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Effects of Combined Arsenic and Polystyrene Microplastics on Epididymal Sperm Quality in Wistar Rats
Summary
In a study on rats, exposure to arsenic and microplastics separately harmed sperm quality (count, movement, and shape), but combining both pollutants caused even more damage than either one alone. This matters because it suggests real-world exposure to multiple pollutants at once, which is how humans actually encounter them, could pose a bigger threat to male fertility than we'd predict by studying toxins one at a time. The researchers also found that a natural plant compound called imperatorin partially protected sperm health, offering a possible starting point for future treatments, though it didn't fully reverse the damage.
Background: Arsenic contamination and increasing environmental exposure to microplastics have emerged as important public health concerns due to their potential adverse effects on reproductive health. While both toxicants have been independently associated with male reproductive dysfunction, evidence concerning their combined impact on sperm quality remains inadequate. Objective: To investigate the effects of arsenic and polystyrene microplastics, alone and in combination, on epididymal sperm characteristics in adult Wistar rats and to evaluate the potential protective effect of imperatorin. Methodology: Thirty adult male Wistar rats were randomly assigned to five groups (n = 6): G1 (control), G2-(arsenic), G3 (Microplastics), G4 (arsenic + Microplastics) and G5 (arsenic + Microplastics + imperatorin Epididymal sperm concentration, motility and morphology were measured after 28 days of exposure. Statistics were evaluated using the Kruskal-Wallis test, with p<0.05 considered significant. Results: Individual exposure to arsenic or polystyrene microplastics adversely affected epididymal sperm parameters compared with the control group. The combined exposure caused the most harm, as sperm concentration, motility and morphologically normal sperm decreased. Administration of imperatorin attenuated these detrimental effects, leading to a partial improvement in sperm quality when compared with the combined exposure group; however, the measured parameters remained below those observed in the control animals. Conclusion: Co-exposure to arsenic and polystyrene microplastics produced more severe adverse effects on epididymal sperm quality than individual exposures, indicating increased reproductive toxicity. Imperatorin partially protected against these alterations, indicating its potential as a treatment for environmental pollutant-induced male reproductive dysfunction.