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Effect of platelet activating factor on leukocyte-endothelial cell interactions
J G Garcia1, A Azghani, K S Callahan
1Department of Biochemistry, University of Texas Health Center, Tyler.
Thrombosis Research
|July 1, 1988
Summary
Platelet activating factor (PAF) increases neutrophil adhesion to endothelium and enhances macromolecule permeability, contributing to tissue inflammation. These effects highlight PAF's significant role in endothelial responses to injury.
Area of Science:
- Immunology
- Cell Biology
- Vascular Biology
Background:
- Platelet activating factor (PAF) is a potent inflammatory mediator.
- Its role in endothelial cell responses and tissue inflammation requires further elucidation.
Purpose of the Study:
- To investigate the in vitro proinflammatory effects of PAF on human neutrophils and endothelial cells.
- To determine PAF's impact on neutrophil-endothelial cell adhesion and endothelial barrier function.
Main Methods:
- In vitro study using human neutrophils and endothelial cell monolayers.
- Assessed neutrophil adherence to endothelium and macromolecule permeability (125I-albumin clearance).
- Utilized PAF receptor antagonist kadsurenone to investigate receptor involvement.
Main Results:
- PAF induced a time- and dose-dependent increase in neutrophil-endothelial cell adhesion.
- Adhesion was primarily mediated by effects on endothelium, independent of cyclooxygenase products.
- PAF-induced leukocyte activation significantly increased endothelial permeability to macromolecules.
Conclusions:
- PAF exhibits potent proinflammatory effects on endothelial cells.
- Endothelial PAF receptors play a crucial role in PAF-mediated neutrophil adhesion.
- PAF contributes significantly to endothelial barrier dysfunction during inflammatory responses.