Obesity Surgery

, Volume 19, Issue 2, pp 202–206

Glucose Tolerance in the Proximal Versus the Distal Small Bowel in Wistar Rats

  • Marcus Vinicius Dantas de Campos Martins
  • Antônio Augusto Peixoto
  • Alberto Schanaider
  • Christiano Costa Esposito
  • Carolina Barreira Albano Aratanha
Research Article

Abstract

Background

Type 2 diabetes is an epidemic and insulin resistance is the central etiology of this disease. Obesity increases insulin resistance and glucose intolerance and also exacerbates metabolic abnormalities present in type 2 diabetes. Bariatric surgery is the most effective treatment for severe obesity. Most reported series show that return to euglycemia and normal insulin levels occur days after gastric bypass and biliopancreatic diversion, long before major weight loss has taken place. The mechanisms underlying this dramatic reversal of type 2 diabetes following these bariatric procedures are not well understood.

Methods

Twelve Wistar rats were fed with a palatable hyperlipidic diet for 12 weeks. Body weight, glucose, and intraperitoneal glucose tolerance test were measured regularly. On day 91, they were randomized in two groups (hindgut and controls) and operated. Twenty-one days later, the tests were done again and the hindgut group re-operated. A duodenal exclusion was done. The results of an intraperitoneal glucose tolerance test were compared after the procedures.

Results

Body weight increased regularly in all the rats. Some rats developed hyperglycemia 28 days after beginning hyperlipidic diet, but these levels returned to baseline on days 56 and 84. The glucose tolerance test showed an improvement in glycemic levels in the hindgut group 21 days after the first operation (151 ± 21mg/dl). After the second operation, despite weight loss, the glucose tolerance test of the foregut group worsened again (267 ± 53 mg/dl) (p < 0.01).

Conclusion

Comparing the “hindgut hypothesis” and the “foregut hypothesis”, our data show an improvement in the 30 min glucose tolerance test in the hindgut group.

Keywords

Diabetes mellitus Rats, Wistar Glucose intolerance Intestine, small 

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Copyright information

© Springer Science + Business Media, LLC 2008

Authors and Affiliations

  • Marcus Vinicius Dantas de Campos Martins
    • 1
    • 2
    • 5
  • Antônio Augusto Peixoto
    • 1
  • Alberto Schanaider
    • 3
  • Christiano Costa Esposito
    • 1
  • Carolina Barreira Albano Aratanha
    • 4
  1. 1.Department of Surgery, Faculty of MedicineFederal University of Rio de JaneiroRio de JaneiroBrazil
  2. 2.Estácio de Sá UniversityRio de JaneiroBrazil
  3. 3.Experimental Surgical Center of the Department of Surgery, Faculty of MedicineFederal University of Rio de JaneiroRio de JaneiroBrazil
  4. 4.Faculty of MedicineFederal University of Rio de JaneiroRio de JaneiroBrazil
  5. 5.Barra da Tijuca–Rio de JaneiroBrazil

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