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Physiological Recordings of High and Low Output NMJs on the Crayfish Leg Extensor Muscle
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Physiological Recordings of High and Low Output NMJs on the Crayfish Leg Extensor Muscle

Published on: November 17, 2010

Effects of memantine on the frog neuromuscular junction

K Masuo, K Enomoto, T Maeno

    European Journal of Pharmacology
    |November 4, 1986
    PubMed

    Insights

    Memantine, an adamantane derivative, impairs neuromuscular transmission by affecting postsynaptic acetylcholine receptors. This drug reduces endplate current amplitude and duration, acting as a mixed-type inhibitor of the acetylcholine receptor-ion channel complex.

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Muscle Physiology

    Background:

    • Neuromuscular transmission is crucial for muscle function.
    • Memantine is an adamantane derivative with potential effects on neuronal signaling.

    Purpose of the Study:

    • To investigate the effects of memantine on neuromuscular transmission.
    • To elucidate the mechanism of memantine's action at the postsynaptic level.

    Main Methods:

    • Studied frog sartorius muscle preparation.
    • Measured endplate current (EPC) using voltage clamp technique.
    • Performed noise analysis and lineweaver-Burk analysis.

    Main Results:

    • Memantine reduced EPC peak amplitude and shortened EPC duration.
    • Observed a non-linear membrane voltage-peak EPC relationship.
    • Decreased quantal height without altering mean quantal content.
    • Reduced the mean open-channel lifetime of acetylcholine-activated channels.
    • Acted as a linear mixed-type inhibitor of carbamylcholine response.

    Conclusions:

    • Memantine primarily exerts postsynaptic effects on neuromuscular transmission.
    • The drug appears to block transmission by interacting with the acetylcholine receptor-ion channel complex in both open and closed states.

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