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Yavuz E, Irak K, Çelik ÖY, Bolacali M, Ergiden Y, Gürgöze S. Determination of the Relationship of Serum Amino Acid Profile with Sex and Body Weight in Healthy Geese by Liquid Chromatography-Tandem Mass Spectrometry. BRAZILIAN JOURNAL OF POULTRY SCIENCE 2022. [DOI: 10.1590/1806-9061-2021-1569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- E Yavuz
- International Center for Livestock Research and Training, Turkey
| | | | | | | | - Y Ergiden
- International Center for Livestock Research and Training, Turkey
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Raut S, Kumar AV, Deshpande S, Khambata K, Balasinor NH. Sex hormones regulate lipid metabolism in adult Sertoli cells: A genome-wide study of estrogen and androgen receptor binding sites. J Steroid Biochem Mol Biol 2021; 211:105898. [PMID: 33845154 DOI: 10.1016/j.jsbmb.2021.105898] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 03/16/2021] [Accepted: 04/07/2021] [Indexed: 12/21/2022]
Abstract
Optimal functioning of Sertoli cells is crucial for spermatogenesis which is under tight regulation of sex hormones, estrogen and androgen. Adult rat Sertoli cells expresses estrogen receptor beta (ERβ) and androgen receptor (AR), both of which regulate gene transcription by binding to the DNA. The present study is aimed to acquire a genome-wide map of estrogen- and androgen-regulated genes in adult Sertoli cells. ChIP-Seq was performed for ERβ and AR in Sertoli cells under physiological conditions. 30,859 peaks in ERβ and 9,594 peaks in AR were identified with a fold enrichment >2 fold. Pathway analysis for the genes revealed metabolic pathways to be significantly enriched. Since Sertoli cells have supportive functions and provide energy substrates to germ cells during spermatogenesis, significantly enriched metabolic pathways were explored further. Peaks of the genes involved in lipid metabolism, like fatty acid, glyceride, leucine, and sphingosine metabolism were validated. Motif analysis confirmed the presence of estrogen- and androgen-response elements (EREs and AREs). Moreover, transcript levels of enzymes involved in the lipid metabolic pathways were significantly altered in cultured Sertoli cells treated with estrogen and androgen receptor agonists, demonstrating functional significance of these binding sites. This study elucidates a mechanism by which sex hormones regulate lipid metabolism in Sertoli cells by transcriptionally controlling the expression of these genes, thereby shedding light on the roles of these hormones in male fertility.
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Affiliation(s)
- Sanketa Raut
- Department of Neuroendocrinology, ICMR-National Institute for Research in Reproductive Health, Mumbai, India
| | - Anita V Kumar
- Department of Neuroendocrinology, ICMR-National Institute for Research in Reproductive Health, Mumbai, India
| | - Sharvari Deshpande
- Department of Neuroendocrinology, ICMR-National Institute for Research in Reproductive Health, Mumbai, India
| | - Kushaan Khambata
- Department of Neuroendocrinology, ICMR-National Institute for Research in Reproductive Health, Mumbai, India
| | - Nafisa H Balasinor
- Department of Neuroendocrinology, ICMR-National Institute for Research in Reproductive Health, Mumbai, India.
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Carlton M, Voisey J, Parker TJ, Punyadeera C, Cuttle L. A review of potential biomarkers for assessing physical and psychological trauma in paediatric burns. BURNS & TRAUMA 2021; 9:tkaa049. [PMID: 33654699 PMCID: PMC7901707 DOI: 10.1093/burnst/tkaa049] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 09/09/2020] [Accepted: 01/03/2021] [Indexed: 01/08/2023]
Abstract
Biological markers that evaluate physical healing as well as psychological impact of a burn are essential for effective treatment of paediatric burns. The objective of this review is to summarize the evidence supporting the use of biomarkers in children with burns. An extensive review of the literature was performed using PubMed. A total of 59 biomarkers were identified relating to burn presence, specifically relating to processes involved in inflammation, wound healing, growth and metabolism. In addition, biomarkers involved in the stress response cascade following a burn trauma were also identified. Although many biomarkers have been identified that are potentially associated with burn-related physical and psychological trauma, an understanding of burn biology is still lacking in children. We propose that future research in the field of children’s burns should be conducted using broad screening methods for identifying potential biomarkers, examine the biological interactions of different biomarkers, utilize child-appropriate biological fluids such as urine or saliva, and include a range of different severity burns. Through further research, the biological response to burn injury may be fully realized and clinically relevant diagnostic tests and treatment therapies utilizing these biomarkers could be developed, for the improvement of healing outcomes in paediatric burn patients.
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Affiliation(s)
- Morgan Carlton
- Queensland University of Technology (QUT), Centre for Children's Burn and Trauma Research, Centre for Children's Health Research, South Brisbane, Queensland, Australia
| | - Joanne Voisey
- Queensland University of Technology (QUT), Faculty of Health, School of Biomedical Sciences, Brisbane, Queensland, Australia
| | - Tony J Parker
- Queensland University of Technology (QUT), Faculty of Health, School of Biomedical Sciences, Brisbane, Queensland, Australia
| | - Chamindie Punyadeera
- Queensland University of Technology (QUT), Faculty of Health, School of Biomedical Sciences, Saliva and Liquid Biopsy Translational Laboratory, Brisbane, Queensland, Australia
| | - Leila Cuttle
- Queensland University of Technology (QUT), Centre for Children's Burn and Trauma Research, Centre for Children's Health Research, South Brisbane, Queensland, Australia
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Mandrup CM, Roland CB, Egelund J, Nyberg M, Enevoldsen LH, Kjaer A, Clemmensen A, Christensen AN, Suetta C, Frikke-Schmidt R, Utoft BB, Kristensen JM, Wojtaszewski JFP, Hellsten Y, Stallknecht B. Effects of High-Intensity Exercise Training on Adipose Tissue Mass, Glucose Uptake and Protein Content in Pre- and Post-menopausal Women. Front Sports Act Living 2020; 2:60. [PMID: 33345051 PMCID: PMC7739715 DOI: 10.3389/fspor.2020.00060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 04/28/2020] [Indexed: 12/11/2022] Open
Abstract
The menopausal transition is accompanied by changes in adipose tissue storage, leading to an android body composition associated with increased risk of type 2 diabetes and cardiovascular disease in post-menopausal women. Estrogens probably affect local adipose tissue depots differently. We investigated how menopausal status and exercise training influence adipose tissue mass, adipose tissue insulin sensitivity and adipose tissue proteins associated with lipogenesis/lipolysis and mitochondrial function. Healthy, normal-weight pre- (n = 21) and post-menopausal (n = 20) women participated in high-intensity exercise training three times per week for 12 weeks. Adipose tissue distribution was determined by dual-energy x-ray absorptiometry and magnetic resonance imaging. Adipose tissue glucose uptake was assessed by positron emission tomography/computed tomography (PET/CT) by the glucose analog [18F]fluorodeoxyglucose ([18F]FDG) during continuous insulin infusion (40 mU·m−2·min−1). Protein content associated with insulin signaling, lipogenesis/lipolysis, and mitochondrial function were determined by western blotting in abdominal and femoral white adipose tissue biopsies. The mean age difference between the pre- and the post-menopausal women was 4.5 years. Exercise training reduced subcutaneous (~4%) and visceral (~6%) adipose tissue masses similarly in pre- and post-menopausal women. Insulin-stimulated glucose uptake, assessed by [18F]FDG-uptake during PET/CT, was similar in pre- and post-menopausal women in abdominal, gluteal, and femoral adipose tissue depots, despite skeletal muscle insulin resistance in post- compared to pre-menopausal women in the same cohort. Insulin-stimulated glucose uptake in adipose tissue depots was not changed after 3 months of high-intensity exercise training, but insulin sensitivity was higher in visceral compared to subcutaneous adipose tissue depots (~139%). Post-menopausal women exhibited increased hexokinase and adipose triglyceride lipase content in subcutaneous abdominal adipose tissue. Physical activity in the early post-menopausal years reduces abdominal obesity, but insulin sensitivity of adipose tissue seems unaffected by both menopausal status and physical activity.
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Affiliation(s)
- Camilla M Mandrup
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Caroline B Roland
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Jon Egelund
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Michael Nyberg
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Lotte Hahn Enevoldsen
- Department of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet, Copenhagen, Denmark
| | - Andreas Kjaer
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet, Copenhagen, Denmark
| | - Andreas Clemmensen
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet, Copenhagen, Denmark
| | - Anders Nymark Christensen
- Department of Applied Mathematics and Computer Science, Technical University of Denmark, Copenhagen, Denmark
| | - Charlotte Suetta
- Department of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet, Copenhagen, Denmark.,Geriatric Research Unit, Herlev-Gentofte & Frederiksberg-Bispebjerg Hospitals, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Ruth Frikke-Schmidt
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark
| | | | | | | | - Ylva Hellsten
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Bente Stallknecht
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
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5
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Abstract
Regional adipose tissue distribution differs between men and women. Differences in the accumulation of adipose tissue as well as the regulation of secretion of a number of products from adipose tissue are under the control of sex steroids, which act through a wide variety of mechanisms, both direct and indirect, to tailor metabolism to the unique needs of each sex. A fuller understanding of sex-based differences in adipose tissue function may help with tailored strategies for disease prevention and treatment and provide insights into fundamental differences in the processes that regulate nutrient homeostasis and body weight.
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Affiliation(s)
- Kathleen M Gavin
- Division of Geriatric Medicine, Department of Medicine, Eastern Colorado VA Geriatric, Research, Education, and Clinical Center (GRECC), University of Colorado Anschutz Medical Campus, 12631 East 17th Avenue, Aurora, CO 80045, USA
| | - Daniel H Bessesen
- Division of Endocrinology, Metabolism, and Diabetes, Anschutz Health and Wellness Center, University of Colorado, School of Medicine, 12348 East Montview Boulevard, Aurora, CO 80045, USA.
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Kelsey MM, Braffett BH, Geffner ME, Levitsky LL, Caprio S, McKay SV, Shah R, Sprague JE, Arslanian SA. Menstrual Dysfunction in Girls From the Treatment Options for Type 2 Diabetes in Adolescents and Youth (TODAY) Study. J Clin Endocrinol Metab 2018; 103:2309-2318. [PMID: 29697830 PMCID: PMC6276678 DOI: 10.1210/jc.2018-00132] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 04/02/2018] [Indexed: 12/14/2022]
Abstract
CONTEXT Little is known about reproductive function in girls with youth-onset type 2 diabetes. OBJECTIVES To characterize girls with irregular menses and effects of glycemic treatments on menses and sex steroids in the Treatment Options for Type 2 Diabetes in Youth (TODAY) study. DESIGN Differences in demographic, metabolic, and hormonal characteristics between regular- vs irregular-menses groups were tested; treatment group (metformin with or without rosiglitazone, metformin plus lifestyle) effect on menses and sex steroids over time in the study was assessed. This is a secondary analysis of TODAY data. SETTING Multicenter study in an academic setting. PATIENTS TODAY girls not receiving hormonal contraception and those at least 1-year postmenarche were included. Irregular menses was defined as three or fewer periods in the prior 6 months. RESULTS Of eligible participants with serum measurement of sex steroids (n = 190; mean age, 14 years), 21% had irregular menses. Those with irregular vs regular menses had higher body mass index (BMI) (P = 0.001), aspartate aminotransferase (AST) (P = 0.001), free androgen index (P = 0.0003), and total testosterone (P = 0.01) and lower sex hormone-binding globulin (SHBG) (P = 0.004) and estradiol (P = 0.01). Differences remained after adjustment for BMI. There was no treatment group effect on menses or sex steroids at 12 or 24 months, and no association of sex steroids was seen with measures of insulin sensitivity or secretion. CONCLUSIONS Menstrual dysfunction is common in girls with recently diagnosed type 2 diabetes and associated with alterations in sex steroids, SHBG, and AST but not with alteration in insulin sensitivity or β-cell function and did not improve with 2 years of antihyperglycemic treatment.
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Affiliation(s)
- Megan M Kelsey
- Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado
| | - Barbara H Braffett
- Biostatistics Center, George Washington University, Washington, DC
- Correspondence and Reprint Requests: Barbara H. Braffett, PhD, 6110 Executive Boulevard Suite 750, Rockville, Maryland 20852. E-mail:
| | - Mitchell E Geffner
- The Saban Research Center, Children’s Hospital Los Angeles, Keck School of Medicine of University of Southern California, Los Angeles, California
| | - Lynne L Levitsky
- Division of Pediatric Endocrinology, Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Sonia Caprio
- Department of Pediatric Endocrinology, Yale School of Medicine, New Haven, Connecticut
| | - Siripoom V McKay
- Division of Pediatric Endocrinology, Baylor College of Medicine, Texas Children's Hospital, Houston, Texas
| | - Rachana Shah
- Division of Endocrinology and Diabetes, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
| | | | - Silva A Arslanian
- University of Pittsburgh, Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, Pennsylvania
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Regitz-Zagrosek V, Kararigas G. Mechanistic Pathways of Sex Differences in Cardiovascular Disease. Physiol Rev 2017; 97:1-37. [PMID: 27807199 DOI: 10.1152/physrev.00021.2015] [Citation(s) in RCA: 395] [Impact Index Per Article: 56.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Major differences between men and women exist in epidemiology, manifestation, pathophysiology, treatment, and outcome of cardiovascular diseases (CVD), such as coronary artery disease, pressure overload, hypertension, cardiomyopathy, and heart failure. Corresponding sex differences have been studied in a number of animal models, and mechanistic investigations have been undertaken to analyze the observed sex differences. We summarize the biological mechanisms of sex differences in CVD focusing on three main areas, i.e., genetic mechanisms, epigenetic mechanisms, as well as sex hormones and their receptors. We discuss relevant subtypes of sex hormone receptors, as well as genomic and nongenomic, activational and organizational effects of sex hormones. We describe the interaction of sex hormones with intracellular signaling relevant for cardiovascular cells and the cardiovascular system. Sex, sex hormones, and their receptors may affect a number of cellular processes by their synergistic action on multiple targets. We discuss in detail sex differences in organelle function and in biological processes. We conclude that there is a need for a more detailed understanding of sex differences and their underlying mechanisms, which holds the potential to design new drugs that target sex-specific cardiovascular mechanisms and affect phenotypes. The comparison of both sexes may lead to the identification of protective or maladaptive mechanisms in one sex that could serve as a novel therapeutic target in one sex or in both.
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Affiliation(s)
- Vera Regitz-Zagrosek
- Institute of Gender in Medicine & Center for Cardiovascular Research, Charite University Hospital, and DZHK (German Centre for Cardiovascular Research), Berlin, Germany
| | - Georgios Kararigas
- Institute of Gender in Medicine & Center for Cardiovascular Research, Charite University Hospital, and DZHK (German Centre for Cardiovascular Research), Berlin, Germany
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8
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Hodson L, Banerjee R, Rial B, Arlt W, Adiels M, Boren J, Marinou K, Fisher C, Mostad IL, Stratton IM, Barrett PHR, Chan DC, Watts GF, Harnden K, Karpe F, Fielding BA. Menopausal Status and Abdominal Obesity Are Significant Determinants of Hepatic Lipid Metabolism in Women. J Am Heart Assoc 2015; 4:e002258. [PMID: 26432801 PMCID: PMC4845132 DOI: 10.1161/jaha.115.002258] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Background Android fat distribution (abdominal obesity) is associated with insulin resistance, hepatic steatosis, and greater secretion of large very low‐density lipoprotein (VLDL) particles in men. Since abdominal obesity is becoming increasingly prevalent in women, we aimed to investigate the relationship between android fat and hepatic lipid metabolism in pre‐ and postmenopausal women. Methods and Results We used a combination of stable isotope tracer techniques to investigate intrahepatic fatty acid synthesis and partitioning in 29 lean and 29 abdominally obese women (android fat/total fat 0.065 [0.02 to 0.08] and 0.095 [0.08 to 0.11], respectively). Thirty women were premenopausal aged 35 to 45 and they were matched for abdominal obesity with 28 postmenopausal women aged 55 to 65. As anticipated, abdominal obese women were more insulin resistant with enhanced hepatic secretion of large (404±30 versus 268±26 mg/kg lean mass, P<0.001) but not small VLDL (160±11 versus 142±13). However, postmenopausal status had a pronounced effect on the characteristics of small VLDL particles, which were considerably triglyceride‐enriched (production ratio of VLDL2‐ triglyceride:apolipoprotein B 30±5.3 versus 19±1.6, P<0.05). In contrast to postmenopausal women, there was a tight control of hepatic fatty acid metabolism and triglyceride production in premenopausal women, whereby oxidation (rs=−0.49, P=0.006), de novo lipogenesis (rs=0.55, P=0.003), and desaturation (rs=0.48, P=0.012) were closely correlated with abdominal obesity‐driven large VLDL‐triglyceride secretion rate. Conclusions In women, abdominal obesity is a major driver of hepatic large VLDL particle secretion, whereas postmenopausal status was characterized by increased small VLDL particle size. These data provide a mechanistic basis for the hyperlipidemia observed in postmenopausal obesity.
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Affiliation(s)
- Leanne Hodson
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Oxford, UK (L.H., K.M., K.H., F.K., B.A.F.)
| | - Rajarshi Banerjee
- Division of Cardiovascular Medicine, Oxford Centre for Clinical Magnetic Resonance Research, John Radcliffe Hospital, Oxford, UK (R.B., B.R.)
| | - Belén Rial
- Division of Cardiovascular Medicine, Oxford Centre for Clinical Magnetic Resonance Research, John Radcliffe Hospital, Oxford, UK (R.B., B.R.)
| | - Wiebke Arlt
- Centre for Endocrinology, Diabetes and Metabolism, School of Clinical & Experimental Medicine, University of Birmingham, UK (W.A.)
| | - Martin Adiels
- Department of Molecular and Clinical Medicine, University of Gothenburg, Sweden (M.A.) Department of Mathematical Sciences, University of Gothenburg, Sweden (M.A., J.B.)
| | - Jan Boren
- Department of Mathematical Sciences, University of Gothenburg, Sweden (M.A., J.B.)
| | - Kyriakoula Marinou
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Oxford, UK (L.H., K.M., K.H., F.K., B.A.F.) Department of Experimental Physiology, Athens University School of Medicine, Athens, Greece (K.M.)
| | - Ciaran Fisher
- Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK (C.F., B.A.F.)
| | - Ingrid L Mostad
- Department of Clinical Nutrition, Clinic of Clinical Service, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway (I.L.M.) Department of Cancer Research and Molecular Medicine, Faculty of Medicine, NTNU, Trondheim, Norway (I.L.M.)
| | - Irene M Stratton
- Gloucestershire Diabetic Retinopathy Research Group, Cheltenham General Hospital, Gloucestershire, UK (I.M.S.)
| | - P Hugh R Barrett
- Metabolic Research Centre, School of Medicine and Pharmacology, University of Western Australia, Perth, WA, Australia (H.R.B., D.C.C., G.F.W.) Faculty of Engineering, Computing and Mathematics, University of Western Australia, Perth, WA, Australia (H.R.B.)
| | - Dick C Chan
- Metabolic Research Centre, School of Medicine and Pharmacology, University of Western Australia, Perth, WA, Australia (H.R.B., D.C.C., G.F.W.)
| | - Gerald F Watts
- Metabolic Research Centre, School of Medicine and Pharmacology, University of Western Australia, Perth, WA, Australia (H.R.B., D.C.C., G.F.W.)
| | - Karin Harnden
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Oxford, UK (L.H., K.M., K.H., F.K., B.A.F.)
| | - Fredrik Karpe
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Oxford, UK (L.H., K.M., K.H., F.K., B.A.F.) National Institute for Health Research Oxford Biomedical Research Centre, Oxford University Hospital Trusts, Oxford, UK (F.K.)
| | - Barbara A Fielding
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Oxford, UK (L.H., K.M., K.H., F.K., B.A.F.) Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK (C.F., B.A.F.)
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9
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Santosa S, Jensen MD. The Sexual Dimorphism of Lipid Kinetics in Humans. Front Endocrinol (Lausanne) 2015; 6:103. [PMID: 26191040 PMCID: PMC4489151 DOI: 10.3389/fendo.2015.00103] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Accepted: 06/13/2015] [Indexed: 12/02/2022] Open
Abstract
In addition to the obvious differences in body shape, there are substantial differences in lipid metabolism between men and women. These differences include how dietary fatty acids are handled, the secretion and clearance of very low-density lipoprotein-triglycerides, the release rates of free fatty acids (FFA) from adipose tissue relative to energy needs, and the removal of FFA from the circulation, including the storage of FFA into adipose tissue via the direct uptake process. We will review what is known about these processes and how they may contribute to the sexual dimorphism of body fat distribution.
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Affiliation(s)
- Sylvia Santosa
- Department of Exercise Science, Concordia University, Montreal, QC, Canada
- Nutrition, Obesity, and Metabolism Laboratory, PERFORM Centre, Montreal, QC, Canada
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10
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Zaman GS, Zaman F. Relationship between postprandial endotoxemia in nonobese postmenopausal women and diabetic nonobese postmenopausal women. J Nat Sci Biol Med 2015; 6:89-93. [PMID: 25810642 PMCID: PMC4367076 DOI: 10.4103/0976-9668.149098] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Background: We hypothesised that nonobese postmenopausal women (NoPoW) and diabetic NoPoW (DNoPoW) may be independently associated with postprandial endotoxemia. Materials and Methods: NoPoW and DNoPoW were evaluated for weight, eating habits, physical activity, body circumferences, fasting plasma glucose level, postprandial plasma glucose level, and insulin level. The lipopolysaccharide (LPS) levels and circulating LPS-binding protein (LBP) were determined in serum at fasting, 1 h, 2 h, 3 h, and 4 h after meal intake and their levels were co-related in 80 NoPoW and 80 DNoPoW. Results: Both DNoPoW group and NoPoW group showed a significant increase (P < 0.05) in LPS levels and circulating LBP in plasma after the meal intake, interestingly the increase was higher in the DNoPoW group. Conclusions: Elevated LPS and circulating LBP were associated significantly with DNoPoW group and NoPoW, especially after a meal intake. These findings suggested a role of LPS and LBP in postprandial systemic inflammation in DNoPoW group. Prospective studies are needed to confirm these results.
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Affiliation(s)
- Gaffar Sarwar Zaman
- Department of Clinical Biochemistry, Government College of Medicine, King Khalid University, Abha, Kingdom of Saudi Arabia
| | - Fawzia Zaman
- Head of Operations and Quality Manager Ekopath Metropolis, Guwahati, Assam, India
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11
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Kim JH, Cho HT, Kim YJ. The role of estrogen in adipose tissue metabolism: insights into glucose homeostasis regulation. Endocr J 2014; 61:1055-67. [PMID: 25109846 DOI: 10.1507/endocrj.ej14-0262] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Adipose tissue is an organ with active endocrine function involved in the regulation of energy balance and glucose homeostasis via multiple metabolic signaling pathways targeting the brain, liver, skeletal muscle, pancreas, and other organs. There is increasing evidence demonstrating that the female sex hormone, estrogen, regulates adipose development and improves systemic glucose homeostasis in both males and females. The underlying mechanism linking estrogenic regulation in adipose tissue and systemic glucose metabolism has not been fully elucidated, but is thought to include interactions of estrogen receptor signaling events involving lipolytic and/or lipogenic enzyme activity, free fatty acid metabolism, and adipocytokine production. Thus, understanding the effects of estrogen replacement on adipose tissue biology and metabolism is important in determining the risk of developing obesity-related metabolic disorders in patients undergoing treatment for sex hormone deficiency. In this report, we review literature regarding the role of estrogens and their corresponding receptors in the control of adipose metabolism and glucose homeostasis in both rodents and humans. We also discuss the effects of selective estrogen receptor modulators on glucose metabolism.
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Affiliation(s)
- Jun Ho Kim
- Department of Food and Biotechnology, Korea University, Sejong 339-700, Republic of Korea
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12
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Abstract
Increases in weight have been associated with corresponding increases in insulin resistance in postmenopausal women. Although estrogen has significant impact on body fat and body fat distribution, the cellular mechanisms that influence this process are not yet known. We measured adipose tissue fatty acid (FA) storage and FA storage factors in 12 premenopausal and 11 postmenopausal women matched for age and body composition. Postmenopausal women had lower postprandial FA oxidation (indirect calorimetry), greater meal FA, and direct free FA (FFA) storage than premenopausal women, including two-fold greater meal FA storage in the femoral depot. The fed/fasted activities of adipose tissue lipoprotein lipase were not significantly different between premenopausal and postmenopausal women. In contrast, adipocyte acyl-CoA synthetase and diacylglycerol acyltransferase activities in postmenopausal women were significantly upregulated and were positively correlated with direct FFA storage rates. These findings suggest that the propensity for subcutaneous adipose tissue FA storage is increased in postmenopausal women, more so from changes in adipocyte FA storage factors than from adipose tissue lipoprotein lipase activity. Our results suggest that female sex steroids, most likely estrogen, have important effects on adipose tissue FA storage and FA oxidation that could promote fat gain in postmenopausal women.
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Affiliation(s)
- Sylvia Santosa
- Endocrine Research Unit, Mayo Clinic, Rochester, Minnesota
- Department of Exercise Science, Concordia University, Montreal, Quebec, Canada
| | - Michael D. Jensen
- Endocrine Research Unit, Mayo Clinic, Rochester, Minnesota
- Corresponding author: Michael D. Jensen,
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13
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Abstract
Excess intra-abdominal adipose tissue accumulation, often termed visceral obesity, is part of a phenotype including dysfunctional subcutaneous adipose tissue expansion and ectopic triglyceride storage closely related to clustering cardiometabolic risk factors. Hypertriglyceridemia; increased free fatty acid availability; adipose tissue release of proinflammatory cytokines; liver insulin resistance and inflammation; increased liver VLDL synthesis and secretion; reduced clearance of triglyceride-rich lipoproteins; presence of small, dense LDL particles; and reduced HDL cholesterol levels are among the many metabolic alterations closely related to this condition. Age, gender, genetics, and ethnicity are broad etiological factors contributing to variation in visceral adipose tissue accumulation. Specific mechanisms responsible for proportionally increased visceral fat storage when facing positive energy balance and weight gain may involve sex hormones, local cortisol production in abdominal adipose tissues, endocannabinoids, growth hormone, and dietary fructose. Physiological characteristics of abdominal adipose tissues such as adipocyte size and number, lipolytic responsiveness, lipid storage capacity, and inflammatory cytokine production are significant correlates and even possible determinants of the increased cardiometabolic risk associated with visceral obesity. Thiazolidinediones, estrogen replacement in postmenopausal women, and testosterone replacement in androgen-deficient men have been shown to favorably modulate body fat distribution and cardiometabolic risk to various degrees. However, some of these therapies must now be considered in the context of their serious side effects. Lifestyle interventions leading to weight loss generally induce preferential mobilization of visceral fat. In clinical practice, measuring waist circumference in addition to the body mass index could be helpful for the identification and management of a subgroup of overweight or obese patients at high cardiometabolic risk.
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Affiliation(s)
- André Tchernof
- Endocrinology and Genomics Axis, Centre Hospitalier Universitaire de Québec, Québec, Canada
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Gormsen LC, Høst C, Hjerrild BE, Pedersen SB, Nielsen S, Christiansen JS, Gravholt CH. Estradiol acutely inhibits whole body lipid oxidation and attenuates lipolysis in subcutaneous adipose tissue: a randomized, placebo-controlled study in postmenopausal women. Eur J Endocrinol 2012; 167:543-51. [PMID: 22872467 DOI: 10.1530/eje-12-0422] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
CONTEXT Estradiol (E(2)) promotes and maintains the female phenotype characterized by subcutaneous fat accumulation. There is evidence to suggest that this effect is due to increased anti-lipolytic α2A-adrenergic receptors, but whether this requires long-term exposure to E(2) or is an immediate effect is not clear. OBJECTIVE To study acute effects of a single dose (4 mg) of 17β-E(2) on regional and systemic lipolysis. METHODS Sixteen postmenopausal women (age, 595 years; weight, 6710 kg; and BMI, 24.82.9) were studied in a crossover design: i) placebo and ii) 4 mg E(2). Basal and adrenaline-stimulated regional lipolysis was assessed by microdialysis and substrate oxidation rates by indirect calorimetry. Tissue biopsies were obtained to assess lipoprotein lipase activity and mRNA expression of adrenergic, estrogen, cytokine, and vascular reactivity receptors. RESULTS Acute E(2) stimulation significantly attenuated catecholamine-stimulated lipolysis in femoral subcutaneous adipose tissue (interstitial glycerol concentration (micromole/liter) ANOVA time vs treatment interaction, P=0.01) and lipolysis in general in abdominal adipose tissue (ANOVA treatment alone, P<0.05). E(2) also reduced basal lipid oxidation ((mg/kg per min) placebo, 0.58 ± 0.06 vs E(2), 0.45 ± 0.03; P=0.03) and induced a significantly higher expression of anti-lipolytic α2A-adrenergic receptor mRNA (P=0.02) in skeletal muscle tissue as well as an upregulation of eNOS (NOS3) mRNA (P=0.02). CONCLUSION E(2) acutely attenuates the lipolytic response to catecholamines in subcutaneous adipose tissue, shifts muscular adrenergic receptor mRNA toward anti-lipolytic α2A-receptors, decreases whole body lipid oxidation, and enhances expression of markers of vascular reactivity.
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Affiliation(s)
- Lars Christian Gormsen
- Medical Research Laboratories, Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Nørrebrogade, DK-8000 Aarhus C, Denmark.
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15
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Liu PY, Erkkila K, Lue Y, Jentsch JD, Schwarcz MD, Abuyounes D, Hikim AS, Wang C, Lee PWN, Swerdloff RS. Genetic, hormonal, and metabolomic influences on social behavior and sex preference of XXY mice. Am J Physiol Endocrinol Metab 2010; 299:E446-55. [PMID: 20570823 PMCID: PMC2944286 DOI: 10.1152/ajpendo.00085.2010] [Citation(s) in RCA: 25] [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] [Indexed: 11/22/2022]
Abstract
XXY men (Klinefelter syndrome) are testosterone deficient, socially isolated, exhibit impaired gender identity, and may experience more homosexual behaviors. Here, we characterize social behaviors in a validated XXY mouse model to understand mechanisms. Sociability and gender preference were assessed by three-chambered choice tasks before and after castration and after testosterone replacement. Metabolomic activities of brain and blood were quantified through fractional synthesis rates of palmitate and ribose (GC-MS). XXY mice exhibit greater sociability than XY littermates, particularly for male mice. The differences in sociability disappear after matching androgen exposure. Intact XXY, compared with XY, mice prefer male mice odors when the alternatives are ovariectomized female mice odors, but they prefer estrous over male mice odors, suggesting that preference for male mice may be due to social, not sexual, cues. Castration followed by testosterone treatment essentially remove these preferences. Fractional synthesis rates of palmitate are higher in the hypothalamus, amygdala, and hippocampus of XXY compared with XY mice but not with ribose in these brain regions or palmitate in blood. Androgen ablation in XY mice increases fractional synthesis rates of fatty acids in the brain to levels indistinguishable from those in XXY mice. We conclude that intact XXY mice exhibit increased sociability, differences in gender preference for mice and their odors are due to social rather than sexual cues and, these differences are mostly related to androgen deficiency rather than genetics. Specific metabolic changes in brain lipids, which are also regulated by androgens, are observed in brain regions that are involved in these behaviors.
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Affiliation(s)
- Peter Y Liu
- Department of Medicine, Harbor-UCLA Medical Center and Los Angeles Biomedical Research Institute, Torrance, California, USA.
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Daniel CR, McCullough ML, Patel RC, Jacobs EJ, Flanders WD, Thun MJ, Calle EE. Dietary Intake of ω-6 and ω-3 Fatty Acids and Risk of Colorectal Cancer in a Prospective Cohort of U.S. Men and Women. Cancer Epidemiol Biomarkers Prev 2009; 18:516-25. [DOI: 10.1158/1055-9965.epi-08-0750] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Van Pelt RE, Gozansky WS, Hickner RC, Schwartz RS, Kohrt WM. Acute modulation of adipose tissue lipolysis by intravenous estrogens. Obesity (Silver Spring) 2006; 14:2163-72. [PMID: 17189542 PMCID: PMC2832608 DOI: 10.1038/oby.2006.253] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
OBJECTIVE The aim of this study was to determine whether intravenous (IV) conjugated estrogens (EST) acutely enhance the suppression of whole-body or regional subcutaneous adipose tissue (SAT) lipolysis by insulin in postmenopausal women. RESEARCH METHODS AND PROCEDURES We assessed whole-body lipolysis by [(2)H(5)]glycerol rate of appearance (Glyc(RA)) and abdominal and femoral SAT lipolysis (interstitial glycerol; Glyc(IS)) by subcutaneous microdialysis. Postmenopausal women (n = 12) were studied on two occasions, with IV EST or saline control (CON), under basal conditions and during a 3-stage (4, 8, and 40 mU/m(2)/min) hyperinsulinemic, euglycemic clamp. Ethanol outflow/inflow ratio and recovery of [(13)C]glycerol during microdialysis were used to assess blood flow changes and interstitial glycerol concentrations, respectively. RESULTS Compared with CON, EST did not affect systemic basal or insulin-mediated suppression of lipolysis (Glyc(RA)) or SAT nutritive blood flow. Basal Glyc(IS) in SAT was reduced on the EST day. However, insulin-mediated suppression of lipolysis in SAT was not significantly influenced by EST. DISCUSSION These findings suggest that estrogens acutely reduce basal lipolysis in SAT through an unknown mechanism but do not alter whole-body or SAT suppression of lipolysis by insulin.
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Affiliation(s)
- Rachael E Van Pelt
- Department of Medicine, Division of Geriatric Medicine, University of Colorado at Denver and Health Sciences Center, 4200 E. Ninth Ave., Campus Box B-179, Denver, CO 80262, USA.
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Horton TJ, Miller EK, Bourret K. No effect of menstrual cycle phase on glycerol or palmitate kinetics during 90 min of moderate exercise. J Appl Physiol (1985) 2006; 100:917-25. [PMID: 16467391 DOI: 10.1152/japplphysiol.00491.2005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The systemic flux of glycerol and palmitate [a representative nonesterified free fatty acid (NEFA)] was assessed in three different phases of the menstrual cycle at rest and during moderate-intensity exercise. It was hypothesized that circulating glycerol and NEFA turnover would be greatest in the midfollicular (MF) phase of the menstrual cycle, when estrogen is elevated but progesterone low, followed by the midluteal phase (ML; high estrogen and progesterone), and lowest in the early follicular (EF) phase of the menstrual cycle (low estrogen and progesterone). Subjects included moderately active, eumenorrheic, healthy women. Testing occurred after 3 days of diet control and after an overnight fast (12-13 h). Resting and exercise (50% maximal oxygen uptake, 90 min) measurements of tracer-determined glycerol and palmitate kinetics were made. There was a significant increase in both glycerol and palmitate turnover from rest to exercise in all phases of the menstrual cycle (P<0.0001). No significant differences, however, were observed between cycle phases in the systemic flux of glycerol or palmitate, at rest or during exercise. Maximal peripheral lipolysis during exercise, as represented by glycerol rate of appearance at 90 min, equaled 8.45+/-0.96, 8.35+/-1.12, and 7.71+/-0.96 micromol.kg-1.min-1 in the EF, MF, and ML phases, respectively. Circulating free fatty acid utilization also peaked at 90 min of exercise, as indicated by the palmitate rate of disappearance (3.31+/-0.35, 3.17+/-0.39, and 3.47+/-0.26 micromol.kg-1.min-1) in the EF, MF, and ML phases, respectively. In conclusion, systemic rates of glycerol and NEFA turnover (as represented by palmitate flux) were not significantly affected by the cyclic fluctuations in estrogen and progesterone that occur throughout the normal menstrual cycle, either at rest or during 90 min of moderate exercise.
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Affiliation(s)
- Tracy J Horton
- Department of Pediatrics, Campus Box C225, Univ. of Colorado Health Sciences Center, 4200 East 9th Ave., Denver, CO 80262, USA.
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Braun B, Gerson L, Hagobian T, Grow D, Chipkin SR. No effect of short-term testosterone manipulation on exercise substrate metabolism in men. J Appl Physiol (1985) 2005; 99:1930-7. [PMID: 15994239 DOI: 10.1152/japplphysiol.00565.2005] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Compared with women, men use proportionately more carbohydrate and less fat during exercise at the same relative intensity. Estrogen and progesterone have potent effects on substrate use during exercise in women, but the role of testosterone (T) in mediating substrate use is unknown. The purpose of this investigation was to assess how large variations in the concentration of blood T would impact substrate use during exercise in men. Nine healthy, active men were studied in three distinct hormonal conditions: physiological T (no intervention), low T (pharmacological suppression of endogenous T with a gonadotrophin-releasing hormone antagonist), and high T (supplementation with transdermal T). Total carbohydrate oxidation, blood glucose rate of disappearance, and estimated muscle glycogen use were assessed by using stable isotope dilution and indirect calorimetry at rest and while bicycling at ∼60% of peak O2 consumption for 90 min. Relative to the physiological condition (T = 5.5 ± 0.5 ng/ml), total plasma T was considerably suppressed in low T (0.8 ± 0.1) and elevated in high T (10.9 ± 1.1). Despite the large changes in plasma T, carbohydrate oxidation, glucose rate of disappearance, and estimated muscle glycogen use were very similar across the three conditions. There were also no differences in plasma concentrations of glucose, insulin, lactate, or free fatty acids. Plasma estradiol (E) concentrations were elevated in high T, but correlations between substrate use and plasma concentrations of T, E, or the T-to-E ratio were very weak ( r2 < 0.20). In conclusion, unlike the effect of acute elevation in E to constrain carbohydrate use in women, acute changes in circulating T concentrations do not appear to alter substrate use during exercise in men.
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Affiliation(s)
- Barry Braun
- Department of Exercise Science, 106 Totman Bldg., University of Massachusetts, Amherst, MA 01003, USA.
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Van Pelt RE, Gozansky WS, Schwartz RS, Kohrt WM. Intravenous estrogens increase insulin clearance and action in postmenopausal women. Am J Physiol Endocrinol Metab 2003; 285:E311-7. [PMID: 12684221 PMCID: PMC2819703 DOI: 10.1152/ajpendo.00490.2002] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
To test the hypothesis that estrogens alter insulin action, we evaluated the effects of intravenous conjugated estrogens (CE) on insulin-stimulated steady-state glucose infusion rate (SSGIR) and suppression of plasma glycerol in postmenopausal women (mean +/- SD; 56 +/- 4 yr; n = 12) not using hormone replacement. SSGIR and glycerol were measured during a two-stage (8 and 40 mU. m-2. min-1) hyperinsulinemic euglycemic clamp on 2 days, with or without a 2.5-mg intravenous CE bolus. Serum estradiol concentrations were increased approximately 200% on the estrogen (EST) compared with the control (CON) days. Serum insulin was reduced (P < 0.01) during stage 2 of the clamp for EST (63.3 +/- 12.8 micro U/ml) vs. CON (78.2 +/- 15.8 micro U/ml). Mean SSGIR and plasma glycerol did not differ between CON and EST days. With adjustment for differences in insulin concentration between conditions, stage 2 glucose disposals were significantly higher (8.63 vs. 7.20 mg. kg-1. min-1) and plasma glycerol concentrations were significantly lower (29.4 vs. 35.0 micro mol/l) for EST vs. CON. Our findings suggest that acute CE administration increases insulin clearance and action in postmenopausal women.
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