Preparation of cardiomyopathy model in rats with type 2 diabetes

Lijuan DENG; Shenren CHEN; Lizhen LIU

ABSTRACT

BACKGROUND:

Diabetic cardiomyopathy is closely related to the high incident rate of diabetic heart failure. It is extremely significant to set up the successful dietetic cardiomyopathy model for the study on improving cardiac function.

OBJECTIVE:

To understand the influence of high blood sugar on myocardium by setting up the model of type 2 diabetes and diabetic cardiomyopathy.

DESIGN:

Completely randomized design, randomized and controlled study,in which, the experimental animals were taken as the objects.

SETTING:

Department of endocrinology of a university.

METHODS:

In the experiment, 99 newly born Wistar male rats were employed, randomized into experiment group (75 rats) and the control group(24 rats). In the control group, abdominal injection was done with sodium citrate buffer and the single abdominal injection was done with strptozocin(STZ)90 mg/kg in the experiment group. Ten weeks later, the glucose tolerance was assayed to determine the set-up of diabetes model. The ultrastructure of myocardium of rats was tested under electronic microscope after being sacrificed.MAIN OUTCOME

MEASURES:

To observer whether the myofibrillae and mitochondria of myocardiocytes alter or not in diabetic rats.

RESULTS:

In the experiment group, the fasting blood sugar[(8.87± 0.76)mmol/L] was slightly higher than that[ (5.88 ± 0. 45)mmol/L] in the control group, the blood sugar 2 hours after meal was remarkably higher than that in the control group and the glucose tolerance was abnormal. Under the electronic microscope, the myofibrillae presented focal degeneration and disarranged order of myofilament; mitochondria of myocardiocytes presented swelling and focal proliferation.

CONCLUSION:

This model is the satisfactory carrier for the study on diabetes Ⅱ and its myocardiopathy, which lays an experimental foundation for the study on cardiac function of type 2 diabetes.