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Lyu H, Sugita N, Komatsu S, Wakasugi M, Yokoseki A, Yoshihara A, Kobayashi T, Sato K, Kawashima H, Onodera O, Narita I, Tabeta K. UCP2 polymorphisms, daily step count, and number of teeth associated with all-cause mortality risk in Sado City: A hospital-based cohort study. Heliyon 2024; 10:e32512. [PMID: 38952382 PMCID: PMC11215260 DOI: 10.1016/j.heliyon.2024.e32512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 05/13/2024] [Accepted: 06/05/2024] [Indexed: 07/03/2024] Open
Abstract
Objective Uncoupling protein 2 (UCP2) is an ion/anion transporter in the mitochondrial inner membrane that plays a crucial role in immune response, regulation of oxidative stress, and cellular metabolism. UCP2 polymorphisms are linked to chronic inflammation, obesity, diabetes, heart disease, exercise efficiency, and longevity. Daily step count and number of teeth are modifiable factors that reduce mortality risk, although the role of UCP2 in this mechanism is unknown. This study aimed to assess the possible effects of UCP2 polymorphisms on the association between daily step count and number of teeth with all-cause mortality. Methods This study was conducted as a cohort project involving adult Japanese outpatients at Sado General Hospital (PROST). The final number of participants was 875 (mean age: 69 y). All-cause mortality during thirteen years (from June 2008 to August 2021) was recorded. The functional UCP2 genotypes rs659366 and rs660339 were identified using the Japonica Array®. Survival analyses were performed using multivariate Cox proportional hazard models. Results There were 161 deaths (mean observation period: 113 months). Age, sex, daily step count, and the number of teeth were significantly associated with mortality. In females, UCP2 polymorphisms were associated with mortality independent of other factors (rs659366 GA compared to GG + AA; HR = 2.033, p = 0.019, rs660339 C T compared to CC + TT; HR = 1.911, p = 0.029). Multivariate models, with and without UCP2 genotypes, yielded similar results. The interaction terms between UCP2 genotype and daily step count or number of teeth were not significantly associated with mortality. Conclusion The effects of UCP2 polymorphisms on the association between daily step count or the number of teeth and all-cause mortality were not statistically significant. In females, UCP2 polymorphisms were significantly associated with all-cause mortality. Our findings confirmed the importance of physical activity and oral health and suggested a role of UCP2 in mortality risk independently with those factors.
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Affiliation(s)
- Han Lyu
- Division of Periodontology, Department of Oral Biological Science, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Noriko Sugita
- Division of Periodontology, Department of Oral Biological Science, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | | | - Minako Wakasugi
- Department of Inter-Organ Communication Research, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Akio Yokoseki
- Department of Inter-Organ Communication Research, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Akihiro Yoshihara
- Division of Oral Science and Health Promotion, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Tetsuo Kobayashi
- Division of Periodontology, Department of Oral Biological Science, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
- General Dentistry and Clinical Education Unit, Faculty of Dentistry & Medical and Dental Hospital, Niigata University, Niigata, Japan
| | | | - Hiroyuki Kawashima
- Division of Orthopedic Surgery, Niigata University Graduate School of Medical and Dental Science, Niigata, Japan
| | - Osamu Onodera
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Ichiei Narita
- Division of Clinical Nephrology and Rheumatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Koichi Tabeta
- Division of Periodontology, Department of Oral Biological Science, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
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Marques D, Ferreira-Costa LR, Ferreira-Costa LL, Correa RDS, Borges AMP, Ito FR, Ramos CCDO, Bortolin RH, Luchessi AD, Ribeiro-dos-Santos Â, Santos S, Silbiger VN. Association of insertion-deletions polymorphisms with colorectal cancer risk and clinical features. World J Gastroenterol 2017; 23:6854-6867. [PMID: 29085228 PMCID: PMC5645618 DOI: 10.3748/wjg.v23.i37.6854] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 06/24/2017] [Accepted: 08/15/2017] [Indexed: 02/06/2023] Open
Abstract
AIM To investigate the association between 16 insertion-deletions (INDEL) polymorphisms, colorectal cancer (CRC) risk and clinical features in an admixed population.
METHODS One hundred and forty patients with CRC and 140 cancer-free subjects were examined. Genomic DNA was extracted from peripheral blood samples. Polymorphisms and genomic ancestry distribution were assayed by Multiplex-PCR reaction, separated by capillary electrophoresis on the ABI 3130 Genetic Analyzer instrument and analyzed on GeneMapper ID v3.2. Clinicopathological data were obtained by consulting the patients’ clinical charts, intra-operative documentation, and pathology scoring.
RESULTS Logistic regression analysis showed that polymorphism variations in IL4 gene was associated with increased CRC risk, while TYMS and UCP2 genes were associated with decreased risk. Reference to anatomical localization of tumor Del allele of NFKB1 and CASP8 were associated with more colon related incidents than rectosigmoid. In relation to the INDEL association with tumor node metastasis (TNM) stage risk, the Ins alleles of ACE, HLAG and TP53 (6 bp INDEL) were associated with higher TNM stage. Furthermore, regarding INDEL association with relapse risk, the Ins alleles of ACE, HLAG, and UGT1A1 were associated with early relapse risk, as well as the Del allele of TYMS. Regarding INDEL association with death risk before 10 years, the Ins allele of SGSM3 and UGT1A1 were associated with death risk.
CONCLUSION The INDEL variations in ACE, UCP2, TYMS, IL4, NFKB1, CASP8, TP53, HLAG, UGT1A1, and SGSM3 were associated with CRC risk and clinical features in an admixed population. These data suggest that this cancer panel might be useful as a complementary tool for better clinical management, and more studies need to be conducted to confirm these findings.
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Affiliation(s)
- Diego Marques
- Laboratório de Bioanálise e Biotecnologia Molecular, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
- Programa de Pós-graduação em Ciências Farmacêutica, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
- Laboratório de Genética Humana e Médica, Universidade Federal do Pará, Belém 66055-080, Pará, Brazil
| | - Layse Raynara Ferreira-Costa
- Laboratório de Bioanálise e Biotecnologia Molecular, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
| | - Lorenna Larissa Ferreira-Costa
- Laboratório de Bioanálise e Biotecnologia Molecular, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
| | - Romualdo da Silva Correa
- Departamento de Cirurgia Oncológica, Liga Norte Riograndense Contra o Câncer, Natal 59040-000, Rio Grande do Norte, Brazil
| | - Aline Maciel Pinheiro Borges
- Departamento de Cirurgia Oncológica, Liga Norte Riograndense Contra o Câncer, Natal 59040-000, Rio Grande do Norte, Brazil
| | - Fernanda Ribeiro Ito
- Departamento de Cirurgia Oncológica, Liga Norte Riograndense Contra o Câncer, Natal 59040-000, Rio Grande do Norte, Brazil
| | - Carlos Cesar de Oliveira Ramos
- Laboratório de Patologia e Citopatologia, Liga Norte Riograndense Contra o Câncer, Natal 59040-000, Rio Grande do Norte, Brazil
| | - Raul Hernandes Bortolin
- Laboratório de Bioanálise e Biotecnologia Molecular, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
- Programa de Pós-graduação em Ciências Farmacêutica, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
| | - André Ducati Luchessi
- Laboratório de Bioanálise e Biotecnologia Molecular, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
- Departamento de Análises Clínicas e Toxicológicas, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
- Programa de Pós-graduação em Ciências Farmacêutica, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
| | - Ândrea Ribeiro-dos-Santos
- Laboratório de Genética Humana e Médica, Universidade Federal do Pará, Belém 66055-080, Pará, Brazil
- Núcleo de Pesquisas em Oncologia, Universidade Federal do Pará, Belém 66073-005, Pará, Brazil
| | - Sidney Santos
- Laboratório de Genética Humana e Médica, Universidade Federal do Pará, Belém 66055-080, Pará, Brazil
- Núcleo de Pesquisas em Oncologia, Universidade Federal do Pará, Belém 66073-005, Pará, Brazil
| | - Vivian Nogueira Silbiger
- Laboratório de Bioanálise e Biotecnologia Molecular, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
- Departamento de Análises Clínicas e Toxicológicas, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
- Programa de Pós-graduação em Ciências Farmacêutica, Universidade Federal do Rio Grande do Norte, Natal 59012-570, Rio Grande do Norte, Brazil
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Gul A, Ateş Ö, Özer S, Kasap T, Ensari E, Demir O, Sönmezgöz E. Role of the Polymorphisms of Uncoupling Protein Genes in Childhood Obesity and Their Association with Obesity-Related Disturbances. Genet Test Mol Biomarkers 2017; 21:531-538. [PMID: 28704105 DOI: 10.1089/gtmb.2017.0068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Obesity, one of the most common disorders observed in clinical practice, has been associated with energy metabolism-related protein genes such as uncoupling proteins (UCPs). Herein, we evaluated UCPs as candidate genes for obesity and its morbidities. METHODS A total of 268 obese and 185 nonobese children and adolescents were enrolled in this study. To determine dyslipidemia, hypertension, and insulin resistance, laboratory tests were derived from fasting blood samples. UCP1-3826 A/G, UCP2 exon 8 deletion/insertion (del/ins), and UCP3-55C/T variants were also genotyped, and the relationships among the polymorphisms of these UCPs and obesity morbidities were investigated. RESULTS The mean ages of the obese and control groups were 11.61 ± 2.83 and 10.74 ± 3.36 years, respectively. The respective genotypic frequencies of the AA, AG, and GG genotypes of UCP1 were 46.3%, 33.2%, and 20.5% in obese subjects and 46.5%, 42.2%, and 11.4% in the controls (p = 0.020). G alleles were more frequent in obese subjects with hypertriglyceridemia (42.9%; p = 0.048) than in those without, and the GG genotype presented an odds ratio for obesity of 2.02 (1.17-3.47; p = 0.010). The polymorphisms of UCP2 exon 8 del/ins and UCP3-55C/T did not influence obesity risk (p > 0.05). The I (ins) allele was associated with low HDL cholesterolemia (p = 0.023). CONCLUSION The GG genotype of the UCP1-3826 A/G polymorphism appears to contribute to the onset of childhood obesity in Turkish children. The GG genotype of UCP1, together with the del/del genotype of the UCP2 polymorphism, may increase the risk of obesity with synergistic effects. The ins allele of the UCP2 exon 8 del/ins polymorphism may contribute to low HDL cholesterolemia.
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Affiliation(s)
- Ali Gul
- 1 Department of Pediatrics, Gaziosmanpasa University School of Medicine , Tokat, Turkey
| | - Ömer Ateş
- 2 Department of Medical Biology and Genetics, Gaziosmanpasa University School of Medicine , Tokat, Turkey
| | - Samet Özer
- 1 Department of Pediatrics, Gaziosmanpasa University School of Medicine , Tokat, Turkey
| | - Tuba Kasap
- 1 Department of Pediatrics, Gaziosmanpasa University School of Medicine , Tokat, Turkey
| | - Emel Ensari
- 2 Department of Medical Biology and Genetics, Gaziosmanpasa University School of Medicine , Tokat, Turkey
| | - Osman Demir
- 3 Department of Biostatistics, Gaziosmanpasa University School of Medicine , Tokat, Turkey
| | - Ergün Sönmezgöz
- 1 Department of Pediatrics, Gaziosmanpasa University School of Medicine , Tokat, Turkey
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Nessa A, Rahman SA, Hussain K. Hyperinsulinemic Hypoglycemia - The Molecular Mechanisms. Front Endocrinol (Lausanne) 2016; 7:29. [PMID: 27065949 PMCID: PMC4815176 DOI: 10.3389/fendo.2016.00029] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 03/21/2016] [Indexed: 12/14/2022] Open
Abstract
Under normal physiological conditions, pancreatic β-cells secrete insulin to maintain fasting blood glucose levels in the range 3.5-5.5 mmol/L. In hyperinsulinemic hypoglycemia (HH), this precise regulation of insulin secretion is perturbed so that insulin continues to be secreted in the presence of hypoglycemia. HH may be due to genetic causes (congenital) or secondary to certain risk factors. The molecular mechanisms leading to HH involve defects in the key genes regulating insulin secretion from the β-cells. At this moment, in time genetic abnormalities in nine genes (ABCC8, KCNJ11, GCK, SCHAD, GLUD1, SLC16A1, HNF1A, HNF4A, and UCP2) have been described that lead to the congenital forms of HH. Perinatal stress, intrauterine growth retardation, maternal diabetes mellitus, and a large number of developmental syndromes are also associated with HH in the neonatal period. In older children and adult's insulinoma, non-insulinoma pancreatogenous hypoglycemia syndrome and post bariatric surgery are recognized causes of HH. This review article will focus mainly on describing the molecular mechanisms that lead to unregulated insulin secretion.
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Affiliation(s)
- Azizun Nessa
- Genetics and Genomic Medicine Programme, Department of Paediatric Endocrinology, UCL Institute of Child Health, Great Ormond Street Hospital for Children NHS, London, UK
| | - Sofia A. Rahman
- Genetics and Genomic Medicine Programme, Department of Paediatric Endocrinology, UCL Institute of Child Health, Great Ormond Street Hospital for Children NHS, London, UK
| | - Khalid Hussain
- Genetics and Genomic Medicine Programme, Department of Paediatric Endocrinology, UCL Institute of Child Health, Great Ormond Street Hospital for Children NHS, London, UK
- *Correspondence: Khalid Hussain,
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Cohen RD, Brown CL, Nickols C, Levey P, Boucher BJ, Greenwald SE, Wang W. Inbuilt mechanisms for overcoming functional problems inherent in hepatic microlobular structure. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2011; 2011:185845. [PMID: 21547084 PMCID: PMC3085299 DOI: 10.1155/2011/185845] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2010] [Accepted: 01/26/2011] [Indexed: 11/17/2022]
Abstract
The spherical anatomy of human and rat liver lobules implies that more central cells have less time to carry out their function than more peripherally located cells because blood flows past them more rapidly. This problem could be overcome if more centrilobular cells could operate at higher temperatures than periportal cells. This study presents evidence for such a temperature gradient. Firstly, we use mathematical modelling to demonstrate that temperature increases towards the centre of the lobule. Secondly, we examine the distribution of a heat-generating protein and of a heat-sensitive protein across the rat and human liver lobules. Double-antibody staining of healthy liver from rat and human was used for visual scoring and for automated histomorphometric quantitation of the localisation of uncoupling protein-2 (known to generate heat) and of the transient receptor potential-v4 protein (known as a highly temperature-sensitive membrane protein). Both these proteins were found to be located predominantly in the centrilobular region of liver lobules. These findings support the suggestion that temperature gradients across the liver lobule may have evolved as a solution to the problem of reduced contact time between blood and cells at the centre as compared to the periphery of mammalian liver lobules.
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Affiliation(s)
- Robert D. Cohen
- Centre for Diabetes, Bart's and The London School of Medicine and Dentistry, Blizard Institute for Cell and Molecular Sciences, Queen Mary University of London, Newark Street, London E1 2AT, UK
| | - Christopher L. Brown
- Department of Cellular Pathology, Bart's and The London NHS Trust, 80 Newark Street, London E1 2AT, UK
| | - Carole Nickols
- Department of Cellular Pathology, Bart's and The London NHS Trust, 80 Newark Street, London E1 2AT, UK
| | - Pauline Levey
- Department of Cellular Pathology, Bart's and The London NHS Trust, 80 Newark Street, London E1 2AT, UK
| | - Barbara J. Boucher
- Centre for Diabetes, Bart's and The London School of Medicine and Dentistry, Blizard Institute for Cell and Molecular Sciences, Queen Mary University of London, Newark Street, London E1 2AT, UK
| | - Stephen E. Greenwald
- Department of Cellular Pathology, Bart's and The London NHS Trust, 80 Newark Street, London E1 2AT, UK
| | - Wen Wang
- Medical Engineering Division, The School of Engineering and Materials Science, Queen Mary University of London, Mile End, London E1 4NS, UK
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Jiang Y, Zhang H, Dong LY, Wang D, An W. Increased hepatic UCP2 expression in rats with nonalcoholic steatohepatitis is associated with upregulation of Sp1 binding to its motif within the proximal promoter region. J Cell Biochem 2008; 105:277-89. [PMID: 18543254 DOI: 10.1002/jcb.21827] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Uncoupling protein-2 (UCP2) is a mitochondrial inner-membrane carrier protein that is involved in the control of fatty acid metabolism. To understand the mechanism of the transcriptional regulation of ucp2 in the pathogenesis of nonalcoholic steatohepatitis (NASH), we cloned 500 bp upstream of the ucp2 exon 1 from a rat liver cDNA library and identified cis-acting regulatory elements. The transcriptional start site was identified as "C," -359 bp from the ATG codon. A reporter gene assay showed that deletion of the nucleotide sequence between -264 and -60 bp resulted in a significant decrease in promoter activity in HepG2 and H4IIE cells. Electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP) revealed that the increase in promoter activity is related to an enhanced ability of Sp1 to bind to its motifs at -84 to -61 bp within the ucp2 proximal promoter. Overexpression of exogenous Sp1 in H4IIE cells also increased the promoter activity. We demonstrated that the expression of UCP2 mRNA and protein is markedly increased in rats with nonalcoholic steatohepatitis (NASH). Coincidently, levels of Sp1 binding to -84/-61 bp were also increased. Overall, our data indicate that the Sp1-binding site located at the proximal promoter is involved in the regulation of rat UCP2 expression.
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Affiliation(s)
- Ying Jiang
- Department of Cell Biology and Municipal Laboratory for Liver Protection and Regulation of Regeneration, Capital Medical University, 100069 Beijing, China
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Yu X, Jacobs DR, Schreiner PJ, Gross MD, Steffes MW, Fornage M. The uncoupling protein 2 Ala55Val polymorphism is associated with diabetes mellitus: the CARDIA study. Clin Chem 2005; 51:1451-6. [PMID: 15951317 DOI: 10.1373/clinchem.2004.044859] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Uncoupling proteins (UCPs) reduce ATP generation with concomitant increased release of heat. The activities of UCPs have been related to obesity and energy metabolism. METHODS We investigated the association of the commonly observed UCP2 Ala55Val (V) polymorphism with diabetes mellitus and impaired fasting glucose (IFG) among 3684 participants in the Coronary Artery Risk Development in Young Adults (CARDIA) study. RESULTS The V frequency was approximately 45% in blacks and 42% in whites. Those with the Val/Val (VV) genotype had a higher incidence of diabetes than those having the Ala/Ala (AA) genotype (5.8% vs 3.3%; P = 0.02). Similarly, the incidences of diabetes in participants without abdominal obesity were 2.8% and 1.0% (P = 0.03) in the VV and AA groups, and 12.4% and 8.3% (P = 0.15) in participants with abdominal obesity. The incidence of IFG was higher in VV vs AA only in those without abdominal obesity (12.9% vs 9.2%). These trends persisted in minimally and fully adjusted models, and in strata of blacks and whites and men and women. The homeostasis model assessment for insulin resistance was highest in VV in the combined group of those with IFG or untreated diabetes, but not in those with normal fasting glucose. CONCLUSION The VV genotype of the UCP2 polymorphism was positively related to diabetes. It may involve increased insulin resistance in those with impaired glucose homeostasis.
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Affiliation(s)
- Xinhua Yu
- Division of Epidemiology, School of Public Health, University of Minnesota, Minneapolis, MN 55454, USA
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Maestrini S, Podestà F, Di Blasio AM, Savia G, Brunani A, Tagliaferri A, Mencarelli M, Chiodini I, Liuzzi A. Lack of association between UCP2 gene polymorphisms and obesity phenotype in Italian Caucasians. J Endocrinol Invest 2003; 26:985-90. [PMID: 14759071 DOI: 10.1007/bf03348196] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The importance of the genetic component on adipose tissue accumulation has been clearly demonstrated. Among the candidate genes investigated, there are those that regulate thermogenesis and, thus, can affect energy expenditure. The uncoupling proteins (UCPs) are a family of proteins that uncouple respiration leading to generation of heat and increased energy expenditure. Contradictory data indicate that allelic variants in their coding genes might be associated with obesity. In this study we evaluated the role of two allelic variants of the UCP2 gene in obesity and the association with its sub-phenotypic characteristics. To this aim, 360 morbidly obese patients [age: 45 +/- 15 yr, body mass index (BMI): 46 +/- 7 kg/m2] and 103 normal weight subjects (BMI < 24 kg/m2) were genotyped for the 45 bais-pair (bp) insertion/deletion (I/D) in the 3'-untraslated region of exon 8 of the UCP2 gene while the presence of an Ala/Val substitution at codon 55 (Ala55Val) of the same gene was studied in 104 obese and 50 lean subjects. Patients also underwent a study protocol including measurements of BMI, waist-to-hip ratio (WHR), resting energy expenditure (REE), energy intake, fat mass (FM) and free fat mass (FFM), total cholesterol (TCH), high density lipoprotein (HDL) cholesterol, triacylglyceroles (TG), leptin levels, basal glucose, immunoreactive insulin (IRI), glycated haemoglobin (HbA1c), insulin sensitivity and thyroid hormones. No significant association between the two polymorphisms studied and the clinical, metabolic and anthropometric parameters characteristic of the obese phenotype was found. These results, in accordance with similar findings previously obtained in other ethnic groups, suggest that these two UCP2 allelic variants may not have a direct role in the pathogenesis and development of obesity.
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Affiliation(s)
- S Maestrini
- Molecular Biology Laboratory, San Giuseppe Hospital, Italian Auxologic Institute, Verbania, Italy
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Affiliation(s)
- P Collins
- Diabetes and Endocrinology Research Group, University Clinical Departments, University Hospital Aintree, Liverpool, UK
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Yanovski JA, Diament AL, Sovik KN, Nguyen TT, Li H, Sebring NG, Warden CH. Associations between uncoupling protein 2, body composition, and resting energy expenditure in lean and obese African American, white, and Asian children. Am J Clin Nutr 2000; 71:1405-20. [PMID: 10837279 PMCID: PMC4495659 DOI: 10.1093/ajcn/71.6.1405] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Little is known about genes that affect childhood body weight. OBJECTIVE The objective of this study was to examine the association between alleles of the mitochondrial uncoupling protein 2 (UCP2) gene and obesity because UCP2 may influence energy expenditure. DESIGN We related UCP2 genotype to body composition and resting energy expenditure in 105 children aged 6-10 y. Overweight children and nonoverweight children of overweight parents were genotyped for a 45-base pair deletion/insertion (del/ins) in 3'-untranslated region of exon 8 and for an exon 4 C to T transition. RESULTS Eighty-nine children were genotyped for the exon 8 allele: 50 children had del/del, 33 had del/ins, and 6 had ins/ins. Mean (+/-SD) body mass index (BMI; in kg/m(2)) was greater for children with del/ins (24.1 +/- 5.9) than for children with del/del (20.4 +/- 4.8; P < 0.001). BMI of ins/ins children (23.7 +/- 7.8) was not significantly different from that of del/ins children. A greater BMI in del/ins children was independent of race and sex. Body composition was also different according to UCP2 genotype. All body circumferences and skinfold thicknesses examined were significantly greater in del/ins than in del/del children. Body fat mass as determined by dual-energy X-ray absorptiometry was also greater in del/ins than in del/del children (P < 0.005). For 104 children genotyped at exon 4, no significant differences in BMI or body composition were found among the 3 exon 4 genotypes. Neither resting energy expenditure nor respiratory quotient were different according to UCP2 exon 4 or exon 8 genotype. CONCLUSIONS The exon 8 ins/del polymorphism of UCP2 appears to be associated with childhood-onset obesity. The UCP2/UCP3 genetic locus may play a role in childhood body weight.
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Affiliation(s)
- J A Yanovski
- Unit on Growth and Obesity, Developmental Endocrinology Branch, National Institute of Child Health and Human Development, NIH, Bethesda, MD 20892-1862, USA.
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