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Related Experiment Videos

Are calcitonins analgesic and/or hyperalgesic?

P Giusti, M Carrara, S Zampiron

    Peptides
    |January 1, 1985
    PubMed
    Summary

    Calcitonin administration in mice induced peripheral analgesia via ICV, IV, and IP routes, but central administration via IP route caused hyperalgesia. Calcium ions modulated these effects, suggesting a complex role in pain perception.

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    Area of Science:

    • Pharmacology
    • Neuroscience
    • Pain Research

    Background:

    • Calcitonin is a hormone known for its role in calcium regulation and bone metabolism.
    • The analgesic properties of calcitonin have been investigated, but its effects on central versus peripheral pain pathways require further clarification.

    Purpose of the Study:

    • To evaluate the peripheral and central analgesic effects of different calcitonin administration routes in mice.
    • To investigate the role of calcium in mediating calcitonin-induced changes in pain perception.

    Main Methods:

    • Utilized the acetylcholine writhing test for peripheral analgesia assessment.
    • Employed the hot plate test to evaluate central analgesic or hyperalgesic responses.
    • Administered porcine, salmon, and human calcitonins via intracerebroventricular (ICV), intravenous (IV), intraperitoneal (IP), and subcutaneous (SC) routes.

    Main Results:

    • ICV and IV calcitonin injections produced sustained peripheral analgesia.
    • IP administration of calcitonin resulted in dose-dependent peripheral analgesia with a slow onset but potent effect.
    • IP calcitonin surprisingly induced a central hyperalgesic effect, which was antagonized by EDTA and potentiated by calcium (Ca++).
    • Calcium (Ca++) administration via ICV produced strong and long-lasting analgesia.

    Conclusions:

    • Calcitonin exhibits distinct peripheral analgesic effects depending on the route of administration.
    • Intraperitoneal calcitonin elicits a paradoxical central hyperalgesic effect, modulated by calcium.
    • Calcium plays a crucial and differential role in modulating calcitonin's effects on central and peripheral pain pathways.

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