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Joint cadmium and polypropylene microparticle action in cadmium tolerant model insect
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Researchers found that polypropylene microfibers increased cadmium accumulation in cadmium-tolerant moth larvae (Spodoptera exigua) but did not independently alter key biomarkers, suggesting that multigenerational cadmium exposure may confer cross-tolerance that buffers insects against the added stress of microplastic co-exposure.
Microplastic enlisted as a contaminant of emerging concerns in polluted environments interact with "traditional" contaminants such as metals, causing, among others, their increased accumulation in the body. Harmful effects depend on the exposed animals' possible preadaptation and/or cross-tolerance. The project aimed to assess the role of this phenomenon in the limited toxicity of polypropylene fibers (PPf) in 0%, 0.02%, 0.06, 0.18%, 0.54%, and 1.6% of Cd-supplemented food of larvae of Spodoptera exigua multigenerationally selected to cadmium tolerance. The activity of 20 digestive enzymes (API-ZYM test), defensins, and heat shock proteins, HSP70 levels in the exposed groups were used as biomarkers. PPfs caused the increase of Cd accumulation in the body, while intake of polypropylene microfibers did not change the biomarker levels. Moreover, multigenerational Cd pre-exposure, due to increased tolerance of Cd and, possibly, cross-tolerance, prepares the insects for an additional stressor (PPf) alone and in interaction with cadmium.
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Researchers examined how polyethylene microplastics altered cadmium toxicity to Daphnia magna, finding that microplastic co-exposure modified cadmium bioavailability and affected survival, growth, feeding rates, and reproductive outcomes in this ecologically important species.
Interactions of Ingested Polystyrene Microplastics with Heavy Metals (Cadmium or Silver) as Environmental Pollutants: A Comprehensive In Vivo Study Using Drosophila melanogaster
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Researchers used Drosophila larvae to study polystyrene microplastic interactions with cadmium and silver, visualizing plastic passage through the intestinal barrier into hemolymph and finding that co-exposure to metals and microplastics produced synergistic toxic effects.
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Scientists examined how polyethylene microplastics adsorb cadmium and then tested the combined effects on the water flea Moina monogolica over 21 days, finding that cadmium-laden microplastics caused greater reproductive and developmental harm than either stressor alone.
Parental co-exposure to polystyrene nanoplastics and cadmium primes adaptive intergenerational responses in Arabidopsis thaliana
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Plants exposed to both nanoplastics and cadmium (a toxic heavy metal) before reproducing actually "prepared" their offspring to better handle the same pollution—young plants adjusted how they absorbed and stored the metal to reduce damage. This matters because as microplastics and heavy metals increasingly contaminate soil together, understanding how crops adapt (or struggle) across generations could affect food safety and the levels of contaminants that end up on our plates.
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Researchers exposed earthworm immune cells (coelomocytes) to polystyrene nanoplastics combined with the heavy metal cadmium, finding that nanoplastics act as carriers that amplify cadmium uptake and worsen oxidative stress, energy metabolism disruption, and enzyme damage beyond what cadmium causes alone.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.