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Long-term low-dose nanoplastic exposure induces neurotoxicity with oxidative brain damage
Summary
Scientists exposed mice to tiny plastic particles (nanoplastics) at low doses over 17 months—mimicking the kind of gradual exposure humans might get from everyday plastic use—and found it caused brain inflammation, oxidative damage, and activated genetic pathways linked to diseases like Parkinson's. While the mice didn't show major behavior changes, this study suggests that even small, ongoing amounts of plastic exposure over time could quietly harm brain health, reinforcing why reducing plastic exposure in daily life may be worth considering. More research is needed to confirm whether these effects translate to humans
The potential health impacts of nanoplastic exposure have attracted significant scientific interest, with emerging evidence linking their presence to various human diseases. Alarmingly, polystyrene nanoplastics (PS-NPs) have been detected in brain tissues, showing their capability to penetrate the blood-brain barrier (BBB). However, most previous animal studies used high-dose acute exposures, which may not properly reflect the common long-term, low-dose exposure scenarios in real-world. Thus, we conducted a 17-month exposure study in mice using PS-NPs with significantly lower dosage and assessed their behavior and brain damage. Our results demonstrated that prolonged exposure induced oxidative stress in the brain with significantly elevated reactive oxygen species (ROS) and malondialdehyde (MDA) levels, as well as activated immune responses, including microglial activation (Iba1+) and increased release of inflammatory cytokines, indicating a chronic inflammatory state in the brain. In behavioral experiments, only the elevated plus maze (EPM) showed significant differences, however, pathways linked to neurodegenerative diseases like Parkinson disease were notably upregulated. This unfavorable molecular network restructuring may heighten the risk for such disorders. These findings provide critical evidence for the adverse neural effects of long-term, low-dose PS-NPs exposure, thus laying the ground for further more detailed investigation and offering insights for future health interventions and preventive strategies.