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Kanamycin depletes cochlear polyamines in the developing rat

C M Henley1

  • 1Department of Otorhinolaryngology/Communicative Sciences and Pharmacology, Baylor College of Medicine, Houston, TX 77030.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|January 1, 1994
PubMed
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Developing mammals show heightened sensitivity to aminoglycoside ototoxicity during cochlear maturation. This study reveals impaired polyamine synthesis, suggesting a mechanism for this developmental hypersensitivity.

Area of Science:

  • Ototoxicology
  • Developmental Biology
  • Neuroscience

Background:

  • Developing mammals exhibit increased susceptibility to ototoxic agents like aminoglycoside antibiotics.
  • Maximum sensitivity coincides with the cochlea's anatomic and functional maturation, particularly during the second and third postnatal weeks in rats.
  • Aminoglycoside ototoxicity initially manifests as outer hair cell (OHC) damage in the basal cochlea, detectable via distortion-product otoacoustic emissions (DPOAEs).

Purpose of the Study:

  • To investigate the underlying mechanism of developmental hypersensitivity to aminoglycoside-induced ototoxicity.
  • To explore the role of the ornithine decarboxylase (ODC)-polyamine pathway in mediating this heightened sensitivity.
  • To characterize the polyamine response to aminoglycoside exposure during the critical developmental period.

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Main Methods:

  • Assessing outer hair cell (OHC) function using distortion-product otoacoustic emissions (DPOAEs) in developing rats.
  • Measuring ornithine decarboxylase (ODC) activity in the cochlea.
  • Analyzing polyamine levels (spermidine, spermine, putrescine) in the organ of Corti following aminoglycoside administration.

Main Results:

  • Aminoglycoside exposure during development led to an incomplete polyamine response in the organ of Corti.
  • Specifically, spermidine and spermine levels were inhibited, while putrescine accumulated.
  • These findings suggest aminoglycoside-induced inhibition of polyamine synthesis occurs during development.

Conclusions:

  • Aminoglycoside ototoxicity in developing mammals may be mediated by the disruption of polyamine synthesis.
  • Interference with polyamine pathways, crucial for developmental and repair processes, likely underlies the observed hypersensitivity.
  • Targeting the ODC-polyamine pathway could offer strategies to mitigate developmental ototoxicity.