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Abulizi A, Camporez JP, Zhang D, Samuel VT, Shulman GI, Vatner DF. Ectopic lipid deposition mediates insulin resistance in adipose specific 11β-hydroxysteroid dehydrogenase type 1 transgenic mice. Metabolism 2019; 93:1-9. [PMID: 30576689 PMCID: PMC6401251 DOI: 10.1016/j.metabol.2018.12.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 11/28/2018] [Accepted: 12/14/2018] [Indexed: 12/17/2022]
Abstract
CONTEXT Excessive adipose glucocorticoid action is associated with insulin resistance, but the mechanisms linking adipose glucocorticoid action to insulin resistance are still debated. We hypothesized that insulin resistance from excess glucocorticoid action may be attributed in part to increased ectopic lipid deposition in liver. METHODS We tested this hypothesis in the adipose specific 11β-hydroxysteroid dehydrogenase-1 (HSD11B1) transgenic mouse, an established model of adipose glucocorticoid excess. Tissue specific insulin action was assessed by hyperinsulinemic-euglycemic clamps, hepatic lipid content was measured, hepatic insulin signaling was assessed by immunoblotting. The role of hepatic lipid content was further probed by administration of the functionally liver-targeted mitochondrial uncoupler, Controlled Release Mitochondrial Protonophore (CRMP). FINDINGS High fat diet fed HSD11B1 transgenic mice developed more severe hepatic insulin resistance than littermate controls (endogenous suppression of hepatic glucose production was reduced by 3.8-fold, P < 0.05); this was reflected by decreased insulin-stimulated hepatic insulin receptor kinase tyrosine phosphorylation and AKT serine phosphorylation. Hepatic insulin resistance was associated with a 53% increase (P < 0.05) in hepatic triglyceride content, a 73% increase in diacylglycerol content (P < 0.01), and a 66% increase in PKCε translocation (P < 0.05). Hepatic insulin resistance was prevented with administration of CRMP by reversal of hepatic steatosis and prevention of hepatic diacylglycerol accumulation and PKCε activation. CONCLUSIONS These findings are consistent with excess adipose glucocorticoid activity being a predisposing factor for the development of lipid (diacylglycerol-PKCε)-induced hepatic insulin resistance.
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Affiliation(s)
- Abudukadier Abulizi
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA.
| | - João-Paulo Camporez
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Dongyan Zhang
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA.
| | - Varman T Samuel
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA; Veterans Affairs Medical Center, West Haven, CT 06516, USA.
| | - Gerald I Shulman
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA; Department of Cellular & Molecular Physiology, Yale University School of Medicine, New Haven, CT 06520, USA.
| | - Daniel F Vatner
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA.
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Dinh Cat AN, Friederich-Persson M, White A, Touyz RM. Adipocytes, aldosterone and obesity-related hypertension. J Mol Endocrinol 2016; 57:F7-F21. [PMID: 27357931 DOI: 10.1530/jme-16-0025] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Accepted: 05/09/2016] [Indexed: 12/15/2022]
Abstract
Understanding the mechanisms linking obesity with hypertension is important in the current obesity epidemic as it may improve therapeutic interventions. Plasma aldosterone levels are positively correlated with body mass index and weight loss in obese patients is reported to be accompanied by decreased aldosterone levels. This suggests a relationship between adipose tissue and the production/secretion of aldosterone. Aldosterone is synthesized principally by the adrenal glands, but its production may be regulated by many factors, including factors secreted by adipocytes. In addition, studies have reported local synthesis of aldosterone in extra-adrenal tissues, including adipose tissue. Experimental studies have highlighted a role for adipocyte-secreted aldosterone in the pathogenesis of obesity-related cardiovascular complications via the mineralocorticoid receptor. This review focuses on how aldosterone secretion may be influenced by adipose tissue and the importance of these mechanisms in the context of obesity-related hypertension.
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Affiliation(s)
- Aurelie Nguyen Dinh Cat
- Institute of Cardiovascular and Medical SciencesBHF Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, UK
| | - Malou Friederich-Persson
- Institute of Cardiovascular and Medical SciencesBHF Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, UK
| | - Anna White
- Institute of Cardiovascular and Medical SciencesBHF Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, UK
| | - Rhian M Touyz
- Institute of Cardiovascular and Medical SciencesBHF Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, UK
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3
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Lemche E, Chaban OS, Lemche AV. Neuroendocrinological and Epigenetic Mechanisms Subserving Autonomic Imbalance and HPA Dysfunction in the Metabolic Syndrome. Front Neurosci 2016; 10:142. [PMID: 27147943 PMCID: PMC4830841 DOI: 10.3389/fnins.2016.00142] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 03/21/2016] [Indexed: 12/18/2022] Open
Abstract
Impact of environmental stress upon pathophysiology of the metabolic syndrome (MetS) has been substantiated by epidemiological, psychophysiological, and endocrinological studies. This review discusses recent advances in the understanding of causative roles of nutritional factors, sympathomedullo-adrenal (SMA) and hypothalamic-pituitary adrenocortical (HPA) axes, and adipose tissue chronic low-grade inflammation processes in MetS. Disturbances in the neuroendocrine systems for leptin, melanocortin, and neuropeptide Y (NPY)/agouti-related protein systems have been found resulting directly in MetS-like conditions. The review identifies candidate risk genes from factors shown critical for the functioning of each of these neuroendocrine signaling cascades. In its meta-analytic part, recent studies in epigenetic modification (histone methylation, acetylation, phosphorylation, ubiquitination) and posttranscriptional gene regulation by microRNAs are evaluated. Several studies suggest modification mechanisms of early life stress (ELS) and diet-induced obesity (DIO) programming in the hypothalamic regions with populations of POMC-expressing neurons. Epigenetic modifications were found in cortisol (here HSD11B1 expression), melanocortin, leptin, NPY, and adiponectin genes. With respect to adiposity genes, epigenetic modifications were documented for fat mass gene cluster APOA1/C3/A4/A5, and the lipolysis gene LIPE. With regard to inflammatory, immune and subcellular metabolism, PPARG, NKBF1, TNFA, TCF7C2, and those genes expressing cytochrome P450 family enzymes involved in steroidogenesis and in hepatic lipoproteins were documented for epigenetic modifications.
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Affiliation(s)
- Erwin Lemche
- Section of Cognitive Neuropsychiatry, Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London London, UK
| | - Oleg S Chaban
- Section of Psychosomatic Medicine, Bogomolets National Medical University Kiev, Ukraine
| | - Alexandra V Lemche
- Department of Medical Science, Institute of Clinical Research Berlin, Germany
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Pharmacokinetics of total and unbound prednisone and prednisolone in stable kidney transplant recipients with diabetes mellitus. Ther Drug Monit 2015; 36:448-55. [PMID: 24452065 DOI: 10.1097/ftd.0000000000000045] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
BACKGROUND The corticosteroid prednisone is an important component of posttransplantation immunosuppressive therapy. Pharmacokinetic parameters of prednisone or its pharmacologically active metabolite, prednisolone, are not well characterized in transplant recipients. The objective of this study was to compare the pharmacokinetics of total and unbound prednisone and prednisolone in diabetic and nondiabetic stable kidney transplant recipients and to evaluate the factors influencing plasma protein binding of prednisolone. METHODS Prednisone and prednisolone concentration-time profiles were obtained in 20 diabetic and 18 nondiabetic stable kidney transplant recipients receiving an oral dose of 5-10 mg prednisone per day. In addition to drug and metabolite exposures, factors influencing prednisolone protein binding were evaluated using a nonlinear mixed-effects modeling approach. This model takes into account the binding of prednisolone and cortisol to corticosteroid-binding globulin (CBG) in a saturable fashion and binding of prednisolone to albumin in a nonsaturable fashion. Finally, we have investigated the influence of several covariates including diabetes, glucose concentration, hemoglobin A1c, creatinine clearance, body mass index, gender, age, and time after transplantation on the affinity constant (K) between corticosteroids and their binding proteins. RESULTS In patients with diabetes, the values of dose-normalized area under the concentration-time curves were 27% and 23% higher for total and unbound prednisolone, respectively. Moreover, the ratio of total prednisolone to prednisone concentrations (active/inactive forms) was higher in diabetic subjects (P < 0.001). Modeling protein binding results revealed that the affinity constant of corticosteroid-binding globulin-prednisolone (KCBG,PL) was related to the patient's gender and diabetes status. CONCLUSIONS Higher prednisolone exposure could potentially lead to the increased risk of corticosteroid-related complications in diabetic kidney transplant recipients.
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Pereira MJ, Palming J, Svensson MK, Rizell M, Dalenbäck J, Hammar M, Fall T, Sidibeh CO, Svensson PA, Eriksson JW. FKBP5 expression in human adipose tissue increases following dexamethasone exposure and is associated with insulin resistance. Metabolism 2014; 63:1198-208. [PMID: 24997500 DOI: 10.1016/j.metabol.2014.05.015] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 05/01/2014] [Accepted: 05/29/2014] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To study effects of dexamethasone on gene expression in human adipose tissue aiming to identify potential novel mechanisms for glucocorticoid-induced insulin resistance. MATERIALS/METHODS Subcutaneous and omental adipose tissue, obtained from non-diabetic donors (10 M/15 F; age: 28-60 years; BMI: 20.7-30.6 kg/m²), was incubated with or without dexamethasone (0.003-3 μmol/L) for 24 h. Gene expression was assessed by microarray and real time-PCR and protein expression by immunoblotting. RESULTS FKBP5 (FK506-binding protein 5) and CNR1 (cannabinoid receptor 1) were the most responsive genes to dexamethasone in both subcutaneous and omental adipose tissue (~7-fold). Dexamethasone increased FKBP5 gene and protein expression in a dose-dependent manner in both depots. The gene product, FKBP51 protein, was 10-fold higher in the omental than in the subcutaneous depot, whereas the mRNA levels were similar. Higher FKBP5 gene expression in omental adipose tissue was associated with reduced insulin effects on glucose uptake in both depots. Furthermore, FKBP5 gene expression in subcutaneous adipose tissue was positively correlated with serum insulin, HOMA-IR and subcutaneous adipocyte diameter and negatively with plasma HDL-cholesterol. FKBP5 SNPs were found to be associated with type 2 diabetes and diabetes-related phenotypes in large population-based samples. CONCLUSIONS Dexamethasone exposure promotes expression of FKBP5 in adipose tissue, a gene that may be implicated in glucocorticoid-induced insulin resistance.
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MESH Headings
- Adult
- Biological Transport/drug effects
- Cells, Cultured
- Dexamethasone/pharmacology
- Endothelium, Vascular/cytology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Gene Expression Regulation/drug effects
- Glucocorticoids/pharmacology
- Glucose/metabolism
- Humans
- Insulin/blood
- Insulin/pharmacology
- Insulin Resistance
- Intra-Abdominal Fat/blood supply
- Intra-Abdominal Fat/cytology
- Intra-Abdominal Fat/drug effects
- Intra-Abdominal Fat/metabolism
- Male
- Middle Aged
- Osmolar Concentration
- RNA, Messenger/metabolism
- Receptor, Cannabinoid, CB1/agonists
- Receptor, Cannabinoid, CB1/genetics
- Receptor, Cannabinoid, CB1/metabolism
- Stromal Cells/cytology
- Stromal Cells/drug effects
- Stromal Cells/metabolism
- Subcutaneous Fat, Abdominal/blood supply
- Subcutaneous Fat, Abdominal/cytology
- Subcutaneous Fat, Abdominal/drug effects
- Subcutaneous Fat, Abdominal/metabolism
- Tacrolimus Binding Proteins/chemistry
- Tacrolimus Binding Proteins/genetics
- Tacrolimus Binding Proteins/metabolism
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Affiliation(s)
- Maria J Pereira
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden; Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Jenny Palming
- Department of Molecular and Clinical Medicine and Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Maria K Svensson
- Department of Molecular and Clinical Medicine and Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Magnus Rizell
- Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Jan Dalenbäck
- Department of Surgery, Frölunda Specialist Hospital, Gothenburg, Sweden
| | | | - Tove Fall
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Cherno O Sidibeh
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Per-Arne Svensson
- Department of Molecular and Clinical Medicine and Center for Cardiovascular and Metabolic Research, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Jan W Eriksson
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden; AstraZeneca R&D, Mölndal, Sweden.
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6
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Zinkhan EK, Lang BY, Yu B, Wang Y, Jiang C, Fitzhugh M, Dahl M, Campbell MS, Fung C, Malleske D, Albertine KH, Joss-Moore L, Lane RH. Maternal tobacco smoke increased visceral adiposity and serum corticosterone levels in adult male rat offspring. Pediatr Res 2014; 76:17-23. [PMID: 24727947 DOI: 10.1038/pr.2014.58] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 01/24/2014] [Indexed: 12/20/2022]
Abstract
BACKGROUND Maternal tobacco smoke (MTS) predisposes human and rat offspring to visceral obesity in early adulthood. Glucocorticoid excess also causes visceral obesity. We hypothesized that in utero MTS would increase visceral adiposity and alter the glucocorticoid pathway in young adult rats. METHODS We developed a novel model of in utero MTS exposure in pregnant rats by exposing them to cigarette smoke from E11.5 to term. Neonatal rats were cross-fostered to control dams and weaned to standard rat chow through young adulthood (postnatal day 60). RESULTS We demonstrated increased visceral adiposity (193%)*, increased visceral adipose 11-β hydroxysteroid dehydrogenase 1 mRNA (204%)*, increased serum corticosterone (147%)*, and no change in glucocorticoid receptor protein in adult male MTS rat offspring. Female rats exposed to MTS in utero demonstrated no change in visceral or subcutaneous adiposity, decreased serum corticosterone (60%)*, and decreased adipose glucocorticoid receptor protein (66%)*. *P < 0.05. CONCLUSION We conclude that in utero MTS exposure increased visceral adiposity and altered in the glucocorticoid pathway in a sex-specific manner. We speculate that in utero MTS exposure programs adipose dysfunction in adult male rat offspring via alteration in the glucocorticoid pathway.
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Affiliation(s)
- Erin K Zinkhan
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Brook Y Lang
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Baifeng Yu
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Yan Wang
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Chengshe Jiang
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Melanie Fitzhugh
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Marjanna Dahl
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Michael S Campbell
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Camille Fung
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Daniel Malleske
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Kurt H Albertine
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Lisa Joss-Moore
- Division of Neonatology, Department of Pediatrics, University of Utah, Salt Lake City, Utah
| | - Robert H Lane
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin
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7
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Methlie P, Dankel S, Myhra T, Christensen B, Gjerde J, Fadnes D, Våge V, Løvås K, Mellgren G. Changes in adipose glucocorticoid metabolism before and after bariatric surgery assessed by direct hormone measurements. Obesity (Silver Spring) 2013; 21:2495-503. [PMID: 23512832 DOI: 10.1002/oby.20449] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Accepted: 02/21/2013] [Indexed: 12/29/2022]
Abstract
OBJECTIVES Increased intra-adipose cortisol is thought to promote obesity, but few human studies have investigated intra-adipose glucocorticoid hormones and none have demonstrated prospective changes with fat loss. DESIGN AND METHODS Subcutaneous adipose tissue (SAT) was obtained from obese subjects before and 1-year after surgery-induced fat loss, and from nonobese controls. In a second similar cohort of obese subjects, adipocytes and stromal-vascular fraction were isolated. Intra-adipose cortisol and cortisone levels were analyzed by liquid chromatography mass spectrometry and HSD11B1/HSD11B2 mRNA by qPCR. RESULTS SAT cortisol/cortisone ratio before fat loss, median 4.8 (interquartile range, 4.1-5.7), was higher than after fat loss, 1.9 (1.0-2.7) (P = 0.001), and compared to nonobese controls, 3.2 (2.4-3.9) (P = 0.005). Cortisone before fat loss, 2.3 (1.2-2.9) nmol/kg, was lower than after fat loss, 5.8 (3.0-10.2) nmol/kg (P = 0.042), and compared to controls, 5.1 (3.8-6.7) nmol/kg (P = 0.013). HSD11B1 was predominantly expressed in mature adipocytes, whereas HSD11B2 was expressed at a higher level in stromal-vascular fraction. CONCLUSIONS The intra-adipose glucocorticoid metabolism was markedly altered in the extremely obese state with increased cortisol levels relative to cortisone, whereas fat loss restored this balance approximating nonobese subjects. Changes were more pronounced for cortisone than cortisol, suggesting an adaptive response to insufficient intra-adipose cortisol levels in obesity.
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Affiliation(s)
- Paal Methlie
- Department of Clinical Science, University of Bergen, Bergen, Norway; Hormone Laboratory, Haukeland University Hospital, Bergen, Norway
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8
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Liver upregulation of genes involved in cortisol production and action is associated with metabolic syndrome in morbidly obese patients. Obes Surg 2012; 22:478-86. [PMID: 21964795 DOI: 10.1007/s11695-011-0524-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND Hepatic 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) activity, which converts cortisone (inactive) to cortisol, is downregulated in obesity. However, this compensation fails in obese with metabolic abnormalities, such as diabetes. To further characterize the tissue-specific cortisol regeneration in obesity, we have investigated the mRNA expression of genes related to local cortisol production, i.e., 11β-HSD1, hexose-6-phosphate dehydrogenase (H6PDH) and cortisol action, glucocorticoid receptor (GR) and a cortisol target gene, phosphoenolpyruvate carboxykinase (PEPCK) in the liver, and visceral (VAT) and subcutaneous (SAT) adipose tissues from morbidly obese patients with and without metabolic syndrome (MS). METHODS Fifty morbidly obese patients undergoing bariatric surgery, 14 men (mean age, 41.3 ± 3.5 years; BMI, 48.0 ± 3.6 kg/m(2)) and 36 women (mean age, 44.6 ± 1.9 years; BMI, 44.9 ± 1.2 kg/m(2)), were classified as having MS (MS+, n = 20) or not (MS-, n = 30). Tissue mRNA levels were measured by real-time polymerase chain reaction. RESULTS Hepatic mRNA levels of these genes were higher in obese patients with MS (11β-HSD1, P = 0.002; H6PDH, P = 0.043; GR, P = 0.033; PEPCK, P = 0.032) and positively correlated with the number of clinical characteristics that define the MS. The expression of the four genes positively correlated among them. In contrast to the liver, these genes were not differently expressed in VAT or SAT, when MS+ and MS- obese patients were compared. CONCLUSIONS Coordinated liver-specific upregulation of genes involved in local cortisol regeneration and action support the concept that local hepatic hypercortisolism contributes to development of MS in morbidly obese patients.
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Duran-Gonzalez J, Ortiz I, Gonzales E, Ruiz N, Ortiz M, Gonzalez A, Sanchez EK, Curet E, Fisher-Hoch S, Rentfro A, Qu H, Nair S. Association study of candidate gene polymorphisms and obesity in a young Mexican-American population from South Texas. Arch Med Res 2011; 42:523-31. [PMID: 22056417 DOI: 10.1016/j.arcmed.2011.10.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Accepted: 07/21/2011] [Indexed: 01/09/2023]
Abstract
BACKGROUND AND AIMS Obesity is increasingly a health problem and a risk factor for diabetes in young Mexican-American populations. Genetic association studies in older, mostly non-Hispanic populations have reported that polymorphisms in the candidate genes HSD11B1, CRP, ADIPOQ, PPARG, ANKK1, ABCC8 and SERPINF1 are associated with obesity or diabetes. We analyzed the polymorphisms rs846910, rs1205, rs1501299, rs1801282, rs1800497, rs757110 and rs1136287 in these candidate genes, for association with obesity and metabolic traits in a young Mexican-American population from south Texas. METHODS Genotyping of the seven common SNPs were performed by allelic discrimination assays in 448 unrelated Mexican Americans (median age = 16 years) from south Texas. χ(2) tests and regression analyses using additive models were used for genetic association analyses adjusting for covariates; p values were corrected for multiple testing by permutation analyses. RESULTS rs1800497 (ANKK1) shows association with waist circumference (p = 0.009) and retains the association (p = 0.03) after permutation testing. Analysis of metabolic quantitative traits shows that rs846910 (HSD11B1) was associated with HOMA-IR (p = 0.04) and triglycerides (p = 0.03), and rs1205 (CRP) with HOMA-IR (p = 0.03) and fasting glucose levels (p = 0.007). However, the quantitative traits associations are not maintained after permutation analysis. None of the other SNPs in this study showed associations with obesity or metabolic traits in this young Mexican-American population. CONCLUSIONS We report a potential association between rs1800497 (linked to changes in brain dopamine receptor levels) and central obesity in a young Mexican-American population.
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Affiliation(s)
- Jorge Duran-Gonzalez
- Department of Biological Sciences and Center of Biomedical Studies, University of Texas School of Public Health, Brownsville, TX 78520, USA
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10
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Fernández Vázquez G, Torrecilla García E, Rubio Herrera MÁ. El síndrome metabólico como síndrome de Cushing intrahepatocitario. ACTA ACUST UNITED AC 2011; 58:153-6. [DOI: 10.1016/j.endonu.2010.12.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Revised: 12/01/2010] [Accepted: 12/09/2010] [Indexed: 02/08/2023]
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11
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Lopez-Alvarenga JC, Ebbesson SOE, Ebbesson LOE, Tejero ME, Voruganti VS, Comuzzie AG. Polyunsaturated fatty acids effect on serum triglycerides concentration in the presence of metabolic syndrome components. The Alaska-Siberia Project. Metabolism 2010; 59:86-92. [PMID: 19766268 PMCID: PMC2808028 DOI: 10.1016/j.metabol.2009.07.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Revised: 06/18/2009] [Accepted: 07/09/2009] [Indexed: 12/25/2022]
Abstract
Serum fatty acids (FAs) have wide effects on metabolism: Serum saturated fatty acids (SFAs) increase triglyceride (TG) levels in plasma, whereas polyunsaturated fatty acids (PUFAs) reduce them. Traditionally, Eskimos have a high consumption of omega-3 fatty acids (omega3 FAs); but the Westernization of their food habits has increased their dietary SFAs, partly reflected in their serum concentrations. We studied the joint effect of serum SFAs and PUFAs on circulating levels of TGs in the presence of metabolic syndrome components. We included 212 men and 240 women (age, 47.9 +/- 15.7 years; body mass index [BMI], 26.9 +/- 5.3) from 4 villages located in Alaska for a cross-sectional study. Generalized linear models were used to build surface responses of TG as functions of SFAs and PUFAs measured in blood samples adjusting by sex, BMI, and village. The effects of individual FAs were assessed by multiple linear regression analysis, and partial correlations (r) were calculated. The most important predictors for TG levels were glucose tolerance (r = 0.116, P = .018) and BMI (r = 0.42, P < .001). Triglyceride concentration showed negative associations with 20:3omega6 (r = -0.16, P = .001), 20:4omega6 (r = -0.14, P = .005), 20:5omega3 (r = -0.17, P < .001), and 22:5omega3 (r = -0.26, P < .001), and positive associations with palmitic acid (r = 0.16, P < .001) and 18:3omega3 (r = 0.15, P < .001). The surface response analysis suggested that the effect of palmitic acid on TG is blunted in different degrees according to the PUFA chemical structure. The long-chain omega3, even in the presence of high levels of saturated fat, was associated with lower TG levels. Eicosapentaenoic acid (20:5omega3) had the strongest effect against palmitic acid on TG. The total FA showed moderate association with levels of TG, whereas SFA was positively associated and large-chain PUFA was negatively associated. The Westernized dietary habits among Eskimos are likely to change their metabolic profile and increase comorbidities related to metabolic disease.
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Affiliation(s)
- Juan C Lopez-Alvarenga
- Department of Genetics, Southwest Foundation for Biomedical Research, San Antonio, TX 78227-5301, USA
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12
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Abstract
The molecular basis for biological rhythms is formed by clock genes. Clock genes are functional in the liver, within gastrointestinal epithelial cells and neurons of the enteric nervous system. These observations suggest a possible role for clock genes in various circadian functions of the liver and the gastrointestinal tract through the modulation of organ specific clock-controlled genes. Consequently, disruptions in circadian rhythmicity may lead to adverse health consequences. This review will focus on the current understanding of the role of circadian rhythms in the pathogenesis of gastrointestinal- and hepatic disease such as obesity, non-alcoholic fatty liver disease, alcoholic fatty liver disease and alterations in colonic motility.
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Affiliation(s)
- Willemijntje A Hoogerwerf
- Department of Internal Medicine, Division of Gastroenterology, VA Ann Arbor Healthcare System, University of Michigan, 2215 Fuller Road, Ann Arbor, MI 48105, USA.
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13
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Maris M, Overbergh L, Mathieu C. Type 2 diabetes: Gaining insight into the disease process using proteomics. Proteomics Clin Appl 2008; 2:312-26. [PMID: 21136836 DOI: 10.1002/prca.200780093] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2007] [Indexed: 12/30/2022]
Abstract
The incidence of diabetes mellitus is growing rapidly, with an increasing disease related morbidity and mortality. This is caused by macro- and microvascular complications, as a consequence of the often late diagnosis of type 2 diabetes (T2D), but especially by the difficulties to control glucose homeostasis due to the progressive nature of the disease. T2D is moreover a dual disease, with components of beta-cell failure and components of insulin resistance in peripheral organs, such as liver, fat, and muscle. Understanding the pathogenesis of the disease by gaining insight into the molecular pathways involved in both phenomena is one of the major assets of proteomic approaches. Moreover, proteomics and peptidomics may provide us with robust biomarkers for beta-cell failure, insulin resistance in pheripheral organs, but also for the development of diabetic complications. This review focuses on the knowledge gained by use of proteomic and peptidomic techniques in the study of the pathophysiology of T2D and in the attempts to discover new therapeutic targets.
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Affiliation(s)
- Michael Maris
- Laboratory for Experimental Medicine and Endocrinology (LEGENDO), Catholic University of Leuven, Leuven, Belgium
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Bibliography. Current world literature. Growth and development. Curr Opin Endocrinol Diabetes Obes 2008; 15:79-101. [PMID: 18185067 DOI: 10.1097/med.0b013e3282f4f084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Vantyghem MC, Marcelli-Tourvieille S, Defrance F, Wemeau JL. 11β-hydroxystéroïde déshydrogénases. Avancées récentes. ANNALES D'ENDOCRINOLOGIE 2007; 68:349-56. [PMID: 17368420 DOI: 10.1016/j.ando.2007.02.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
11beta-hydroxysteroide dehydrogenase (11beta-OHSD) enzymes exhibit a regulating action upon cortisol metabolism before access to its receptors. Two types of isoenzymes have been described, type 2 being the most anciently known. Type 2 11beta-OHSD, which changes cortisol into cortisone, is a unidirectional dehydrogenase mainly located in kidney, that protects mineralocorticoid receptors from illicit activation by glucocorticoids. Mutations of the gene coding for this enzyme has been demonstrated in apparent mineralocorticoid excess, which induces hypertension and hypokalemia with low renin and aldosterone levels. Polymorphisms of this gene could modulate essential hypertension and also be responsible for certain forms of acquired apparent mineralocorticoid excess especially after liquorice intoxication, in hypothyroidism, Cushing syndrome, and chronic renal insufficiency. Type 1 11beta-OHSD, which changes cortisone into cortisol, is a reductase, mainly located in liver and adipose tissue. Functional defects of this enzyme have been shown in polycystic ovaries and cortisone reductase deficiency. By contrast, metabolic syndrome, corticoid-induced osteoporosis, and glaucoma are linked to a local over-activity of this enzyme. The understanding of action mechanisms of these two enzymes currently leads to 11beta-OHSD inhibitors development, therefore opening new therapeutic strategies, especially in metabolic syndrome.
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Affiliation(s)
- M-C Vantyghem
- Service d'endocrinologie et métabolisme, clinique d'endocrinologie Marc-Linquette, 6, rue du Professeur-Laguesse, CHRU de Lille, 59037 Lille cedex, France.
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Affiliation(s)
- Rebecca M Reynolds
- University of Edinburgh, Endocrinology Unit, Centre for Cardiovascular Science, Queen's Medical Research Institute, Edinburgh, UK
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