人参皂苷Rb1通过JNK/p38 MAPK途径减轻Aβ_(25-35)诱导的胎鼠皮层神经元tau蛋白过度磷酸化

JNK/p38 MAPK involves in ginsenoside Rb1 attenuating beta-amyloid peptide(25-35)-induced tau protein hyperphosphorylation in embryo rat cortical neurons

探讨在Aβ25-35(beta-amyloid peptide(25-35),Aβ25-35)诱导的拟阿尔茨海默病样胎鼠皮层神经元tau蛋白过度磷酸化中,人参皂苷Rb1对tau蛋白磷酸化及JNK/p38 MAPK的可能作用。应用蛋白免疫印迹和免疫细胞化学染色的方法,观察tau蛋白磷酸化和JNK(c-jun N-terminal kinase)/p38 MAPK的表达情况。凝聚态Aβ25-35(20μmol.L-1)作用于皮层神经元12 h,tau蛋白的磷酸化水平明显增高,同时JNK/p38 MAPK的总量及其活性形式——磷酸化JNK/p38 MAPK的蛋白表达水平也增加,人参皂苷Rb1可以减轻tau蛋白的磷酸化水平及JNK/p38MAPK的蛋白水平。人参皂苷Rb1可通过JNK/p38 MAPK途径减轻Aβ25-35诱导的tau蛋白过度磷酸化。

To explore the effect of ginsenoside Rb1 on JNK/p38 MAPK in the process of fl-amyloid peptide （25 -35） -induced tau protein hyperphosphorylation, Western blotting and immunocytochemical stain were performed to observe the tau protein phosphorylation and the expression of JNK/p38 MAPK. The level of tau protein phosphorylation in the sites of Ser39s , Ser199/202 and Thr205 increased after rat cortical neurons exposed to 20μmol·L^-1 Aβ25-35, meanwhile the level of iNK/p38 MAPK also increased after Aβ25-35 treatment for 12 h. Pretreatment with several doses of ginsenoside Rbl markedly attenuated tau protein hyperphosphorylation and the expression of JNK/p38 MAPK. Ginsenoside Rbl markedly attenuated tau protein hyperphosphorylation through JNK/p38 MAPK pathway.