ABSTRACT
Objective To establish rat model of type 2 diabetes through a single subcutaneous injection of lipopolysaccharide which induced chronic inflammation.Methods The male Wistar rats(n = 30)were randomly divided control group (n = 10)and model group (n=20).Model group with LPS (300 μg·kg-1 ·day-1 )subcutaneous injection of eight weeks,rats in control group received isometric stroke-physiological saline solution injection in the same way.The changes in appearance,weight and fasting blood glucose (FBG)of rats were observed every week.At the end of the 8th week,thelevels of tumor necrosis factor a (TNF-α), interleukin-1(IL-1),interleukin-6 (IL-6),monocyte chemotactic protein-1(MCP-1)and fasting insulin(FINS)were measured.Oral glucose tolerance test (OGTT)and insulin release test(IRT)were also performed.The successful rat model was determined by the standards that FBG was ≥11.1 mmol/L.Results Model group rats reached the standard of type 2 diabetes after six weeks of LPS injection.Model group blood sugar is significantly higher than the control group (P <0.05).In addition,model group′s expression level of inflammatory cytokines in serum TNF-α,IL-1,IL-6,MCP-1 and FINS were significantly higher than control group (P <0.05).Oral glucose tolerance test,blood glucose levels higher than normal in model group,the insulin peak is lower than the normal group (P <0.05).Conclusion The success of establishing the animal model of type 2 diabetic rats which were injected of low dose of LPS by subcutaneous may be provide certain help for the etiology of diabetes research.