NEK9異常表達(dá)在乳腺癌發(fā)生發(fā)展中的作用研究
[Abstract]:Objective: Breast cancer is a common malignant tumor of women. In recent years, the incidence of breast cancer has increased year by year. Surgical removal and postoperative chemotherapy and endocrine therapy are the main methods of the treatment of breast cancer. In recent years, the molecular mechanism of breast cancer has made great progress in the research and treatment, but the breast cancer still seriously harms the life and quality of life of the female, in which the local diffusion of the tumor, the metastasis of the lymph node and the metastasis of distant organs are the main causes of the prognosis and the limited survival rate of the patients. To study the molecular pathogenesis of breast cancer, to explore the mechanism of invasion and metastasis, to find a new anti-cancer strategy, to provide new targeted therapy for patients with breast cancer, especially those who lack effective treatment, and to effectively improve the prognosis and survival rate of the patients. Nek9 is one of the Nek family members, and Nek9 plays an important role in the process of cell cycle such as the replication, separation and spindle formation of the central granule. The abnormal expression of Nek9 can also cause the abnormal division of the cytoplasm and the error separation of the homologous chromosomes. So far, the related research on Nek9, in particular its role in the tumor. Objective To study the expression of Nek9 in breast cancer and common benign breast diseases, and to study the role of Nek9 in the development of breast cancer. Methods: The specimens of breast cancer and common benign breast lesions were collected and the relevant clinical and pathological data were improved. The expression of NEK9 protein in invasive breast cancer and normal breast tissue, breast hyperplasia, fibroadenoma and intraductal carcinoma was detected by immunohistochemistry. The relationship between the expression level of NEK9 and the clinical pathological index was analyzed. The siRNA and the plasmid containing Nek9 were transiently transfected into the human breast cancer MCF-7 cell line of the hormone receptor, and the plasmid containing Nek9 was transfected into the three-negative breast cancer cell line MDA-MB-468, and the interference efficiency and the overexpression efficiency of the Nek9 were detected by Western blot. The effects of Nek9 on cell cycle and cell apoptosis were measured by flow cytometry. Results: In 316 cases of invasive ductal carcinoma, the expression of NEK9 was significantly related to the histological grade (p0.01), tumor size (p = 0.0087), HER-2 amplification (p = 0. 0016), p53 mutation (p0. 000l), ki67 high expression (p = 0.0020), negative correlation with ER and PR expression and statistical significance (p0.01); The decrease or deletion of NEK9 in three-negative breast cancer was significantly higher than that of other molecular subtypes (p0.01). In the case of hormone receptor-positive breast cancer, the expression of NE9 in the ductal carcinoma, invasive carcinoma and axillary lymph node metastasis was decreased in turn (p0.01), but there was no difference in the expression of NEK9 between the intraductal carcinoma and the mammary gland hyperplasia. In vitro experiments, it is confirmed that the silence Nek9 can promote cell proliferation, migration and infiltration, inhibit the apoptosis, and at the same time lead to the increase of the tumor cells in the G2 and M phase, and the same, the plasmid of the Nek9 is transiently transfected into the breast cancer cell line, the migration and infiltration capacity of the cells is inhibited, The cell proliferation ability is decreased, the cell apoptosis is promoted, and the cells in the G2 and M phase are reduced and the cell cycle process is affected. Conclusion: 1. In the breast invasive ductal carcinoma, the expression of NEK9 was negatively correlated with the tumor size, the histological grade, HER-2 amplification, the abnormal p53 function and the high proliferation index, which was positively correlated with the expression level of ER and PR. The cell experiment also revealed that the closure of Nek9 promoted the growth of three-negative breast cancer cells, Nek9, or the onset of three-negative breast cancer. In the same case, the expression of NEK9 was gradually decreased from the intraductal carcinoma to the invasive ductal carcinoma to the axillary lymph node metastasis, and the in vitro experiment also confirmed that the interference with Nek9 could promote the migration and infiltration of breast cancer cells, It is suggested that Nek9 plays an important role in the invasion and metastasis of breast cancer. 5. NEK9 is expected to be a new biomarker to help discover new molecular subtypes of breast cancer and provide a new basis for the diagnosis, treatment and prognosis of breast cancer.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:R737.9
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