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beta-endorphin is a potent analgesic agent

H H Loh, L F Tseng, E Wei

    Proceedings of the National Academy of Sciences of the United States of America
    |August 1, 1976
    PubMed
    Summary
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    Beta-endorphin, a potent pain reliever, demonstrates significant antinociceptive effects when administered centrally. Its pain-blocking action is stronger than morphine and reversible with naloxone hydrochloride.

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Pain Research

    Background:

    • Beta-endorphin is an endogenous opiate-like peptide.
    • Understanding its role in pain modulation is crucial.

    Purpose of the Study:

    • To investigate the antinociceptive properties of beta-endorphin.
    • To compare its potency with morphine and other peptides.

    Main Methods:

    • Central administration of beta-endorphin in mice and rats.
    • Assays included tail-flick, hot-plate, writhing, and wet shake tests.
    • Opiate antagonist naloxone hydrochloride was used to block activity.

    Main Results:

    • Beta-endorphin exhibited potent antinociceptive effects in vivo.

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  • It was 18 to 33 times more potent than morphine on a molar basis.
  • Naloxone hydrochloride specifically blocked beta-endorphin's actions.

    • Conclusions:

    • Central beta-endorphin is a powerful endogenous analgesic.
    • Its mechanism of action involves opioid receptors.
    • Further research can explore its therapeutic potential in pain management.