ABSTRACT
Objective To observe the biological characteristics of db/db mice, and to provide the basis for application of db/db mice in experimental research.Methods Spontaneous type 2 diabetes BKS.Cg-Dock7m +/+ Leprdb/JNju mice and wild type mice of the same age were used in this study.Their fasting blood glucose was determined at 8,12,16, 20 and 24 weeks of age, the body weight was recorded at 10, 12,16, 20 and 24 weeks of age, the levels of serum insulin, total cholesterol and triglyceride were measured, the organ weight and liver coefficient were determined, and the liver and pancreas were taken for pathological examination at 24 weeks of age.Results The db/db mice maintained a high level of fasting blood glucose and body weight.Levels of serum insulin, total cholesterol, and triglyceride were significantly higher than the wild type mice.Compared with wild type mice, liver weight and kidney weight were also significantly increased.Obvious pathological changes of liver and pancreas were observed in 24-week old db/db mice.Conclusions db/db mouse has obvious characteristics of type 2 diabetes, such as hyperglycemia, hyperlipidemia, and hyperinsulinemia, can maintain stable levels of high blood glucose,and is an ideal animal model for experimental study of type 2 diabetes mellitus.
ABSTRACT
Aim To establish phlegm and blood stasis, qi-stag-nation and blood stasis, phlegm turbid+qi-stagnation and blood stasis model in rats and to study the characteristics of animal models with different blood stasis. Methods SD rats were ran-domly divided into normal group, high fat diet group, chronic unpredictable mild stress group ( CUMS ) and high fat diet +chronic unpredictable mild stress group. Different states of blood stasis rat models were established by corresponding factors for 6 weeks. Indexes of weight, open field behavior, serum lipids and corticosterone were monitored dynamically at the 2 nd, 4 th, 6 th weeks. At the end of the experiment(6th week), the heart func-tion was detected by small animal ultrasound and the left ventric-ular intubation. The blood rheology indexes were detected by the viscosity tester and red blood cell deformation/aggregation test instrument. Results Compared with the normal group, blood stasis could be induced by high fat diet and chronic unpredicta-ble mild stress, introducing the influence of different degree on animal behavior, blood lipids, heart function and blood viscosi-ty. When the two factors were superimposed, the changes of the indexes about blood stasis were the most significant. Perform-ance as: compared with normal control group, a significant re-duction was observed in body weight ( P < 0. 01 ); horizontal movement, vertical movement and movement time were reduced (P<0. 01 or P<0. 05) at the 2 nd week;at the 2 nd and 4 th week, serum corticosterone was increased ( P <0. 01 or P <0. 05) as well as TG at the 4 th and 6 th week (P<0. 01); at the 6 th week, velocity of blood was slowed down ( P<0. 01 );left ventricular anterior wall and posterior wall thickness at end-systolic was increased ( P<0. 01 or P<0. 05 ); left ventricular diastolic index was increased ( P<0. 01 ); the maximum rate of myocardial contraction was decreased ( P < 0. 05 ); the whole blood viscosity was increased ( P<0. 01 ) . Conclusions Blood stasis could be formed by high fat diet and chronic unpredictable mild stress, which has different characteristics. When the two factors are superimposed, the abnormal behavior, blood viscosi-ty, heart function, blood lipid and other indexes of the animal could obviously appear, which can provide the basis for the stud-y of blood stasis syndrome and related drugs.