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Single and mixtures toxicity of emerging (polystyrene nanoplastic) and persistent (PAHs and PCBs) pollutants and their sub-lethal adverse effects on larval stage zebrafish (Danio rerio)
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Scientists exposed baby zebrafish to common pollutants—like those from car exhaust and old industrial chemicals—both alone and combined with tiny plastic particles (nanoplastics) to see how they affect developing bodies. While nanoplastics alone caused no harm, combining them with these pollutants made things worse: fish had to work harder to process toxins and showed reduced blood flow to the heart. This suggests that in the real world, where we're exposed to plastic pollution alongside other chemicals at the same time, the combined effects on health could be more serious than looking at any single pollutant alone.
Persistent organic pollutants (POPs) such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), with emerging contaminants such as nano-microplastics, continue to raise concerns for both wildlife and human health. This study evaluated the sub-lethal effects of environmentally relevant concentrations of single and mixtures of PAHs, PCBs, in co-exposure with polystyrene (PS) nanoplastics during the early life stages of zebrafish (Danio rerio). Larvae (n = 25/treatment) were exposed from 2 to 5 days post-fertilization (dpf) in semi-static renewal conditions in temperature (28 ± 1 °C) controlled aquaria. Mixtures of PAHs and PCBs triggered in vivo cytochrome P450 (CYP450) biotransformation activity, which aligned with increases in mass-specific metabolic (oxygen consumption) rate (MO₂). This elevation in MO₂ suggests a heightened requirement for molecular oxygen, likely supporting CYP450-mediated mono‑oxygenation pathways. Exposure to PS nanoplastics alone (0.1 μm beads at 10 μg/L) did not significantly alter any measured endpoints. In contrast, co-exposure of PS nanoplastics with either phenanthrene (PHE) or PCB 81 produced 70% and 57% increases in MO₂, respectively. Significant reductions in cardiac blood flow were detected in larvae exposed to PCB 18 + PS, PCB 81 + PS, and PCB 105 + PS, indicating that PCBs co-exposure with PS were the primary contributors to the observed cardiovascular impairments rather than PS nanoplastics alone. Collectively, these results emphasize the value of studying multivariate sub-lethal effects of persistent contaminants (PAHs, PCBs) and emerging pollutants such as nanoplastics in various environmentally relevant concentration mixtures to understand contaminant toxicity.
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Effects of micro/nanoplastics combined with three anthropogenic chemicals on larval zebrafish (Danio rerio): study of toxicity, behaviour and assessment of uptake
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Scientists found that tiny plastic particles alone didn't harm baby zebrafish, but when combined with common chemicals found in flame retardants and antidepressants, the plastics made those chemicals more toxic. This suggests that in the real world, where we're exposed to plastic particles and chemicals together, the combination could be more harmful than either one alone—even though this study was in fish, it raises questions about how plastic pollution might amplify chemical risks for humans too.
Developmental toxicity and mechanism of polychlorinated biphenyls 126 and nano-polystyrene combined exposure to zebrafish larvae
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Researchers exposed zebrafish embryos to a combination of a toxic industrial chemical (PCB126) and nanoplastics and found that the mixture caused more severe developmental problems than either pollutant alone. The nanoplastics appeared to increase the absorption and toxic effects of PCB126, leading to greater heart defects and developmental abnormalities. The study suggests that nanoplastics may worsen the impact of existing chemical pollutants on aquatic life.
Nanoplastics Decrease the Toxicity of a Complex PAH Mixture but Impair Mitochondrial Energy Production in Developing Zebrafish
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Researchers studied the combined toxicity of polystyrene nanoplastics and a real-world mixture of polycyclic aromatic hydrocarbons on developing zebrafish. While the nanoplastics alone did not cause visible developmental defects, they impaired mitochondrial energy production and unexpectedly reduced the toxicity of the PAH mixture. The findings suggest that nanoplastics can interact with co-occurring pollutants in complex ways, sometimes moderating their effects while causing their own subtle cellular damage.
Combined effects of microplastics and benz[a]anthracene on cardiotoxicity in zebrafish (Danio rerio) larvae: Size matters
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Researchers used zebrafish larvae to investigate how microplastic particle size affects the combined toxicity of polystyrene microplastics and the carcinogen benz[a]anthracene. The study found that small microplastics (0.2 micrometers) enhanced the toxic effects of the pollutant, causing cardiac defects and blood vessel disruption, while larger particles (10 micrometers) had antagonistic effects, demonstrating that microplastic size plays a critical role in determining combined pollutant toxicity.
Enhanced neurotoxic effect of PCB-153 when co-exposed with polystyrene nanoplastics in zebrafish larvae
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Researchers found that when zebrafish larvae were exposed to both polystyrene nanoplastics and the toxic chemical PCB-153 together, the neurological damage was significantly worse than from either pollutant alone. The combined exposure caused hyperactive swimming behavior and suppressed immune, brain, and detoxification pathways at the genetic level. This is concerning because nanoplastics and persistent organic pollutants frequently co-exist in the environment, meaning their real-world health effects on aquatic life and humans may be greater than studies of single pollutants suggest.
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