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Enriched microplastic-associated biofilms exacerbate gut microbial dysbiosis and metabolic disruption in mice
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Microplastics floating in water and sediment don't just carry plastic, they also host slimy microbial communities (biofilms) that pack extra antibiotic-resistance genes and disease-causing traits. When mice ate these microplastic-associated biofilms, it disrupted their gut bacteria, weakened the gut's protective barrier, and altered digestive chemistry linked to inflammation. While this was tested in mice, not humans, it's an early warning sign that microplastics may be a hidden vehicle for harmful bacteria that could mess with our gut health, not just the plastic particles themselves.
Microplastics (MPs) and opportunistic pathogens are recognized as emerging environmental hazards, yet the health risks associated with mammalian exposure to biofilms enriched on MP surfaces remain poorly characterized. This study evaluated the characteristics of microbial biofilms enriched on MPs from aquatic and sediment matrices over 12 weeks and assessed their potential health impacts using a murine mammalian model. Metagenomic profiling showed that the enriched biofilms exhibited alterations in community composition, accompanied by an overrepresentation of genes associated with antibiotic resistance, iron acquisition, and virulence traits. In the murine model, dietary exposure to the MP-associated biofilms coincided with changes in host intestinal inflammatory markers and a distinct shift in the gut microbiota profile. Metabolomic analysis further revealed synchronous alterations in extracellular and fecal metabolite profiles, including profiles linked to secondary bile acid pathways, alongside a downregulation of intestinal barrier tight junction markers. These parallel taxonomic and metabolic shifts indicate that environmental biofilms enriched on microplastics can provoke complex physiological responses in a mammalian host. This study provides a valuable framework for assessing the potential mammalian health risks posed by plastisphere-associated microbial complexes.
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Microplastic's effects on gene expression and microflora of mice colon in health and acute colitis
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Mice that drank water with microplastic particles for six weeks showed changes in their gut lining and gut bacteria — in healthy mice, the gut seemed to adapt by boosting protective processes, but in mice with induced colon inflammation, microplastics actually weakened some of the gut's defensive responses. This suggests that microplastic exposure could make an already-inflamed gut less able to protect itself, raising concerns about its role in worsening conditions like inflammatory bowel disease in people who already have gut issues.
Effects induced by polyethylene microplastics oral exposure on colon mucin release, inflammation, gut microflora composition and metabolism in mice
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Researchers fed mice polyethylene microplastics for 30 days and found that even low doses reduced protective mucus in the colon, altered inflammation markers, and shifted the composition of gut bacteria. The microplastics increased the ratio of Bacteroides to Firmicutes bacteria and affected metabolic pathways in the gut microbiome. The study suggests that oral microplastic exposure may disrupt intestinal health by modifying the gut microbial community and its metabolism.
Microplastics as vectors for microbial pollutants: Biofilm-associated transfer of pathogens and antibiotic resistance genes in zebrafish intestine
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Scientists found that microplastics coated in bacterial "biofilms" can act like tiny rafts, ferrying harmful germs and antibiotic-resistance genes into the gut, and surprisingly, "biodegradable" plastic (PLA) transferred more of these risky microbes than regular plastic (PP). This matters because it suggests eco-friendly plastics aren't necessarily safer for our health, and swallowing microplastics (through food, water, etc.) could potentially disrupt gut bacteria and contribute to the spread of antibiotic resistance, though this study was done in fish, not humans.
The impact of microplastics on the mice gut microbiome: a meta-analysis.
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A new analysis combining data from multiple mouse studies found that eating microplastics measurably shifts the balance of bacteria living in the gut, boosting certain groups involved in digestion and metabolism. While this research was done in mice, not humans, it adds to growing evidence that the tiny plastic particles we're all exposed to daily could be quietly altering our gut bacteria in ways that might affect digestion and overall health, making this an area worth watching closely as research continues.
Biofilm enhances the interactive effects of microplastics and oxytetracycline on zebrafish intestine
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Researchers found that microplastics coated with bacterial biofilms (natural microbial layers that form in water) caused more intestinal damage to zebrafish than clean microplastics. The biofilm-coated particles increased pathogenic bacteria in the gut by several times and significantly boosted antibiotic resistance genes. This matters because microplastics in real-world water are almost always coated with biofilms, meaning the actual health risks from waterborne microplastics may be greater than lab studies using clean particles suggest.
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