Horm Metab Res 2008; 40(8): 528-532
DOI: 10.1055/s-2008-1073162
Original Basic

© Georg Thieme Verlag KG Stuttgart · New York

A High-fructose Diet Impairs Akt and PKCζ Phosphorylation and GLUT4 Translocation in Rat Skeletal Muscle

P. Li 1 , T. Koike 1 , 2 , B. Qin 1 , M. Kubota 1 , Y. Kawata 1 , Y. J. Jia 1 , Y. Oshida 1 , 2
  • 1Department of Sports Medicine, Graduate School of Medicine, Nagoya University, Nagoya, Japan
  • 2Research Center of Health, Physical Fitness and Sports, Nagoya University, Nagoya, Japan
Further Information

Publication History

received 16.05.2007

accepted 15.01.2008

Publication Date:
21 May 2008 (online)

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Abstract

The molecular mechanism of insulin resistance induced by high-fructose feeding is not fully understood. The present study investigated the role of downstream signaling molecules of phosphatidylinositol 3-kinase (PI3K) in the insulin-stimulated skeletal muscle of high-fructose-fed rats. Rats were divided into chow-fed and fructose-fed groups. The results of the euglycemic clamp study (insulin infusion rates: 6 mU/kg BW/min) showed a significant decrease in the glucose infusion rate (GIR) and the metabolic clearance rate of glucose (MCR) in fructose-fed rats compared with chow-fed rats. In skeletal muscle removed immediately after the clamp procedure, high-fructose feeding did not alter protein levels of protein kinase B (PKB/Akt), protein kinase C ζ (PKCζ), or glucose transporter 4 (GLUT4). However, insulin-stimulated phosphorylation of Akt and PKCζ and GLUT4 translocation to the plasma membrane were reduced. Our findings suggest that insulin resistance in fructose-fed rats is associated with impaired Akt and PKCζ activation and GLUT4 translocation in skeletal muscle.

References

Correspondence

Y. OshidaMD, PhD 

Department of Sports Medicine

Graduate School of Medicine

Nagoya University

464-8601 Nagoya

Japan

Phone: +81/52/789 39 61

Fax: +81/52/789 39 57

Email: oshida@htc.nagoya-u.ac.jp