[Do preparation techniques induce ultrastructural sperm damage? An electron microscopic study]

Area of Science:

• Reproductive Biology
• Andrology
• Cell Biology

Background:

• Sperm preparation techniques are crucial for assisted reproductive technologies.
• Assessing ultrastructural integrity is vital for evaluating sperm quality.
• Different methods may impact sperm morphology and function.

Purpose of the Study:

• To compare the ultrastructural damage to human spermatozoa induced by glass wool filtration and Percoll density gradient centrifugation.
• To evaluate the efficacy of these techniques in preserving acrosome integrity.
• To determine the optimal sperm preparation method based on structural integrity and recovery rate.

Main Methods:

• Human ejaculates from 20 normozoospermic men were processed using three methods: glass wool filtration, Percoll density gradient centrifugation, and a two-step centrifugation control.
• Scanning electron microscopy was employed to assess ultrastructural damage, focusing on acrosome integrity and sperm tail morphology.

Main Results:

• Glass wool filtration resulted in a significantly higher proportion of intact acrosomes compared to Percoll centrifugation (p < 0.05).
• Both glass wool filtration and Percoll centrifugation showed significantly better results in preserving acrosome integrity than the control method (p < 0.001 and p < 0.01, respectively).
• The clinical significance of sperm tail bending observed after Percoll centrifugation requires further investigation.

Conclusions:

• Both glass wool filtration and Percoll density gradient centrifugation are effective in preparing spermatozoa with intact acrosomes.
• Glass wool filtration is suggested as the more appropriate method due to its higher sperm recovery rate.
• Further research is needed to understand the implications of sperm tail bending post-Percoll centrifugation.