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Fragmented polystyrene and polyethylene microplastics modulate brain antioxidant defences and behaviour in adult zebrafish under Copper Co-exposure
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Scientists exposed zebrafish to tiny plastic fragments (from common plastics like polystyrene and polyethylene) and copper, a combination often found together in polluted water, and found it changed the fish's social behavior and altered protective antioxidant chemicals in their brains, though it didn't cause DNA damage. This matters because it shows that everyday pollutants like microplastics and trace metals can subtly affect brain chemistry and behavior in animals even at low doses, raising questions about what similar long-term exposure through our water and food might mean for human brain health.
Microplastics (MPs) frequently co-occur with trace metals in aquatic environments, yet their combined effects on fish neurobiology remain insufficiently understood. This study evaluated the effects of fragmented polystyrene (PS) and polyethylene (PE) MPs, alone and combined with copper (Cu), on brain redox homeostasis and behaviour in adult zebrafish (Danio rerio). Prior to exposure, both polymers were characterized by optical microscopy and scanning electron microscopy, confirming irregular fragmented morphologies and comparable particle dimensions. Adult zebrafish were exposed for 21 days to MPs of PS or PE (1 mg/L), Cu (25 μg/L), or their respective mixtures. Behavioural endpoints (shoaling, exploratory activity and anxiety-related responses) were assessed together with oxidative stress biomarkers, antioxidant enzyme activities and oxidative damage in the brain. MPs altered shoaling behaviour independently of polymer type, whereas locomotor and exploratory performance remained largely unaffected. At the biochemical level, exposure modulated antioxidant defences, including glutathione-related enzymes and glutathione S-transferase activity, indicating adjustments in redox homeostasis. Copper was the main factor influencing several redox-related endpoints, while significant interactions between MPs and Cu were restricted to selected biomarkers. Despite these biochemical responses, no evidence of DNA damage was detected under any exposure condition. Overall, the results indicate that chronic exposure to fragmented PS and PE under an experimentally defined high-end microplastics contamination scenario induced subtle behavioural alterations and modulated brain antioxidant defences in zebrafish. In contrast, the influence of Cu on these responses depends on the specific endpoint evaluated.
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The modulatory effects of polystyrene microplastics on BPA-induced DNA damage and neurotoxicity during early stages development in zebrafish
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Scientists exposed baby zebrafish to microplastics, the chemical BPA (found in some plastics), and both together to see how they affect brain development and DNA damage. Surprisingly, when the two pollutants were combined, the harmful effects were somewhat less severe than when BPA acted alone, suggesting these chemicals interact in complex, unpredictable ways rather than simply adding up. This matters because it shows we can't fully understand the health risks of plastic pollution by studying chemicals one at a time; real-world exposure to multiple pollutants together may behave differently than expected.
Biological Effects of Microplastics and Its Binary Mixture with Copper in Zebrafish Brain and Gonads
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Scientists exposed zebrafish to tiny plastic particles (microplastics) alone and combined with copper, a common water pollutant, to see how they affect the brain and reproductive organs. The study found that microplastics can cause harmful effects on their own, and when mixed with copper, the combination can be even more damaging than either substance by itself. Since zebrafish are often used to predict health risks in other animals, this research is a warning sign that everyday plastic pollution mixed with other contaminants could pose greater risks to human health than previously thought.
Combined exposure to microplastics and cetylpyridinium chloride disturbs the sociability and brain monoamine neurotransmitters in juvenile zebrafish
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Scientists exposed young zebrafish to microplastics and cetylpyridinium chloride (CPC, a germ-killing chemical found in mouthwash and other products) that often end up together in waterways, and found the combo caused fish to become less social and disrupted key brain chemicals involved in mood and behavior—effects worse than either pollutant alone. While this study was done in fish, it's a warning sign: everyday chemicals and plastic pollution may interact in ways that harm brain function more than we'd expect from testing them separately, which matters as both microplastics and antimicrobial chemicals are increasingly found in human blood
Microplastics influence size-selected zebrafish behaviour
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Scientists exposed fish to microplastics (tiny plastic particles) and found that the contamination changed how the fish behaved - making them less bold and exploratory, but causing them to eat more often. This matters because microplastics are everywhere in our environment, including in seafood we eat, and this study shows these particles can alter animal behavior in ways that might affect entire food chains. The findings help us understand how plastic pollution could be disrupting aquatic ecosystems that humans depend on for food.
Toxic effects of naturally-aged microplastics on zebrafish juveniles: A more realistic approach to plastic pollution in freshwater ecosystems
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Researchers exposed juvenile zebrafish to naturally aged polystyrene microplastics at environmentally relevant concentrations for five days. They found that the microplastics disrupted the fish's antioxidant defenses, indicating oxidative stress, and caused measurable cellular and neurological impacts. The study suggests that even short-term exposure to realistic levels of weathered microplastics can affect the health of freshwater organisms.
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