Role of glutathione in protection against noise-induced hearing loss

Tatsuya Yamasoba, Alfred L. Nuttall, Craig Harris, Yehoash Raphael, Josef M. Miller

Research output: Contribution to journalArticle

140 Scopus citations

Abstract

A potential mechanism of hearing loss due to acoustic overstimulation is the generation of reactive oxygen species (ROS). ROS not removed by antioxidant defenses could be expected to cause significant damage to the sensory cells of the cochlea. We studied the influence of the antioxidant glutathione (GSH) on noise-induced hearing loss by using L-buthionine-[S,R]- sulfoximine (BSO), an inhibitor of GSH synthesis, and 2-oxothiazolidine-4- carboxylate (OTC), a cysteine prodrug, which promotes rapid restoration of GSH when GSH is acutely depleted. Pigmented female guinea pigs were exposed to broadband noise (102 dB SPL, 3 h/day, 5 days) while receiving daily injections of BSO, OTC, or saline. By weeks 2 and 3 after noise exposure, BSO-treated animals showed significantly greater threshold shifts above 12 kHz than saline-treated subjects, whereas OTC-treated animals showed significantly smaller threshold shifts at 12 kHz than controls. Histologically assessed noise-induced damage to the organ of Corti, predominantly basal turn row 1 outer hair cells, was most pronounced in BSO- treated animals. High performance liquid chromatographic analysis showed that OTC significantly increased cysteine levels, but not GSH levels, in the cochlea. These findings show that GSH inhibition increases the susceptibility of the cochlea to noise-induced damage and that replenishing GSH, presumably by enhancing availability of cysteine, attenuates noise-induced cochlear damage.

Original languageEnglish (US)
Pages (from-to)82-90
Number of pages9
JournalBrain research
Volume784
Issue number1-2
DOIs
StatePublished - Feb 16 1998

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Keywords

  • Buthionine
  • Cochlea
  • Cysteine
  • Glutathione
  • Guinea pig
  • Noise- induced hearing loss
  • Oxothiazolidine carboxylate
  • Reactive oxygen species

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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