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Impact of particulate microplastics generated from polyethylene terephthalate on gut pathology and immune microenvironments
Summary
Researchers generated particulate microplastics from polyethylene terephthalate (PET) and investigated their impact on gut health using mouse models, histological examinations, and multi-omics analysis. The study found that while chronic low-dose PET microplastic exposure did not cause visible intestinal damage, it did alter the gut immune microenvironment and microbiota composition, suggesting subtle but measurable biological effects.
Environmental microplastics have emerged as a critical issue in maintaining the planetary ecosystem. In this study, we generated particulate microplastics from polyethylene terephthalate (PM-PET) and investigated their impact in the gut by using mouse models and implementing histological examinations, as well as multi-omics analysis for colonic immune cells and microbiota. As a result, histological approaches showed that chronic and physiological low dose exposure of PM-PET did not affect intestinal pathology and mucin barriers, respectively. Moreover, immunohistochemical analysis demonstrated that the numbers of T cells, B cells, macrophages, and granulocytes were not affected by the exposure to PM-PET. However, RNA-seq analysis revealed that PM-PET had a substantial impact on the transcriptome in gut immune cells and their metabolisms, while 16s rRNA metagenomic analysis showed that the composition of microbiota was modestly affected. These results suggest an unexpected role played by the PM-PET in affecting gut immune homeostasis without detectable inflammation.