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Alfano R, Robinson O, Handakas E, Nawrot TS, Vineis P, Plusquin M. Perspectives and challenges of epigenetic determinants of childhood obesity: A systematic review. Obes Rev 2022; 23 Suppl 1:e13389. [PMID: 34816569 DOI: 10.1111/obr.13389] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 10/11/2021] [Indexed: 12/20/2022]
Abstract
The tremendous increase in childhood obesity prevalence over the last few decades cannot merely be explained by genetics and evolutionary changes in the genome, implying that gene-environment interactions, such as epigenetic modifications, likely play a major role. This systematic review aims to summarize the evidence of the association between epigenetics and childhood obesity. A literature search was performed via PubMed and Scopus engines using a combination of terms related to epigenetics and pediatric obesity. Articles studying the association between epigenetic mechanisms (including DNA methylation and hydroxymethylation, non-coding RNAs, and chromatin and histones modification) and obesity and/or overweight (or any related anthropometric parameters) in children (0-18 years) were included. The risk of bias was assessed with a modified Newcastle-Ottawa scale for non-randomized studies. One hundred twenty-one studies explored epigenetic changes related to childhood obesity. DNA methylation was the most widely investigated mechanism (N = 101 studies), followed by non-coding RNAs (N = 19 studies) with evidence suggestive of an association with childhood obesity for DNA methylation of specific genes and microRNAs (miRNAs). One study, focusing on histones modification, was identified. Heterogeneity of findings may have hindered more insights into the epigenetic changes related to childhood obesity. Gaps and challenges that future research should face are herein described.
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Affiliation(s)
- Rossella Alfano
- Department of Epidemiology and Biostatistics, The School of Public Health, Imperial College London, London, UK.,Medical Research Council-Health Protection Agency Centre for Environment and Health, Imperial College London, London, UK.,Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Oliver Robinson
- Department of Epidemiology and Biostatistics, The School of Public Health, Imperial College London, London, UK.,Medical Research Council-Health Protection Agency Centre for Environment and Health, Imperial College London, London, UK
| | - Evangelos Handakas
- Department of Epidemiology and Biostatistics, The School of Public Health, Imperial College London, London, UK.,Medical Research Council-Health Protection Agency Centre for Environment and Health, Imperial College London, London, UK
| | - Tim S Nawrot
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Paolo Vineis
- Department of Epidemiology and Biostatistics, The School of Public Health, Imperial College London, London, UK.,Medical Research Council-Health Protection Agency Centre for Environment and Health, Imperial College London, London, UK.,Unit of Molecular and Genetic Epidemiology, Human Genetic Foundation (HuGeF), Turin, Italy
| | - Michelle Plusquin
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
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de Castilhos JK, Campagnolo PDB, de Almeida S, Vitolo MR, Mattevi VS. Impact of maternal dietary counseling in the first year of life on DNA methylation in a cohort of children. Genet Mol Biol 2021; 44:e20200330. [PMID: 34874049 PMCID: PMC8670011 DOI: 10.1590/1678-4685-gmb-2020-0330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 09/28/2021] [Indexed: 01/16/2023] Open
Abstract
Epigenetic modifications established during prenatal and early life, including DNA methylation, have been suggested as potential mediators of the interaction between environmental exposures during the perinatal period and adult metabolic health adverse outcomes, especially cardiometabolic complications and overweight. The effect of a dietary intervention in the first year of life on global methylation levels in leukocyte samples from a cohort of children born between 2001 and 2002 in southern Brazil was examined. Overall methylation measurements were performed using enzyme-linked immunosorbent assays on DNA samples from 237 children at 4 years old. Mean methylation values were higher in the intervention group (mean: 2.20 ± 1.31%) than in the control group (mean: 1.65 ± 1.11%; P = 0.001). It was observed that nutritional counseling in the first year increased breastfeeding duration and stimulated the development of healthier eating habits. Therefore, these factors might have contributed to increase global DNA methylation. The findings of the present study reinforce the notion that performing nutritional interventions in the early stages of life is important and provide further evidence of the interaction between the environment and epigenetic traits.
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Affiliation(s)
| | | | - Silvana de Almeida
- Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil
| | - Márcia Regina Vitolo
- Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil
| | - Vanessa Suñé Mattevi
- Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil
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McLaughlin T, Schnittger I, Nagy A, Zanley E, Xu Y, Song Y, Nieman K, Tremmel JA, Dey D, Boyd J, Sacks H. Relationship Between Coronary Atheroma, Epicardial Adipose Tissue Inflammation, and Adipocyte Differentiation Across the Human Myocardial Bridge. J Am Heart Assoc 2021; 10:e021003. [PMID: 34726081 PMCID: PMC8751937 DOI: 10.1161/jaha.121.021003] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Background Inflammation in epicardial adipose tissue (EAT) may contribute to coronary atherosclerosis. Myocardial bridge is a congenital anomaly in which the left anterior descending coronary artery takes a "tunneled" course under a bridge of myocardium: while atherosclerosis develops in the proximal left anterior descending coronary artery, the bridged portion is spared, highlighting the possibility that geographic separation from inflamed EAT is protective. We tested the hypothesis that inflammation in EAT was related to atherosclerosis by comparing EAT from proximal and bridge depots in individuals with myocardial bridge and varying degrees of atherosclerotic plaque. Methods and Results Maximal plaque burden was quantified by intravascular ultrasound, and inflammation was quantified by pericoronary EAT signal attenuation (pericoronary adipose tissue attenuation) from cardiac computed tomography scans. EAT overlying the proximal left anterior descending coronary artery and myocardial bridge was harvested for measurement of mRNA and microRNA (miRNA) using custom chips by Nanostring; inflammatory cytokines were measured in tissue culture supernatants. Pericoronary adipose tissue attenuation was increased, indicating inflammation, in proximal versus bridge EAT, in proportion to atherosclerotic plaque. Individuals with moderate-high versus low plaque burden exhibited greater expression of inflammation and hypoxia genes, and lower expression of adipogenesis genes. Comparison of gene expression in proximal versus bridge depots revealed differences only in participants with moderate-high plaque: inflammation was higher in proximal and adipogenesis lower in bridge EAT. Secreted inflammatory cytokines tended to be higher in proximal EAT. Hypoxia-inducible factor 1a was highly associated with inflammatory gene expression. Seven miRNAs were differentially expressed by depot: 3192-5P, 518D-3P, and 532-5P were upregulated in proximal EAT, whereas miR 630, 575, 16-5P, and 320E were upregulated in bridge EAT. miR 630 correlated directly with plaque burden and inversely with adipogenesis genes. miR 3192-5P, 518D-3P, and 532-5P correlated inversely with hypoxia/oxidative stress, peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PCG1a), adipogenesis, and angiogenesis genes. Conclusions Inflammation is specifically elevated in EAT overlying atherosclerotic plaque, suggesting that EAT inflammation is caused by atherogenic molecular signals, including hypoxia-inducible factor 1a and/or miRNAs in an "inside-to-out" relationship. Adipogenesis was suppressed in the bridge EAT, but only in the presence of atherosclerotic plaque, supporting cross talk between the vasculature and EAT. miR 630 in EAT, expressed differentially according to burden of atherosclerotic plaque, and 3 other miRNAs appear to inhibit key genes related to adipogenesis, angiogenesis, hypoxia/oxidative stress, and thermogenesis in EAT, highlighting a role for miRNA in mediating cross talk between the coronary vasculature and EAT.
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Affiliation(s)
- Tracey McLaughlin
- Division of Endocrinology Stanford University School of Medicine Stanford CA
| | - Ingela Schnittger
- Division of Cardiovascular Medicine Stanford University School of Medicine Stanford CA
| | - Anna Nagy
- Division of Endocrinology Stanford University School of Medicine Stanford CA
| | - Elizabeth Zanley
- Division of Endocrinology Stanford University School of Medicine Stanford CA
| | - Yue Xu
- Division of Endocrinology Stanford University School of Medicine Stanford CA
| | - Yanqiu Song
- Cardiovascular Institute Tianjin Chest Hospital Tianjin China
| | - Koen Nieman
- Division of Cardiovascular Medicine Stanford University School of Medicine Stanford CA
| | - Jennifer A Tremmel
- Division of Cardiovascular Medicine Stanford University School of Medicine Stanford CA
| | - Damini Dey
- Department of Biomedical Sciences and Medicine Cedars-Sinai Medical Center Biomedical Imaging Research Institute Los Angeles CA
| | - Jack Boyd
- Department of Cardiothoracic Surgery Stanford University School of Medicine Stanford CA
| | - Harold Sacks
- Division of Endocrinology Department of Medicine David Geffen School of Medicine at UCLA Los Angeles CA
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Małodobra-Mazur M, Cierzniak A, Kaliszewski K, Dobosz T. PPARG Hypermethylation as the First Epigenetic Modification in Newly Onset Insulin Resistance in Human Adipocytes. Genes (Basel) 2021; 12:889. [PMID: 34207541 PMCID: PMC8228025 DOI: 10.3390/genes12060889] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/20/2021] [Accepted: 06/04/2021] [Indexed: 12/14/2022] Open
Abstract
Insulin acts by binding with a specific receptor called an insulin receptor (INSR), ending up with glucose transporter activation and glucose uptake. Insulin resistance (IR) is a state when the physiological amount of insulin is not sufficient to evoke proper action, i.e., glucose uptake. Epigenetic modifications associated with obesity and IR are some of the main mechanisms leading to IR pathogenesis. The mesenchymal stem cells of adipose tissue (subcutaneous (SAT) and visceral (VAT)) were collected during abdominal surgery. IR was induced ex vivo by palmitic acid. DNA methylation was determined at a global and site-specific level. We found higher global DNA methylation in IR adipocytes after 72 h following IR induction. Furthermore, numerous genes regulating insulin action (PPARG, SLC2A4, ADIPOQ) were hypermethylated in IR adipocytes; the earliest changes in site-specific DNA methylation have been detected for PPARG. Epigenetic changes appear to be mediated through DNMT1. DNA methylation is an important component of IR pathogenesis; the PPARG and its epigenetic modification appear to be the very first epigenetic modification in newly onset IR and are probably of the greatest importance.
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Affiliation(s)
- Małgorzata Małodobra-Mazur
- Department of Forensic Medicine, Wroclaw Medical University, Sklodowskiej-Curie 52, 50-369 Wroclaw, Poland; (A.C.); (T.D.)
- Department of Molecular Techniques, Wroclaw Medical University, Sklodowskiej-Curie 52, 50-369 Wroclaw, Poland
| | - Aneta Cierzniak
- Department of Forensic Medicine, Wroclaw Medical University, Sklodowskiej-Curie 52, 50-369 Wroclaw, Poland; (A.C.); (T.D.)
- Department of Molecular Techniques, Wroclaw Medical University, Sklodowskiej-Curie 52, 50-369 Wroclaw, Poland
| | - Krzysztof Kaliszewski
- Department of General, Minimally Invasive and Endocrine Surgery, Wroclaw Medical University, Borowska 213, 50-556 Wroclaw, Poland;
| | - Tadeusz Dobosz
- Department of Forensic Medicine, Wroclaw Medical University, Sklodowskiej-Curie 52, 50-369 Wroclaw, Poland; (A.C.); (T.D.)
- Department of Molecular Techniques, Wroclaw Medical University, Sklodowskiej-Curie 52, 50-369 Wroclaw, Poland
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Chiu KC, Sisca F, Ying JH, Tsai WJ, Hsieh WS, Chen PC, Liu CY. Prenatal chlorpyrifos exposure in association with PPARγ H3K4me3 and DNA methylation levels and child development. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 274:116511. [PMID: 33540251 DOI: 10.1016/j.envpol.2021.116511] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 12/15/2020] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Chlorpyrifos, one of the most widely used pesticides, can penetrate the placenta and affect fetal growth and neurodevelopment. Epigenetic regulation of peroxisome proliferator-activated receptor gamma (PPARγ), such as DNA methylation and trimethylation of lysine 4 of H3 (H3K4me3), may provide a potential mechanism for how fetal growth and development are impacted by chlorpyrifos exposure. The aims of the study were to investigate whether prenatal chlorpyrifos exposure was associated with H3K4me3 and DNA methylation levels of the PPARγ gene in the placenta and the related effects on birth outcomes and neurodevelopment. METHODS Among 425 mother-infant pairs from the Taiwan Birth Panel Study, chlorpyrifos levels were measured in cord blood by using online SPE-LC/HESI/MS/MS; placental PPARγ H3K4me3 and DNA methylation levels were measured by ChIP-qPCR and pyrosequencing, respectively; the neonates' health outcomes were extracted from the medical records; and childhood neurodevelopment was evaluated by using the Comprehensive Developmental Inventory for Infants and Toddlers in 2-year-old children. Multivariable regression models were used to adjust for potential confounders. RESULTS After controlling for potential confounders, each unit increase in the natural log-transformed prenatal chlorpyrifos exposure level was associated with an increase in the PPARγ DNA methylation level (adjusted β (aβ) = 0.77, p = 0.032) and poorer performance in the cognitive and language domains at 2 years old, especially in boys (aβ = -1.66, p = 0.016, and aβ = -1.79, p = 0.023, respectively). PPARγ H3K4me3 levels were positively associated with gestational age (aβ = 0.16, p = 0.011), birth weight (aβ = 30.52, p = 0.013), birth length (aβ = 0.18, p = 0.003 and aβ = 0.15, p = 0.042), and gross-motor performance (aβ = 1.67, p = 0.036). CONCLUSIONS Our findings suggested that prenatal chlorpyrifos exposure affected PPARγ DNA methylation levels and performance in the cognitive and language domains.
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Affiliation(s)
- Kuan-Chih Chiu
- Institute of Environmental and Occupational Health Sciences, College of Public Health, National Taiwan University, Taipei, 100, Taiwan
| | - Fran Sisca
- Institute of Environmental and Occupational Health Sciences, College of Public Health, National Taiwan University, Taipei, 100, Taiwan
| | - Jen-Hao Ying
- Institute of Environmental and Occupational Health Sciences, College of Public Health, National Taiwan University, Taipei, 100, Taiwan
| | - Wan-Ju Tsai
- Institute of Environmental and Occupational Health Sciences, College of Public Health, National Taiwan University, Taipei, 100, Taiwan
| | - Wu-Shiun Hsieh
- Department of Pediatrics, National Taiwan University College of Medicine and Hospital, Taipei, 100, Taiwan; Department of Pediatrics, Cathay General Hospital, Taipei, 100, Taiwan
| | - Pau-Chung Chen
- Institute of Environmental and Occupational Health Sciences, College of Public Health, National Taiwan University, Taipei, 100, Taiwan; Department of Public Health, National Taiwan University College of Public Health, Taipei, 100, Taiwan; Department of Environmental and Occupational Medicine, National,Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, 100, Taiwan; National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, 350, Taiwan
| | - Chen-Yu Liu
- Institute of Environmental and Occupational Health Sciences, College of Public Health, National Taiwan University, Taipei, 100, Taiwan; Department of Public Health, National Taiwan University College of Public Health, Taipei, 100, Taiwan.
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M Dave K, Kaur L, Randhir KN, Mehendale SS, Sundrani DP, Chandak GR, Joshi SR. Placental growth factor and Fms related tyrosine kinase-1 are hypomethylated in preeclampsia placentae. Epigenomics 2021; 13:257-269. [PMID: 33471580 DOI: 10.2217/epi-2020-0318] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Aim: This study aims to examine the DNA methylation (DNAm) and expression patterns of genes associated with placental angiogenesis in preeclampsia. Materials & methods: DNAm and expression were examined in normotensive (n = 100) and preeclampsia (n = 100) women using pyrosequencing and quantitative real-time PCR respectively. Results: Hypomethylation at several CpGs was observed in PlGF and FLT-1 in women with preeclampsia compared to normotensive controls. PlGF expression was lower in women with preeclampsia while FLT-1 expression was comparable. DNAm at various CpGs was negatively correlated with expression in both the genes and were associated with maternal blood pressure and birth outcomes. Conclusion: DNAm and expression of angiogenic factors in placentae are differentially regulated in preeclampsia and influence birth outcomes.
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Affiliation(s)
- Kinjal M Dave
- Mother & Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to be) University, Pune 411043, India
| | - Lovejeet Kaur
- Genomic Research on Complex diseases (GRC Group), Council of Scientific and Industrial Research Centre for Cellular & Molecular Biology (CSIR-CCMB), Hyderabad 500007, India
| | - Karuna N Randhir
- Mother & Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to be) University, Pune 411043, India
| | - Savita S Mehendale
- Department of Gynecology & Obstetrics, Bharati Vidyapeeth Medical College & Hospital, Pune 411043, India
| | - Deepali P Sundrani
- Mother & Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to be) University, Pune 411043, India
| | - Giriraj R Chandak
- Genomic Research on Complex diseases (GRC Group), Council of Scientific and Industrial Research Centre for Cellular & Molecular Biology (CSIR-CCMB), Hyderabad 500007, India
| | - Sadhana R Joshi
- Mother & Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to be) University, Pune 411043, India
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Prenatal stress and epigenetics. Neurosci Biobehav Rev 2020; 117:198-210. [DOI: 10.1016/j.neubiorev.2017.05.016] [Citation(s) in RCA: 96] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 05/15/2017] [Accepted: 05/16/2017] [Indexed: 12/22/2022]
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Pinhel MAS, Noronha NY, Nicoletti CF, Pereira VAB, de Oliveira BAP, Cortes-Oliveira C, Salgado W, Barbosa F, Marchini JS, Souza DRS, Nonino CB. Changes in DNA Methylation and Gene Expression of Insulin and Obesity-Related Gene PIK3R1 after Roux-en-Y Gastric Bypass. Int J Mol Sci 2020; 21:E4476. [PMID: 32599690 PMCID: PMC7352760 DOI: 10.3390/ijms21124476] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 02/18/2020] [Accepted: 02/24/2020] [Indexed: 11/18/2022] Open
Abstract
Weight regulation and the magnitude of weight loss after a Roux-en-Y gastric bypass (RYGB) can be genetically determined. DNA methylation patterns and the expression of some genes can be altered after weight loss interventions, including RYGB. The present study aimed to evaluate how the gene expression and DNA methylation of PIK3R1, an obesity and insulin-related gene, change after RYGB. Blood samples were obtained from 13 women (35.9 ± 9.2 years) with severe obesity before and six months after surgical procedure. Whole blood transcriptome and epigenomic patterns were assessed by microarray-based, genome-wide technologies. A total of 1966 differentially expressed genes were identified in the pre- and postoperative periods of RYGB. From these, we observed that genes involved in obesity and insulin pathways were upregulated after surgery. Then, the PIK3R1 gene was selected for further RT-qPCR analysis and cytosine-guanine nucleotide (CpG) sites methylation evaluation. We observed that the PI3KR1 gene was upregulated, and six DNA methylation CpG sites were differently methylated after bariatric surgery. In conclusion, we found that RYGB upregulates genes involved in obesity and insulin pathways.
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Affiliation(s)
- Marcela A S Pinhel
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
- Department of Molecular Biology, São José do Rio Preto Medical School, São José do Rio Preto 15090-000, Brazil;
| | - Natália Y Noronha
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
| | - Carolina F Nicoletti
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
| | - Vanessa AB Pereira
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
| | - Bruno AP de Oliveira
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
| | - Cristiana Cortes-Oliveira
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
| | - Wilson Salgado
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
| | - Fernando Barbosa
- School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto 14040-900, Brazil;
| | - Júlio S Marchini
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
| | - Doroteia RS Souza
- Department of Molecular Biology, São José do Rio Preto Medical School, São José do Rio Preto 15090-000, Brazil;
| | - Carla B Nonino
- Laboratory of Nutrigenomics Studies, Health Science Department, Ribeirão Preto Medical School, Ribeirão Preto 14049-900, Brazil; (M.A.S.P.); (N.Y.N.); (C.F.N.); (V.A.B.P.); (B.A.P.d.O.); (C.C.-O.); (W.S.J.); (J.S.M.)
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Lima RS, Assis Silva Gomes J, Moreira PR. An overview about DNA methylation in childhood obesity: Characteristics of the studies and main findings. J Cell Biochem 2020; 121:3042-3057. [DOI: 10.1002/jcb.29544] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 10/10/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Rafael Silva Lima
- Laboratory of Cell‐Cell Interactions, Department of Morphology, Institute of Biological SciencesFederal University of Minas Gerais Minas Gerais Brazil
| | - Juliana Assis Silva Gomes
- Laboratory of Cell‐Cell Interactions, Department of Morphology, Institute of Biological SciencesFederal University of Minas Gerais Minas Gerais Brazil
| | - Paula Rocha Moreira
- Laboratory of Cell‐Cell Interactions, Department of Morphology, Institute of Biological SciencesFederal University of Minas Gerais Minas Gerais Brazil
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Un Nisa K, Reza MI. Key Relevance of Epigenetic Programming of Adiponectin Gene in Pathogenesis of Metabolic Disorders. Endocr Metab Immune Disord Drug Targets 2020; 20:506-517. [DOI: 10.2174/1871530319666190801142637] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/20/2019] [Accepted: 06/20/2019] [Indexed: 12/20/2022]
Abstract
Background & Objective::
Significant health and social burdens have been created by the
growth of metabolic disorders like type 2 diabetes mellitus (T2DM), atherosclerosis, and non-alcoholic
steatohepatitis, worldwide. The number of the affected population is as yet rising, and it is assessed
that until 2030, 4−5 million individuals will acquire diabetes. A blend of environmental, genetic, epigenetic,
and other factors, such as diet, are accountable for the initiation and progression of metabolic
disorders. Several researches have shown strong relevance of adiponectin gene and metabolic disorders.
In this review, the potential influence of epigenetic mechanisms of adiponectin gene “ADIPOQ”
on increasing the risk of developing metabolic disorders and their potential in treating this major disorder
are discussed.
Results & Conclusion::
Various studies have postulated that a series of factors such as maternal High
fat diet (HFD), oxidative stress, pro-inflammatory mediators, sleep fragmentation throughout lifetime,
from gestation to old age, could accumulate epigenetic marks, including histone remodeling, DNA
methylation, and microRNAs (miRNAs) that, in turn, alter the expression of ADIPOQ gene and result
in hypoadiponectinemia which precipitates insulin resistance (IR) that in turn might induce or accelerate
the onset and development of metabolic disorder. A better understanding of global patterns of epigenetic
modifications and further their alterations in metabolic disorders will bestow better treatment
strategies design.
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Affiliation(s)
- Kaiser Un Nisa
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education & Research, SAS Nagar, India
| | - Mohammad Irshad Reza
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education & Research, SAS Nagar, India
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Shahin NN, Abd-Elwahab GT, Tawfiq AA, Abdelgawad HM. Potential role of aryl hydrocarbon receptor signaling in childhood obesity. Biochim Biophys Acta Mol Cell Biol Lipids 2020; 1865:158714. [PMID: 32302739 DOI: 10.1016/j.bbalip.2020.158714] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 03/29/2020] [Accepted: 04/10/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND There is a growing concern that junk food has contributed to the childhood obesity epidemic. Recently, experimental studies suggested that the aryl hydrocarbon receptor (AHR) gene is strongly linked to western diet-induced obesity. AIM This study investigated the potential role of AHR signaling in childhood obesity and the possible associations of the AHR-aryl hydrocarbon receptor repressor (AHRR)-cytochrome P450 1B1 (CYP1B1) axis with fatty acid homeostasis and the appetite-related hormones, leptin and ghrelin. SUBJECTS AND METHODS The study included 80 children; 54 obese and 26 non-obese of matched age and sex. Demographic data, anthropometric measurements, and lipid profile were assessed. Expression of AHR signaling genes was analyzed in blood cells by qRT-PCR. Serum insulin, leptin and ghrelin levels were measured using ELISA. RESULTS The statistical power of this study, calculated using G*Power version 3.1.9.2, was 90% (α = 0.05). AHR and CYP1B1 gene expression levels were upregulated in the obese group compared to controls, whereas AHRR, stearoyl-CoA desaturase 1 (SCD1), and peroxisome proliferator-activated receptor-γ2 (PPARγ2) were downregulated. Serum leptin correlated positively, while serum ghrelin correlated negatively with both AHR and CYP1B1. Stratification of obese children by age revealed more activated AHR signaling in younger than in older children. Receiver-operating-characteristic (ROC) analysis revealed that AHR, AHRR and CYP1B1 could discriminate between obese and normal weight children. Multivariate analysis showed that AHRR, CYP1B1 and ghrelin could be significant independent predictors of obesity. CONCLUSION This study provides new insights into the molecular mechanisms contributing to childhood obesity by revealing alterations in the AHR-AHRR-CYP1B1 axis, which could serve as a promising therapeutic target for childhood obesity.
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Affiliation(s)
- Nancy N Shahin
- Department of Biochemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Ghada T Abd-Elwahab
- Department of Biochemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt.
| | | | - Hanan M Abdelgawad
- Department of Biochemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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12
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Lian B, Ren Y, Zhang H, Lin T, Wang Y. An adenosine derivative (IFC-305) reduced the risk of radiation-induced intestinal toxicity in the treatment of colon cancer by suppressing the methylation of PPAR-r promoter. Biomed Pharmacother 2019; 118:109202. [PMID: 31545232 DOI: 10.1016/j.biopha.2019.109202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 06/27/2019] [Accepted: 07/02/2019] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND IFC-305, an adenosine derivative, has been proved to exert a therapeutic effect on radiation-induced intestinal toxicity in colon cancer (CC). The aim of the present study was to investigate the underlying molecular mechanism of protective role of IFC-305 in CC by modifying the methylation of peroxisome proliferator-activated receptor (PPAR)-r promoter. METHOD Peripheral blood and cancerous tissues samples were collected from the CC patients. Irradiation (IR) mice models were established in comparison with control mice accordingly. Bisulfite sequencing, real-time PCR, Western-blot analysis, immunohistochemistry (IHC) and hematoxylin eosin (HE) staining were performed upon both human and animal samples. RESULT The results upon the human CC samples demonstrated that the level of methylation of PPAR-r promoter in methylated patients was increased, while the risk of radiation-induced intestinal toxicity in methylated patients was also increased compared with unmethylated patients. Also, the PPAR-r mRNA/protein expression was lower in methylated patients compared with unmethylated patients, thus indicating the presence of PPAR-r promoter methylation repressed PPAR-r expression in vivo. Moreover, in the mice models, IFC-305 treatment partially alleviated radiation-induced toxicity in the columnar epithelia and tubular glands of IR mice, and villus height and the number/circumference of crypts were also increased while the relative number of inflammatory cells was decreased in IR + IFC-305 mice group compared with the control mice. Compared with the control group, the levels of PPAR-r mRNA/protein expression were significantly decreased in IR mice, while the presence of IFC-305 exerted therapeutic effect upon IR rats via elevating the PPAR-r mRNA/protein expression to a certain extent. CONCLUSION In this study, we demonstrated the relationship between PPAR-r promoter methylation and the risk of radiation-induced intestinal toxicity via studying the clinical samples collected from CC patients. And the study upon mice models suggested that the administration of IFC-305 could alleviate radiation-induced intestinal toxicity through decreasing the methylation of PPAR-r promoter and enhancing the expression of PPAR-r in IR mice.
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Affiliation(s)
- Bo Lian
- Department of Colorectal Surgery, Cancer Hospital of China Medical University, Liaoning Cancer Hospital and Institute, Shenyang 110042, Liaoning Province, People's Republic of China
| | - Yupeng Ren
- Department of Colorectal Surgery, Cancer Hospital of China Medical University, Liaoning Cancer Hospital and Institute, Shenyang 110042, Liaoning Province, People's Republic of China
| | - Hao Zhang
- Department of Colorectal Surgery, Cancer Hospital of China Medical University, Liaoning Cancer Hospital and Institute, Shenyang 110042, Liaoning Province, People's Republic of China.
| | - Tao Lin
- Department of Colorectal Surgery, Cancer Hospital of China Medical University, Liaoning Cancer Hospital and Institute, Shenyang 110042, Liaoning Province, People's Republic of China
| | - Yongpeng Wang
- Department of Colorectal Surgery, Cancer Hospital of China Medical University, Liaoning Cancer Hospital and Institute, Shenyang 110042, Liaoning Province, People's Republic of China
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Nikodemova M, Yee J, Carney PR, Bradfield CA, Malecki KM. Transcriptional differences between smokers and non-smokers and variance by obesity as a risk factor for human sensitivity to environmental exposures. ENVIRONMENT INTERNATIONAL 2018; 113:249-258. [PMID: 29459183 PMCID: PMC5866236 DOI: 10.1016/j.envint.2018.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 02/07/2018] [Accepted: 02/08/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Obesity has been shown to alter response to air pollution and smoking but underlying biological mechanisms are largely unknown and few studies have explored mechanisms by which obesity increases human sensitivity to environmental exposures. OBJECTIVE Overall study goals were to investigate whole blood gene expression in smokers and non-smokers to examine associations between cigarette smoke and changes in gene expression by obesity status and test for effect modification. METHODS Relative fold-change in mRNA expression levels of 84 genes were analyzed using a Toxicity and Stress PCR array among 50 21-54 year old adults. Data on smoking status was confirmed using urinary cotinine levels. Adjusted models included age, gender, white blood cell count and body-mass index. RESULTS Models comparing gene expression of smokers vs. non-smokers identified six differentially expressed genes associated with smoking after adjustments for covariates. Obesity was associated with 29 genes differentially expressed compared to non-obese. We also identified 9 genes with significant smoking/obesity interactions influencing mRNA levels in adjusted models comparing expression between smokers vs non-smokers for four DNA damage related genes (GADD45A, DDB2, RAD51 and P53), two oxidative stress genes (FTH1, TXN), two hypoxia response genes (BN1P3lL, ARNT), and one gene associated with unfolded protein response (ATF6B). CONCLUSIONS Findings suggest that obesity alters human sensitivity to smoke exposures through several biological pathways by modifying gene expression. Additional studies are needed to fully understand the clinical impact of these effects, but risk assessments should consider underlying phenotypes, such as obesity, that may modulate sensitivity of vulnerable populations to environmental exposures.
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Affiliation(s)
- Maria Nikodemova
- Department of Population Health Sciences, School of Medicine and Public Health, University of Wisconsin, Madison, WI, United States
| | - Jeremiah Yee
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin, Madison, WI, United States
| | - Patrick R Carney
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin, Madison, WI, United States
| | - Christopher A Bradfield
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin, Madison, WI, United States
| | - Kristen Mc Malecki
- Department of Population Health Sciences, School of Medicine and Public Health, University of Wisconsin, Madison, WI, United States; The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin, Madison, WI, United States.
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Huang Q, Ma C, Chen L, Luo D, Chen R, Liang F. Mechanistic Insights Into the Interaction Between Transcription Factors and Epigenetic Modifications and the Contribution to the Development of Obesity. Front Endocrinol (Lausanne) 2018; 9:370. [PMID: 30034368 PMCID: PMC6043677 DOI: 10.3389/fendo.2018.00370] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 06/19/2018] [Indexed: 12/12/2022] Open
Abstract
Objective: The development of obesity is inseparable from genetic and epigenetic factors, and transcription factors (TFs) play an essential role in these two mechanisms. This review analyzes the interaction of TFs with epigenetic modifications and the epigenetic mechanisms underlying peroxisome proliferator-activated receptor (PPAR)γ, an important transcription factor, in the development of obesity. Methods: We describe the relationship between TFs and different epigenetic modifications and illustrate the several mechanisms described. Next, we summarize the epigenetic mechanisms of PPARs, an important class of transcription factors involved in obesity, that induce obesity with different triggering factors. Finally, we discuss the mechanisms of epigenetic modification of PPAR-related ligands in lipid metabolism and propose future avenues of research. Results: TFs participate in epigenetic modifications in different forms, causing changes in gene expression. The interactions between the different epigenetic modifications and PPARs are important biological developments that affect fat tissue differentiation, lipogenesis, and lipid metabolism, thereby inducing or inhibiting the development of obesity. We then highlight the need for more research to understand the role of epigenetic modifications and PPARs. Conclusions: Epigenetic mechanisms involved in the regulation of PPARs may be excellent therapeutic targets for obesity treatment. However, there is a need for a deeper understanding of how PPARs and other obesity-related transcription factors interact with epigenetic modifications.
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Affiliation(s)
- Qi Huang
- Department of Acupuncture and Moxibustion, Hubei University of Chinese Medicine, Wuhan, China
| | - Chaoyang Ma
- Department of Rehabilitation, The Central Hospital of Wuhan, Tongji Medical College of Huazhong Science and Technology University, Wuhan, China
| | - Li Chen
- Department of Acupuncture and Moxibustion, Hubei University of Chinese Medicine, Wuhan, China
| | - Dan Luo
- Department of Traditional Chinese Medicine, Huazhong University of Science and Technology Tongji Medical College, Wuhan, China
| | - Rui Chen
- Department of Integrated TCM and Western Medicine, Union Hospital, Tongji Medical College of Huazhong Science and Technology University, Wuhan, China
- *Correspondence: Rui Chen
| | - Fengxia Liang
- Department of Acupuncture and Moxibustion, Hubei University of Chinese Medicine, Wuhan, China
- Fengxia Liang
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15
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Motawi TK, Shaker OG, Ismail MF, Sayed NH. Peroxisome Proliferator-Activated Receptor Gamma in Obesity and Colorectal Cancer: the Role of Epigenetics. Sci Rep 2017; 7:10714. [PMID: 28878369 PMCID: PMC5587696 DOI: 10.1038/s41598-017-11180-6] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 08/14/2017] [Indexed: 12/23/2022] Open
Abstract
Peroxisome proliferator-activated receptor gamma (PPARγ) is a nuclear receptor that is deregulated in obesity. PPARγ exerts diverse antineoplastic effects. Attempting to determine the clinical relevance of the epigenetic mechanisms controlling the expression PPARγ and susceptibility to colorectal cancer (CRC) in obese subjects, this study investigated the role of some microRNAs and DNA methylation on the deregulation of PPARγ. Seventy CRC patients (34 obese and 36 lean), 22 obese and 24 lean healthy controls were included. MicroRNA levels were measured in serum. PPARγ promoter methylation was evaluated in peripheral blood mononuclear cells (PBMC). PPARγ level was evaluated by measuring mRNA level in PBMC and protein level in serum. The tested microRNAs (miR-27b, 130b and 138) were significantly upregulated in obese and CRC patients. Obese and CRC patients had significantly low levels of PPARγ. A significant negative correlation was found between PPARγ levels and the studied microRNAs. There was a significant PPARγ promoter hypermethylation in CRC patients that correlated to low PPARγ levels. Our results suggest that upregulation of microRNAs 27b, 130b and 138 is associated with susceptibility to CRC in obese subjects through PPARγ downregulation. Hypermethylation of PPARγ gene promoter is associated with CRC through suppression of PPARγ regardless of BMI.
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Affiliation(s)
- T K Motawi
- Biochemistry Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - O G Shaker
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - M F Ismail
- Biochemistry Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - N H Sayed
- Biochemistry Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt.
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van Otterdijk SD, Binder AM, Szarc vel Szic K, Schwald J, Michels KB. DNA methylation of candidate genes in peripheral blood from patients with type 2 diabetes or the metabolic syndrome. PLoS One 2017; 12:e0180955. [PMID: 28727822 PMCID: PMC5519053 DOI: 10.1371/journal.pone.0180955] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 06/23/2017] [Indexed: 12/22/2022] Open
Abstract
INTRODUCTION The prevalence of type 2 diabetes (T2D) and the metabolic syndrome (MetS) is increasing and several studies suggested an involvement of DNA methylation in the development of these metabolic diseases. This study was designed to investigate if differential DNA methylation in blood can function as a biomarker for T2D and/or MetS. METHODS Pyrosequencing analyses were performed for the candidate genes KCNJ11, PPARγ, PDK4, KCNQ1, SCD1, PDX1, FTO and PEG3 in peripheral blood leukocytes (PBLs) from 25 patients diagnosed with only T2D, 9 patients diagnosed with T2D and MetS and 11 control subjects without any metabolic disorders. RESULTS No significant differences in gene-specific methylation between patients and controls were observed, although a trend towards significance was observed for PEG3. Differential methylation was observed between the groups in 4 out of the 42 single CpG loci located in the promoters regions of the genes FTO, KCNJ11, PPARγ and PDK4. A trend towards a positive correlation was observed for PEG3 methylation with HDL cholesterol levels. DISCUSSION Altered levels of DNA methylation in PBLs of specific loci might serve as a biomarker for T2D or MetS, although further investigation is required.
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Affiliation(s)
- Sanne D. van Otterdijk
- Institute for Prevention and Cancer Epidemiology, University Medical Center Freiburg, Freiburg, Germany
- German Cancer Consortium (DKTK), Freiburg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Alexandra M. Binder
- Department of Epidemiology, Harvard School of Public Health, Boston, MA, United States of America
| | - Katarzyna Szarc vel Szic
- Institute for Prevention and Cancer Epidemiology, University Medical Center Freiburg, Freiburg, Germany
- German Cancer Consortium (DKTK), Freiburg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Julia Schwald
- Institute for Prevention and Cancer Epidemiology, University Medical Center Freiburg, Freiburg, Germany
| | - Karin B. Michels
- Institute for Prevention and Cancer Epidemiology, University Medical Center Freiburg, Freiburg, Germany
- Department of Epidemiology, Harvard School of Public Health, Boston, MA, United States of America
- Obstetrics and Gynecology Epidemiology Center, Department of Obstetrics, Gynecology and Reproductive Biology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States of America
- * E-mail:
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17
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Solomon O, Yousefi P, Huen K, Gunier RB, Escudero-Fung M, Barcellos LF, Eskenazi B, Holland N. Prenatal phthalate exposure and altered patterns of DNA methylation in cord blood. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2017; 58:398-410. [PMID: 28556291 PMCID: PMC6488305 DOI: 10.1002/em.22095] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 04/11/2017] [Accepted: 04/12/2017] [Indexed: 05/18/2023]
Abstract
Epigenetic changes such as DNA methylation may be a molecular mechanism through which environmental exposures affect health. Phthalates are known endocrine disruptors with ubiquitous exposures in the general population including pregnant women, and they have been linked with a number of adverse health outcomes. We examined the association between in utero phthalate exposure and altered patterns of cord blood DNA methylation in 336 Mexican-American newborns. Concentrations of 11 phthalate metabolites were analyzed in maternal urine samples collected at 13 and 26 weeks gestation as a measure of fetal exposure. DNA methylation was assessed using the Infinium HumanMethylation 450K BeadChip adjusting for cord blood cell composition. To identify differentially methylated regions (DMRs) that may be more informative than individual CpG sites, we used two different approaches, DMRcate and comb-p. Regional assessment by both methods identified 27 distinct DMRs, the majority of which were in relation to multiple phthalate metabolites. Most of the significant DMRs (67%) were observed for later pregnancy (26 weeks gestation). Further, 51% of the significant DMRs were associated with the di-(2-ethylhexyl) phthalate metabolites. Five individual CpG sites were associated with phthalate metabolite concentrations after multiple comparisons adjustment (FDR), all showing hypermethylation. Genes with DMRs were involved in inflammatory response (IRAK4 and ESM1), cancer (BRCA1 and LASP1), endocrine function (CNPY1), and male fertility (IFT140, TESC, and PRDM8). These results on differential DNA methylation in newborns with prenatal phthalate exposure provide new insights and targets to explore mechanism of adverse effects of phthalates on human health. Environ. Mol. Mutagen. 58:398-410, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Olivia Solomon
- School of Public Health, Center for Environmental Research and Children’s Health (CERCH), University
of California, Berkeley, Berkeley, CA 94720, USA
| | - Paul Yousefi
- School of Public Health, Center for Environmental Research and Children’s Health (CERCH), University
of California, Berkeley, Berkeley, CA 94720, USA
| | - Karen Huen
- School of Public Health, Center for Environmental Research and Children’s Health (CERCH), University
of California, Berkeley, Berkeley, CA 94720, USA
| | - Robert B. Gunier
- School of Public Health, Center for Environmental Research and Children’s Health (CERCH), University
of California, Berkeley, Berkeley, CA 94720, USA
| | - Maria Escudero-Fung
- School of Public Health, Center for Environmental Research and Children’s Health (CERCH), University
of California, Berkeley, Berkeley, CA 94720, USA
| | - Lisa F. Barcellos
- School of Public Health, Center for Environmental Research and Children’s Health (CERCH), University
of California, Berkeley, Berkeley, CA 94720, USA
| | - Brenda Eskenazi
- School of Public Health, Center for Environmental Research and Children’s Health (CERCH), University
of California, Berkeley, Berkeley, CA 94720, USA
| | - Nina Holland
- School of Public Health, Center for Environmental Research and Children’s Health (CERCH), University
of California, Berkeley, Berkeley, CA 94720, USA
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Bowers EC, McCullough SD. Linking the Epigenome with Exposure Effects and Susceptibility: The Epigenetic Seed and Soil Model. Toxicol Sci 2017; 155:302-314. [PMID: 28049737 PMCID: PMC5291212 DOI: 10.1093/toxsci/kfw215] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The epigenome is a dynamic mediator of gene expression that shapes the way that cells, tissues, and organisms respond to their environment. Initial studies in the emerging field of "toxicoepigenetics" have described either the impact of an environmental exposure on the epigenome or the association of epigenetic signatures with the onset or progression of disease; however, the majority of these pioneering studies examined the relationship between discrete epigenetic modifications and the effects of a single environmental factor. Although these data provide critical blocks with which we construct our understanding of the role of the epigenome in susceptibility and disease, they are akin to individual letters in a complex alphabet that is used to compose the language of the epigenome. Advancing the use of epigenetic data to gain a more comprehensive understanding of the mechanisms underlying exposure effects, identify susceptible populations, and inform the next generation risk assessment depends on our ability to integrate these data in a way that accounts for their cumulative impact on gene regulation. Here we will review current examples demonstrating associations between the epigenetic impacts of intrinsic factors, such as such as age, genetics, and sex, and environmental exposures shape the epigenome and susceptibility to exposure effects and disease. We will also demonstrate how the "epigenetic seed and soil" model can be used as a conceptual framework to explain how epigenetic states are shaped by the cumulative impacts of intrinsic and extrinsic factors and how these in turn determine how an individual responds to subsequent exposure to environmental stressors.
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Affiliation(s)
- Emma C Bowers
- Curriculum in Toxicology, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Shaun D McCullough
- Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711
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Volberg V, Yousefi P, Huen K, Harley K, Eskenazi B, Holland N. CpG Methylation across the adipogenic PPARγ gene and its relationship with birthweight and child BMI at 9 years. BMC MEDICAL GENETICS 2017; 18:7. [PMID: 28122515 PMCID: PMC5267417 DOI: 10.1186/s12881-016-0365-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 12/26/2016] [Indexed: 01/05/2023]
Abstract
Background To examine methylation of the peroxisome proliferator-activated receptor γ (PPARγ) gene and its relationship with child weight status, at birth and 9 years. Methods We measured PPARγ methylation across 23 CpG sites using the Infinium Illumina 450 k array for children from the Center for the Health Assessment of Mothers and Children of Salinas (CHAMACOS) cohort at birth (N = 373) and 9 years (N = 245). Results Methylation level correlation patterns across the 23 PPARγ CpG sites were conserved between birth and 9-year ages. We found high inter-CpG correlations between sites 1–3 (methylation block 1) and also between sites 18–23 (methylation block 2) for both time points, although these patterns were less pronounced at 9 years. Additionally, sites 1–3 (north shore) had the highest intra-CpG correlations over time (r = 0.24, 0.42, and 0.3; P = 0.002, P < 0.001, P < 0.001, respectively). PPARγ methylation levels tended to increase with age, and the largest differences were observed for north shore sites (7.4%). Adjusting for sex, both site 1 and site 20 (gene body) methylation at birth was significantly and inversely associated with birth weight (β = −0.13, P = 0.033; β = −0.09, P = 0.025, respectively). Similarly, we found that site 1 and site 20 methylation at 9 years was significantly and inversely associated with 9-year BMI z-score (β = −0.41, P = 0.015; β = −0.23, P = 0.045, respectively). Conclusion Our results indicate that PPARγ methylation is highly organized and conserved over time, and highlight the potential functional importance of north shore sites, adding to a better understanding of regional human methylome patterns. Overall, our results suggest that PPARγ methylation may be associated with child body size. Electronic supplementary material The online version of this article (doi:10.1186/s12881-016-0365-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Vitaly Volberg
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California, 733 University Hall, Berkeley, CA, 94720-7360, USA
| | - Paul Yousefi
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California, 733 University Hall, Berkeley, CA, 94720-7360, USA
| | - Karen Huen
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California, 733 University Hall, Berkeley, CA, 94720-7360, USA
| | - Kim Harley
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California, 733 University Hall, Berkeley, CA, 94720-7360, USA
| | - Brenda Eskenazi
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California, 733 University Hall, Berkeley, CA, 94720-7360, USA
| | - Nina Holland
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California, 733 University Hall, Berkeley, CA, 94720-7360, USA.
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Abstract
Obesity is a complex and multifactorial disease, which likely comprises multiple subtypes. Emerging data have linked chemical exposures to obesity. As organismal response to environmental exposures includes altered gene expression, identifying the regulatory epigenetic changes involved would be key to understanding the path from exposure to phenotype and provide new tools for exposure detection and risk assessment. In this report, we summarize published data linking early-life exposure to the heavy metals, cadmium and lead, to obesity. We also discuss potential mechanisms, as well as the need for complete coverage in epigenetic screening to fully identify alterations. The keys to understanding how metal exposure contributes to obesity are improved assessment of exposure and comprehensive establishment of epigenetic profiles that may serve as markers for exposures.
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Affiliation(s)
- Sarah S Park
- Department of Biological Sciences, Center for Human Health & the Environment, North Carolina State University, Raleigh, NC 27695 USA
| | - David A Skaar
- Department of Biological Sciences, Center for Human Health & the Environment, North Carolina State University, Raleigh, NC 27695 USA
| | - Randy L Jirtle
- Department of Biological Sciences, Center for Human Health & the Environment, North Carolina State University, Raleigh, NC 27695 USA.,Department of Oncology, McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, WI 53705, USA.,Department of Sport & Exercise Sciences, Institute of Sport & Physical Activity Research, University of Bedfordshire, Bedford, Bedfordshire, UK
| | - Cathrine Hoyo
- Department of Biological Sciences, Center for Human Health & the Environment, North Carolina State University, Raleigh, NC 27695 USA
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McLaughlin T, Craig C, Liu LF, Perelman D, Allister C, Spielman D, Cushman SW. Adipose Cell Size and Regional Fat Deposition as Predictors of Metabolic Response to Overfeeding in Insulin-Resistant and Insulin-Sensitive Humans. Diabetes 2016; 65:1245-54. [PMID: 26884438 PMCID: PMC5384627 DOI: 10.2337/db15-1213] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Accepted: 02/09/2016] [Indexed: 12/20/2022]
Abstract
Obesity is associated with insulin resistance, but significant variability exists between similarly obese individuals, pointing to qualitative characteristics of body fat as potential mediators. To test the hypothesis that obese, insulin-sensitive (IS) individuals possess adaptive adipose cell/tissue responses, we measured subcutaneous adipose cell size, insulin suppression of lipolysis, and regional fat responses to short-term overfeeding in BMI-matched overweight/obese individuals classified as IS or insulin resistant (IR). At baseline, IR subjects exhibited significantly greater visceral adipose tissue (VAT), intrahepatic lipid (IHL), plasma free fatty acids, adipose cell diameter, and percentage of small adipose cells. With weight gain (3.1 ± 1.4 kg), IR subjects demonstrated no significant change in adipose cell size, VAT, or insulin suppression of lipolysis and only 8% worsening of insulin-mediated glucose uptake (IMGU). Alternatively, IS subjects demonstrated significant adipose cell enlargement; decrease in the percentage of small adipose cells; increase in VAT, IHL, and lipolysis; 45% worsening of IMGU; and decreased expression of lipid metabolism genes. Smaller baseline adipose cell size and greater enlargement with weight gain predicted decline in IMGU, as did increase in IHL and VAT and decrease in insulin suppression of lipolysis. Weight gain in IS humans causes maladaptive changes in adipose cells, regional fat distribution, and insulin resistance. The correlation between development of insulin resistance and changes in adipose cell size, VAT, IHL, and insulin suppression of lipolysis highlight these factors as potential mediators between obesity and insulin resistance.
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Affiliation(s)
- Tracey McLaughlin
- Department of Medicine, Stanford University School of Medicine, Stanford, CA
| | - Colleen Craig
- Department of Medicine, Stanford University School of Medicine, Stanford, CA
| | - Li-Fen Liu
- Department of Medicine, Stanford University School of Medicine, Stanford, CA
| | - Dalia Perelman
- Department of Medicine, Stanford University School of Medicine, Stanford, CA
| | - Candice Allister
- Department of Medicine, Stanford University School of Medicine, Stanford, CA
| | - Daniel Spielman
- Department of Medicine, Stanford University School of Medicine, Stanford, CA
| | - Samuel W Cushman
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
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