Untersuchungen zur Bedeutung des distalen Kolons für die Funktionsfähigkeit der enteroinsulären Achse

This study addresses the question whether the insulinotropic gut hormone, glucagon-like peptide-1 (GLP-1), is released from the lower large bowel upon oral or rectal glucose uptake. Methods: It was evaluated whether rectum or sigmoid colon resection alters glucose homeostasis or the plasma levels of the insulinotropic gut hormone, gastric inhibitory polypeptide (GIP), or GLP-1. eight men and 3 women (age 63 ± 8 years, BMI 25.4 ± 4.0 kg/m2) with normal preoperative fasting glucose values were treated before and after resection of large bowel segments. Fasting oral glucose tolerance (OGT, 75 g glucose/300 ml) tests were performed both before and 10 days postoperatively. Another approach aimed to clarify whether luminal glucose stimulation in the rectum/sigmoid colon increases GLP-1 plasma levels.