relative Adipose Tissue Failure in Alström Syndrome Drives Obesity-Induced Insulin Resistance. Diabetes 2021; 70:364-376. [PMID: 32994277 PMCID: PMC7881858 DOI: 10.2337/db20-0647] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 09/17/2020] [Indexed: 12/11/2022]
Abstract
Obesity is a major risk factor for insulin resistance (IR) and its attendant complications. The pathogenic mechanisms linking them remain poorly understood, partly due to a lack of intermediary monogenic human phenotypes. Here, we report on a monogenic form of IR-prone obesity, Alström syndrome (ALMS). Twenty-three subjects with monogenic or polygenic obesity underwent hyperinsulinemic-euglycemic clamping with concomitant adipose tissue (AT) microdialysis and an in-depth analysis of subcutaneous AT histology. We have shown a relative AT failure in a monogenic obese cohort, a finding supported by observations in a novel conditional mouse model (Alms flin/flin ) and ALMS1-silenced human primary adipocytes, whereas selective reactivation of ALMS1 gene in AT of an ALMS conditional knockdown mouse model (Alms flin/flin ; Adipo-Cre +/- ) restores systemic insulin sensitivity and glucose tolerance. Hence, we show for the first time the relative AT failure in human obese cohorts to be a major determinant of accelerated IR without evidence of lipodystrophy. These new insights into adipocyte-driven IR may assist development of AT-targeted therapeutic strategies for diabetes.
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Affiliation(s)
- Tarekegn Geberhiwot
- Department of Diabetes, Endocrinology and Metabolism, Queen Elizabeth Hospital Birmingham, Birmingham, U.K.
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, U.K
| | - Shanat Baig
- Department of Diabetes, Endocrinology and Metabolism, Queen Elizabeth Hospital Birmingham, Birmingham, U.K
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, U.K
| | - Cathy Obringer
- INSERM, UMR_U1112, Laboratoire de Génétique Médicale, Université de Strasbourg, Hôpitaux Universitaires de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Strasbourg, France
| | - Dorothée Girard
- Flinders Medical Centre, Flinders University, Bedford Park, Australia
| | - Charlotte Dawson
- Department of Diabetes, Endocrinology and Metabolism, Queen Elizabeth Hospital Birmingham, Birmingham, U.K
| | | | - Nadia Messaddeq
- Institute of Genetics and Molecular and Cellular Biology, CNRS/INSERM, Collège de France, Illkirch, France
| | - Pierre Bel Lassen
- NutriOmics Unit, INSERM, Sorbonne Université, Assistance-Publique Hôpitaux de Paris, and Nutrition Department, Pitié-Salpêtrière Hospital, Paris, France
| | - Karine Clement
- NutriOmics Unit, INSERM, Sorbonne Université, Assistance-Publique Hôpitaux de Paris, and Nutrition Department, Pitié-Salpêtrière Hospital, Paris, France
| | - Jeremy W Tomlinson
- Oxford Centre for Diabetes, Endocrinology and Metabolism, NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford, U.K
| | - Richard P Steeds
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, U.K
| | - Hélène Dollfus
- INSERM, UMR_U1112, Laboratoire de Génétique Médicale, Université de Strasbourg, Hôpitaux Universitaires de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Strasbourg, France
- Service de Génétique Médicale et CARGO, Institut de Génétique Médicale d'Alsace, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Nikolai Petrovsky
- Flinders Medical Centre, Flinders University, Bedford Park, Australia
- Vaxine Pty Ltd, Bedford Park, Australia
| | - Vincent Marion
- INSERM, UMR_U1112, Ciliopathies Modeling and Associated Therapies Group, Laboratoire de Génétique Médicale, Fédération de Medecine Translationelle de Strasbourg, Strasbourg, France
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Virtue S, Petkevicius K, Moreno-Navarrete JM, Jenkins B, Hart D, Dale M, Koulman A, Fernández-Real JM, Vidal-Puig A. Peroxisome Proliferator-Activated Receptor γ2 Controls the Rate of Adipose Tissue Lipid Storage and Determines Metabolic Flexibility. Cell Rep 2020; 24:2005-2012.e7. [PMID: 30134163 PMCID: PMC6113930 DOI: 10.1016/j.celrep.2018.07.063] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 03/15/2018] [Accepted: 07/18/2018] [Indexed: 01/06/2023] Open
Abstract
One understudied function of white adipose tissue (AT) is its role in postprandial lipid buffering. In this study, we demonstrate that mice lacking the adipose tissue-specific transcription factor peroxisome proliferator-activated receptor γ2 (PPARγ2) exhibit a defect in their rate of adipose tissue lipid storage. Impaired adipose tissue storage rate reduces metabolic flexibility, without compromising fasted glucose tolerance or insulin sensitivity, even following prolonged high-fat feeding. However, acutely overfeeding PPARγ2-KO mice caused a 10-fold increase in insulin levels compared with controls. Although impaired adipose tissue storage rate did not result in insulin resistance in young mice, 1-year-old PPARγ2-KO mice developed skeletal muscle insulin resistance. Our data indicate that failed adipose tissue storage may occur prior to defects in glucose handling and that overfeeding protocols may uncover genes controlling adipose tissue storage rate, as opposed to capacity, and act as a diagnostic test for early-stage human metabolic disease. Mice lacking PPARγ2 have impaired adipose tissue lipid storage rate Low adipose tissue storage rate leads to metabolic inflexibility Acute hypercaloric challenges can detect impaired adipose tissue lipid storage rate Chronic adipose tissue metabolic inflexibility leads to insulin resistance with age
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Affiliation(s)
- Sam Virtue
- The University of Cambridge Metabolic Research Laboratories, Wellcome Trust-MRC Institute of Metabolic Science, Cambridge CB2 0QQ, UK.
| | - Kasparas Petkevicius
- The University of Cambridge Metabolic Research Laboratories, Wellcome Trust-MRC Institute of Metabolic Science, Cambridge CB2 0QQ, UK
| | - José Maria Moreno-Navarrete
- Biomedical Research Institute of Girona (IDIBGI), CIBERobn Pathophysiology of Obesity and Nutrition, Hospital of Girona "Dr. Josep Trueta," Avinguda de França s/n, and Department of Medical Sciences, Faculty of Medicine, University of Girona, Girona, Spain
| | - Benjamin Jenkins
- The University of Cambridge Metabolic Research Laboratories, Wellcome Trust-MRC Institute of Metabolic Science, Cambridge CB2 0QQ, UK
| | - Daniel Hart
- The University of Cambridge Metabolic Research Laboratories, Wellcome Trust-MRC Institute of Metabolic Science, Cambridge CB2 0QQ, UK
| | - Martin Dale
- The University of Cambridge Metabolic Research Laboratories, Wellcome Trust-MRC Institute of Metabolic Science, Cambridge CB2 0QQ, UK
| | - Albert Koulman
- The University of Cambridge Metabolic Research Laboratories, Wellcome Trust-MRC Institute of Metabolic Science, Cambridge CB2 0QQ, UK
| | - José Manuel Fernández-Real
- Biomedical Research Institute of Girona (IDIBGI), CIBERobn Pathophysiology of Obesity and Nutrition, Hospital of Girona "Dr. Josep Trueta," Avinguda de França s/n, and Department of Medical Sciences, Faculty of Medicine, University of Girona, Girona, Spain
| | - Antonio Vidal-Puig
- The University of Cambridge Metabolic Research Laboratories, Wellcome Trust-MRC Institute of Metabolic Science, Cambridge CB2 0QQ, UK; Wellcome Trust Sanger Institute, Hinxton CB10 1SA, UK.
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Blond MB, Schnurr TM, Rosenkilde M, Quist JS, Gram AS, Reichkendler MH, Auerbach PL, Nordby P, Skovgaard LT, Ribel-Madsen R, Justesen JM, Kilpeläinen TO, Ploug T, Stallknecht BM, Hansen T. PPARG Pro12Ala Ala carriers exhibit greater improvements in peripheral insulin sensitivity in response to 12 weeks of aerobic exercise training. Physiol Genomics 2019; 51:254-260. [DOI: 10.1152/physiolgenomics.00101.2018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The Ala allele of PPARG Pro12Ala ( rs1801282 ) is associated with greater improvements to the glucose metabolism in exercise studies, but whether this extends to peripheral insulin sensitivity is unknown. Our objective was to investigate the effect of PPARG Pro12Ala on exercise-induced changes in peripheral insulin sensitivity. A total of 124 (91 Pro homozygotes and 33 Ala carriers) previously physically inactive healthy young men and women with overweight or class 1 obesity who completed a 12 wk aerobic exercise intervention were included in the analysis. All participants underwent a hyperinsulinemic euglycemic clamp before and after the 12 wk intervention. The prescribed exercise frequency was 5–7 days/wk, and the exercise energy expenditure was 2,100 4,200 kcal/wk for men and 1,600 kcal/wk for women. Insulin sensitivity improved significantly in both genotype groups. However, Ala carriers had a 1.13-fold (95% confidence interval 1.01; 1.26, P = 0.032) greater improvement in insulin sensitivity from baseline compared with Pro homozygotes. Our data support that PPARG Pro12Ala modifies the effect of aerobic exercise on peripheral insulin sensitivity.
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Affiliation(s)
- Martin Bæk Blond
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Theresia Maria Schnurr
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Mads Rosenkilde
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jonas Salling Quist
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anne Sofie Gram
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Michala Holm Reichkendler
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet Copenhagen University Hospital, Copenhagen, Denmark
| | - Pernille Landrock Auerbach
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Pernille Nordby
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lene Theil Skovgaard
- Section of Biostatistics, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Rasmus Ribel-Madsen
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Johanne Marie Justesen
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Tuomas Oskari Kilpeläinen
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Thorkil Ploug
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Bente Merete Stallknecht
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Torben Hansen
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Karimi-Sales E, Ebrahimi-Kalan A, Alipour MR. Preventive effect of trans-chalcone on non-alcoholic steatohepatitis: Improvement of hepatic lipid metabolism. Biomed Pharmacother 2018; 109:1306-1312. [PMID: 30551380 DOI: 10.1016/j.biopha.2018.10.196] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 10/25/2018] [Accepted: 10/31/2018] [Indexed: 12/14/2022] Open
Abstract
Non-alcoholic steatohepatitis (NASH) is an inflammatory and progressive form of non-alcoholic fatty liver disease. However, there are no FDA-approved drugs for this condition. Lipids accumulated in NASH have a direct role in the progression of this disease. Therefore, this study for the first time explored the preventive effect of trans-chalcone on NASH through the modulation of sterol regulatory element binding protein (SREBP)-1c, SREBP-2, hepatic fatty acid synthesis (FAS) enzyme, proliferator-activated receptor (PPAR)-α, and PPAR-γ2 levels, which are involved in hepatic lipid metabolism. In this study, male rats were randomly divided into three groups (n = 7): Control, received 10% tween 80; NASH, received 10% tween 80 and 10 ml/kg high-fat emulsion (high-fat diet, HFD); and NASH + TC, received 20 mg/kg trans-chalcone and 10 ml/kg HFD. All treatments were performed by once-daily oral gavage for 6 weeks. Liver and blood samples were collected and serum levels of alkaline phosphatase (ALP), aspartate aminotransferase (AST), alanine aminotransferase (ALT), triglyceride, total cholesterol, low-density lipoprotein (LDL)-cholesterol, and high-density lipoprotein (HDL)-cholesterol, as well as hepatic levels of SREBP-1c, SREBP-2, FAS, PPAR-α, and PPAR-γ2, were measured. Moreover, hematoxylin and eosin stained tissues were used for histological analysis. In this study, treatment of HFD-fed rats with trans-chalcone significantly reduced abnormalities in liver histology, serum levels of liver injury markers, liver index, and hepatic levels of SREBP-1c, SREBP-2, FAS, and PPAR-γ2. Furthermore, trans-chalcone significantly increased hepatic PPARα levels in these rats. Therefore, it seems that trans-chalcone protects the liver of HFD-fed rats against NASH development through reduction of SREBP-1c/ FAS- and PPAR-γ2-related lipogenesis, attenuation of SREBP-2-related cholesterol synthesis, and elevation of PPARα-related fatty acid oxidation.
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Affiliation(s)
- Elham Karimi-Sales
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Physiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Abbas Ebrahimi-Kalan
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Affiliation(s)
- Saverio Cinti
- Professor of Human Anatomy, Director, Center of Obesity, University of Ancona (Politecnica delle Marche), Ancona, Italy
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13
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Kamble PG, Pereira MJ, Gustafsson S, Lundkvist P, Castillejo-López C, Fall T, Ingelsson E, Eriksson JW. Role of peroxisome proliferator-activated receptor gamma Pro12Ala polymorphism in human adipose tissue: assessment of adipogenesis and adipocyte glucose and lipid turnover. Adipocyte 2018; 7:285-296. [PMID: 30064293 PMCID: PMC6768277 DOI: 10.1080/21623945.2018.1503030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The protective mechanisms of peroxisome proliferator-activated receptor gamma (PPARγ) Pro12Ala polymorphism in type 2 diabetes (T2D) are unclear. We obtained subcutaneous adipose tissue (AT) before and 3 h after oral glucose (OGTT) in carriers and non-carriers of the Ala allele (12 Pro/Pro, 15 Pro/Ala, and 13 Ala/Ala). Adipogenesis, adipocyte glucose uptake and lipolysis as well as PPARγ target gene expression were investigated and compared between the genotype groups. During fasting and post-OGTT, neither basal nor insulin-stimulated adipocyte glucose uptake differed between genotypes. Compared to fasting, a decreased hormone-sensitive lipase gene expression in Pro/Pro (p < 0.05) was accompanied with a higher antilipolytic effect of insulin post-OGTT (p < 0.01). The adipocyte size was similar across groups. Preadipocyte differentiation rates between Pro/Pro and Ala/Ala were unchanged. In conclusion, no major differences in AT differentiation, glucose uptake, lipolysis or expression of PPARγ target genes were observed between different PPARγ Pro12Ala genotypes. Albeit small, our study may suggest that other pathways in AT or effects exerted in other tissues might contribute to the Pro12Ala-mediated protection against T2D.
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Affiliation(s)
- Prasad G. Kamble
- Department of Medical Sciences, Clinical Diabetes and Metabolism, Uppsala University, Uppsala, Sweden
| | - Maria J. Pereira
- Department of Medical Sciences, Clinical Diabetes and Metabolism, Uppsala University, Uppsala, Sweden
| | - Stefan Gustafsson
- Department of Medical Sciences, Molecular Epidemiology and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Per Lundkvist
- Department of Medical Sciences, Clinical Diabetes and Metabolism, Uppsala University, Uppsala, Sweden
| | - Casimiro Castillejo-López
- Department of Medical Sciences, Molecular Epidemiology and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Tove Fall
- Department of Medical Sciences, Molecular Epidemiology and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Erik Ingelsson
- Department of Medical Sciences, Molecular Epidemiology and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
- Department of Medicine, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Jan W. Eriksson
- Department of Medical Sciences, Clinical Diabetes and Metabolism, Uppsala University, Uppsala, Sweden
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Corrales P, Vidal-Puig A, Medina-Gómez G. PPARs and Metabolic Disorders Associated with Challenged Adipose Tissue Plasticity. Int J Mol Sci 2018; 19:ijms19072124. [PMID: 30037087 PMCID: PMC6073677 DOI: 10.3390/ijms19072124] [Citation(s) in RCA: 102] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 07/13/2018] [Accepted: 07/18/2018] [Indexed: 02/07/2023] Open
Abstract
Peroxisome proliferator-activated receptors (PPARs) are members of a family of nuclear hormone receptors that exert their transcriptional control on genes harboring PPAR-responsive regulatory elements (PPRE) in partnership with retinoid X receptors (RXR). The activation of PPARs coordinated by specific coactivators/repressors regulate networks of genes controlling diverse homeostatic processes involving inflammation, adipogenesis, lipid metabolism, glucose homeostasis, and insulin resistance. Defects in PPARs have been linked to lipodystrophy, obesity, and insulin resistance as a result of the impairment of adipose tissue expandability and functionality. PPARs can act as lipid sensors, and when optimally activated, can rewire many of the metabolic pathways typically disrupted in obesity leading to an improvement of metabolic homeostasis. PPARs also contribute to the homeostasis of adipose tissue under challenging physiological circumstances, such as pregnancy and aging. Given their potential pathogenic role and their therapeutic potential, the benefits of PPARs activation should not only be considered relevant in the context of energy balance-associated pathologies and insulin resistance but also as potential relevant targets in the context of diabetic pregnancy and changes in body composition and metabolic stress associated with aging. Here, we review the rationale for the optimization of PPAR activation under these conditions.
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Affiliation(s)
- Patricia Corrales
- Área de Bioquímica y Biología Molecular, Departamento de Ciencias Básicas de la Salud, Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos, Avda. de Atenas s/n. Alcorcón, 28922 Madrid, Spain.
| | - Antonio Vidal-Puig
- Metabolic Research Laboratories, Wellcome Trust MRC Institute of Metabolic Science, Addenbrooke's Hospital, University of Cambridge, Cambridge CB2 0QQ, UK.
- Wellcome Trust Sanger Institute, Hinxton, Cambridgeshire CB10 1SA, UK.
| | - Gema Medina-Gómez
- Área de Bioquímica y Biología Molecular, Departamento de Ciencias Básicas de la Salud, Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos, Avda. de Atenas s/n. Alcorcón, 28922 Madrid, Spain.
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Entezari MH, Salehi R, Kazemi M, Janghorbani M, Kafeshani M. Comparison of the effect of the Dietary Approaches to Stop Hypertension diet with usual dietary advice on expression of peroxisome proliferators-activated receptor gamma gene in women: A randomized controlled clinical trial. ARYA Atheroscler 2018; 14:24-31. [PMID: 29942335 PMCID: PMC6011851 DOI: 10.22122/arya.v14i1.1565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Peroxisome proliferator-activated receptor gamma (PPAR-γ) which controls body weight, glucose homeostasis, and adipocyte differentiation is a valuable candidate gene for insulin resistance (IR). The present study aimed to compare the effects of the Dietary Approaches to Stop Hypertension (DASH) diet and usual dietary advice (UDA) on PPAR-γ gene expression in women at risk for cardiovascular disease (CVD). METHODS This randomized controlled trial was performed on 44 women aged 20-50 years at risk for CVD (BMI > 25 kg/m2 and low physical activity). Participants were randomly assigned to the UDA (n = 22) or DASH (n = 22) diets for 12 weeks. The DASH diet was rich in fruits, vegetables, whole grains and low-fat dairy products and low in saturated fat, total fat, cholesterol, refined grains and sweets, with a total of 2400 mg/day sodium. The UDA diet was a regular diet with healthy dietary advice. Anthropometric indices and PPAR-γ gene expression were measured and compared between the two groups at the end of the study. RESULTS After the intervention, body mass index (BMI) and waist circumference (WC) significantly decreased in the DASH group (P < 0.050) but the results showed no significant differences between the two groups. At the end of the trial, PPAR-γ gene expression was significantly different between the UDA and the DASH diet groups (P = 0.040) and this difference remained significant after adjustment for BMI, and physical activity (P = 0.030). CONCLUSION The result of the study showed that the DASH diet significantly decreased the expression of PPAR-γ. This finding was unexpected and future studies on the current topic are therefore recommended.
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Affiliation(s)
- Mohammad Hasan Entezari
- Associate Professor, School of Nutrition and Food Sciences AND Food Security and Nutrition Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Rasol Salehi
- Associate Professor, Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammad Kazemi
- Assistant Professor, Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohsen Janghorbani
- Professor, Department of Epidemiology and Biostatistics, School of Public Health , Isfahan University of Medical Sciences, Isfahan, Iran
| | - Marzieh Kafeshani
- School of Nutrition and Food Sciences AND Food Security and Nutrition Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
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Prabakaran AD, Karakkat JV, Vijayan R, Chalissery J, Ibrahim MF, Kaimala S, Adeghate EA, Al-Marzouqi AH, Ansari SA, Mensah-Brown E, Emerald BS. Identification of early indicators of altered metabolism in normal development using a rodent model system. Dis Model Mech 2018; 11:dmm.031815. [PMID: 29434026 PMCID: PMC5897726 DOI: 10.1242/dmm.031815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Accepted: 01/15/2018] [Indexed: 11/20/2022] Open
Abstract
Although the existence of a close relationship between the early maternal developmental environment, fetal size at birth and the risk of developing disease in adulthood has been suggested, most studies, however, employed experimentally induced intrauterine growth restriction as a model to link this with later adult disease. Because embryonic size variation also occurs under normal growth and differentiation, elucidating the molecular mechanisms underlying these changes and their relevance to later adult disease risk becomes important. The birth weight of rat pups vary according to the uterine horn positions. Using birth weight as a marker, we compared two groups of rat pups – lower birth weight (LBW, 5th to 25th percentile) and average birth weight (ABW, 50th to 75th percentile) – using morphological, biochemical and molecular biology, and genetic techniques. Our results show that insulin metabolism, Pi3k/Akt and Pparγ signaling and the genes regulating growth and metabolism are significantly different in these groups. Methylation at the promoter of the InsII (Ins2) gene and DNA methyltransferase 1 in LBW pups are both increased. Additionally, the Dnmt1 repressor complex, which includes Hdac1, Rb (Rb1) and E2f1, was also upregulated in LBW pups. We conclude that the Dnmt1 repressor complex, which regulates the restriction point of the cell cycle, retards the rate at which cells traverse the G1 or G0 phase of the cell cycle in LBW pups, thereby slowing down growth. This regulatory mechanism mediated by Dnmt1 might contribute to the production of small-size pups and altered physiology and pathology in adult life. Summary: This study suggests an important link between the early embryonic environment and later adult physiology and pathology. At least one process by which this might be coordinated is through the regulatory mechanisms mediated by Dnmt1.
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Affiliation(s)
- Ashok Daniel Prabakaran
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Jimsheena Valiyakath Karakkat
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Ranjit Vijayan
- Department of Biology, College of Science, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Jisha Chalissery
- Department of Biochemistry, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Marwa F Ibrahim
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Suneesh Kaimala
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Ernest A Adeghate
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Ahmed Hassan Al-Marzouqi
- Department of Biochemistry, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE.,Department of Basic Medical Sciences, College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai Healthcare City, PO Box 505055, Dubai, UAE
| | - Suraiya Anjum Ansari
- Department of Biochemistry, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Eric Mensah-Brown
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
| | - Bright Starling Emerald
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, PO Box 17666, Abu Dhabi, UAE
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Almeida MM, Dias-Rocha CP, Souza AS, Muros MF, Mendonca LS, Pazos-Moura CC, Trevenzoli IH. Perinatal maternal high-fat diet induces early obesity and sex-specific alterations of the endocannabinoid system in white and brown adipose tissue of weanling rat offspring. Br J Nutr 2017; 118:788-803. [PMID: 29110748 DOI: 10.1017/S0007114517002884] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Perinatal maternal high-fat (HF) diet programmes offspring obesity. Obesity is associated with overactivation of the endocannabinoid system (ECS) in adult subjects, but the role of the ECS in the developmental origins of obesity is mostly unknown. The ECS consists of endocannabinoids, cannabinoid receptors (cannabinoid type-1 receptor (CB1) and cannabinoid type-2 receptor (CB2)) and metabolising enzymes. We hypothesised that perinatal maternal HF diet would alter the ECS in a sex-dependent manner in white and brown adipose tissue of rat offspring at weaning in parallel to obesity development. Female rats received standard diet (9 % energy content from fat) or HF diet (29 % energy content from fat) before mating, during pregnancy and lactation. At weaning, male and female offspring were killed for tissue harvest. Maternal HF diet induced early obesity, white adipocyte hypertrophy and increased lipid accumulation in brown adipose tissue associated with sex-specific changes of the ECS's components in weanling rats. In male pups, maternal HF diet decreased CB1 and CB2 protein in subcutaneous adipose tissue. In female pups, maternal HF diet increased visceral and decreased subcutaneous CB1. In brown adipose tissue, maternal HF diet increased CB1 regardless of pup sex. In addition, maternal HF diet differentially changed oestrogen receptor across the adipose depots in male and female pups. The ECS and oestrogen signalling play an important role in lipogenesis, adipogenesis and thermogenesis, and we observed early changes in their targets in adipose depots of the offspring. The present findings provide insights into the involvement of the ECS in the developmental origins of metabolic disease induced by inadequate maternal nutrition in early life.
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Lee H, Qian K, von Toerne C, Hoerburger L, Claussnitzer M, Hoffmann C, Glunk V, Wahl S, Breier M, Eck F, Jafari L, Molnos S, Grallert H, Dahlman I, Arner P, Brunner C, Hauner H, Hauck SM, Laumen H. Allele-specific quantitative proteomics unravels molecular mechanisms modulated by cis-regulatory PPARG locus variation. Nucleic Acids Res 2017; 45:3266-3279. [PMID: 28334807 PMCID: PMC5389726 DOI: 10.1093/nar/gkx105] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 02/07/2017] [Indexed: 12/11/2022] Open
Abstract
Genome-wide association studies identified numerous disease risk loci. Delineating molecular mechanisms influenced by cis-regulatory variants is essential to understand gene regulation and ultimately disease pathophysiology. Combining bioinformatics and public domain chromatin information with quantitative proteomics supports prediction of cis-regulatory variants and enabled identification of allele-dependent binding of both, transcription factors and coregulators at the type 2 diabetes associated PPARG locus. We found rs7647481A nonrisk allele binding of Yin Yang 1 (YY1), confirmed by allele-specific chromatin immunoprecipitation in primary adipocytes. Quantitative proteomics also found the coregulator RING1 and YY1 binding protein (RYBP) whose mRNA levels correlate with improved insulin sensitivity in primary adipose cells carrying the rs7647481A nonrisk allele. Our findings support a concept with diverse cis-regulatory variants contributing to disease pathophysiology at one locus. Proteome-wide identification of both, transcription factors and coregulators, can profoundly improve understanding of mechanisms underlying genetic associations.
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Affiliation(s)
- Heekyoung Lee
- Else Kroener-Fresenius-Center for Nutritional Medicine, Chair of Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,ZIEL - Institute for Food & Health, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München and Technische Universität München, 85354 Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), Germany
| | - Kun Qian
- Else Kroener-Fresenius-Center for Nutritional Medicine, Chair of Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,ZIEL - Institute for Food & Health, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München and Technische Universität München, 85354 Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), Germany.,Research Unit Protein Science, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Christine von Toerne
- German Center for Diabetes Research (DZD), Germany.,Research Unit Protein Science, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Lena Hoerburger
- ZIEL - Institute for Food & Health, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Else Kroener-Fresenius-Center for Nutritional Medicine, Paediatric Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany
| | - Melina Claussnitzer
- Else Kroener-Fresenius-Center for Nutritional Medicine, Chair of Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,ZIEL - Institute for Food & Health, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München and Technische Universität München, 85354 Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), Germany.,Hebrew SeniorLife Institute for Aging Research, Harvard Medical School, Boston, MA 02131, USA
| | - Christoph Hoffmann
- ZIEL - Institute for Food & Health, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Else Kroener-Fresenius-Center for Nutritional Medicine, Chair of Molecular Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany
| | - Viktoria Glunk
- Else Kroener-Fresenius-Center for Nutritional Medicine, Chair of Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,ZIEL - Institute for Food & Health, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München and Technische Universität München, 85354 Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), Germany
| | - Simone Wahl
- German Center for Diabetes Research (DZD), Germany.,Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, 85764 Neuherberg, Germany.,Institute of Epidemiology II, Helmholtz Zentrum München, Neuherberg, Germany
| | - Michaela Breier
- German Center for Diabetes Research (DZD), Germany.,Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, 85764 Neuherberg, Germany.,Institute of Epidemiology II, Helmholtz Zentrum München, Neuherberg, Germany
| | - Franziska Eck
- Research Unit Protein Science, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Leili Jafari
- Research Unit Protein Science, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Sophie Molnos
- German Center for Diabetes Research (DZD), Germany.,Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, 85764 Neuherberg, Germany.,Institute of Epidemiology II, Helmholtz Zentrum München, Neuherberg, Germany
| | - Harald Grallert
- Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München and Technische Universität München, 85354 Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), Germany.,Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, 85764 Neuherberg, Germany.,Institute of Epidemiology II, Helmholtz Zentrum München, Neuherberg, Germany
| | - Ingrid Dahlman
- Department of Medicine, Huddinge, Karolinska Institutet, SE-141 86 Stockholm, Sweden
| | - Peter Arner
- Department of Medicine, Huddinge, Karolinska Institutet, SE-141 86 Stockholm, Sweden
| | - Cornelia Brunner
- Klinik für Hals-Nasen-Ohrenheilkunde, Universitätsklinik Ulm, 89075 Ulm, Germany
| | - Hans Hauner
- Else Kroener-Fresenius-Center for Nutritional Medicine, Chair of Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,ZIEL - Institute for Food & Health, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München and Technische Universität München, 85354 Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), Germany.,Else Kroener-Fresenius-Center for Nutritional Medicine, Klinikum rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Stefanie M Hauck
- German Center for Diabetes Research (DZD), Germany.,Research Unit Protein Science, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Helmut Laumen
- Else Kroener-Fresenius-Center for Nutritional Medicine, Chair of Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,ZIEL - Institute for Food & Health, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München and Technische Universität München, 85354 Freising-Weihenstephan, Germany.,German Center for Diabetes Research (DZD), Germany.,Research Unit Protein Science, Helmholtz Zentrum München, 85764 Neuherberg, Germany.,Else Kroener-Fresenius-Center for Nutritional Medicine, Paediatric Nutritional Medicine, Technische Universität München, 85354 Freising-Weihenstephan, Germany.,Institute of Experimental Genetics, Helmholtz Zentrum München, 85764 Neuherberg, Germany
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20
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Salma N, Song JS, Kawakami A, Devi SP, Khaled M, Cacicedo JM, Fisher DE. Tfe3 and Tfeb Transcriptionally Regulate Peroxisome Proliferator-Activated Receptor γ2 Expression in Adipocytes and Mediate Adiponectin and Glucose Levels in Mice. Mol Cell Biol 2017; 37:e00608-16. [PMID: 28483914 DOI: 10.1128/MCB.00608-16] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 04/19/2017] [Indexed: 12/28/2022] Open
Abstract
Members of the MiT transcription factor family are pivotal regulators of several lineage-selective differentiation programs. We show that two of these, Tfeb and Tfe3, control the regulator of adipogenesis, peroxisome proliferator-activated receptor γ2 (Pparγ2). Knockdown of Tfeb or Tfe3 expression during in vitro adipogenesis causes dramatic downregulation of Pparγ2 expression as well as adipogenesis. Additionally, we found that these factors regulate Pparγ2 in mature adipocytes. Next, we demonstrated that Tfeb and Tfe3 act directly by binding to consensus E-boxes within the Pparγ transcriptional regulatory region. This transcriptional control also exists in vivo, as we discovered that wild-type mice in the fed state increased their expression of Tfe3, Tf3b, and Pparγ in white adipose tissue. Furthermore, Tfe3 knockout (Tfe3KO) mice in the fed state failed to upregulate Pparγ and the adiponectin gene, a Pparγ-dependent gene, confirming the in vivo role for Tfe3. Lastly, we found that blood glucose is elevated and serum adiponectin levels are suppressed in the Tfe3KO mice, indicating that the Tfe3/Tfeb/Pparγ2 axis may contribute to whole-body energy balance. Thus, we offer new insights into the upstream regulation of Pparγ by Tfe3/Tf3b and propose that targeting these transcription factors may offer opportunities to complement existing approaches for the treatment of diseases that have dysregulated energy metabolism.
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21
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Shin JH, Jung JH. Non-alcoholic fatty liver disease and flavonoids: Current perspectives. Clin Res Hepatol Gastroenterol 2017; 41:17-24. [PMID: 27545758 DOI: 10.1016/j.clinre.2016.07.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 06/21/2016] [Accepted: 07/07/2016] [Indexed: 02/04/2023]
Abstract
Non-alcoholic fatty liver disease (NAFLD) is an accumulation of fat in the liver despite a low level of alcohol intake, with signs of hepatomegaly. Although in the past, NAFLD was predominantly viewed as an aspect of metabolic syndrome, it is now considered that it should be classified as an independent condition similar to obesity, diabetes, and hypertension. Therefore, new treatment strategies, not based on correcting insulin resistance, are needed for NAFLD. This work analyzes methods of prevention, therapeutic approaches, and mechanisms involved in NAFLD, focusing on the use of flavonoids (epigallocatechin-3-gallate, resveratrol, anthocyanins, and isoflavones) with high antioxidant capacity. In addition, the mechanisms of cholesterol accumulation in the liver are identified as potential avenues for entirely new approaches to NAFLD treatment, contrasting the well-known relation between neutral fat and NAFLD.
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Affiliation(s)
- Jung Hee Shin
- Department of Food & Nutrition, Joongbu University, 201 Daehak-ro, Chubu-myeon, Geumsan-gun, Chungcheongnam-Do, Republic of Korea.
| | - Ji Hye Jung
- Institute for Clinical Nutrition, Inje University, Mareunnae-ro 9, Jung-gu, Seoul, Republic of Korea.
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22
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Heinonen S, Muniandy M, Buzkova J, Mardinoglu A, Rodríguez A, Frühbeck G, Hakkarainen A, Lundbom J, Lundbom N, Kaprio J, Rissanen A, Pietiläinen KH. Mitochondria-related transcriptional signature is downregulated in adipocytes in obesity: a study of young healthy MZ twins. Diabetologia 2017; 60:169-181. [PMID: 27734103 DOI: 10.1007/s00125-016-4121-2] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 09/09/2016] [Indexed: 01/04/2023]
Abstract
AIMS/HYPOTHESIS Low mitochondrial activity in adipose tissue is suggested to be an underlying factor in obesity and its metabolic complications. We aimed to find out whether mitochondrial measures are downregulated in obesity also in isolated adipocytes. METHODS We studied young adult monozygotic (MZ) twin pairs discordant (n = 14, intrapair difference ΔBMI ≥ 3 kg/m2) and concordant (n = 5, ΔBMI < 3 kg/m2) for BMI, identified from ten birth cohorts of 22- to 36-year-old Finnish twins. Abdominal body fat distribution (MRI), liver fat content (magnetic resonance spectroscopy), insulin sensitivity (OGTT), high-sensitivity C-reactive protein, serum lipids and adipokines were measured. Subcutaneous abdominal adipose tissue biopsies were obtained to analyse the transcriptomics patterns of the isolated adipocytes as well as of the whole adipose tissue. Mitochondrial DNA transcript levels in adipocytes were measured by quantitative real-time PCR. Western blots of oxidative phosphorylation (OXPHOS) protein levels in adipocytes were performed in obese and lean unrelated individuals. RESULTS The heavier (BMI 29.9 ± 1.0 kg/m2) co-twins of the discordant twin pairs had more subcutaneous, intra-abdominal and liver fat and were more insulin resistant (p < 0.01 for all measures) than the lighter (24.1 ± 0.9 kg/m2) co-twins. Altogether, 2538 genes in adipocytes and 2135 in adipose tissue were significantly differentially expressed (nominal p < 0.05) between the co-twins. Pathway analysis of these transcripts in both isolated adipocytes and adipose tissue revealed that the heavier co-twins displayed reduced expression of genes relating to mitochondrial pathways, a result that was replicated when analysing the pathways behind the most consistently downregulated genes in the heavier co-twins (in at least 12 out of 14 pairs). Consistently upregulated genes in adipocytes were related to inflammation. We confirmed that mitochondrial DNA transcript levels (12S RNA, 16S RNA, COX1, ND5, CYTB), expression of mitochondrial ribosomal protein transcripts and a major mitochondrial regulator PGC-1α (also known as PPARGC1A) were reduced in the heavier co-twins' adipocytes (p < 0.05). OXPHOS protein levels of complexes I and III in adipocytes were lower in obese than in lean individuals. CONCLUSIONS/INTERPRETATION Subcutaneous abdominal adipocytes in obesity show global expressional downregulation of oxidative pathways, mitochondrial transcripts and OXPHOS protein levels and upregulation of inflammatory pathways. DATA AVAILABILITY The datasets analysed and generated during the current study are available in the figshare repository, https://dx.doi.org/10.6084/m9.figshare.3806286.v1.
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Affiliation(s)
- Sini Heinonen
- Obesity Research Unit, Research Programs Unit, Diabetes and Obesity, University of Helsinki, Biomedicum Helsinki, C424b, P.O. Box 63, Haartmaninkatu 8, 00014, Helsinki, Finland
| | - Maheswary Muniandy
- Obesity Research Unit, Research Programs Unit, Diabetes and Obesity, University of Helsinki, Biomedicum Helsinki, C424b, P.O. Box 63, Haartmaninkatu 8, 00014, Helsinki, Finland
| | - Jana Buzkova
- Research Programs Unit, Molecular Neurology, Biomedicum Helsinki, University of Helsinki, Helsinki, Finland
| | - Adil Mardinoglu
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
- Science for Life Laboratory, KTH - Royal Institute of Technology, Stockholm, Sweden
| | - Amaia Rodríguez
- Metabolic Research Laboratory, Clínica Universidad de Navarra, Pamplona, Spain
- CIBEROBN, Instituto de Salud Carlos III, Pamplona, Spain
| | - Gema Frühbeck
- Metabolic Research Laboratory, Clínica Universidad de Navarra, Pamplona, Spain
- CIBEROBN, Instituto de Salud Carlos III, Pamplona, Spain
| | - Antti Hakkarainen
- HUS Medical Imaging Center, Radiology, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Jesper Lundbom
- HUS Medical Imaging Center, Radiology, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany
| | - Nina Lundbom
- HUS Medical Imaging Center, Radiology, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Jaakko Kaprio
- FIMM, Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland
- Finnish Twin Cohort Study, Department of Public Health, University of Helsinki, Helsinki, Finland
- National Institute for Health and Welfare, Department of Health, Helsinki, Finland
| | - Aila Rissanen
- Obesity Research Unit, Research Programs Unit, Diabetes and Obesity, University of Helsinki, Biomedicum Helsinki, C424b, P.O. Box 63, Haartmaninkatu 8, 00014, Helsinki, Finland
- Department of Psychiatry, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Kirsi H Pietiläinen
- Obesity Research Unit, Research Programs Unit, Diabetes and Obesity, University of Helsinki, Biomedicum Helsinki, C424b, P.O. Box 63, Haartmaninkatu 8, 00014, Helsinki, Finland.
- FIMM, Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland.
- Endocrinology, Abdominal Center, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland.
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23
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Kogelman LJ, Fu J, Franke L, Greve JW, Hofker M, Rensen SS, Kadarmideen HN. Inter-Tissue Gene Co-Expression Networks between Metabolically Healthy and Unhealthy Obese Individuals. PLoS One 2016; 11:e0167519. [PMID: 27907186 DOI: 10.1371/journal.pone.0167519] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 11/15/2016] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Obesity is associated with severe co-morbidities such as type 2 diabetes and nonalcoholic steatohepatitis. However, studies have shown that 10-25 percent of the severely obese individuals are metabolically healthy. To date, the identification of genetic factors underlying the metabolically healthy obese (MHO) state is limited. Systems genetics approaches have led to the identification of genes and pathways in complex diseases. Here, we have used such approaches across tissues to detect genes and pathways involved in obesity-induced disease development. METHODS Expression data of 60 severely obese individuals was accessible, of which 28 individuals were MHO and 32 were metabolically unhealthy obese (MUO). A whole genome expression profile of four tissues was available: liver, muscle, subcutaneous adipose tissue and visceral adipose tissue. Using insulin-related genes, we used the weighted gene co-expression network analysis (WGCNA) method to build within- and inter-tissue gene networks. We identified genes that were differentially connected between MHO and MUO individuals, which were further investigated by homing in on the modules they were active in. To identify potentially causal genes, we integrated genomic and transcriptomic data using an eQTL mapping approach. RESULTS Both IL-6 and IL1B were identified as highly differentially co-expressed genes across tissues between MHO and MUO individuals, showing their potential role in obesity-induced disease development. WGCNA showed that those genes were clustering together within tissues, and further analysis showed different co-expression patterns between MHO and MUO subnetworks. A potential causal role for metabolic differences under similar obesity state was detected for PTPRE, IL-6R and SLC6A5. CONCLUSIONS We used a novel integrative approach by integration of co-expression networks across tissues to elucidate genetic factors related to obesity-induced metabolic disease development. The identified genes and their interactions give more insight into the genetic architecture of obesity and the association with co-morbidities.
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24
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Shen Y, Zhou H, Jin W, Lee HJ. Acute exercise regulates adipogenic gene expression in white adipose tissue. Biol Sport 2016; 33:381-391. [PMID: 28090143 PMCID: PMC5143777 DOI: 10.5604/20831862.1224395] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 03/09/2016] [Accepted: 06/19/2016] [Indexed: 12/31/2022] Open
Abstract
White adipose tissue expansion is associated with both hypertrophy and hyperplasia of adipocytes. Exercise training results in adipocyte hypotrophy by activating lipolysis, but it is poorly understood whether exercise regulates adipogenesis by altering adipogenic gene expression. The purpose of this study was to evaluate the effect of a single bout of swimming exercise on adipogenic gene expression in white adipose tissue (WAT). Male C57BL/6J mice were divided into two groups: a sedentary control group and a 120-minute swimming exercise group. Immediately after acute exercise, adipogenic gene expression in WAT was analysed by RT-PCR, and tdTomato positive cells in WAT from UCP1-cre-tdTomato mice were observed under a confocal microscope. In epididymal white adipose tissue (eWAT), PPARγ2 and C/EBPα expression at the mRNA level was significantly decreased with high induction of Wnt10b and KLFs (KLF2, KLF3, KLF7, KLF6, KLF9 and KLF15), whereas PPARγ2, not C/EBPα, was decreased with high induction of Wnt6 and KLFs (KLF2, KLF3, KLF7, KLF6 and KLF9) in inguinal white adipose tissue (iWAT) after acute exercise. The expression of C/EBPβ and C/EBPδ was upregulated in both WATs with a high level of PGC-1α expression. Expression level of UCP1 was increased only in adipocytes of eWAT, while beige cell specific gene expression was comparable between groups and tdTomato positive cells were not found in WAT of UCP1-cre-tdTomato reporter mouse immediately after acute exercise. These results suggest that acute exercise suppresses adipogenic gene expression and may regulate thermogenesis by activating C/EBPβ, PGC-1α and UCP1 in WAT.
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Affiliation(s)
- Y Shen
- University of Science and Technology of China, Hefei 230026, China; Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - H Zhou
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - W Jin
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - H J Lee
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
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25
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Vivas Y, Díez-Hochleitner M, Izquierdo-Lahuerta A, Corrales P, Horrillo D, Velasco I, Martínez-García C, Campbell M, Sevillano J, Ricote M, Ros M, Ramos MP, Medina-Gomez G. Peroxisome proliferator activated receptor gamma 2 modulates late pregnancy homeostatic metabolic adaptations. Mol Med 2016; 22:724-736. [PMID: 27782293 DOI: 10.2119/molmed.2015.00262] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 10/14/2016] [Indexed: 12/18/2022] Open
Abstract
Pregnancy requires the adaptation of maternal energy metabolism including expansion and functional modifications of adipose tissue. Insulin resistance (IR), predominantly during late gestation, is a physiological metabolic adaptation that serves to support the metabolic demands of fetal growth. The molecular mechanisms underlying these adaptations are not fully understood and may contribute to gestational diabetes mellitus. Peroxisome proliferator-activated receptor gamma (PPARγ) controls adipogenesis, glucose and lipid metabolism and insulin sensitivity. The PPARγ2 isoform is mainly expressed in adipocytes and is thus likely to contribute to adipose tissue adaptation during late pregnancy. In the present study, we investigated the contribution of PPARγ2 to the metabolic adaptations occurring during the late phase of pregnancy in the context of IR. Using a model of late pregnancy in PPARγ2 knockout (KO) mice, we found that deletion of PPARγ2 exacerbated IR in association with lower serum adiponectin levels, increased body weight and enhanced lipid accumulation in liver. Lack of PPARγ2 provoked changes in the distribution of fat mass and preferentially prevented the expansion of the perigonadal depot while at the same time exacerbating inflammation. PPARγ2KO pregnant mice presented adipose tissue depot-dependent decreased expression of genes involved in lipid metabolism. Collectively, these data indicate that PPARγ2 is essential to promote healthy adipose tissue expansion and immune and metabolic functionality during pregnancy, contributing to the physiological adaptations that lead gestation to term.
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Affiliation(s)
- Yurena Vivas
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain
| | - Monica Díez-Hochleitner
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain.,Faculty of Pharmacy, University San Pablo-CEU, Carretera Boadilla del Monte, km 5.3, 28668 Madrid, Spain
| | - Adriana Izquierdo-Lahuerta
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain
| | - Patricia Corrales
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain
| | - Daniel Horrillo
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain
| | - Ismael Velasco
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain
| | - Cristina Martínez-García
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain
| | - Mark Campbell
- Metabolic Research Laboratories, Level 4, Institute of Metabolic Science, Box 289, Addenbrooke's Hospital, University of Cambridge, CB2 0QQ, UK
| | - Julio Sevillano
- Faculty of Pharmacy, University San Pablo-CEU, Carretera Boadilla del Monte, km 5.3, 28668 Madrid, Spain
| | - Mercedes Ricote
- National Center of Cardiovascular Research Carlos III (CNIC), Melchor Fernández Almagro 3, 28029 Madrid, Spain
| | - Manuel Ros
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain
| | - Maria Pilar Ramos
- Faculty of Pharmacy, University San Pablo-CEU, Carretera Boadilla del Monte, km 5.3, 28668 Madrid, Spain
| | - Gema Medina-Gomez
- University Rey Juan Carlos, Department of Basic Sciences of Health, Area of Biochemistry and Molecular Biology, Avda. de Atenas s/n, Alcorcon, 28922 Madrid, Spain.,MEMORISM Research Unit of University Rey Juan Carlos- Institute of Biomedical Research "Alberto Sols" (CSIC)
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26
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Heinl RE, Dhindsa DS, Mahlof EN, Schultz WM, Ricketts JC, Varghese T, Esmaeeli A, Allard-Ratick MP, Millard AJ, Kelli HM, Sandesara PB, Eapen DJ, Sperling L. Comprehensive Cardiovascular Risk Reduction and Cardiac Rehabilitation in Diabetes and the Metabolic Syndrome. Can J Cardiol 2016; 32:S349-S357. [PMID: 27692115 PMCID: PMC5320578 DOI: 10.1016/j.cjca.2016.07.507] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 06/23/2016] [Accepted: 07/08/2016] [Indexed: 02/06/2023] Open
Abstract
The epidemic of obesity has contributed to a growing burden of metabolic syndrome (MetS) and diabetes mellitus (DM) worldwide. MetS is defined as central obesity along with associated factors such as hypertriglyceridemia, low high-density lipoprotein cholesterol, hyperglycemia, and hypertension. MetS and DM are associated with significant cardiovascular morbidity and mortality. Healthy behavioural modification is the cornerstone for reducing the atherosclerotic cardiovascular disease burden in this population. Comprehensive, multidisciplinary cardiac rehabilitation (CR) programs reduce mortality and hospitalizations in patients with MetS and DM. Despite this benefit, patients with MetS and DM are less likely to attend and complete CR because of numerous barriers. Implementation of innovative CR delivery models might improve utilization of CR and cardiovascular outcomes in this high-risk population.
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Affiliation(s)
- Robert E Heinl
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Devinder S Dhindsa
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Elliot N Mahlof
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - William M Schultz
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Johnathan C Ricketts
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Tina Varghese
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Amirhossein Esmaeeli
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Marc P Allard-Ratick
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Anthony J Millard
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Heval M Kelli
- Division of Cardiology, Department of Medicine, Emory University, Atlanta, Georgia, USA
| | - Pratik B Sandesara
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Danny J Eapen
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA; Division of Cardiology, Department of Medicine, Emory University, Atlanta, Georgia, USA
| | - Laurence Sperling
- Division of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA; Division of Cardiology, Department of Medicine, Emory University, Atlanta, Georgia, USA.
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27
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Gumbilai V, Ebihara K, Aizawa-Abe M, Ebihara C, Zhao M, Yamamoto Y, Mashimo T, Hosoda K, Serikawa T, Nakao K. Fat Mass Reduction With Adipocyte Hypertrophy and Insulin Resistance in Heterozygous PPARγ Mutant Rats. Diabetes 2016; 65:2954-65. [PMID: 27381370 DOI: 10.2337/db15-1422] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 06/30/2016] [Indexed: 11/13/2022]
Abstract
Agonist-induced activation of peroxisome proliferator-activated receptor-γ (PPARγ) stimulates adipocyte differentiation and insulin sensitivity. Patients with heterozygous PPARγ dominant-negative mutation develop partial lipodystrophy and insulin resistance. Inconsistent with this evidence in humans, it was reported that heterozygous PPARγ knockout mice have increased insulin sensitivity and that mice with heterozygous PPARγ dominant-negative mutation have normal insulin sensitivity and improved glucose tolerance. In the context of the interspecies intranslatability of PPARγ-related findings, we generated a PPARγ mutant rat with a loss-of-function mutation (Pparg(mkyo)) without dominant-negative activity by using the ENU (N-ethyl-N-nitrosourea) mutagenesis method. Heterozygous Pparg(mkyo/+) rats showed reduced fat mass with adipocyte hypertrophy and insulin resistance, which were highly predictable from known actions of PPARγ agonists and phenotypes of patients with the PPARγ mutation. This report is the first in our knowledge to clearly demonstrate that both alleles of PPARγ are required for normal adipocyte development and insulin sensitivity in vivo. Furthermore, the study indicates that PPARγ regulates mainly adipocyte number rather than adipocyte size in vivo. The choice of appropriate species as experimental models is critical, especially for the study of PPARγ.
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Affiliation(s)
- Valentino Gumbilai
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Ken Ebihara
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan Institute for Advancement of Clinical and Translational Science, Kyoto University Hospital, Kyoto, Japan Division of Endocrinology and Metabolism, Jichi Medical University, Tochigi, Japan
| | - Megumi Aizawa-Abe
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan Institute for Advancement of Clinical and Translational Science, Kyoto University Hospital, Kyoto, Japan
| | - Chihiro Ebihara
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan Division of Endocrinology and Metabolism, Jichi Medical University, Tochigi, Japan
| | - Mingming Zhao
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Yuji Yamamoto
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Tomoji Mashimo
- Institute of Laboratory Animals, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Kiminori Hosoda
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan Institute for Advancement of Clinical and Translational Science, Kyoto University Hospital, Kyoto, Japan Department of Health and Science, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Tadao Serikawa
- Institute of Laboratory Animals, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Kazuwa Nakao
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan Medical Innovation Center, Kyoto University Graduate School of Medicine, Kyoto, Japan
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Simeone TA, Matthews SA, Samson KK, Simeone KA. Regulation of brain PPARgamma2 contributes to ketogenic diet anti-seizure efficacy. Exp Neurol 2016; 287:54-64. [PMID: 27527983 DOI: 10.1016/j.expneurol.2016.08.006] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 08/05/2016] [Accepted: 08/11/2016] [Indexed: 12/23/2022]
Abstract
The ketogenic diet (KD) is an effective therapy primarily used in pediatric patients whom are refractory to current anti-seizure medications. The mechanism of the KD is not completely understood, but is thought to involve anti-inflammatory and anti-oxidant processes. The nutritionally-regulated transcription factor peroxisome proliferator activated receptor gamma, PPARγ, regulates genes involved in anti-inflammatory and anti-oxidant pathways. Moreover, endogenous ligands of PPARγ include fatty acids suggesting a potential role in the effects of the KD. Here, we tested the hypothesis that PPARγ contributes to the anti-seizure efficacy of the KD. We found that the KD increased nuclear protein content of the PPARγ2 splice variant by 2-4 fold (P<0.05) in brain homogenates from wild-type (WT) and epileptic Kv1.1 knockout (KO) mice, while not affecting PPARγ1. The KD reduced the frequency of seizures in Kv1.1KO mice by ~70% (P<0.01). GW9662, a PPARγ antagonist, prevented KD-mediated changes in PPARγ2 expression and prevented the anti-seizure efficacy of the KD in Kv1.1KO mice. Further supporting the association of PPARγ2 in mediating KD actions, the KD significantly prolonged the latency to flurothyl-induced seizure in WT mice by ~20-35% (P<0.01), but was ineffective in PPARγ2KO mice and neuron-specific PPARγKO mice. Finally, administering the PPARγ agonist pioglitazone increased PPARγ2 expression by 2-fold (P<0.01) and reduced seizures in Kv1.1KO mice by ~80% (P<0.01). Our findings implicate brain PPARγ2 among the mechanisms by which the KD reduces seizures and strongly support the development of PPARγ2 as a therapeutic target for severe, refractory epilepsy.
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Affiliation(s)
- Timothy A Simeone
- Creighton University, School of Medicine, Department of Pharmacology, Omaha, NE 68174, USA.
| | - Stephanie A Matthews
- Creighton University, School of Medicine, Department of Pharmacology, Omaha, NE 68174, USA
| | - Kaeli K Samson
- Creighton University, School of Medicine, Department of Pharmacology, Omaha, NE 68174, USA
| | - Kristina A Simeone
- Creighton University, School of Medicine, Department of Pharmacology, Omaha, NE 68174, USA
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Gesta S, Guntur K, Majumdar ID, Akella S, Vishnudas VK, Sarangarajan R, Narain NR. Reduced expression of collagen VI alpha 3 (COL6A3) confers resistance to inflammation-induced MCP1 expression in adipocytes. Obesity (Silver Spring) 2016; 24:1695-703. [PMID: 27312141 DOI: 10.1002/oby.21565] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 04/04/2016] [Accepted: 04/11/2016] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Collagen VI alpha 3 (COL6A3) is associated with insulin resistance and adipose tissue inflammation. In this study, the role of COL6A3 in human adipocyte function was characterized. METHODS Immortalized human preadipocyte cell lines stably expressing control or COL6A3 shRNA were used to study adipocyte function and inflammation. RESULTS COL6A3 knockdown increased triglyceride content, lipolysis, insulin-induced Akt phosphorylation, and mRNA expression of key adipogenic genes (peroxisome proliferator-activated receptor-γ, glucose transporter, adiponectin, and fatty acid binding protein), indicating increased adipocyte function and insulin sensitivity. However, COL6A3 knockdown decreased basal adipocyte chemokine (C-C motif) ligand 2 [CCL2, monocyte chemoattractant protein (MCP1)] mRNA expression, reduced secreted protein levels, and abrogated tumor necrosis factor-α- and lipopolysaccharide-induced MCP1 mRNA expression. In addition, while control adipocytes co-cultured with THP1 macrophages showed a threefold increase in adipocyte MCP1 mRNA expression, in COL6A3 knockdown adipocytes MCP1 mRNA expression was unaltered by co-culturing. Lastly, in normal differentiated adipocytes, matrix metalloproteinase-11 treatment reduced expression of COL6A3 protein, MCP1 mRNA, MCP1 secretion, and abrogated tumor necrosis factor-α- and lipopolysaccharide-induced MCP1 mRNA expression and protein secretion. CONCLUSIONS COL6A3 knockdown in adipocytes leads to the development of a unique state of inflammatory resistance via suppression of MCP1 induction.
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Pap A, Cuaranta-Monroy I, Peloquin M, Nagy L. Is the Mouse a Good Model of Human PPARγ-Related Metabolic Diseases? Int J Mol Sci 2016; 17:E1236. [PMID: 27483259 DOI: 10.3390/ijms17081236] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 07/19/2016] [Accepted: 07/21/2016] [Indexed: 12/21/2022] Open
Abstract
With the increasing number of patients affected with metabolic diseases such as type 2 diabetes, obesity, atherosclerosis and insulin resistance, academic researchers and pharmaceutical companies are eager to better understand metabolic syndrome and develop new drugs for its treatment. Many studies have focused on the nuclear receptor peroxisome proliferator-activated receptor gamma (PPARγ), which plays a crucial role in adipogenesis and lipid metabolism. These studies have been able to connect this transcription factor to several human metabolic diseases. Due to obvious limitations concerning experimentation in humans, animal models—mainly mouse models—have been generated to investigate the role of PPARγ in different tissues. This review focuses on the metabolic features of human and mouse PPARγ-related diseases and the utility of the mouse as a model.
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Sauer S. Ligands for the Nuclear Peroxisome Proliferator-Activated Receptor Gamma. Trends Pharmacol Sci 2016; 36:688-704. [PMID: 26435213 DOI: 10.1016/j.tips.2015.06.010] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 06/29/2015] [Accepted: 06/30/2015] [Indexed: 01/09/2023]
Abstract
Nuclear receptors are ligand-activated transcription factors, which represent a primary class of drug targets. The nuclear receptor peroxisome proliferator-activated receptor gamma (PPARγ) is a key player in various biological processes. PPARγ is widely known as the target protein of the thiazolidinediones for treating type 2 diabetes. Moreover, PPARγ ligands can induce anti-inflammatory and potentially additional beneficial effects. Recent mechanistic insights of PPARγ modulation give hope the next generation of efficient PPARγ-based drugs with fewer side effects can be developed. Furthermore, chemical approaches that make use of synergistic action of combinatorial ligands are promising alternatives for providing tailored medicine. Lessons learned from fine-tuning the action of PPARγ can provide avenues for efficient molecular intervention via many other nuclear receptors to combat common diseases.
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Affiliation(s)
- Sascha Sauer
- Otto-Warburg Laboratory, Max Planck Institute for Molecular Genetics, Ihnestrasse 73, 14195 Berlin, Germany; University of Würzburg, CU Systems Medicine, Josef-Schneider-Straße 2, Building D15, 97070 Wuerzburg, Germany.
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Hallenborg P, Petersen RK, Kouskoumvekaki I, Newman JW, Madsen L, Kristiansen K. The elusive endogenous adipogenic PPARγ agonists: Lining up the suspects. Prog Lipid Res 2016; 61:149-62. [DOI: 10.1016/j.plipres.2015.11.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 11/06/2015] [Accepted: 11/10/2015] [Indexed: 02/07/2023]
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Pihlajamäki J, Schwab U, Kaminska D, Ågren J, Kuusisto J, Kolehmainen M, Paananen J, Laakso M, Uusitupa M. Dietary polyunsaturated fatty acids and the Pro12Ala polymorphisms of PPARG regulate serum lipids through divergent pathways: a randomized crossover clinical trial. Genes Nutr 2015; 10:43. [PMID: 26446033 DOI: 10.1007/s12263-015-0493-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 09/25/2015] [Indexed: 02/05/2023]
Abstract
Human and animal studies suggest an interaction between the Pro12Ala polymorphism of PPARG and dietary fat. In this randomized crossover clinical trial, we investigated whether subjects with the Pro12Pro and Ala12Ala genotypes of PPARG respond differently to a diet supplemented with high saturated (SAFA) or polyunsaturated fatty acid (PUFA).We recruited non-diabetic men from a population-based METSIM study (including 10,197 men) to obtain men with the Ala12Ala and the Pro12Pro genotypes matched for age and body mass index. Seventeen men with the Pro12Pro genotype and 14 with the Ala12Ala genotype were randomized to both a PUFA diet and a SAFA diet for 8 weeks in a crossover setting. Serum lipids and adipose tissue mRNA expression were measured during the diet intervention. At baseline, subjects with the Ala12Ala genotype had higher levels of HDL cholesterol and lower levels of LDL cholesterol, total triglycerides, and apolipoprotein B compared to those subjects with the Pro12Pro genotype (P < 0.05, FDR < 0.1). The Ala12Ala genotype also associated with higher mRNA expression of PPARG2, LPIN1, and SREBP-1c compared to participants with the Pro12Pro genotype (FDR < 0.001). On the other hand, PUFA diet resulted in lower levels of fasting glucose, total cholesterol, total triglycerides, and apolipoprotein B (P < 0.05, FDR < 0.1) but did not affect PPARG2 mRNA expression in adipose tissue. We conclude that individuals with the Pro12Pro genotype, with higher triglyceride levels at baseline, are more likely to benefit from the PUFA diet. However, the beneficial effects of dietary PUFA and the Ala12Ala genotype of PPARG on serum lipids are mediated through divergent mechanisms.
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Affiliation(s)
- Jussi Pihlajamäki
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70210, Kuopio, Finland. .,Department of Clinical Nutrition and Obesity Center, Kuopio University Hospital, Kuopio, Finland.
| | - Ursula Schwab
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70210, Kuopio, Finland.,Department of Clinical Nutrition and Obesity Center, Kuopio University Hospital, Kuopio, Finland
| | - Dorota Kaminska
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70210, Kuopio, Finland
| | - Jyrki Ågren
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Johanna Kuusisto
- Department of Medicine, Kuopio University Hospital, University of Eastern Finland, Kuopio, Finland
| | - Marjukka Kolehmainen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70210, Kuopio, Finland
| | - Jussi Paananen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70210, Kuopio, Finland
| | - Markku Laakso
- Department of Medicine, Kuopio University Hospital, University of Eastern Finland, Kuopio, Finland
| | - Matti Uusitupa
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70210, Kuopio, Finland.,Research Unit, Kuopio University Hospital, Kuopio, Finland
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Amaral CL, Crisma AR, Masi LN, Martins AR, Hirabara SM, Curi R. DNA Methylation Changes Induced by a High-Fat Diet and Fish Oil Supplementation in the Skeletal Muscle of Mice. J Nutrigenet Nutrigenomics 2015; 7:314-26. [PMID: 26022801 DOI: 10.1159/000381777] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 03/17/2015] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS To investigate the global changes in DNA methylation and methylation of the promoter region of the peroxisome proliferator-activated receptor gamma transcript variant 2 (Pparg2) gene resulting from a high-fat diet (HFD) and/or fish oil supplementation. METHODS Fish oil, rich in omega-3 polyunsaturated fatty acids, or water was orally administered to male mice for 12 weeks. After the first 4 weeks, the animals were fed a control diet or an HFD until the end of the experimental protocol, when the epididymal fat, gastrocnemius muscle and liver were excised. RESULTS Pparg2 mRNA expression was upregulated by obesity and downregulated by fish oil supplementation in the liver. In the gastrocnemius muscle, diet-induced obesity increased global DNA methylation. Fish oil prevented the decrease in Pparg2 promoter methylation induced by obesity in the gastrocnemius muscle. Regardless of the diet given, fish oil supplementation increased Pparg2 promoter methylation at CpG-263 in muscle and adipose tissue. CONCLUSION HFD and fish oil modified global and Pparg2 promoter DNA methylation in a tissue-specific manner. Fish oil supplementation attenuated body weight gain, abolished the increase in Pparg2 expression in the liver and prevented the decrease in Pparg2 promoter methylation in the muscle induced by the HFD.
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Affiliation(s)
- Catia L Amaral
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
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Parham KA, Zebol JR, Tooley KL, Sun WY, Moldenhauer LM, Cockshell MP, Gliddon BL, Moretti PA, Tigyi G, Pitson SM, Bonder CS. Sphingosine 1-phosphate is a ligand for peroxisome proliferator-activated receptor-γ that regulates neoangiogenesis. FASEB J 2015; 29:3638-53. [PMID: 25985799 DOI: 10.1096/fj.14-261289] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 05/04/2015] [Indexed: 12/21/2022]
Abstract
Sphingosine 1-phosphate (S1P) is a bioactive lipid that can function both extracellularly and intracellularly to mediate a variety of cellular processes. Using lipid affinity matrices and a radiolabeled lipid binding assay, we reveal that S1P directly interacts with the transcription factor peroxisome proliferator-activated receptor (PPAR)γ. Herein, we show that S1P treatment of human endothelial cells (ECs) activated a luciferase-tagged PPARγ-specific gene reporter by ∼12-fold, independent of the S1P receptors. More specifically, in silico docking, gene reporter, and binding assays revealed that His323 of the PPARγ ligand binding domain is important for binding to S1P. PPARγ functions when associated with coregulatory proteins, and herein we identify that peroxisome proliferator-activated receptor-γ coactivator 1 (PGC1)β binds to PPARγ in ECs and their progenitors (nonadherent endothelial forming cells) and that the formation of this PPARγ:PGC1β complex is increased in response to S1P. ECs treated with S1P selectively regulated known PPARγ target genes with PGC1β and plasminogen-activated inhibitor-1 being increased, no change to adipocyte fatty acid binding protein 2 and suppression of CD36. S1P-induced in vitro tube formation was significantly attenuated in the presence of the PPARγ antagonist GW9662, and in vivo application of GW9662 also reduced vascular development in Matrigel plugs. Interestingly, activation of PPARγ by the synthetic ligand troglitazone also reduced tube formation in vitro and in vivo. To support this, Sphk1(-/-)Sphk2(+/-) mice, with low circulating S1P levels, demonstrated a similar reduction in vascular development. Taken together, our data reveal that the transcription factor, PPARγ, is a bona fide intracellular target for S1P and thus suggest that the S1P:PPARγ:PGC1β complex may be a useful target to manipulate neovascularization.
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Affiliation(s)
- Kate A Parham
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Julia R Zebol
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Katie L Tooley
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Wai Y Sun
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Lachlan M Moldenhauer
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Michaelia P Cockshell
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Briony L Gliddon
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Paul A Moretti
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Gabor Tigyi
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Stuart M Pitson
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Claudine S Bonder
- *Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, South Australia, Australia; School of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Co-operative Research Centre for Biomarker Translation, La Trobe University, Melbourne, Victoria, Australia; and Department of Physiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
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Abstract
Brown adipose tissue (BAT) is a specialized organ responsible for thermogenesis, a process required for maintaining body temperature. BAT is regulated by the sympathetic nervous system (SNS), which activates lipolysis and mitochondrial uncoupling in brown adipocytes. For many years, BAT was considered to be important only in small mammals and newborn humans, but recent data have shown that BAT is also functional in adult humans. On the basis of this evidence, extensive research has been focused on BAT function, where new molecules, such as irisin and bone morphogenetic proteins, particularly BMP7 and BMP8B, as well as novel central factors and new regulatory mechanisms, such as orexins and the canonical ventomedial nucleus of the hypothalamus (VMH) AMP- activated protein kinase (AMPK)-SNS-BAT axis, have been discovered and emerged as potential drug targets to combat obesity. In this review we provide an overview of the complex central regulation of BAT and how different neuronal cell populations co-ordinately work to maintain energy homeostasis.
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Affiliation(s)
- Cristina Contreras
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria , Santiago de Compostela, 15782 , Spain
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Delint-Ramirez I, Maldonado Ruiz R, Torre-Villalvazo I, Fuentes-Mera L, Garza Ocañas L, Tovar A, Camacho A. Genetic obesity alters recruitment of TANK-binding kinase 1 and AKT into hypothalamic lipid rafts domains. Neurochem Int 2015; 80:23-32. [DOI: 10.1016/j.neuint.2014.11.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 10/31/2014] [Accepted: 11/04/2014] [Indexed: 10/24/2022]
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Beekmann K, Rubió L, de Haan LHJ, Actis-Goretta L, van der Burg B, van Bladeren PJ, Rietjens IMCM. The effect of quercetin and kaempferol aglycones and glucuronides on peroxisome proliferator-activated receptor-gamma (PPAR-γ). Food Funct 2015; 6:1098-107. [DOI: 10.1039/c5fo00076a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Quercetin and kaempferol increase PPAR-γ mediated gene expression without acting as agonistic ligands; glucuronidation reduces their activity in cell-based assays.
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Affiliation(s)
- Karsten Beekmann
- Division of Toxicology
- Wageningen University
- 6700EA Wageningen
- The Netherlands
| | - Laura Rubió
- Department of Food Technology
- XaRTA-UTPV
- Escola Tècnica Superior d'Enginyeria Agrària
- Universitat de Lleida
- 25198 Lleida
| | | | | | | | - Peter J. van Bladeren
- Division of Toxicology
- Wageningen University
- 6700EA Wageningen
- The Netherlands
- Nestlé Research Center
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Abstract
The maintenance of energy balance is regulated by complex homeostatic mechanisms, including those emanating from adipose tissue. The main function of the adipose tissue is to store the excess of metabolic energy in the form of fat. The energy stored as fat can be mobilized during periods of energy deprivation (hunger, fasting, diseases). The adipose tissue has also a homeostatic role regulating energy balance and functioning as endocrine organ that secretes substances that control body homeostasis. Two adipose tissues have been identified: white and brown adipose tissues (WAT and BAT) with different phenotype, function and regulation. WAT stores energy, while BAT dissipates energy as heat. Brown and white adipocytes have different ontogenetic origin and lineage and specific markers of WAT and BAT have been identified. “Brite” or beige adipose tissue has been identified in WAT with some properties of BAT. Thyroid hormones exert pleiotropic actions, regulating the differentiation process in many tissues including the adipose tissue. Adipogenesis gives raise to mature adipocytes and is regulated by several transcription factors (c/EBPs, PPARs) that coordinately activate specific genes, resulting in the adipocyte phenotype. T3 regulates several genes involved in lipid mobilization and storage and in thermogenesis. Both WAT and BAT are targets of thyroid hormones, which regulate genes crucial for their proper function: lipogenesis, lipolysis, thermogenesis, mitochondrial function, transcription factors, the availability of nutrients. T3 acts directly through specific TREs in the gene promoters, regulating transcription factors. The deiodinases D3, D2, and D1 regulate the availability of T3. D3 is activated during proliferation, while D2 is linked to the adipocyte differentiation program, providing T3 needed for lipogenesis and thermogenesis. We examine the differences between BAT, WAT and brite/beige adipocytes and the process that lead to activation of UCP1 in WAT and the presence of BAT in humans and its relevance.
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Affiliation(s)
- Maria-Jesus Obregon
- Department of Molecular Physiopathology, Instituto de Investigaciones Biomedicas "Alberto Sols" (IIBM), Consejo Superior de Investigaciones Cientificas and Universidad Autonoma de Madrid Madrid, Spain
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Cantley JL, Vatner DF, Galbo T, Madiraju A, Petersen M, Perry RJ, Kumashiro N, Guebre-Egziabher F, Gattu AK, Stacy MR, Dione DP, Sinusas AJ, Ragolia L, Hall CE, Manchem VP, Bhanot S, Bogan JS, Samuel VT. Targeting steroid receptor coactivator 1 with antisense oligonucleotides increases insulin-stimulated skeletal muscle glucose uptake in chow-fed and high-fat-fed male rats. Am J Physiol Endocrinol Metab 2014; 307:E773-83. [PMID: 25159329 PMCID: PMC4216948 DOI: 10.1152/ajpendo.00148.2014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The steroid receptor coactivator 1 (SRC1) regulates key metabolic pathways, including glucose homeostasis. SRC1(-/-) mice have decreased hepatic expression of gluconeogenic enzymes and a reduction in the rate of endogenous glucose production (EGP). We sought to determine whether decreasing hepatic and adipose SRC1 expression in normal adult rats would alter glucose homeostasis and insulin action. Regular chow-fed and high-fat-fed male Sprage-Dawley rats were treated with an antisense oligonucleotide (ASO) against SRC1 or a control ASO for 4 wk, followed by metabolic assessments. SRC1 ASO did not alter basal EGP or expression of gluconeogenic enzymes. Instead, SRC1 ASO increased insulin-stimulated whole body glucose disposal by ~30%, which was attributable largely to an increase in insulin-stimulated muscle glucose uptake. This was associated with an approximately sevenfold increase in adipose expression of lipocalin-type prostaglandin D2 synthase, a previously reported regulator of insulin sensitivity, and an approximately 70% increase in plasma PGD2 concentration. Muscle insulin signaling, AMPK activation, and tissue perfusion were unchanged. Although GLUT4 content was unchanged, SRC1 ASO increased the cleavage of tether-containing UBX domain for GLUT4, a regulator of GLUT4 translocation. These studies point to a novel role of adipose SRC1 as a regulator of insulin-stimulated muscle glucose uptake.
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Affiliation(s)
- Jennifer L Cantley
- Howard Hughes Medical Institute and Departments of Internal Medicine and
| | | | | | | | | | | | - Naoki Kumashiro
- Howard Hughes Medical Institute and Departments of Internal Medicine and
| | | | - Arijeet K Gattu
- Departments of Internal Medicine and West Haven Veterans Affairs Medical Center, West Haven, Connecticut
| | | | | | | | - Louis Ragolia
- Vascular Biology Institute, Winthrop-University Hospital, Mineola, New York
| | - Christopher E Hall
- Vascular Biology Institute, Winthrop-University Hospital, Mineola, New York
| | | | | | - Jonathan S Bogan
- Departments of Internal Medicine and Cell Biology, Yale School of Medicine, New Haven, Connecticut
| | - Varman T Samuel
- Departments of Internal Medicine and West Haven Veterans Affairs Medical Center, West Haven, Connecticut;
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Charalambous M, Da Rocha ST, Radford EJ, Medina-Gomez G, Curran S, Pinnock SB, Ferrón SR, Vidal-Puig A, Ferguson-Smith AC. DLK1/PREF1 regulates nutrient metabolism and protects from steatosis. Proc Natl Acad Sci U S A 2014; 111:16088-93. [PMID: 25349437 DOI: 10.1073/pnas.1406119111] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is associated with insulin resistance and obesity, as well as progressive liver dysfunction. Recent animal studies have underscored the importance of hepatic growth hormone (GH) signaling in the development of NAFLD. The imprinted Delta-like homolog 1 (Dlk1)/preadipocyte factor 1 (Pref1) gene encodes a complex protein producing both circulating and membrane-tethered isoforms whose expression dosage is functionally important because even modest elevation during embryogenesis causes lethality. DLK1 is up-regulated during embryogenesis, during suckling, and in the mother during pregnancy. We investigated the normal role for elevated DLK1 dosage by overexpressing Dlk1 from endogenous control elements. This increased DLK1 dosage caused improved glucose tolerance with no primary defect in adipose tissue expansion even under extreme metabolic stress. Rather, Dlk1 overexpression caused reduced fat stores, pituitary insulin-like growth factor 1 (IGF1) resistance, and a defect in feedback regulation of GH. Increased circulatory GH culminated in a switch in whole body fuel metabolism and a reduction in hepatic steatosis. We propose that the function of DLK1 is to shift the metabolic mode of the organism toward peripheral lipid oxidation and away from lipid storage, thus mediating important physiological adaptations associated with early life and with implications for metabolic disease resistance.
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Ortega FJ, Serrano M, Rodriguez-Cuenca S, Moreno-Navarrete JM, Gómez-Serrano M, Sabater M, Rodriguez-Hermosa JI, Xifra G, Ricart W, Peral B, Vidal-Puig A, Fernández-Real JM. Transducin-like enhancer of split 3 (TLE3) in adipose tissue is increased in situations characterized by decreased PPARγ gene expression. J Mol Med (Berl) 2014; 93:83-92. [PMID: 25249007 DOI: 10.1007/s00109-014-1207-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 08/26/2014] [Accepted: 09/02/2014] [Indexed: 01/14/2023]
Abstract
UNLABELLED Transgenic overexpression of adipose tissue (AT) transducin-like enhancer of split 3 (TLE3) mimicked peroxisome proliferator-activated receptor gamma (PPARγ) agonists, improving insulin resistance in mice. This study aimed to investigate TLE3 gene expression (qRT-PCR) and protein (Western blot) in subjects with a wide spectrum of obesity and insulin sensitivity and in an independent cohort of obese subjects following surgery-induced weight loss. TLE3 was analyzed in human adipocytes and after treatment with rosiglitazone. Given the findings in humans, TLE3 was also investigated in mice after a high-fat diet (HFD) and in PPARγ knockout mice. Subcutaneous (SC) AT TLE3 was increased in subjects with type 2 diabetes (T2D). In fact, SC TLE3 was associated with increased fasting glucose (r = 0.25, p = 0.015) and S6K1 activity (r = 0.671, p = 0.003), and with decreased Glut4 (r = -0.426, p = 0.006) and IRS-1 expression (-31 %, p = 0.007) and activation (P-IRS-1/IRS-1, -17 %, p = 0.024). TLE3 was preferentially expressed in mature adipocytes and increased during in vitro differentiation in parallel to PPARγ. Weight loss led to improved insulin sensitivity, increased AT PPARγ and decreased TLE3 (-24 %, p = 0.0002), while rosiglitazone administration downregulated TLE3 gene expression in fully differentiated adipocytes (-45 %, p < 0.0001). The concept that TLE3 may act as a homeostatic linchpin in AT was also supported by its increased expression in HFD-fed mice (39 %, p = 0.013) and PPARγ knockout (74 %, p = 0.001). In summary, increased AT TLE3 in subjects with T2D and in AT from HFD-fed and PPARγ knockout mice suggest that TLE3 may play an adaptive regulatory role that improves AT function under decreased PPARγ expression. KEY MESSAGE TLE3 is expressed in mature adipocytes concomitantly with PPARγ. Subcutaneous adipose TLE3 is increased in T2D patients. Adipose TLE3 is upregulated in genetically ablated PPARγ and HFD-fed mice. TLE3 may be a homeostatic linchpin in insulin resistance and defective PPARγ.
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Affiliation(s)
- Francisco José Ortega
- Department of Diabetes, Endocrinology and Nutrition (UDEN), Institut d'Investigació Biomèdica de Girona (IdIBGi), CIBERobn (CB06/03/010) and Instituto de Salud Carlos III (ISCIII), Carretera de França s/n, 17007, Girona, Spain,
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Dankel SN, Svärd J, Matthä S, Claussnitzer M, Klöting N, Glunk V, Fandalyuk Z, Grytten E, Solsvik MH, Nielsen HJ, Busch C, Hauner H, Blüher M, Skurk T, Sagen JV, Mellgren G. COL6A3 expression in adipocytes associates with insulin resistance and depends on PPARγ and adipocyte size. Obesity (Silver Spring) 2014; 22:1807-13. [PMID: 24719315 DOI: 10.1002/oby.20758] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 03/09/2014] [Accepted: 03/26/2014] [Indexed: 12/14/2022]
Abstract
OBJECTIVE COL6A3 may modulate adipose tissue function in obesity and insulin resistance. A role for human adipocytes linking COL6A3 with insulin resistance warrants exploration. METHODS COL6A3 mRNA in abdominal subcutaneous adipose samples was compared between (1) BMI-matched obese subjects resistant or sensitive to insulin (surgical whole tissue biopsies, n = 30/group), (2) lean/overweight and obese subjects (isolated adipocytes from collagenase-treated surgical biopsies, n = 11/group), (3) developing primary human adipocytes with/without knockdown of the insulin-sensitizing adipogenic gene PPARG (collagenase-treated lipoaspirate, n = 5), and (4) small and large adipocytes from lean/overweight subjects (collagenase-treated surgical biopsies or lipoaspirate, n = 10). Insulin resistance and sensitivity were assessed by euglycemic-hyperinsulinemic clamp (glucose infusion rate <60 and >70 μmol kg(-1) min(-1) , respectively) (1), or by HOMA-IR and TG/HDL ratio (2). RESULTS Whole tissue COL6A3 mRNA was 2.6-fold higher in insulin resistant compared to sensitive subjects (P < 0.001). In isolated adipocytes, COL6A3 mRNA correlated positively with BMI (P = 0.007), HOMA-IR (P = 0.039), and TG/HDL (P = 0.004). PPARG knockdown in developing adipocytes increased COL6A3 mRNA 1.5-fold (P = 0.043). The inverse relationship with adipocyte development was further supported by 2.8-fold higher COL6A3 mRNA in small compared to large adipocytes (P = 0.004). CONCLUSION Increased adipocyte COL6A3 expression associates with insulin resistance in humans, which may involve impaired PPARγ-mediated adipocyte development.
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Affiliation(s)
- Simon N Dankel
- Department of Clinical Science, University of Bergen, Bergen, Norway; KG Jebsen Center for Diabetes Research, Department of Clinical Science, University of Bergen, Bergen, Norway; Hormone Laboratory, Haukeland University Hospital, Bergen, Norway
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Luchetti F, Canonico B, Bartolini D, Arcangeletti M, Ciffolilli S, Murdolo G, Piroddi M, Papa S, Reiter RJ, Galli F. Melatonin regulates mesenchymal stem cell differentiation: a review. J Pineal Res 2014; 56:382-97. [PMID: 24650016 DOI: 10.1111/jpi.12133] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Accepted: 03/14/2014] [Indexed: 12/12/2022]
Abstract
Among the numerous functions of melatonin, the control of survival and differentiation of mesenchymal stem cells (MSCs) has been recently proposed. MSCs are a heterogeneous population of multipotent elements resident in tissues such as bone marrow, muscle, and adipose tissue, which are primarily involved in developmental and regeneration processes, gaining thus increasing interest for tissue repair and restoration therapeutic protocols. Receptor-dependent and receptor-independent responses to melatonin are suggested to occur in these cells. These involve antioxidant or redox-dependent functions of this indolamine as well as secondary effects resulting from autocrine and paracrine responses. Inflammatory cytokines and adipokines, proangiogenic/mitogenic stimuli, and other mediators that influence the differentiation processes may affect the survival and functional integrity of these mesenchymal precursor cells. In this scenario, melatonin seems to regulate signaling pathways that drive commitment and differentiation of MSC into osteogenic, chondrogenic, adipogenic, or myogenic lineages. Common pathways suggested to be involved as master regulators of these processes are the Wnt/β-catenin pathway, the MAPKs and the, TGF-β signaling. In this respect melatonin emerges a novel and potential modulator of MSC lineage commitment and adipogenic differentiation. These and other aspects of the physiological and pharmacological effects of melatonin as regulator of MSC are discussed in this review.
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Affiliation(s)
- Francesca Luchetti
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Urbino, Italy
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Seoane-Collazo P, Martínez de Morentin PB, Fernø J, Diéguez C, Nogueiras R, López M. Nicotine improves obesity and hepatic steatosis and ER stress in diet-induced obese male rats. Endocrinology 2014; 155:1679-89. [PMID: 24517227 DOI: 10.1210/en.2013-1839] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Nicotine, the main addictive component of tobacco, promotes body weight reduction in humans and rodents. Recent evidence has suggested that nicotine acts in the central nervous system to modulate energy balance. Specifically, nicotine modulates hypothalamic AMP-activated protein kinase to decrease feeding and to increase brown adipose tissue thermogenesis through the sympathetic nervous system, leading to weight loss. Of note, most of this evidence has been obtained in animal models fed with normal diet or low-fat diet (LFD). However, its effectiveness in obese models remains elusive. Because obesity causes resistance towards many factors involved in energy homeostasis, the aim of this study has been to compare the effect of nicotine in a diet-induced obese (DIO) model, namely rats fed a high-fat diet, with rats fed a LFD. Our data show that chronic peripheral nicotine treatment reduced body weight by decreasing food intake and increasing brown adipose tissue thermogenesis in both LFD and DIO rats. This overall negative energy balance was associated to decreased activation of hypothalamic AMP-activated protein kinase in both models. Furthermore, nicotine improved serum lipid profile, decreased insulin serum levels, as well as reduced steatosis, inflammation, and endoplasmic reticulum stress in the liver of DIO rats but not in LFD rats. Overall, this evidence suggests that nicotine diminishes body weight and improves metabolic disorders linked to DIO and might offer a clear-cut strategy to develop new therapeutic approaches against obesity and its metabolic complications.
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Affiliation(s)
- Patricia Seoane-Collazo
- Department of Physiology (P.S.-C., P.B.M.d.M., C.D., R.N., M.L.), NeuObesity Group, Centro singular de investigación en medicina molecular y enfermedades crónicas (CIMUS), University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela 15782, Spain; Centro de investigación biomédica en red Fisiopatología de la Obesidad y Nutrición (P.S.-C., P.B.M.d.M., C.D., R.N., M.L.), Santiago de Compostela 15706, Spain; and Department of Clinical Science (J.F.), University of Bergen, N-5020 Bergen, Norway
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Claussnitzer M, Dankel SN, Klocke B, Grallert H, Glunk V, Berulava T, Lee H, Oskolkov N, Fadista J, Ehlers K, Wahl S, Hoffmann C, Qian K, Rönn T, Riess H, Müller-Nurasyid M, Bretschneider N, Schroeder T, Skurk T, Horsthemke B, Spieler D, Klingenspor M, Seifert M, Kern MJ, Mejhert N, Dahlman I, Hansson O, Hauck SM, Blüher M, Arner P, Groop L, Illig T, Suhre K, Hsu YH, Mellgren G, Hauner H, Laumen H. Leveraging cross-species transcription factor binding site patterns: from diabetes risk loci to disease mechanisms. Cell 2014; 156:343-58. [PMID: 24439387 DOI: 10.1016/j.cell.2013.10.058] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Revised: 09/05/2013] [Accepted: 10/30/2013] [Indexed: 10/25/2022]
Abstract
Genome-wide association studies have revealed numerous risk loci associated with diverse diseases. However, identification of disease-causing variants within association loci remains a major challenge. Divergence in gene expression due to cis-regulatory variants in noncoding regions is central to disease susceptibility. We show that integrative computational analysis of phylogenetic conservation with a complexity assessment of co-occurring transcription factor binding sites (TFBS) can identify cis-regulatory variants and elucidate their mechanistic role in disease. Analysis of established type 2 diabetes risk loci revealed a striking clustering of distinct homeobox TFBS. We identified the PRRX1 homeobox factor as a repressor of PPARG2 expression in adipose cells and demonstrate its adverse effect on lipid metabolism and systemic insulin sensitivity, dependent on the rs4684847 risk allele that triggers PRRX1 binding. Thus, cross-species conservation analysis at the level of co-occurring TFBS provides a valuable contribution to the translation of genetic association signals to disease-related molecular mechanisms.
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Affiliation(s)
- Melina Claussnitzer
- Chair of Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany; Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany and Technische Universität München, 85350 Freising-Weihenstephan, Germany; Hebrew SeniorLife Institute for Aging Research, Harvard Medical School, Boston, MA 02131, USA.
| | - Simon N Dankel
- Department of Clinical Science, University of Bergen, 5021 Bergen, Norway; K.G. Jebsen Center for Diabetes Research, Department of Clinical Science, University of Bergen, N-5021 Bergen, Norway; Hormone Laboratory, Haukeland University Hospital, 5021 Bergen, Norway
| | | | - Harald Grallert
- German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Viktoria Glunk
- Chair of Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany; Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany and Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Tea Berulava
- Institut für Humangenetik, Universitätsklinikum Essen, Universität-Duisburg-Essen, 45147 Essen, Germany
| | - Heekyoung Lee
- Chair of Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany; Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany and Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Nikolay Oskolkov
- Diabetes and Endocrinology Research Unit, Department of Clinical Sciences, Lund University, Malmö 20502, Sweden
| | - Joao Fadista
- Diabetes and Endocrinology Research Unit, Department of Clinical Sciences, Lund University, Malmö 20502, Sweden
| | - Kerstin Ehlers
- Chair of Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany; Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany and Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Simone Wahl
- German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Christoph Hoffmann
- Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; Chair of Molecular Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany
| | - Kun Qian
- Chair of Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany; Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany and Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Tina Rönn
- Diabetes and Endocrinology Research Unit, Department of Clinical Sciences, Lund University, Malmö 20502, Sweden
| | - Helene Riess
- Department of Internal Medicine II-Cardiology, University of Ulm Medical Center, 89081 Ulm, Germany; Institute of Epidemiology II, Helmholtz Zentrum München-German Research Center for Environmental Health, 85764 Neuherberg, Germany
| | - Martina Müller-Nurasyid
- Institute of Genetic Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, 85764 Neuherberg, Germany; Department of Medicine I, University Hospital Grosshadern, Ludwig-Maximilians-Universität, 81377 Munich, Germany; Institute of Medical Informatics, Biometry and Epidemiology, Chair of Genetic Epidemiology, Ludwig-Maximilians-Universität, 81377 Munich, Germany
| | | | - Timm Schroeder
- Research Unit Stem Cell Dynamics, Helmholtz Center Munich-German Research Center for Environmental Health GmbH, 85764 Neuherberg, Germany; Department of Biosystems Science and Engineering (D-BSSE), ETH Zurich, 4058 Basel, Switzerland
| | - Thomas Skurk
- Chair of Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany; Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; Else Kröner-Fresenius-Center for Nutritional Medicine, Klinikum rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Bernhard Horsthemke
- Institut für Humangenetik, Universitätsklinikum Essen, Universität-Duisburg-Essen, 45147 Essen, Germany
| | | | - Derek Spieler
- Institute of Human Genetics, Helmholtz Zentrum München, 85764 Neuherberg, German Research Center for Environmental Health, Germany; Department of Neurology, Klinikum rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Martin Klingenspor
- Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; Chair of Molecular Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany
| | | | - Michael J Kern
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Niklas Mejhert
- Department of Medicine, Karolinska Institutet, Center for Endocrinology and Metabolism, Karolinska University Hospital Huddinge, SE-141 86 Stockholm, Sweden
| | - Ingrid Dahlman
- Department of Medicine, Karolinska Institutet, Center for Endocrinology and Metabolism, Karolinska University Hospital Huddinge, SE-141 86 Stockholm, Sweden
| | - Ola Hansson
- Diabetes and Endocrinology Research Unit, Department of Clinical Sciences, Lund University, Malmö 20502, Sweden
| | - Stefanie M Hauck
- German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Research Unit Protein Science, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Matthias Blüher
- Department of Medicine, University of Leipzig, 04103 Leipzig, Germany
| | - Peter Arner
- Department of Medicine, Karolinska Institutet, Center for Endocrinology and Metabolism, Karolinska University Hospital Huddinge, SE-141 86 Stockholm, Sweden
| | - Leif Groop
- Diabetes and Endocrinology Research Unit, Department of Clinical Sciences, Lund University, Malmö 20502, Sweden
| | - Thomas Illig
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum München, 85764 Neuherberg, Germany; Hanover Unified Biobank, Hanover Medical School, 30625 Hanover, Germany
| | - Karsten Suhre
- Institute of Bioinformatics and Systems Biology, Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany; Department of Physiology and Biophysics, Weill Cornell Medical College in Qatar, Education City, Qatar Foundation, PO Box 24144, Doha, Qatar
| | - Yi-Hsiang Hsu
- Hebrew SeniorLife Institute for Aging Research, Harvard Medical School, Boston, MA 02131, USA; Molecular and Integrative Physiological Sciences, Harvard School of Public Health, Boston, MA 02115, USA
| | - Gunnar Mellgren
- Department of Clinical Science, University of Bergen, 5021 Bergen, Norway; K.G. Jebsen Center for Diabetes Research, Department of Clinical Science, University of Bergen, N-5021 Bergen, Norway; Hormone Laboratory, Haukeland University Hospital, 5021 Bergen, Norway
| | - Hans Hauner
- Chair of Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany; Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany and Technische Universität München, 85350 Freising-Weihenstephan, Germany; Else Kröner-Fresenius-Center for Nutritional Medicine, Klinikum rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Helmut Laumen
- Chair of Nutritional Medicine, Technische Universität München, Else Kröner-Fresenius-Center for Nutritional Medicine, 85350 Freising-Weihenstephan, Germany; Nutritional Medicine Unit, ZIEL-Research Center for Nutrition and Food Sciences, Technische Universität München, 85350 Freising-Weihenstephan, Germany; German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany; Clinical Cooperation Group Nutrigenomics and Type 2 Diabetes, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany and Technische Universität München, 85350 Freising-Weihenstephan, Germany; Institute of Experimental Genetics, Helmholtz Zentrum München, Neuherberg 85764, Germany.
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Xiao CW, Wood CM, Weber D, Aziz SA, Mehta R, Griffin P, Cockell KA. Dietary supplementation with soy isoflavones or replacement with soy proteins prevents hepatic lipid droplet accumulation and alters expression of genes involved in lipid metabolism in rats. Genes Nutr 2013; 9:373. [PMID: 24292949 DOI: 10.1007/s12263-013-0373-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 11/19/2013] [Indexed: 12/22/2022]
Abstract
Accumulation of hepatic lipid droplet (HLD) is the hallmark pathology of non-alcoholic fatty liver disease (NAFLD). This study examined the effects of soy isoflavones (ISF) and different amounts of soy proteins on the accumulation of HLD, lipid metabolism and related gene expression in rats. Weanling Sprague-Dawley rats were fed diets containing either 20 % casein protein without (D1) or with (D2) supplemental ISF (50 mg/kg diet) or substitution of casein with increasing amounts of alcohol-washed soy protein isolate (SPI, 5, 10, and 20 %; D3, D4, D5) for 90 days. Dietary casein (20 %) induced accumulation of HLD in female, but not in male rats. Both soy proteins and ISF remarkably prevented the formation of HLD. Soy proteins lowered hepatic total cholesterol and triglyceride in a dose-dependent manner. Interestingly, soy proteins but not ISF significantly increased free fatty acids in the liver of the female rats compared to D1. Proteomic analysis showed that at least 3 enzymes involved in lipogenesis were down-regulated and 7 proteins related to fatty acid β-oxidation or lipolysis were up-regulated by soy protein over D1. Additionally, 9 differentially expressed proteins identified were related to amino acid metabolism, 5 to glycolysis and 2 to cholesterol metabolism. Dietary ISF and SPI markedly reduced hepatic-peroxisome-proliferator-activated receptor γ2 (PPARγ2) and fat-specific protein 27 (FSP27) in female rats. Overall, this study has shown that partial or full replacement of dietary casein by soy protein or supplementation with soy ISF can effectively prevent the accumulation of HLD. The potential molecular mechanism(s) involved might be due to suppression of lipogenesis and stimulation of lipolysis and down-regulation of PPARγ2 and FSP27. This suggests that consumption of soy foods or supplements might be a useful strategy for the prevention or treatment of fatty liver diseases.
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Affiliation(s)
- Chao Wu Xiao
- Nutrition Research Division, Bureau of Nutritional Sciences, Health Products and Food Branch, Health Canada, Ottawa, ON, K1A 0K9, Canada,
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Xu X, Hu J, McGrath BC, Cavener DR. GCN2 in the brain programs PPARγ2 and triglyceride storage in the liver during perinatal development in response to maternal dietary fat. PLoS One 2013; 8:e75917. [PMID: 24130751 PMCID: PMC3794936 DOI: 10.1371/journal.pone.0075917] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Accepted: 08/18/2013] [Indexed: 12/19/2022] Open
Abstract
The liver plays a central role in regulating lipid metabolism and facilitates efficient lipid utilization and storage. We discovered that a modest increase in maternal dietary fat in mice programs triglyceride storage in the liver of their developing offspring. The activation of this programming is not apparent, however, until several months later at the adult stage. We found that the perinatal programming of adult hepatic triglyceride storage was controlled by the eIF2α kinase GCN2 (EIF2AK4) in the brain of the offspring, which stimulates epigenetic modification of the Pparγ2 gene in the neonatal liver. Genetic ablation of Gcn2 in the offspring exhibited reduced hepatic triglyceride storage and repressed expression of the peroxisome proliferator-activated receptor gamma 2 (Pparγ2) and two lipid droplet protein genes, Fsp27 and Cidea. Brain-specific, but not liver-specific, Gcn2 KO mice exhibit these same defects demonstrating that GCN2 in the developing brain programs hepatic triglyceride storage. GCN2 and nutrition-dependent programming of Pparγ2 is correlated with trimethylation of lysine 4 of histone 3 (H3K4me3) in the Pparγ2 promoter region during neonatal development. In addition to regulating hepatic triglyceride in response to modest changes in dietary fat, Gcn2 deficiency profoundly impacts the severity of the obese-diabetic phenotype of the leptin receptor mutant (db/db) mouse, by reducing hepatic steatosis and obesity but exacerbating the diabetic phenotype. We suggest that GCN2-dependent perinatal programming of hepatic triglyceride storage is an adaptation to couple early nutrition to anticipated needs for hepatic triglyceride storage in adults. However, increasing the hepatic triglyceride set point during perinatal development may predispose individuals to hepatosteatosis, while reducing circulating fatty acid levels that promote insulin resistance.
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Affiliation(s)
- Xu Xu
- Department of Biology, Center for Cellular Dynamics and the Huck Institute of the Life Sciences, Penn State University, University Park, Pennsylvania, United States of America
| | - Jingjie Hu
- Department of Biology, Center for Cellular Dynamics and the Huck Institute of the Life Sciences, Penn State University, University Park, Pennsylvania, United States of America
| | - Barbara C. McGrath
- Department of Biology, Center for Cellular Dynamics and the Huck Institute of the Life Sciences, Penn State University, University Park, Pennsylvania, United States of America
| | - Douglas R. Cavener
- Department of Biology, Center for Cellular Dynamics and the Huck Institute of the Life Sciences, Penn State University, University Park, Pennsylvania, United States of America
- * E-mail:
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Camargo A, Meneses ME, Rangel-Zuñiga OA, Perez-Martinez P, Marin C, Delgado-Lista J, Paniagua JA, Tinahones FJ, Roche H, Malagon MM, Perez-Jimenez F, Lopez-Miranda J. Endoplasmic reticulum stress in adipose tissue determines postprandial lipoprotein metabolism in metabolic syndrome patients. Mol Nutr Food Res 2013; 57:2166-76. [PMID: 23934773 DOI: 10.1002/mnfr.201300036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 04/27/2013] [Accepted: 06/04/2013] [Indexed: 12/18/2022]
Abstract
SCOPE Our aim was to ascertain whether the quality and quantity of fat in the diet may influence the ER stress at the postprandial state in adipose tissue by analyzing the gene expression of chaperones, folding enzymes, and activators of the UPR. METHODS AND RESULTS A randomized, controlled trial conducted within the LIPGENE study assigned 39 MetS patients to one of four diets: high-SFA (HSFA; 38% energy (E) from fat, 16% E as SFA), high MUFA (HMUFA; 38% E from fat, 20% E as MUFA), and two low-fat, high-complex carbohydrate (LFHCC; 28% E from fat) diets supplemented with 1.24 g/day of long-chain n-3 PUFA or placebo for 12 wk each. A fat challenge reflecting the same fatty acid composition as the original diets was conducted post intervention. sXBP-1 is induced in the postprandial state irrespective of the diet consumed (p < 0.001). BiP increases postprandially after consumption of diets HMUFA (p = 0.006), LFHCC (p = 0.028), and LFHCC n-3 (p = 0.028). Postprandial mRNA expression levels of CRL, CNX, PDIA3, and GSTP1 in AT did not differ between the different types of diets. CONCLUSION Our results suggest that upregulation of the unfolded protein response at the postprandial state may represent an adaptive mechanism to counteract diet-induced stress.
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Affiliation(s)
- Antonio Camargo
- Lipids and Atherosclerosis Unit, IMIBIC/Reina Sofia University Hospital/University of Cordoba, Cordoba, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Spain
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50
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Camacho A, Huang JK, Delint-Ramirez I, Yew Tan C, Fuller M, Lelliott CJ, Vidal-Puig A, Franklin RJM. Peroxisome proliferator-activated receptor gamma-coactivator-1 alpha coordinates sphingolipid metabolism, lipid raft composition and myelin protein synthesis. Eur J Neurosci 2013; 38:2672-83. [DOI: 10.1111/ejn.12281] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Revised: 05/14/2013] [Accepted: 05/16/2013] [Indexed: 01/19/2023]
Affiliation(s)
- Alberto Camacho
- Metabolic Research Laboratories; Institute of Metabolic Science; Addenbrooke's Treatment Centre; Addenbrooke's Hospital; University of Cambridge; Cambridge; UK
| | - Jeffrey K. Huang
- Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute and Department of Veterinary Medicine; Cambridge; UK
| | - Ilse Delint-Ramirez
- Department of Pharmacology; Faculty of Medicine; Autonomous University of Nuevo León; Monterrey; Mexico
| | - Chong Yew Tan
- Metabolic Research Laboratories; Institute of Metabolic Science; Addenbrooke's Treatment Centre; Addenbrooke's Hospital; University of Cambridge; Cambridge; UK
| | - Maria Fuller
- Department of Genetics and Molecular Pathology; SA Pathology; Adelaide; SA; Australia
| | | | - Antonio Vidal-Puig
- Metabolic Research Laboratories; Institute of Metabolic Science; Addenbrooke's Treatment Centre; Addenbrooke's Hospital; University of Cambridge; Cambridge; UK
| | - Robin J. M. Franklin
- Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute and Department of Veterinary Medicine; Cambridge; UK
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