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Immunologic and cytologic studies in otitis media with effusion
N Yamanaka1, Y Somekawa, T Suzuki
1Department of Otolaryngology, Sapporo Medical College, Japan.
Acta Oto-Laryngologica
|November 1, 1987
Summary
Immune complexes (ICs) involving IgG and IgA were frequently detected in middle ear effusions (MEEs) of otitis media with effusion (OME) patients. These ICs may contribute to chronic inflammation by activating complement and attracting neutrophils.
Area of Science:
- Immunology
- Otolaryngology
- Pathology
Background:
- Otitis media with effusion (OME) is a common condition, particularly in children.
- The role of immune complexes (ICs) in the middle ear's inflammatory processes remains incompletely understood.
Purpose of the Study:
- To investigate the presence and isotype distribution of immune complexes (ICs) in middle ear effusions (MEEs) from patients with otitis media with effusion (OME).
- To correlate IC detection with clinical classifications and cytologic findings in OME.
Main Methods:
- Solid-phase anti-C3 ELISA was used to detect IgG, IgM, and IgA immune complexes (ICs) in MEEs.
- Cytologic analyses of MEEs were performed on samples from 245 OME patients.
Main Results:
- IgG ICs were detected in over 50% of cases across all stages, with the highest positivity in acute OME (64%).
- IgA ICs were found in all stages, peaking in subacute cases (67%).
- In chronic OME, neutrophil-dominant MEEs showed the highest IgG IC levels and positivity (75%).
Conclusions:
- Immune complexes (ICs) are prevalent in middle ear effusions (MEEs) during otitis media with effusion (OME).
- The formation of ICs in the middle ear may prolong inflammation via complement activation and neutrophil chemotaxis.