Comparison of Different Sperm Isolation Strategies for Fresh and Cryopreserved Human Spermatozoa Using a Simple...

Area of Science:

• Andrology
• Reproductive Medicine
• Sperm Biology

Background:

• Sperm isolation techniques are crucial for assisted reproductive technologies.
• Assessing both sperm vitality and DNA integrity simultaneously is challenging.
• Cryopreservation negatively impacts sperm quality.

Purpose of the Study:

• To compare the efficacy of three sperm isolation methods: Felix System, swim-up, and density gradient centrifugation (DGC).
• To evaluate these methods, particularly after cryopreservation.
• To introduce a novel technique for parallel assessment of sperm vitality and DNA integrity.

Main Methods:

• Developed a novel assessment technique combining a live/dead stain with the Sperm Chromatin Dispersal (SCD) assay.
• Compared Felix System (net charge), swim-up (motility), and DGC (density) for sperm isolation.
• Tested isolation methods on cryopreserved spermatozoa.

Main Results:

• The Felix System produced superior sperm populations compared to DGC (p < 0.001).
• Felix System performance was equivalent to swim-up in optimizing live, DNA-intact sperm.
• All methods were challenged by cryopreservation's impact on sperm quality.

Conclusions:

• A novel parallel assessment method for sperm vitality and DNA damage was developed.
• This method facilitates effective comparison of sperm isolation techniques.
• The novel assessment technique has potential applications in diagnostic andrology.