PET microplastics remain in lungs and worsen respiratory tract inflammation
New research led by the Medical University of Vienna suggests that microplastics may play a more active role in the body than previously understood, specifically regarding the immune system. A study focused on polyethylene terephthalate (PET) particles found that these materials can remain in the lungs of mice and exacerbate respiratory inflammation.
The Impact of PET Microplastics on Respiratory Health
The research team, led by Michelle Epstein of the Department of Dermatology’s Experimental Allergy Laboratory, utilized a mouse model to examine PET particles of various sizes and dosages. PET is a common plastic found in textiles, medical materials, drinks bottles, and packaging.
Findings revealed that after a single administration through the respiratory tract, medium-sized PET microplastics remained detectable in the lungs for at least 14 days. This presence triggered an inflammatory response marked by the increased migration of eosinophils and lymphocytes, which are immune cells typically associated with allergic reactions.
Interaction With Allergens and Systemic Effects
The study further explored how these particles interact with common triggers. When PET microplastics were combined with ragweed pollen—a frequent respiratory allergen—respiratory inflammation was exacerbated under certain conditions.
Researchers also tested the introduction of PET microplastics via the abdominal cavity in combination with other allergens. This method resulted in an altered systemic immune response, where the particles influenced the antibody response against the allergen and exacerbated inflammation.
Significance and Future Research
The findings, published in the Journal of Hazardous Materials Advances, suggest that microplastics do not simply sit idle within the body. “Our study shows that PET microplastics do not simply remain in the body, but actively influence immune responses involved in the development and exacerbation of allergic reactions and inflammation,” stated study lead Michelle Epstein.
However, the researchers cautioned that because these results were obtained in mouse models, they cannot be directly extrapolated to real-world human exposure. Epstein noted, “Nevertheless, they provide important insights into the potential immunological effects of microplastics, which once again highlight the health relevance of this environmental burden and must be investigated in further studies.”
Future research may focus on whether similar mechanisms occur in humans and how different types of plastic particles could further influence long-term immune health.
Frequently Asked Questions
What is PET and where is it found?
PET (polyethylene terephthalate) is one of the world’s most common plastics, used in drinks bottles, packaging, textiles, and medical materials.
How long did the microplastics stay in the lungs during the study?
In the mouse model, medium-sized PET microplastics remained detectable in the lungs for at least 14 days following a single administration.
Can these findings be applied directly to humans?
No. The researchers emphasize that the results were obtained in mouse models and cannot be directly extrapolated to real-world exposure conditions in humans.
How do you feel about the increasing presence of microplastics in everyday consumer products?