Restoration of SMN expression in mesenchymal stem cells derived from gene-targeted patient-specific iPSCs

Restoration of SMN expression in mesenchymal stem cells derived from gene-targeted patient-specific iPSCs
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源自基因靶向患者特异性 iPSC 的间充质干细胞恢复 SMN 表达

DOI:
10.1007/s10735-017-9744-1
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发表时间:
2017-12
影响因子:
3.2
通讯作者:
冯劢
冯劢
中科院分区:
生物学4区
文献类型:
--
作者:
冯劢

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脊髓性肌萎缩症(SMA)主要是一种神经退行性疾病,由运动神经元生存基因1(SMN 1)纯合缺失引起,从而降低SMN蛋白表达。间充质干细胞(MSC)参与SMA的治疗。在本研究中,我们使用rDNA靶向载体在SMA患者产生的诱导多能干细胞(iPSC)的核糖体DNA(rDNA)位点过表达外源性SMN 1。基因靶向的患者iPSC分化为MSC(SMN 1-MSC)。在SMN 1-MSC中检测到SMN蛋白的表达水平比在源自患者iPSC的MSC中检测到的SMN蛋白的表达水平高2.1倍,并且免疫荧光分析的结果显示SMN 1-MSC和源自正常人iPSC的MSC(h-MSC)之间的SMN核结构(gems)的量没有差异。这些发现提供了一种新的策略,获得基因靶向的骨髓间充质干细胞在自体细胞为基础的治疗的潜在临床应用。
Spinal muscular atrophy (SMA) is primarily a neurodegenerative disease caused by the homozygous deletion of the survival motor neuron 1 (SMN1) gene, thereby reducing SMN protein expression. Mesenchymal stem cells (MSCs) have been implicated in the treatment of SMA. In the present study, we overexpressed exogenous SMN1 at the ribosomal DNA (rDNA) locus of induced pluripotent stem cells (iPSCs) generated from a SMA patient using an rDNA-targeting vector. The gene-targeted patient iPSCs differentiated into MSCs (SMN1-MSCs). A 2.1-fold higher expression level of SMN protein was detected in SMN1-MSCs than that detected in MSCs derived from patient iPSCs, and the results of the immunofluorescence analysis showed no difference in the quantity of SMN nuclear structures (gems) between SMN1-MSCs and MSCs derived from normal human iPSCs (h-MSCs). These findings provide a novel strategy for obtaining gene-targeted MSCs for potential clinical applications in autologous cell-based therapy.
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