APP17肽对D-半乳糖脑老化小鼠海马凋亡相关基因表达的影响

目的 研究APP17肽对D-半乳糖脑病小鼠海马神经元凋亡的影响。方法 用D-半乳糖制备脑老化模型，皮下注射APPl7肽治疗D-半乳糖脑老化小鼠，3个月后取脑组织做Bcl-2、Bax、cREB、AKt、AIF免疫组织化学染色。结果 D-半乳糖脑病小鼠海马内Bax、AIF阳性反应神经元胞浆与突起深染，而正常小鼠及APPl7肽保护的D-半乳糖小鼠海马阳性细胞数目少，染色淡；D-半乳糖小鼠海马内Bcl-2、CREB、AKt阳性细胞数日少，染色淡；而正常小鼠及APP17肽保护的D-半乳糖小鼠海马阳性反应神经元胞浆与突起深染。结论 促进凋亡的Bax、AIF在D-半乳糖小鼠海马表达增加；抑制凋亡的Bcl-2、CREB、AKt在D-半乳糖小鼠海马表达降低。APP17肽能影响D-半乳糖脑病小鼠脑内Bcl-2、Bax、CREB、AKt、AIF的表达，使之接近正常。

THE EFFECT OF APP17 ON MODULATION OF Bcl-2, Bax, CREB, AKt, AIF EXPRESSIONS IN HIPPOCAMPAL NEURONS OF D-GALACTOSE INDUCED BRAIN AGING OF THE MICE

Objective To investigate the effect of the peptide APP17 on regulating the expression of Bcl\|2,Bax,cAMP response element binding Protein(CREB),Ser\|Thr kinase B/protein kinase B(Akt/PKB),apoptosis inducing factor(AIF) in neurons of the hippocampus from the D\|gal mouse. Methods D\|gal mouse models were established by injection of D\|gal.In experimental group,these models were injected with APP17 petide subcutaneously and their brain sections were taken after 3 months of survival.The immunohistochemical staining of these sections was then performed with Bcl\|2,Bax,CREB,Akt,AIF antibody. Results Bax,AIF positive neurons were widely distributed in the hippocampus of the D\|gal mice,and the cytoplasm was darkly stained.In contrast,positive cells in the hippocampus were poorly stained in those normal mice and the APP17 peptide\|treated D\|gal mice.But Bcl\|2,CREB,AKt positive neurons were widely distributed in the hippocampus of those normal mice and the APP17 peptide\|treated D\|gal mice,and the cytoplasm was darkly stained.In contrast,positive cells in the hippocampaus were poorly stained in the D\|gal mice.Conclusion\ The expression of Bax and AIF could be increased in the hippocampus of D\|gal mice.But the expression of Bcl\|2,CREB,AKt decreased in the hippocampus of D\|gal mice.The APP17 can regulate the distribution of Bcl\|2,Bax,CREB,Akt,AIF in the brain of D\|gal mice and return them to normal situation.