干性基因Nanog在膀胱癌干細(xì)胞干性維持中的作用研究
[Abstract]:Bladder cancer is a malignant tumor with the highest incidence in male genitourinary system in China, which has the characteristics of tolerance to radiotherapy and chemotherapy and easy recurrence after treatment. Therefore, we need to find a new treatment strategy for bladder cancer. The successive discovery of tumor stem cells in many kinds of tumors provides a new research perspective for us to study the genesis, development and treatment of bladder tumors. Studies have shown that tumor stem cells have the potential of self-renewal and multi-directional differentiation, in which tumor stem cells can form progeny cells which are identical to the nature and function of mother cells by symmetrical division and asymmetric division, and maintain their self-renewal. Mutations in tumor stem cells can be transferred from generation to generation through self-renewal to maintain the tumorigenicity of tumor stem cells. This suggests that self-renewal is one of the important reasons why tumor stem cells are tumorigenic. Stem cell self-renewal is regulated by many ways, and stem genes play an important role in its self-renewal, including transcription factors such as Oct4,Sox2 and Nanog, which regulate the balance of cell proliferation and differentiation by activating transcription of some key genes. Maintain the undifferentiated state of stem cells. Among them, Nanog is recently identified as a key transcription factor for maintaining pluripotency and self-renewal of undifferentiated embryonic cells. Its high expression in a variety of tumors can enhance the proliferation of tumor cells, and often accompanied by poor prognosis. These results suggest that Nanog can promote tumor development by maintaining the self-renewal ability of tumor stem cells. In the study of bladder cancer stem cells, bladder cancer stem cells also have a strong ability of self-renewal, and with the increase of Nanog expression, it is suggested that Nanog may be involved in the dry maintenance of bladder cancer stem cells. At present, the role of Nanog in the carcinogenesis and development of bladder cancer remains unclear. In order to study the role of Nanog in the dry maintenance of bladder cancer stem cells, We first detected the expression of Nanog protein in bladder cancer stem cells and 46 cases of bladder cancer by Western Blot and immunohistochemistry. We found that Nanog was highly expressed in stem cells and tissues of bladder cancer, and its expression was positively correlated with the pathological grade of bladder cancer. In order to investigate the role of Nanog in bladder cancer cells, we constructed bladder cancer T24 and 5637 cell lines with stable and high expression of exogenous Nanog using lentiviral vector. Furthermore, the effect of Nanog on the proliferation of bladder cancer cells was observed by plate cloning assay, and the effect of Nanog on the self-renewal ability of bladder cancer cells was detected by suspension globulation technique. The chemotherapeutic drug cisplatin was selected. Clone formation test and MTT method were used to detect the effect of Nanog on the drug resistance of bladder cancer cells, and the role of Nanog in the tumorigenicity of bladder cancer cells was analyzed by using nude mice transplantation tumor model. The clone formation rate of T24 and 5637 cells with high expression of Nanog increased, the ability of suspension spheroidization increased, the sensitivity to cisplatin decreased, and the tumorigenicity of T24 and 5637 cells increased in vivo. In this study, we first reported the expression of Nanog in the carcinogenesis and development of bladder cancer, and discussed the relationship between Nanog and dry maintenance of bladder cancer stem cells from the point of view of the characteristics of tumor stem cells. It was found that Nanog could affect the proliferation and self-renewal of bladder cancer cells. Drug resistance and tumorigenicity promote the dry maintenance of bladder cancer stem cells. It lays a foundation for elucidating the relationship between Nanog gene and carcinogenesis and development of bladder cancer, as well as the mechanism of recurrence and drug resistance of bladder cancer. It is also suggested that Nanog can be used as a new marker of bladder cancer stem cells in clinical practice. It can be used as a new target for early diagnosis and individualized treatment of bladder cancer, and provide a new idea for the diagnosis and treatment of bladder cancer.
【學(xué)位授予單位】:第三軍醫(yī)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:R737.14
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