NGF體外誘導(dǎo)hMSCs分化為神經(jīng)元樣細(xì)胞
[Abstract]:Objective: to explore the suitable experimental conditions for the isolation, culture and purification of human bone marrow mesenchymal stem cells (human bone marrow stromal cells) in vitro, and to explore the feasibility of nerve growth factor (NGF) inducing the differentiation of human bone marrow mesenchymal stem cells (hMSCs) into nerve cells in vitro. Methods Human bone marrow low density mononuclear cells were isolated from normal adult iliac bone by using density gradient centrifugation and whole bone marrow adherent method. The purified hMSCs.2 was cultured and digested in the DMEM medium containing fetal bovine serum for the second and fourth generation of HMSCs. After digesting and digesting, MTT method was used to depict the cell proliferation curve. 3. The 3rd generation hMSCs were obtained, which were close to 70%, 80% of the cells fused. The experimental group was divided into two groups: the hMSCs was preinduced by basic fibroblast growth factor (Basic fibroblast growth) for 24 h, and then induced by 50ng / ml 100ng / ml NGF medium, while the control group was treated with the same amount of serum-free medium. The morphological changes of cells in each group were observed by morphological observation. 4 cells were cultured on the 1st and 3rd day after induction, and the expression of NSCs labeled neuron specific enolase (NSE),) nestin (Nestin) was detected by immunohistochemical method. The number of positive cells was calculated with moderate cell density visual field, and the proportion of positive cells in each group was compared. Results the growth curve of bone marrow mesenchymal stem cells (BMSCs): the first day of culture was the incubation period, the cell growth was slow, then the cell proliferation accelerated and rapidly entered the logarithmic growth phase, and reached the peak at the 6th day, then the cell proliferation slowed down. After 2hMSCs induced differentiation, morphological changes occurred in some cells at 12 h, showing that the cell bodies became larger, and the slender processes with axons and dendrites became more obvious 24 hours later. Some cells could also be seen network arrangement, the phenomenon of cell death was not obvious, the control group had no obvious morphological changes, The expression of NSE-nestin was positive in different concentrations of NGF, and the cell bodies and processes were stained brown. No positive results were found in the control group. 4 the differentiation rate of neuron-like cells in different concentrations of nerve growth factor was different. The differentiation rate of 200ng/ml was (35.6 鹵4.4), (61.9 鹵3.4), (57.3 鹵5.7)% and (57.2 鹵4.8), respectively. There were significant differences in the number of NGF-induced positive cells in different concentrations (F338.71P0.05). The number of positive cells in 100 ng / ml, 150ng/ml and 200ng/ml groups was higher than that in 50ng/ml group (P0.01). There was no significant difference (P0.05). 5100ng / ml NGF differentiation rate was (27.8 鹵5.6), (60.5 鹵6.7)%, (61.9 鹵3.4)% and (30.7 鹵3.5) in 0.5 day, (60.5 鹵6.7), (61.9 鹵3.4)% and (30.7 鹵3.5), respectively. There was significant difference in the number of positive cells induced by nerve growth factor at the same concentration at different time (FF136.03 / P0.01), and the differentiation rate was the highest on the 3rd day, but compared with the number of positive cells on the first day. There was no significant difference (P0.05), but the number of positive cells decreased on the 5th day, which was significantly different from that on the 1st day (P0.01). Conclusion the density gradient centrifugation combined with the whole bone marrow adherent method is a simple method for the isolation and purification of hMSCs in vitro. 2NGF can induce hMSCs to differentiate into neuron-like cells with long survival time of 100ng / ml NGF can promote hMSCs to neuron-like cells. The role of cell differentiation.
【學(xué)位授予單位】:南華大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2008
【分類號】:R329
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