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Complement activation in pediatric patients with recurrent acute otitis media.
Yujuan He1, Melissa A Scholes, Gregory J Wiet
1Department of Otolaryngology, College of Medicine and Public Health, The Ohio State University, Columbus, OH 43210, USA.
International Journal of Pediatric Otorhinolaryngology
|March 30, 2013
Summary
Complement activation in the middle ear plays a dual role in recurrent acute otitis media (rAOM). Understanding these pathways can help prevent hearing loss and inflammation in children.
Area of Science:
- Immunology
- Otolaryngology
- Pediatrics
Background:
- Otitis media (OM) is a common childhood illness with unknown roles for complement activation in its development.
- Recurrent acute otitis media (rAOM) can lead to complications like hearing loss.
Purpose of the Study:
- Investigate the beneficial and detrimental roles of complement activation in pediatric rAOM.
- Identify targets for preventing OM sequelae, such as hearing loss.
Main Methods:
- Analyzed middle ear effusion (MEE) and serum from 20 children with rAOM.
- Used ELISA and Western blot to measure complement components (C3a, C5a, sC5-b9) and cytokines (IL-6, IL-8).
- Assessed complement gene expression in human middle ear epithelial cells exposed to otopathogens.
Main Results:
- Demonstrated activation of classical/lectin, alternative, and terminal complement pathways in the middle ear.
- Elevated C3a, C5a, and sC5-b9 levels correlated with longer rAOM episodes (>6 weeks).
- Found a strong correlation between C5a and IL-6/IL-8; otopathogens upregulated complement gene expression in middle ear cells.
Conclusions:
- Complement activation significantly contributes to the inflammatory process in rAOM.
- Targeting specific complement pathways may offer new strategies to prevent inflammatory tissue damage and hearing loss in rAOM.
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