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Expression of intercellular adhesion molecule-1 during inner ear inflammation
1Division of Otolaryngology-Head and Neck Surgery, University of California, San Diego.
The Annals of Otology, Rhinology, and Laryngology
|January 1, 1995
Summary
Intercellular adhesion molecule-1 (ICAM-1) expression on inner ear blood vessels precedes immune cell influx during inflammation. This suggests ICAM-1 plays a key role in initiating inner ear immune responses and subsequent endolymphatic hydrops.
Area of Science:
- Immunology
- Otolaryngology
- Cell Biology
Background:
- Inner ear inflammation involves immune cell infiltration.
- The role of adhesion molecules in this process is not fully understood.
- Intercellular adhesion molecule-1 (ICAM-1) is a key mediator of cell adhesion.
Purpose of the Study:
- To investigate ICAM-1 expression in the inner ear during inflammation.
- To determine the role of ICAM-1 in immune cell extravasation.
- To elucidate the relationship between ICAM-1 and endolymphatic hydrops.
Main Methods:
- Induced labyrinthitis in rats using keyhole limpet hemocyanin.
- Examined ICAM-1 expression via immunohistochemistry using a monoclonal antibody.
- Monitored immune cell influx and inner ear changes over 28 days.
Main Results:
- ICAM-1 expression was detected on spiral modiolar vein and collecting venule endothelium as early as 6 hours post-challenge.
- Peak ICAM-1 expression preceded maximal immune cell infiltration into the cochlea.
- ICAM-1 was also expressed in the endolymphatic sac and other inner ear structures, correlating with inflammation.
- Endolymphatic hydrops developed by day 28, with minimal ICAM-1 staining.
Conclusions:
- Endothelial cells in the inner ear vasculature express ICAM-1 during inflammation.
- ICAM-1 expression appears to be an early event, potentially initiating immune cell recruitment.
- The study confirms immune-induced endolymphatic hydrops as a long-term consequence.