NRAGE蛋白的亞細(xì)胞定位及其功能研究進(jìn)展
[Abstract]:Background & objective: NRAGE (neurotrophin receptor p75-interacting MAGE homolog) gene is a member of MAGE family of melanoma associated antigens. It has been found that NRAGE is involved in apoptosis, cell cycle regulation and tumorigenesis. In the first part, we found that there was a high distribution of NRAGE protein in the nucleus of human cervical cancer HELA cells, but the recent studies on NRAGE protein were based on NRAGE as a cytoplasmic protein. So we designed the experiment to discuss the following problems: the differential localization analysis of 1.NRAGE protein in normal cells and cancer cells, the analysis of nuclear localization mechanism of 2.NRAGE protein, and the analysis of nuclear localization mechanism of 2.NRAGE protein. 3. Nuclear localization of NRAGE protein functional analysis. The second part of the pre-experiment found that NRAGE protein and lysosomal associated membrane protein LAMP2 co-localization, according to the experiment speculated that NRAGE protein may participate in some functions of lysosome, so this paper designed experimental analysis: 1.NRAGE protein involved in the process of autophagy; 2.NRAGE protein is involved in autophagy and associated with aging and inflammation. Methods: immunofluorescence was used to detect the localization of NRAGE protein in some normal cells and cancer cells. Subclone was constructed to analyze the nuclear localization mechanism of NRAGE protein. The function of NRAGE protein was analyzed by hydrogen peroxide stimulation experiment. D-HANKS medium starvation culture, m IFN-r stimulation culture, chloroquine stimulation culture were used to detect whether NRAGE protein was involved in autophagy, 尾 -galactosidase senescence was used to detect the senescence of NRAGE gene wild type and knockout type mouse fibroblasts. Q-PCR was used to detect the expression of inflammatory factors in murine peritoneal macrophages stimulated by LPS and cultured in wild type and knockout type of NRAGE gene. Results: NRAGE protein was mainly localized in the cytoplasm of HEK-293 cells, C2C12 cells, HSF cells and MSC cells in normal cells, but in the nucleus of NRAGE protein in HELA cells, HepG2 cells, MDA-MB-231 cells and MCF-7 cells of cancer cells. All of the constructed NRAGE (920aaanhuo 834aaf324aa) plasmids were located in the cytoplasm, the expression of NRAGE protein was increased under the hydrogen peroxide concentration gradient, and the expression of NRAGE gene knockout mouse fibroblasts was higher than that of wild-type fibroblasts under both background and stimulation conditions. The senescence of fibroblasts of NRAGE knockout type was higher than that of wild type, and the peritoneal macrophages of NRAGE knockout type were more sensitive to inflammatory stimulation. Conclusion: the nuclear localization of NRAGE protein in cancer cells may be caused by the selective splicing of genes, and the nuclear protein subtype of NRAGE may be involved in the repair process after cell injury. It is further speculated that the nucleoprotein subtype of NRAGE may be related to tumor. NRAGE protein is involved in the process of lysosomal autophagy, which may lead to autophagy promoting aging. The process of autophagy may be associated with inflammation.
【學(xué)位授予單位】:南京師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:R329.2
【共引文獻(xiàn)】
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