MiR-22對小細胞肺癌放療敏感性的影響及相關機制研究
[Abstract]:In recent years, the incidence and mortality of lung cancer have risen rapidly, which is a serious threat to the health of human life. The small-cell lung cancer accounts for 20% of the lung cancer, the malignant degree of the small-cell lung cancer is high, the growth is rapid, the transfer is fast, the chemotherapy and the radiotherapy are sensitive, the initial treatment response rate is high, the secondary drug resistance and the radiotherapy resistance are easy to occur, and the prognosis is poor. With the rapid development of stereotactic radiosurgery, radiotherapy equipment and technology, radiation therapy provides a very effective means of treatment for patients with lung cancer. However, the tumor cells tend to produce different degrees of radiation resistance in the middle and later stages of radiation therapy, thus reducing the expected therapeutic effect of radiation therapy. Mi-RNA is an endogenous non-coding small-molecule RNA, plays an important role in the formation, proliferation, apoptosis, chemotherapy resistance and radiotherapy resistance of the tumor, and therefore, the research of miRNA is of great significance to the diagnosis and treatment of the tumor. MiRNA-22 is a tumor suppressor, and the high expression of miRNA-22 can significantly inhibit the proliferation and invasion of tumor cells. The purpose of this study was to explore the effect of mi R-22 on the sensitivity of NCI-H446 radiotherapy for small cell lung cancer cell lines, and to further explore relevant molecular mechanisms to provide a new way to improve the therapeutic effect of small cell lung cancer. The main contents of this study are as follows:1. RT-qPCR is used to detect the mRNA expression level of miR-22 in human normal lung epithelial cell line (BEAS-2B) and small-cell lung cancer cell line (NCI-H446). The results showed that the expression of miR-22 in small cell lung cancer cell line NCI-H446 was significantly decreased. The miR-22 mimetics and its control (nc) were used to transiently transfect the small cell lung cancer cell line NCI-H446 to establish a miR-22 overexpression cell line. Small cell lung cancer cell line NCI-H446 was transiently transfected with the mi R-22 inhibitor and its controls, and a cell line with a low mi R-22 was established. The expression plasmid of miR-22 was constructed by selection of vector pLKO.1, and the recombinant plasmid and its no-load plasmid were transfected into small-cell lung cancer cell line NCI-H446, respectively, and the expression of miR-22 was established. The positive cell line was detected by RT-qPCR. The results showed that the expression of miR-22 and the knockdown of the cell line and the expression of miR-22 were successful. The effects of miR-22 on the proliferation of small-cell lung cancer cells were detected by MTS assay, colony formation assay and Ki-67 antibody. The results showed that the expression of miR-22 significantly inhibited the proliferation of the cells under different doses of X-ray, and the knockdown of miR-22 significantly promoted the cell proliferation, and the trend of the increase of the irradiation dose was more obvious. The effect of miR-22 on the apoptosis of small cell lung cancer cells was detected by using the APC Annexin V/ PI double staining method. The results show that the overexpression of miR-22 can promote the apoptosis of cells. It was found that miR-22 had little effect on the cycle of NCI-H446 in small-cell lung cancer cells by using propidium iodide (PI) and cell cycle experiment by flow cytometry. Using the scratch test to detect cell migration, it was found that the overexpression of miR-22 could significantly inhibit the migration of small-cell lung cancer cells NCI-H446. The target gene of miR-22 was predicted by Bioinformatics database Target Scan and Pictar, and a common predicted target gene was found, and a gene WRNIP1 associated with DNA damage repair was selected by NCBI search and literature search. The targeting relationship between WRNIP1 and mi R-22 was verified by RT-qPCR, Western blot and double-luciferase reporter gene. The results show that WRNIP1 is a direct target gene of miR-22, and miR-22 has a negative control effect on WRNIP1. A high-throughput transcriptome sequencing was performed on a stable and no-load control of miR-22 overexpression to find differential expression genes associated with cell proliferation, migration and apoptosis (KLK8, PC, SCUBE1, STC1, and GM6A) for RT-qPCR validation. The results showed that the expression of KLK8 was down-regulated in the expression of miR-22 and the expression of KLK8 was up-regulated and the expression of KLK8 was up-regulated. Therefore, it is presumed that miR-22 inhibits the proliferation and migration of NCI-H446 cells and may be related to KLK8, PC and SCUBE1 genes, and miR-22 promotes the apoptosis of NCI-H446 cells, which may be related to the STC1 and GM6A genes. The molecular mechanism of the sensitivity of miR-22 to the radiotherapy sensitivity of small cell lung cancer is explained.
【學位授予單位】:天津醫(yī)科大學
【學位級別】:博士
【學位授予年份】:2017
【分類號】:R734.2
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