Establishment of blood glucose fluctuation diabetic rats model

Objective To establish the blood glucose fluctuation diabetic rat model by subcutaneous injecting insulin. Method The male Sprague-Dawley (SD) rats were randomly assigned into two groups, normal group ( n =20) and model group ( n =40). Normal group rats were fed with normal diet, model group rats were fed with a high-sucrose-high-fat diet. After 6 weeks, a low dose of streptozotocin ( STZ ,30mg/kg) was injected to induce hyperglycemia in model group rats. And then the model group rats were ran-dom divided into two subgroups, diabetic group ( n = 20) and blood glucose fluctuation group ( n = 20). Blood glucose fluctuation group rats were induced by subcutaneous injecting insulin twice daily. All rats were executed after intervening for 3 months, metabolic cages were used to collect 24-hour urine one week before all rats were executed. Results The average blood glucose levels (MBG), the standard deviation of daily aver-age blood glucose (SDBG) and the largest amplitude of glycemic excursions (LAGE) were significant differ-ent (P<0. 05) among normal group, diabetic group and blood glucose fluctuation group. The 24 hours, pro-teinuria of diabetic group and blood glucose fluctuation group was higher than that in normal group[( 100. 38±7. 99)mg/24h vs (18. 13±1.41)mg/24h, (123. 71±11.23) mg/24h vs (18.13 ± 1.41 ) mg/24h, P <0.01] , and blood glucose fluctuation group was higher than diabetic group[(123. 71 ± 11.23 )mg/24h vs(100.38±7.99)mg/24h, P <0.05] . Conclusions The blood glucose fluctuation diabetic rats model was successfully induced by the method of subcutaneous insulin injection in diabetic rats twice daily. Key words: Diabetes mellitus, experimental;  Blood glucose;  Models, animal