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Polystyrene nanoplastics promotes inflammation and aging in young mice through the oral-gut microbiome axis
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Scientists found that tiny plastic particles (nanoplastics, from the breakdown of everyday plastics) caused young mice to show signs of inflammation and premature aging in their lungs and liver after regular exposure. The likely culprit: these plastics threw off the balance of healthy bacteria in both the mouth and gut, triggering stress and aging signals throughout the body. While this study was done in mice, it raises real concerns about how the plastics we're constantly exposed to might be quietly aging us from the inside out.
With the escalating global pollution of nanoplastics, their impacts on organismal health have become a focal concern. The oral-gut microbiota axis plays a pivotal role in host health regulation, yet how nanoplastics influence this axis and drive inflammation and aging in young organisms remain undefined. This study aimed to investigate whether polystyrene nanoplastics (PS-NPs) promote inflammation and aging in young mice by disrupting the oral-gut microbiota axis. Therefore, we established a free-feeding model with 1000 μg/L PS-NPs using 8-week-old C57BL/6 mice. We quantified tissue inflammatory cytokines and cellular senescence markers to assess PS-NPs-induced inflammatory and aging effects, while 16S rRNA sequencing was employed to characterize oral and gut microbiota structural changes. We found that PS-NPs exposure significantly increased the expression levels of cellular senescence markers p21 Cip1/Waf and p16 Ink4a in lung and liver. Meanwhile, PS-NPs promoted the release of inflammatory cytokines such as IL-1β, IL-6 and TNF-α, by modulating the p38 MAPK pathway. In addition, PS-NPs also decreased the expression levels of antioxidant genes. Furthermore, 16S rRNA sequencing analysis revealed that PS-NPs exposure caused dysbiosis in oral and intestinal microbiota, manifested as significant alterations in microbial diversity and community structure. Our work provided mechanistic insights into nanoplastic toxicity and theoretical basis for developing preventive strategies.
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Polystyrene microplastics exposure increases the disruption of intestinal barrier integrity and gut microbiota homeostasis during obesity and aging
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Researchers found that polystyrene microplastic exposure worsened intestinal barrier dysfunction in mice on high-fat diets, with the combination of obesity and microplastic exposure producing greater gut permeability and inflammation than either factor alone, suggesting compounding risks in metabolically vulnerable individuals.
Oral exposure to high concentrations of polystyrene microplastics alters the intestinal environment and metabolic outcomes in mice
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In a mouse study, oral exposure to high concentrations of polystyrene microplastics caused fatty liver disease and abnormal blood lipid levels even without prior gut leakiness. The microplastics triggered intestinal inflammation through immune cells, disrupted gut bacteria, and altered how the body processes nutrients. These results suggest that swallowing microplastics could contribute to metabolic problems and liver disease in humans.
Microplastics, the gut microbiome and ageing: mechanisms and intervention strategies.
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This review pulls together existing research showing that tiny plastic particles we breathe, eat, and absorb through our skin may disrupt the gut microbiome (the community of bacteria living in our digestive system), which in turn can speed up aging and raise the risk of conditions like heart disease and brain decline. The particles seem to trigger inflammation and cellular damage that harm the body over time, though this paper doesn't present new experiments—it summarizes what scientists already know and suggests possible ways to reduce plastic exposure and its health effects. The takeaway: cutting down on microplastic exposure could be one more tool for supporting heal
Oral exposure to nanoplastics and food allergy in mice fed a normal or high-fat diet
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Researchers studied how oral exposure to polystyrene nanoplastics affects food allergy responses in mice fed either a normal or high-fat diet. They found that nanoplastics worsened allergic reactions to a food protein, particularly in mice on the high-fat diet, by increasing gut permeability and shifting immune responses. The study suggests that the combination of nanoplastic exposure and a Western-style diet may be contributing to the rising prevalence of food allergies.
The role of gut microbiota in mediating increased toxicity of nano-sized polystyrene compared to micro-sized polystyrene in mice
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This mouse study found that nano-sized polystyrene plastics were significantly more toxic than micro-sized ones, causing greater gut inflammation, liver damage, and metabolic disruption. The key difference was driven by how each size affected gut bacteria: nanoplastics caused a more severe shift toward harmful bacteria and away from beneficial ones. The findings suggest that the smallest plastic particles may pose the greatest health risk because they more dramatically disrupt the gut microbiome.
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