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Nanoplastics-induced hormesis enhances cadmium bioaccumulation in nematodes by stimulating glutathione synthesis
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Researchers found that tiny nanoplastics can amplify the buildup of the heavy metal cadmium in worms, not by directly carrying the metal but by triggering a biological stress response that doubles the production of a natural detox molecule called glutathione. The glutathione binds to cadmium and traps it in gut tissues, increasing accumulation by up to 71%. This suggests nanoplastics may worsen the risks of heavy metal pollution in unexpected ways.
Nanoplastics (NPs) induce hormesis at environmental concentrations due to their relatively low toxicity; however, this phenomenon can alter the response of biota to coexisting heavy metals, resulting in unknown combined risks. In this study, we investigated the joint effects of cadmium (Cd) and four polystyrene nanoplastics (PS-NPs) with different sizes (100 nm and 500 nm) and surface modifications (-NH and -COOH) on Caenorhabditis elegans, focusing on how NPs-induced bioresponses contribute to Cd accumulation in nematodes. Different from traditional views, the results show that NPs enhance Cd accumulation primarily through hormesis rather than direct adsorption. Coexposure with the four PS-NPs significantly increased Cd bioaccumulation by 1.33-1.71-fold compared to Cd-alone treatments, attributed to elevated storage of glutathione (GSH)-Cd complexes in gut granules. Transcriptomic and metabolomic analyses revealed a 14.0-20.6 % upregulation of metal-response molecules, driven by activation of sulfur-containing amino acid metabolism pathways. These molecular bioresponses doubled GSH synthesis, promoting GSH-Cd complexation and Cd accumulation. Our findings underscore the overlooked role of NPs-induced hormesis in amplifying heavy metal bioaccumulation and associated risks.
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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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Researchers discovered that nanoplastics act as a "Trojan horse" by carrying cadmium (a toxic heavy metal) into liver cells and then releasing it inside, amplifying cadmium's toxicity by over 23%. The combined exposure triggered more severe inflammation and cell death than either pollutant alone, demonstrating how nanoplastics can make other environmental contaminants more dangerous to human health.
Polystyrene nanoplastics at predicted environmental concentrations enhance the toxicity of copper on Caenorhabditis elegans
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Even at low concentrations found in the environment, polystyrene nanoplastics significantly increased copper toxicity in roundworms by boosting oxidative stress and triggering stress-response genes. The nanoplastics alone did not cause obvious harm, but when combined with copper, the damage was much worse than copper alone. This is concerning because in real-world soil and water, nanoplastics and heavy metals often occur together, potentially creating greater health risks than either pollutant individually.
Mechanistic insights into polystyrene micro/nanoplastics-facilitated cadmium trophic transfer and aggravated toxicity along a lettuce-snail terrestrial food chain
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Researchers investigated how polystyrene micro- and nanoplastics affect cadmium transfer through a lettuce-snail food chain and found that the plastics significantly increased cadmium availability in soil and its accumulation in lettuce leaves. Co-exposure caused amplified toxicity in snails, including greater oxidative stress, intestinal damage, and gut barrier dysfunction, demonstrating that microplastics can worsen the effects of heavy metal contamination in terrestrial food chains.
Polystyrene nanoplastics distinctly impact cadmium uptake and toxicity in Arabidopsis thaliana
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In a study using the model plant Arabidopsis, polystyrene nanoplastics increased the uptake and accumulation of the toxic heavy metal cadmium in plant roots. The combined stress of nanoplastics and cadmium caused worse oxidative damage and growth problems than either pollutant alone. This is concerning because it means microplastics in agricultural soil could help toxic metals get into crops more easily, potentially increasing human exposure through food.
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