骨髓间充质干细胞向神经样细胞分化过程的可塑性研究
[Abstract]:The recovery of nerve function after the central nervous system (CNS) injury is very difficult. The main reason is that the regeneration ability of neurons in the brain is very poor. The bone marrow mesenchymal stem cells (bone marrowmesenchymal stem cells, BMSCs) can be obtained in autologous and can be stabilized in vitro, and can be induced to differentiate into nerve cells. For the treatment of nervous system diseases, the basic medical research related to the differentiation of bone marrow mesenchymal stem cells into nerve cells is very important.
A large number of in vitro and in vivo experimental studies have shown that BMSCs can be differentiated into neural cells, which have a certain repair effect on the damage of the nervous system. Neural like cells differentiated from bone marrow mesenchymal stem cells express the markers of neurons and their precursor cells, but can they develop into mature neurons and demonstrate their function. There are great differences, and the molecular mechanism of BMSCs differentiating into neuron like cells is unknown.
In this work, the primary culture system of neonatal rat cerebral cortex cells was established. The serum-free medium after culture of 2 D was obtained as the conditioned medium to induce bone marrow mesenchymal stem cells to differentiate into neurolike cells. After induction and culture of 24 h, the neuron like cells differentiated from BMSCs had typical morphological characteristics of neurons, with the use of God. The phenotype of the nerve like cells was identified by cell and BMSCs markers, and the results were as follows: Nestin (15.07% + 1.86%), beta - -Tubulin (46.29% + 2.58%), GFAP (9.54% + 1.42%), NCAM (49.82% + 3.46%), CD106 (96.86% + 1.82%), CD90 (33.62% + 2.48%), CD44 (32.44% + 46.29%), CD29 (1.42%), and CD71, CD71, type III beta microtubule Protein (beta - III -Tubulin) is considered as an early marker of neuron, and neuron specific enolase (NSE) is widely regarded as one of the markers of mature neurons. The results show that the high proportion of neurolike cells express beta - III -Tubulin and does not express NSE. It suggests that neurolike cells derived from BMSCs are being differentiated from BMSCs into mature neurons. The results also showed that neurolike cells also expressed positive expression of CD106, CD90, CD44, CD29, and did not express CD45, CD71, CD34, indicating that the neuron like cells differentiated from BMSCs still had the phenotypic characteristics of BMSCs, and suggested that they were in the transition state of nerve differentiation.
This work also uses the basic fibroblast growth factor (bFGF), two methyl sulfoxide (dimethyl sulphoxide, DMSO), the traditional method of Ding Qiangji anisole (butyl hydroxy ANISOL, BHA) to induce the differentiation of neural like cells to the nerve like cells. Characteristics of typical neuronal morphology. Neural cells were identified by nerve cells and BMSCs markers. The results were: Nestin (21.12% + 2.28%), beta - -Tubulin (78.26% + 3.52%), NCAM (79.86% + 2.88%), NSE (70.82% + 2.46%), CD106 (96.88% + 2.75%), CD29 (64.94% + 2.16%), and CD90, CD44, CD45, CD71. The neurolike cells have both phenotypic characteristics of the nerve cells and some of the phenotypic characteristics of BMSCs. These results also suggest that the neurolike cells derived from the traditional chemical induction method are in the transition state of the differentiation of the mature neurons from the BMSCs to the mature neurons of the BMSCs.
This work uses these two methods to induce BMSCs to differentiate into neuron like cells, and then continue to cultivate nerve like cells with 24 h with the normal medium containing 10% serum, and find a common phenomenon: nerve like cells return to the morphology of BMSCs. Immunofluorescence identification with nerve cells and BMSCs markers, phenotypic identification results and BMSCs The phenotypic characteristics are similar. Then the identification of neuron like cells differentiated from BMSCs to whether cells with BMSCs characteristics have multiple differentiation potential, the results show that the cells still have multiple differentiation potential, showing the ability to differentiate into neurogenic, osteogenic and adipose tissue.
The real mature neurons are neural terminal differentiated cells, which are difficult to reverse to stem cells. It shows that the neuron like cells in this study are different from the real neurons. They may be in the transition state of BMSCs to mature neurons, and can still be reversed to BMSCs.. The process of cell differentiation to neurolike cells is plastic. The results obtained in this study provide some reference for the future use of bone marrow mesenchymal stem cells in the treatment of nervous system diseases, and provide some experimental basis for the basic research on differentiation of bone marrow mesenchymal stem cells to neurolike cells.
【学位授予单位】:苏州大学
【学位级别】:硕士
【学位授予年份】:2008
【分类号】:R329
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