稳表达人HSP72的人脐带间充质干细胞株的构建
2016-11-14王珍赵昌林骆敏翔
王珍+赵昌林+骆敏翔



[摘要]目的 构建含人HSP72的慢病毒,筛选获得稳定表达HSP72的hUC-MSC细胞系。方法 采用PCR方法从MGC fully sequenced human HSPAIA cDNA中调取HSP72基因的完整序列,利用双酶切及体外重组的方法获得pLV-HSP72-EGFP(2A)质粒,经PCR、测序方式鉴定成功后,对病毒进行包装。用病毒感染hUC-MSC,并用Puro进行抗性筛选可稳定表达HSP72的hUC-MSC细胞系。结果 构建的pLV-HSP72-EGFP(2A)测序结果与GenBank收录序列一致,包装得到pLV-HSP72-EGFP(2A)病毒,筛选获得稳定表达HSP72的hUC-MSC细胞系,ELISA方法检测显示获得的细胞株可过表达HSP72。结论 构建了获得稳定表达HSP72的hUC-MSC细胞系。
[关键词]HSP72;人脐带间充质干细胞;慢病毒载体;转染
[中图分类号] R329.2 [文献标识码] A [文章编号] 1674-4721(2016)09(b)-0004-05
[Abstract]Objective To construct Lenti-viral Vector carrying human HSP72 gene,and to screen the hUC-MSC cell line with stable expression of HSP72.Methods The human HSP72 cDNA was amplified from "MGC fully sequenced human HSPAIA cDNA" by PCR.pLV-HSP72-EGFP (2A) plasmid was obtained by double enzyme digestion and in vitro recombination,then was confirmed by PCR and DNA sequencing.The pLV-HSP72-EGFP (2A) virus was packaged.hUC-MSC was infected by the virus,and the hUC-MSC cell lines stably expressing HSP72 were screened by Puro.Results The recombinant pLV-HSP72-EGFP (2A) was constructed.The sequence was consistent with that reported in GenBank.The pLV-HSP72-EGFP (2A) virus was packaged and infected hUC-MSC.By ELISA,it was confirmed that the HSP72 protein could be expressed and secreted into the supernatant of hUC-MSC strain culture.Conclusion hUC-MSC cell line with stable expression of HSP72 is constructed.
[Key words]Heat shock protein 72;Human umbilical cord mesenchymal stem cell;Lenti-viral Vector;Transduction
阿尔茨海默病(Alzheimer disease,AD)是老年痴呆中最常见的一种类型,其患病率随年龄增高而升高,在65岁以上人群中约为5%,85岁以上人群中约为20%[1]。有研究结果发现,分子伴侣的主要成分HSP72可以通过减少Aβ的聚集,促进Aβ的清除,减少tau蛋白的过度磷酸化,减少神经元的丢失,促进神经突触的可塑性等途径参与AD发病进展的多个环节,是防治AD的非常有价值的靶点之一[2]。基因治疗是近年来研究热度非常高的一种治疗策略,借助基因治疗,寻找一种稳定、长效脑内表达HSP72的给药方法和策略值得进一步探讨。本研究通过第三代慢病毒载体系统,将HSP72插入慢病毒载体,并选择具有神经细胞分化潜能、来源丰富、无伦理学争议的人脐带间充质干细胞(human umbilical cord mesenchymal stem cells,hUC-MSC)作为工具细胞,建立一种HSP72过度表达与hUC-MSC移植结合起来的治疗方法和策略,为进一步动物实验疗效评估和应用安全性评估奠定基础。……