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Nitrotyrosine in otitis media with effusion.
Ken-ichi Hisamatsu1, Hajime Inoue, Kiyoshi Makiyama
1Department of Otorhinolaryngology, Nihon University Surugadai Hospital, Tokyo, Japan.
The Annals of Otology, Rhinology, and Laryngology
|November 16, 2005
Summary
The nitric oxide (NO)-superoxide system contributes to cell injury in otitis media with effusion. Higher nitrotyrosine levels were observed in younger patients and acute cases, indicating oxidative stress.
Area of Science:
- Otorhinolaryngology
- Biochemistry
- Cell Biology
Background:
- Otitis media with effusion (OME) is a common condition, particularly in children.
- The role of oxidative stress in OME pathogenesis requires further elucidation.
Observation:
- This study analyzed 90 middle ear fluid samples from patients with OME.
- Key biomarkers including nitrotyrosine (NT), nitric oxide (NO), superoxide dismutase (SOD), and lactic dehydrogenase (LDH) were quantified.
Findings:
- Elevated NT concentrations were found in younger patients (<16 years) and those with acute OME compared to older patients (>50 years) and chronic OME, respectively.
- SOD activity correlated significantly with NT and NO levels, and LDH activity, suggesting its involvement in the oxidative stress pathway.
- LDH activity was notably higher in younger patients.
Implications:
- The findings suggest the nitric oxide-superoxide system plays a significant role in the molecular mechanisms underlying OME.
- Evidence of protein and cellular damage in the middle ear points to oxidative stress as a contributing factor to OME pathology.