Semen processing by density gradient centrifugation is useful in selecting sperm with higher double-strand DNA...

Area of Science:

• Reproductive Biology
• Andrology
• Spermatozoa Analysis

Background:

• Sperm DNA integrity is crucial for successful fertilization and embryonic development.
• Assessing DNA damage in spermatozoa is important for male infertility evaluations.
• Density gradient centrifugation is a common technique for sperm preparation.

Purpose of the Study:

• To evaluate the impact of density gradient centrifugation on sperm DNA integrity.
• To correlate DNA fragmentation with standard semen parameters.
• To determine if specific layers from density gradient centrifugation yield sperm with better DNA quality.

Main Methods:

• Semen samples from 40 non-azoospermic men were analyzed.
• Samples were processed using PureSperm density gradient centrifugation.
• Sperm DNA fragmentation was assessed using the terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay.

Main Results:

• Density gradient centrifugation significantly reduced the proportion of spermatozoa with DNA fragmentation compared to the whole semen sample.
• Spermatozoa isolated from the 90% gradient layer showed significantly less DNA damage than those in the 70% and 50% layers.
• A significant correlation was found between sperm DNA fragmentation and strict sperm morphology, but not with patient age, concentration, or motility.

Conclusions:

• PureSperm density gradient centrifugation is effective in enhancing sperm DNA integrity.
• The 90% layer of the density gradient yields spermatozoa with superior DNA quality.
• This method aids in selecting sperm with higher double-strand DNA integrity, potentially improving outcomes in assisted reproductive technologies.