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Related Experiment Videos

L-cycloserine: a potent anticonvulsant.

S H Chung, M S Johnson, A M Gronenborn

    Epilepsia
    |June 1, 1984
    PubMed
    Summary

    L-cycloserine, a transaminase inhibitor, demonstrates anticonvulsant effects by altering brain amino acid levels. It forms a complex with pyridoxal-5'-phosphate and zinc, reducing seizure susceptibility in mice.

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    Biochemistry·2001

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Biochemistry

    Background:

    • Epilepsy is a neurological disorder characterized by recurrent seizures.
    • Transaminase inhibitors can modulate neurotransmitter levels.
    • Pyridoxal-5 -phosphate (PLP) and Zn2+ play roles in neuronal excitability.

    Purpose of the Study:

    • To investigate the anticonvulsant properties of L-cycloserine.
    • To elucidate the mechanism underlying L-cycloserine's anticonvulsant action.

    Main Methods:

    • Administered L-cycloserine to DBA/2J and CBA/Ca mice.
    • Induced seizures using Zn2+ and PLP in normal mice.
    • Measured amino acid concentrations (glutamate, aspartate, gamma-aminobutyrate) in the inferior colliculus.
    • Analyzed the interaction between L-cycloserine, PLP, and Zn2+ using proton nuclear magnetic resonance (NMR) spectroscopy.

    Main Results:

    • L-cycloserine (25 mg kg-1) protected epileptic mice from convulsions.
    • L-cycloserine administration reduced seizure susceptibility induced by Zn2+ and PLP.
    • Treatment led to decreased glutamate and aspartate, and increased gamma-aminobutyrate concentrations in the inferior colliculus.
    • NMR analysis confirmed the formation of an irreversible Schiff base adduct between L-cycloserine and PLP, stabilized by Zn2+.

    Conclusions:

    • L-cycloserine exhibits significant anticonvulsant activity.
    • The mechanism involves modulation of excitatory and inhibitory neurotransmitters.
    • The formation of a stable L-cycloserine-PLP-Zn2+ complex is crucial for its therapeutic effect.

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