基因重组去整合素rAdinbitor对C6神经胶质瘤细胞FAK-Ras/MAPK通路的影响  

Effects of Recombinant Disintegrin rAdinbitor on FAK-Ras/MAPK Pathway in C6 Glioma Cells

作　　者：赵霆[1] 李金萍[1] 胡燕荣[1] 洪艳[1] 赵宝昌[1] 

机构地区：[1]大连医科大学生物化学与分子生物学教研室,大连116044

出　　处：《生物化学与生物物理进展》2009年第6期702-708,共7页Progress In Biochemistry and Biophysics

基　　金：国家自然科学基金资助项目(30572141)~~

摘　　要：rAdinbitor为大连医科大学生物化学与分子生物学教研室从旅顺产白眉蝮蛇毒腺中采用克隆技术得到的去整合素.之前研究已证明rAdinbitor具有抑制C6神经胶质瘤细胞增殖、促进C6神经胶质瘤细胞凋亡的作用.rAdinbitor对C6细胞作用的分子机制需要进一步研究.在此研究中,用E.coliBL21/pET23b-adinbitor表达rAdinbitor,通过Ni Sepharose 6 Fast Flow亲和层析柱对rAdinbitor进行纯化,纯化蛋白经Western blotting鉴定.用纤连蛋白(fibronectin,FN)诱导C6细胞.通过免疫沉淀和免疫印迹检测不同浓度的rAdinbitor对FN诱导的C6细胞中黏着斑激酶(FAK)、MEK1/2、Caspase-3的表达以及对FAK、ERK1/2活性的影响.研究表明:各实验组不同浓度的rAdinbitor均能明显降低FAK、MEK1/2的表达,对Caspase-3的表达起促进作用,并对ERK1/2的磷酸化有明显的抑制作用;除10mg/LrAdinbitor对FAK磷酸化无明显抑制作用外,其余浓度的rAdinbitor对FAK的磷酸化起了明显抑制作用.这说明rAdinbitor对FAK及其下游Ras-MAPK传导通路的抑制在其抑制C6增殖过程中起了重要作用,Caspase-3表达升高提示,rAdinbitor可能通过抑制ILK及其下游的PI-3K/Akt途径起到了促进细胞凋亡的作用.rAdinbitor was cloned from Gloydius blomhoffi brevicaudus in the laboratory. Previous researches had proved that rAdinbitor could inhibit proliferation of C6 glioma cells as well as promote their apoptosis. The molecular mechanism of rAdinbitor＇s effects on C6 cells need to be further studied, rAdinbitor was expressed in E. coli BL21/pET23b-adinbitor and purified with Ni Sepharose 6 Fast Flow. The purified protein was confirmed by Western blotting. C6 cells were induced with fibronectin （FN）. The effects of rAdinbitor with different concentrations on the expression of FAK, MEK1/2 and Caspase-3 as well as on activity of FAK and ERK1/2 in FN-induced C6 cells were studied by immunoblotting and immunoprecipitation. Results showed that rAdinbitor with different concentrations could obviously reduce the expression of FAK and MEK1/2, increase the expression of Caspase-3, as well as decrease ERK1/2 phosphorylation; besides 10 mg/L rAdinbitor, other concentrations＇ rAdinbitor could inhibit FAK phosphorylation obviously. All those effects were dose-dependent. Results indicate that the effects of rAdinbitor on decreasing expression and activity of FAK and inhibiting Ras-MAPK signaling pathway play an important role in suppressing the proliferation of C6. Furthermore, the increase in Caspase-3 expression implies that the increase in apoptosis of C6 cells might be due to the suppression of rAdinbitor on the activity of ILK and PI-3K/Akt pathway.

关 键 词：白眉蝮蛇 去整合素 rAdinbitor C6神经胶质瘤细胞 纤连蛋白(FN) 

分 类 号：Q71[生物学—分子生物学] R739.41[医药卫生—肿瘤]