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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.
Microplastics (MPs) are currently an environmental concern and pose risk to both aquatic ecosystem and human health. Despite the different studies that evaluated MPs’ toxic effects, alone or combined with other chemicals, on aquatic species, many gray areas on...
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Single and combined acute and subchronic toxic effects of microplastics and copper in zebrafish (Danio rerio) early life stages
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Researchers exposed zebrafish embryos and larvae to microplastics, copper, and their combinations to assess individual and combined toxic effects. They found that microplastics alone caused limited harm, but when combined with copper, the mixture produced altered biochemical responses and changes in gene expression. The study suggests that microplastics can modify the toxicity of heavy metals in aquatic organisms during early development.
Long-term effects of individual and combined exposure to microplastics and copper in zebrafish hypothalamic-pituitary-gonadal axis – A multi-biomarker evaluation
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This study exposed zebrafish to microplastics, copper, and both combined for 30 days and examined effects on their reproductive system. The combination of microplastics and copper caused greater hormonal disruption and oxidative stress than either pollutant alone, affecting genes that control reproduction in both male and female fish. These findings suggest that microplastics interacting with metal pollution in waterways could compound reproductive harm in aquatic organisms and potentially in humans who consume contaminated fish.
The Effects of Single and Combined Exposure to Polystyrene Nanoplastics and Copper on the Behavior of Adult Zebrafish
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Researchers studied how polystyrene nanoplastics and copper ions affected zebrafish behavior when the fish were exposed to both pollutants simultaneously. The combination was more toxic than either pollutant alone, reducing the concentration needed to kill fish by up to 32%. Since nanoplastics and heavy metals commonly occur together in polluted water, their combined effects on aquatic life could increase the risks associated with consuming contaminated fish.
Additive effects of microplastics on accumulation and toxicity of cadmium in male zebrafish
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Researchers exposed adult zebrafish to polyethylene microplastics and cadmium, both individually and in combination, for 21 days. They found that microplastics and cadmium together produced additive toxic effects, increasing cadmium accumulation in fish tissues, altering behavior, and causing more severe organ damage. The study suggests that microplastics in contaminated waterways may worsen the harmful effects of heavy metals on aquatic life.
Combined Effects of Microplastics and Heavy Metals, Pesticides, and Antibiotics in Zebrafish ( Danio rerio ): A Critical Review
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This review of 86 zebrafish studies found that most research on microplastics mixed with metals, pesticides, or antibiotics lacks strong evidence to prove whether these combos make toxic effects worse or better. Microplastics can carry chemicals into the body or release them, but scientists still can't reliably predict which effect wins, meaning real-world health risks from combined exposures remain uncertain.
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