- Increased Plasma Dipeptidyl Peptidase IV Activities in ob/ob Mice.
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Sang Dal Rhee, Young Sil Lee, Hye Sung Lee, Won Hoon Jung, Hyae Gyeong Cheon, Jin Hee Ahn, Sung Su Kim, Sang Gi Paik, Sung Don Yang
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Korean Diabetes J. 2005;29(1):22-29. Published online January 1, 2005
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 Abstract
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- BACKGROUND
Dipeptidyl peptidase IV (DPP IV/CD26), a multi-functional glycoprotein, cleaves and inactivates major insulinotropic hormones, such as glucagon-like protein (GLP)-1 and glucose dependent insulinotrophic polypeptide (GIP). METHODS: The plasma DPP IV activities in ob/ob mice were measured at 4, 8 and 13 weeks of age and the correlation between the plasma glucose concentration and DPP IV activity analyzed at 7~9 weeks of age. The glucose lowering effects of P32/98, a DPP IV inhibitor, was assessed with the oral glucose tolerance test. RESULTS: The plasma DPP IV activities in ob/ob mice were higher than those in lean mice. The plasma DPP IV activity was correlated with the plasma glucose concentration both in male and female ob/ob mice. The glucose lowering effect of DPP IV inhibitor was more prominent in ob/ob than in lean mice. CONCLUSION: The plasma DPP IV activities in ob/ob mice were higher than in lean control mice, which may contribute to the higher glucose lowering effect of the DPP IV inhibitor in ob/ob mice
- Characteristics of the Newly Established Diabetic Model Mice, TallyHo.
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Sang Dal Rhee, Won Hun Jeong, Yoon Young Sung, Hye Sung Lee, Kun Bock Lee, Hee Yeon Kim, Sung Don Yang
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Korean Diabetes J. 2004;28(3):177-186. Published online June 1, 2004
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Abstract
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- BACKGROUND
TallyHo(TH) mice are a newly established model for non-insulin dependent diabetes mellitus(NIDDM), for polygenic causative genes that have not yet been identified. It has been reported that TH mice show mild obesity, hyperinsulinemia, hyperlipidemia and male-limited hyperglycemia. The characteristics of these mice were examined. METHODS: Diabetes related physiological data of TH mice, such as body weight, the plasma concentration of biochemical parameters(glucose, triglyceride and nonesterified free fatty acid) and changes in the pattern of the oral glucose tolerance test(OGTT), were obtained up to the age of 35 weeks. The insulin tolerance test(ITT) was performed at 7 weeks of age and the weights of the fat pad and liver were measured at 35 weeks of age. RESULTS: TH mice revealed hyperlipidemia, glucose intolerance and disturbed insulin tolerance, even when prediabetic at 7 weeks of age. Hyperglycemia and hyper- insuline-mia were observed as early as 10 weeks of age; however, individual variations in the blood glucose level were large at this age. Obesity in TH mice seems to be caused by the predominant deposition of visceral fat. CONCLUSION: These results suggest that TH mice are an appropriate rodent model for diabetes with visceral obesity and insulin resistance.
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KDA
