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Catecholamine-induced muscle weakness

M T Felmus, B M Patten, A Hart

    Archives of Neurology
    |May 1, 1977
    PubMed
    Summary
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    Catecholamines like epinephrine can impair muscle function by affecting nerve signals, not muscle tissue directly. This suggests a potential role for catecholamines in causing muscle dystrophy.

    Area of Science:

    • Neuroscience
    • Muscle Physiology
    • Pharmacology

    Background:

    • Catecholamines, including epinephrine and levarterenol bitartrate, are neurotransmitters with known physiological effects.
    • Previous research has indicated abnormal catecholamine levels in human dystrophic muscles and excessive levels in dystrophic animal models.
    • Experimental models have shown that monoamine oxidase inhibitors can induce myopathies resembling human muscular dystrophy.

    Purpose of the Study:

    • To investigate the direct effects of catecholamine infusions on skeletal muscle function in a rabbit nerve-muscle preparation.
    • To determine the role of alpha-adrenergic receptors in the observed effects of catecholamines on muscle twitch force.
    • To explore the potential pathogenetic role of catecholamines in muscular dystrophy.

    Main Methods:

    Related Experiment Videos

    • Infusion of epinephrine and levarterenol bitartrate into rabbit nerve-muscle preparations.
    • Measurement of evoked muscle twitch force in anterior tibial and gastrocnemius-soleus muscles.
    • Administration of phenoxybenzamine hydrochloride (an alpha-receptor blocker) before catecholamine infusions.

    Main Results:

    • Catecholamine infusions significantly decreased the force of evoked muscle twitches.
    • The adverse effects were mediated via nerve pathways, not direct action on skeletal muscle.
    • Phenoxybenzamine hydrochloride pretreatment blocked the inhibitory effect and revealed a mild augmentation of twitch tension.

    Conclusions:

    • Catecholamines impair skeletal muscle function through a mechanism involving nerve transmission, not direct myotoxicity.
    • The findings, combined with evidence of altered catecholamine levels in muscular dystrophy, support the hypothesis that catecholamines may contribute to the pathogenesis of certain muscle dystrophies.