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Eosinophils and major basic protein damage but do not detach human amniotic epithelial cells
B W Robinson1, T Venaille, R Blum
1Department of Medicine, University of Western Australia, Nedlands.
Experimental Lung Research
|September 1, 1992
Summary
Neutrophils, not eosinophils, are more effective at detaching airway epithelial cells in asthma. Both cell types, however, cause similar levels of epithelial cell damage, with major basic protein from eosinophils primarily causing damage.
Area of Science:
- Immunology
- Cell Biology
- Respiratory Medicine
Background:
- Epithelial cell damage and detachment are implicated in asthma pathogenesis.
- Eosinophils and neutrophils infiltrate asthmatic airways.
- Eosinophils have been suggested as a key mediator of epithelial cell detachment in asthma.
Purpose of the Study:
- To compare the capacity of human eosinophils and neutrophils to induce epithelial cell detachment.
- To investigate the role of eosinophils and neutrophils in airway epithelial damage.
- To assess the effect of major basic protein (MBP) on epithelial cells.
Main Methods:
- Utilized a human amniotic epithelial cell-basement membrane model.
- Compared detachment induced by activated eosinophils and neutrophils.
- Assessed epithelial cell damage using a 51Cr release assay.
- Investigated the effects of purified major basic protein (MBP).
Main Results:
- Neutrophils induced significantly more epithelial cell detachment (29%) than eosinophils (less than 10%) after 4 hours.
- Both eosinophils and neutrophils caused similar levels of epithelial cell damage (17-18% 51Cr release).
- Major basic protein (MBP) caused significant epithelial cell damage (77% 51Cr release) but minimal detachment (less than 5%).
Conclusions:
- Neutrophils are more potent in inducing human airway epithelial cell detachment compared to eosinophils.
- Both eosinophils and neutrophils contribute to epithelial cell damage in the context of asthma.
- Eosinophil-derived major basic protein (MBP) is a key mediator of epithelial cell damage but not detachment.