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Related Experiment Videos

Neuropeptides in pelvic afferent pathways.

W C de Groat

    Experientia
    |July 15, 1987
    PubMed
    Summary

    Several neuropeptides, including vasoactive intestinal polypeptide (VIP) and substance P, act as transmitters in pelvic visceral afferent pathways. These pathways modulate autonomic reflexes and smooth muscle activity.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Gastroenterology

    Background:

    • Neuropeptides are implicated as neurotransmitters in visceral afferent pathways.
    • These include vasoactive intestinal polypeptide (VIP), substance P, and opioid peptides, among others.
    • Their distribution spans pelvic organs, dorsal root ganglia, and spinal cord afferent termination sites.

    Purpose of the Study:

    • To investigate the role of neuropeptides in pelvic visceral afferent pathways.
    • To determine the localization and coexistence of multiple peptides within single neurons.
    • To elucidate the function of peptidergic pathways in autonomic reflexes and smooth muscle modulation.

    Main Methods:

    • Neurochemical and pharmacological experiments.
    • Immunocytochemical techniques for double staining.
    • Neurotoxin (capsaicin) studies.

    Main Results:

    • Multiple neuropeptides, including VIP, substance P, and CCK, are present in pelvic visceral afferent neurons.
    • Excitatory and inhibitory peptides can coexist within the same neuron.
    • Peptidergic pathways are crucial for initiating central autonomic reflexes and peripheral axon reflexes.

    Conclusions:

    • Neuropeptides are key players in pelvic visceral afferent signaling.
    • These pathways regulate smooth muscle activity, autonomic ganglia transmission, and local inflammatory responses.
    • Targeting these peptidergic pathways may offer therapeutic potential for visceral disorders.

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