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Cellular Uptake and Nuclear Accumulation of Polystyrene Nanoplastics in 3T3 Fibroblasts and Hepatocytes of Rattus norvegicus
Summary
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.
Polystyrene nanoplastics (PSNPs) are emerging contaminants that pose potential risks to cellular health due to their small size and ability to penetrate biological barriers. This study investigates the cellular uptake mechanisms and intracellular distribution of PSNPs using Rattus norvegicus hepatocytes and 3T3 fibroblast cell cultures. Fluorescence microscopy analysis demonstrated substantial PSNP accumulation within both cell types, with distinct intracellular localization patterns. In hepatocytes, PSNPs were predominantly observed in the cytoplasm and occasionally within the nucleus, suggesting active endocytosis and potential nuclear transport. In 3T3 fibroblasts, PSNPs were found not only in the cytoplasm and around the nucleus but also within the nuclear compartment, highlighting their ability to traverse the nuclear envelope. Quantitative analysis revealed significant morphological changes, increased cell and nucleus diam eters, and a higher percentage of necrotic cells in PSNP-exposed groups compared to controls (p < 0.05). The observed cellular stress responses may induce oxidative stress, membrane disruption, and apoptosis, supported by morphological and fluorescence evidence indicating interactions with proteins, lipids, and nuclear components.. These findings high light the potential health risks associated with PSNP exposure, highlighting the need for further research into their long-term biological impacts and the mechanisms underlying their cellular interactions.