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Fatty acid pattern of human prostasome lipid
G Arienti1, E Carlini, A Polci
1Istituto di Biochimica e Chimica Medica, Università degli Studi di Perugia, Via del Giochetto, Perugia, 06127, USA. arienti@unipg.it
Archives of Biochemistry and Biophysics
|October 24, 1998
Summary
Prostasomes, found in semen, fuse with sperm to stabilize the sperm membrane. This interaction enriches sperm with cholesterol and sphingolipids, preventing premature acrosome reactions.
Area of Science:
- Reproductive biology
- Cell biology
- Biochemistry
Background:
- Prostasomes are prostatic organelles in human semen.
- They possess a unique lipid composition rich in cholesterol and sphingomyelin.
- Prostasomes contain proteins involved in catalytic activity and immune response.
Purpose of the Study:
- To analyze the fatty acid pattern of prostasome lipids.
- To compare prostasome lipids with sperm membrane lipids.
- To understand the implications of prostasome-sperm fusion on sperm membrane stability.
Main Methods:
- Analysis of lipid and fatty acid composition of prostasomes and sperm.
- Comparison of lipid profiles between prostasomes and sperm membranes.
Main Results:
- Prostasome lipid composition differs significantly from sperm membrane lipid composition.
- Polyunsaturated phosphatidylcholines are rare in prostasomes but common in sperm membranes.
- Prostasomes are rich in cholesterol, sphingomyelin, and saturated glycerophospholipids.
Conclusions:
- Prostasome fusion with sperm stabilizes the sperm plasma membrane.
- This stabilization is achieved by enriching the sperm membrane with specific lipids.
- This process likely prevents premature acrosome reactions, crucial for male fertility.