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Polystyrene Nanoplastic–Encapsulated Extracellular Vesicles Promote Blood–Brain Barrier Breakdown and Accumulate in the Brain
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Polystyrene nanoplastic-encapsulated extracellular vesicles promote blood-brain barrier breakdown and accumulate in the brain.
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Researchers found that extracellular vesicles encapsulating polystyrene nanoplastics prolonged intracellular retention in human endothelial cells, caused a 2.8-fold greater decline in blood-brain barrier electrical resistance than free nanoplastics alone, and promoted brain accumulation in vivo — implicating vesicle-mediated transport as a significant route for nanoplastic neurological entry.
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Researchers reviewed how micro- and nanoplastics ubiquitous in air, water, and soil can enter cells and disrupt neurological function, with evidence linking MNP exposure to oxidative stress, cellular damage, and impairment of neural signaling pathways.
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Scientists found that tiny plastic particles called nanoplastics can get inside liver and connective tissue cells from rats, and even sneak into the cell's nucleus, where DNA is stored. Cells exposed to these plastics showed signs of stress and damage, including swelling and higher rates of cell death, suggesting these ultra-small plastic particles may be more harmful than previously thought. While this study used animal cells rather than human cells, it raises important questions about what everyday exposure to nanoplastics (found in food packaging, water, and other sources) might mean for our own cellular health.
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Researchers tracked potential pathways by which micro- and nanoplastics may enter the human brain, examining both in vitro cell models and post-mortem brain tissue. They found that human monocytes rapidly internalized polystyrene particles into endocytic vesicles and mitochondria, and detected plastic particles in brain tissue samples, providing evidence that nanoplastics may be capable of crossing brain barriers.
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