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A comparative study on juvenile Rockfish exposed to fragmented and fibrous PET(Polyethylene Terephthalate) microplastics
Summary
This study compared the toxic effects of fragmented versus fibrous PET microplastics on juvenile rockfish through oral administration, examining apoptosis and immune cell activity after 72 hours. Results showed that particle shape influences the magnitude and nature of toxic responses in marine fish.
Although the hazards of environmental microplastics (MPs) are well known, it is unclear which of their characteristics have the greatest effects on marine. We investigated the toxic effects of oral administration according to physical properties, including the shape of fragmented polyethylene terephthalate (PET) (FrPET) and fibrous PET (FiPET). After 72 h of exposure, apoptosis and phagocytic activity varied significantly among juvenile rockfish (Sebastes schlegeli) exposed to both FrPET and FiPET. The levels of immune-related genes and hepatic metabolic activity also increased after exposure to both shapes of MPs, but the variation in responses was greater in fish exposed to FiPET compared with those exposed to FrPET. The transcriptomic and metabolomics analysis results indicated that the maintenance and homeostasis of immune systems was affected by oral exposure to FrPET and FiPET. The amino acid metabolic processes were identified in rockfish exposed to FrPET, but the notch signaling pathway were evident in the FiPET exposure group. Metabolomics analysis revealed that oral ingestion of MP fibers led to a stronger inflammatory response and greater oxidative stress in juvenile rockfish. These results can be used to understand environmentally dominant MP toxic effects such as type, size, shapes, as well as to prioritize ecotoxicological management. Also see: https://micro2024.sciencesconf.org/542251/document
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