New research hyperlinks perfluoroalkyl substance publicity to childhood bronchial asthma phenotypes


A current research revealed within the eBioMedicine Journal evaluated the results of publicity to perfluoroalkyl substances on bronchial asthma phenotypes.

Study: Exposures to perfluoroalkyl substances and asthma phenotypes in childhood: an investigation of the COPSAC2010 cohort. Image Credit: RybalchenkoNadezhda/Shutterstock.comResearch: Exposures to perfluoroalkyl substances and bronchial asthma phenotypes in childhood: an investigation of the COPSAC2010 cohort. Picture Credit score: RybalchenkoNadezhda/


Atopic ailments and bronchial asthma are early immune ailments and current complicated etiologies. Environmental publicity to xenobiotics has elevated in current generations.

Perfluorooctanoate (PFOA) and perfluoro octane sulfonate (PFOS) are essentially the most studied per-and poly-fluoroalkyl substances (PFAS). PFOS and PFOA, detectable in maternal blood, can cross the placental barrier and have been detected in wire blood and amniotic fluid.

PFOA or PFOS publicity has been studied relating to childhood bronchial asthma. Lately, a meta-analysis confirmed elevated dangers of atopic dermatitis and allergic rhinitis as a consequence of PFOS and PFOA, respectively, however associations with bronchial asthma had been inconsistent.

Nevertheless, bronchial asthma phenotypes (atopic and non-atopic) weren’t stratified, which is essential on condition that childhood bronchial asthma is complicated with heterogeneous analysis protocols. 

In regards to the research

Within the current research, researchers explored the associations of being pregnant and early childhood publicity to PFOA and PFOS with bronchial asthma phenotypes. This was a part of an ongoing Copenhagen potential research of bronchial asthma in childhood 2010 (COPSAC2010) mother-child cohort, comprising 738 females.

Pregnant people had been invited to take part throughout 2008-10. Topics and their kids accomplished 14 scientific and acute care visits within the first six years of life. Private interviews had been carried out at scientific visits by medical doctors and analysis assistants. Familial, medical, socio-economic, and environmental histories had been assessed.

Utilizing untargeted plasma metabolomics, the relative abundance of PFOA and PFOS was measured in blood samples of pregnant people at gestational weeks 24 and one week postpartum and youngsters at six months, 18 months, and 6 years. Subsequently, 48 samples had been quantified for PFOA and PFOS ranges utilizing focused re-analysis and calibration pipeline.

The research’s major outcomes included bronchial asthma and allergic reactions; secondary outcomes had been infections in youth and lung operate measures.

Included covariates had been a priori elements related to PFOA or PFOS, equivalent to parity, race, pre-pregnancy physique mass index (BMI), maternal age and bronchial asthma, urbanicity, ever presence of PFOS or PFOA in water provide, and social circumstances. DNA methylation was evaluated within the nasal epithelium at six years. 

Spearman’s correlation coefficient was used to estimate PFOA and PFOS correlations. Principal part evaluation (PCA) was carried out to evaluate the covariance of PFOA and PFOS. Results of PFOA or PFOS publicity had been individually investigated. Cox, logistic, and linear regression fashions analyzed time-to-event, binary, and steady outcomes.


Legitimate PFOS and PFOA measurements had been accessible for 727 and 684 females at gestational week 24 and one week postpartum, respectively. Equally, 602, 606, and 513 kids had legitimate measures at six months, 18 months, and 6 years, respectively.

Maternal PFOS and PFOA concentrations had been extremely correlated; youngster concentrations in youth had been additionally correlated throughout the youngster and between mom and youngster.

PCA revealed that PFOA and PFOS had been extremely correlated. At six years, 437 kids had information on bronchial asthma, inhalant sensitization, and eosinophils. Non-atopic bronchial asthma was noticed in 16 kids, and atopic bronchial asthma in 24 kids. Maternal PFOA and PFOS concentrations had been related to bronchial asthma at six years, pushed by the affiliation with non-atopic phenotypes.

Childhood ranges of PFOA and PFOS at six and 18 months had been related to a decreased threat of inhalant sensitization at six years. Childhood concentrations weren’t related to bronchial asthma or atopic dermatitis.

Maternal and youngster concentrations of PFOA or PFOS weren’t related to the next threat of infections in youth. PFOS or PFOA weren’t related to lung spirometry measures at six years.

A statistically vital affiliation was noticed between maternal PFOA ranges and high-sensitivity C-reactive protein concentrations at gestational week 24.

Weak PFOA or PFOS concentrations had been related to innate immune responsiveness to bacterial or viral ligands and T-cell stimulations. Being pregnant and youngster ranges of PFOA or PFOS weren’t associated to adjustments in DNA methylation within the nasal epithelium at six years.


The findings confirmed that greater prenatal publicity to PFOS and PFOA was related to an elevated threat of non-atopic bronchial asthma phenotype by six years. No associations had been reported for bronchial asthma exacerbations, atopic bronchial asthma, lung operate, atopic dermatitis, and customary infections.

In parallel, prenatal PFOS was related to a decrease threat of inhalant allergen sensitization. The research revealed an affiliation between maternal publicity and the next threat of non-atopic bronchial asthma phenotype at six years, pointing in direction of potential bronchial asthma subtype-specific prenatal programming.

Journal reference:

  • Sevelsted, A., Pedersen, C.-E.T., Gürdeniz, G., Rasmussen, M.A., Schullehner, J., Sdougkou, Okay., Martin, J.W., Lasky-Su, J., Morin, A., Ober, C., Schoos, A.-M.M., Stokholm, J., Bønnelykke, Okay., Chawes, B. & Bisgaard, H. (2023) Exposures to perfluoroalkyl substances and bronchial asthma phenotypes in childhood: an investigation of the COPSAC2010 cohort. eBioMedicine, 94, p.104699. doi: 10.1016/j.ebiom.2023.104699.


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