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Neuropeptide Y impairs insulin-stimulated translocation of glucose transporter 4 in 3T3-L1 adipocytes through the Y1 receptor.

Abstract：

:Neuropeptide Y (NPY) is expressed in adipose tissue and is involved in adipocyte metabolism. Although NPY impacts on glucose utilization in vivo, the underlying cellular mechanism is yet to be fully elucidated. In this study we investigated the effect of NPY on the insulin-stimulated translocation of glucose transporter 4 (GLUT4) from intracellular stores to the cell surface in vitro. Using cellular fractionation and immunofluorescence we analyzed the cellular localization and content of GLUT4 in 3T3-L1 adipocytes. Additionally we investigated the effect of NPY on insulin action in adipocyte cultures by assessing the phosphorylation of Akt and [(3)H]-deoxyglucose uptake. Our data suggest that in 3T3-L1 adipocytes NPY inhibits insulin-stimulated glucose uptake in a GLUT4-dependent manner. The insulin induced translocation of GLUT4 was attenuated by the Y1 receptor agonist [Phe(7),Pro(34)] pNPY, demonstrating an essential role of the Y1 receptor in GLUT4 translocation. Additionally, we observed an NPY dose-dependent impairment of Akt phosphorylation. This study provides evidence that NPY impairs the insulin sensitivity of adipocytes and suggests that the Y1 receptor could be a potential therapeutic target for type 2 diabetes.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Gericke MT,Schröder T,Kosacka J,Nowicki M,Klöting N,Spanel-Borowski K

doi

10.1016/j.mce.2011.07.028

subject

Has Abstract

pub_date

2012-01-02 00:00:00

pages

27-32

issue

1

eissn

0303-7207

issn

1872-8057

pii

S0303-7207(11)00408-4

journal_volume

348

pub_type

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