The Roux-en-Y gastric bypass (RYGBP) and the biliopancreatic diversion (BPD) induce long-term control of type 2 diabetes in morbidly obese individuals. The reasons for such an effect on glycemic metabolism are thought to be secondary to reduced food intake, weight loss and modifications of the enteroinsular axis which is impaired in type 2 diabetic p a t i e n t s . Both GLP-1 and GIP have an impaired secretin effect in type 2 diabetics, and surgery can restore this function. GIP is a peptide secreted by the duodenal K-cells in response to ingested fat and carbohydrate. In obese type 2 diabetes patients, its receptor on b-cells is down-regulated. GLP-1 is a peptide secreted by the gut L-cells, and, in type 2 diabetes, its secretion is impaired.Both RYGBP and BPD provide durable GLP-1 delivery, both during fasting and after meal ingestion, inducing L-cell stimulation by early arrival of nutrients in the distal ileum. The secretion of GLP-1 influences glucose metabolism by inhibiting glucagon secretion, s t i mulating insulin secretion, delaying gastric emptying and stimulating glycogenogenesis.In conclusion,the early arrival of a meal in the terminal ileum seems to be the common feature of both operations that leads to an improvement in glycemic metabolism and to resolution of type 2 diabetes.
The enteroinsular axis and the recovery of type 2 diabetes after bariatric surgery
PATRITI, Alberto;FACCHIANO, ENRICO;GULLA', Nino;DONINI, Annibale
2004
Abstract
The Roux-en-Y gastric bypass (RYGBP) and the biliopancreatic diversion (BPD) induce long-term control of type 2 diabetes in morbidly obese individuals. The reasons for such an effect on glycemic metabolism are thought to be secondary to reduced food intake, weight loss and modifications of the enteroinsular axis which is impaired in type 2 diabetic p a t i e n t s . Both GLP-1 and GIP have an impaired secretin effect in type 2 diabetics, and surgery can restore this function. GIP is a peptide secreted by the duodenal K-cells in response to ingested fat and carbohydrate. In obese type 2 diabetes patients, its receptor on b-cells is down-regulated. GLP-1 is a peptide secreted by the gut L-cells, and, in type 2 diabetes, its secretion is impaired.Both RYGBP and BPD provide durable GLP-1 delivery, both during fasting and after meal ingestion, inducing L-cell stimulation by early arrival of nutrients in the distal ileum. The secretion of GLP-1 influences glucose metabolism by inhibiting glucagon secretion, s t i mulating insulin secretion, delaying gastric emptying and stimulating glycogenogenesis.In conclusion,the early arrival of a meal in the terminal ileum seems to be the common feature of both operations that leads to an improvement in glycemic metabolism and to resolution of type 2 diabetes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
