lncRNA uc.48+对2型糖尿病大鼠肝糖原的影响

Effect of lncRNA uc. 48 + on liver glycogen in type 2 diabetic rats

目的探讨长非编码核糖核酸uc.48+小干扰RNA(lncRNA uc.48+siRNA)对2型糖尿病大鼠肝糖原异常的影响及可能机制。方法采用高糖高脂饲料喂养及链脲佐菌素(STZ)建立糖尿病模型,造模成功后,lncRNA uc.48+siRNA尾静脉注射至大鼠体内,动态监测血糖变化及注射1周后检测肝糖原含量;蛋白印迹及qPCR检测各组大鼠肝脏组织中葡萄糖激酶(glucokinase,GK)mRNA和蛋白表达变化。结果糖尿病模型大鼠用uc.48+小干扰RNA处理后,餐后血糖、空腹血糖较模型大鼠降低。肝糖原检测显示,糖尿病模型组大鼠肝糖原较对照组明显降低,糖尿病模型大鼠加uc.48+小干扰RNA处理后,肝糖原的合成较糖尿病模型组大鼠增多。糖尿病模型组肝脏GK mRNA和蛋白表达较对照组明显减少,经uc.48+小干扰RNA干预后,肝脏GK的mRNA与蛋白表达较糖尿病模型组明显增加。结论 uc.48+小干扰RNA可降低2型糖尿病模型大鼠升高的血糖,增加肝糖原合成,其机制涉及增加GK及磷酸化Akt1表达。

Aim To observe the effect of uc.48 + small interference RNA(siRNA) on liver glycogen abnormality in type 2 diabetic rats and its possible mechanism. Methods The diabetes model was established by feeding high glucose and high fat diet combined with streptozotocin(STZ). After the success of the model, the long noncoding RNA uc.48 + siRNA was injected into the rat body via tail vein. The changes of blood glucose and the content of liver glycogen were detected dynamically, and the liver glycogen was detected one week after injection. Glucokinase(GK) mRNA and protein expression in liver tissues of each group were detected by qPCR and Western blot. Results It was observed that postprandial blood glucose and fasting blood glucose decreased in diabetic model rats after treated with uc.48 + siRNA compared with those in model rats. The level of liver glycogen in diabetic model rats was significantly lower than that in control group. The synthesis of liver glycogen in diabetic model rats with uc.48 + siRNA treatment increased compared with that in diabetic model group. The expressions of GK mRNA and protein in the diabetic model group were significantly lower than those in control group. The expression of GK mRNA and protein markedly increased after uc.48 + siRNA treatment. Conclusions uc.48 + siRNA reduces blood glucose and increases glycogen synthesis in type 2 diabetic rats, and its mechanism may involve in increasing GK expression and Akt1 phosphorylation.