人骨髓间质干细胞分化为神经元样细胞及运动神经元生存蛋白表达的研究  

Human mesenchymal stem cells differentiat into neuron-like cells and show SMN protein expression

作　　者：杨晓苏[1] 吴海香[1] 肖波[1] 

机构地区：[1]中南大学湘雅医院神经内科,长沙410008

出　　处：《中华医学杂志》2005年第16期1125-1128,共4页National Medical Journal of China

基　　金：国家自然科学基金资助项目 ( 30170330 );湖南省自然科学基金资助项目(02JJY3016)

摘　　要：目的　定向诱导人骨髓间质干细胞(hMSC)分化为神经元样细胞,并检测诱导前后细胞的运动神经元生存(SMN)基因mRNA及蛋白质的表达。方法　分离和纯化hMSC;在体外用碱性成纤维细胞生长子预诱导hMSC,再用二甲基亚砜和丁化羟基苯甲醚诱导hMSC分化为神经元样细胞;用免疫细胞化学方法鉴定诱导前后的细胞是否表达神经元特异性标志物神经元稀醇化酶(NSE)、神经丝蛋白(NF)以及SMN蛋白;用RT- PCR检测诱导前hMSC及诱导后神经元样细胞SMN基因mRNA的表达。结果　hMSC诱导3h后,大多数细胞转变为类似于神经元的形态,有长的突起,相互之间连接呈网状。NSE、NF进行鉴定,结果显示NSE、NF呈阳性。诱导前的hMSC及诱导后的神经元样细胞均可见SMN基因mRNA表达,但诱导后表达增加,差异有统计学意义(P<0 .01),且诱导后神经元样细胞SMN蛋白表达为阳性。结论　hMSC能分化为神经元样细胞,并表达神经元的特异性标志物。hMSC分化的神经元样细胞既能高表达SMN基因的mRNA,也表达SMN蛋白。Objectives To investigate the mRNA and protein expression of SMN gene in neuron-like cells by inducing MSC to differentiate into neuron-like cells. Methods Human MSC(hMSC) were isolated and purified. Human MSC were treated with basic fibroblast growth factor (bFGF) before inducing hMSC to differentiate into neuron-like cells with dimethylsulfoxide (DMSO) and butylated hydroxyanisole (BHA). The expression of NSE, NF, and SMN protein in neuron- like cells were detected by immunohistochemistry. The expression of SMN mRNA were detected with reverse transcription-polymerase chain reaction (RT-PCR). Results Human MSC progressively assumed neuronal morphological characteristics after being induced for 3 hours. Cell bodies had long processe contacting with each other. The neuronal marker of NSE and NF was positive in neuron-like cells. Both hMSC and neuron-like cells expressed the mRNA of SMN gene. Compared with hMSC the latter expressed highly the mRNA of SMN gene and it was significance ( P <0.01). SMN protein was only expressed in neuron-like cells. Conclusions Human MSC are able to differentiate into neuron-like cells with expressing the neuronal marker. Neuron-like cells can express highly the mRNA of SMN gene and express SMN protein.

关 键 词：神经元样细胞 运动神经元生存蛋白 间质干细胞分化 表达的研究 人骨髓间质干细胞 免疫细胞化学方法 基因MRNA表达 特异性标志物 碱性成纤维细胞 SMN蛋白 分离和纯化 二甲基亚砜 神经丝蛋白 PCR检测 SMN基因 定向诱导 蛋白表达 

分 类 号：R329.2[医药卫生—人体解剖和组织胚胎学] R746[医药卫生—基础医学]