Back to Search Start Over

Hypothalamic prolyl endopeptidase (PREP) regulates pancreatic insulin and glucagon secretion in mice

Authors :
Jin Kwon Jeong
Jung Dae Kim
Mari Savolainen
Ralph J. DiLeone
Giuseppe D'Agostino
John D. Elsworth
Caroline J. Zeiss
Sabrina Diano
Timo T. Myöhänen
Owen Chan
Richard G. Kibbey
Chitoku Toda
Brandon K. Harvey
Christopher T. Richie
Kim, Jung Dae
Toda, Chitoku
D'Agostino, Giuseppe
Zeiss, Caroline J
Dileone, Ralph J
Elsworth, John D
Kibbey, Richard G
Chan, Owen
Harvey, Brandon K
Richie, Christopher T
Savolainen, Mari
Myöhänen, Timo
Jeong, Jin Kwon
Diano, Sabrina
Source :
Proceedings of the National Academy of Sciences of the United States of America. 111(32)
Publication Year :
2014

Abstract

Prolyl endopeptidase (PREP) has been implicated in neuronal functions. Here we report that hypothalamic PREP is predominantly expressed in the ventromedial nucleus (VMH), where it regulates glucose-induced neuronal activation. PREP knockdown mice (Prep(gt/gt)) exhibited glucose intolerance, decreased fasting insulin, increased fasting glucagon levels, and reduced glucose-induced insulin secretion compared with wild-type controls. Consistent with this, central infusion of a specific PREP inhibitor, S17092, impaired glucose tolerance and decreased insulin levels in wild-type mice. Arguing further for a central mode of action of PREP, isolated pancreatic islets showed no difference in glucose-induced insulin release between Prep(gt/gt) and wild-type mice. Furthermore, hyperinsulinemic euglycemic clamp studies showed no difference between Prep(gt/gt) and wild-type control mice. Central PREP regulation of insulin and glucagon secretion appears to be mediated by the autonomic nervous system because Prep(gt/gt) mice have elevated sympathetic outflow and norepinephrine levels in the pancreas, and propranolol treatment reversed glucose intolerance in these mice. Finally, re-expression of PREP by bilateral VMH injection of adeno-associated virus-PREP reversed the glucose-intolerant phenotype of the Prep(gt/gt) mice. Taken together, our results unmask a previously unknown player in central regulation of glucose metabolism and pancreatic function.

Details

ISSN :
10916490
Volume :
111
Issue :
32
Database :
OpenAIRE
Journal :
Proceedings of the National Academy of Sciences of the United States of America
Accession number :
edsair.doi.dedup.....dca230d6baf4cbc666613ebb4c19cdf7