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


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
Issue number3
StatePublished - 1984



  • distribution
  • gastrointestinal
  • pancreas
  • plasma
  • rat

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Physiology
  • Neuroscience(all)

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