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Human female bladder and its noncholinergic contractile function.

W D Cowan, E E Daniel

    Canadian Journal of Physiology and Pharmacology
    |November 1, 1983
    PubMed
    Summary
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    Human female detrusor muscle contractions are primarily mediated by acetylcholine. A significant portion of bladder contraction is non-cholinergic, not reliant on sodium channels, and sensitive to black widow spider venom.

    Area of Science:

    • Urology
    • Neuroscience
    • Pharmacology

    Background:

    • The detrusor muscle's function in bladder contraction is complex.
    • Understanding neurotransmitter roles is crucial for treating bladder dysfunction.

    Purpose of the Study:

    • To investigate the neurotransmitters and mechanisms controlling human female detrusor muscle contraction in vitro.
    • To determine the contribution of cholinergic and non-cholinergic pathways.

    Main Methods:

    • In vitro study of human female detrusor muscle.
    • Field stimulation at varying voltages, durations, and frequencies.
    • Assessment of adrenergic and cholinergic agonists/antagonists and nerve toxins.

    Main Results:

    Related Experiment Videos

  • Beta-adrenergic receptors present; no significant adrenergic innervation or alpha-receptors found.
  • Acetylcholine contributes to ~50% of bladder contraction.
  • A non-cholinergic pathway, sensitive to black widow spider venom, accounts for the remaining ~50%.

    • Conclusions:

    • Acetylcholine is a key neurotransmitter in detrusor muscle contraction.
    • A distinct, non-cholinergic excitatory pathway exists, independent of fast sodium channels.
    • This non-cholinergic pathway's sensitivity to black widow spider venom suggests a unique neuronal mechanism.