Wnt3a基因修饰减轻阿糖胞苷诱导的小鼠骨髓间充质干细胞损伤的体外研究

In Vitro Effects of Wnt3a Gene Modification on Mitigating Damage of Mouse Bone Marrow Mesenchymal Stem Cells Induced by Ara-C

本研究探讨Wnt3a基因修饰对小鼠骨髓间充质干细胞(MSC)抗阿糖胞苷损伤的作用。通过重组腺病毒系统感染小鼠MSC,建立能够稳定高效表达Wnt3a基因的基因修饰MSC;在体外培养体系中加入不同浓度的阿糖胞分别诱导对基因修饰MSC与未经基因修饰MSC的损伤,设置对应的对照,通过CCK-8法、流式细胞术检测MSC的生长增殖以及凋亡情况;用Western blot测定MSC中与细胞凋亡有关的BCL-2蛋白的表达水平。结果表明,阿糖胞苷对基因修饰MSC的增殖抑制程度较未经基因修饰MSC明显减低,差异有统计学意义(p<0.05);去除阿糖胞苷后,基因修饰MSC的增殖生长能力在72小时后就开始恢复,而未经基因修饰MSC的增殖生长能力在72小时后仍然被抑制。在凋亡方面,阿糖胞苷诱导的基因修饰MSC的凋亡率明显降低(p<0.05),与未经基因修饰MSC相比,基因修饰MSC中BCL-2蛋白的表达上调(p<0.05)。结论:Wnt3a基因修饰能明显减轻阿糖胞苷对小鼠骨髓MSC的损伤作用。

This study was aimed to investigate the protective effect of Wit3a gene modification on mouse bone marrow mesenchymal stem cells aganist the injury induced by Ara-C. The gene-modified MSC steadily expressing Wnt3a were established by adenovirus system. The acute direct damage effects of different concentrations of Ara-C on the unmodified MSC and the gene-modified MSC were assessed by using an in vitro culture system, and the corresponding controls were set. The proliferation and apoptosis of MSC exposed to Ara-C were detected by cell count kit-8 （CCK-8） and flow cytometry. The expression of BCL-2 protein related with cell apoptosis was assayed by Western blot. The results indicated that as compared with unmodified MSC, Ara-C exhibited a less inhibitory effect on the proliferation of gene-modified MSC. There was obvious difference between unmodified MSC and gene-modified MSC （p 〈 0.05 ）. The proliferation of gene-modifled MSC began to recover at 72 hours after removal of Ara-C. However, unmodified MSC showed sustained suppression of proliferation after withdrawal of Ara-C. In apoptosis, the apoptosis rate of gene-modified MSC induced by Ara-C was significantly lower than those of unmodified MSC （p 〈 0.05 ）. In addition, the expression levels of BCL-2 protein in gene-modified MSC were up-regulated compared with unmodified MSC （p 〈 0.05）. It is concluded that Wnt3a gene modification can significantly mitigate the damage of mouse bone marrow MSC induced by Ara-C.