Changes of protein kinase B and phosphorylation expression in the skeletal muscle, liver and pancreas of miniature pig model with type 2 diabetes mellitus model / 天津医药

ABSTRACT

Objective To study the feasibility of Bama miniature pig model establishment of type 2 diabetes mellitus (T2DM) by high-fat and high-sugar diet combined with streptozotocin (STZ), and observe the changes in protein kinase B (PKB) and phosphorylation expressions in skeletal muscle, liver, and pancreatic tissues of the miniature pig model. Methods A total of 10 healthy male Bama miniature pigs were randomly divided into two groupscontrol group (n=5, fed normal diet) and diabetic model group (n=5, fed high-fat and high-sugar diet combined with STZ to establish T2DM Bama miniature pig model). The fasting plasma glucose (FPG) and fasting insulin (FINS) levels were measured, and insulin resistance (HOMA-IR) was calculated in two groups. The PKB and phosphorylation expressions in skeletal muscle, liver and pancreatic tissues were measured using Western blot assay. Results (1) After 10 months of high-fat and high-sugar diet, the body weight, FPG, FINS and HOMA-IR were significantly higher in model group than those of control group (P<0.01). (2) After STZ treatment, compared with control group, there was a further increased level of FPG and a significantly decreased level of FINS in model group (P<0.01). (3) Compared with control group, the PKB and phosphorylation expression levels in skeletal muscle, liver and pancreas were significantly lower in model group (P<0.05). Conclusion The high-fat and high-sugar diet combined with STZ can successfully establish the T2DM miniature pig model. The PKB and phosphorylation expression levels in skeletal muscle, liver, and pancreatic tissues are decreased in model pigs.