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Effects of combined exposure to two bisphenol plasticizers (BPA and BPB) on Xenopus laevis development
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This study investigates the reproductive toxicity of combined exposure to bisphenol A (BPA) and bisphenol S (BPS), two common plasticizers found in consumer products. Results suggest that co-exposure can produce additive or synergistic effects on reproductive health outcomes, raising concerns about real-world multi-bisphenol exposure scenarios.
Due to its endocrine disruptive activity, the plastic additive Bisphenol A (BPA) is classified as substance of very high concern (EU ECHA 2017). A correlation between environmental exposure to BPA and congenital defects has been described in humans and in experimental species including the amphibian Xenopus laevis, where severe branchial defects were associated to lethality. The exposure of X. laevis embryos to the BPA analogue bisphenol B (BPB) was recently linked to similar teratogenic effects, with BPB having relative potency about 3 times higher than BPA. The combined BPA-BPB exposure is realistic as both BPA and BPB are detected in human samples and environment. Limited experimental data are available on the combined developmental toxicity of BPA and BPB. The aim of the present work is to evaluate the effects of BPA and BPB mixture in the X. laevis development model, using R-FETAX procedure. The exposure was limited to the first day of development (corresponding to the phylotypic developmental period, common to all vertebrates). Samples were monitored for lethal effects during the full six-day test period and the external morphology was evaluated at the end of the test. Mixture effects were described by modelling, using the PROAST software package. Overall data modelling showed that dose-addiction could not be rejected, suggesting a health concern for co-exposure.
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Researchers tested the single and combined effects of the pesticide deltamethrin and polyethylene microplastics on the African clawed frog during early development. While microplastics alone did not cause visible malformations or mortality, they altered biochemical enzyme activities and, when combined with the pesticide, produced complex interaction patterns including both additive and antagonistic effects. The study suggests that microplastic co-exposure can modify how aquatic organisms respond to pesticide toxicity.
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Exposure to polyethylene microplastics caused concentration-dependent increases in mortality, malformations, and oxidative stress biomarkers in Xenopus laevis frog embryos and larvae across environmentally relevant concentrations. These embryotoxic and teratogenic effects in a widely used model organism reinforce concerns about PE microplastics as a developmental hazard in aquatic ecosystems.
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Scientists exposed frog embryos to microplastics and heavy metals like cadmium, copper, and lead—both alone and combined—to see how these common water pollutants affect development. They found that the combo caused more harm than either pollutant alone, leading to birth defects, cell damage, and disrupted genes needed for healthy growth. While this study was done in frogs, it's a warning sign: microplastics may make other pollutants more dangerous, which matters since both are widespread in our water and food supply.
Combined Toxicities of Di-Butyl Phthalate and Polyethylene Terephthalate to Zebrafish Embryos
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Researchers exposed zebrafish embryos to polyethylene terephthalate microplastics and the plasticizer di-butyl phthalate, both alone and in combination. While the microplastics alone mainly delayed hatching, the plasticizer caused severe developmental abnormalities and death. The study found that the microplastics actually reduced the toxicity of the plasticizer by adsorbing it, though they also slowed its breakdown, creating a more persistent exposure risk.
Synergistic endocrine disruption and cellular toxicity of polyethylene microplastics and bisphenol A in MLTC-1 cells and zebrafish
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When zebrafish and testicular cells were exposed to polyethylene microplastics and the chemical bisphenol A (BPA) together, the combination caused significantly worse reproductive harm than either pollutant alone, including reduced cell survival and disrupted hormone-producing gene activity. This matters because people are commonly exposed to both microplastics and BPA through food packaging, and their combined effect on reproductive health may be greater than expected.
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