Sox-3在食管鱗癌淋巴轉(zhuǎn)移中的作用及機制研究
[Abstract]:BACKGROUND & OBJECTIVE Among the most common malignant tumors in the world, esophageal cancer ranks eighth in incidence and sixth in mortality. Over the past 40 years, the 5-year survival rate of esophageal cancer has slowly increased, but is still lower than 19% with the improvement of diagnosis, surgery, radiotherapy and chemotherapy. There are two major pathological types of esophageal cancer: adenocarcinoma and carcinoma of the esophagus. Esophageal squamous cell carcinoma is one of the most common esophageal cancers in the world. Esophageal squamous cell carcinoma accounts for 95% of all esophageal cancers in China. It is the third most common malignancy and the fourth leading cause of death in China. Compared with adenocarcinoma, esophageal squamous cell carcinoma has a worse prognosis, and its 10-year survival rate after radical surgery has long hovered around 20%. One of the most important prognostic factors of esophageal squamous cell carcinoma is the state of lymph node metastasis, which determines the stage, treatment and prognosis of esophageal squamous cell carcinoma. Subgroup B1 of the protein family regulates the development and differentiation of neural cells in early embryonic development of vertebrates and gradually decreases their expression during development. Recent studies have shown that Sox-3 is a proto-oncogene and may be associated with the development of tumors. In our previous studies, we found that the expression of Sox-3 in esophageal squamous cell carcinoma tissue and regional lymph nodes. The expression of Sox-3 may promote lymph node metastasis of esophageal squamous cell carcinoma and affect the prognosis of the patients. There is evidence that the density of tumor-associated lymphatic vessels is associated with lymph node metastasis and prognosis in patients with esophageal squamous cell carcinoma. The high expression of VEGF-C or VEGF-D is associated with the depth of tumor invasion, tumor stage, density of tumor lymphatic vessels, lymphatic invasion and lymph node metastasis. In conclusion, we speculate that the expression of Sox-3 may promote lymph node metastasis in esophageal squamous cell carcinoma. In order to elucidate the role of Sox-3 in lymphatic metastasis of esophageal squamous cell carcinoma and its possible mechanism, we used human esophageal squamous cell carcinoma cell models with different levels of Sox-3 expression to select Western blot, RT-PCR, ELISA in vitro and in vivo. To explore the role of Sox-3 in the occurrence, development and lymph node metastasis of esophageal squamous cell carcinoma (ESCC) and its possible mechanism by immunohistochemical methods, and to provide a new direction for the diagnosis and targeted therapy of ESCC with lymph node metastasis. Methods 1. Using the different expression levels of Sox-3 in our laboratory, we constructed a cell model of ESCC. Western blot and Q RT-PCR confirmed the differential expression of Sox-3 in human esophageal squamous cell carcinoma TE-10 cells. The expression of Sox-3 in vitro was examined by cell culture, MTT proliferation, flow cytometry, scratch test, Transwell invasion test and conditioned medium lymphatic endothelial cell tube formation test, especially induction of proliferation, apoptosis, invasion, migration of human esophageal squamous cell carcinoma TE-10 cells. To study the effect of Sox-3 on the development and lymphatic metastasis of esophageal squamous cell carcinoma (ESCC). The effect of Sox-3 on lymph node metastasis of esophageal squamous cell carcinoma was further studied by Western blot and ELISA. The effect of inhibition of Sox-3 expression on the expression and secretion of VEGF-C/D in TE-10 cells was investigated. In the lymphatic endothelial cell tube formation experiment, anti-VEGFR-3 antibody SAR131675 was added to block the function of lymphatic endothelial cells in order to study the possible mechanism of VEGF-C/D pathway in promoting lymph node metastasis of esophageal squamous cell carcinoma. 1. Western blot assay and Q RT-PCR assay confirmed that the human esophageal squamous cell carcinoma cell models with different expression of Sox-3 were successfully constructed by TE-10 cells infected with Sox-3 Si RNA lentivirus. The expression of Sox-3 in TE-10 cells of control group and TE-10 cells of no-load group were similar, which were significantly higher than that of TE-10 cells of interference group. MTT, flow cytometry, scratch test, tra. Nswell test and conditioned medium lymphatic endothelial cell tubing test confirmed that Sox-3 can significantly promote the proliferation, invasion, migration and lymphatic endothelial cell tubing ability of human esophageal squamous cell carcinoma cells, but inhibit cell apoptosis. 2. Successful construction of nude mice transplantation tumor model, the results showed that: compared with the low expression of Sox-3 interfering group, The growth rate and tumor size of the transplanted tumor were similar in the no-load group with high expression of Sox-3, but the volume of axillary lymph nodes on the ipsilateral side of the transplanted tumor was significantly increased. The results of Western blot and ELISA showed that inhibiting the expression of Sox-3 in TE-10 cells could promote the lymph node metastasis of esophageal squamous cell carcinoma. The expression and secretion of VEGF-C and VEGF-D were significantly decreased in the lymphatic endothelial cells. In the lymphatic vessel endothelial cells tube-forming experiment, the number of tubes of TE-10 cells in each group was significantly decreased after blocking the function of VEGF R-3 by SAR131675, and there was no difference between groups. Lymphangiogenesis is achieved through the VEGF-C/VEGF-D/VEGFR-3 pathway. Conclusion 1. Sox-3 can significantly promote the proliferation, invasion and migration of human esophageal squamous cell carcinoma cells in vitro, and inhibit cell apoptosis, but in vivo Sox-3 has little effect on the tumor formation rate and size of esophageal squamous cell carcinoma cells. 2. Sox-3 can significantly enhance the fineness of human esophageal squamous cell carcinoma cells in vitro. Sox-3 can promote lymphatic metastasis of esophageal squamous cell carcinoma cells after tumor formation. 3. Sox-3 can up-regulate the expression and secretion of VEGF-C and VEGF-D in esophageal squamous cell carcinoma cells. It acts on lymphatic endothelial cells and promotes lymphatic angiogenesis through the VEGF-C/VEGF-D/VEGFR-3 pathway. Possible mechanisms of lymph node metastasis in esophageal squamous cell carcinoma.
【學(xué)位授予單位】:第三軍醫(yī)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:R735.1
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