Related Experiment Video
Updated: Sep 8, 2025

Roux-en-Y Gastric Bypass Operation in Rats
Published on: June 11, 2012
β-Cell Function and Sensitivity to Incretins Before and After Roux-en-Y Gastric Bypass in Individuals With Type 2
Maria S Svane1,2,3, Morten Hindsø1, Christoffer Martinussen1
1Department of Endocrinology, Hvidovre Hospital, Copenhagen University, Hvidovre, Denmark.
Article Highlights:
Roux-en-Y gastric bypass improves glycemic control in patients with type 2 diabetes, but the impact of the improved glycemic control on β-cell sensitivity to glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic peptide (GIP) is sparsely described. GLP-1 and GIP potentiated insulin secretion during clamped hyperglycemia before and after surgery, but, when related to the response to glucose alone, the relative potentiating effects of GIP (on first-phase insulin secretion) and GLP-1 (on first- and second-phase insulin secretion) were reduced postoperatively. The improvement in β-cell function after Roux-en-Y gastric bypass in patients with type 2 diabetes is not driven by improved β-cell sensitivity to incretins but rather other factors, including improved β-cell sensitivity to the changed glucose response and exaggerated postprandial GLP-1.
Related Concept Videos
Glucagon-like Receptor Agonists
GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by...
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
Insulin and C-peptide are...
Diabetes Mellitus: Type 2 and Gestational
Hormones Regulating Blood Glucose
In addition to accelerating glucose uptake and utilization, insulin has...
Oral Hypoglycemic Agents: Biguanides and Glitazones
Carbohydrate Metabolism
Starch accounts for approximately 60% of the carbohydrates consumed by humans. Since amylase enzymes cannot function in the stomach's acidic environment, starch can only be digested in the mouth and small intestine. Simple sugars are found naturally in milk and fruits in...

