Duodeno-jejunal bypass restores β-cell hypersecretion and islet hypertrophy in western diet obese rats

Mariana Carla Mendes, Maria Lúcia Bonfleur, Rosane Aparecida Ribeiro, Camila Lubaczeuski, Ana Flavia Justino Fêo, Rodrigo Vargas, Everardo Magalhães Carneiro, Antonio Carlos Boschero, Allan Cezar Faria Araujo, Sandra Lucinei Balbo

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Purpose: Duodeno-jejunal bypass (DJB) operation improves glucose homeostasis in morbid obesity, independently of weight loss or reductions in adiposity, through mechanisms not yet fully elucidated. Herein, we evaluated the effects of DJB upon glucose homeostasis, endocrine pancreatic morphology, and β-cell responsiveness to potentiating agents of cholinergic and cAMP pathways, in western diet (WD) obese rats, at 2 months after operation. Methods: From 8 to 18 weeks of age male Wistar rats fed on a WD. After this period, a sham (WD Sham group) or DJB (WD DJB) operations were performed. At 2 months after operation glucose homeostasis was verified. Results: Body weight was similar between WD DJB and WD Sham rats, but WD DJB rats showed a decrease in Lee index, retroperitoneal and perigonadal fat pads. Also, WD DJB rats displayed reduced fasting glycemia and insulinemia, and increased insulin-induced Akt activation in the gastrocnemius. Islets from WD DJB rats secreted less amounts of insulin, in response to activators of the cholinergic (carbachol and phorbol 12-myristate 13-acetate) and cAMP (forskolin and 3-isobutyl-1-methyl-xantine) pathways. Islets of WD DJB rats had higher sintaxin-1 protein content than WD Sham, but without modification in muscarinic-3 receptor, protein kinase (PK)-Cα, and (PK)-Aα protein amounts. In addition, islets of WD DJB animals showed reduction in islets and β-cell masses. Conclusion: DJB surgery improves fasting glycemia and insulin action in skeletal muscle. Better endocrine pancreatic morphofunction was associated, at least in part, with the regulation of the cholinergic and cAMP pathways, and improvements in syntaxin-1 islet protein content induced by DJB.

Original languageEnglish (US)
Pages (from-to)407-414
Number of pages8
JournalEndocrine
Volume60
Issue number3
DOIs
StatePublished - Jun 1 2018
Externally publishedYes

Keywords

  • Bariatric surgery
  • Cafeteria diet
  • Insulin secretion
  • Obesity
  • Pancreatic islet morphometry

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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