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Microplastic and Car Tire Particles: A Genotoxicity Evaluation in European Perch Perca fluviatilis (Linnaeus, 1758)
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Scientists exposed fish to microplastics and tiny bits of car tire debris (which wash into waterways from road runoff) for several months and found that the combination caused DNA damage and abnormal cell changes, especially when tire particles were added to the mix. Since people are exposed to these same materials through contaminated food and water, this research suggests car tire particles might pose a genetic health risk that hasn't gotten as much attention as plastics alone—and the two together may be worse than either one by itself.
The potential effects of microplastics (MPs) on humans and ecosystems are of great concern, and it has been reported that the ingestion of contaminated food is the main route of exposure. In the present study, Perca fluviatilis was selected as a vertebrate model to evaluate the possible cellular effects induced by five different plastic polymers and car tire debris (CT) after 4- and 7-month exposure periods. The Cytome assay was chosen to check chromatin alteration in perch’s peripheral blood. The results indicated an increase in micronuclei and cytotoxic effect in specimens co-exposed to MPs + CT for 7 months. Increases in dicentric chromosomes were observed in specimens exposed both to MPs alone and to the mixture of MPs + CT, indicating for the first time a genotoxic effect induced by CT debris in fish in terms of structural aberrations. Increases in micronucleated erythrocyte frequency assessed after 7 months only after the addition of CT debris to the mixture of MPs might suggest an aneugenic action of CT in fish. In the same groups, the higher values of frequency in 8-shaped erythrocytes also indicate possible cell cycle toxicity exerted by CT exposure. An association between total erythrocyte nuclear morphology abnormalities (ENA) and glutathione reductase activity was also found, indicating a potential involvement of oxidative processes in modulating the genotoxicity observed. The present experimental model is a useful tool to study cellular mechanisms related to both MP- and CT-induced chromatin structure alterations indicating possible interference with human health as well.
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Researchers investigated the combined toxic effects of tire microplastics and antibiotics on zebrafish, finding that co-exposure caused more severe damage than either pollutant alone. The combination disrupted liver function, triggered oxidative stress, and altered the expression of genes involved in immune response and metabolism. The study suggests that the widespread co-occurrence of tire particles and antibiotics in waterways may pose compounding risks to aquatic life.
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Scientists exposed carp (a common fish) to microplastic pollution and found it caused increasing DNA damage in their blood cells the longer and more heavily they were exposed. While this study was done in fish, not humans, it adds to growing evidence that microplastics in our water can cause genetic damage in living creatures, raising questions about what similar exposure might mean for people, since we're also consuming microplastics through food, water, and the environment.
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Tire particles from car tires wash into waterways carrying both nanoplastics and a chemical called 6PPD, and this study found that when zebrafish embryos were exposed to both together, the combo caused worse heart damage than either one alone—weaker heartbeats, cell death, and oxidative stress in developing hearts. While this research was done in fish, it highlights a growing concern: everyday pollution from tires may combine with plastics in our water in ways that are more harmful than scientists previously realized, which matters since these same particles can end up in rivers, drinking water sources, and eventually the food chain.
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Chemicals leaching from tire wear particles (tiny bits of rubber that wash off roads into waterways) caused liver damage, gut bacteria imbalances, and disrupted fat metabolism in fish exposed to environmentally realistic levels over 28 days. While this study was done in fish, not humans, it's a warning sign worth watching, tire particles are a widespread and growing pollutant in our water systems, and this research suggests they could harm the health of aquatic life we may eventually eat or interact with, making it worth understanding how these hidden pollutants move through the environment.
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