Maternal Phthalate Exposure Promotes Allergic Airway Inflammation over Two Generations Via Epigenetic Modifications

Publication date: Available online 6 April 2017
Source:Journal of Allergy and Clinical Immunology
Author(s): Susanne Jahreis, Saskia Trump, Mario Bauer, Tobias Bauer, Loreen Thürmann, Ralph Feltens, Qi Wang, Lei Gu, Konrad Grützmann, Stefan Röder, Marco Averbeck, Dieter Weichenhan, Christoph Plass, Ulrich Sack, Michael Borte, Virginie Dubourg, Gerrit Schüürmann, Jan C. Simon, Martin von Bergen, Jörg Hackermüller, Roland Eils, Irina Lehmann, Tobias Polte
BackgroundPrenatal and early postnatal exposures to environmental factors are considered responsible for the increasing prevalence of allergic diseases. Although there is some evidence for allergy-promoting effects in children due to exposure to plasticizers like phthalates, findings of previous studies are inconsistent and lack mechanistic information.ObjectiveWe investigated the effect of maternal phthalate exposure on asthma development in the subsequent generations and their underlying mechanisms including epigenetic alterations.MethodsPhthalate metabolites were measured within the prospective mother-child cohort LINA and correlated with asthma development in the children. A murine trans-generational asthma model was used to identify involved pathways.ResultsIn LINA maternal urinary concentrations of mono-n-butyl phthalate, a metabolite of butyl benzyl phthalate (BBP), were associated with an increased asthma risk in the children. Using a murine trans-generational asthma model, we demonstrate a direct effect of BBP on asthma severity in the offspring with a persistently increased airway inflammation up to the F2 generation. This disease-promoting effect was mediated by a BBP-induced global DNA hypermethylation in CD4⁺ T cells of the offspring as treatment with a DNA demethylating agent alleviated exacerbation of allergic airway inflammation. 13 transcriptionally down-regulated genes linked to promoter or enhancer hypermethylation were identified. Among these, the GATA-3 repressor Zfpm1 emerged as a potential mediator of the enhanced susceptibility for Th2-driven allergic asthma.ConclusionThese data provide strong evidence that maternal BBP exposure increases the risk for allergic airway inflammation in the offspring by modulating the expression of genes involved in Th2 differentiation via epigenetic alterations.

Teaser

The study demonstrates that maternal phthalate exposure is a risk factor for asthma development in subsequent generations. These disease-promoting effects are mediated by epigenetic changes resulting in an altered expression of genes important for Th2-driven immune regulation.


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