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Yeungnam Univ J Med > Volume 24(2 Suppl); 2007 > Article
Yeungnam University Journal of Medicine 2007;24(2 Suppl):S481-492.
DOI: https://doi.org/10.12701/yujm.2007.24.2S.S481    Published online December 31, 2007.
Effect of Paraxanthine on Body Fat Reduction and Insulin Sensitivity in Monosodiun Glutamate-Obese Rats
Jae-Kyung Song1, So-Young Park1, Jong-Yeon Kim1, Hee-Sun Kim2, Yong-Woon Kim1
1Department of Physiology College of Medicine, Yeungnam University, Daegu, Korea
2Department of Microbiology College of Medicine, Yeungnam University, Daegu, Korea
Monosodiun Glutamate-비만 흰쥐에서 Paraxanthine이 체지방과 인슐린 감수성에 미치는 영향
송재경1, 박소영1, 김종연1, 김희선2, 김용운1
1영남대학교 의과대학 생리학교실
2영남대학교 의과대학 미생물학교실
Correspondence:  Yong-Woon Kim, Tel: (053) 620-4333, Fax: (053) 651-3651, 
Email: ywkim@med.yu.ac.kr
Abstract
Purpose:To evaluate the effects of body fat reduction on insulin sensitivity, it was measured the glucose disappearance rate, glucose infusion rate, and hepatic glucose production rate after paraxanthine (1,7-dimethylxanthine, metabolite of caffeine) treatment in monosodium -L-glutamate (MSG)-obese rats. Materials and Methods:Obesity was induced by neonatal (2, 4, 6, 8, 10 days) injection of MSG(4 g/kg, subcutaneously) for 15 weeks. MSG-obese rats showed severe fat deposition in subcutaneous and intraabdominal cavity, shortened body length, normoglycemia, hyperinsulinemia, and high FFA level. Insulin sensitivity was assessed with hyperinsulinemic euglycemic clamp technique under anesthesia with pentothal sodium. Plasma insulin concentration was clamped at 100 μU/ml by continuous insulin infusion (1.5 mU/kg/min). At steady state, the glucose disappearance rate and glucose infusion rate were decreased and the hepatic glucose production rate was increased in the MSG-obese rats compared to the normal rats.
Results
:At 15 weeks of age, paraxanthine (15 mg/kg) was administered with ephedrine (60 mg/kg) via per oral for 15 consecutive days. Body fat mass of the paraxanthine treated rats was decreased about 29.6% in the MSG-obese and 6.3% in the normal rats compared with the control rats during 15 days. In the paraxanthine treated MSG-obese rats, the fasting insulin level was significantly (p<0.05) decreased and the glucose infusion rate was significantly (p<0.05) increased compared to that of the MSG-control rats, however the glucose disappearance rate showed increasing tendency and the hepatic glucose production rate showed decreasing tendency compared to that of the MSG-control rats. Conclusion:These results suggest that paraxanthine exerts an anti-obesity effect and improve insulin sensitivity in rats with MSG-induced obesity.
Key Words: MSG-obese rats, Paraxanthine, Insulin sensitivity
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