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Simulated Environmental Nanoplastics Induce Zebrafish Developmental Toxicity and Stress Response
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Scientists exposed zebrafish embryos to nanoplastics that were specially broken down to mimic how plastic actually degrades in oceans and rivers, and found they caused more harm than the lab-made plastic beads typically used in research, stunting growth, slowing hatching, and triggering stress hormone spikes even at very low doses. Because these effects showed up at concentrations similar to what's found in real water sources, the findings suggest current safety testing may be underestimating the risks nanoplastics pose to both aquatic life and, potentially, to people who drink that water or eat seafood from it.
High Resolution Image Download MS PowerPoint Slide Nanoplastics (NPs) pose emerging risks to both the environment and human health. In this study, we use a zebrafish in vivo model to study─and compare─the physicochemical and toxicological effects of two distinct polystyrene NPs: widely used commercial polymeric nanobeads and nanoscale simulated environmental plastics (SEPs) engineered using a top-down accelerated weathering protocol. Zebrafish embryos and larvae exposed to NPs were assessed for changes in development, growth, locomotor activity, and stress and hypoxic responses. SEP─besides being more environmentally relevant than the commercial nanobeads─significantly delayed hatching and reduced body length (up to 150 μm shorter) compared to the minor effects of the nanobeads at the same concentrations. Moreover, SEPs impaired locomotor activity (40% reduction in distance traveled) and triggered a dose-dependent stress response, increasing cortisol levels (2–3 fold) and upregulating stress and hypoxia-related genes. The stress-related condition induced by SEP exposure, observed throughout the study, involved alterations in the hypothalamic-pituitary-adrenal-interrenal (HPA/HPI) axis, particularly in glucocorticoid signaling (i.e., cortisol), which plays a crucial role in regulating stress responses and developmental processes. These alterations could potentially influence the development and adult life of living organisms, including the onset of associated pathologies. Furthermore, these findings underscore significant ecological and health risks, as even low concentrations of NPs in aquatic ecosystems may impair fish populations and biodiversity while also presenting potential human health hazards through the contamination of water sources and seafood. Notably, all reported effects occurred at a relatively low concentration (0.1 μg/L), emphasizing the need for rigorous NP risk assessment and the importance of selecting an appropriate and environmentally relevant experimental model.
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Researchers reviewed evidence from cell and animal studies on the toxic effects of micro- and nanoplastics, finding that these particles can cause inflammation, oxidative stress, and organ damage in laboratory models, raising concern about what chronic low-level human exposure might mean for long-term health.
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This review synthesizes evidence on how micro- and nanoplastics cause developmental, reproductive, gastrointestinal, and oxidative stress toxicity in zebrafish, positioning the species as a valuable vertebrate model for understanding plastic pollutant effects across trophic levels. Zebrafish research is accelerating mechanistic understanding of how microplastics harm vertebrate biology, providing insights relevant to assessing risks for fish-eating wildlife and humans.
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