Allergy & Immunology
OTHER
Plasma GPX activity negatively correlates with non-EoE atopic disease in pediatric subjects only
Frontiers in Medicine
Published April 1, 2026
DOI ↗
An exploratory study investigated whether plasma glutathione peroxidase (GPX) activity could serve as a non-invasive biomarker for atopic diseases, including eosinophilic esophagitis (EoE), in pediatric and adult subjects. The specific intervention or exposure, comparator, sample size, setting, and follow-up duration were not reported. The primary outcome was the correlation between plasma GPX activity levels and EoE disease activity, while secondary outcomes included correlation with other atopic diseases.
The main results showed plasma GPX activity levels did not correlate with EoE. However, in pediatric subjects, plasma GPX activity levels were negatively correlated with non-EoE atopic disease. This correlation was not observed in adult subjects. No effect sizes, absolute numbers, or statistical measures (p-values or confidence intervals) were reported for these correlations. The authors note these findings represent correlation, not causation.
Safety and tolerability data were not reported. Key limitations include the exploratory nature of the study and the explicit need for future research to determine clinical utility and underlying biological mechanisms. Given the preliminary design and lack of reported statistical details, these findings should be interpreted cautiously and do not yet support clinical application. The study's funding and conflicts of interest were not reported.
Researchers conducted an early, exploratory study to see if a simple blood test measuring an enzyme called glutathione peroxidase (GPX) could be useful for tracking allergic diseases. They looked at GPX activity in the blood of both children and adults with conditions like atopic dermatitis, food allergies, allergic rhinitis, asthma, and eosinophilic esophagitis (EoE). The study did not report the number of people involved or other key details about how it was done.
They found that in children, lower levels of GPX activity in the blood were linked to having non-EoE allergic diseases. However, this link was not seen in adults. Importantly, GPX activity did not correlate at all with disease activity in EoE, which was one of the main questions the researchers were asking. The study did not report any safety concerns, as it was just measuring blood levels.
The main reason to be careful with these results is that this was an exploratory study. This means it is a very first look at a possible connection, and much more research is needed. The findings do not prove that low GPX causes allergies or that raising it would help. They also do not provide a useful test for doctors to use with patients right now.
Readers should understand this as a small piece of early scientific research. It suggests a biological pathway that might be different in children with common allergies, which scientists can now investigate further. It does not change how allergies are currently diagnosed or managed.
What this means for you: Early research found a blood enzyme link to childhood allergies, but it's not ready for use as a test.
View Original Abstract ↓
Atopic diseases, including atopic dermatitis, food allergy, allergic rhinitis, asthma, and eosinophilic esophagitis (EoE), are characterized by chronic inflammatory responses to aero- and/or food allergens. Oxidative stress has been increasingly implicated in the pathogenesis of these conditions. Antioxidant glutathione peroxidase (GPX) enzymes help mitigate oxidative stress by neutralizing hydrogen peroxide and lipid hydroperoxides. Since EoE requires invasive procedures for diagnosis and surveillance, our primary aim was to determine whether plasma GPX activity levels can be used as a non-invasive biomarker for disease activity, and our secondary aim was to determine whether plasma GPX activity levels correlate with other atopic diseases. While plasma GPX activity levels did not correlate with EoE, they did negatively correlate with non-EoE atopic disease in pediatric, but not adult subjects. These findings necessitate future studies to determine their clinical utility and underlying mechanisms.
