Ebselen attenuates cochlear damage caused by acoustic trauma

Area of Science:

• Ototoxicity and neuroprotection research
• Auditory science
• Pharmacology of seleno-organic compounds

Background:

• Ebselen (2-phenyl-1,2-benzisoselenazol-3(2H)-one) is a seleno-organic compound with glutathione peroxidase-mimicking properties.
• Previous studies suggest ebselen protects against gentamicin- and cisplatin-induced ototoxicity.
• The potential of ebselen to mitigate cochlear damage from acoustic trauma remains unexplored.

Purpose of the Study:

• To investigate the protective effects of ebselen against noise-induced cochlear damage in guinea pigs.
• To evaluate the efficacy of ebselen in preventing hearing threshold shifts and hair cell loss following acoustic trauma.
• To assess the dose-dependent protective effect of ebselen.

Main Methods:

• Male guinea pigs were exposed to octave band noise (125 dB SPL, 4 kHz) for 5 hours.
• Ebselen was administered orally at doses of 10 or 30 mg/kg before and after noise exposure.
• Auditory brainstem response (ABR) thresholds and quantitative hair cell counts were used to assess protection.

Main Results:

• Ebselen treatment significantly reduced permanent threshold shifts and outer hair cell loss (P<0.01).
• A dose of 10 mg/kg ebselen demonstrated a greater protective effect than 30 mg/kg.
• No adverse systemic or auditory effects were observed in control animals treated with 30 mg/kg ebselen.

Conclusions:

• Ebselen attenuates noise-induced cochlear damage.
• The optimal protective concentration of ebselen against acoustic trauma requires further determination.
• Ebselen shows potential as a therapeutic agent for preventing noise-induced hearing loss.