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GABA and its agonists improved visual cortical function in senescent monkeys.

Audie G Leventhal1, Yongchang Wang, Mingliang Pu

  • 1Department of Neurobiology and Anatomy, University of Utah School of Medicine, Salt Lake City, UT 84132, USA. audie.leventhal@m.cc.utah.edu

Science (New York, N.Y.)
|May 6, 2003
PubMed
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Aging impairs brain function due to reduced inhibition. Restoring gamma-aminobutyric acid (GABA) signaling improved visual processing in older monkeys, suggesting potential treatments for age-related declines.

Area of Science:

  • Neuroscience
  • Aging Research
  • Sensory Processing

Background:

  • Human cerebral cortical function declines with age.
  • This decline is linked to reduced intracortical inhibition during senescence.
  • Understanding these changes is crucial for addressing age-related functional impairments.

Purpose of the Study:

  • To investigate the role of gamma-aminobutyric acid (GABA) mediated inhibition in age-related decline of V1 cortical function.
  • To assess the effects of GABA, muscimol (GABAa agonist), and bicuculline (GABAa antagonist) on neuronal properties in old monkeys.
  • To explore therapeutic potential of enhancing GABAergic function for age-related sensory deficits.

Main Methods:

  • Utilized multibarreled microelectrodes for precise drug delivery in V1 cortex of old monkeys.

Related Experiment Videos

  • Electrophoretically applied GABA, muscimol, and bicuculline to individual V1 cells.
  • Compared neuronal responses in old monkeys to established data from young animals.

    • Main Results:

    • Bicuculline showed significantly weaker effects on neuronal responses in old compared to young animals, confirming degraded GABA-mediated inhibition.
    • Administration of GABA and muscimol improved visual function in old monkeys.
    • Many treated V1 cells in old animals exhibited neuronal response properties similar to those in young animals.

    Conclusions:

    • GABAergic inhibition is compromised in the aging primate visual cortex.
    • Enhancing GABAa receptor activity can restore age-impaired neuronal function and visual processing.
    • Targeting GABAergic pathways offers a promising therapeutic strategy for age-related sensory, motor, and cognitive decline.