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Endocrinology Vol. 139, No. 9 3780-3786
Copyright © 1998 by The Endocrine Society


ARTICLES

Peptide YY, Glucagon-Like Peptide-1, and Neurotensin Responses to Luminal Factors in the Isolated Vascularly Perfused Rat Ileum

Valérie Dumoulin, Frédéric Moro, Aline Barcelo, Taoufiq Dakka and Jean-Claude Cuber

INSERM U-45, Pavillon H bis, Hôpital Edouard Herriot, Lyon; and Unité d’Ecologie et de Physiologie du Système Digestif, Institut National de la Recherche Agronomique, Jouy-en-Josas, France

Address all correspondence and requests for reprints to: Dr. Jean-Claude Cuber, INSERM U-45, Pavillon H bis, Hôpital Edouard Herriot, 69437 Lyon Cedex 03, France. E-mail: cuber{at}lyon151.inserm.fr

Exposure of the ileum to nutrients markedly inhibits several upper gastrointestinal functions. Hormonal peptides of the ileal wall, i.e. peptide YY (PYY), glucagon-like peptide-1 (GLP-1), and neurotensin (NT), are thought to play a role in this negative feedback mechanism. The present study was conducted to comparatively assess the secretion of PYY, GLP-1, and NT upon luminal infusion of a variety of individual luminal factors in the isolated vascularly perfused rat ileum preparation. PYY, GLP-1, and NT were measured in the portal effluent with specific RIAs. Glucose (250 mM) induced a pronounced release of the three peptides, whereas a physiological concentration of 5 mM did not induce peptide secretion. Peptone (5%, wt/vol) evoked a sustained release of PYY, GLP-1, and NT. Only NT secretion was increased upon luminal administration of 100 mM sodium oleate. Short chain fatty acids (20 mM) evoked an early and transient release of the three peptides. In contrast, taurocholate (20 mM) induced a sustained release of PYY, GLP-1, and NT, but the threshold concentration for peptide release was lower for NT than for PYY or GLP-1. Cellulose or pectin (0.5%, wt/vol) did not modify peptide secretion. In conclusion, glucose and peptone are potent stimulants of PYY, GLP-1, and NT release. Only NT is released upon oleic acid stimulation. Finally, taurocholate is a potent stimulant of the release of the three peptides. Overall, PYY, GLP-1, and NT may participate cooperatively in the ileal brake. As relatively high concentrations of the various stimulants were required to elicit peptide release, it seems likely that this mechanism operates in cases of maldigestion or malabsorption.




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