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Mechanisms underlying Th2-dominant pneumonia caused by plastic pollution derivatives (PPD): A molecular toxicology investigation that encompasses gut microbiomics and lung metabolomics
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In a mouse study, exposure to dibutyl phthalate (a plastic additive) and polystyrene microplastics for five weeks caused pneumonia-like lung damage, increased oxidative stress, and triggered inflammation. The researchers found that these plastic pollution byproducts caused a specific type of immune response that leads to eosinophilic inflammation in the airways, connected through the gut-lung axis. The findings suggest that everyday exposure to plastic-derived chemicals and particles could contribute to respiratory disease.
An investigation was conducted by researchers on how dibutyl phthalate (DBP) and polystyrene microplastics (PS-MP) influence the development of pneumonia using a mouse model. For a duration of five weeks, the mice were subjected to exposure of DBP (30 mg/kg/day) and PS-MP (0.1 mg/day). The findings indicated notable pathological alterations in airway tissues, increased oxidative stress levels, and intensified inflammation, thereby establishing a connection between plastic pollution and pneumonia. Further examination indicated the involvement of ferroptosis and oxidative stress in the progression of the disease. Administration of deferoxamine (DFO) (100 mg/kg) resulted in symptom relief and reduced pathological alterations, as validated by metabolomic investigations. Increased levels of reactive oxygen species (ROS) triggered a Th2-mediated eosinophilic inflammatory response, marked by elevated IL-4 and reduced IFN-γ via the NFκB pathway. Moreover, analyses of the gut microbiome and metabolomics demonstrated that PPD modifies microbial populations and pulmonary metabolism, linking its effects on pneumonia through the gut-lung axis. This research highlights the health hazards associated with plastic pollution and proposes a framework for tackling these issues.
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Mechanisms of exacerbation of Th2-mediated eosinophilic allergic asthma induced by plastic pollution derivatives (PPD): A molecular toxicological study involving lung cell ferroptosis and metabolomics
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Researchers found that mice exposed to polystyrene microplastics combined with a common plastic additive (dibutyl phthalate) developed significantly worse allergic asthma symptoms, including increased airway inflammation driven by a specific type of immune response. The microplastics triggered a form of cell death called ferroptosis in lung cells, which amplified the allergic reaction. Treatment with an iron-binding drug provided relief, suggesting potential therapeutic approaches for people with asthma who are exposed to plastic pollution.
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Researchers exposed both healthy and asthmatic mice to airborne microplastics and found significant lung inflammation, immune activation, and increased mucus production in both groups. Microplastic particles were taken up by immune cells called macrophages, and gene analysis revealed changes in immune response, cellular stress, and cell death pathways. The study suggests that inhaling microplastics may worsen respiratory health in both normal and vulnerable populations.
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Researchers gave mice PET nanoplastics orally for 28 days and analyzed the microbiome in their lungs, colon, mouth, and stool. While gut and oral bacteria were relatively unchanged, the lung microbiome showed significant shifts, including increases in bacteria associated with respiratory inflammation. The findings suggest a gut-lung connection where ingested nanoplastics may influence lung microbial communities even when gut bacteria appear unaffected.
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Scientists exposed mice to tiny plastic particles from PET (a common plastic in bottles and polyester clothing) and found the particles stuck around in the lungs for two weeks and triggered inflammation, especially when combined with allergens like ragweed pollen. This suggests breathing in these ultra-small plastic fragments could worsen allergic reactions or immune responses, though this was tested in mice at controlled doses, so more research is needed before we know exactly what this means for people breathing in everyday microplastics.
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