APP17肽对糖尿病脑病小鼠海马IRS-1、IGF-1R表达的影响

THE ROLE OF APP17 ON MODULATION OF IRS-1 AND IGF-1R EXPRESSIONS IN HIPPOCAMPAL NEURONS OF DIABETIC MICE

目的 通过对胰岛素受体底物 1(IRS 1)、胰岛素样生长因子 1受体 (IGF 1R)在海马表达的观察 ,研究APP17肽对糖尿病脑病小鼠海马神经元IRS 1、IGF 1R的影响。 方法 用链脲佐菌素 (STZ)诱发小鼠糖尿病模型 ,并皮下注射APP17肽对糖尿病小鼠进行治疗 ,4周后取脑组织做IRS 1、IGF 1R免疫组织化学染色。 结果 糖尿病小鼠海马内IRS 1、IGF 1R阳性反应神经元胞浆与突起深染 ,而正常小鼠及APP17肽保护的糖尿病小鼠海马阳性细胞数目少 ,染色淡。 结论 糖尿病小鼠海马IRS 1、IGF 1R广泛表达 ;APP17肽能影响糖尿病脑病小鼠脑内IRS 1,IGF 1R的表达 。

Objective To investigate the effect of a peptide,APP17,on regulating the expression of insulin receptor substrate\|1(IRS\|1) and insulin\|like growth factor (IGF\|1R) in neurons of the hippocampus from diabetic mouse. Methods Diabetic mouse models were established by injection of streptozotion.In experimental group,these models were injected with APP17 peptide subcutaneously and their brain sections were taken after 4 weeks of survival. The immunohistochemical stainning of these sections were then performed with IRS\|1 and IGF\|1R antibody.With regard to control groups,the mouse models were only injected saline and gone through the same procedure of immunohistochemistry together with normal mice. Results IRS\|1 and IGF\|1R positive neurons were widely distributed in the hippocampus of the diabetic mice,and the cytoplasm was darkly stained.In the contrast,positive cells in the hippocampus were lightly stained in those normal mice and the APP17 peptide\|treated diabetic mice. Conclusion The expression of IRS\|1 and IGF\|1R could increase in the hippocampus of dabetic mice.The APP17 can regulate the distribution of IRS\|1 and IGF\|1R in the brain of diabetic mice and return them to normal situation.