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Exacerbation of polyethylene microplastics in animal models of DSS-induced colitis through damage to intestinal epithelial cell conjunctions
Summary
Researchers tested the effects of UV-aged polyethylene microplastics on mice with chemically induced colitis, a model for inflammatory bowel disease. They found that the microplastics worsened intestinal inflammation by damaging the junctions between intestinal lining cells, weakening the gut barrier. The study suggests that microplastic exposure could aggravate existing gut conditions by compromising the protective intestinal wall.
Microplastics are pollutants that occur in various environments and habitats. Inflammatory bowel disease (IBD) is a chronic inflammatory disease accompanied with diarrhea, and the number of patients has increased worldwide. In this study, manufactured fragmented polyethylene-microplastics in the size range of 10-30 ㎛, were oxidized by exposure to ultraviolet light, and then administered to a dextran sodium sulfate-induced colitis mouse model to observe the effects of polyethylene-microplastics on IBD. In the microplastics-treated groups, an increase in disease activity index score, histopathological score, and a decrease in the areas of goblet cells were observed. In addition, the tight junction proteins, ZO-1 and Occludin, were significantly decreased, whereas MPO was significantly increased. Interestingly, E-cadherin, which is an adheren junction, was also decreased, presumably because of the physical effects of microplastics. The results suggest that polyethylene-microplastics worsen IBD and microplastics can affect not only tight junctions, but also adheren junctions.