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TPhP and nanoplastics impair color preference in adult fish
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A common flame retardant chemical (TPhP), found in furniture, electronics, and other everyday products, damaged zebrafish eyes and messed up their ability to tell colors apart, and surprisingly, adding nanoplastics to the mix didn't make things worse, but instead changed how the damage played out at a molecular level. While this study was done in fish, it's a reminder that flame retardants and plastic pollution are showing up together in water sources, and we still don't fully understand how these chemicals interact once they're combined in the body, a question that matters as scientists continue investigating human exposure to both.
Organophosphate ester flame retardants and nanoplastics (NPs) frequently co-occur in aquatic environments; however, their combined effects on fish visual function remain poorly understood. Here, we investigated whether NPs modulate triphenyl phosphate (TPhP)-induced ocular toxicity and color-guided behavior in zebrafish. Fish were exposed to environmentally relevant concentrations of TPhP, NPs, or their mixture (TNP), followed by color preference assays, retinal histopathology, apoptosis analysis, and eye-tissue transcriptomics with targeted gene validation. TPhP exposure significantly disrupted green and red color preferences and altered color-dependent spatial distribution. These behavioral deficits were accompanied by retinal structural damage, including thinning of the inner neuronal and photoreceptor layers, downregulation of opsin-related genes, and increased apoptosis. In contrast, these alterations were partially attenuated under co-exposure conditions. Transcriptomic analyses further revealed distinct molecular signatures under single exposures; TPhP predominantly affected pathways associated with retinal structure, energy metabolism, and junctional integrity, whereas NPs primarily activated inflammation- and cell death-related processes. Co-exposure elicited a broader and more complex transcriptional response, characterized by coordinated reprogramming of immune-inflammatory, metabolic, tight junction, and regulated cell death pathways, suggesting a non-additive interaction between TPhP and NPs. Collectively, these findings demonstrate that NPs reshape TPhP-induced ocular toxicity through complex transcriptional reprogramming rather than simply enhancing or alleviating individual toxic effects. This study highlights the importance of considering mixture-induced molecular adaptation when evaluating the ecological risks of emerging contaminants and supports color-guided behavior as a sensitive endpoint for assessing visual toxicity in aquatic organisms.
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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.
Detrimental effects of individual versus combined exposure to tetrabromobisphenol A and polystyrene nanoplastics in fish cell lines
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Researchers tested how combined exposure to the flame retardant tetrabromobisphenol A and polystyrene nanoparticles affects freshwater fish cells. They found that co-exposure to even low concentrations of both pollutants caused subtle changes in cell viability and generated oxidative DNA damage. The study suggests that the interaction between nanoplastics and chemical pollutants in aquatic environments may pose compounding risks to fish health.
Enhanced toxicity of triphenyl phosphate to zebrafish in the presence of micro- and nano-plastics
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Co-exposure of zebrafish to triphenyl phosphate (TPhP) with micro- or nano-polystyrene showed that nano-PS (46 nm) aggravated TPhP-induced liver and gonad enlargement, while micro-PS had minimal effect — suggesting nanoplastics can enhance the toxicity of organophosphate flame retardants.
Nanoplastics aggravated TDCIPP-induced transgenerational developmental neurotoxicity in zebrafish depending on the involvement of the dopamine signaling pathway
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Zebrafish exposed to nanoplastics combined with TDCIPP (a common flame retardant chemical) from embryo to adulthood showed more severe brain development problems than exposure to either pollutant alone. The nanoplastics increased the absorption of the flame retardant and together they disrupted the dopamine signaling pathway in the brain, with toxic effects carrying over to the next generation. This highlights how nanoplastics can amplify the neurotoxicity of other environmental chemicals.
Quantifying the Amplification of Organophosphate Ester-Induced Visual Risk by Nanoplastics Considering Dual Mechanisms of Vector Effects and Efflux Inhibition
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Researchers quantified how nanoplastics amplify the visual toxicity of the flame retardant TDCIPP in zebrafish through two mechanisms: acting as a physical carrier that increases pollutant delivery to tissues, and inhibiting cellular efflux systems that normally expel toxins. They developed a quantitative model to predict the combined risk under realistic environmental conditions. The study reveals that nanoplastics can significantly worsen the harmful effects of co-occurring chemical contaminants through multiple biological pathways.
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