Maternal exposure to polycyclic aromatic hydrocarbons and 5'-CpG methylation of interferon-γ in cord white blood cells.

Environmental Health Perspectives
Wan-yee TangShuk-Mei Ho

Abstract

Maternal factors are implicated in the onset of childhood asthma. Differentiation of naïve CD4+ T lymphocytes into pro-allergic T-helper 2 cells induces interleukin (IL)4 expression and inhibits interferon (IFN)γ expression accompanied by concordant methylation changes in the promoters of these genes. However, it has yet to be established whether maternal exposure to polycyclic aromatic hydrocarbons (PAHs) can alter these gene promoters epigenetically during fetal development. In this study we sought to elucidate the relationship between maternal PAH exposure and promoter methylation status of IFNγ and IL4. We assessed the effects of benzo[a]pyrene (BaP), a representative airborne PAH, on the methylation status of the IFNγ and IL4 promoters in Jurkat cells and two lung adenocarcinoma cell lines, and on gene expression. In addition, we evaluated methylation status of the IFNγ promoter in cord white blood cells from 53 participants in the Columbia Center for Children's Environmental Health cohort. Maternal PAH exposure was estimated by personal air monitoring during pregnancy. In vitro exposure of the cell models to low, noncytotoxic doses (0.1 and 1 nM) of BaP elicited increased promoter hypermethylation and reduced expression o...Continue Reading

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Methods Mentioned

BETA
PCR

Software Mentioned

Plus
SAS

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