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Human seminal vesicle-specific antigen during semen liquefaction
1Department of Anatomy and Cell Biology, University of Virginia Medical Center, Charlottesville 22908.
Biology of Reproduction
|September 1, 1987
Summary
Seminal vesicle-specific antigen (SVSA) undergoes rapid mass transformation during semen liquefaction. High molecular weight SVSA forms are quickly degraded into smaller peptides within minutes of ejaculation.
Area of Science:
- Reproductive Biology
- Biochemistry
- Proteomics
Background:
- Seminal vesicle-specific antigen (SVSA) is a key component of human seminal plasma.
- Understanding SVSA's fate during semen liquefaction is crucial for reproductive studies.
Purpose of the Study:
- To investigate the molecular transformations of SVSA during the process of semen liquefaction.
- To characterize the changes in SVSA mass and immunoreactivity over time post-ejaculation.
Main Methods:
- Utilized monoclonal antibody MHS-5 for western blot analysis of human seminal plasma.
- Collected ejaculates from vasectomized donors under conditions to control liquefaction.
- Analyzed samples at various time points during liquefaction, inhibiting further changes with SDS.
Main Results:
- Initially, SVSA was detected on multiple bands (15-92 kDa) in unliquefied semen.
- Within 5 minutes of ejaculation, smaller immunoreactive peptides (<15 kDa) appeared.
- Major SVSA bands (69-71 kDa and 58 kDa) disappeared rapidly, while smaller forms increased.
- By 24-48 hours, a predominant 10.9 kDa band was observed.
Conclusions:
- SVSA undergoes rapid proteolytic processing during semen liquefaction.
- The transformation involves the conversion of high molecular weight forms to lower molecular weight peptides.
- These findings provide insights into the dynamic biochemical changes occurring in semen.