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Biochemical, Histological and Molecular Docking into the Impact of Polystyrene Nanoplastics on Antioxidant Enzymes and Testicular Health in Rats
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Tiny plastic particles called nanoplastics, found widely in our environment, may harm male fertility, according to a new rat study. Rats exposed to higher doses of these plastics showed weakened antioxidant defenses and physical damage to testicular tissue, including fewer developing sperm cells. While this research was done in rats, not humans, it adds to growing concerns that the microplastics and nanoplastics we're routinely exposed to through food, water, and air could pose risks to reproductive health.
Polystyrene nanoplastics (NPs) are widespread environmental pollutants that may pose health hazards. This study examined the impact of NPs exposure on antioxidant enzyme activity and testicular structure in rats. A total of 24 Rattus norvegicus (n=6) were allocated into four groups and administered varying NPs concentrations (0, 1, 2, and 4 µL/kg) via oral gavage for 35 days. After the exposure period, the rats were sacrificed to assess superoxide dismutase (SOD) and catalase (CAT) levels, as well as testicular histology. The findings indicated that NPs exposure did not significantly alter SOD levels but led to a significant decline in CAT levels at the highest concentration (4 µL/kg, p<0.05). Histological assessment showed reduced seminiferous tubule diameter and epithelial thickness, along with a significant reduction in spermatocyte and spermatid counts, indicating disruption in later stages of spermatogenesis. Complementary molecular docking analysis revealed that the polystyrene monomer had a stronger binding affinity for the catalase enzyme than for superoxide dismutase, supporting the observed reduction in CAT activity. These results highlight the potential adverse effects of NPs on reproductive health and raise concerns about human exposure risks.
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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.
Occurrence, toxicity and removal of polystyrene microplastics and nanoplastics in human sperm
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Researchers detected polystyrene microplastics in human semen and showed they reduce sperm function, then demonstrated that magnetic iron oxide nanoparticles can remove nanoplastics from semen samples — offering an early glimpse into both the reproductive health threat posed by microplastics and potential mitigation strategies.
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.
Polystyrene nanoparticles and nano-silver: their co-influence on male fertility in mice
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Researchers exposed mice to polystyrene nanoplastics and nano-silver separately and together for 30 days, finding that both substances reduced sperm count and motility while increasing abnormal sperm and oxidative stress markers. The combination was more damaging than either alone, raising concerns about everyday exposures to mixed nanomaterials from food packaging affecting male reproductive 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.
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