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Phospholipase A2 activity in prostasomes from human seminal plasma
M Lindahl1, C Tagesson, G Ronquist
1Department of Occupational Medicine, Linköping University Hospital, Sweden.
Urologia Internationalis
|January 1, 1987
Summary
Phospholipase A2 (PLA2) activity is abundant in human seminal plasma and highly concentrated in prostasomes. This enzyme requires calcium for function, and its role in prostasomes is explored.
Area of Science:
- Biochemistry
- Urology
- Reproductive Biology
Background:
- Prostasomes are unique vesicles found in human seminal plasma.
- Phospholipase A2 (PLA2) is an enzyme involved in various biological processes.
Purpose of the Study:
- To measure and characterize Phospholipase A2 (PLA2) activity within human seminal prostasomes.
- To investigate the biochemical properties and potential role of PLA2 in prostasomes.
Main Methods:
- Isolation and purification of prostasomes from human seminal plasma.
- Enzymatic assays to determine PLA2 activity at different pH levels.
- Effect of calcium and EDTA on PLA2 activity.
- Two-dimensional gel electrophoresis for protein analysis of prostasomes.
Main Results:
- High PLA2 activity was detected in seminal plasma, with a threefold enrichment in isolated prostasomes.
- Optimal PLA2 activity occurred at pH 8.0 and 10.5.
- Calcium was essential for PLA2 activity; EDTA significantly inhibited it.
- Prostasome protein analysis revealed a complex pattern within the 10-90 kDa range.
Conclusions:
- Prostasomes are a significant source of PLA2 activity in seminal plasma.
- The characterization of PLA2 in prostasomes provides insights into seminal fluid biochemistry.
- Further research is needed to elucidate the specific physiological role of PLA2 within prostasomes.