骨髓间充质干细胞治疗肾缺血再灌注损伤的免疫调节机制

Bone marrow mesenchymal stem cells protect against renal ischemia-reperfusion injury through immune regulatory mechanism

背景:干细胞治疗肾缺血再灌注损伤一直是众多学者研究的热点,其机制相当复杂,不能用单纯的干细胞分化机制来解释,是多种机制共同参与的结果。目的:探讨骨髓间充质干细胞治疗肾缺血再灌注损伤时对免疫细胞的影响,从而初步总结骨髓间充质干细胞治疗肾缺血再灌注损伤的免疫调节机制。方法:首先建立SD大鼠肾缺血再灌注损伤模型,将体外培养纯化的SD大鼠骨髓间充质干细胞移植入模型体内,采用流式细胞仪检测技术,分析大鼠脾细胞中CD4+CD25+调节性T细胞的比例,探讨骨髓间充质干细胞治疗肾缺血再灌注损伤时对免疫细胞的影响,然后将上述受体SD大鼠的脾细胞移植到裸鼠体内,再使该裸鼠经历肾缺血再灌注损伤,监测裸鼠肾损伤前后肾功能和肾脏组织学变化。结果与结论:骨髓间充质干细胞移植能够明显抑制肾缺血再灌注损伤导致的大鼠脾细胞CD4+CD25+调节性T细胞比例的降低;移植此组大鼠的脾细胞给裸鼠,可以明显保护裸鼠肾缺血再灌注损伤,表现为血清肌酐和尿素氮的降低以及肾小管病理损伤评分降低。因此,骨髓间充质干细胞可以通过调节免疫系统来治疗肾缺血再灌注损伤。

BACKGROUND：Stem celltherapy for renal ischemia-reperfusion injury has been the hot topics for many scholars. Its mechanism is very complex, which could not be explained by simple mechanism of stem cells differentiation. It is the result involving a variety of mechanisms. OBJECTIVE：To investigate the influence on immune cells during the bone marrow mesenchymal stem celltherapy for renal ischemia-reperfusion injury, then to preliminary summarize the immune regulation mechanism of bone marrow mesenchymal stem celltherapy for renal ischemia-reperfusion injury. METHODS：First, we established a model of renal ischemia-reperfusion injury in rats and, cultured and purified rat bone marrow mesenchymal stem cells in vitro. Then, the bone marrow mesenchymal stem cells were transplanted into the rat models. Using flow cytometry detection technology, we analyzed the proportion of CD4＋CD25＋regulatory T cells of rat spleen cells, discussed the effects on immune cells during the bone marrow mesenchymal stem celltherapy for renal ischemia-reperfusion injury, and then transferred the rat’s spleen cells to the nude mice which were subjected to renal renal ischemia-reperfusion injury. Renal function and renal＆amp;nbsp;histological changes of nude mice were assessed. RESULTS AND CONCLUSION：The bone marrow mesenchymal stem celltransplantation could significantly inhibit the decrease of CD4＋CD25＋regulatory T cellof spleen cells in rats with renal ischemia-reperfusion injury. The transplantation of spleen cells from the above-mentioned rats to nude mice could obviously protect nude mice from renal ischemia-reperfusion injury, characterized by lower serum creatinine, blood urea nitrogen and renal tubule pathologic damage score. Therefore, bone marrow mesenchymal stem cells have protective effects on renal ischemia-reperfusion injury by regulating the immune system.