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Expression of human intercellular adhesion molecules in middle ear cholesteatoma
1Department of Otorhinolaryngology, Ludwig-Maximilians-University of Munich, Germany.
Insights
Intercellular adhesion molecules (ICAM-1 and ICAM-2) are significantly elevated in cholesteatoma, indicating their crucial role in the inflammatory processes associated with this condition.
Area of Science:
- Immunology
- Dermatology
- Otolaryngology
Background:
- Cell adhesion molecules mediate cell-cell interactions, crucial for immune responses.
- Middle ear cholesteatoma features significant leukocyte infiltration.
- Intercellular Adhesion Molecule-1 (ICAM-1) and ICAM-2 roles in cholesteatoma were unexplored.
Purpose of the Study:
- To investigate the presence and expression of ICAM-1 and ICAM-2 in cholesteatoma.
- To compare ICAM expression in cholesteatoma with normal skin.
Main Methods:
- Tissue sections from cholesteatoma (n=10) and normal skin (n=5) were analyzed.
- Alkaline-phosphatase-anti-alkaline-phosphatase (APAAP) staining was employed.
- Monoclonal antibodies against ICAM-1 and ICAM-2 were used.
Main Results:
- ICAM-1 and ICAM-2 were detected in normal skin's endothelial and dermal cells.
- Cholesteatoma exhibited significantly increased ICAM-1 expression compared to normal skin.
- Infiltrating immune cells in cholesteatoma were positive for both ICAM-1 and ICAM-2; vessel cells showed heightened staining intensity.
Conclusions:
- ICAM-1 and ICAM-2 are upregulated in middle ear cholesteatoma.
- These molecules likely play a key role in regulating the inflammatory response in cholesteatoma.
Introduction:
Cell adhesion molecules are cell surface proteins that allow specific cell-cell interactions among leukocytes, as well as between leukocytes and other cells. Because middle ear cholesteatoma is characterized by the presence of leukocyte infiltrates, the presence of the two molecule types of intercellular adhesion molecules (ICAM-1 and ICAM-2) was investigated on cholesteatoma using monoclonal antibodies.
Methods:
Tissue sections from 10 patients with cholesteatoma, and normal skin from 5 patients were prepared for alkaline-phosphatase--anti-alkaline-phosphatase (APAAP) staining.
Results:
ICAM-1 and ICAM-2 were present in normal skin in microvascular endothelial cells and in intersticial cells of the dermis. Cholesteatoma showed a very important increase of the ICAM-1 expression with comparison to human skin. All infiltrating immune cells showed positive reactions for the antibody. Furthermore, the intensity of the staining of vessels cells was higher than in normal skin. Keratinocytes were only positive if a very heavy infiltrate was present subepidermally. ICAM-2 was present in endothelial and intersticial cells in normal skin and in cholesteatoma. Most of the infiltrating cells in the cholesteatoma stroma showed positive reactions for the anti-ICAM-2 antibody.
Conclusion:
Our results suggest that both ICAM-1 and ICAM-2 play a central role in the regulation of the inflammatory disorders observed in cholesteatoma.
