Neuroprotective effects of T-817MA against noise-induced hearing loss

Daisuke Yamashita, Akihiro Shiotani, Sho Kanzaki, Masaya Nakagawa, Kaoru Ogawa

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Oxidative stress, including reactive oxygen species and other free radicals, is thought to play an important role in neuronal cell death, including noise-induced hearing loss. 1-{3-[2-(1-Benzothiophen-5-yl)ethoxy]propyl}azetidin-3-ol maleate (T-817MA), a novel neurotrophic agent, protects against oxidative stress-induced neurotoxicity. This study examines the effects of T-817MA in noise-induced ototoxicity in the cochlea. Guinea pigs received treatment with T-817MA-enhanced water (0.2, 0.7 mg/ml) or untreated water (control) beginning 10 days prior to noise exposure and continuing through this study. All subjects were exposed to 4-kHz octave-band noise at 120-dB SPL for 5 h. Auditory thresholds were assessed by sound-evoked auditory brainstem response at 4, 8, and 16 kHz, prior to and 10 days following noise exposure. Hair cell damage was analyzed by quantitative histology. T-817MA significantly reduced threshold deficits and hair cell death. These results suggest T-817MA reduces noise-induced hearing loss and cochlear damage, suggesting functional and morphological protection.

Original languageEnglish
Pages (from-to)38-42
Number of pages5
JournalNeuroscience Research
Issue number1
Publication statusPublished - 2008 May
Externally publishedYes


  • Antioxidant
  • Cochlea
  • Neuroprotection
  • Noise-induced hearing loss
  • Oxidative stress
  • T-817MA

ASJC Scopus subject areas

  • Neuroscience(all)


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