Radioimmunoassay of pancreatic polypeptide in mammalian and submammalian vertebrates using a carboxyl-terminal hexapeptide antiserum

George H. Greeley, John Trowbridge, Jeff Burdett, Freddie L.C. Hill, Alan Spannagel, James C. Thompson

    Research output: Contribution to journalArticle

    15 Scopus citations

    Abstract

    Pancreatic polypeptide (PP) immunoreactivity in acid-ethanol extracts of the pancreas of representative species of mammals, birds, reptiles, amphibians, and fish was studied by a radioimmunoassay (RIA) that utilizes an antiserum which cross-reacts exclusively with the COOH-terminal hexapeptide of PP (CTPP). PP immunoreactivity in acid-ethanol extracts of rat nonpancreas tissues (stomach, duodenum, skeletal muscle, brain) was also examined. Significant concentrations of PP immunoreactivity were detected in the pancreatic extracts of all species, except fish. Appreciable quantities of PP immunoreactivity were also found in the stomach and duodenum of rats. In all cases, tissue extracts showed parallelism with reference PP (bovine) in the RIA. Gel chromatography (Sephadex G-50sf) of tissue extracts (rat, turtle) demonstrated a major peak of PP immunoreactivity, which eluted in the region of the reference PP. Salamander PP immunoreactivity eluted after bovine PP. In addition, the CTPP RIA can be applied to measure plasma levels of PP in rats, dogs, and humans. By using this PP RIA, we observed that plasma PP levels increase significantly in dogs (P < 0.05) after intravenous administration of neurotensin. In rats, administration of intravenous bombesin resulted in a significant elevation of plasma PP.

    Original languageEnglish (US)
    Pages (from-to)177-187
    Number of pages11
    JournalRegulatory Peptides
    Volume8
    Issue number3
    DOIs
    StatePublished - Apr 1984

    Keywords

    • distribution
    • gastrointestinal
    • pancreas
    • plasma
    • rat

    ASJC Scopus subject areas

    • Biochemistry
    • Physiology
    • Endocrinology
    • Clinical Biochemistry
    • Cellular and Molecular Neuroscience

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