Deoxyribonuclease activity in human seminal fluid

Area of Science:

• Biochemistry
• Reproductive Biology
• Enzymology

Background:

• Deoxyribonuclease (DNase) is an enzyme that degrades DNA.
• Seminal fluid contains various enzymes, but their origins and functions are not fully elucidated.
• Understanding DNase activity in seminal fluid may provide insights into male reproductive health.

Purpose of the Study:

• To investigate Deoxyribonuclease (DNase) activity in human seminal fluid.
• To determine the correlation between DNase activity and seminal fluid quality (sperm count).
• To identify the potential origin of DNase in seminal fluid.

Main Methods:

• DNase activity was measured using herring sperm deoxyribonucleic acid (DNA) as a substrate.
• Seminal fluid was fractionated, and sperm sonicates were analyzed.
• Activity was assessed across different pH values and after sample freezing/thawing.

Main Results:

• No significant correlation was found between DNase activity and seminal fluid quality in normospermic, oligozoospermic, and azoospermic samples.
• DNase activity was significantly higher in the first seminal fluid fraction (971 ng/ml) compared to the second (764 ng/ml).
• Sonicates of washed sperm showed no DNase activity.

Conclusions:

• DNase activity in human seminal fluid is not indicative of sperm quality.
• The epididymis and potentially the vas deferens are suggested as the primary sources of seminal DNase.
• This enzyme likely plays a role in the degradation of DNA from dead cells within the reproductive tract.