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Platelet-activating factor and shock.
1Uniformed Services University of the Health Science, Department of Neurology, Bethesda, Md.
Progress in Biochemical Pharmacology
|January 1, 1988
Summary
Platelet-activating factor (PAF) is a potent lipid mediator that can cause shock, organ damage, and death. Understanding PAF
Area of Science:
- Biochemistry and Pharmacology
- Pathophysiology of Shock States
Background:
- Platelet-activating factor (PAF) is a potent vasoactive lipid implicated in various pathophysiological processes.
- PAF actions can lead to inadequate organ perfusion, irreversible damage, and death, particularly affecting the heart, pulmonary vessels, and microcirculation.
Purpose of the Study:
- To highlight the major components of PAF actions leading to shock.
- To discuss the role of PAF in shock states and potential therapeutic strategies.
- To review evidence for PAF's involvement in conditions like anaphylaxis and endotoxemia.
Main Methods:
- Review of existing literature on PAF actions and its role in shock.
- Analysis of data from studies involving PAF antagonists and other therapeutic interventions.
- Examination of evidence for PAF production in various pathophysiological processes.
Main Results:
- PAF induces hypotension, potentially exacerbating organ dysfunction through effects on pulmonary airways and promoting thrombi formation.
- PAF-induced shock and death can be prevented by both PAF antagonists and non-PAF antagonist drugs, such as dexamethasone.
- Limited direct proof exists for PAF production in shock states beyond anaphylaxis and endotoxemia.
Conclusions:
- PAF is a significant mediator capable of causing severe biological derangements and death.
- While its role in anaphylaxis and endotoxemia is supported, further investigation is needed for other shock conditions.
- Pharmacological interventions activating physiological mechanisms may reverse PAF-induced pathological processes.