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Intercellular adhesion molecule-1 expression on the alveolar epithelium and its modification by hyperoxia
B H Kang1, J D Crapo, C D Wegner
1Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710.
American Journal of Respiratory Cell and Molecular Biology
|October 1, 1993
Summary
Intercellular adhesion molecule-1 (ICAM-1) is mainly on type I lung cells. Hyperoxia (100% O2) alters ICAM-1 distribution on type I cells and increases it on type II cells, potentially affecting neutrophil activity.
Area of Science:
- Pulmonary biology
- Cellular immunology
- Respiratory medicine
Background:
- Intercellular adhesion molecule-1 (ICAM-1) plays a role in immune cell interactions within the lung.
- Understanding ICAM-1 distribution is crucial for comprehending lung inflammation and injury.
Purpose of the Study:
- To investigate the distribution of ICAM-1 on alveolar epithelial cells.
- To determine the effects of hyperoxia (100% O2 exposure) on ICAM-1 expression in mouse lungs.
Main Methods:
- Electron microscopy immunocytochemistry was used to visualize ICAM-1.
- Immunoblot analysis quantified ICAM-1 levels.
- Mouse lungs were exposed to normoxia (air) or hyperoxia (100% O2) for 84 hours.
Main Results:
- In normal lungs, ICAM-1 was abundant on type I alveolar epithelial cells, particularly near cell junctions.
- Hyperoxia exposure abolished the ICAM-1 gradient near type I cell junctions.
- Hyperoxia markedly induced ICAM-1 expression on type II alveolar epithelial cells.
Conclusions:
- ICAM-1 is primarily located on type I epithelial cell surfaces near cell junctions in normal lungs.
- Hyperoxia significantly alters ICAM-1 distribution on type I cells and induces its expression on type II cells.
- These changes in ICAM-1 may influence neutrophil recruitment and retention in the alveolar space during hyperoxic lung injury.