PYY-Dependent Restoration of Impaired Insulin and Glucagon Secretion in Type 2 Diabetes following Roux-En-Y Gastric Bypass Surgery

Cell Rep. 2016 May 3;15(5):944-950. doi: 10.1016/j.celrep.2016.03.091. Epub 2016 Apr 21.

Abstract

Roux-en-Y gastric bypass (RYGB) is a weight-reduction procedure resulting in rapid resolution of type 2 diabetes (T2D). The role of pancreatic islet function in this restoration of normoglycemia has not been fully elucidated. Using the diabetic Goto-Kakizaki (GK) rat model, we demonstrate that RYGB restores normal glucose regulation of glucagon and insulin secretion and normalizes islet morphology. Culture of isolated islets with serum from RYGB animals mimicked these effects, implicating a humoral factor. These latter effects were reversed following neutralization of the gut hormone peptide tyrosine tyrosine (PYY) but persisted in the presence of a glucagon-like peptide-1 (GLP-1) receptor antagonist. The effects of RYGB on secretion were replicated by chronic exposure of diabetic rat islets to PYY in vitro. These findings indicate that the mechanism underlying T2D remission may be mediated by PYY and suggest that drugs promoting PYY release or action may restore pancreatic islet function in T2D.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Animals
  • Diabetes Mellitus, Type 2 / metabolism*
  • Gastric Bypass*
  • Glucagon / metabolism*
  • Glucagon-Like Peptide 1 / metabolism
  • Humans
  • Insulin / metabolism*
  • Insulin Secretion
  • Islets of Langerhans / metabolism
  • Islets of Langerhans / pathology
  • Male
  • Peptide YY / metabolism*
  • Rats, Wistar
  • Transcription, Genetic

Substances

  • Insulin
  • Peptide YY
  • Glucagon-Like Peptide 1
  • Glucagon