Glucagon regulates hepatic kisspeptin to impair insulin secretion Academic Article uri icon

Overview

MeSH Major

  • Gene Expression Regulation
  • Glucagon
  • Gluconeogenesis
  • Insulin
  • Kisspeptins
  • Liver

abstract

  • Early in the pathogenesis of type 2 diabetes mellitus (T2DM), dysregulated glucagon secretion from pancreatic α cells occurs prior to impaired glucose-stimulated insulin secretion (GSIS) from β cells. However, whether hyperglucagonemia is causally linked to β cell dysfunction remains unclear. Here we show that glucagon stimulates via cAMP-PKA-CREB signaling hepatic production of the neuropeptide kisspeptin1, which acts on β cells to suppress GSIS. Synthetic kisspeptin suppresses GSIS in vivo in mice and from isolated islets in a kisspeptin1 receptor-dependent manner. Kisspeptin1 is increased in livers and in serum from humans with T2DM and from mouse models of diabetes mellitus. Importantly, liver Kiss1 knockdown in hyperglucagonemic, glucose-intolerant, high-fat-diet fed, and Lepr(db/db) mice augments GSIS and improves glucose tolerance. These observations indicate a hormonal circuit between the liver and the endocrine pancreas in glycemia regulation and suggest in T2DM a sequential link between hyperglucagonemia via hepatic kisspeptin1 to impaired insulin secretion.

publication date

  • April 2014

Research

keywords

  • Academic Article

Identity

Language

  • eng

PubMed Central ID

  • PMC4058888

Digital Object Identifier (DOI)

  • 10.1016/j.cmet.2014.03.005

PubMed ID

  • 24703698

Additional Document Info

start page

  • 667

end page

  • 81

volume

  • 19

number

  • 4