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Molecular mechanism differences between nanoplastics and microplastics in colon toxicity: nanoplastics induce ferroptosis-mediated immunogenic cell death, while microplastics cause cell metabolic reprogramming
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This study discovered that nanoplastics and microplastics damage the colon through completely different mechanisms depending on their size: nanoscale particles (100 nm) get inside cells and trigger a type of cell death called ferroptosis, while larger particles (10 micrometers) cause physical damage and force cells to switch their energy production. These findings suggest that the smallest plastic particles may pose unique health risks to the gut that differ from larger ones.
This study investigates the size-dependent mechanisms by which polystyrene (PS) microplastics (MPs) cause intestinal epithelial injury, focusing on the differential effects of nanoscale (100 nm) and microscale (10 μm) particles. Using both cellular and animal models, we found that 100 nm MPs are internalized by intestinal epithelial cells via endocytosis, triggering oxidative stress and ferroptosis, while 10 μm MPs primarily induce epithelial damage through mechanical disruption and metabolic reprogramming. Proteomic analyses revealed that small MPs significantly upregulate ferroptosis-related genes, including Fosl1 and components of the p53 pathway. Functional studies showed that Fosl1 promotes p53 transcription, suppresses Slc7a11, and contributes to ferroptosis. Mechanistically, ferroptosis was characterized by intracellular iron accumulation, glutathione (GSH) depletion, GPX4 inactivation, and excessive lipid peroxidation. Treatment with Ferrostatin-1 or Fosl1 knockdown alleviated ferroptosis and epithelial injury. In contrast, large MPs activated the mechanosensitive YAP pathway, leading to cytoskeletal remodeling and a metabolic shift from oxidative phosphorylation to anaerobic glycolysis. This metabolic reprogramming was associated with increased inflammation. These findings demonstrate that microplastic particle size critically determines toxicity mechanisms—ferroptosis for small particles and YAP-mediated metabolic disruption for large ones—and suggest potential therapeutic targets for mitigating microplastic-induced intestinal damage.
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Toxicity Differences Between Microplastics and Nanoplastics in Organs: From Molecular Mechanisms to Potential Therapeutic Strategies
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This review pulls together existing research on how tiny plastic particles from our environment—both microplastics and even smaller nanoplastics—affect the body differently based on their size. The smallest particles can slip into cells and damage energy-producing structures, causing harmful inflammation, while larger particles tend to physically damage tissue barriers and trigger immune responses, both of which can lead to problems in the gut, liver, kidneys, and brain. This matters because it suggests that not all plastic pollution poses the same health risk, and understanding these differences could help scientists develop targeted treatments (like special probiotics or natural compounds) to protect
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.
Unveiling the gut’s plastic predicament: How micro- and nano-plastics drive distinct toxicological pathways in Enchytraeus crypticus
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Researchers exposed the soil invertebrate Enchytraeus crypticus to environmentally relevant concentrations of polystyrene microplastics (50 µm) and nanoplastics (100 nm), finding that nanoplastics caused greater gut microenvironment disruption and more severe biotoxicity than microplastics, acting through distinct mechanistic pathways.
Nano-plastics and gastric health: Decoding the cytotoxic mechanisms of polystyrene nano-plastics size
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Researchers examined how different sizes of polystyrene nanoplastics affect human stomach cells in the laboratory. They found that smaller nanoplastics were more readily taken up by the cells and caused greater damage, including increased oxidative stress and reduced cell survival. The study suggests that nanoplastic particle size plays a critical role in determining their potential impact on gastrointestinal health.
Effect of microplastics and nanoplastics in gastrointestinal tract on gut health: A systematic review.
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This systematic review of 30 in vitro studies found that microplastics and nanoplastics cause size- and concentration-dependent damage to human gastrointestinal cells, including increased oxidative stress, mitochondrial dysfunction, inflammation, and apoptosis. Smaller particles consistently showed greater cellular uptake and biological effects, though chronic low-dose exposure generally produced minimal impacts.
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