四種miRNA在神經(jīng)干細(xì)胞與運動神經(jīng)元以及神經(jīng)干細(xì)胞分化過程中的表達(dá)研究
[Abstract]:BACKGROUND: BMSCs are one of the most widely studied adult non-neural tissue-derived neural stem cells. At present, the molecular mechanism of directional differentiation of BMSCs into neurons is still unclear, because of the rich and high specificity of microRNAs-124 and microRNAs-128 in the nervous system. This experiment induced BMSCs to differentiate into neurons in vitro, and observed microRNAs-124 and microRNAs-128. The expression of iR-128 in order to understand their role in BMSCs directed differentiation into neurons.
AIM: To investigate the role of microRNAs-124 and microRNAs-128 in BMSCs-induced neuronal differentiation by detecting the expression of microRNAs-124 and microRNAs-128 during BMSCs-induced neuronal differentiation.
METHODS: BMSCs were isolated and cultured in vitro by whole bone marrow culture method. BMSCs were purified according to the adherence ability of the cultured cells. The morphological changes were observed under inverted microscope. BMSCs were subcultured to the third generation. Some of the cells were detected by CD71 immunofluorescence technique, and the others were induced by adding induced differentiation medium. Differentiation. Then, using the TaqMan MicroRNA Assay real-time PCR technique of ABI Company, the total RNA was first retrieved into a cDNA by two-step method, and then the expression changes of microRNA-124 and microRNA-128 in BMSCs induced differentiation were detected.
Results: The expression of Mi-124 in differentiated BMSCs neurons was 0.051 times higher than that in undifferentiated BMSCs neurons (P 0.05), and the expression of Mi-128 in differentiated BMSCs neurons was 0.070 times higher than that in undifferentiated BMSCs neurons (P 0.05).
Conclusion: Mi-124 and Mi-128 play important roles in the differentiation of BMSCs into neurons.
BACKGROUND: Neural stem cells are a group of cells with the potential of self-renewal, self-proliferation and multi-differentiation. NSCs can induce the differentiation of cholinergic neurons directionally; Hox is one of the key factors for the development of motor neurons (MNs) in vivo, and Mi-126 can regulate Hoxa9 by binding to homologous frameworks. Therefore, we pass on Mi-31 is an embryonic stem cell-specific niRNA. We isolate and induce spinal cord stem cells (SCSCs) by culture and isolate and purify embryonic spinal cord-derived motor nerves by immunomagnetic beads sorting. We then examined the expression of microRNAs-126 and microRNAs-31 in the differentiation of NN and SCSCs to explore their roles in the differentiation of neural stem cells.
Objective: To investigate the expression of microRNAs-126 and microRNAs-31 in the differentiation of neural stem cells (NSCs) and neural stem cells (NSCs).
METHODS: Neural stem cells (NSCs) were isolated from spinal cord of 17-day-old embryonic rats and cultured for passage and amplification. Neuroepithelial stem cell proteins (Nestin) of the third generation NSCs were detected by immunofluorescence assay. Then, RA, Shh, NT-3 and BDNF were applied to the neurons. Stem cells were induced to differentiate. Two weeks after differentiation, the expression of choline acetyltransferase (ChAT), a specific marker of cholinergic neurons, was detected by immunofluorescence assay. In another experiment, we isolated and purified embryonic spinal cord-derived motor neurons by immunomagnetic beads. Finally, ABI's TaqMan MicroRNA As was used. To observe the expression of microRNAs-126 and microRNAs-31 in NN and neural stem cell differentiation by real-time PCR.
Results: The expression of Mi-126 in SCSC was 0.142 times as high as that in differentiated cholinergic neurons. The expression of Mi-31 in SCSC was 0.118 times as high as that in differentiated cholinergic neurons. The expression of Mi-126 in cholinergic neurons was 0.002 times as high as that in MNS. The expression of Mi-31 in cholinergic neurons was 56.444 times as high as that in MNS. The expression of cholinergic neurons was 0.169 times that of MNs. Shh was expressed in MNs, but could not be detected in cholinergic neurons by real-time quantitative PCR.
CONCLUSION: The high expression of microRNAs-31 in cholinergic neurons suggests that there may be differences between the cholinergic neurons and the target cells, and microRNAs-126 and microRNAs-31 play an important role in the differentiation of neural stem cells.
【學(xué)位授予單位】:山西醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2010
【分類號】:R329
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