Enhancement of dietary peptide-induced GLP-1 secretion by indigestible saccharides

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GLP-1 is one of gastrointestinal hormones, and it has potent anti-obese and anti-diabetic effects. In the present project, we investigated whether indigestible peptides or indigestible saccharides are effective to increase GLP-1 secretion in a cell culture model and animal models. We also examined combined effects of indigestible saccharides and a dietary peptide.We demonstrated that oral administration of a dietary peptide (corn peptide) potently stimulated GLP-1 secretion and it resulted in reduced glycemic response in normal and diabetic rats.Luminal and oral administration of an indigestible saccharide (resistant maltodextrin, RMD) stimulated GLP-1 secretion in rats, and continuous ingestion of RMD also enhanced basal GLP-1 secretion. Furthermore, rats continuously having RMD showed increased GLP-1 secretory response to oral administration the corn peptide. These results revealed potential and combined effects of indigestible saccharides and dietary peptides in vivo.