MBNL3及其誘導的可變剪接轉錄本POLDIP3-β在肝癌中的作用及機制研究
[Abstract]:Variable splicing (alternative splicing,AS) plays an important role in many physiological and pathological processes, and splicing imbalance is one of the important characteristics of tumorigenesis. We know that different products from the same gene may have different effects on tumors. Therefore, a further study on the role of variable splicing factors and splicing events in tumorigenesis can provide some new ideas for tumor targeting therapy. In our study, we found a splicing factor, MBNL3, which has carcinoembryonic properties and promotes the development of liver cancer. First, we detected the expression of MBNL3 in fetal liver and adult liver tissue, and found that MBNL3 was highly expressed in fetal liver tissue. Then, the expression of MBNL3 was detected in liver cancer and adjacent liver tissues, and its correlation with clinicopathological features was analyzed. It was found that the high expression of MBNL3 in HCC tissues and the poor prognosis of HCC patients may drive the development of tumor. Further studies revealed that stem cell transcription factor OCT4,SOX2,NANOG up-regulated the expression of MBNL3. MBNL3,CCK-8, was overexpressed in hepatoma cells and hepatocytes. The proliferative tests such as Tunel, detection of apoptotic marker factors, and tumor-bearing experiments in vivo, such as (EdU) staining and clone formation, were detected in hepatoma cells and hepatocytes. The results showed that MBNL3 could promote the proliferation of hepatoma cells and untransformed hepatocytes, inhibit their apoptosis, and promote tumor growth in vivo. Knockout MBNL3 inhibited the proliferation of hepatoma cells and promoted their apoptosis. Finally, we studied the role of knockout MBNL3, in tumorigenesis in various hepatoma cell lines and hepatocyte lines with different MBNL3 background expression. It was found that knockout MBNL3 could significantly inhibit the growth of hepatoma cells in vitro and in vivo, and had a stronger effect on cell lines with high MBNL3 expression. In view of the strong biological function of MBNL3, we analyze its downstream molecules. The results of transcriptome sequencing show that MBNL3 can regulate the variable splicing of POLDIP3. Therefore, we anchor the different transcripts of POLDIP3 to study. POLDIP3 is the target of ribosomal protein S6 kinase 1, which can regulate the replication of DNA and the translation of mRNA. In this study, we found that POLDIP3 has two transcripts of POLDIP3- 偽 and POLDIP3- 尾, in which POLDIP3- 偽 contains exon 3, POLDIP3- 尾, and then lacks 29 amino acids. By detecting the expression of POLDIP3- 偽 and POLDIP3- 尾 in clinical and para-cancerous liver tissues, we found that POLDIP3- 尾 was significantly up-regulated in HCC tissues compared with paracarcinomatous liver tissues. The effects of two transcripts of POLDIP3 on the proliferation of hepatocellular carcinoma cells were detected by Glo cell viability assay and clone formation assay. To study the role of POLDIP3 two transcripts in the apoptosis of hepatoma cells, and to detect the effect of POLDIP3 two transcripts on the migration of HCC cells by transwell assay and scratch test. The results of functional experiments in vitro showed that POLDIP3- 尾 could significantly promote the proliferation of hepatoma cells, inhibit the apoptosis of hepatoma cells, and accelerate the migration of hepatoma cells. However, POLDIP3- 偽 has a relatively weak effect on the proliferation, apoptosis and metastasis of hepatoma cells. Finally, the effect of POLDIP3- 尾 on tumor in vivo was detected in animals. It was found that POLDIP3- 尾 could significantly promote the growth of hepatoma cells in vivo. The above data suggest that POLDIP3- 尾 is up-regulated in HCC and plays an oncogene role in HCC. Selective targeting inhibition of POLDIP3- 尾 is expected to be a new therapeutic strategy for HCC. Our study revealed the relationship between the variable splicing factor, the variable splicing event and the tumorigenesis. At the same time, we established that the variable splicing factor and the variable splicing event can be used as potential therapeutic targets.
【學位授予單位】:第二軍醫(yī)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R735.7
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