Duodenal-jejunal bypass significantly improved oral glucose tolerance in diabetic rats compared with controls (P<0.001), demonstrating that bypassing the proximal intestine ameliorates type 2 diabetes.
Does bypassing the proximal intestine improve glucose tolerance in type 2 diabetic rats?
Bypassing a short segment of proximal intestine directly ameliorates type 2 diabetes independently of weight loss or malabsorption, suggesting a role of the proximal bowel in T2D pathophysiology.
p-value: p=<0.001
SUMMARY BACKGROUND DATA: Most patients who undergo Roux-en-Y gastric bypass (RYGB) experience rapid resolution of type 2 diabetes. Prior studies indicate that this results from more than gastric restriction and weight loss, implicating the rearranged intestine as a primary mediator. It is unclear, however, if diabetes improves because of enhanced delivery of nutrients to the distal intestine and increased secretion of hindgut signals that improve glucose homeostasis, or because of altered signals from the excluded segment of proximal intestine. We sought to distinguish between these two mechanisms. METHODS: Goto-Kakizaki (GK) type 2 diabetic rats underwent duodenal-jejunal bypass (DJB), a stomach-preserving RYGB that excludes the proximal intestine, or a gastrojejunostomy (GJ), which creates a shortcut for ingested nutrients without bypassing any intestine. Controls were pair-fed (PF) sham-operated and untreated GK rats. Rats that had undergone GJ were then reoperated to exclude the proximal intestine; and conversely, duodenal passage was restored in rats that had undergone DJB. Oral glucose tolerance (OGTT), food intake, body weight, and intestinal nutrient absorption were measured. RESULTS: There were no differences in food intake, body weight, or nutrient absorption among surgical groups. DJB-treated rats had markedly better oral glucose tolerance compared with all control groups as shown by lower peak and area-under-the-curve glucose values (P < 0.001 for both). GJ did not affect glucose homeostasis, but exclusion of duodenal nutrient passage in reoperated GJ rats significantly improved glucose tolerance. Conversely, restoration of duodenal passage in DJB rats reestablished impaired glucose tolerance. CONCLUSIONS: This study shows that bypassing a short segment of proximal intestine directly ameliorates type 2 diabetes, independently of effects on food intake, body weight, malabsorption, or nutrient delivery to the hindgut. These findings suggest that a proximal intestinal bypass could be considered for diabetes treatment and that potentially undiscovered factors from the proximal bowel might contribute to the pathophysiology of type 2 diabetes.
Rubino et al. (Fri,) conducted a other in Type 2 diabetes. Duodenal-jejunal bypass (DJB) vs. Gastrojejunostomy (GJ), pair-fed sham-operated, and untreated controls was evaluated on Oral glucose tolerance (peak and area-under-the-curve glucose values) (p=<0.001). Duodenal-jejunal bypass significantly improved oral glucose tolerance in diabetic rats compared with controls (P<0.001), demonstrating that bypassing the proximal intestine ameliorates type 2 diabetes.