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da Fonseca ACP, Assis ISDS, Salum KCR, Palhinha L, Abreu GDM, Zembrzuski VM, Campos Junior M, Nogueira-Neto JF, Cambraia A, Souza Junior MLF, Maya-Monteiro CM, Cabello PH, Bozza PT, Carneiro JRI. Genetic variants in DBC1, SIRT1, UCP2 and ADRB2 as potential biomarkers for severe obesity and metabolic complications. Front Genet 2024; 15:1363417. [PMID: 38841722 PMCID: PMC11151296 DOI: 10.3389/fgene.2024.1363417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 05/01/2024] [Indexed: 06/07/2024] Open
Abstract
Introduction Obesity is a multifactorial disease associated with the development of many comorbidities. This disease is associated with several metabolic alterations; however, it has been shown that some individuals with obesity do not exhibit metabolic syndrome. Adipose tissue neutralizes the detrimental effects of circulating fatty acids, ectopic deposition, and inflammation, among others, through its esterification into neutral lipids that are stored in the adipocyte. However, when the adipocyte is overloaded, i.e., its expansion capacity is exceeded, this protection is lost, resulting in fatty acid toxicity with ectopic fat accumulation in peripheral tissues and inflammation. In this line, this study aimed to investigate whether polymorphisms in genes that control adipose tissue fat storage capacity are potential biomarkers for severe obesity susceptibility and also metabolic complications. Methods This study enrolled 305 individuals with severe obesity (cases, BMI≥35 kg/m2) and 196 individuals with normal weight (controls, 18.5≤BMI≤24.9 kg/m2). Demographic, anthropometric, biochemical, and blood pressure variables were collected from the participants. Plasma levels of leptin, resistin, MCP1, and PAI1 were measured by Bio-Plex 200 Multiplexing Analyzer System. Genomic DNA was extracted and variants in DBC1 (rs17060940), SIRT1 (rs7895833 and rs1467568), UCP2 (rs660339), PPARG (rs1801282) and ADRB2 (rs1042713 and rs1042714) genes were genotyped by PCR allelic discrimination using TaqMan® assays. Results Our findings indicated that SIRT1 rs7895833 polymorphism was a risk factor for severe obesity development in the overdominant model. SIRT1 rs1467568 and UCP2 rs660339 were associated with anthropometric traits. SIRT1 rs1467568 G allele was related to lower medians of body adipose index and hip circumference, while the UCP2 rs660339 AA genotype was associate with increased body mass index. Additionally, DBC1 rs17060940 influenced glycated hemoglobin. Regarding metabolic alterations, 27% of individuals with obesity presented balanced metabolic status in our cohort. Furthermore, SIRT1 rs1467568 AG genotype increased 2.5 times the risk of developing metabolic alterations. No statistically significant results were observed with Peroxisome Proliferator-Activated Receptor Gama and ADRB2 polymorphisms. Discussion/Conclusion This study revealed that SIRT1 rs7895833 and rs1467568 are potential biomarkers for severe obesity susceptibility and the development of unbalanced metabolic status in obesity, respectively. UCP2 rs660339 and DBC1 rs17060940 also showed a significant role in obesity related-traits.
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Affiliation(s)
- Ana Carolina Proença da Fonseca
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Genetics Laboratory, Grande Rio University/AFYA, Rio de Janeiro, Brazil
- Postgraduate Program in Translational Biomedicine, Grande Rio University/AFYA, Rio de Janeiro, Brazil
| | - Izadora Sthephanie da Silva Assis
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Kaio Cezar Rodrigues Salum
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Clementino Fraga Filho University Hospital, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Lohanna Palhinha
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Gabriella de Medeiros Abreu
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Josué de Castro Nutrition Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Mario Campos Junior
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | | | - Amanda Cambraia
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | | | | | - Pedro Hernán Cabello
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Patrícia Torres Bozza
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - João Regis Ivar Carneiro
- Clementino Fraga Filho University Hospital, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Pang S, Zhang Z, Zhou Y, Zhang J, Yan B. Genetic Variants of SIRT1 Gene Promoter in Type 2 Diabetes. Int J Endocrinol 2023; 2023:6919275. [PMID: 36747995 PMCID: PMC9899147 DOI: 10.1155/2023/6919275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 01/05/2023] [Accepted: 01/19/2023] [Indexed: 01/29/2023] Open
Abstract
Type 2 diabetes (T2D) is a highly heterogeneous and polygenic disease. To date, genetic causes and underlying mechanisms for T2D remain unclear. SIRT1, one member of highly conserved NAD-dependent class III deacetylases, has been implicated in many human diseases. Accumulating evidence indicates that SIRT1 is involved in insulin resistance and impaired pancreatic β-cell function, the two hallmarks of T2D. Thus, we speculated that altered SIRT1 levels, resulting from the genetic variants within its regulatory region of SIRT1 gene, may contribute to the T2D development. In this study, the SIRT1 gene promoter was genetically analyzed in T2D patients (n = 218) and healthy controls (n = 358). A total of 20 genetic variants, including 7 single-nucleotide polymorphisms (SNPs), were identified. Five heterozygous genetic variants (g.4114-15InsA, g.4801G > A, g.4816G > C, g.4934G > T, and g.4963_64Ins17bp) and one SNP (g.4198A > C (rs35706870)) were identified in T2D patients, but in none of the controls. The frequencies of two SNPs (g.4540A > G (rs3740051) (OR: 1.75, 95% CI: 1.24-2.47, P < 0.001 in dominant genetic model) and g.4821G > T (rs35995735)) (OR: 3.58, 95% CI: 1.94-6.60, P < 0.001 in dominant genetic model) were significantly higher in T2D patients. Further association and haplotype analyses confirmed that these two SNPs were strongly linked, contributing to the T2D (OR: 1.442, 95% CI: 1.080-1.927, P < 0.05). Moreover, most of the genetic variants identified in T2D were disease-specific. Taken together, the genetic variants within SIRT1 gene promoter might contribute to the T2D development by altering SIRT1 levels. Underlying molecular mechanism needs to be further explored.
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Affiliation(s)
- Shuchao Pang
- Shandong Provincial Sino-US Cooperation Research Center for Translational Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272029, China
| | - Zhengjun Zhang
- Division of Endocrinology, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272029, China
| | - Yu Zhou
- Shandong Provincial Sino-US Cooperation Research Center for Translational Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272029, China
| | - Jie Zhang
- Cardiovascular Center, Beijing Tongren Hospital, Capital Medical University, Dongcheng, Beijing 100730, China
| | - Bo Yan
- Shandong Provincial Sino-US Cooperation Research Center for Translational Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272029, China
- Institute of Precision Medicine, Jining Medical University, Jining, Shandong 272067, China
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Tao TT, Lin XH, Tang SJ, Gui WW, Zhu WF, Li H. Association of genetic variants in the Sirt1 and Nrf2 genes with the risk of metabolic syndrome in a Chinese Han population. BMC Endocr Disord 2022; 22:84. [PMID: 35365152 PMCID: PMC8973505 DOI: 10.1186/s12902-022-00965-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 02/18/2022] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Metabolic syndrome (MetS) is a complex of interrelated risk factors, including central adiposity, increased blood pressure, hyperglycemia, elevated triglyceride levels and low high-density lipoprotein. Few studies have reported the genetic variants in the Sirt1 and Nrf2 genes (Sirt1 rs7895833 A > G, Sirt1 rs2273773 C > T and Nrf2 rs6721961 C > A) that increase the risk of type 2 diabetes mellitus and are correlated with some glycemic and metabolic traits in the Chinese Han population. METHODS Our study recruited 141 individuals with MetS and 549 individuals without MetS to investigate the associations between three single nucleotide polymorphisms (SNPs) of Sirt1 and Nrf2 and the risk of MetS in a Chinese Han population using the PCR-CTPP method. RESULTS This research showed that the risk of MetS was 2.41 times higher for the AA genotype (P = 0.038) and 1.94 times higher for the AG genotype (P = 0.016) compared with carriers of the GG genotype. The serum levels of low-density lipoprotein cholesterol and HOMA-IR were significantly higher (P < 0.05) in carriers of the AA genotype of Sirt1 rs7895833 than in carriers of the AG and GG genotypes in the general population. The serum level of total cholesterol in the AA genotype was lower (P = 0.033) than that in the other two genotypes. However, the genotype frequencies of Sirt1 rs2273773 and Nrf2 rs6721961 in the MetS group were not significantly different from those in the control subjects, and those two genetic variants were not correlated with metabolic traits. CONCLUSIONS These results underscore the contributions of SNPs of Sirt1 rs7895833 to MetS susceptibility as well as glycemic and metabolic traits in a Chinese population.
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Affiliation(s)
- T T Tao
- Department of Endocrinology, School of Medicine, Sir Run Run Shaw Hospital, Zhejiang University, 7th Floor, Tower I, 3 East Qingchun Road, Hangzhou, 571, ZJ, China
| | - X H Lin
- Department of Endocrinology, School of Medicine, Sir Run Run Shaw Hospital, Zhejiang University, 7th Floor, Tower I, 3 East Qingchun Road, Hangzhou, 571, ZJ, China
| | - S J Tang
- Department of Endocrinology, School of Medicine, Sir Run Run Shaw Hospital, Zhejiang University, 7th Floor, Tower I, 3 East Qingchun Road, Hangzhou, 571, ZJ, China
| | - W W Gui
- Department of Endocrinology, School of Medicine, Sir Run Run Shaw Hospital, Zhejiang University, 7th Floor, Tower I, 3 East Qingchun Road, Hangzhou, 571, ZJ, China
| | - W F Zhu
- Department of Endocrinology, School of Medicine, Sir Run Run Shaw Hospital, Zhejiang University, 7th Floor, Tower I, 3 East Qingchun Road, Hangzhou, 571, ZJ, China
| | - H Li
- Department of Endocrinology, School of Medicine, Sir Run Run Shaw Hospital, Zhejiang University, 7th Floor, Tower I, 3 East Qingchun Road, Hangzhou, 571, ZJ, China.
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Alam F, Syed H, Amjad S, Baig M, Khan TA, Rehman R. Interplay between oxidative stress, SIRT1, reproductive and metabolic functions. Curr Res Physiol 2021; 4:119-124. [PMID: 34746831 PMCID: PMC8562188 DOI: 10.1016/j.crphys.2021.03.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 03/08/2021] [Accepted: 03/17/2021] [Indexed: 01/05/2023] Open
Abstract
Silent information Regulators (SIRT1) gene stimulates antioxidants' expression, repairs cells damaged by oxidative stress (OS), and prevents the cells' dysfunction. In particular, the role of different Sirtuins, particularly SIRT1 in reproduction, has been widely studied over the past decade. Decreased SIRT 1 causes mitochondrial dysfunction by increasing Reactive Oxygen Species (ROS), lipid peroxidation, and DNA damage in both male and female gametes (Sperms and Oocytes), leading to infertility. In the female reproductive system, SIRT1 regulates proliferation and apoptosis in granulosa cells (GCs), and its down-regulation is associated with a reduced ovarian reserve. SIRT1 also modulates the stress response to OS in GCs by targeting a transcription factor vital for ovarian functions and maintenance. ROS-mediated damage to spermatozoa's motility and morphology is responsible for 30-80% of men's infertility cases. High levels of ROS can cause damage to deoxyribo nucleic acid (DNA) in the nucleus and mitochondria, lipid peroxidation, apoptosis, inactivation of enzymes, and oxidation of proteins in spermatozoa. SIRT 1 is a cardioprotective molecule that prevents atherosclerosis by modulating various mechanisms such as endothelial injury due to impaired nitric oxide (NO) production, inflammation, OS, and regulation of autophagy. SIRT 1 is abundantly expressed in tubular cells and podocytes. It is also found to be highly expressed in aquaporin 2 positive cells in the distal nephron suggesting its involvement in sodium and water handling. SIRT1 improves insulin resistance by reducing OS and regulating mitochondrial biogenesis and function. It also decreases adiposity and lipogenesis and increases fatty acid oxidation. So, its involvement in the multiple pathways ensures its unique role in reproductive and metabolic derangement mechanisms.
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Affiliation(s)
- Faiza Alam
- Department of Physiology, University of Karachi, Karachi, Pakistan.,PAPRSB Institute of Health Scienecs, Universiti Brunei Darussalam, Bandar Seri Begawan, Brunei
| | - Hareem Syed
- Department of Cardiology, Tabba Heart Institute, Karachi, Pakistan
| | - Sofia Amjad
- Department of Physiology, Ziauddin University, Karachi, Pakistan
| | - Mukhtiar Baig
- Department of Clinical Biochemistry, Faculty of Medicine, Rabigh, King Abdulaziz University, Jeddah, Saudi Arabia
| | | | - Rehana Rehman
- Department of Biological and Biomedical Sciences, Aga Khan University, Karachi, Pakistan
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Premature Myocardial Infarction: Genetic Variations in SIRT1 Affect Disease Susceptibility. Cardiol Res Pract 2019; 2019:8921806. [PMID: 31143479 PMCID: PMC6501229 DOI: 10.1155/2019/8921806] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 02/13/2019] [Indexed: 11/18/2022] Open
Abstract
Objectives Premature myocardial infarction (PMI) is an uncommon disease, and its incidence varies between 2% and 10%, rising, depending on genetic susceptibility under the influence of lifestyle. The purpose of this study was to investigate the association between SIRT1 single nucleotide polymorphisms (SNPs), SIRT1, and eNOS (endothelial nitric oxide synthase) protein expressions, total antioxidant status (TAS), total oxidant status (TOS), and oxidative stress index (OSI) in young patients with premature ST-elevation myocardial infarction (STEMI). Methods Genotyping of the three single-nucleotide polymorphisms (rs7895833 A > G in the promoter region, rs7069102 C > G in intron 4, and rs2273773 C > T in exon 5) in SIRT1 gene was performed in 108 consecutive patients (87.0% were men with a mean age of 40.74 ± 3.82 years) suffering from ST-elevation myocardial infarction at the age of ≤45 and 91 control subjects. Results The risk for myocardial infarction was increased by 2.31 times in carriers of CC or CG genotypes. SIRT1 protein levels were enhanced and endothelial nitric oxide synthase levels were diminished in ST-elevation myocardial infarction patients regardless of the underlying gene variant. There was no correlation between SIRT1 expression and the amount of endothelial nitric oxide synthase, total antioxidant status, total oxidant status, and oxidative stress index levels in patients and in the control group either. Conclusions SIRT1 single-nucleotide polymorphisms were associated with premature myocardial infarction, which affected the SIRT1 and endothelial nitric oxide synthase protein expression, irrespective of the underlying SIRT1 genotype.
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Hoda AI, Soha SZ, Manal ME, Mohamed RE, Samia AEE. New insight on premature atherosclerosis in Egyptian children with -thalassemia major. AFRICAN JOURNAL OF BIOCHEMISTRY RESEARCH 2018; 12:86-93. [DOI: 10.5897/ajbr2018.1005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Zlatohlavek L, Maratka V, Tumova E, Ceska R, Lanska V, Vrablik M, Hubacek JA. Body Adiposity Changes After Lifestyle Interventions in Children/Adolescents and the NYD-SP18 and TMEM18 Variants. Med Sci Monit 2018; 24:7493-7498. [PMID: 30341978 PMCID: PMC6204654 DOI: 10.12659/msm.907180] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Background This study was carried out to determine the relationship between the common TMEM-18 (rs4854344, G>T) and NYD-SP18 (rs6971091, G>A) gene variants and weight loss after lifestyle interventions (increased physical activity in conjunction with optimal dietary intake) in overweight/obese children/adolescents. Material/Methods We genotyped 684 unrelated, white, non-diabetic children (age 12.7±2.1 years, average BMI at baseline 30.66±4.80 kg/m2). Anthropometric and biochemical examinations were performed before and after 4 weeks of an intensive lifestyle intervention. Results The mean weight loss achieved was 5.20±2.02 kg (P<0.001). NYDSP-18 AA homozygotes had significantly higher abdominal skinfold value before and after the intervention (both, P=0.001). No significant associations between BMI decrease and the NYD-SP18 and TMEM18 variants were found. Associations between all anthropometrical and biochemical changes and genes remained non-significant after data were adjusted for sex, age, and baseline values. Conclusions Decreased body weight in overweight/obese children is not significantly influenced by the NYD-SP18 rs6971091 or TMEM18 rs4854344 polymorphisms.
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Affiliation(s)
- Lukas Zlatohlavek
- 3rd Department of Medicine, 1st Faculty of Medicine of Charles University and General University Hospital in Prague, Prague, Czech Republic
| | - Vit Maratka
- Center for Experimental Medicine, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Eva Tumova
- 3rd Department of Medicine, 1st Faculty of Medicine of Charles University and General University Hospital in Prague, Prague, Czech Republic
| | - Richard Ceska
- 3rd Department of Medicine, 1st Faculty of Medicine of Charles University and General University Hospital in Prague, Prague, Czech Republic
| | - Vera Lanska
- Dr. Filip's Institute for Children, Poděbrady, Czech Republic
| | - Michal Vrablik
- 3rd Department of Medicine, 1st Faculty of Medicine of Charles University and General University Hospital in Prague, Prague, Czech Republic
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Elibol B, Kilic U. High Levels of SIRT1 Expression as a Protective Mechanism Against Disease-Related Conditions. Front Endocrinol (Lausanne) 2018; 9:614. [PMID: 30374331 PMCID: PMC6196295 DOI: 10.3389/fendo.2018.00614] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 09/27/2018] [Indexed: 01/11/2023] Open
Abstract
SIRT1 protein, a member of Silent Information Regulator 2 (Sir2) protein family, have gained considerable attention as epigenetic regulators for a great area in the human physiology. Changes in sirtuin expression are critical in several diseases, including metabolic syndrome, cardiovascular diseases, cancer and neurodegeneration. Here, we provide an overview of the association of the increasing level of SIRT1 protein for regulating some disease related conditions such as obesity, cardiovascular diseases and neurodegeneration. This review also provides a detailed molecular understanding of the interaction of the some basic molecules with increasing SIRT1 levels rather than reduction of the SIRT1 expression. In this context, the current approaches to enhancing the expression of SIRT1 points the importance of epigenetics in several age-related diseases to provide a healthy aging by developing novel therapies which can prevent or damp the progression of some diseases.
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Affiliation(s)
- Birsen Elibol
- Department of Medical Biology, Faculty of Medicine, Bezmialem Vakif University, Istanbul, Turkey
| | - Ulkan Kilic
- Department of Medical Biology, Faculty of Medicine, University of Health Sciences, Istanbul, Turkey
- *Correspondence: Ulkan Kilic
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Association of SIRT1 gene polymorphism and its expression for the risk of alcoholic fatty liver disease in the Han population. Hepatol Int 2017; 12:56-66. [PMID: 29189974 DOI: 10.1007/s12072-017-9836-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 11/09/2017] [Indexed: 12/29/2022]
Abstract
OBJECTIVE To investigate the associations between SIRT1 polymorphisms and their expression in patients with alcoholic fatty liver disease (AFLD). METHODS A total of 268 heavy drinkers were divided into the AFLD group (n = 176) and alcoholic control (n = 92) and 237 light-/non-drinkers into the NAFLD (non-AFLD) group (n = 117) and healthy control (n = 120). The genotyping of SIRT1 (rs33957861, rs11599176, rs12413112 and rs35689145) was detected by the Sequenom MassARRAY iPLEX test. The mRNA and protein expressions of SIRT1 were determined by quantitative real-time polymerase chain reaction (qRT-PCR) and enzyme-linked immunosorbent assays (ELISA), respectively. RESULTS SIRT1 gene rs33957861 and rs11599176 polymorphisms significantly reduce the risk of NAFLD and AFLD, while rs35689145 remarkably increases the risk. Haplotypes of AAAA (rs33957861-rs11599176-rs12413112-rs35689145), AAAA, CAGA and CGAA can appreciably lower the presence of AFLD, but CAAG had an elevated AFLD risk. Besides, in the NAFLD and AFLD groups, a decreased BMI was found in the mutant genotype carriers of rs33957861, rs11599176 and rs12413112, but an increased BMI was observed in the rs35689145 mutant genotype carriers when compared to those with the wild-type homozygous genotype ones. Furthermore, rs33957861 C>T, rs11599176 A>G and BMI were independent risk factors of AFLD. There was no difference among four SNPs of SIRT1 and its mRNA and protein expressions in all groups. CONCLUSION SIRT1 polymorphisms and their expression were associated with the presence of AFLD, and there was a close relationship among four SNPs and BMI in AFLD patients, but no SNP was related to its expression.
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Lee M, Choi S, Lee Y, Oh HH. The Gender Association of the SIRT1 rs7895833 Polymorphism with Pediatric Obesity: A 3-Year Panel Study. JOURNAL OF NUTRIGENETICS AND NUTRIGENOMICS 2017; 9:265-275. [PMID: 28118644 DOI: 10.1159/000454713] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 11/24/2016] [Indexed: 11/19/2022]
Abstract
OBJECTIVES Sirtuin 1 (SIRT1), a longevity-associated gene, has pleiotropic functions. We investigated whether SIRT1 variation is associated with pediatric obesity. METHODS During 3 years of follow-up of 219 children (101 boys, 118 girls) aged 8 or 9 years at baseline, obesity parameters such as anthropometrics, plasma lipid and insulin resistance profiles, and nutrient intakes were analyzed with regard to 3 genotypes of SIRT1 rs7895833 (GG, GA, and AA). RESULTS The prevalence of obesity including overweight had increased from 18.3% (in 2007) to 25.1% (in 2010), and the incidence of obesity over 3 years from nonobesity at the baseline was 11.7%. In the obesity group (BMI >85th percentile) that had been nonobese 3 years before, the frequency of the GA+AA genotypes was higher than that of the GG genotype. Among the total number of subjects, the values for criteria for obesity such as BMI and waist circumference were higher in the GA+AA group than in the GG group. In boys, the reductions in total cholesterol and low-density lipoprotein cholesterol levels in the GG group were considerably greater than those in the GA+AA group, even though the changes in carbohydrate, fat, and protein intake in the GG group were higher than in the GA+AA group. In girls, the reductions in fasting blood sugar and homeostatic model assessment insulin resistance (HOMA-IR) levels were greater in the GA+AA group than in the GG group, despite unchanged energy intakes over 3 years. CONCLUSIONS We identified an association between SIRT1 variation and pediatric obesity in Korean children with a gender difference.
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Affiliation(s)
- Myoungsook Lee
- Department of Food and Nutrition, Sungshin Women's University, Seoul, Republic of Korea
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Kurylowicz A. In Search of New Therapeutic Targets in Obesity Treatment: Sirtuins. Int J Mol Sci 2016; 17:ijms17040572. [PMID: 27104517 PMCID: PMC4849028 DOI: 10.3390/ijms17040572] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Revised: 03/29/2016] [Accepted: 04/06/2016] [Indexed: 12/11/2022] Open
Abstract
Most of the available non-invasive medical therapies for obesity are non-efficient in a long-term evaluation; therefore there is a constant need for new methods of treatment. Research on calorie restriction has led to the discovery of sirtuins (silent information regulators, SIRTs), enzymes regulating different cellular pathways that may constitute potential targets in the treatment of obesity. This review paper presents the role of SIRTs in the regulation of glucose and lipid metabolism as well as in the differentiation of adipocytes. How disturbances of SIRTs’ expression and activity may lead to the development of obesity and related complications is discussed. A special emphasis is placed on polymorphisms in genes encoding SIRTs and their possible association with susceptibility to obesity and metabolic complications, as well as on data regarding altered expression of SIRTs in human obesity. Finally, the therapeutic potential of SIRTs-targeted strategies in the treatment of obesity and related disorders is discussed.
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Affiliation(s)
- Alina Kurylowicz
- Department of Human Epigenetics, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawinskiego Street, 02-106 Warsaw, Poland.
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Owczarczyk AB, Schaller MA, Reed M, Rasky AJ, Lombard DB, Lukacs NW. Sirtuin 1 Regulates Dendritic Cell Activation and Autophagy during Respiratory Syncytial Virus-Induced Immune Responses. THE JOURNAL OF IMMUNOLOGY 2015; 195:1637-46. [PMID: 26157176 DOI: 10.4049/jimmunol.1500326] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Accepted: 06/16/2015] [Indexed: 12/21/2022]
Abstract
Respiratory syncytial virus (RSV) is the major cause of lower respiratory tract infection in children worldwide. Sirtuin 1 (SIRT1), an NAD(+)-dependent deacetylase, has been associated with the induction of autophagy and the regulation of inflammatory mediators. We found that Sirt1 was upregulated in mouse lung after RSV infection. Infected animals that received EX-527, a selective SIRT1 inhibitor, displayed exacerbated lung pathology, with increased mucus production, elevated viral load, and enhanced Th2 cytokine production. Gene expression analysis of isolated cell populations revealed that Sirt1 was most highly upregulated in RSV-treated dendritic cells (DCs). Upon RSV infection, EX-527-treated DCs, Sirt1 small interfering RNA-treated DCs, or DCs from conditional knockout (Sirt1(f/f)-CD11c-Cre(+)) mice showed downregulated inflammatory cytokine gene expression and attenuated autophagy. Finally, RSV infection of Sirt1(f/f)-CD11c-Cre(+) mice resulted in altered lung and lymph node cytokine responses, leading to exacerbated pathology. These data indicate that SIRT1 promotes DC activation associated with autophagy-mediated processes during RSV infection, thereby directing efficient antiviral immune responses.
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Affiliation(s)
- Anna B Owczarczyk
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Matthew A Schaller
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Michelle Reed
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Andrew J Rasky
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - David B Lombard
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109; and Institute of Gerontology, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Nicholas W Lukacs
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109; and
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Gok O, Karaali ZE, Acar L, Kilic U, Ergen A. ABCG5 and ABCG8 gene polymorphisms in type 2 diabetes mellitus in the Turkish population. Can J Diabetes 2015; 39:405-10. [PMID: 26088706 DOI: 10.1016/j.jcjd.2015.04.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 03/23/2015] [Accepted: 04/09/2015] [Indexed: 01/03/2023]
Abstract
OBJECTIVE The aim of the present study was to investigate the relationship between ABCG5 and ABCG8 gene polymorphisms and plasma lipid concentrations in Turkish patients with type 2 diabetes mellitus. METHODS Included in this study were 80 patients with type 2 diabetes and 73 healthy controls. Two selected single nucleotide polymorphisms in ABC transporter genes, ABCG5 (rs6720173) and ABCG8 (rs4148211), were genotyped by using the polymerase chain reaction-restriction fragment length polymorphism technique. RESULTS The rate of having the ABCG8 AA genotype (p=0.001) was significantly higher in the patients than in the control subjects. Correspondingly, the rates of having the AG genotype (p=0.001) and the G allele (p=0.001) were significantly lower in the patients than in controls. Upon comparing the groups regarding ABCG5, the frequencies of occurrence of the GG genotype (p=0.031) and G allele (p=0.003) were considerably higher in patients than in control subjects. In the patients, the rates of having the CC genotype (p=0.003) and the C allele (p=0.031) were also significantly lower than those in control subjects. There was no significant difference between G5 and G8 polymorphism and lipid levels in the study groups. The ABCG8 AA genotype carriers had higher triglyceride (p=0.045) and very low-density-cholesterol (p=0.045) levels than the ABCG8 GG genotype carriers in all study populations. CONCLUSIONS These results indicate that the AA genotype for ABCG8 and the GG genotype and G allele for ABCG5 are risk factors for diabetes. This study reveals the first data concerning the ABCG5 and ABCG8 gene polymorphisms in Turkish patients with diabetes.
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Affiliation(s)
- Ozlem Gok
- Department of Molecular Medicine, Institute for Experimental Medicine, Istanbul University, Istanbul, Turkey; Department of Medical Biology and Regenerative and Restorative Medicine Research Center (REMER), Faculty of Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Zeynep Ermis Karaali
- Department of Internal Medicine, Haseki Training and Research Hospital, Istanbul, Turkey
| | - Leyla Acar
- Department of Molecular Medicine, Institute for Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Ulkan Kilic
- Department of Medical Biology and Regenerative and Restorative Medicine Research Center (REMER), Faculty of Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Arzu Ergen
- Department of Molecular Medicine, Institute for Experimental Medicine, Istanbul University, Istanbul, Turkey.
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Sasaki T. Age-Associated Weight Gain, Leptin, and SIRT1: A Possible Role for Hypothalamic SIRT1 in the Prevention of Weight Gain and Aging through Modulation of Leptin Sensitivity. Front Endocrinol (Lausanne) 2015; 6:109. [PMID: 26236282 PMCID: PMC4504171 DOI: 10.3389/fendo.2015.00109] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Accepted: 07/01/2015] [Indexed: 12/14/2022] Open
Abstract
The hypothalamus is the principal regulator of body weight and energy balance. It modulates both energy intake and energy expenditure by sensing the energy status of the body through neural inputs from the periphery as well as direct humoral inputs. Leptin, an adipokine, is one of the humoral factors responsible for alerting the hypothalamus that enough energy is stored in the periphery. Plasma leptin levels are positively linked to adiposity; leptin suppress energy intake and stimulates energy expenditure. However, prolonged increases in plasma leptin levels due to obesity cause leptin resistance, affecting both leptin access to hypothalamic neurons and leptin signal transduction within hypothalamic neurons. Decreased sensing of peripheral energy status through leptin may lead to a positive energy balance and gradual gains in weight and adiposity, further worsening leptin resistance. Leptin resistance, increased adiposity, and weight gain are all associated with aging in both humans and animals. Central insulin resistance is associated with similar observations. Therefore, improving the action of humoral factors in the hypothalamus may prevent gradual weight gain, especially during middle age. SIRT1 is a NAD(+)-dependent protein deacetylase with numerous substrates, including histones, transcription factors, co-factors, and various enzymes. SIRT1 improves both leptin sensitivity and insulin sensitivity by decreasing the levels of several molecules that impair leptin and insulin signal transduction. SIRT1 and NAD(+) levels decrease with age in the hypothalamus; increased hypothalamic SIRT1 levels prevent age-associated weight gain and improve leptin sensitivity in mice. Therefore, preventing the age-dependent loss of SIRT1 function in the hypothalamus could improve the action of humoral factors in the hypothalamus as well as central regulation of energy balance.
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Affiliation(s)
- Tsutomu Sasaki
- Laboratory for Metabolic Signaling, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
- *Correspondence: Tsutomu Sasaki, Laboratory for Metabolic Signaling, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma 371-8512, Japan,
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