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Phthalate exposure through different pathways and allergic sensitization in preschool children with asthma, allergic
Gabriel Bekö1, Michael Callesen2, Charles J Weschler3
1International Centre for Indoor Environment and Energy, Department of Civil Engineering, Technical University of Denmark, Nils Koppels Allé 402, 2800 Lyngby, Denmark.
Insights
Phthalate exposure in indoor environments, not diet, was linked to allergic sensitization in young children with existing allergic diseases. Non-dietary phthalates like DnBP, BBzP, and DEHP showed associations with increased allergic sensitization.
Area of Science:
- Environmental Health
- Allergy and Immunology
- Toxicology
Background:
- Phthalates are environmental chemicals with potential adjuvant properties, but human studies on their link to allergies are inconsistent.
- Rodent studies suggest phthalates can enhance allergen potency, warranting further investigation in human populations.
- Allergic diseases are common in children, and understanding environmental risk factors is crucial for prevention.
Purpose of the Study:
- To investigate the association between various phthalate exposure indicators and allergic sensitization in young children.
- To differentiate between dietary and non-dietary phthalate exposure pathways.
- To examine relationships between phthalate exposure and diagnosed allergic diseases (asthma, rhinoconjunctivitis, atopic dermatitis) and IgE sensitization.
Main Methods:
- A study cohort included 300 controls and 200 children with allergic diseases (ages 3-5).
- Phthalate exposure was assessed via dust samples (home/daycare), urinary metabolites, and estimated daily intakes.
- Allergic sensitization was determined by measuring specific IgE antibodies to 20 allergens; clinical status was confirmed.
- Statistical analyses, including adjusted logistic regressions, were used to identify associations.
Main Results:
- No direct associations were found between overall phthalate exposure and the prevalence of asthma, rhinoconjunctivitis, or atopic dermatitis.
- Significant associations were observed between non-dietary phthalate exposures (DnBP, BBzP, DEHP) in indoor dust and allergic sensitization among children with existing allergic diseases.
- Exposure pathways via indoor dust (mass fractions, ingestion, inhalation, dermal absorption) showed stronger links to sensitization than urinary metabolites, which reflect broader exposure.
- Accounting for exposure in multiple environments (home and daycare) influenced some observed associations.
Conclusions:
- Non-dietary phthalate exposure in the indoor environment is associated with allergic sensitization in children with allergic diseases.
- Specific phthalates (DnBP, BBzP, DEHP) and exposure routes (dust) are implicated, suggesting targeted reduction strategies may be beneficial.
- Further research is needed to confirm these findings and elucidate the complex interplay between phthalate exposure, allergic disease, and sensitization pathways.
Abstract:
Studies in rodents indicate that phthalates can function as adjuvants, increasing the potency of allergens. Meanwhile, epidemiological studies have produced inconsistent findings regarding relationships between phthalate exposures and allergic disease in humans. The present study examined phthalate exposure and allergic sensitization in a large group of 3-5 year old children: 300 random controls and 200 cases with asthma, rhinoconjunctivitis or atopic dermatitis as reported in questionnaires. The children were clinically examined to confirm their health status. Blood samples were analyzed for IgE sensitization to 20 allergens. Adjusted logistic regressions were used to look for associations between phthalate exposure indicators (mass fractions in dust from children's homes and daycares, metabolites in urine, and estimated daily indoor intakes from dust ingestion, inhalation and dermal absorption) and sensitization and allergic disease. No direct associations were found between phthalate exposures and asthma, rhinoconjunctivitis or atopic dermatitis. However, among children with these diseases, there were significant associations between non-dietary exposures to DnBP, BBzP and DEHP in the indoor environment (mass fractions in dust or daily indoor intakes from dust ingestion, inhalation and dermal absorption) and allergic sensitization. Some exposure pathways were more strongly associated with sensitization than others, although the results are not conclusive and require confirmation. A number of the associations depended on accounting for a child's exposure in more than one environment (i.e., daycare facility as well as home). Significant associations were not observed between phthalate metabolites in urine, which reflected exposure from diet as well as indoor pathways, and allergic sensitization.
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