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Human eotaxin induces eosinophil-derived neurotoxin release from normal human eosinophils
A El-Shazly1, K Masuyama, K Nakano
1Department of Otorhinolaryngology, School of Medicine, Kumamoto University, Kumamoto City, Japan.
International Archives of Allergy and Immunology
|October 6, 1998
Summary
Human eotaxin triggers eosinophil degranulation, releasing eosinophil-derived neurotoxin (EDN). This suggests eotaxin acts as a secretagogue, influencing allergic inflammation alongside its known chemotactic role.
Area of Science:
- Immunology
- Cell Biology
Background:
- Eosinophil granule proteins contribute to allergic inflammation.
- Human eotaxin's role in eosinophil degranulation was investigated.
Purpose of the Study:
- To determine the effect of human eotaxin on eosinophil exocytosis, specifically the release of eosinophil-derived neurotoxin (EDN).
Main Methods:
- Purified human eosinophils were stimulated with varying concentrations of eotaxin.
- EDN release was quantified using radioimmunoassay.
- Surface expression of adhesion molecules was analyzed via flow cytometry.
Main Results:
- Eotaxin induced EDN release in a dose-dependent manner, comparable in potency to RANTES and platelet-activating factor.
- Cytochalasin B inhibited eotaxin-induced EDN release.
- Eotaxin did not alter the surface expression of key adhesion molecules (CD11a, CD11b, CD18, VLA-4).
Conclusions:
- Eotaxin functions as a secretagogue, promoting eosinophil degranulation.
- Eotaxin-induced degranulation involves cytoskeletal changes, independent of adhesion molecule expression.