Related Experiment Videos
Phospholipase A2 (PLA2) activity in undifferentiated U937 cells
W Galbraith1, K A Paschetto, T M Stevens
1Medical Products Department, E.I. du Pont de Nemours & Co. Inc., Wilmington, DE 19880-400.
Agents and Actions
|June 1, 1989
Summary
This study identified three distinct phospholipase A2 (PLA2) activities in undifferentiated U937 cells. These findings reveal multiple PLA2 enzymes are present in these cells.
Area of Science:
- Biochemistry
- Cell Biology
- Enzymology
Background:
- Phospholipase A2 (PLA2) activity has been previously observed in U937 cells.
- Characterization of PLA2 activity in undifferentiated U937 cells is essential for understanding cellular signaling pathways.
Purpose of the Study:
- To characterize the distinct phospholipase A2 (PLA2) activities present in undifferentiated U937 cells.
- To identify the specific fractions and substrates associated with different PLA2 activities.
Main Methods:
- U937 cells were cultured in suspension, harvested, and homogenized.
- Cellular fractions were obtained through acid extraction and sucrose density gradient centrifugation.
- PLA2 activity was measured using radiolabeled phosphatidylcholine and heat-inactivated E. coli substrates.
Main Results:
- Substrate-specific PLA2 activity was detected in both acid-extracted and 25% sucrose gradient fractions.
- Investigation with standard inhibitors provided further characterization of these PLA2 activities.
- Three distinct PLA2 activities were identified in undifferentiated U937 cells.
Conclusions:
- Undifferentiated U937 cells possess at least three distinct phospholipase A2 (PLA2) activities.
- This study provides the first evidence for multiple PLA2 activities in undifferentiated U937 cells.
- Further research can explore the specific roles and functions of these identified PLA2 enzymes.