長鏈非編碼RNA H19在食管癌發(fā)生發(fā)展中的功能及機制研究
[Abstract]:Background Esophageal cancer is one of the most common malignant tumors in the world and has become one of the leading causes of death worldwide. There are two major pathological types of epithelial esophageal cancer: esophageal squamous cell carcinoma and esophageal adenocarcinoma. Although the diagnosis and treatment of esophageal cancer have made great progress, the prognosis of esophageal cancer is still poor, and the overall 5-year survival rate is still at a low level. Effective tumor markers and potential targets for esophageal cancer therapy have become the main directions of basic and clinical research. Only less than 2% of human genome sequences are encoded by proteins. Although other sequences do not encode proteins, more than 90% of them can be transcribed into RNA. Coded RNA. Non-coding RNA participates in many biological processes and plays an important role in tumorigenesis and development. Long chain non coding RNA regulates gene expression at various levels (epigenetic level, transcriptional level and post transcriptional regulation level). A large number of evidence shows that a variety of long-chain non coding RNA have abnormal expression in many kinds of tumors, and play a role in promoting cancer or inhibiting cancer in the process of tumor occurrence and development..HOX transcription RNA (HOTAIR) is the key point of tumor research. In recent years, more and more studies have shown that the abnormal expression of long-stranded non-coding RNA is closely related to the occurrence, development, invasion and metastasis of tumors. Therefore, to explore long-stranded non-coding RNA and protein-coding genes related to tumors. Long-stranded noncoding RNA H19, as a noncoding transcript product of imprinted genes, has no ability to encode proteins because of its paternally imprinted maternal allele expression. H19 has been shown to be highly expressed and has proto-oncogenic activity. However, some studies have suggested that H19 can inhibit the malignant proliferation, invasion, metastasis and neovascularization of tumors. Objective The biological function and pathological mechanism of long-chain non-coding rnah19 in esophageal cancer are still unclear. This study was designed to explore the role of H19 in the occurrence, development and molecular mechanism of esophageal cancer. Materials and Methods 1. The tissue specimens of 64 patients with esophageal cancer who underwent tumor resection in our department from 2007 to 2012 were collected and QR was used. T-pcr was used to quantitatively detect the expression of H19 in 64 esophageal cancer tissues and corresponding normal esophageal tissues, and to analyze the correlation between the expression of H19 and the clinicopathological parameters of patients. 2. the expression of H19 in normal esophageal epithelial cell lines het-1a and esophageal cancer cell lines ec109, ec9706, kyse150 and KYSE450 was detected by qrt-pcr. 3. Silencing the expression of H19 in esophageal cancer cell lines Ec109 and EC9706 by siRNA interference technique, and through CCK-8 method, cell cycle test, in situ tumorigenesis test in nude mice, Transwell cell migration and invasion test The effects of H19 silencing on the expression of MMP-9 protein in EMT epithelial marker e-cadherin, interstitial marker vimentin and its MMPs family were analyzed by Western blot. results 1. The expression of H19 may play an important role in the occurrence and development of esophageal cancer. The expression of H19 is significantly related to the depth of tumor invasion and lymph node metastasis, and is not related to age, sex and tumor differentiation. 2. The detection of H19 in four esophageal cancer cell lines and normal epithelial cell lines confirmed that H19 is present. Esophageal cancer cell lines Ec109 and EC9706 were significantly higher than normal esophageal epithelial cell lines. The proliferation of esophageal cancer cells was significantly inhibited. The g0/g1 phase arrest of esophageal cancer cell lines was detected by flow cytometry. In order to further explore the effect of H19 on the growth of esophageal cancer cells in vivo, we used H19 to interfere with EC9706 cell line and negative control group to carry out subcutaneous tumorigenesis test in nude mice. Subcutaneous tumorigenesis was significantly inhibited, and the tumor volume and weight were significantly lower than those in the negative control group. We further studied the migration and invasion of h19-interfering cell lines Ec109 and EC9706 by Transwell chamber. The results showed that h19-interfering cell lines migration and invasion were significantly inhibited. The results of blot showed that after inhibiting the expression of H19, the expression of E-cadherin, the epithelial markers, and the expression of vimentin and MMP-9 were down-regulated in esophageal cancer cells. As an oncogene promoting tumor cell growth and metastasis, long-stranded non-coding RNA H19 may play an important role in the regulation of metastasis of esophageal cancer and may be a potential therapeutic factor for esophageal cancer. Subtarget.
【學位授予單位】:第三軍醫(yī)大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:R735.1
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