Objective:To clarify the protective effect of ursodeoxycholic acid(UDCA) on antioxidation and antiapoptosis of pancreatic β-cells in STZ-induced diabetic rats. Methods:Rats(n = 40) were received a single injection STZ(50 mg/kg) intraperitoneally to produce a β-cell injury model. Weight-matched normal rats(the control group,n = 10) were injected with the buffer alone. STZ-treated rats with persistent random blood glucose higher than 16.7 mmol/L for 1 week were considered as diabetic(n = 14),then were divided into the following two groups:STZ-induced diabetes group(n = 7) and UDCA-treated diabetes group(n = 7). UDCA(40 mg/kg) was administered daily by intragastric intubations during the experimental period(30 days). The control group and the STZ-induced diabetic group without UDCA treatment were given an equivalent amount of 0.9% NaCl intragastrically. During all experiments period,blood glucose and weight of all rats were assessed. Following 30-days UDCA treatment,all rats were anaesthetized and then killed to remove pancreas and collect the blood sample. The morphological changes of pancreatic β-cells apoptosis were determined by light microscope and TUNEL assay. Serum nitric oxide(NO), matondialdehyde(MDA) concentration and superoxide dismutase(SOD) level in pancreatic tissue were measured. Results:The concentration of blood glucose in diabetic rats was gradually decreased after the UDCA treatment,while still higher than the normal control group at the end of the experiment. The percentage of β-cell apoptosis of UDCA-treated group was significantly lower than that of STZ-induced diabetic group(P < 0.01). The content of serum NO and MDA was significantly elevated in STZ-induced diabetic rats with SOD decreased in pancreas,whereas these parameters became close to the normal after treated with UDCA. Conclusion:UDCA could act as an effective antioxidant agent and protect pancreatic β-cell from apoptosis in STZ-induced diabetes. It suggested that UDCA should have potential benefits in inhibiting the development of pancreas dysfunction in diabetic patients.
朱敏,刘倩琦,郭 梅,费 莉,潘晓勤.熊脱氧胆酸对糖尿病大鼠胰岛β细胞凋亡的保护作用[J].南京医科大学学报(自然科学版英文版),2008,28(3):286-290.