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A betaLPH precursor model: recent developments concerning morphine-like substances.

M Chrétien, N G Seidah, S Benjannet

    Annals of the New York Academy of Sciences
    |October 28, 1977
    PubMed
    Summary
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    The pituitary gland actively synthesizes beta-lipotropin (betaLPH) and beta-endorphin, endogenous opioid peptides. Research confirms betaLPH is a precursor, with beta-endorphin identified as a key product in this biosynthesis pathway.

    Area of Science:

    • Endocrinology
    • Neuroscience
    • Biochemistry

    Background:

    • The pituitary gland is known to contain beta-lipotropin (betaLPH) and beta-endorphin.
    • The precise biosynthetic relationship and tissue distribution of these peptides have been areas of ongoing investigation.

    Purpose of the Study:

    • To investigate the biosynthesis and transformation of betaLPH into beta-endorphin within pituitary gland slices.
    • To identify and characterize newly synthesized beta-endorphin.
    • To explore the potential role of corticotropin-releasing factor (CRF) in regulating beta-endorphin release.

    Main Methods:

    • In vitro biosynthesis experiments using pituitary gland slices.
    • Identification of radioactive beta-endorphin.
    • Analysis of peptide distribution within anterior and intermediate pituitary lobes.

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    Main Results:

    • Beta-lipotropin (betaLPH) is actively biosynthesized and transformed into gamma-lipotropin (gammaLPH), releasing beta-endorphin.
    • Newly synthesized beta-endorphin was definitively identified.
    • BetaLPH and beta-endorphin are predominantly found in the intermediate pituitary lobe, but also present in the anterior lobe.
    • The structure of human beta-endorphin is identical to the COOH-fragment 61-91 of human betaLPH.
    • In rats, these morphine-like peptides may not cross the blood-brain barrier, suggesting alternative transport mechanisms into the brain.

    Conclusions:

    • The pituitary gland is the primary source of endogenous opioid substances, with betaLPH serving as the biologic precursor.
    • The study achieved the first in vitro biosynthesis of an endogenous morphine-like substance, advancing the understanding of this field.
    • Further research is needed to elucidate the exact mechanisms of beta-endorphin transport and action within the brain.