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Urinary phthalate metabolites and biomarkers of oxidative stress in pregnant women: A repeated measures analysis
Ferguson, KK; Mcelrath, TF; Chen, YH; Mukherjee, B; Meeker, JD
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Environmental Health Perspectives
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Phthalate exposure occurs readily in the environment and has been associated with an array of health endpoints, including adverse birth outcomes. Some of these may be mediated by oxidative stress, a proposed mechanism for phthalate action.
In the present study we explore the associations between phthalate metabolites and biomarkers of oxidative stress measured in urine samples from multiple time points during pregnancy.
Women were participants in a nested case-control study of preterm birth (N=130 cases, N=352 controls). Each was recruited early in pregnancy and followed until delivery, providing urine samples at up to 4 visits. Nine phthalate metabolites were measured to assess exposure, and 8-hydroxydeoxyguanosine and 8-isoprostane were also measured in urine as markers of oxidative stress. Associations were assessed using linear mixed models to account for intra-individual correlation, with inverse selection probability weightings based on case status to allow for greater generalizability.
Interquartile range increases in phthalate metabolites were associated with significantly higher concentrations of both biomarkers. Estimated differences were greater in association with mono-benzyl phthalate (MBzP), mono-n-butyl phthalate (MBP), and mono-iso-butyl phthalate (MiBP), compared with di-2-ethylhexyl (DEHP) metabolites.
Urinary phthalate metabolites were associated with increased oxidative stress biomarkers in our study population of pregnant women. These relationships may be particularly relevant to the study of birth outcomes linked to phthalate exposure. Although replication is necessary in other populations, these results may also be of great importance for a range of other health outcomes associated with phthalates.
Environment Abstracts; Health & Safety Science Abstracts; Toxicology Abstracts; Oxidative stress; Phthalic acid; biomarkers; Population studies; Phthalates; Pregnancy; Metabolites; 8-Hydroxydeoxyguanosine; Replication; Bioindicators; Internet; Females; ENA 02:Toxicology & Environmental Safety; X 24350:Industrial Chemicals; H 12000:Epidemiology and Public Health
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