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Related Experiment Videos

[Endorphins: structure, roles and biogenesis].

M Chrétien, N G Seidah, H Scherrer

    Canadian Journal of Physiology and Pharmacology
    |May 1, 1981
    PubMed
    Summary
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    Hormonal precursors like beta-lipotropin (beta-LPH) were discovered, leading to the identification of endorphins. These endogenous opioid ligands, including beta-endorphin, are derived from a larger precursor, pro-opiomelanocortin, and modulate pain and behavior.

    Area of Science:

    • Biochemistry
    • Neuroscience
    • Endocrinology

    Context:

    • The discovery of beta-lipotropin (beta-LPH) and gamma-LPH sequences initiated the concept of hormonal precursors.
    • Research on opiates and pituitary lipotropic hormones converged with the discovery of endorphins.

    Purpose:

    • To explore the existence of endogenous opioid ligands and their precursor molecules.
    • To investigate the role of endorphins as neuromodulators in pain, behavior, and endocrine regulation.

    Summary:

    • The identification of beta-lipotropin (beta-LPH) led to the hypothesis of hormonal precursors, later extended to proinsulin and other hormones.
    • Endorphins, including enkephalins and beta-endorphin, were discovered and found to be structurally homologous to pituitary lipolytic hormones.
    • Pro-opiomelanocortin (POMC) was identified as a precursor for beta-endorphin, ACTH, and MSH, with pulse-chase experiments confirming beta-endorphin as a maturation product.

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    Impact:

    • Endorphins are implicated as neuromodulators in pain transmission, analgesia, tolerance, dependence, behavior, and endocrine regulation.
    • Understanding endorphin biosynthesis is crucial for comprehending their biological and regulatory functions.
    • These findings offer potential tools for studying central nervous system functions and diseases like pain and behavioral disorders.