Promotive effect on human sperm progressive motility by prostasomes

Area of Science:

• Reproductive Biology
• Biochemistry

Background:

• Seminal plasma contains various components crucial for sperm function.
• Prostasomes are membrane-surrounded organelles found in seminal plasma.
• The specific role of prostasomes in sperm motility requires further elucidation.

Purpose of the Study:

• To investigate the relationship between seminal plasma constituents, ATPase activity, and sperm progressive motility.
• To identify the specific fraction of seminal plasma responsible for promoting sperm motility.
• To characterize the role of prostasomes in sperm progressive motility.

Main Methods:

• Separation of seminal plasma constituents using Sepharose G200 gel chromatography.
• Analysis of eluted fractions for protein content, ATPase activity, and sperm motility-promoting activity.
• Electron microscopy of specific chromatographic fractions.

Main Results:

• A distinct chromatographic peak exhibited maximum ATPase activity and maximum promotive effect on sperm progressive motility.
• This peak was identified as containing prostasomes and eluted first, with lower protein content than later fractions.
• Other fractions lacked ATPase activity and prostasomes, showing irregular effects on sperm motility.
• Disruption of prostasome membrane integrity diminished their positive effect on sperm motility.

Conclusions:

• Prostasomes are the primary component in seminal plasma responsible for enhancing sperm progressive motility.
• The ATPase activity of prostasomes is directly linked to their function in promoting sperm motility.
• The mechanism may involve the maintenance of calcium ion gradients across the prostasome membrane.