大鼠胚胎干细胞系的建立及向神经干细胞分化潜能的研究
[Abstract]:Rats are a very valuable model animal for the study of pathology and pharmacology. Therefore, it is necessary to establish a stable rat embryonic stem cell (rES) differentiation system for the analysis of the early development of rES, the gene function and the application of the gene targeting to the production of human disease animal models. Although the rES cell line with a reproductive system genetic capacity has been successfully established, various molecular networks that maintain its self-renewal and maintain its undifferentiated state have been well disclosed, but the correlation of the rES cell to the three-germ differentiation system and method is very small. The degenerative disease of the central nervous system is a serious threat to human health, and ES cells are expected to provide a source of cell for alternative treatment of nervous system disease cells. To date, there is no report on autologous rES cells to obtain neural stem cells (NS). To study the process of neural differentiation of rES cells, the process of inducing differentiation from functional cells to nerve cells was established, and the neural precursor cells with NS cell characteristics were obtained, which not only provided a theoretical basis for the experimental study of disease cell therapy, But also provides a good model for the early development of the nervous system. This study is to establish a stable in vitro differentiation system to induce differentiation into NS cells with self-renewal and multiple differentiation potential by establishing a rES cell line. It is desirable to provide a theoretical basis for the establishment of a research platform, a pharmacological test and a neural disease model for the development of the nervous system of the rat. The following experimental results were obtained through the study: 1) In this study, the embryonic brain tissue cells of E14. 5DA rats were cultured and cultured under no serum conditions in vitro (addition of bFGF and mEGF growth factor to N2B27). S. The results showed that the NS cell surface marker, Nestin, Olig2, Pax 6, was positive, most of the rNS expression was Mk-67, and it was proved that the rNS was in the form of vigorous proliferation. The expression rate of the surface marker Dcx of the neuron progenitor cells was 0.8%, indicating that it was able to differentiate into the neurons. (2) The in vitro differentiation of rNS was carried out by using the rNS cell differentiation medium, and the results showed that the expression of the surface markers Tuj1, GFAP and 04 of the three nerve cell lines was positive, indicating that the rNS cells could be differentiated into neurons, astrocytes and oligodendrocytes. It was found that the expression of MAP2, GABA and ChAT of the neuron-type markers was positive, indicating that the rNS cells were differentiated into different neuron subtypes. The ability to separate the cultured cells from the rat brain tissue was preliminarily determined at the above two points. S-cells.3) The rES cell lines of the 2i system were cultured to obtain 10 stable passages of the rES cell line, which was co-cultured for 30 generations and no significant observation was observed. The differentiation of DA5-3rES cells was found to be positive for AP. RT-PCR was used to detect the expression of Oct4, Sox2, Nanog, Rex-1, fgf4, and Eras in DA5-3rES. The results of the cellular immunofluorescent staining show that the DDA5-3rES cells express Oct4, Sox2 and SSEA-1. The results show that the number of the cells with more than 75% of the cells is 42, indicating that the DDA5-3rES cell has the potential of self-renewal and multi-directional differentiation. And the karyotype was normal. (4) in the case of the EB medium containing 10% serum (DM) normally, most of the rES cells had apoptosis or necrosis, only a few of EB (38.37-4.4%) were formed, and the rES was sequentially removed under the conditions of rEFM, CM + 2i and CM under the culture conditions of rEFM, CM + 2i, and CM, respectively. 2 d, 2d and 1d were cultured to form an EB with good morphology and good quality. (5) The expression of rEB in vitro was detected by RT-PCR, and the surface marker genes, Nestin, Sox17, Afp, Flk and Gaata6, were detected by RT-PCR. The primary determination of rEB has a three-phase, three-phase, three-phase, three-dimensional, (6) the differentiation of the in vitro neural stem cells was carried out by using the N2B27 medium, and the neural tube epithelial cells were formed on the left and right of the induction of the 11th day, and the clones were selected for adherent culture to form the rNS cells, and the result of the immunofluorescence of the cells showed that the Nestin, Oli2, P ax6, Sox2 were positive, most of the rNS cells expressed MKi-67 to demonstrate the rNS The expression rate of the surface marker Dcx of the neuron progenitor cells was 0.6%. 7) In vitro differentiation of the rNS by using the rNS cell differentiation medium, the expression of the surface markers Tuj1, GFAP and 04 of the three nerve cell lines is positive, indicating that the rNS can be differentiated into neurons, Astrocytes and oligodendrocytes were further differentiated, and the expression of MAP2, TH and GABA was found to be positive for neuronal subtype markers, indicating that this rNS had In vitro, the differentiation of DA5-3rES into neural stem cells in vitro
【学位授予单位】:东北农业大学
【学位级别】:博士
【学位授予年份】:2012
【分类号】:R329
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