激活态雪旺细胞生长相关蛋白43 mRNA表达的研究  

Gene expression of growth associated protein 43 in activated Schwann cells

作　　者：劳杰[1] 蒋良福[1] 顾玉东[1] 

机构地区：[1]复旦大学华山医院上海市手外科研究所复旦大学华山医院手外科,上海200040

出　　处：《中华骨科杂志》2005年第6期372-374,共3页Chinese Journal of Orthopaedics

基　　金：国家自然科学基金资助项目(30470659);国家973创伤基础基金资助项目(G199054202);国家留学归国人才基金资助项目

摘　　要：目的分析激活态雪旺细胞较正常雪旺细胞生长相关蛋白43(growthassociatiopnrotein43,GAP43)的基因表达变化。方法选取10只SD大鼠,将大鼠右上肢正中神经在腋部切断,预变性,1周后取1cm长正中神经采用双酶消化法获取雪旺细胞并进行激活得到激活态雪旺细胞;取左上肢正常正中神经经双酶消化法获取正常态雪旺细胞作为对照。自雪旺细胞提取mRNA,应用rt-PCR的方法扩增GAP43基因,取PCR产物行1%琼脂糖凝胶电泳,用低浓度的绿色荧光核酸胶染剂染色,测量荧光强度,计算目标基因和内标基因(GAPDH)PCR产物的荧光强度比值,以配对t检验比较实验组和对照组结果。结果激活态雪旺细胞GAP43PCR产物荧光强度比值较正常雪旺细胞明显增高,差异有统计学意义(P=0.003)。表明激活态雪旺细胞较对照组正常雪旺细胞GAP43mRNA表达明显增多。结论激活态雪旺细胞GAP43的基因表达较正常雪旺细胞增强,这可能是其促进神经再生的重要机制。Objective To compare activated and normal Schwann cells in GAP43 gene expression. Methods 10 male SD rats, weighed from 100 g to 120 g. The right median nerve of SD rats was transected at the axillary level and was buried in muscle for predegeneration. 1 week later, the distal segment of the transected right median nerve with 1 cm long was harvested. The untreated left median nerve was harvested as control with same length. The epineurium of nerve was stripped, then the nerve tract was cut to small pieces. Schwann cells were obtained by way of double kinases digestion with 0.25% trypsin and 0.03% collegenase. The right median nerve was activated with additional liquid during digestion so as to obtain the activated Schwann cells. The normal Schwann cells were harvested from left median nerve. rt-PCR was used for GAP43 gene enlargement. mRNA was distilled from activated Schwann cells and untreated Schwann cells respectively. Then the mRNA was reversely transcripted to cDNA with SuperScriptTM, and cDNA worked as template for PCR enlargement. The product of PCR was separated with 1% agarose gel electrophoresis for 40 -50 min and stained with SYBR Green Ⅰnucleic acid gel. Fluorescence intensity of GAP43 PCR products was measured and then compared between the experiment group and control group. Results The Fluorescence intensity of GAP43 PCR product of activated Schwann cells was higher than that of normal Schwann cell. There was significant difference (P=0.003, Paired t test). It indicated that GAP43 mRNA of activated Schwann cells was much more than that of the normal Schwann cells. Conclusion GAP43 gene expression is up regulated in activated Schwann cells in contrast to normal Schwann cells. Activated Schwann cells secreting more GAP43, which may be one of the important mechanisms in promoting nerve regeneration.

关 键 词：激活态雪旺细胞 生长相关蛋白 表达的研究 PCR产物 protein 琼脂糖凝胶电泳 双酶消化法 基因表达变化 正中神经 荧光强度 mRNA表达 P43基因 SD大鼠 细胞提取 目标基因 神经再生 对照组 右上肢 预变性 左上肢 低浓度 实验组 

分 类 号：R346[医药卫生—基础医学]