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Initial exploration of the health effects on Qinghai-Tibetan Plateau yaks following short-term exposure to polystyrene microplastics: Analysis of rumen microbiota, host metabolism, antioxidant function and inflammatory responses
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Scientists exposed yaks to microplastics for a week and found that while it triggered some inflammation, the animals' gut bacteria seemed to help buffer the negative effects, keeping things like antioxidant levels stable. This matters because microplastics are now everywhere in our food and water, and this study hints that gut bacteria might play a protective role against plastic exposure in animals (and possibly humans) — but we still don't know what happens with longer-term exposure.
Microplastics (MPs) are ubiquitous across environments including the Qinghai-Tibet Plateau. Most existing MPs studies focus on aquatic animals and rodents, while MPs influences on yaks (Bos grunniens) remain poorly understood. Using yaks as animal models, we combined metagenomics and metabolomics to explore short-term polystyrene-MPs (PS-MPs) impacts on ruminal microbiota, metabolism, antioxidant capacity and inflammation. Seven-day PS-MPs exposure reshaped rumen microbiota and elevated β-diversity. Four KEGG pathways (peptidoglycan synthesis, vitamin B6/riboflavin metabolism, terpenoid backbone biosynthesis) were enriched alongside altered extracellular polysaccharides composition. Serum metabolomics revealed elevated L-glutamine and indole-3-propionic acid, coupled with reduced 2-C-methyl-D-erythritol 2,4-cyclodiphosphate and indole-3-lactic acid post-exposure. Urinary metabolomics revealed decreased D-erythrose 4-phosphate, dimethyl allyl pyrophosphate, and 2-C-methyl-D-erythritol 2,4-cyclodiphosphate, collectively indicating inhibited terpenoid backbone biosynthesis in yaks. Additionally, PS-MPs triggered inflammatory responses, evidenced by elevated levels of pro-inflammatory cytokines (interferon-γ, interleukin-1β, interleukin-6, interleukin-17, interleukin-22, tumor necrosis factor-α, transforming growth factor-α), yet antioxidant function indexes (total antioxidant capacity, superoxide dismutase, glutathione peroxidase, catalase and malondialdehyde) showed no significant changes. Multi-omics suggested Prevotella ruminicola may help resist PS-MPs invasion. In summary, rumen microbes may alleviate PS-MPs adverse effects, explaining yaks' mild responses to short-term PS-MPs exposure. Long-term MPs effects, tissue deposition and related molecular mechanisms warrant further study.
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Scientists fed lambs small amounts of polystyrene microplastics (the same type found in packaging and everyday plastics) for 40 days and found it disrupted the balance of gut bacteria throughout their digestive systems, with the small and large intestines affected most. This matters because our gut bacteria play a huge role in digestion, immunity, and overall health, and since microplastics are already showing up in human food and water, this animal study suggests they could similarly throw off our own gut microbiome in ways we don't yet fully understand.
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Researchers exposed mice to polystyrene microplastics for six weeks and found that the particles accumulated in the gut, reduced protective mucus secretion, and damaged the intestinal barrier. The microplastics also significantly altered the composition of gut bacteria, decreasing beneficial species and increasing harmful ones. The study suggests that microplastic ingestion could disrupt gut health in mammals by simultaneously impairing the physical barrier and reshaping the microbiome.
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Scientists studied how gut bacteria affect the health impacts of microplastics (tiny plastic particles) using lab worms as a model. They found that different types of plastic-eating bacteria in the gut can either make microplastic exposure more harmful or help protect against it. This research suggests that the specific mix of bacteria in our intestines might influence how dangerous microplastics are to our health.
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