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Gill dysfunction and metabolic disruption: the size-dependent effects of microplastics on Chiromantes haematocheir
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Scientists exposed crabs to tiny plastic particles of different sizes and found that the smallest particles (75 nanometers, far tinier than a human cell) caused the most damage to their gills, disrupting energy production, triggering cell death, and overwhelming the crabs' natural defenses. This matters because it suggests that as plastics break down into smaller and smaller pieces in the environment, they may actually become more harmful to living organisms — a concerning trend given that these same tiny plastic particles are increasingly found in the seafood and water humans consume.
Plastic particles are emerging aquatic pollutants, but their size-associated effects on crab gill toxicity remain unclear. In this study, Chiromantes haematocheir was exposed to polystyrene particles of 75 nm, 500 nm, and 1000 nm for 21 days to evaluate gill accumulation, oxidative stress, immune response, energy metabolism, and apoptosis. Polystyrene particles accumulated in the gills and induced tissue injury and apoptotic cell death, with PS75 causing the most severe damage. Biochemical assays showed that PS exposure disturbed glycolytic enzyme activities, antioxidant defence, and immune-related indicators. Transcriptomic analysis further revealed that different particle sizes affected pathways related to glycolysis, oxidative phosphorylation, mitochondrial electron transport, antioxidant response, immune regulation, and apoptosis. PS75 induced the strongest metabolic reprogramming, oxidative stress, and apoptotic activation, whereas PS1000 showed stronger compensatory antioxidant and mitochondrial responses. Overall, these results indicate that polystyrene particles induce size-associated gill toxicity in C. haematocheir, with smaller particles causing greater physiological and molecular disruption.
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Gill dysfunction and metabolic disruption: the size-dependent effects of microplastics on Chiromantes haematocheir
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Researchers exposed the brackish-water crab Chiromantes haematocheir to polystyrene particles at three sizes (75 nm, 500 nm, 1000 nm) for 21 days and found that smaller particles caused greater gill accumulation, elevated oxidative stress, and more pronounced disruption of immune function, energy metabolism, and apoptotic pathways.
Gill dysfunction and metabolic disruption: the size-dependent effects of microplastics on Chiromantes haematocheir
AI summary Read the abstract
Researchers exposed the brackish-water crab Chiromantes haematocheir to polystyrene particles at three sizes (75 nm, 500 nm, 1000 nm) for 21 days and found that smaller particles caused greater gill accumulation, elevated oxidative stress, and more pronounced disruption of immune function, energy metabolism, and apoptotic pathways.
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This study exposed crabs to nanoplastics of different sizes and concentrations and found significant harm to their gut health, including disrupted gut bacteria, reduced digestive enzyme activity, increased cell death, and inflammation. The smallest nanoplastics (75 nm) were most likely to promote harmful bacteria and trigger cell death, while medium-sized particles (500 nm) caused the strongest inflammatory response. These findings are relevant to human health because they demonstrate how nanoplastics disrupt gut function, which is a concern given that humans also ingest nanoplastics through food and water.
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Researchers exposed mussels to five different size classes of polyethylene microplastics and found that the smallest particles (20-50 micrometers) caused the most biological damage, including immune system changes and increased oxidative stress. The study provides experimental evidence that microplastic size matters significantly when assessing health risks. This is important for human health assessments because it suggests that the smallest microplastic particles, which are also the hardest to filter out of food and water, may be the most harmful.
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