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P20-25 Chronic exposure to polystyrene nanoplastics induces inhibition of proliferation and modulation of heat shock protein expression
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Cellular Uptake and Nuclear Accumulation of Polystyrene Nanoplastics in 3T3 Fibroblasts and Hepatocytes of Rattus norvegicus
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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.
Stress (Cortisol) and Hepatotoxic Effects of Polystyrene Micro- and Nanoplastics in Swiss Albino Mice: A Comparative Study
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Researchers exposed Swiss albino mice to polystyrene micro- and nanoplastics and compared the stress and liver toxicity responses, finding that both sizes elevated cortisol levels and caused hepatotoxic damage, with nanoplastics generally producing more pronounced physiological disruption than microplastics.
Prenatal exposure to polystyrene nanoplastics caused testicular development toxicities and relative mechanisms in male offspring mice from embryo to adulthood
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Scientists exposed pregnant mice to nanoplastics (tiny plastic particles found in our environment, blood, and even placentas) and found their male offspring had slowed growth before birth, hit puberty earlier, and had reduced fertility as adults. The nanoplastics appeared to disrupt key genes and cells needed for normal testicle development and hormone production. While this is animal research, it adds to growing evidence that plastic exposure during pregnancy could affect a baby's reproductive development later in life.
Polystyrene Microplastics Disrupt Anticancer Proteins: An In Silico and In Vitro Study
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Molecular docking and cell culture experiments showed that polystyrene microplastics act as competitive inhibitors of melatonin receptors MT1 and MT2 — proteins central to anticancer signaling — and bind strongly to complement immune regulators Factor H and Factor I, while also inducing cytotoxicity and apoptosis in colon and breast cancer cell lines. These findings suggest microplastic exposure may interfere with the body's own cancer-suppression and immune regulatory mechanisms at the molecular level.
Cytotoxicity of Polystyrene Nanoplastics Involves Mitochondrial Dysfunction and DNA Damage in Hemocytes of the Pacific Oyster
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Scientists found that tiny plastic particles (nanoplastics) can damage the immune cells of oysters by harming their mitochondria, the "batteries" that power cells, leading to DNA damage even at low exposure levels. While this study was done in oysters, not humans, it adds to growing evidence that nanoplastics can disrupt basic cell functions, raising questions about what similar exposure might mean for human health given how widespread plastic pollution has become in our food and water.
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