Microplastic concentrations in brain tissue are higher than in other organs.
The presence of microplastics and nanoplastics (MNPs) in the environment has raised growing concern over the past few decades. A recent study in Nature Medicine reveals the extent of MNP accumulation in human tissues, especially in the brain, liver, and kidneys. These findings emphasize the need for research and innovation in the plastics industry to address these challenges.
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Researchers used advanced techniques to detect and analyze MNPs in human tissues, including pyrolysis gas chromatography–mass spectrometry (Py-GC/MS), Fourier transform infrared spectroscopy, and electron microscopy.
Py-GC/MS analysis showed that MNP concentrations in brain samples increased from a median of 3,345 µg/g in 2016 to 4,917 µg/g in 2024. Polyethylene was the most common polymer, making up about 75% of the detected microplastics. Electron microscopy revealed that MNPs in brain tissue primarily exist as nanoscale shard-like fragments. ATR-FTIR spectroscopy identified polyethylene, polypropylene, and polyvinyl chloride as the main polymers present.
Researchers observed microplastics in immune cells and blood vessel walls, suggesting potential biological interactions. These findings highlight the need for further research to understand how microplastics accumulate in brain tissue and their potential effects on neurological health.
Brain images using different techniques like Polarization wave microscopy, SEM and TEM. Courtesy of Bioaccumulation of microplastics in decedent human brains.
The study shows that MNP concentrations in brain tissue have risen over time. Liver and kidney samples from 2024 contained median total plastic concentrations of 433 µg/g and 404 µg/g, while brain samples had a concentration of 4,917 µg/g. Polyethylene, polypropylene, and polyvinyl chloride in the brain suggest a unique retention mechanism compared to other organs.
Notably, age, sex, and cause of death did not affect microplastic concentrations. This suggests widespread exposure across demographics. Moreover, the distribution of MNPs in brain tissue differed from that in the liver and kidneys, indicating unique mechanisms of uptake and retention.
Microplastic concentrations in liver, kidney and brain decedent human samples. Courtesy of Bioaccumulation of microplastics in decedent human brains.
Microplastics come from everyday products, leading to widespread exposure. Common sources include synthetic textiles that shed microfibers during washing, and personal care products like exfoliating scrubs and toothpaste with microbeads. Plastic packaging, disposable utensils, and tire wear particles also add significantly to pollution.
Brain samples from individuals with dementia showed higher microplastic levels, reaching up to 26,076 µg/g, compared to 4,917 µg/g in those without dementia. The elevated concentrations were most noticeable along cerebrovascular walls and within immune cells, suggesting a link between MNP retention and neurodegenerative processes. This raises concerns about whether prolonged exposure to MNPs could worsen neurological conditions by impacting cerebrovascular integrity and immune responses.
The engineering community is working on innovative solutions to reduce plastic-related risks. Research into biodegradable polymers and sustainable materials aims to reduce the use of traditional plastics. At the same time, improvements in filtration and purification systems target microplastic contamination in water and air. For example, recent studies show that ultrafiltration membranes can remove up to 99% of microplastics from drinking water, offering a promising strategy to reduce exposure.
The discovery of microplastics in the human brain highlights the urgency of understanding their effects on human health. Future studies should explore whether MNP accumulation contributes to cognitive decline. Research should also focus on evaluating the effectiveness of preventive measures, such as reducing plastic pollution. It must analyze the impact of advancing filtration technologies in minimizing human exposure and the accumulation of microplastics in biological tissues.
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