Isoelectric focusing studies of human pancreatic secretion

Giuseppe Cassara, Elisabetta Gianazza, Pier Giorgio Righetti, Silvano Poma, Leonardo Vicentini, Vieri Scortecci

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Pure bile, pancreatic and duodenal human juices have been analyzed by isoelectric focusing, either at rest or upon stimulation with caerulein. In rats, stimulation has also been performed with secretin. Twenty bands have been resolved and quantified in the pancreatic secretion. By developing zymograms, a number of isozymes have been identified: 6 isoamylases [pI's 7.2, 7.1 and 6.6 (major) and pI's 7.4, 6.7 and 5.8 (minor)], 3 lipases [pI's 7.0 and 6.8 (major) and 6.4 (minor)], two major alkaline proteases (pI's 9.8 and 8.4) and one major acidic protease (pI 4.3) and one band of RNAase activity (pI 8.6). The stimulation kinetics follow a mechanism according to Palade, indicating uniform response to secretogogues, parallel intracellular transport and parallel discharge of pancreatic exocrine proteins.

Original languageEnglish
Pages (from-to)279-291
Number of pages13
JournalJournal of Chromatography B: Biomedical Sciences and Applications
Issue number2
Publication statusPublished - Dec 12 1980

ASJC Scopus subject areas

  • Chemistry(all)
  • Clinical Biochemistry
  • Molecular Medicine


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