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Related Experiment Videos

Age-related changes in GABA(A) receptor subunit composition and function in rat auditory system.

D M Caspary1, T M Holder, L F Hughes

  • 1Southern Illinois University School of Medicine, Springfield 62794-9629, USA.

Neuroscience
|August 3, 1999
PubMed
Summary

Aging hearing loss (presbycusis) may involve changes in the GABA(A) receptor in the brain. Aged rats showed altered receptor subunits and increased function, suggesting a compensatory mechanism for declining inhibition.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neurobiology of Aging

Background:

  • Age-related hearing loss (presbycusis) impairs speech-in-noise discrimination.
  • This impairment may stem from reduced central nervous system auditory processing.
  • Functional loss of the inhibitory neurotransmitter GABA is implicated in presbycusis.

Purpose of the Study:

  • To investigate age-related changes in GABA(A) receptor subunit composition and function.
  • To examine these changes in the inferior colliculus of rats across different age groups.
  • To understand the implications of these changes for auditory processing in aging.

Main Methods:

  • Western blotting was used to quantify GABA(A) receptor subunit protein levels.
  • Microsac preparations from the inferior colliculus were used to measure GABA-mediated chloride influx.

Related Experiment Videos

  • Studies were conducted on Fischer 344 and Fischer 344/Brown-Norway F1 hybrid rats of varying ages.

    • Main Results:

    • Aged rats showed increased gamma1 and decreased alpha1 GABA(A) receptor subunit proteins.
    • GABA-mediated chloride influx was significantly elevated in aged rats' inferior colliculus.
    • These findings indicate significant age-related alterations in GABA(A) receptor composition and function.

    Conclusions:

    • Results suggest age-related changes in GABA(A) receptor composition in the inferior colliculus.
    • These alterations may represent a compensatory upregulation of inhibitory function.
    • This study highlights the plasticity of neurotransmitter receptors during the aging process.