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Related Experiment Videos

Common precursor to corticotropins and endorphins.

R E Mains, B A Eipper, N Ling

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1977
    PubMed
    Summary

    This study reveals that mouse pituitary tumor cells produce corticotropin (ACTH) and endorphin peptides from a common precursor molecule. These findings elucidate the complex biosynthesis of crucial peptide hormones.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Biochemistry

    Background:

    • Pituitary tumors can exhibit altered hormone production.
    • Understanding peptide hormone biosynthesis is crucial for endocrinology.

    Purpose of the Study:

    • To investigate the biosynthesis of endorphins and corticotropin (ACTH) in a mouse pituitary tumor cell line.
    • To determine if ACTH and endorphins share a common precursor molecule.

    Main Methods:

    • Double-antibody immunoprecipitation using antisera against endorphins and ACTH.
    • Incubation of cell cultures with radiolabeled amino acids.
    • Sodium dodecyl sulfate/polyacrylamide gel electrophoresis (SDS-PAGE) for molecular weight analysis.
    • Sequential immunoprecipitation and gel filtration for peptide purification.
    • Tryptic peptide mapping to compare peptide structures.

    Main Results:

    • Identified multiple molecular weight forms of both ACTH and endorphins.
    • Demonstrated that both ACTH and endorphin antisera precipitate the same 31,000-dalton precursor molecule.
    • Tryptic peptide analysis confirmed structural identity between 31,000-dalton ACTH and endorphin.
    • Identified a 11,700-dalton endorphin molecule similar to beta-lipotropin (betaLPH) and a 3500-dalton endorphin similar to beta-endorphin.
    • Observed equimolar amounts of ACTH- and endorphin-related peptides in the culture medium.

    Conclusions:

    • ACTH and endorphins are derived from a common, large precursor molecule (31,000 daltons) in this mouse pituitary tumor cell line.
    • The processing of this precursor yields various forms of ACTH and endorphin, including betaLPH and beta-endorphin.
    • The findings provide significant insight into the coordinated biosynthesis and co-secretion of these related pituitary hormones.

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