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Glutamate uptake by the isolated toad brain.

R P Shank, J T Whiten, C F Baxter

    Science (New York, N.Y.)
    |August 31, 1973
    PubMed
    Summary
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    The toad brain actively accumulates L-glutamate, reaching high tissue concentrations. This glutamate is quickly converted to glutamine and released, potentially maintaining low extracellular glutamate levels.

    Area of Science:

    • Neuroscience
    • Biochemistry

    Background:

    • Extracellular glutamate levels are critical for neuronal function and excitotoxicity.
    • Understanding glutamate transport and metabolism is key to brain health.

    Purpose of the Study:

    • To investigate the mechanism of L-glutamate accumulation in the isolated toad brain.
    • To determine the fate of accumulated L-glutamate within the brain tissue.

    Main Methods:

    • Isolated toad brain preparation.
    • Measurement of L-glutamate tissue-to-medium concentration ratios.
    • Analysis of glutamate conversion and release.

    Main Results:

    • The toad brain accumulates L-glutamate against a steep concentration gradient (up to 3000:1).

    Related Experiment Videos

  • Accumulated glutamate is rapidly converted to glutamine.
  • Glutamine is released into the surrounding medium.

    • Conclusions:

    • The toad brain possesses an active L-glutamate uptake system.
    • A rapid glutamate-to-glutamine conversion and release mechanism exists.
    • This process may play a role in regulating extracellular cerebral glutamate concentrations.