Nobiletin improves hyperglycemia and insulin resistance in obese diabetic ob/ob mice.

Abstract:

:Nobiletin is a polymethoxylated flavone found in certain citrus fruits that exhibits various pharmacological effects including anti-inflammatory, antitumor and neuroprotective properties. The present study investigated the effects of nobiletin on insulin sensitivity in obese diabetic ob/ob mice, and the possible mechanisms involved. The ob/ob mice were treated with nobiletin (200mg/kg) for 5 weeks. Nobiletin significantly improved the plasma glucose levels, homeostasis model assessment index, glucose tolerance in an oral glucose tolerance test and plasma adiponectin levels. In white adipose tissue (WAT), nobiletin significantly decreased the mRNA expression levels of inflammatory adipokines such as interleukin (IL)-6 and monocyte chemoattractant protein (MCP)-1 and increased the mRNA expression levels of adiponectin, peroxisome proliferator-activated receptor (PPAR)-gamma and its target genes. At the same time, nobiletin increased the glucose transporter (Glut) 4 expression levels in the whole plasma membrane, and Glut1 and phospho-Akt expression in the whole cell lysates in WAT and muscle. Nobiletin also increased Glut4 protein expression level in the whole cell lysates of the muscle. Taken together, the present results suggest that nobiletin improved the hyperglycemia and insulin resistance in obese diabetic ob/ob mice by regulating expression of Glut1 and Glut4 in WAT and muscle, and expression of adipokines in WAT.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Lee YS,Cha BY,Saito K,Yamakawa H,Choi SS,Yamaguchi K,Yonezawa T,Teruya T,Nagai K,Woo JT

doi

10.1016/j.bcp.2010.01.034

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

1674-83

issue

11

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(10)00093-6

journal_volume

79

pub_type

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