中文摘要：

目的：观察诱导性多能干细胞来源的间充质干细胞（iPSC－MSCs）对氯化钴（CoCl2）诱导的PC12细胞损伤的影响，并探讨其可能机制。方法：用CoCl2处理PC12细胞建立化学损伤模型，加入iPSC－MSCs共培养。用细胞计数试剂盒－8（CCK－8）比色法检测细胞存活率，Annexin V／PI双染流式细胞术检测细胞凋亡比率，JC－1染色流式细胞术检测细胞线粒体膜电位，免疫荧光观察iPSC－MSCs向PC12细胞转移线粒体的情况。结果：用CoCl2（400μmol／L）处理PC12细胞24 h可使其凋亡明显增多，线粒体膜电位明显下降。与iPSC－MSCs共培养能减轻PC12细胞的凋亡，使其膜电位恢复。 iPSC－MSCs可以与PC12细胞间形成隧道纳米管并向PC12细胞转移线粒体。结论：iPSC－MSCs可以减轻CoCl2诱导的PC12细胞损伤，机制可能与其向PC12细胞转移线粒体有关。

英文摘要：

AIM：To investigate the effects of induced pluripotent stem cells-derived mesenchymal stem cells （ iPSC-MSCs） on cobalt chloride （ CoCl2 ）-induced injuries of PC12 cells and its possible mechanism.METHODS：PC12 cells were exposed to CoCl2 to set up a chemical-induced cellular injury model and were cocultured with iPSC-MSCs.The cell viability was tested by CCK-8 assay.The apoptosis was measured by flow cytometry using Annexin V/PI staining.The mitochondrial membrane potential （MMP） was analyzed by flow cytometry using JC-1 staining.Immunofluorescence was employed to observe mitochondrial transfer from iPSC-MSCs to PC12 cells.RESULTS： Apoptosis of PC12 cells was in-creased and MMP of PC12 cells was decreased after exposed to CoCl2 at concentration of 400μmol/L for 24 h.Coculture of PC12 cells with iPSC-MSCs reduced the apoptosis and recovered the MMP of the PC12 cells.Tunneling nanotubes were formed between iPSC-MSCs and PC12 cells, through which the iPSC-MSCs transferred the mitochondria to the PC12 cells. CONCLUSION：iPSC-MSCs protect PC12 cells from CoCl2-induced injuries, which may be associated with the mitochon-drial transfer from iPSC-MSCs to PC12 cells.