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Phospholipase D and immune receptor signalling.
Alirio J Melendez1, Janet M Allen
1Department of Physiology, Faculty of Medicine, National University of Singapore, 117597, Singapore.
Seminars in Immunology
|March 9, 2002
Summary
Phosphatidylcholine phospholipase D (PC-PLD) activation generates phosphatidic acid, a key signaling molecule. Understanding PC-PLD
Area of Science:
- Cellular signaling
- Biochemistry
- Immunology
Background:
- Immune receptor activation is linked to phosphatidylcholine phospholipase D (PC-PLD) activity.
- PC-PLD hydrolyzes phosphatidylcholine, producing phosphatidic acid and choline.
- Previous research faced challenges in isolating PC-PLD's specific cellular effects due to coupled signaling pathways.
Purpose of the Study:
- To elucidate the precise cell activation events mediated by PC-PLD.
- To define the role of phosphatidic acid as an intracellular signaling molecule.
- To investigate the downstream effects of PC-PLD activation.
Main Methods:
- Investigated the signaling cascades downstream of immune receptors.
- Analyzed the generation of phosphatidic acid and its metabolites.
- Studied the regulation of intracellular calcium stores, sphingosine kinase, and protein kinase C.
Main Results:
- Phosphatidic acid is a crucial intracellular messenger.
- PC-PLD activation influences calcium release, enzyme activation (sphingosine kinase, protein kinase C), and membrane dynamics.
- Phosphatidic acid is rapidly metabolized into other bioactive lipids like lysophosphatidic acid and diacylglycerol.
Conclusions:
- PC-PLD plays a significant role in immune receptor-mediated cell activation.
- Phosphatidic acid mediates diverse cellular responses, including calcium mobilization and enzyme activation.
- The metabolic fate of phosphatidic acid contributes to the complexity of cellular signaling.