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Related Experiment Videos

Some pharmacological studies on the spastic mouse

T J Biscoe, J P Fry

    British Journal of Pharmacology
    |January 1, 1982
    PubMed
    Summary

    Diazepam, flunitrazepam, and sodium valproate effectively reduced muscle rigidity in spastic mice. These findings suggest that enhancing GABA-mediated inhibition may treat muscle spasticity.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Genetics

    Background:

    • Spasticity is a motor disorder characterized by increased muscle tone and exaggerated reflexes.
    • The spastic mouse model exhibits muscle rigidity without identifiable histological lesions, making it valuable for studying spasticity.
    • Understanding the pharmacological mechanisms underlying spasticity is crucial for developing effective treatments.

    Purpose of the Study:

    • To evaluate the muscle relaxant effects of various drugs on spastic mice.
    • To investigate the role of GABA-mediated pathways in spasticity.
    • To identify potential therapeutic agents for muscle rigidity.

    Main Methods:

    • Electromyography (EMG) signals from hamstring muscles of spastic mice were recorded and analyzed.
    • Drugs including benzodiazepines (diazepam, flunitrazepam, Roll-6896, Roll-6893), sodium valproate, barbiturates, diphenylhydantoin, bromocriptine, benztropine, and baclofen were administered.
    • Muscle rigidity was assessed by measuring EMG responses.
    • The effect of mild warming on drug responses was investigated.

    Main Results:

    • Diazepam and flunitrazepam produced profound and long-lasting muscle relaxant effects, superior to the vehicle control.
    • Sodium valproate and pentobarbitone also demonstrated significant muscle relaxant properties.
    • Roll-6896 exhibited muscle relaxant activity, while its enantiomer Roll-6893 did not.
    • Diphenylhydantoin and bromocriptine had minimal effects; benztropine and baclofen occasionally increased rigidity.
    • The efficacy of flunitrazepam and sodium valproate was enhanced by mild warming, suggesting a role for stretch reflex pathways.

    Conclusions:

    • The spastic mouse model exhibits hyperactivity of stretch reflexes.
    • Drugs that enhance GABA-mediated presynaptic inhibition selectively ameliorate muscle rigidity in this model.
    • Benzodiazepines, sodium valproate, and pentobarbitone show potential as therapeutic agents for spasticity.

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