Horm Metab Res 2004; 36(2): 119-125
DOI: 10.1055/s-2004-814223
Original Clinical
© Georg Thieme Verlag Stuttgart · New York

Cinnamon Extract Prevents the Insulin Resistance Induced by a High-fructose Diet

B.  Qin 1 , M.  Nagasaki 2 , M.  Ren 3 , G.  Bajotto 1 , Y.  Oshida 1, 2 , Y.  Sato 1, 2
  • 1Department of Sports Medicine, Graduate School of Medicine, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
  • 2Research Center of Health, Physical Fitness and Sports, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
  • 3Department of Visual Neuroscience, Graduate School of Medicine, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Further Information

Publication History

Received 16 June 2003

Accepted after revision 18 August 2003

Publication Date:
05 March 2004 (online)

Abstract

The aim of this study was to determine whether cinnamon extract (CE) would improve the glucose utilization in normal male Wistar rats fed a high-fructose diet (HFD) for three weeks with or without CE added to the drinking water (300 mg/kg/day). In vivo glucose utilization was measured by the euglycemic clamp technique. Further analyses on the possible changes in insulin signaling occurring in skeletal muscle were performed afterwards by Western blotting. At 3 mU/kg/min insulin infusions, the decreased glucose infusion rate (GIR) in HFD-fed rats (60 % of controls, p < 0.01) was improved by CE administration to the same level of controls (normal chow diet) and the improving effect of CE on the GIR of HFD-fed rats was blocked by approximately 50 % by N-monometyl-L-arginine. The same tendency was found during the 30 mU/kg/min insulin infusions. There were no differences in skeletal muscle insulin receptor (IR)-β, IR substrate (IRS)-1, or phosphatidylinositol (PI) 3-kinase protein content in any groups. However, the muscular insulin-stimulated IR-β and IRS-1 tyrosine phosphorylation levels and IRS-1 associated with PI 3-kinase in HFD-fed rats were only 70 ± 9 %, 76 ± 5 %, and 72 ± 6 % of controls (p < 0.05), respectively, and these decreases were significantly improved by CE treatment. These results suggest that early CE administration to HFD-fed rats would prevent the development of insulin resistance at least in part by enhancing insulin signaling and possibly via the NO pathway in skeletal muscle.

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Y. Sato,M. D., Ph. D. 

Research Center of Health · Physical Fitness and Sports · Nagoya University

Furo-cho · Chikusa-ku · Nagoya 464-8601 · Japan

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Email: ysato@med.nagoya-u.ac.jp