人脐血单个核细胞诱导分化为神经元样细胞

目的 探讨人脐血单个核细胞体外向神经元样细胞定向诱导分化的条件。方法 无菌条件下采集正常人脐血，分离单个核细胞。用DMEM/F12培养基进行纯化和扩增培养。取扩增5代的间充质干细胞(MSC)，分别用B-巯基乙醇(B—ME)、二甲基亚砜(DMSO)、神经条件培养液诱导脐血MSC向神经元样细胞分化。免疫组化法检测脐血MSC的Nestin表达和神经元样细胞特异性标志。结果 脐血原代和2、5代MSC的Nestin表达阳性率分别为6．7％、12．4％和20．8％。神经条件培养液诱导神经元样细胞阳性率最高达36％，B—ME、DMSO分别为33％和25％。结论脐血MSC具有神经干／祖细胞的特性，在一定条件下能向神经元样细胞分化。

Induced differentiation of human cord blood monocytes into neuron-like cells in vitro]

OBJECTIVE: To probe the conditions for inducing human cord blood monocytes to differentiate into neuron-like cells. METHODS: The mononuclear cells were isolated from human umbilical cord blood samples and plated in 25-mm culture flasks containing DMEM/F12 medium. The fifth passage of mesenchymal stem cells (MSCs) were induced by beta-mercaptoe- thanol (beta-ME), dimethyl sulfoxide (DMSO) and conditioned medium for neuron induction, respectively, to differentiate into neuron-like cells. The expression of nestin, neuron-specific enolase (NSE) and neurofilament (NF) on the treated cells were detected by immunocytochemical method. RESULTS: Nestin expression were found in 6.7% of the primary, 12.4% of the second passage, 20.8% of the fifth passage of MSCs, respectively. Thirty-six percent of cell cultures treated with the conditioned medium for neuron induction were immunoreactive for NSE and NF, and 33% of the cells induced by beta-ME and 25% of the cells by DMSO also expressed NSE and NF. CONCLUSION: Cord blood MSCs possess some features of neural stem cells, and have the capacity to differentiate into neuron-like cells under proper conditions.