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Identifying sensitive windows for prenatal particulate air pollution exposure and mitochondrial DNA content in cord blood.

Abstract：

INTRODUCTION:Changes in mitochondrial DNA (mtDNA) can serve as a marker of cumulative oxidative stress (OS) due to the mitochondria's unique genome and relative lack of repair systems. In utero particulate matter ≤2.5μm (PM2.5) exposure can enhance oxidative stress. Our objective was to identify sensitive windows to predict mtDNA damage experienced in the prenatal period due to PM2.5 exposure using mtDNA content measured in cord blood. MATERIAL AND METHODS:Women affiliated with the Mexican social security system were recruited during pregnancy in the Programming Research in Obesity, Growth, Environment and Social Stressors (PROGRESS) study. Mothers with cord blood collected at delivery and complete covariate data were included (n=456). Mothers' prenatal daily exposure to PM2.5 was estimated using a satellite-based spatio-temporally resolved prediction model and place of residence during pregnancy. DNA was extracted from umbilical cord leukocytes. Quantitative real-time polymerase chain reaction (qPCR) was used to determine mtDNA content. A distributive lag regression model (DLM) incorporating weekly averages of daily PM2.5 predictions was constructed to plot the association between exposure and OS over the length of pregnancy. RESULTS:In models that included child's sex, mother's age at delivery, prenatal environmental tobacco smoke exposure, birth year, maternal education, and assay batch, we found significant associations between higher PM2.5 exposure during late pregnancy (35-40weeks) and lower mtDNA content in cord blood. CONCLUSIONS:Increased PM2.5 during a specific prenatal window in the third trimester was associated with decreased mtDNA content suggesting heightened sensitivity to PM-induced OS during this life stage.

journal_name

Environ Int

journal_title

Environment international

authors

Rosa MJ,Just AC,Guerra MS,Kloog I,Hsu HL,Brennan KJ,García AM,Coull B,Wright RJ,Téllez Rojo MM,Baccarelli AA,Wright RO

doi

10.1016/j.envint.2016.11.007

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

198-203

eissn

0160-4120

issn

1873-6750

pii

S0160-4120(16)30741-3

journal_volume

pub_type

杂志文章

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Identifying sensitive windows for prenatal particulate air pollution exposure and mitochondrial DNA content in cord blood.