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Lamichhane DK, Leem JH, Park CS, Ha M, Ha EH, Kim HC, Lee JY, Ko JK, Kim Y, Hong YC. Associations between prenatal lead exposure and birth outcomes: Modification by sex and GSTM1/GSTT1 polymorphism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 619-620:176-184. [PMID: 29145054 DOI: 10.1016/j.scitotenv.2017.09.159] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 09/14/2017] [Accepted: 09/16/2017] [Indexed: 06/07/2023]
Abstract
Maternal lead exposure is associated with poor birth outcomes. However, modifying effects of polymorphism in glutathione S-transferases (GST) gene and infant sex remain unexplored. Our aim was to evaluate whether associations between prenatal lead and birth outcomes differed by maternal GST genes and infant sex. Prospective data of 782 mother-child pairs from Mothers and Children's Environmental Health (MOCEH) study were used. The genotyping of GST-mu 1 (GSTM1) and theta-1 (GSTT1) polymorphisms was carried out using polymerase chain reaction. Multivariable linear regression was used to examine whether the association between blood lead (BPb) level and birth outcomes (birthweight, length, and head circumference) varied by maternal GST genes and sex. We did not find a statistically significant association between prenatal BPb levels and birth outcomes; in stratified analyses, the association between higher BPb level during early pregnancy and lower birthweight (β=-224 per square root increase in BPb; 95% confidence interval (CI): -426, -21; false discovery rate p=0.036) was significant in males of mothers with GSTM1 null. Results were similar for head circumference model (β=-0.78 per square root increase in BPb; 95% CI: -1.69, 0.14, p=0.095), but the level of significance was borderline. Head circumference model showed a significant three-way interaction among BPb during early pregnancy, GSTM1, and sex (p=0.046). For combined analysis with GSTM1 and GSTT1, GSTM1 null and GSTT1 present group showed a significant inverse association of BPb with birthweight and head circumference in males. Our findings of the most evident effects of BPb on the reduced birthweight and head circumference in male born to the mother with GSTM1 null may suggest a biological interaction among lead, GST genes and sex in detoxification process during fetal development.
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Affiliation(s)
- Dirga Kumar Lamichhane
- Department of Social and Preventive Medicine, College of Medicine, Inha University, Incheon, Republic of Korea
| | - Jong-Han Leem
- Department of Social and Preventive Medicine, College of Medicine, Inha University, Incheon, Republic of Korea; Department of Occupational and Environmental Medicine, Inha University Hospital, Incheon, Republic of Korea.
| | - Chang-Shin Park
- Department of Pharmacology, College of Medicine, Inha University, Incheon, Republic of Korea
| | - Mina Ha
- Department of Preventive Medicine, College of Medicine, Dankook University, Cheonan, Republic of Korea
| | - Eun-Hee Ha
- Department of Preventive Medicine, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
| | - Hwan-Cheol Kim
- Department of Social and Preventive Medicine, College of Medicine, Inha University, Incheon, Republic of Korea; Department of Occupational and Environmental Medicine, Inha University Hospital, Incheon, Republic of Korea
| | - Ji-Young Lee
- Department of Preventive Medicine, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
| | - Jung Keun Ko
- Department of Social and Preventive Medicine, College of Medicine, Inha University, Incheon, Republic of Korea
| | - Yangho Kim
- Department of Occupational and Environmental Medicine, University of Ulsan, College of Medicine, Ulsan University Hospital, Ulsan, Republic of Korea
| | - Yun-Chul Hong
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea
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Singh G, Singh V, Wang ZX, Voisin G, Lefebvre F, Navenot JM, Evans B, Verma M, Anderson DW, Schneider JS. Effects of developmental lead exposure on the hippocampal methylome: Influences of sex and timing and level of exposure. Toxicol Lett 2018; 290:63-72. [PMID: 29571894 DOI: 10.1016/j.toxlet.2018.03.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 02/15/2018] [Accepted: 03/19/2018] [Indexed: 12/21/2022]
Abstract
Developmental lead (Pb) exposure results in persistent cognitive/behavioral impairments as well as an elevated risk for developing a variety of diseases in later life. Environmental exposures during development can result in a variety of epigenetic changes, including alterations in DNA methylation, that can influence gene expression patterns and affect the function and development of the nervous system. The present promoter-based methylation microarray profiling study explored the extent to which developmental Pb exposure may modify the methylome of a brain region, hippocampus, known to be sensitive to the effects of Pb exposure. Male and female Long Evans rats were exposed to 0 ppm, 150 ppm, 375 ppm, or 750 ppm Pb through perinatal exposures (gestation through lactation), early postnatal exposures (birth through weaning), or long-term postnatal exposures (birth through postnatal day 55). Results showed a significant contribution of sex to the hippocampal methylome and effects of Pb exposure level, with non-linear dose response effects on methylation. Surprisingly, the developmental period of exposure contributed only a small amount of variance to the overall data and gene ontology (GO) analysis revealed the largest number of overrepresented GO terms in the groups with the lowest level of exposure. The highest number of significant differentially methylated regions was found in females exposed to Pb at the lowest exposure level. Our data reinforce the significant effect that low level Pb exposure may have on gene-specific DNA methylation patterns in brain and that this occurs in a sex-dependent manner.
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Affiliation(s)
- G Singh
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA.
| | - V Singh
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Zi-Xuan Wang
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - G Voisin
- Atelerics S.E.N.C, Montreal, QC, Canada
| | - F Lefebvre
- Department of Human Genetics, McGill University and Genome Quebec Innovation Centre, Montreal, QC, Canada
| | - J-M Navenot
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - B Evans
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - M Verma
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - D W Anderson
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - J S Schneider
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
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McCabe C, Anderson OS, Montrose L, Neier K, Dolinoy DC. Sexually Dimorphic Effects of Early-Life Exposures to Endocrine Disruptors: Sex-Specific Epigenetic Reprogramming as a Potential Mechanism. Curr Environ Health Rep 2018; 4:426-438. [PMID: 28980159 DOI: 10.1007/s40572-017-0170-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
PURPOSE OF REVIEW The genetic material of every organism exists within the context of regulatory networks that govern gene expression-collectively called the epigenome. Animal models and human birth cohort studies have revealed key developmental periods that are important for epigenetic programming and vulnerable to environmental insults. Thus, epigenetics represent a potential mechanism through which sexually dimorphic effects of early-life exposures such as endocrine-disrupting chemicals (EDCs) manifest. RECENT FINDINGS Several animal studies, and to a lesser extent human studies, have evaluated life-course sexually dimorphic health effects following developmental toxicant exposures; many fewer studies, however, have evaluated epigenetics as a mechanism mediating developmental exposures and later outcomes. To evaluate epigenetic reprogramming as a mechanistic link of sexually dimorphic early-life EDCs exposures, the following criteria should be met: (1) well-characterized exposure paradigm that includes relevant windows for developmental epigenetic reprogramming; (2) evaluation of sex-specific exposure-related epigenetic change; and (3) observation of a sexually dimorphic phenotype in either childhood, adolescence, or adulthood.
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Affiliation(s)
- Carolyn McCabe
- Nutritonal Sciences, University of Michigan School of Public Health, 1415 Washington Heights, Ann Arbor, MI, 48109-2029, USA
| | - Olivia S Anderson
- Nutritonal Sciences, University of Michigan School of Public Health, 1415 Washington Heights, Ann Arbor, MI, 48109-2029, USA
| | - Luke Montrose
- Environmental Health Sciences, University of Michigan School of Public Health, 1415 Washington Heights, Ann Arbor, MI, 48109-2029, USA
| | - Kari Neier
- Environmental Health Sciences, University of Michigan School of Public Health, 1415 Washington Heights, Ann Arbor, MI, 48109-2029, USA
| | - Dana C Dolinoy
- Nutritonal Sciences, University of Michigan School of Public Health, 1415 Washington Heights, Ann Arbor, MI, 48109-2029, USA. .,Environmental Health Sciences, University of Michigan School of Public Health, 1415 Washington Heights, Ann Arbor, MI, 48109-2029, USA.
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Khalil SR, Elhady WM, Elewa YH, Abd El-Hameed NE, Ali SA. Possible role of Arthrospira platensis in reversing oxidative stress-mediated liver damage in rats exposed to lead. Biomed Pharmacother 2018; 97:1259-1268. [DOI: 10.1016/j.biopha.2017.11.045] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 11/04/2017] [Accepted: 11/07/2017] [Indexed: 12/11/2022] Open
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Chen C, Li Q, Nie X, Han B, Chen Y, Xia F, Zhai H, Wang N, Lu Y. Association of lead exposure with cardiovascular risk factors and diseases in Chinese adults. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:22275-22283. [PMID: 28799038 DOI: 10.1007/s11356-017-9884-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 08/01/2017] [Indexed: 06/07/2023]
Abstract
We aimed to determine whether lead exposure was associated with cardiovascular diseases (CVD) and risk factors in Chinese adults. Five thousand three hundred and forty-eight subjects were enrolled from 16 sites in China. Blood lead level (BLL) was measured by atomic absorption spectrometry. Cardiovascular diseases included coronary heart disease, stroke, and myocardial infarction. Cardiovascular risk factors included body mass index (BMI), fasting plasma glucose (FPG), lipid profile, and blood pressure. We found that 5.9% of the study population had prevalent CVD. Medians (interquartile range) of BLLs were 44.00 μg/L (29.00-62.48) for men and 37.70 μg/L (25.00-54.60) for women. The prevalence of CVD gradually and markedly increased with increasing BLL quartiles in women (P for trend < 0.01), but not in men. After adjustment for age, current smoking, and drinking, BLLs were independently associated with cardiovascular risk factors including BMI, FPG, and blood pressure in women (all P < 0.05), but not in men. Binary logistic regression showed that increased quartiles of BLL were significantly and positively associated with increased odds ratio of prevalent CVD (P for trend < 0.01) in women. This association was independent of age, smoking, drinking, education, diabetes, obesity, hypertension, and lipid profile. In conclusion, BLL in the range currently considered acceptable is independently associated with CVD, which is the leading cause of death in China. Further practical and cost-effective efforts to reduce lead exposure may be warranted.
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Affiliation(s)
- Chi Chen
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Qin Li
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Xiaomin Nie
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Bing Han
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Yi Chen
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Fangzhen Xia
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Hualing Zhai
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Ningjian Wang
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China.
| | - Yingli Lu
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China.
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56
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Montrose L, Faulk C, Francis J, Dolinoy D. Perinatal lead (Pb) exposure results in sex and tissue-dependent adult DNA methylation alterations in murine IAP transposons. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2017; 58:540-550. [PMID: 28833526 PMCID: PMC5784428 DOI: 10.1002/em.22119] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 05/25/2017] [Accepted: 05/25/2017] [Indexed: 05/17/2023]
Abstract
Epidemiological and animal data suggest that adult chronic disease is influenced by early-life exposure-induced changes to the epigenome. Previously, we observed that perinatal lead (Pb) exposure results in persistent murine metabolic- and activity-related effects. Using phylogenetic and DNA methylation analysis, we have also identified novel intracisternal A particle (IAP) retrotransposons exhibiting regions of variable methylation as candidate loci for environmental effects on the epigenome. Here, we now evaluate brain and kidney DNA methylation profiles of four representative IAPs in adult mice exposed to human physiologically relevant levels of Pb two weeks prior to mating through lactation. When IAPs across the genome were evaluated globally, average (sd) methylation levels were 92.84% (3.74) differing by tissue (P < 0.001), but not sex or dose. By contrast, the four individual IAPs displayed tissue-specific Pb and sex effects. Medium Pb-exposed mice had 3.86% less brain methylation at IAP 110 (P < 0.01), while high Pb-exposed mice had 2.83% less brain methylation at IAP 236 (P = 0.01) and 1.77% less at IAP 506 (P = 0.05). Individual IAP DNA methylation differed by sex for IAP 110 in the brain and kidney, IAP 236 in the kidney, and IAP 1259 in the kidney. Using Tomtom, we identified three binding motifs that matched to each of our novel IAPs impacted by Pb, one of which (HMGA2) has been linked to metabolic-related conditions in both mice and humans. Thus, these recently identified IAPs display tissue-specific environmental lability as well as sex-specific differences supporting an epigenetic link between early exposure to Pb and later-in-life health outcomes. Environ. Mol. Mutagen. 58:540-550, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- L. Montrose
- Environmental Health Sciences, University of Michigan
| | - C. Faulk
- Animal Science, University of Minnesota
| | - J. Francis
- Environmental Health Sciences, University of Michigan
| | - D.C. Dolinoy
- Environmental Health Sciences, University of Michigan
- Nutritional Sciences, University of Michigan
- Corresponding author: Dana C. Dolinoy, 1415 Washington Heights, Ann Arbor, Michigan 48109-2029, Tel: 734 647-3155,
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Wu S, Hivert MF, Cardenas A, Zhong J, Rifas-Shiman SL, Agha G, Colicino E, Just AC, Amarasiriwardena C, Lin X, Litonjua AA, DeMeo DL, Gillman MW, Wright RO, Oken E, Baccarelli AA. Exposure to Low Levels of Lead in Utero and Umbilical Cord Blood DNA Methylation in Project Viva: An Epigenome-Wide Association Study. ENVIRONMENTAL HEALTH PERSPECTIVES 2017; 125:087019. [PMID: 28858830 PMCID: PMC5783669 DOI: 10.1289/ehp1246] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 05/26/2017] [Accepted: 06/13/2017] [Indexed: 05/17/2023]
Abstract
BACKGROUND Early-life exposure to lead is associated with deficits in neurodevelopment and with hematopoietic system toxicity. DNA methylation may be one of the underlying mechanisms for the adverse effects of prenatal lead on the offspring, but epigenome-wide methylation data for low levels of prenatal lead exposure are lacking. OBJECTIVES We investigated the association between prenatal maternal lead exposure and epigenome-wide DNA methylation in umbilical cord blood nucleated cells in Project Viva, a prospective U.S.-based prebirth cohort with relatively low levels of lead exposure. METHODS Among 268 mother-infant pairs, we measured lead concentrations in red blood cells (RBC) from prenatal maternal blood samples, and using HumanMethylation450 Bead Chips, we measured genome-wide methylation levels at 482,397 CpG loci in umbilical cord blood and retained 394,460 loci after quality control. After adjustment for batch effects, cell types, and covariates, we used robust linear regression models to examine associations of prenatal lead exposure with DNA methylation in cord blood at epigenome-wide significance level [false discovery rate (FDR)<0.05]. RESULTS The mean [standard deviation (SD)] maternal RBC lead level was 1.22 (0.63) μg/dL. CpG cg10773601 showed an epigenome-wide significant negative association with prenatal lead exposure (-1.4% per doubling increase in lead exposure; p=2.3×10-7) and was annotated to C-Type Lectin Domain Family 11, Member A (CLEC11A), which functions as a growth factor for primitive hematopoietic progenitor cells. In sex-specific analyses, we identified more CpGs with FDR<0.05 among female infants (n=38) than among male infants (n=2). One CpG (cg24637308), which showed a strong negative association with prenatal lead exposure among female infants (-4.3% per doubling increase in lead exposure; p=1.1×10-06), was annotated to Dynein Heavy Chain Domain 1 gene (DNHD1) which is highly expressed in human brain. Interestingly, there were strong correlations between blood and brain methylation for CpG (cg24637308) based on another independent set of samples with a high proportion of female participants. CONCLUSION Prenatal low-level lead exposure was associated with newborn DNA methylation, particularly in female infants. https://doi.org/10.1289/EHP1246.
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Affiliation(s)
- Shaowei Wu
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University , Beijing, China
| | - Marie-France Hivert
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute , Boston, Massachusetts, USA
| | - Andres Cardenas
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute , Boston, Massachusetts, USA
| | - Jia Zhong
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University , New York, New York, USA
| | - Sheryl L Rifas-Shiman
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute , Boston, Massachusetts, USA
| | - Golareh Agha
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University , New York, New York, USA
| | - Elena Colicino
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University , New York, New York, USA
| | - Allan C Just
- Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Chitra Amarasiriwardena
- Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Xihong Lin
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Augusto A Litonjua
- Channing Division of Network Medicine, Brigham and Women's Hospital, Harvard Medical School , Boston, Massachusetts, USA
| | - Dawn L DeMeo
- Channing Division of Network Medicine, Brigham and Women's Hospital, Harvard Medical School , Boston, Massachusetts, USA
| | - Matthew W Gillman
- Environmental Influences on Child Health Outcomes (ECHO) Office of the Director, National Institutes of Health, Department of Health and Human Services , Rockville, Maryland, USA
| | - Robert O Wright
- Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Emily Oken
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute , Boston, Massachusetts, USA
| | - Andrea A Baccarelli
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University , New York, New York, USA
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58
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Varma G, Sobolewski M, Cory-Slechta DA, Schneider JS. Sex- and brain region- specific effects of prenatal stress and lead exposure on permissive and repressive post-translational histone modifications from embryonic development through adulthood. Neurotoxicology 2017; 62:207-217. [PMID: 28712943 DOI: 10.1016/j.neuro.2017.07.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 07/03/2017] [Indexed: 12/19/2022]
Abstract
Developmental exposure to prenatal stress (PS) and lead (Pb) can affect brain development and adversely influence behavior and cognition. Epigenetic-based gene regulation is crucial for normal brain development and mis-regulation, in any form, can result in neurodevelopmental disorders. Post-translational histone modifications (PTHMs) are an integral and dynamic component of the epigenetic machinery involved in gene regulation. Exposures to Pb and/or PS may alter PTHM profiles, promoting lifelong alterations in brain function observed following Pb±PS exposure. Here we examined the effects of Pb±PS on global levels of activating marks H3K9Ac and H3K4Me3 and repressive marks H3K9Me2 and H3K27Me3 at different developmental stages: E18, PND0, PND6 and PND60. Dams were exposed to 0 or 100ppm Pb beginning 2 months prior to breeding followed by no PS (NS) or PS resulting in 4 offspring treatment groups per sex: 0-NS (control), 0-PS, 100-NS and 100-PS. Global levels of PTHMs varied from E18 through adulthood even in control mice, and were influenced by sex and brain-region. The developmental trajectory of these PTHM levels was further modified by Pb±PS in a sex-, brain region- and age-dependent manner. Females showed a preferential response to Pb alone in frontal cortex (FC) and differentially to PS alone and combined Pb+PS in hippocampus (HIPP). In males, PS-induced increases in PTHM levels in FC, whereas PS produced reductions in HIPP. Pb±PS-based changes in PTHM levels continued to be observed in adulthood (PND60), demonstrating the lasting effect of these early life environmental events on these histone marks. These results indicate that epigenetic consequences of Pb±PS and their contribution to mechanisms of toxicity are sex dependent. Additional studies will assist in understanding the functional significance of these changes in PTHM levels on expression of individual genes, functional pathways, and ultimately, their behavioral consequences.
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Affiliation(s)
- G Varma
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, United States
| | - M Sobolewski
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester NY, United States
| | - D A Cory-Slechta
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester NY, United States
| | - J S Schneider
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, United States.
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Modgil S, Cameotra SS, Sharma VL, Anand A. Early Life Pb Exposure and its Effect on Later Life Retinal Degeneration. J Cell Biochem 2017; 118:3213-3224. [DOI: 10.1002/jcb.25968] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 03/01/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Shweta Modgil
- Neuroscience Research LabDepartment of NeurologyPost Graduate Institute of Medical Education and ResearchChandigarhIndia
- Department of ZoologyPanjab UniversityChandigarhIndia
| | | | | | - Akshay Anand
- Neuroscience Research LabDepartment of NeurologyPost Graduate Institute of Medical Education and ResearchChandigarhIndia
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60
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Gonzalez-Nahm S, Mendez M, Robinson W, Murphy SK, Hoyo C, Hogan V, Rowley D. Low maternal adherence to a Mediterranean diet is associated with increase in methylation at the MEG3-IG differentially methylated region in female infants. ENVIRONMENTAL EPIGENETICS 2017; 3:dvx007. [PMID: 29492309 PMCID: PMC5804547 DOI: 10.1093/eep/dvx007] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 02/09/2017] [Accepted: 03/12/2017] [Indexed: 05/17/2023]
Abstract
Diet is dictated by the surrounding environment, as food access and availability may change depending on where one lives. Maternal diet during pregnancy is an important part of the in utero environment, and may affect the epigenome. Studies looking at overall diet pattern in relation to DNA methylation have been lacking. The Mediterranean diet is known for its health benefits, including decreased inflammation, weight loss, and management of chronic diseases. This study assesses the association between maternal adherence to a Mediterranean diet pattern during pregnancy and infant DNA methylation at birth. Mediterranean diet adherence in early pregnancy was measured in 390 women enrolled in the Newborn Epigenetic Study, and DNA methylation was assessed in their infants at birth. Multinomial logistic regression was used to assess the association between adherence to a Mediterranean diet and infant methylation at the MEG3, MEG3-IG, pleiomorphic adenoma gene-like 1, insulin-like growth factor 2 gene, H19, mesoderm-specific transcript, neuronatin, paternally expressed gene 3, sarcoglycan and paternally expressed gene 10 regions, measured by pyrosequencing. Infants of mothers with a low adherence to a Mediterranean diet had a greater odds of hypo-methylation at the MEG3-IG differentially methylated region (DMR). Sex-stratified models showed that this association was present in girls only. This study provides early evidence on the association between overall diet pattern and methylation at the 9 DMRs included in this study, and suggests that maternal diet can have a sex-specific impact on infant DNA methylation at specific imprinted DMRs.
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Affiliation(s)
- Sarah Gonzalez-Nahm
- Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, 624 N. Broadway, HH 904, Baltimore, MD 21205, USADepartment of NutritionDepartment of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USAOB/GYN, Duke University Medical CenterDepartment of Environmental Health Science, North Carolina State University, NC, USADepartment of Food, Health and Well-Being, W.K. Kellogg FoundationDepartment of Maternal and Child Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Michelle Mendez
- Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, 624 N. Broadway, HH 904, Baltimore, MD 21205, USADepartment of NutritionDepartment of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USAOB/GYN, Duke University Medical CenterDepartment of Environmental Health Science, North Carolina State University, NC, USADepartment of Food, Health and Well-Being, W.K. Kellogg FoundationDepartment of Maternal and Child Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Whitney Robinson
- Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, 624 N. Broadway, HH 904, Baltimore, MD 21205, USADepartment of NutritionDepartment of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USAOB/GYN, Duke University Medical CenterDepartment of Environmental Health Science, North Carolina State University, NC, USADepartment of Food, Health and Well-Being, W.K. Kellogg FoundationDepartment of Maternal and Child Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Susan K. Murphy
- Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, 624 N. Broadway, HH 904, Baltimore, MD 21205, USADepartment of NutritionDepartment of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USAOB/GYN, Duke University Medical CenterDepartment of Environmental Health Science, North Carolina State University, NC, USADepartment of Food, Health and Well-Being, W.K. Kellogg FoundationDepartment of Maternal and Child Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Cathrine Hoyo
- Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, 624 N. Broadway, HH 904, Baltimore, MD 21205, USADepartment of NutritionDepartment of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USAOB/GYN, Duke University Medical CenterDepartment of Environmental Health Science, North Carolina State University, NC, USADepartment of Food, Health and Well-Being, W.K. Kellogg FoundationDepartment of Maternal and Child Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Vijaya Hogan
- Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, 624 N. Broadway, HH 904, Baltimore, MD 21205, USADepartment of NutritionDepartment of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USAOB/GYN, Duke University Medical CenterDepartment of Environmental Health Science, North Carolina State University, NC, USADepartment of Food, Health and Well-Being, W.K. Kellogg FoundationDepartment of Maternal and Child Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Diane Rowley
- Department of Health, Behavior and Society, Bloomberg School of Public Health, Johns Hopkins University, 624 N. Broadway, HH 904, Baltimore, MD 21205, USADepartment of NutritionDepartment of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USAOB/GYN, Duke University Medical CenterDepartment of Environmental Health Science, North Carolina State University, NC, USADepartment of Food, Health and Well-Being, W.K. Kellogg FoundationDepartment of Maternal and Child Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Luo Y, McCullough LE, Tzeng JY, Darrah T, Vengosh A, Maguire RL, Maity A, Samuel-Hodge C, Murphy SK, Mendez MA, Hoyo C. Maternal blood cadmium, lead and arsenic levels, nutrient combinations, and offspring birthweight. BMC Public Health 2017; 17:354. [PMID: 28438148 PMCID: PMC5402649 DOI: 10.1186/s12889-017-4225-8] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 04/05/2017] [Indexed: 12/24/2022] Open
Abstract
Background Cadmium (Cd), lead (Pb) and arsenic (As) are common environmental contaminants that have been associated with lower birthweight. Although some essential metals may mitigate exposure, data are inconsistent. This study sought to evaluate the relationship between toxic metals, nutrient combinations and birthweight among 275 mother-child pairs. Methods Non-essential metals, Cd, Pb, As, and essential metals, iron (Fe), zinc (Zn), selenium (Se), copper (Cu), calcium (Ca), magnesium (Mg), and manganese (Mn) were measured in maternal whole blood obtained during the first trimester using inductively coupled plasma mass spectrometry. Folate concentrations were measured by microbial assay. Birthweight was obtained from medical records. We used quantile regression to evaluate the association between toxic metals and nutrients due to their underlying wedge-shaped relationship. Ordinary linear regression was used to evaluate associations between birth weight and toxic metals. Results After multivariate adjustment, the negative association between Pb or Cd and a combination of Fe, Se, Ca and folate was robust, persistent and dose-dependent (p < 0.05). However, a combination of Zn, Cu, Mn and Mg was positively associated with Pb and Cd levels. While prenatal blood Cd and Pb were also associated with lower birthweight. Fe, Se, Ca and folate did not modify these associations. Conclusion Small sample size and cross-sectional design notwithstanding, the robust and persistent negative associations between some, but not all, nutrient combinations with these ubiquitous environmental contaminants suggest that only some recommended nutrient combinations may mitigate toxic metal exposure in chronically exposed populations. Larger longitudinal studies are required to confirm these findings. Electronic supplementary material The online version of this article (doi:10.1186/s12889-017-4225-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yiwen Luo
- Bioinformatics Research Center, North Carolina State University, Raleigh, NC, USA.,Department of Statistics, North Carolina State University, Raleigh, NC, USA
| | | | - Jung-Ying Tzeng
- Bioinformatics Research Center, North Carolina State University, Raleigh, NC, USA. .,Department of Statistics, North Carolina State University, Raleigh, NC, USA. .,Department of Statistics, National Cheng-Kung University, Tainan, Taiwan.
| | - Thomas Darrah
- School of Earth Sciences, The Ohio State University, Columbus, OH, USA
| | - Avner Vengosh
- Nicholas School of the Environment, Duke University, Durham, NC, USA
| | - Rachel L Maguire
- Department of Biological Sciences, North Carolina State University, Raleigh, NC, 27533, USA
| | - Arnab Maity
- Department of Statistics, North Carolina State University, Raleigh, NC, USA
| | | | | | | | - Cathrine Hoyo
- Department of Biological Sciences, North Carolina State University, Raleigh, NC, 27533, USA.
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Çetin İ, Nalbantcilar MT, İnci R, Güler MS, Tosun K, Nazik A. Correlation of drinking water nutritional element levels with body composition of women aged 55-70 years living in Batman province. DICLE MEDICAL JOURNAL 2017. [DOI: 10.5798/dicletip.298617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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63
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Sun H, Wang N, Nie X, Zhao L, Li Q, Cang Z, Chen C, Lu M, Cheng J, Zhai H, Xia F, Ye L, Lu Y. Lead Exposure Induces Weight Gain in Adult Rats, Accompanied by DNA Hypermethylation. PLoS One 2017; 12:e0169958. [PMID: 28107465 PMCID: PMC5249225 DOI: 10.1371/journal.pone.0169958] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 12/27/2016] [Indexed: 12/20/2022] Open
Abstract
Objective Previous studies have revealed the association of lead (Pb) exposure with obesity. DNA methylation alteration has been suggested to be one of the regulatory mechanisms of obesity. We aimed to explore whether Pb exposure is related with weight gain and DNA methylation alteration. Methods Male adult 8 week Wistar rats were divided into 5 groups: the normal chow diet (NCD); the NCD+0.05%Pb; the NCD+0.15%Pb; the NCD+0.45%Pb and the high fat diet. Rats were exposed to different dosages of Pb through drinking water for 21 weeks. Body weight, fasted blood glucose level, fasted insulin level, homeostasis assessment of insulin resistance (HOMA-IR) index and lipid profile were detected. Intra-peritoneal glucose tolerance test (IPGTT) was constructed to evaluate the glucose tolerance. Lipid accumulation of liver was detected and liver DNA underwent whole genome bisulfite sequencing. Results The NCD+0.05%Pb group had significantly greater weight, HOMA-IR and triglycerides, and lower glucose intolerance than the NCD group (P <0.05). This group also showed hepatic lipid accumulation. These metabolic changes were not observed in the other two Pb dosage groups. Furthermore, DNA hypermethylation extended along pathways related to glucose and lipid metabolism in NCD+0.05%Pb group. Conclusion Pb exposure resulted in dose-specific weight gain in adult Wistar rats, accompanied by alteration of DNA methylation.
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Affiliation(s)
- Honglin Sun
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Ningjian Wang
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Xiaomin Nie
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Li Zhao
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Qin Li
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Zhen Cang
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Chi Chen
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Meng Lu
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Jing Cheng
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Hualing Zhai
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Fangzhen Xia
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Lin Ye
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
- * E-mail: (YL); (LY)
| | - Yingli Lu
- Institute and Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
- * E-mail: (YL); (LY)
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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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Goodrich JM, Dolinoy DC, Sánchez BN, Zhang Z, Meeker JD, Mercado-Garcia A, Solano-González M, Hu H, Téllez-Rojo MM, Peterson KE. Adolescent epigenetic profiles and environmental exposures from early life through peri-adolescence. ENVIRONMENTAL EPIGENETICS 2016; 2:dvw018. [PMID: 29492298 PMCID: PMC5804533 DOI: 10.1093/eep/dvw018] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Accepted: 07/18/2016] [Indexed: 05/07/2023]
Abstract
Epigenetic perturbations induced by environmental exposures at susceptible lifestages contribute to disease development. Even so, the influence of early life and ongoing exposures on the adolescent epigenome is rarely examined. We examined the association of exposure biomarkers for lead (Pb), bisphenol A (BPA), and nine phthalates metabolites with blood leukocyte DNA methylation at LINE-1 repetitive elements and environmentally responsive genes ( IGF2 , H19 , and HSD11B2 ) in peri-adolescents. Participants ( n = 247) from the Early Life Exposures in Mexico to Environmental Toxicants (ELEMENT) birth cohorts were followed-up once between the ages of 8 and 14 years, and concurrent exposures were measured in biospecimen collected at that time (blood Pb, urinary BPA, and phthalate metabolites). Prenatal and childhood exposures to Pb were previously approximated using maternal and child samples. BPA and phthalate metabolites were measured in third trimester maternal urine samples. Significant associations ( P < 0.05) were observed between DNA methylation and exposure biomarkers that were gene and biomarker specific. For example, Pb was only associated with LINE-1 hypomethylation during pregnancy ( P = 0.04), while early childhood Pb was instead associated with H19 hypermethylation ( P = 0.04). Concurrent urinary mono (2-ethylhexyl) phthalate (MEHP) was associated with HSD11B2 hypermethylation ( P = 0.005). Sex-specific associations, particularly among males, were also observed. In addition to single exposure models, principal component analysis was employed to examine exposure mixtures. This method largely corroborated the findings of the single exposure models. This study along with others in the field suggests that environment-epigenetic relationships vary by chemical, exposure timing, and sex.
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Affiliation(s)
- Jaclyn M. Goodrich
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, MI, USA
| | - Dana C. Dolinoy
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, MI, USA
- Department of Nutritional Sciences, University of Michigan School of Public Health, Ann Arbor, MI, USA
- Center for Human Growth and Development, University of Michigan, Ann Arbor, MI, USA
| | - Brisa N. Sánchez
- Department of Biostatistics, University of Michigan School of Public Health, Ann Arbor, MI, USA
| | - Zhenzhen Zhang
- Department of Biostatistics, University of Michigan School of Public Health, Ann Arbor, MI, USA
| | - John D. Meeker
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, MI, USA
| | - Adriana Mercado-Garcia
- Center for Research on Nutrition and Health, National Institute of Public Health, Cuernavaca, Morelos, México
| | - Maritsa Solano-González
- Center for Research on Nutrition and Health, National Institute of Public Health, Cuernavaca, Morelos, México
| | - Howard Hu
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
| | - Martha M. Téllez-Rojo
- Center for Research on Nutrition and Health, National Institute of Public Health, Cuernavaca, Morelos, México
| | - Karen E. Peterson
- Department of Nutritional Sciences, University of Michigan School of Public Health, Ann Arbor, MI, USA
- Center for Human Growth and Development, University of Michigan, Ann Arbor, MI, USA
- Department of Nutrition, Harvard School of Public Health, Boston, MA, USA
- *Correspondence address: 1415 Washington Heights, Ann Arbor, MI 48109-2029, USA. Tel: +1 734 647 1923; Fax: +1 734 936 7283; E-mail:
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66
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Abstract
Epigenetic changes are caused by biochemical regulators of gene expression that can be transferred across generations or through cell division. Epigenetic modifications can arise from a variety of environmental exposures including undernutrition, obesity, physical activity, stress and toxins. Transient epigenetic changes across the entire genome can influence metabolic outcomes and might or might not be heritable. These modifications direct and maintain the cell-type specific gene expression state. Transient epigenetic changes can be driven by DNA methylation and histone modification in response to environmental stressors. A detailed understanding of the epigenetic signatures of insulin resistance and the adaptive response to exercise might identify new therapeutic targets that can be further developed to improve insulin sensitivity and prevent obesity. This Review focuses on the current understanding of mechanisms by which lifestyle factors affect the epigenetic landscape in type 2 diabetes mellitus and obesity. Evidence from the past few years about the potential mechanisms by which diet and exercise affect the epigenome over several generations is discussed.
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Affiliation(s)
- Romain Barrès
- The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Integrative Physiology, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, Copenhagen 2200, Denmark
| | - Juleen R Zierath
- The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Integrative Physiology, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, Copenhagen 2200, Denmark
- Department of Molecular Medicine and Department of Physiology and Pharmacology, Section of Integrative Physiology, Karolinska Institutet, von Eulers väg 4a, SE 171 77 Stockholm, Sweden
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Howe CG, Liu X, Hall MN, Slavkovich V, Ilievski V, Parvez F, Siddique AB, Shahriar H, Uddin MN, Islam T, Graziano JH, Costa M, Gamble MV. Associations between Blood and Urine Arsenic Concentrations and Global Levels of Post-Translational Histone Modifications in Bangladeshi Men and Women. ENVIRONMENTAL HEALTH PERSPECTIVES 2016; 124:1234-40. [PMID: 26967670 PMCID: PMC4977054 DOI: 10.1289/ehp.1510412] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 10/21/2015] [Accepted: 02/22/2016] [Indexed: 05/23/2023]
Abstract
BACKGROUND Exposure to inorganic arsenic is associated with numerous adverse health outcomes, with susceptibility differing by sex. Although evidence from in vitro studies suggests that arsenic alters post-translational histone modifications (PTHMs), evidence in humans is limited. OBJECTIVES The objectives were to determine: a) if arsenic exposure is associated with global (percent) levels of PTHMs H3K36me2, H3K36me3, and H3K79me2 in a sex-dependent manner, and b) if %PTHMs are stable when arsenic exposure is reduced. METHODS We examined associations between arsenic, measured in blood and urine, and %PTHMs in peripheral blood mononuclear cells from 317 participants enrolled in the Bangladesh Folic Acid and Creatine Trial (FACT). We also examined the stability of %PTHMs after the use of arsenic-removal water filters (n = 60). RESULTS Associations between natural log-transformed (ln) urinary arsenic, adjusted for creatinine (uAsCr), and %H3K36me2 differed significantly between men and women (p = 0.01). ln(uAsCr) was positively associated with %H3K36me2 in men [β = 0.12; 95% confidence interval (CI): 0.01, 0.23, p = 0.03] but was negatively associated with %H3K36me2 in women (β = -0.05; 95% CI: -0.12, 0.02, p = 0.19). The patterns of associations with blood arsenic were similar. On average, water filter use was also associated with reductions in %H3K36me2 (p < 0.01), but this did not differ significantly by sex. Arsenic was not significantly associated with %H3K36me3 or %H3K79me2 in men or women. CONCLUSIONS Arsenic exposure was associated with %H3K36me2 in a sex-specific manner but was not associated with %H3K36me3 or %H3K79me2. Additional studies are needed to assess changes in %H3K36me2 after arsenic removal. CITATION Howe CG, Liu X, Hall MN, Slavkovich V, Ilievski V, Parvez F, Siddique AB, Shahriar H, Uddin MN, Islam T, Graziano JH, Costa M, Gamble MV. 2016. Associations between blood and urine arsenic concentrations and global levels of post-translational histone modifications in Bangladeshi men and women. Environ Health Perspect 124:1234-1240; http://dx.doi.org/10.1289/ehp.1510412.
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Affiliation(s)
| | | | - Megan N. Hall
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, USA
| | | | | | | | - Abu B. Siddique
- Columbia University Arsenic Project in Bangladesh, Dhaka, Bangladesh
| | - Hasan Shahriar
- Columbia University Arsenic Project in Bangladesh, Dhaka, Bangladesh
| | - Mohammad N. Uddin
- Columbia University Arsenic Project in Bangladesh, Dhaka, Bangladesh
| | - Tariqul Islam
- Columbia University Arsenic Project in Bangladesh, Dhaka, Bangladesh
| | | | - Max Costa
- Department of Environmental Medicine, Langone Medical Center, New York University, New York, New York, USA
| | - Mary V. Gamble
- Department of Environmental Health Sciences,
- Address correspondence to M.V. Gamble, Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, 11th Floor, 722 W. 168th St., New York, NY 10032 USA. Telephone: (212) 305-7949. E-mail:
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Wu J, Wen XW, Faulk C, Boehnke K, Zhang H, Dolinoy DC, Xi C. Perinatal Lead Exposure Alters Gut Microbiota Composition and Results in Sex-specific Bodyweight Increases in Adult Mice. Toxicol Sci 2016; 151:324-33. [PMID: 26962054 PMCID: PMC4880136 DOI: 10.1093/toxsci/kfw046] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Heavy metal pollution is a principle source of environmental contamination. Epidemiological and animal data suggest that early life lead (Pb) exposure results in critical effects on epigenetic gene regulation and child and adult weight trajectories. Using a mouse model of human-relevant exposure, we investigated the effects of perinatal Pb exposure on gut microbiota in adult mice, and the link between gut microbiota and bodyweight changes. Following Pb exposure during gestation and lactation via maternal drinking water, bodyweight in A(vy) strain wild-type non-agouti (a/a) offspring was tracked through adulthood. Gut microbiota of adult mice were characterized by deep DNA sequencing of bacterial 16S ribosomal RNA genes. Data analyses were stratified by sex and adjusted for litter effects. A Bayesian variable selection algorithm was used to analyze associations between bacterial operational taxonomic units and offspring adult bodyweight. Perinatal Pb exposure was associated with increased adult bodyweight in male (P < .05) but not in female offspring (P = .24). Cultivable aerobes decreased and anaerobes increased in Pb-exposed offspring (P < .005 and P < .05, respectively). Proportions of the 2 predominant phyla (Bacteroidetes and Firmicutes) shifted inversely with Pb exposure, and whole bacterial compositions were significantly different (analysis of molecular variance, P < .05) by Pb exposure without sex bias. In males, changes in gut microbiota were highly associated with adult bodyweight (P = .028; effect size = 2.59). Thus, perinatal Pb exposure results in altered adult gut microbiota regardless of sex, and these changes are highly correlated with increased bodyweight in males. Adult gut microbiota can be shaped by early exposures and may contribute to disease risks in a sex-specific manner.
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Affiliation(s)
- Jianfeng Wu
- *Department of Environmental Health Sciences
| | | | | | | | | | - Dana C Dolinoy
- *Department of Environmental Health Sciences Department of Nutritional Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan
| | - Chuanwu Xi
- *Department of Environmental Health Sciences
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Li Y, Xie C, Murphy SK, Skaar D, Nye M, Vidal AC, Cecil KM, Dietrich KN, Puga A, Jirtle RL, Hoyo C. Lead Exposure during Early Human Development and DNA Methylation of Imprinted Gene Regulatory Elements in Adulthood. ENVIRONMENTAL HEALTH PERSPECTIVES 2016; 124:666-73. [PMID: 26115033 PMCID: PMC4858407 DOI: 10.1289/ehp.1408577] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Accepted: 06/24/2015] [Indexed: 05/03/2023]
Abstract
BACKGROUND Lead exposure during early development causes neurodevelopmental disorders by unknown mechanisms. Epidemiologic studies have focused recently on determining associations between lead exposure and global DNA methylation; however, such approaches preclude the identification of loci that may alter human disease risk. OBJECTIVES The objective of this study was to determine whether maternal, postnatal, and early childhood lead exposure can alter the differentially methylated regions (DMRs) that control the monoallelic expression of imprinted genes involved in metabolism, growth, and development. METHODS Questionnaire data and serial blood lead levels were obtained from 105 participants (64 females, 41 males) of the Cincinnati Lead Study from birth to 78 months. When participants were adults, we used Sequenom EpiTYPER assays to test peripheral blood DNA to quantify CpG methylation in peripheral blood leukocytes at DMRs of 22 human imprinted genes. Statistical analyses were conducted using linear regression. RESULTS Mean blood lead concentration from birth to 78 months was associated with a significant decrease in PEG3 DMR methylation (β = -0.0014; 95% CI: -0.0023, -0.0005, p = 0.002), stronger in males (β = -0.0024; 95% CI: -0.0038, -0.0009, p = 0.003) than in females (β = -0.0009; 95% CI: -0.0020, 0.0003, p = 0.1). Elevated mean childhood blood lead concentration was also associated with a significant decrease in IGF2/H19 (β = -0.0013; 95% CI: -0.0023, -0.0003, p = 0.01) DMR methylation, but primarily in females, (β = -0.0017; 95% CI: -0.0029, -0.0006, p = 0.005) rather than in males, (β = -0.0004; 95% CI: -0.0023, 0.0015, p = 0.7). Elevated blood lead concentration during the neonatal period was associated with higher PLAGL1/HYMAI DMR methylation regardless of sex (β = 0.0075; 95% CI: 0.0018, 0.0132, p = 0.01). The magnitude of associations between cumulative lead exposure and CpG methylation remained unaltered from 30 to 78 months. CONCLUSIONS Our findings provide evidence that early childhood lead exposure results in sex-dependent and gene-specific DNA methylation differences in the DMRs of PEG3, IGF2/H19, and PLAGL1/HYMAI in adulthood. CITATION Li Y, Xie C, Murphy SK, Skaar D, Nye M, Vidal AC, Cecil KM, Dietrich KN, Puga A, Jirtle RL, Hoyo C. 2016. Lead exposure during early human development and DNA methylation of imprinted gene regulatory elements in adulthood. Environ Health Perspect 124:666-673; http://dx.doi.org/10.1289/ehp.1408577.
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Affiliation(s)
- Yue Li
- Department of Community and Family Medicine, and
- Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina, USA
| | - Changchun Xie
- Division of Epidemiology and Biostatistics, Department of Environmental Health, Center for Clinical and Translational Science and Training, University of Cincinnati (UC), Cincinnati, Ohio, USA
| | - Susan K. Murphy
- Department of Community and Family Medicine, and
- Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina, USA
| | - David Skaar
- Department of Biological Sciences, Center for Human Health and the Environment, North Carolina State University (NCSU), Raleigh, North Carolina, USA
| | - Monica Nye
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Adriana C. Vidal
- Department of Community and Family Medicine, and
- Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina, USA
| | - Kim M. Cecil
- Cincinnati Children’s Environmental Health Center, Cincinnati Children’s Hospital Medical Center, UC College of Medicine, Cincinnati, Ohio, USA
- Department of Radiology,
- Department of Pediatrics,
- Department of Environmental Health,
- Center for Environmental Genetics, and
| | - Kim N. Dietrich
- Division of Epidemiology and Biostatistics, UC College of Medicine, Cincinnati, Ohio, USA
| | - Alvaro Puga
- Department of Environmental Health,
- Center for Environmental Genetics, and
| | - Randy L. Jirtle
- Department of Biological Sciences, Center for Human Health and the Environment, North Carolina State University (NCSU), Raleigh, North Carolina, USA
- Department of Oncology, McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Department of Sport and Exercise Sciences, Institute of Sport and Physical Activity Research, University of Bedfordshire, Bedford, Bedfordshire, United Kingdom
- Address correspondence to C. Hoyo, Department of Biological Sciences, Center for Human Health and the Environment (CHHE), Program of Epidemiology and Environmental Epigenomics, North Carolina State University (NCSU), Raleigh, NC 27695-7633 USA. Telephone: (919) 515-0540. E-mail: , or R.L. Jirtle, Department of Biological Sciences, CHHE, NCSU, Raleigh, NC 27695-7633 USA. Telephone: (919) 399-3342. E-mail:
| | - Cathrine Hoyo
- Department of Community and Family Medicine, and
- Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina, USA
- Department of Biological Sciences, Center for Human Health and the Environment, North Carolina State University (NCSU), Raleigh, North Carolina, USA
- Address correspondence to C. Hoyo, Department of Biological Sciences, Center for Human Health and the Environment (CHHE), Program of Epidemiology and Environmental Epigenomics, North Carolina State University (NCSU), Raleigh, NC 27695-7633 USA. Telephone: (919) 515-0540. E-mail: , or R.L. Jirtle, Department of Biological Sciences, CHHE, NCSU, Raleigh, NC 27695-7633 USA. Telephone: (919) 399-3342. E-mail:
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Sen A, Cingolani P, Senut MC, Land S, Mercado-Garcia A, Tellez-Rojo MM, Baccarelli AA, Wright RO, Ruden DM. Lead exposure induces changes in 5-hydroxymethylcytosine clusters in CpG islands in human embryonic stem cells and umbilical cord blood. Epigenetics 2016; 10:607-21. [PMID: 26046694 DOI: 10.1080/15592294.2015.1050172] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Prenatal exposure to neurotoxicants such as lead (Pb) may cause stable changes in the DNA methylation (5mC) profile of the fetal genome. However, few studies have examined its effect on the DNA de-methylation pathway, specifically the dynamic changes of the 5-hydroxymethylcytosine (5hmC) profile. Therefore, in this study, we investigate the relationship between Pb exposure and 5mC and 5hmC modifications during early development. To study the changes in the 5hmC profile, we use a novel modification of the Infinium™ HumanMethylation450 assay (Illumina, Inc.), which we named HMeDIP-450K assay, in an in vitro human embryonic stem cell model of Pb exposure. We model Pb exposure-associated 5hmC changes as clusters of correlated, adjacent CpG sites, which are co-responding to Pb. We further extend our study to look at Pb-dependent changes in high density 5hmC regions in umbilical cord blood DNA from 48 mother-infant pairs from the Early Life Exposure in Mexico to Environmental Toxicants (ELEMENT) cohort. For our study, we randomly selected umbilical cord blood from 24 male and 24 female children from the 1st and 4th quartiles of Pb levels. Our data show that Pb-associated changes in the 5hmC and 5mC profiles can be divided into sex-dependent and sex-independent categories. Interestingly, differential 5mC sites are better markers of Pb-associated sex-dependent changes compared to differential 5hmC sites. In this study we identified several 5hmC and 5mC genomic loci, which we believe might have some potential as early biomarkers of prenatal Pb exposure.
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Key Words
- 5-hydroxymethylcytosine
- 5-methylcytosine
- A-clustering approach for grouping HM450K CpG sites into clusters based on correlations
- Aclust
- CpG island, CpG islands are usually in the promoter and 5' untranslated regions of genes
- CpG islands
- CpG, sites, CG dinucleotide methylation site in the genome corresponding with probes on HM450K
- DMRs, Differentially methylated regions (clusters) identified by GEE
- DhMRs, Differentially Hydroxymethylated regions (clusters) identified by GEE
- ELEMENT, Early Life Exposure in Mexico to Environmental Toxicants
- GEE, Generalized Estimating Equations, used to measure the estimated change in DNA methylation in co-regulated regions of the genome
- HM450K
- HM450K, Infinium Human Methylation 450K BeadChip array from Illumina
- HMeDIP-450K
- HMeDIP-450K, Infinium Human Methylation 450K BeadChip array from Illumina coupled with immunoprecipitation with 5hmC antibodies
- LINE-1, Long Interspersed Element 1, a common retrotransposon in humans
- MRs, Methylation regions (clusters) identified by A-clustering
- clusters
- hMRs, Hydroxymethylated regions (clusters) identified by A-clustering
- lead
- umbilical cord blood
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Affiliation(s)
- Arko Sen
- a Institute of Environmental Health Sciences; Wayne State University ; Detroit , MI , USA
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Nye MD, King KE, Darrah TH, Maguire R, Jima DD, Huang Z, Mendez MA, Fry RC, Jirtle RL, Murphy SK, Hoyo C. Maternal blood lead concentrations, DNA methylation of MEG3 DMR regulating the DLK1/MEG3 imprinted domain and early growth in a multiethnic cohort. ENVIRONMENTAL EPIGENETICS 2016; 2:dvv009. [PMID: 28123784 PMCID: PMC5258134 DOI: 10.1093/eep/dvv009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Prenatal exposure to lead (Pb) is known to decrease fetal growth; but its effects on postnatal growth and mechanistic insights linking Pb to growth are not clearly defined. Genomically imprinted genes are powerful regulators of growth and energy utilization, and may be particularly vulnerable to environmental Pb exposure. Because imprinting is established early and maintained via DNA methylation, we hypothesized that prenatal Pb exposure alters DNA methylation of imprinted genes resulting in lower birth weight and rapid growth. Pb was measured by inductively coupled plasma mass spectrometry (ICP-MS) in peripheral blood of 321 women of the Newborn Epigenetic STudy (NEST) obtained at gestation ~12 weeks. Linear and logistic regression models were used to evaluate associations between maternal Pb levels, methylation of differentially methylated regions (DMRs) regulating H19, MEG3, PEG3, and PLAGL1, measured by pyrosequencing, birth weight, and weight-for-height z score gains between birth and age 1yr, ages 1-2yrs, and 2-3yrs. Children born to women with Pb levels in the upper tertile had higher methylation of the regulatory region of the MEG3 DMR imprinted domain (β= 1.57, se= 0.82, p= 0.06). Pb levels were also associated with lower birth weight (β= -0.41, se= 0.15, p= 0.01) and rapid gains in adiposity (OR= 12.32, 95%CI=1.25-121.30, p= 0.03) by age 2-3 years. These data provide early human evidence for Pb associations with hypermethylation at the MEG3 DMR regulatory region and rapid adiposity gain-a risk factor for childhood obesity and cardiometabolic diseases in adulthood.
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Affiliation(s)
- Monica D. Nye
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Duke University, B226 LSRC, Box 91012, Research Drive, Durham, NC 27708, USA
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, 450 West Street, CB 7295, UNC, Chapel Hill, NC 27599, USA
- Department of Environmental Sciences and Engineering, Curriculum in Toxicology, The University of North Carolina at Chapel Hill, 135 Dauer Drive, CB 7431, UNC, Chapel Hill, NC 27599, USA
| | - Katherine E. King
- Environmental Public Health Division, U.S. Environmental Protection Agency and Department of Community and Family Medicine, Duke University, Durham, NC 27708, USA
| | - Thomas H. Darrah
- School of Earth Sciences, The Ohio State University, Columbus, OH 43210, USA
| | - Rachel Maguire
- Department of Biological Sciences, Center for Human Health and Environment, Campus Box 7633, NC State University, Raleigh, NC 27695, USA
| | - Dereje D. Jima
- Department of Biological Sciences, Center for Human Health and Environment, Campus Box 7633, NC State University, Raleigh, NC 27695, USA
| | - Zhiqing Huang
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Duke University, B226 LSRC, Box 91012, Research Drive, Durham, NC 27708, USA
| | - Michelle A. Mendez
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, 450 West Street, CB 7295, UNC, Chapel Hill, NC 27599, USA
- Department of Nutrition, Gillings School of Public Health Fellow, Carolina Population Center, University of North Carolina at Chapel Hill, 2101G McGavran-Greenberg Hall Chapel Hill, NC 27599-7461, USA
| | - Rebecca C. Fry
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, 450 West Street, CB 7295, UNC, Chapel Hill, NC 27599, USA
- Department of Environmental Sciences and Engineering, Curriculum in Toxicology, The University of North Carolina at Chapel Hill, 135 Dauer Drive, CB 7431, UNC, Chapel Hill, NC 27599, USA
| | - Randy L. Jirtle
- Department of Biological Sciences, Center for Human Health and Environment, Campus Box 7633, NC State University, Raleigh, NC 27695, USA
- Randy L. Jirtle,
http://orcid.org/0000-0003-1767-045X
| | - Susan K. Murphy
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Duke University, B226 LSRC, Box 91012, Research Drive, Durham, NC 27708, USA
- Susan K. Murphy,
http://orcid.org/0000-0001-8298-7272
| | - Cathrine Hoyo
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695, USA
- *Correspondence address. Department of Biological Sciences, Center for Human Health and Environment, Campus Box 7633, NC State University, Raleigh, NC 27695, USA. E-mail:
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72
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Blood lead level and its association with body mass index and obesity in China - Results from SPECT-China study. Sci Rep 2015; 5:18299. [PMID: 26658662 PMCID: PMC4677308 DOI: 10.1038/srep18299] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 11/16/2015] [Indexed: 02/07/2023] Open
Abstract
We aimed to report environmental and blood lead level (BLL) in China, and investigate the relationship of BLL with body mass index (BMI) and obesity. 5558 subjects were enrolled from 16 sites in China. BLL was measured by atomic absorption spectrometry. Obesity was defined as BMI ≥ 30 kg/m2. Median (interquartile range) of BLL was 44.00 μg/L (29.00–62.16) for men and 37.79 μg/L (25.13–54.35) for women, about twice higher than in U.S. population. Subjects in rural and high-economic-status areas had significantly greater BLL (P < 0.001). However, in these areas, the lead levels in drinking water, river water and rice were comparable to or significantly lower than those in urban and low-economic-status areas. After adjustment for age, urbanization, economic status and metabolic factors, BLL was independently associated with BMI in women (P for trend < 0.001), but not in men. In fully adjusted model, increased quartiles of BLL were associated with significantly increased odds ratios of obesity (P for trend < 0.01) in women. In conclusion, BLLs in Chinese adults were much higher than in developed countries. There was a sex-specific association between BLL and BMI. Elevated BLL does not appear to be associated with lead levels in drinking water or rice, suggesting some other exposure source.
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73
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Wojdacz TK. Biological and methodological aspects of assessment of locus specific de novo methylation in blood. Biomark Med 2015; 9:1291-9. [PMID: 26612587 DOI: 10.2217/bmm.15.83] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
AIM Locus-specific methylation in blood differs between individuals. As those changes may represent de novo methylation, induced by environmental factors, we aimed to evaluate the biological and methodological limitations of detection of methylation in blood. MATERIALS & METHODS We used Methylation-Sensitive High Resolution Melting to analyze methylation at 21 gene loci in peripheral blood DNA samples from 203 healthy women. RESULTS Overall nine of the screened loci displayed marked inter-individual variation in methylation frequency with methylation levels predominantly around 1%. The methylation of specific loci showed different association with age and reproducibility of detection. CONCLUSIONS Our results allowed benchmarking of both technological and biological limitations that need to be accounted for when evaluating locus specific methylation in blood as potential biomarker.
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Affiliation(s)
- Tomasz Kazimierz Wojdacz
- Institute of Environmental Medicine (Unit for Metals & Health), Karolinska Institutet, Nobels vag 13, Box210, 17177 Stockholm, Sweden
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74
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Salehi I, Karamian R, Komaki A, Tahmasebi L, Taheri M, Nazari M, Shahidi S, Sarihi A. Effects of vitamin E on lead-induced impairments in hippocampal synaptic plasticity. Brain Res 2015; 1629:270-81. [PMID: 26462654 DOI: 10.1016/j.brainres.2015.10.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 09/20/2015] [Accepted: 10/01/2015] [Indexed: 10/22/2022]
Abstract
Lead (Pb) exposure during development is associated with impaired cognitive function and long-term potentiation (LTP). Vitamin E (VE) is an antioxidant that could have protective effects against Pb intoxication. In this study, we examined the protective effects of vitamin E against Pb-induced LTP impairments. Forty-six adult male Wistar rats were randomly divided into 6 treatment groups: (1) control; (2) Pb exposure; (3) VE; (4) Pb +VE; (5) Pb exposure followed by VE 2 months after exposure; (6) VE followed by Pb exposure 1 month after treatment. Rats were exposed to Pb through daily consumption of Pb-contaminated distilled water; VE was administered by daily gavage for 3 months. After this period, the population spike (PS) amplitudes and the slopes of excitatory postsynaptic potentials (EPSPs) were measured in the dentate gyrus (DG) area of the hippocampus in adult rats in response to electrical stimulation applied to the perforant pathway in vivo. Blood samples were also collected to evaluate malondialdehyde (MDA) levels, total antioxidant capacity (TAC), and total oxidant status (TOS). Biochemical analyses demonstrated significant increases in plasma MDA and TOS levels in the Pb-exposed group compared to the control group. VE-protected groups revealed significant increases in TAC levels. Our results demonstrate that Pb decreased EPSP slopes and PS amplitudes compared to the control group, whereas VE increased these parameters compared to the control group. Co-administration of VE with Pb exposure inhibited Pb-induced effects. These findings suggest that VE via its antioxidant activity reverses Pb-induced impairments of synaptic plasticity in the DG.
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Affiliation(s)
- Iraj Salehi
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Ruhollah Karamian
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.
| | - Alireza Komaki
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.
| | - Lida Tahmasebi
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Masoumeh Taheri
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Masoumeh Nazari
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Siamak Shahidi
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Abdolrahman Sarihi
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
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75
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Sen A, Heredia N, Senut MC, Hess M, Land S, Qu W, Hollacher K, Dereski MO, Ruden DM. Early life lead exposure causes gender-specific changes in the DNA methylation profile of DNA extracted from dried blood spots. Epigenomics 2015; 7:379-93. [PMID: 26077427 DOI: 10.2217/epi.15.2] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
AIMS In this paper, we tested the hypothesis that early life lead (Pb) exposure associated DNA methylation (5 mC) changes are dependent on the sex of the child and can serve as biomarkers for Pb exposure. METHODS In this pilot study, we measured the 5mC profiles of DNA extracted from dried blood spots (DBS) in a cohort of 43 children (25 males and 18 females; ages from 3 months to 5 years) from Detroit. Result & Discussion: We found that the effect of Pb-exposure on the 5-mC profiles can be separated into three subtypes: affected methylation loci which are conserved irrespective of the sex of the child (conserved); affected methylation loci unique to males (male-specific); and affected methylation loci unique to females (female-specific).
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Affiliation(s)
- Arko Sen
- Institute of Environmental Health Sciences, Wayne State University, 2727 Second Avenue, Detroit, MI 48201, USA.,Department of Pharmacology, Wayne State University, Room 4000, 2727 Second Avenue, Detroit, MI 48201, USA
| | - Nicole Heredia
- Department of Obstetrics & Gynecology, Wayne State University, 3750 Woodward Avenue, Detroit, MI 48201, USA
| | - Marie-Claude Senut
- Institute of Environmental Health Sciences, Wayne State University, 2727 Second Avenue, Detroit, MI 48201, USA
| | - Matthew Hess
- Department of Obstetrics & Gynecology, Wayne State University, 3750 Woodward Avenue, Detroit, MI 48201, USA.,CS Mott Center for Human Growth & Development, Wayne State University, 275 E Hancock St, Detroit, MI 48201, USA
| | - Susan Land
- Department of Obstetrics & Gynecology, Wayne State University, 3750 Woodward Avenue, Detroit, MI 48201, USA
| | - Wen Qu
- Department of Pharmacology, Wayne State University, Room 4000, 2727 Second Avenue, Detroit, MI 48201, USA
| | | | - Mary O Dereski
- Department of Obstetrics & Gynecology, Wayne State University, 3750 Woodward Avenue, Detroit, MI 48201, USA
| | - Douglas M Ruden
- Institute of Environmental Health Sciences, Wayne State University, 2727 Second Avenue, Detroit, MI 48201, USA.,Union College, 807 Union St, Schenectady, NY 12308, USA
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76
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Tyler CR, Hafez AK, Solomon ER, Allan AM. Developmental exposure to 50 parts-per-billion arsenic influences histone modifications and associated epigenetic machinery in a region- and sex-specific manner in the adult mouse brain. Toxicol Appl Pharmacol 2015; 288:40-51. [PMID: 26193056 DOI: 10.1016/j.taap.2015.07.013] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 07/13/2015] [Accepted: 07/16/2015] [Indexed: 01/07/2023]
Abstract
Epidemiological studies report that arsenic exposure via drinking water adversely impacts cognitive development in children and, in adults, can lead to greater psychiatric disease susceptibility, among other conditions. While it is known that arsenic toxicity has a profound effect on the epigenetic landscape, very few studies have investigated its effects on chromatin architecture in the brain. We have previously demonstrated that exposure to a low level of arsenic (50ppb) during all three trimesters of fetal/neonatal development induces deficits in adult hippocampal neurogenesis in the dentate gyrus (DG), depressive-like symptoms, and alterations in gene expression in the adult mouse brain. As epigenetic processes control these outcomes, here we assess the impact of our developmental arsenic exposure (DAE) paradigm on global histone posttranslational modifications and associated chromatin-modifying proteins in the dentate gyrus and frontal cortex (FC) of adult male and female mice. DAE influenced histone 3K4 trimethylation with increased levels in the male DG and FC and decreased levels in the female DG (no change in female FC). The histone methyltransferase MLL exhibited a similar sex- and region-specific expression profile as H3K4me3 levels, while histone demethylase KDM5B expression trended in the opposite direction. DAE increased histone 3K9 acetylation levels in the male DG along with histone acetyltransferase (HAT) expression of GCN5 and decreased H3K9ac levels in the male FC along with decreased HAT expression of GCN5 and PCAF. DAE decreased expression of histone deacetylase enzymes HDAC1 and HDAC2, which were concurrent with increased H3K9ac levels but only in the female DG. Levels of H3 and H3K9me3 were not influenced by DAE in either brain region of either sex. These findings suggest that exposure to a low, environmentally relevant level of arsenic during development leads to long-lasting changes in histone methylation and acetylation in the adult brain due to aberrant expression of epigenetic machinery based on region and sex.
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Affiliation(s)
- Christina R Tyler
- Department of Neurosciences, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA
| | - Alexander K Hafez
- Department of Neurosciences, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA
| | - Elizabeth R Solomon
- Department of Neurosciences, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA
| | - Andrea M Allan
- Department of Neurosciences, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA.
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77
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Goodrich JM, Sánchez BN, Dolinoy DC, Zhang Z, Hernández-Ávila M, Hu H, Peterson KE, Téllez-Rojo MM. Quality control and statistical modeling for environmental epigenetics: a study on in utero lead exposure and DNA methylation at birth. Epigenetics 2015; 10:19-30. [PMID: 25580720 DOI: 10.4161/15592294.2014.989077] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
DNA methylation data assayed using pyrosequencing techniques are increasingly being used in human cohort studies to investigate associations between epigenetic modifications at candidate genes and exposures to environmental toxicants and to examine environmentally-induced epigenetic alterations as a mechanism underlying observed toxicant-health outcome associations. For instance, in utero lead (Pb) exposure is a neurodevelopmental toxicant of global concern that has also been linked to altered growth in human epidemiological cohorts; a potential mechanism of this association is through alteration of DNA methylation (e.g., at growth-related genes). However, because the associations between toxicants and DNA methylation might be weak, using appropriate quality control and statistical methods is important to increase reliability and power of such studies. Using a simulation study, we compared potential approaches to estimate toxicant-DNA methylation associations that varied by how methylation data were analyzed (repeated measures vs. averaging all CpG sites) and by method to adjust for batch effects (batch controls vs. random effects). We demonstrate that correcting for batch effects using plate controls yields unbiased associations, and that explicitly modeling the CpG site-specific variances and correlations among CpG sites increases statistical power. Using the recommended approaches, we examined the association between DNA methylation (in LINE-1 and growth related genes IGF2, H19 and HSD11B2) and 3 biomarkers of Pb exposure (Pb concentrations in umbilical cord blood, maternal tibia, and maternal patella), among mother-infant pairs of the Early Life Exposures in Mexico to Environmental Toxicants (ELEMENT) cohort (n = 247). Those with 10 μg/g higher patella Pb had, on average, 0.61% higher IGF2 methylation (P = 0.05). Sex-specific trends between Pb and DNA methylation (P < 0.1) were observed among girls including a 0.23% increase in HSD11B2 methylation with 10 μg/g higher patella Pb.
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Key Words
- ANOVA, analysis of variance
- DMR, differentially methylated region
- DNA methylation
- ELEMENT, early life exposures in Mexico to environmental toxicants
- GEE, generalized estimating equation
- GLM, general linear model
- H19, H19, imprinted maternally expressed transcript (non-protein coding)
- HSD11B2, hydroxysteroid (11-β) dehydrogenase 2
- IGF2, insulin-like growth factor 2
- K-XRF, K X-ray fluorescence
- LINE-1, long interspersed element-1
- OLS, ordinary linear regression
- PCR, polymerase chain reaction
- Pb, lead
- environmental exposure
- lead
- pyrosequencing
- quality control
- statistical methods
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Affiliation(s)
- Jaclyn M Goodrich
- a Department of Environmental Health Sciences ; University of Michigan School of Public Health ; Ann Arbor , MI USA
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78
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Sánchez-Martín FJ, Lindquist DM, Landero-Figueroa J, Zhang X, Chen J, Cecil KM, Medvedovic M, Puga A. Sex- and tissue-specific methylome changes in brains of mice perinatally exposed to lead. Neurotoxicology 2014; 46:92-100. [PMID: 25530354 DOI: 10.1016/j.neuro.2014.12.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 12/09/2014] [Accepted: 12/10/2014] [Indexed: 11/29/2022]
Abstract
Changes in DNA methylation and subsequent changes in gene expression regulation are the hallmarks of age- and tissue-dependent epigenetic drift and plasticity resulting from the combinatorial integration of genetic determinants and environmental cues. To determine whether perinatal lead exposure caused persistent DNA methylation changes in target tissues, we exposed mouse dams to 0, 3 or 30 ppm of lead acetate in drinking water for a period extending from 2 months prior to mating, through gestation, until weaning of pups at postnatal day-21, and analyzed whole-genome DNA methylation in brain cortex and hippocampus of 2-month old exposed and unexposed progeny. Lead exposure resulted in hypermethylation of three differentially methylated regions in the hippocampus of females, but not males. These regions mapped to Rn4.5s, Sfi1, and Rn45s loci in mouse chromosomes 2, 11 and 17, respectively. At a conservative fdr<0.001, 1623 additional CpG sites were differentially methylated in female hippocampus, corresponding to 117 unique genes. Sixty of these genes were tested for mRNA expression and showed a trend toward negative correlation between mRNA expression and methylation in exposed females but not males. No statistically significant methylome changes were detected in male hippocampus or in cortex of either sex. We conclude that exposure to lead during embryonic life, a time when the organism is most sensitive to environmental cues, appears to have a sex- and tissue-specific effect on DNA methylation that may produce pathological or physiological deviations from the epigenetic plasticity operative in unexposed mice.
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Affiliation(s)
- Francisco Javier Sánchez-Martín
- Department of Environmental Health and Center for Environmental Genetics, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Diana M Lindquist
- Imaging Research Center, Department of Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Julio Landero-Figueroa
- Metallomics Center of the Americas, Department of Chemistry, University of Cincinnati, Cincinnati, OH 45219, USA
| | - Xiang Zhang
- Department of Environmental Health and Center for Environmental Genetics, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Jing Chen
- Department of Environmental Health and Center for Environmental Genetics, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Kim M Cecil
- Imaging Research Center, Department of Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Mario Medvedovic
- Department of Environmental Health and Center for Environmental Genetics, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Alvaro Puga
- Department of Environmental Health and Center for Environmental Genetics, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
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Vaiserman A. Early-life Exposure to Endocrine Disrupting Chemicals and Later-life Health Outcomes: An Epigenetic Bridge? Aging Dis 2014; 5:419-29. [PMID: 25489493 DOI: 10.14336/ad.2014.0500419] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 01/22/2014] [Accepted: 01/23/2014] [Indexed: 12/11/2022] Open
Abstract
A growing body of evidence demonstrates that adverse events early in development, and particularly during intrauterine life, may program risks for diseases in adult life. Increasing evidence has been accumulated indicating the important role of epigenetic regulation including DNA methylation, histone modifications and miRNAs in developmental programming. Among the environmental factors which play an important role in programming of chronic pathologies, the endocrine-disrupting chemicals (EDCs) that have estrogenic, anti-estrogenic, and anti-androgenic activity are of specific concern because the developing organism is extremely sensitive to perturbation by substances with hormone-like activity. Among EDCs, there are many substances that are constantly present in the modern human environment or are in widespread use, including dioxin and dioxin-like compounds, phthalates, agricultural pesticides, polychlorinated biphenyls, industrial solvents, pharmaceuticals, and heavy metals. Apart from their common endocrine active properties, several EDCs have been shown to disrupt developmental epigenomic programming. The purpose of this review is to provide a summary of recent research findings which indicate that exposure to EDCs during in-utero and/or neonatal development can cause long-term health outcomes via mechanisms of epigenetic memory.
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80
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Faulk C, Barks A, Sánchez BN, Zhang Z, Anderson OS, Peterson KE, Dolinoy DC. Perinatal lead (Pb) exposure results in sex-specific effects on food intake, fat, weight, and insulin response across the murine life-course. PLoS One 2014; 9:e104273. [PMID: 25105421 PMCID: PMC4126699 DOI: 10.1371/journal.pone.0104273] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 06/29/2014] [Indexed: 12/03/2022] Open
Abstract
Developmental lead (Pb) exposure has been associated with lower body weight in human infants and late onset obesity in mice. We determined the association of perinatal Pb exposure in mice with changes in obesity-related phenotypes into adulthood. Mice underwent exposure via maternal drinking water supplemented with 0 (control), 2.1 (low), 16 (medium), or 32 (high) ppm Pb-acetate two weeks prior to mating through lactation. Offspring were phenotyped at ages 3, 6, and 9 months for energy expenditure, spontaneous activity, food intake, body weight, body composition, and at age 10 months for glucose tolerance. Data analyses were stratified by sex and adjusted for litter effects. Exposed females and males exhibited increased energy expenditure as compared to controls (p<0.0001 for both). In females, horizontal activity differed significantly from controls (p = 0.02) over the life-course. Overall, food intake increased in exposed females and males (p<0.0008 and p<0.0001, respectively) with significant linear trends at 9 months in females (p = 0.01) and 6 months in males (p<0.01). Body weight was significantly increased in males at the medium and high exposures (p = 0.001 and p = 0.006). Total body fat differed among exposed females and males (p<0.0001 and p<0.0001, respectively). Insulin response was significantly increased in medium exposure males (p<0.05). Perinatal Pb exposure at blood lead levels between 4.1 µg/dL and 32 µg/dL is associated with increased food intake, body weight, total body fat, energy expenditure, activity, and insulin response in mice. Physiological effects of developmental Pb exposure persist and vary according to sex and age.
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Affiliation(s)
- Christopher Faulk
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan, United States of America
| | - Amanda Barks
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan, United States of America
| | - Brisa N. Sánchez
- Department of Biostatistics, University of Michigan School of Public Health, Ann Arbor, Michigan, United States of America
| | - Zhenzhen Zhang
- Department of Biostatistics, University of Michigan School of Public Health, Ann Arbor, Michigan, United States of America
| | - Olivia S. Anderson
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan, United States of America
| | - Karen E. Peterson
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan, United States of America
- Center for Human Growth and Development, University of Michigan, Ann Arbor, Michigan, United States of America
- Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts, United States of America
| | - Dana C. Dolinoy
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan, United States of America
- * E-mail:
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81
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Davies W. Sex differences in attention Deficit Hyperactivity Disorder: candidate genetic and endocrine mechanisms. Front Neuroendocrinol 2014; 35:331-46. [PMID: 24680800 DOI: 10.1016/j.yfrne.2014.03.003] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 02/13/2014] [Accepted: 03/17/2014] [Indexed: 02/07/2023]
Abstract
Attention Deficit Hyperactivity Disorder (ADHD) is a developmental condition characterised by severe inattention, pathological impulsivity and hyperactivity; it is relatively common affecting up to 6% of children, and is associated with a risk of long-term adverse educational and social consequences. Males are considerably more likely to be diagnosed with ADHD than females; the course of the disorder and its associated co-morbidities also appear to be sensitive to sex. Here, I discuss fundamental biological (genetic and endocrine) mechanisms that have been shown to, or could theoretically, contribute towards these sexually dimorphic phenomena. Greater understanding of how and why the sexes differ with respect to ADHD vulnerability should allow us to identify and characterise novel protective and risk factors for the disorder, and should ultimately facilitate improved diagnosis, prognosis and treatment.
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Affiliation(s)
- William Davies
- Behavioural Genetics Group, Neuroscience and Mental Health Research Institute, Schools of Psychology and Medicine, Cardiff University, Tower Building, Park Place, Cardiff CF10 3AT, UK; Medical Research Council Centre for Neuropsychiatric Genetics and Genomics, Cardiff University, Hadyn Ellis Building, Cardiff CF24 4HQ, UK.
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82
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Faulk C, Liu K, Barks A, Goodrich JM, Dolinoy DC. Longitudinal epigenetic drift in mice perinatally exposed to lead. Epigenetics 2014; 9:934-41. [PMID: 24786859 DOI: 10.4161/epi.29024] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
An understanding of the natural change in DNA methylation over time, defined as "epigenetic drift," will inform the study of environmental effects on the epigenome. This study investigates epigenetic drift in isogenic mice exposed perinatally to lead (Pb) acetate at four concentrations, 0 ppm (control), 2.1 ppm (low), 16 ppm (medium), and 32 ppm (high) prior to conception through weaning, then followed until 10 months of age. Absolute values of DNA methylation in a transposon-associated metastable locus, Cdk5-activator binding protein (Cabp(IAP)), and three imprinted loci (Igf2, Igf2r, and H19) were obtained from tail tissue in paired samples. DNA methylation levels in the controls increased over time at the imprinted Igf2 and Igf2r loci (both P = 0.0001), but not at the imprinted H19 locus or the Cabp(IAP) metastable epiallele. Pb exposure was associated with accelerated DNA hypermethylation in Cabp(IAP) (P = 0.0209) and moderated hypermethylation in Igf2r (P = 0.0447), and with marginally accelerated hypermethylation at H19 (P = 0.0847). In summary, the presence and magnitude of epigenetic drift was locus-dependent, and enhancement of drift was mediated by perinatal Pb exposure, in some, but not all, loci.
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Affiliation(s)
- Christopher Faulk
- Department of Environmental Health Sciences; University of Michigan; Ann Arbor, MI USA
| | - Kevin Liu
- Department of Environmental Health Sciences; University of Michigan; Ann Arbor, MI USA
| | - Amanda Barks
- Department of Environmental Health Sciences; University of Michigan; Ann Arbor, MI USA
| | - Jaclyn M Goodrich
- Department of Environmental Health Sciences; University of Michigan; Ann Arbor, MI USA
| | - Dana C Dolinoy
- Department of Environmental Health Sciences; University of Michigan; Ann Arbor, MI USA
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83
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Gacias M, Casaccia P. EPIGENETIC MECHANISMS IN MULTIPLE SCLEROSIS. REVISTA ESPANOLA DE ESCLEROSIS MULTIPLE 2014; 6:25-35. [PMID: 30147811 PMCID: PMC6107087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The interplay between genetic factors and cell-specific epigenetic changes may be highly relevant in development of multiple sclerosis (MS). Environmental risk factors for MS are able to modify the epigenome, constituting a link between environment exposure and changes in gene expression. In this review we discuss the most relevant epigenetic findings described in different tissues from MS patients and the future application of epigenetic advances in MS field.
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Affiliation(s)
- Mar Gacias
- Department of Neuroscience, Friedman Brain Institute at Mount Sinai
| | - Patrizia Casaccia
- Department of Neuroscience, Friedman Brain Institute at Mount Sinai
- Department of Genetics and MultiScale Biology, Department of Neurology Icahn School of Medicine at Mount Sinai
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