細(xì)胞周期調(diào)控蛋白Nip在DNA損傷修復(fù)中的生物學(xué)功能和分子機(jī)制研究
[Abstract]:Under normal circumstances, many harmful factors in the environment, including ionizing radiation (ionizing radiation, IR), ultraviolet irradiation of (ultraviolet irradiation, UV) and chemical carcinogens, may lead to cell DNA damage. As organisms evolve, the biological world produces a variety of DNA repair pathways. For example, base excision repair (base excision repair, BER), nucleotide excision repair (nucleotide excision repair, NER), homologous recombination (homologous recombination, HR) and non-homologous terminal junction (no n-ho mo logo us end joining, NHEJ), etc.) DNA damage repair is essential to maintain genomic integrity. DNA repair abnormality Which is likely to lead to genomic instability and malignant cell transformation. This in turn leads to tumorigenesis. The long-term in-depth study of DNA repair provides a large number of evidences for clinical tumor treatment. The mechanism of DNA repair is complex and diverse. Centrosomal protein N1p (ninein-like protein) is a protein related to BRCA1 obtained by yeast two-hybrid experiment in our laboratory. Many studies have shown that Nlp is involved in many biological processes, such as microtubule formation, spindle formation, centrosomal maturation and cytokinesis. Although Nlp plays an important regulatory role in cell cycle, it is necessary for mitosis. But its other functions are unclear. In our earlier work, we found that the localization of Nlp in lung cancer cell line H1299 was significantly changed after irradiation with UV. This suggests that our Nlp may be involved in the DNA damage response induced by UV. In order to verify this hypothesis, we found that Nlp can promote the activity of nucleotide excision repair (nucleotide excision repair, NER) pathway through the detection of (HCR) and CPDs removal rate of the host cell reactivation reaction. In order to further study the function of Nlp, we used two kinds of cell lines, Nlp transgenic mice, control mice, MEF and newborn mice skin, respectively, to observe the cell activity, clone formation, flow rate apoptosis and in situ apoptosis after UV irradiation. It was found that Nlp could protect cells from apoptosis induced by ultraviolet radiation. In order to explore its mechanism, we found that Nlp was located on the site of DNA damage after UV irradiation by means of local UV irradiation. Then, by means of nuclear protein extraction, western blotting,co-IP,GST pull-down and other methods, it was found that UV irradiation could induce the translocation of Nlp into the nucleus. The nucleation of Nlp was regulated by NPM1, and the C terminal of Nlp (1030-1382) mediated its interaction with NPM1 and its nuclear entry. In addition, Nlp can interact with XPA and ERCC1, and promote the combination of them, thus promoting the function of DNA damage repair. In addition, in view of the clear correlation between UV radiation and the occurrence of human skin cancer, we found that the expression of Nlp protein in human skin cancer samples was significantly lower than that in the normal control group by immunohistochemical method. This suggests that abnormal Nlp expression may be involved in the occurrence and development of human skin cancer. To sum up, this study has found and proved that the cell cycle regulatory protein Nlp is a new and important member of nucleotide excision repair (NER) pathway, thus providing a new understanding of the regulation mechanism of nucleotide excision repair pathway. It provides a new idea for the treatment of tumor.
【學(xué)位授予單位】:北京協(xié)和醫(yī)學(xué)院
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:R730.5
【共引文獻(xiàn)】
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