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Influence of polyethylene microplastic beads on the uptake and localization of silver in zebrafish (Danio rerio)
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Researchers examined whether polyethylene microplastic beads affected the uptake and localization of silver in zebrafish. The study found that the presence of microplastic beads at various concentrations had no significant effect on silver uptake or distribution in the fish, suggesting that microplastics may not always enhance metal bioavailability under the tested conditions.
This study aimed to determine whether the uptake and localization of Ag in zebrafish was affected by the presence of polyethylene microplastic beads (PE MPBs). Zebrafish were exposed to 1 μg Ag L(-1) (radiolabelled with (110m)Ag) for 4 and 24 h in the presence or absence of PE MPBs (10, 100 or 1000 MPBs mL(-1)), and one treatment in which MPBs (1000 MPBs mL(-1)) were incubated with Ag to promote adsorption. The presence of MPBs, at any of the tested doses, had no effect on the uptake or localization of Ag. However, exposure to the Ag-incubated MPBs (∽75% of the Ag bound to MPBs) significantly reduced Ag uptake at both time points and also significantly increased the proportion of intestinal Ag. This study demonstrates that microplastics can alter the bioavailability and uptake route of a metal contaminant in a model fish species.
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Do polyethylene microplastic beads alter the intestinal uptake of Ag in rainbow trout (Oncorhynchus mykiss)? Analysis of the MP vector effect using in vitro gut sacs
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Researchers used isolated rainbow trout gut sac preparations to test whether polyethylene microplastics alter silver absorption in the intestine, finding that the presence of MPs did not change silver distribution across gut tissue compartments — likely because silver desorbs from plastic surfaces in the acidic stomach before reaching the intestinal absorption site.
Influence of microplastics on the bioconcentration of organic contaminants in fish: Is the “Trojan horse” effect a matter of concern?
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Researchers tested whether microplastic ingestion increases the bioconcentration of hydrophobic organic chemicals in zebrafish, examining the so-called 'Trojan horse' effect. They found that exposure to contaminated polyethylene microplastics did not significantly increase chemical accumulation in fish compared to waterborne exposure alone. The study suggests that for these chemicals, direct water exposure remains the dominant uptake pathway, and the microplastic carrier effect may be less concerning than previously thought.
Determination of Bisphenol Compounds and the Bioaccumulation after Co-Exposure with Polyethylene Microplastics in Zebrafish
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Researchers developed a method to measure how bisphenol A and bisphenol S accumulate in zebrafish tissues when microplastics are also present. They found that microplastics increased the accumulation of these hormone-disrupting chemicals in fish tissues, with BPA building up more than BPS. The evidence indicates that microplastics can act as carriers that enhance the uptake of harmful chemicals by aquatic organisms.
Polystyrene microplastics inhibit the neurodevelopmental toxicity of mercury in zebrafish (Danio rerio) larvae with size-dependent effects
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Researchers found that polystyrene microplastics paradoxically reduced mercury neurotoxicity in zebrafish larvae, with nanoscale particles providing greater protection than microscale ones by decreasing mercury bioavailability and oxidative damage.
Neurobehavioral and neurochemical effects of nano-sized polypropylene accumulation in zebrafish (Danio rerio)
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Researchers exposed zebrafish to polypropylene nanoparticles and confirmed the particles accumulated in brain tissue using advanced imaging and chemical analysis. The accumulation led to measurable neurotoxic effects, including reduced movement activity and disrupted neurotransmitter levels. The study suggests that nanoscale polypropylene, one of the most commonly produced plastics, may pose risks to nervous system function in aquatic organisms.
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