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Calpain and caspase inhibitors protect vestibular sensory cells from gentamicin ototoxicity

Akira Shimizu1, Masaya Takumida, Matti Anniko

  • 1Department of Otolaryngology, Tokyo Medical University, Tokyo, Japan. chachi@v006.vaio.ne.jp

Acta Oto-Laryngologica
|June 12, 2003
PubMed
Abstract

Insights

Aminoglycoside ototoxicity, a common side effect, can be blocked by inhibiting apoptosis. Caspase and calpain inhibitors protected inner ear hair cells from gentamicin-induced damage in a guinea pig study.

Area of Science:

  • Ototoxicity research
  • Cell death mechanisms
  • Inner ear biology

Background:

  • Aminoglycoside ototoxicity is a significant clinical concern.
  • Apoptosis, mediated by caspases and calpains, is implicated in inner ear cell death.
  • Protecting hair cells from aminoglycoside-induced damage is crucial.

Purpose of the Study:

  • To investigate the role of caspases and calpains in aminoglycoside ototoxicity.
  • To determine if caspase or calpain inhibitors can protect inner ear hair cells from gentamicin.
  • To test the hypothesis that inhibiting apoptosis prevents aminoglycoside ototoxicity.

Main Methods:

  • Pilot study using guinea pig models to assess gentamicin's effect on caspase and calpain.
  • Vestibular organ culture experiments in guinea pigs.
  • Evaluation of hair cell protection using caspase and calpain inhibitors against gentamicin.

Main Results:

  • Gentamicin treatment induced caspase-3 and m-calpain immunoreactivity in vestibular sensory cells and ganglia.
  • Both caspase and calpain inhibitors demonstrated protective effects on hair cells.
  • Evidence suggests a link between caspase/calpain activity and gentamicin-induced hair cell death.

Conclusions:

  • Inhibition of apoptosis is a key strategy to prevent aminoglycoside ototoxicity.
  • Caspase and calpain pathways are critical targets for mitigating gentamicin-induced ototoxicity.
  • Targeting apoptosis offers a potential therapeutic avenue for ototoxicity management.

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