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Placental beta-endorphin-like peptides

J C Houck, C Kimball, C Chang

    Science (New York, N.Y.)
    |January 4, 1980
    PubMed
    Summary

    Human placenta contains beta-endorphin precursors. These macromolecular precursors release beta-endorphin-like material, differing in size from pituitary hormones.

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    Area of Science:

    • Biochemistry
    • Endocrinology
    • Molecular Biology

    Background:

    • Human placental tissue contains biologically active substances.
    • Opioid peptides, such as beta-endorphin, play significant roles in various physiological processes.
    • Understanding the source and nature of these peptides is crucial for reproductive biology and pain management.

    Purpose of the Study:

    • To characterize the beta-endorphin-like material present in human placental acid extracts.
    • To investigate the molecular size and potential precursor forms of beta-endorphin in the placenta.

    Main Methods:

    • Acid extraction of human placental tissue.
    • Radioimmunoassay and radioreceptor assays for beta-endorphin-like material detection.
    • Size exclusion chromatography (Sephadex G-200, Sephadex G-25) and ultrafiltration to determine molecular size.

    Main Results:

    • Human placental extracts contain beta-endorphin-like material detected by both radioimmunoassay and radioreceptor assay.
    • A significant portion of this material exhibited a high molecular weight (25,000–50,000 daltons) and did not pass a 5000-dalton filter.
    • A smaller fraction, passing the 5000-dalton filter, indicated a molecular size of approximately 4500–4800 daltons.

    Conclusions:

    • Human placenta possesses macromolecular precursors that release beta-endorphin-like substances.
    • The placental beta-endorphin-like material appears to be derived from larger molecules, suggesting a processing pathway.
    • The characterized placental beta-endorphin-like material differs in size from pituitary beta-endorphin, indicating distinct forms or precursors.

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