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Toxicological effects of polypropylene microplastics and co-exposure with arsenic in Drosophila melanogaster.
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Scientists tested how tiny plastic particles (like those found in food packaging) affect fruit flies, both alone and combined with a form of arsenic, a toxic substance sometimes found in water and soil. On their own, the plastics caused some tissue damage but didn't hurt survival or reproduction—however, when combined with arsenic, the mix led to more birth defects and fertility problems, suggesting these two pollutants can interact in unexpected ways. This matters because it hints that real-world exposure to multiple contaminants together—not just one at a time—could pose greater risks to health than we'd predict from studying them separately.
Microplastics (MPs) are particles smaller than 5 mm that, due to their physicochemical properties, can act as carriers for contaminants such as heavy metals. In this study, we evaluated the toxicological effects of polypropylene microplastics (PP-MPs) and their co-exposure with dimethylarsinic acid (DMA) in the model. Third-instar larvae were exposed to the following experimental groups: negative control, positive control (0.02% HO), cosolvent control (ethanol, 6.94% final concentration), PP-MPs (0.01 g/mL), DMA (0.5 mM), and the co-exposure group (PP-MPs + DMA). Larval-to-adult viability, morphology, tissue damage, and fecundity were assessed. PP-MPs alone did not significantly affect larval-to-adult viability, the incidence of morphological abnormalities, or fecundity; however, evidence of tissue damage was observed. In contrast, co-exposure suggested an antagonistic effect on larval-to-adult viability and tissue damage, while indicating a synergistic effect on fecundity and the incidence of abnormalities. These findings contribute to a better understanding of the biological effects associated with co-exposure to microplastics and arsenic in an model.
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Behavior, mechanisms and hazardous changes of interactions with microplastics when heterogeneous pollutants coexist: Arsenic and thiram
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Researchers studied how six types of microplastics interact with arsenic and the pesticide thiram when these pollutants coexist. They found that both contaminants adsorb onto microplastics through physical diffusion and chemical processes in a competitive and synergistic manner. While the adsorbed pollutants did not significantly increase acute environmental toxicity, the study suggests they may pose a stronger potential hazard to human health.
Effects of microplastics and arsenic on plants: Interactions, toxicity and environmental implications
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This review examines how microplastics and arsenic interact in soil and their combined effects on plant health. When both pollutants are present together, they can have amplified toxic effects on plants, affecting growth, nutrient uptake, and stress responses. Since plants absorb these contaminants from soil, the interaction between microplastics and arsenic could increase human exposure to both pollutants through food crops.
The combined toxic effects of polystyrene microplastics and different forms of arsenic on the zebrafish embryos (Danio rerio)
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Researchers studied how polystyrene microplastics interact with different forms of arsenic and their combined effects on zebrafish embryos. The microplastics absorbed arsenic from the water and altered how the toxic metal accumulated in zebrafish tissues, changing its toxicity profile. The findings suggest that microplastics in the environment can modify how other pollutants affect living organisms, potentially making combined exposures more harmful than expected.
Microplastic particles increase arsenic toxicity to rice seedlings
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Researchers studied how polystyrene and polytetrafluoroethylene microplastics interact with arsenic to affect rice seedling growth. They found that microplastics alone reduced plant biomass and inhibited photosynthesis, while the combination with arsenic at higher concentrations amplified the toxic effects on root activity and cell membranes. The study reveals that microplastic contamination in agricultural settings may worsen the impact of other pollutants on food crops.
Multi-omics Analysis Uncovers Lifespan Effects of Polyethylene and Polystyrene Microplastics Coexposure in Drosophila melanogaster
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Researchers used fruit flies (Drosophila) to investigate the combined effects of polyethylene and polystyrene microplastics on lifespan. They found that co-exposure at high concentrations significantly reduced lifespan and impaired climbing ability, intestinal barrier function, and hunger resistance. Multi-omics analysis revealed disruptions in metabolic pathways and immune signaling, suggesting that combined microplastic exposure may be more harmful than single-type exposure alone.
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