Polystyrene Microplastics Found to Cause Reproductive Damage in Human Spermatozoa

Strategic Insights -

A recent study published in the journal Toxics has uncovered disturbing evidence of the detrimental effects of polystyrene microplastics (PS-MPs) on human spermatozoa. The research, conducted by a team of scientists from the University of Campania Luigi Vanvitelli in Italy, found that exposure to PS-MPs led to significant reductions in sperm vitality, motility, and genomic stability, as well as increased sperm DNA fragmentation and reactive oxygen species production. Furthermore, the study revealed that PS-MP exposure may impair sperm-oocyte fusion, highlighting potential mechanisms of sperm dysfunction.

Key Takeaways:

  • The study tested the cytotoxicity and genotoxicity of PS-MPs on human semen samples exposed to concentrations of 105 and 210 mg/mL for 30-60-90 minutes.
  • Exposure to PS-MPs led to a time-dependent decrease in sperm vitality and motility, as well as a concentration-dependent reduction in genomic stability.
  • Sperm DNA fragmentation and reactive oxygen species production were increased in the groups exposed to PS-MPs.
  • The expression of spermatozoa-specific genes essential for sperm-oocyte fusion was downregulated after PS-MP exposure.
  • The study suggests that PS-MP exposure may have implications for sperm functionality and fertility.
  • The researchers recommend that possible environmental and working exposure to pollutants be considered during counseling for male infertility.

Statistics:

  • The study exposed human semen samples to PS-MPs concentrations of 105 and 210 mg/mL for 30-60-90 minutes.
  • Sperm vitality and motility decreased in a time-dependent manner after PS-MP exposure.
  • Genomic stability was reduced by 20-30% after PS-MP exposure at both concentrations.
  • Sperm DNA fragmentation increased by 40-50% after PS-MP exposure at both concentrations.
  • Reactive oxygen species production increased by 25-35% after PS-MP exposure at both concentrations.

Sources:

  • "Impact of Polystyrene Microplastics on Human Sperm Functionality: An In Vitro Study of Cytotoxicity, Genotoxicity, and Fertility-Related Genes Expression." Toxics 13, no. 7 (2025): 605.
  • University of Campania Luigi Vanvitelli, "Re-PORTO Project: The Impact of Synthetic Microplastics on Human Health," grant award from the Italian Ministry of University and Research.