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The association between inhaled tire-wear particle exposure and cognitive dysfunction in rats
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Tiny particles released from car tires as they wear down—which end up in the air we breathe near roads—caused memory and learning problems in rats, along with brain inflammation and disrupted gut bacteria. While this study was done in animals, not humans, it raises real concerns about how everyday air pollution from traffic might affect brain health over time, especially for people who live or work near busy roads.
Tire wear particles (TWPs), an emerging environmental contaminant, have poorly understood impacts on cognitive function and underlying mechanisms. Herein, environmental samples from main traffic arteries were analyzed to determine TWPs concentrations, based on which Sprague-Dawley rats were allocated into control, low-TWPs, and high-TWPs exposure groups. An exposure model of TWPs was established in Sprague-Dawley rats by continuous nose and mouth inhalation of TWPs for 14 and 28 days. The experimental results demonstrated that TWPs induced multiple adverse effects in rats, primarily manifested as impaired learning and memory behavior, dysbiosis of the gut microbiota, and pathological damage accompanied by impairments in the lung, brain and hippocampal tissues. Malondialdehyde (MDA) levels were significantly elevated in both the Low and High concentration exposure groups. Gut microbiota shifts included reduced beneficial bacteria (e.g., norank_f_Ruminococcaceae, Eubacterium, Bacillus) and increased harmful bacteria (e.g., Turicibacter). Metabolomics analysis revealed altered metabolite levels and pathways linked to neurodegeneration and oxidative stress. Collectively, inhaled TWPs may alter gut microbiota and metabolome, potentially contributing to cognitive deficits.
More Papers Like This
Where the rubber hits the road: The health effects of traffic-related micro- and nanoplastics via inhalation
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Tiny plastic and rubber particles from tire wear, breathed in near busy roads, were linked to short-term immune cell changes in volunteers and, in a nationwide study, to higher long-term risk of death from respiratory and neurological disease. This suggests traffic pollution from tires, not just exhaust, deserves more attention in air quality policy.
Where the rubber hits the road
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Tiny plastic and rubber particles worn off car tires and brakes are a real (if small) part of the air pollution near roads, and this research found that spending just a few hours near heavy traffic was linked to short-term changes in people's immune cells, though not immediate breathing problems. A separate analysis of nearly 10 million people in the Netherlands found that those living with higher long-term exposure to this tire and brake dust had a higher risk of dying from respiratory and neurological diseases, suggesting these overlooked pollution sources deserve more attention in air quality regulations alongside car exhaust.
Tire-Derived Microplastics as Chemically Complex Environmental Contaminants: Mechanistic Pathways, Exposure Gradients, and Implications for Environmental Health.
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Every time tires wear down on the road, they release tiny plastic and chemical particles into the air, water, and soil, and this review pulls together existing research showing these particles carry a toxic mix of chemicals linked to inflammation, blood vessel damage, and stress on the body's systems. People living near busy roads may face the highest exposure, raising concerns about long-term risks for heart and metabolic disease, though scientists say more direct research is needed to confirm exactly how much harm this causes in humans.
Tread lightly: immuno-toxicological health effects of traffic-related polymers in healthy adults.
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Researchers studied health effects in commuters exposed to traffic-related micro- and nanoplastics, primarily from tire wear, comparing outcomes between high-exposure and low-exposure groups. The study found evidence of immunotoxicological effects linked to airborne polymer particle exposure from road traffic.
Tread lightly: immuno-toxicological health effects of traffic-related polymers in healthy adults.
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Researchers studied the immunotoxicological effects of traffic-related micro- and nanoplastics in commuters exposed to tire wear particle emissions. Elevated exposure to airborne tire wear polymers was associated with measurable changes in immune cell profiles.
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