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Regulating inflammation through the anti-inflammatory enzyme platelet-activating factor-acetylhydrolase
Hugo C Castro Faria Neto1, Diana M Stafforini, Stephen M Prescott
1Laboratório de Imunofarmacologia, Departamento de Fisiologia e Farmacodinâmica, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brasil.
Memorias Do Instituto Oswaldo Cruz
|June 18, 2005
Summary
Platelet-activating factor (PAF) is a potent inflammatory mediator. Its deactivation by PAF-acetylhydrolase (PAF-AH) regulates inflammatory responses and may offer therapeutic potential for inflammatory diseases.
Area of Science:
- Biochemistry
- Immunology
- Lipid Metabolism
Background:
- Platelet-activating factor (PAF) is a potent lipid mediator crucial in inflammatory processes.
- The acetyl group at the sn-2 position of PAF's glycerol backbone is vital for its biological activity.
- Deacetylation of PAF yields inactive lyso-PAF, a reaction catalyzed by PAF-acetylhydrolase (PAF-AH).
Purpose of the Study:
- To review the role of PAF-acetylhydrolase (PAF-AH) in inflammatory diseases.
- To explore the potential of PAF-AH as a therapeutic target for modulating inflammation.
Main Methods:
- Biochemical and enzymological evaluations were used to characterize PAF-AH.
- The review synthesizes existing observations on PAF-AH's function in regulating inflammatory signals.
Main Results:
- PAF-AH is a calcium-independent phospholipase A2 that degrades PAF and PAF-like oxidized phospholipids.
- At least three types of PAF-AH exist in mammals: intracellular types I and II, and a plasma type.
- Plasma PAF-AH plays a key role in terminating inflammatory signals, thereby regulating inflammatory responses.
Conclusions:
- PAF-AH is a critical regulator of inflammatory responses by inactivating PAF and related lipids.
- Targeting PAF-AH presents a promising strategy for managing diseases characterized by dysregulated inflammation.