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Impacts of nanoplastics on bivalve: Fluorescence tracing of organ accumulation, oxidative stress and damage
Summary
Researchers used fluorescence tracing to track the accumulation pathways and distribution of polystyrene nanoplastics in the freshwater bivalve Corbicula fluminea. The study found that nanoplastics accumulated through multiple routes including adherence to the mantle, ingestion into the visceral mass, and respiration through the gills, and caused oxidative stress and tissue damage in multiple organs.
The outcomes of this research offer novel insights into the toxic effects of nanoparticles (i.e., nanoplastics or other nanomaterials) on the benthos. Herein, this study aimed to evaluate the accumulation pathway, distribution characteristics and potential biotoxicity of polystyrene nanoplastics in C. fluminea. The results revealed that nanoplastics could accumulate in the mantle through adherence, in the visceral mass through ingestion and in the gill through respiration. The gill, intestine and stomach were the main accumulation organs for nanoplastics. The aggregation of nanoplastics was observed in C. fluminea, which may exacerbate their biotoxicity. Moreover, oxidative stress was observed in the visceral mass, gill and mantle. Liver damage, neurotoxicity and intestinal inflammation were caused by imbalance in the antioxidation system. Analysis of IBR values showed that the visceral mass had a more effective response to oxidative stress than the gill and mantle after exposure to nanoplastics.