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Minocycline prevents gentamicin-induced ototoxicity by inhibiting p38 MAP kinase phosphorylation and caspase 3

X Wei1, L Zhao, J Liu

  • 1Department of Neurology, School of Medicine, Indiana University, 975 West Walnut Street IB 457, Indianapolis, IN 46202, USA.

Neuroscience
|February 15, 2005
PubMed

Insights

Minocycline protects against gentamicin-induced ototoxicity by preventing hair cell damage. This antibiotic may offer a novel therapeutic strategy for preventing aminoglycoside-induced inner ear injury.

Area of Science:

  • Ototoxicity research
  • Cellular and molecular biology
  • Pharmacology

Background:

  • Aminoglycosides are antibiotics frequently causing ototoxicity, leading to irreversible hearing loss.
  • Ototoxicity results in hair cell damage and subsequent hearing impairment.

Purpose of the Study:

  • To investigate the protective effects of minocycline against gentamicin-induced hair cell damage.
  • To elucidate the molecular mechanisms underlying minocycline's protective action.

Main Methods:

  • Utilized gentamicin to induce outer hair cell damage in explants.
  • Administered minocycline in varying doses to assess its protective efficacy.
  • Analyzed gentamicin-induced molecular changes, including p38 MAPK phosphorylation, cytochrome c release, and caspase 3 activation.
  • Investigated the effects of specific inhibitors for p38 MAPK and caspase 3.

Main Results:

  • Gentamicin significantly damaged outer hair cells.
  • Minocycline treatment dose-dependently increased hair cell survival.
  • Minocycline inhibited gentamicin-induced p38 MAPK phosphorylation, cytochrome c release, and caspase 3 activation.
  • Inhibitors of p38 MAPK and caspase 3 provided partial protection, with combined inhibition showing a synergistic effect.

Conclusions:

  • Minocycline protects hair cells from gentamicin-induced damage by inhibiting p38 MAPK phosphorylation, cytochrome c release, and caspase 3 activation.
  • These findings suggest minocycline's potential as a therapeutic agent to prevent aminoglycoside-induced ototoxicity.
  • Minocycline's protective activity may extend to other apoptotic models.

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