大鼠骨髓基质细胞经枕大池移植后在损伤脑组织中的存活和分化

目的:探讨MSCs经枕大池移植到创伤性脑损伤模型大鼠的蛛网膜下腔后迁移到损伤脑组织存活并分化为神经细胞的能力。方法:采用Feeney’s自由落体脑创伤模型,建立23个大鼠脑创伤模型。从SD大鼠的后肢骨髓分离培养得MSCs,将第三代的MSCs以BrdU在体外标记。随机取15个脑创伤大鼠模型接受MSCa枕大池注射(脑创伤细胞移植组);随机取6个脑创伤大鼠模型接受枕大池注射生理盐水(脑创伤生理盐水组);取6个正常大鼠接受枕大池注射MSCs(正常大鼠细胞移植组)。定期杀死大鼠制作脑组织石蜡切片,行BrdU、BrdU-GFAP、BrdU-MAP2的免疫组织细胞化学染色。另取两个脑创伤大鼠在创伤1周后脑石蜡切片行HE染色。结果:观察到脑创伤细胞移植组石蜡切片BrdU染色可见BrdU阳性细胞,细胞进入皮质下的最大距离为3 mm。双标记染色可见部分BrdU阳性细胞胞质呈现GFAP或MAP_2染色阳性。而另外两组均未见阳性细胞。结论:大鼠MSCs具有从蛛网膜下腔迁移入损伤脑组织存活一定时期并分化为神经细胞的能力。

Marrow Stromal Cells Migrate into Injuried Brain and Differentiate into Neural Cells after Injection into Cistern Maganum

Aim:To investigate the potential of mairow stromal cells (MSCs) to migrate into the injuried brain, survive and differentiate into neural cells when they are injected into the subarachnoid space. Methods: MSCs were available from SD rat. Prelabeled with BrdU, MSCs were transplaned into subarachnoid space in one group of rats via cistern magnum. Rats were sacrified at different time points and brain sections were examined with immunohistochemical staining methods. Results: BrdU-labeled cells were seen. Some of the BrdU-labeled cells were reactive with astrocytic and neuronal markers. Conclusion:Marrow stromal cells have the potential to migrate into injuried brain and differentiate into neural cells via subarachnoid space.