Characterization of the lectin binding pattern in human spermatozoa after swim-up selection

Area of Science:

• Reproductive Biology
• Cell Biology
• Biochemistry

Background:

• Sperm capacitation involves hyperactivated motility, crucial for fertilization.
• Progressive sperm motility is key for semen processing, but membrane damage can occur in motile sperm.
• Understanding sperm surface changes during selection is vital for reproductive success.

Purpose of the Study:

• To investigate alterations in sperm plasma membrane carbohydrate residues after swim-up selection.
• To correlate lectin staining patterns with sperm motility and selection efficiency.

Main Methods:

• Analysis of lectin staining patterns on human sperm before and after swim-up selection.
• Utilized lectins Triticum vulgaris, Arachis hypogaea, Aleuria aurantia, and Canavalia ensiformis.
• Studied samples from normozoospermic donors.

Main Results:

• Swim-up selection induced changes in carbohydrate residue distribution for Triticum vulgaris and Arachis hypogaea lectins.
• Triticum vulgaris showed a shift from dotted to homogenous staining on the acrosomal region.
• Arachis hypogaea staining changed from the acrosomal region to include the equatorial segment in selected sperm.

Conclusions:

• Swim-up selection modifies sperm surface carbohydrate patterns.
• These modifications are potentially linked to the regulation of progressive motility.
• Changes in carbohydrate residues may play a role in preparing sperm for capacitation and fertilization.