Silane-coated silica particle colloid processing of human sperm

Area of Science:

• Reproductive Biology
• Sperm Processing Technologies

Background:

• Sperm processing is critical for assisted reproductive technologies (ART).
• Silane-coated silica particle colloids offer an alternative to traditional Percoll gradients for sperm separation.
• Variability in colloid lots may impact sperm quality outcomes.

Purpose of the Study:

• To compare sperm quality after processing with different lots of silane-coated silica particle colloid solutions versus Percoll and a control.
• To evaluate kinematic parameters, acrosome status, membrane integrity, DNA normality, and heat-inducible hyperactivation.

Main Methods:

• Pooled cryopreserved-thawed sperm from 10 donors were processed.
• Methods included centrifuge wash, two-layer Percoll, and three lots of silane-coated silica particle colloids.
• Sperm parameters were assessed using motility analyzers and specific staining techniques.

Main Results:

• Colloidal solutions yielded higher sperm recovery than Percoll.
• Total sperm motility was higher with colloids than the control, with no difference between Percoll and colloids.
• Progressive motility and hyperactivation varied significantly among colloid lots.
• Percoll maintained higher tail membrane integrity, while some colloids affected head membrane integrity.
• Apoptosis rates varied among colloid lots, and one colloid significantly increased heat-induced hyperactivation.

Conclusions:

• Significant lot-to-lot variability exists in silane-coated silica particle colloid solutions for sperm processing.
• Each colloid lot demonstrated unique strengths in improving specific sperm parameters.
• While effective for motile sperm recovery, colloid lot selection impacts sperm motility types and overall quality.
• Lot variability necessitates careful interpretation of studies using single colloid sources.
• Optimizing colloid lot selection can enhance sperm parameters for ART success.