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Gpr17 in AgRP Neurons Regulates Feeding and Sensitivity to Insulin and Leptin

Authors :
Domenico Accili
Ning Kon
Hongxia Ren
Joshua R. Cook
Source :
Diabetes
Publication Year :
2015
Publisher :
American Diabetes Association, 2015.

Abstract

Hypothalamic neurons expressing agouti-related peptide (AgRP) regulate eating and glucose metabolism. Ablation of FOXO1 in AgRP neurons of mice results in reduced food intake, leanness, improved glucose homeostasis, and increased sensitivity to insulin and leptin. We tentatively identified G-protein–coupled receptor Gpr17 as an effector of FOXO1 orexigenic signals in AgRP neurons. In this study, we generated and characterized AgRP neuron–specific Gpr17 knockout mice (Agrp-Gpr17−/−) to test the hypothesis that Gpr17 regulates appetite, energy expenditure, and metabolism. Agrp-Gpr17−/− mice show reduced food intake, increased relative energy expenditure, and increased satiety, resulting in leanness and reduced body fat. They also show increased central nervous system sensitivity to insulin and leptin and reduced plasma glucose excursions following the administration of glucose or pyruvate. In summary, AgRP neuron–specific Gpr17 knockouts phenocopy FOXO1 knockouts in the same cell type, thus supporting our original hypothesis and providing further impetus to develop Gpr17 antagonists for the treatment of obesity.

Details

ISSN :
1939327X and 00121797
Volume :
64
Database :
OpenAIRE
Journal :
Diabetes
Accession number :
edsair.doi.dedup.....15bd472025ea47f7700b5b5a23df4951
Full Text :
https://doi.org/10.2337/db15-0390