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Yang CF, Karmaus WJJ, Yang CC, Chen ML, Wang IJ. Bisphenol a Exposure, DNA Methylation, and Asthma in Children. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17010298. [PMID: 31906378 PMCID: PMC6981376 DOI: 10.3390/ijerph17010298] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Revised: 12/16/2019] [Accepted: 12/19/2019] [Indexed: 12/29/2022]
Abstract
Epidemiological studies have reported the relationship between bisphenol A (BPA) exposure and increased prevalence of asthma, but the mechanisms remain unclear. Here, we investigated whether BPA exposure and DNA methylation related to asthma in children. We collected urinary and blood samples from 228 children (Childhood Environment and Allergic Diseases Study cohort) aged 3 years. Thirty-three candidate genes potentially interacting with BPA exposure were selected from a toxicogenomics database. DNA methylation was measured in 22 blood samples with top-high and bottom-low exposures of BPA. Candidate genes with differential methylation levels were validated by qPCR and promoter associated CpG islands have been investigated. Correlations between the methylation percentage and BPA exposure and asthma were analyzed. According to our findings, MAPK1 showed differential methylation and was further investigated in 228 children. Adjusting for confounders, urinary BPA glucuronide (BPAG) level inversely correlated with MAPK1 promoter methylation (β = -0.539, p = 0.010). For the logistic regression analysis, MAPK1 methylation status was dichotomized into higher methylated and lower methylated groups with cut off continuous variable of median of promoter methylation percentage (50%) while performing the analysis. MAPK1 methylation was lower in children with asthma than in children without asthma (mean ± SD; 69.82 ± 5.88% vs. 79.82 ± 5.56%) (p = 0.001). Mediation analysis suggested that MAPK1 methylation acts as a mediation variable between BPA exposure and asthma. The mechanism of BPA exposure on childhood asthma might, therefore, be through the alteration of MAPK1 methylation. The mechanism of BPA exposure on childhood asthma might, therefore, be through the alteration of MAPK1 methylation.
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Affiliation(s)
- Chia-Feng Yang
- Department of Pediatrics, Taipei Veterans General Hospital, Taipei 112, Taiwan;
- Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, Taipei 112, Taiwan; (C.-C.Y.); (M.-L.C.)
| | - Wilfried J. J. Karmaus
- Division of Epidemiology, Biostatistics, and Environmental Health, School of Public Health, University of Memphis, Memphis, TN 38152, USA;
| | - Chen-Chang Yang
- Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, Taipei 112, Taiwan; (C.-C.Y.); (M.-L.C.)
| | - Mei-Lien Chen
- Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, Taipei 112, Taiwan; (C.-C.Y.); (M.-L.C.)
| | - I-Jen Wang
- Department of Pediatrics, Taipei Hospital, Ministry of Health and Welfare, Taipei 242, Taiwan
- School of Medicine, National Yang-Ming University, Taipei 112, Taiwan
- College of Public Health, China Medical University, Taichung 400-439, Taiwan
- National Institutes of Environmental Health Sciences, National Health Research Institutes, Miaoli 35053,Taiwan
- Correspondence: ; Tel.: +886-2-2276-5566 (ext. 2532); Fax: +886-2-2998-8028
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Lin TJ, Karmaus WJJ, Chen ML, Hsu JC, Wang IJ. Interactions Between Bisphenol A Exposure and GSTP1 Polymorphisms in Childhood Asthma. ALLERGY, ASTHMA & IMMUNOLOGY RESEARCH 2018; 10:172-179. [PMID: 29411558 PMCID: PMC5809766 DOI: 10.4168/aair.2018.10.2.172] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 12/20/2017] [Accepted: 12/31/2017] [Indexed: 12/25/2022]
Abstract
Purpose Bisphenol A (BPA) exposure may increase the risk of asthma. Genetic polymorphisms of oxidative stress-related genes, glutathione S-transferases (GSTM1, GSTP1), manganese superoxide dismutase, catalase, myeloperoxidase, and microsomal epoxide hydrolase may be related to BPA exposure. The aim is to evaluate whether oxidative stress genes modulates associations of BPA exposure with asthma. Methods We conducted a case-control study comprised of 126 asthmatic children and 327 controls. Urine Bisphenol A glucuronide (BPAG) levels were measured by ultra-performance liquid chromatography/tandem mass spectrometry, and genetic variants were analyzed by a TaqMan assay. Information on asthma and environmental exposure was collected. Analyses of variance and logistic regressions were performed to determine the association of genotypes and urine BPAG levels with asthma. Results BPAG levels were significantly associated with asthma (adjusted odds ratio [aOR], 1.29 per log unit increase in concentration; 95% confidence interval [CI], 1.081.55). Compared to the GG genotype, children with a GSTP1 AA genotype had higher urine BPAG concentrations (geometric mean [standard error], 12.72 [4.16] vs 11.42 [2.82]; P=0.036). In children with high BPAG, the GSTP1 AA genotype was related to a higher odds of asthma than the GG genotype (aOR, 4.84; 95% CI, 1.0223.06). Conclusions GSTP1 variants are associated with urine BPA metabolite levels. Oxidative stress genes may modulate the effect of BPA exposure on asthma.
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Affiliation(s)
- Tien Jen Lin
- Department of Neurosurgery, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,Graduate Institute of Sports Science, College of Exercise and Health Sciences, National Taiwan Sport University, Taoyuan City, Taiwan.,Graduate Institute of Injury Prevention and Control, Taipei Medical University, Taipei, Taiwan
| | - Wilfried J J Karmaus
- Division of Epidemiology, Biostatistics, and Environmental Health, School of Public Health, University of Memphis, Memphis, TN, USA
| | - Mei Lien Chen
- Institute of Environmental and Occupational Health Sciences, National Yang Ming University, Taipei, Taiwan
| | - Jiin Chyr Hsu
- Department of Internal Medicine, Taipei Hospital, Ministry of Health and Welfare, Taipei, Taiwan
| | - I Jen Wang
- Department of Pediatrics, Taipei Hospital, Ministry of Health and Welfare, Taipei, Taiwan.,School of Medicine, National Yang Ming University, Taipei, Taiwan.,College of Public Health, China Medical University, Taichung, Taiwan.
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Wang IJ, Karmaus WJJ, Yang CC. Lead exposure, IgE, and the risk of asthma in children. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2017; 27:478-483. [PMID: 28401896 DOI: 10.1038/jes.2017.5] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 02/20/2017] [Indexed: 05/02/2023]
Abstract
Lead (Pb) has adverse effects on our nervous system and renal systems. Young children are more vulnerable to Pb exposure. However, the role of low-level Pb exposure in the immune system and allergic diseases in children is not well established. The aims of this study are to investigate the associations between Pb exposure and allergic diseases; between Pb and immunoglobulin E (IgE) as an intervening variable; and gender-based differences. We used multistage stratified random sampling to recruit kindergarten children nationwide in Taiwan. Information about allergic diseases and environmental exposures was collected by questionnaire. We compared children with and without allergic diseases for blood Pb levels measured by inductively coupled plasma mass spectrometry. The association between blood Pb and allergic diseases was assessed by logistic regression and those between Pb and IgE by generalized linear models. We also conducted mediation analysis to evaluate how much risk of allergic diseases related to Pb exposure is explained by IgE. A total of 930 children completed specimen collections. There was a positive association between Pb and asthma. Blood Pb were also positively linked with serum IgE (β=0.26 kU/l per ln-unit increase Pb concentration; 95% CI 0.009-0.50 kU/l), after adjusting for potential confounders. Analyses stratified by gender revealed that blood Pb correlated with IgE only in boys (β=0.40 kU/l; 95% CI 0.03-0.76 kU/l). We estimated that 38% of the total effect of Pb exposure on asthma is mediated by IgE levels. In conclusion, Pb exposure is associated with both blood IgE and asthma in boys. Moreover, the effect of Pb exposure on asthma may be mediated by IgE levels.
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Affiliation(s)
- I-Jen Wang
- Department of Pediatrics, Taipei Hospital, Ministry of Health and Welfare, Taipei, Taiwan
- Institute of Environmental and Occupational Health Sciences, School of Medicine, National Yang-Ming University, Taipei, Taiwan
- Department of Health Risk Management, China Medical University, Taichung, Taiwan
| | - Wilfried J J Karmaus
- Division of Epidemiology, Biostatistics, and Environmental Health, School of Public Health, University of Memphis, Memphis, Tennessee, USA
| | - Chen-Chang Yang
- Institute of Environmental and Occupational Health Sciences, School of Medicine, National Yang-Ming University, Taipei, Taiwan
- Division of Clinical Toxicology &Occupational Medicine, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
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Wang IJ, Karmaus WJJ, Yang CC. Polycyclic aromatic hydrocarbons exposure, oxidative stress, and asthma in children. Int Arch Occup Environ Health 2017; 90:297-303. [PMID: 28175985 DOI: 10.1007/s00420-017-1198-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 01/09/2017] [Indexed: 12/29/2022]
Abstract
PURPOSE Polycyclic aromatic hydrocarbons (PAHs) are known for their carcinogenic and teratogenic properties. However, little is known about the effect of PAH on our immune and respiratory systems. Hence, we investigated associations (1) between PAH exposure and IgE levels and asthma in children and (2) between PAH exposure and the oxidative stress marker 8OHdG potentially involved in disease pathogenesis stratifying by (3) sex-based differences. METHODS A total of 453 kindergarten children were recruited and provided samples. Urine biomarker of PAH exposure (1-OHP levels) was measured by UPLC-MS/MS and a marker of oxidative stress (8OHdG) was measured by ELISA. Serum IgE were assessed and information on asthma was collected. Associations between 1-OHP levels, 8OHdG, IgE and asthma were analyzed by multivariate linear and logistic regression. A mediation analysis was conducted to evaluate whether the risk of increased IgE and asthma related to PAH exposure is explained by 8OHdG changes. RESULTS Urine 1-OHP levels were positively related to 8OHdG levels (per ln-unit: β = 0.30kU/l, p = 0.002). Similar results were also found for 1-OHP levels with IgE levels (per ln-unit: β = 0.27 kU/l, p = 0.027). 1-OHP levels (per ln-unit) were significantly associated with asthma, with an OR (95% CI) of 1.42 (1.18-1.70). In addition, 1-OHP levels were associated with asthma. It is estimated that 35% of the effect of PAH exposure on asthma is mediated by 8OHdG levels. CONCLUSION Exposure to PAH may enhance oxidative stress and may induce asthma. The effect of PAH exposure on asthma may be mediated by oxidative stress.
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Affiliation(s)
- I-Jen Wang
- Department of Pediatrics, Taipei Hospital, Ministry of Health and Welfare, Taipei, Taiwan, Republic of China. .,Institute of Environmental and Occupational Health Sciences, School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China. .,Department of Health Risk Management, China Medical University, Taichung, Taiwan, Republic of China.
| | - Wilfried J J Karmaus
- Division of Epidemiology, Biostatistics, and Environmental Health, School of Public Health, University of Memphis, Memphis, USA
| | - Chen-Chang Yang
- Institute of Environmental and Occupational Health Sciences, School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.,Division of Clinical Toxicology and Occupational Medicine, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China
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Mediterranean diet and childhood asthma. Allergol Immunopathol (Madr) 2016; 44:99-105. [PMID: 26278484 DOI: 10.1016/j.aller.2015.04.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 04/01/2015] [Accepted: 04/02/2015] [Indexed: 12/19/2022]
Abstract
BACKGROUND The incidence of bronchial hyperreactivity has increased to one-third of the population in developed countries, which requires the adoption of preventive and therapeutic measures. The objective of the present study was to assess the effects of a traditional Mediterranean diet on patients diagnosed with childhood asthma and determine if there is a beneficial effect from this dietary intervention. METHODS Prospective before-after comparison study of 50 girls and 54 boys aged 1-5 years, who were enrolled in the 1-year programme "Learning to Eat from the Mediterranean", designed to promote the adoption of a traditional Mediterranean diet. We studied the clinical and therapeutic variables and anthropometric measurements. RESULTS All studied symptomatic indicators (number and intensity of asthmatic attack, infections and hospital admissions) showed a positive and statistically significant evolution of bronchial hyperreactivity from the first weeks of the intervention onwards. Throughout the treatment, 32.2% of patients remained free of crisis, 35.3% of the patients only had one attack throughout the year and 24.9% had two episodes, compared to 4.73 episodes on average in the previous year. The use of inhaled corticosteroids markedly decreased from 3.92 ± 1.61 to 1.11 ± 1.09 times per patient per year (P<0.001) and that of inhaled bronchodilators decreased from 4.14 ± 1.61 to 1.12 ± 1.40 (P<0.001). As a result, the families involved in the programme reported a high level of satisfaction. CONCLUSIONS The adoption of a traditional Mediterranean diet could contribute significantly to the improvement of patients diagnosed with childhood asthma.
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Wang IJ, Karmaus WJ, Chen SL, Holloway JW, Ewart S. Effects of phthalate exposure on asthma may be mediated through alterations in DNA methylation. Clin Epigenetics 2015; 7:27. [PMID: 25960783 PMCID: PMC4424541 DOI: 10.1186/s13148-015-0060-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 02/17/2015] [Indexed: 01/01/2023] Open
Abstract
Background Phthalates may increase the asthma risk in children. Mechanisms underlying this association remain to be addressed. This study assesses the effect of phthalate exposures on epigenetic changes and the role of epigenetic changes for asthma. In the first step, urine and blood samples from 256 children of the Childhood Environment and Allergic diseases Study (CEAS) were analyzed. Urine 5OH-MEHP levels were quantified as an indicator of exposure, and asthma information was collected. DNA methylation (DNA-M) was measured by quantitative PCR. In the screening part of step 1, DNA-M of 21 potential human candidate genes suggested by a toxicogenomic data were investigated in 22 blood samples. Then, in the testing part of step 1, positively screened genes were tested in a larger sample of 256 children and then validated by protein measurements. In step 2, we replicated the association between phthalate exposure and gene-specific DNA-M in 54 children in the phthalate contaminated food event. In step 3, the risk of DNA-M for asthma was tested in 256 children from CEAS and corroborated in 270 children from the Isle of Wight (IOW) birth cohort. Results Differential methylation in three genes (AR, TNFα, and IL-4) was identified through screening. Testing in 256 children showed that methylation of the TNFα gene promoter was lower when children had higher urine 5OH-MEHP values (β = −0.138, P = 0.040). Functional validation revealed that TNFα methylation was inversely correlated with TNFα protein levels (β = −0.18, P = 0.041). In an additional sample of 54 children, we corroborated that methylation of the TNFα gene promoter was lower when urine 5OH-MEHP concentrations were higher. Finally, we found that a lower methylation of 5′CGI region of TNFα was associated with asthma in 256 CEAS children (OR = 2.15, 95% CI = 1.01 to 4.62). We replicated this in 270 children from the IOW birth cohort study. Methylation of the CpG site cg10717214 was negatively associated with asthma, when children had ‘AA’ or ‘AG’ genotype of the TNFα single nucleotide rs1800610. Conclusions Effects of phthalate exposure on asthma may be mediated through alterations in DNA methylation. Electronic supplementary material The online version of this article (doi:10.1186/s13148-015-0060-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- I-Jen Wang
- Department of Pediatrics, Taipei Hospital, Ministry of Health and Welfare, #127, Su-Yuan Road, Hsin-Chuang Dist 242 New Taipei City, Taiwan ; Institute of Environmental and Occupational Health Sciences, College of Medicine, National Yang-Ming University, Taipei, 112 Taiwan ; Department of Health Risk Management, China Medical University, Taichung, 404 Taiwan
| | - Wilfried Jj Karmaus
- Division of Epidemiology, Biostatistics, and Environmental Health, School of Public Health, University of Memphis, Memphis, 38152 USA
| | | | - John W Holloway
- Clinical and Experimental Sciences, Faculty of Medicine, and NIHR Respiratory Biomedical Research Unit, University of Southampton, Southampton, S016 6YD UK ; Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, SO16 6YD UK
| | - Susan Ewart
- Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, 48824 MI USA
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