title: Human colon produces fully processed glucagon-like peptide-1 (7-36) amide.
abstract: The human colon contains many open-type endocrine cells which express the preproglucagon gene and possess glucagon-like peptide-1 (GLP-1) immunoreactivity, but the molecular form of the peptide is unknown. Acid ethanol extracts of human colon (n = 4) were subjected to gel filtration and successive purification by high-pressure liquid chromatography, monitored by specific RIAs. A single GLP-1-immunoreactive peak was isolated and identified as GLP-1 (7-36)amide by amino acid sequence analysis and mass spectrometry. We conclude that proglucagon is processed in the large intestine in the same manner as in the small intestine, and results in the formation of fully processed biologically active GLP-1.
authors.affiliation: Department of Medical Physiology, Panum Institute, University of Copenhagen, Denmark.
authors.forename: C F
authors.initials: CF
authors.lastname: Deacon
authors.forename: A H
authors.initials: AH
authors.lastname: Johnsen
authors.forename: J J
authors.initials: JJ
authors.lastname: Holst
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003106:Colon / Q000378:metabolism*; D005934:Glucagon / Q000096:biosynthesis* / Q000302:isolation & purification; D052216:Glucagon-Like Peptide 1; D006801:Humans; D010446:Peptide Fragments / Q000096:biosynthesis* / Q000302:isolation & purification; D052336:Proglucagon; D011498:Protein Precursors / Q000096:biosynthesis* / Q000302:isolation & purification
chemical_list: D010446:Peptide Fragments; D011498:Protein Precursors; D052336:Proglucagon; D052216:Glucagon-Like Peptide 1; D005934:Glucagon