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Secretory phospholipases and membrane polishing
1Department of Perinatal Medicine, Royal Women's Hospital, Carlton, Victoria, Australia.
Placenta
|March 3, 1998
Summary
Secretory phospholipase A2 (PLA2) isozymes in human pregnancy tissues may regulate cell membrane phospholipids. This process, termed "membrane polishing," influences cell function and interactions.
Area of Science:
- Biochemistry
- Reproductive Biology
- Cell Biology
Background:
- Secretory phospholipase A2 (PLA2) isozymes are present in human gestational tissues.
- Their precise roles in pregnancy homeostasis and pathophysiology remain unclear.
Purpose of the Study:
- Review recent data on secretory PLA2 isozyme expression in human gestational tissues.
- Propose a role for these enzymes in regulating glycerophospholipid expression in cell membranes.
Main Methods:
- Literature review of existing research on secretory PLA2 isozymes.
- Analysis of data concerning their expression and potential functions in gestational tissues.
Main Results:
- Three secretory PLA2 isozymes and a cell-surface receptor identified in human term gestational tissues.
- These isozymes may regulate aminophospholipid expression on the cell surface.
- Potential involvement in glycerophospholipid metabolite formation (e.g., prostaglandins).
Conclusions:
- Secretory PLA2 isozymes may regulate cell membrane aminophospholipid exposure via 'membrane polishing'.
- This mechanism could modulate cell function, protein binding, membrane fusion, and cellular recognition during pregnancy.