title: Islet amyloid polypeptide in the gut and pancreas: localization, ontogeny and gut motility effects.
abstract: The occurrence of islet amyloid polypeptide (IAPP) in the gut and pancreas of several species and during ontogeny of the rat, was studied using immunocytochemistry. Effects of IAPP on rat ileal smooth muscle were assessed in vitro. Islets of most, but not all, species examined, displayed IAPP in insulin cells and, in some species, also in somatostatin- and peptide YY (PYY)-containing cells. In the gut, expression of IAPP varied among species; when present, IAPP was most abundant in the proximal part and co-localized with somatostatin, PYY, gastrin/cholecystokinin, enteroglucagon or serotonin. IAPP was first demonstrated at embryonic day 12 and 16 in islet and gastrointestinal endocrine cells, respectively. IAPP relaxed gut muscle and reduced electrical field stimulation-evoked contractions, presumably by inhibiting acetylcholine release. Thus, IAPP expression in islets is consistent with an important role for IAPP in fuel metabolism; the gastrointestinal expression and motor effects of IAPP suggest that IAPP may modulate gastrointestinal function.
authors.affiliation: Department of Physiology and Neuroscience, University of Lund, Lund University Hospital, Sweden. hindrik.mulder@mphy.lu.se
authors.forename: H
authors.initials: H
authors.lastname: Mulder
authors.forename: M
authors.initials: M
authors.lastname: Ekelund
authors.forename: E
authors.initials: E
authors.lastname: Ekblad
authors.forename: F
authors.initials: F
authors.lastname: Sundler
mesh_terms: D000682:Amyloid / Q000096:biosynthesis* / Q000502:physiology; D000818:Animals; D002023:Bufo bufo; D002415:Cats; D002645:Chickens; D006224:Cricetinae; D004285:Dogs; D019858:Enteroendocrine Cells / Q000378:metabolism / Q000502:physiology; D005260:Female; D019084:Fluorescent Antibody Technique, Indirect; D005769:Gastrointestinal Motility; D006168:Guinea Pigs; D006801:Humans; D007082:Ileum / Q000378:metabolism* / Q000502:physiology; D066298:In Vitro Techniques; D058228:Islet Amyloid Polypeptide; D007515:Islets of Langerhans / Q000378:metabolism* / Q000502:physiology; D051379:Mice; D009130:Muscle, Smooth / Q000378:metabolism / Q000502:physiology; D019894:Peptide YY / Q000032:analysis; D011817:Rabbits; D011896:Rana temporaria; D051381:Rats; D017207:Rats, Sprague-Dawley; D012756:Sheep; D013004:Somatostatin / Q000032:analysis; D019864:Somatostatin-Secreting Cells / Q000378:metabolism / Q000502:physiology; D013045:Species Specificity; D013552:Swine
chemical_list: D000682:Amyloid; D058228:Islet Amyloid Polypeptide; D019894:Peptide YY; D013004:Somatostatin