Oxidative stress in otosclerosis

Area of Science:

• Otorhinolaryngology
• Biochemistry
• Pathophysiology

Background:

• Otosclerosis is characterized by abnormal bone remodeling in the otic capsule, leading to hearing loss.
• The precise etiology of otosclerosis remains incompletely understood, with various hypotheses proposed.
• Oxidative stress is implicated in numerous pathological processes, but its role in otosclerosis requires further elucidation.

Purpose of the Study:

• To investigate the association between otosclerosis and markers of oxidative stress.
• To compare serum levels of oxidative stress indicators between otosclerosis patients and healthy individuals.
• To assess the status of antioxidant defense mechanisms in the context of otosclerosis.

Main Methods:

• Serum samples from otosclerosis patients and control subjects were analyzed.
• Levels of paraoxonase-1 (PON1), arylesterase, total antioxidant status, total oxidant status (TOS), and oxidative stress index (OSI) were measured.
• Other oxidative stress markers including sulfhydryl groups, lipid hydroperoxide, and ceruloplasmin were also evaluated.

Main Results:

• Otosclerosis patients exhibited significantly higher levels of TOS and OSI compared to healthy controls.
• Reduced levels of PON1 were observed in otosclerosis patients, indicating severe oxidative stress.
• The findings suggest a depletion of antioxidant capacity in individuals with otosclerosis.

Conclusions:

• An imbalance favoring reactive oxygen species production over antioxidant defenses likely contributes to otosclerosis.
• Increased oxidative stress may lead to cellular and tissue damage via lipid peroxidation.
• This study provides evidence for the involvement of oxidative stress in the pathogenesis of otosclerosis.