RHBDD1在結(jié)直腸癌中的功能研究
[Abstract]:Colorectal cancer is one of the most common cancers in the world and one of the most fatal cancers. When patients are diagnosed with colorectal cancer, about 1/4 of the patients have undergone metastasis in the body, and most of the colorectal cancer patients eventually develop to metastatic cancer. The 5 year survival rate of metastatic colorectal cancer is low and the mortality rate is high. Previous studies on the occurrence of colorectal cancer, especially the molecular mechanisms of metastasis, are not very detailed, and the treatment of colorectal cancer has failed to achieve good results. Therefore, the discovery and identification of genes associated with the occurrence and metastasis of colorectal cancer is very important for the study of the molecular mechanisms of the occurrence and metastasis of colorectal cancer. It not only helps us understand and understand colorectal cancer, but also provides a new idea for the treatment of colorectal cancer.Rhomboid domain containing protein 1 (RHBDD1) is a highly expressed new gene found in our early laboratory screening of testicular cDNA library, and first we named the gene HSD50 and submitted to GenBank.. Because it contains the rhomboid domain so that RHBDD1.RHBDD1 is a transmembrane protein, it expresses a full length 315aa and contains 6 transmembrane structures, including the conservative Rhomboid domain, which is one of the members of the Rhomboid family. According to our previous research in the laboratory, RHBDD1 can cut tumour suppressor activate. D pathway-6 (TSAP6), apoptosis precondition protein Bik and transforming growth factor alpha (transforming growth factor alpha, TGF-a). Our laboratory recently found that RHBDD1 has a high protein expression level in colorectal cancer, and it can activate the downstream letter of the epidermal growth factor receptor by cutting TGF-a. The pathway of RHBDD1 plays an important role in the growth of the tumor. Other possible relationships between the RHBDD1 and the EGFR are still not related. This article focuses on the interaction of RHBDD1 and EGFR. We first studied the effect of RHBDD1 on the growth of the tumor. Now, the cell growth and proliferation ability of the cells decreased significantly after RHBDD1 knockout. Then, the tumor volume decreased significantly in the RHBDD1 knockout experimental group, and the subcutaneous swelling of the mice increased significantly after the RHBDD1 knockout cell line. Then, the tumor metastasis was observed by RHBDD1. First of all, we found a significant correlation between RHBDD1 expression positive and distal organ metastasis in patients with recurrent rectal cancer after surgery. Then, the two classics of cell migration and invasion were used to observe cancer metastasis. After RHBDD1 knockout, the migration and invasiveness of colorectal cancer cell lines were significantly reduced. When the tumor cell line was injected into the tail vein of the immunodeficient rat, the metastatic lesion was significantly reduced and the volume of the metastases decreased significantly when RHBDD1 was knocked down or knocked down. The above experiment indicated that RHBDD1 could affect the growth and metastasis of colorectal cancer cells, which may be in the occurrence of colorectal cancer and the occurrence of colorectal cancer. In order to study the specific molecular mechanism of RHBDD1 in the development of colorectal cancer, we verified the interaction between RHBDD1 and EGFR through the Co-immunoprecipitation (CO-IP) experiment, and found that RHBDD1 can interact with EGFR. Further experiments found that RHBDD1 can and Four members of the EGFR family (EGFR, HER2, HER3, and HER4) were interacted with each other. By immunofluorescence (Immunofluorescence, IF), it was found that RHBDD1 and EGFR were Co located in the cells. We detected the EGFR protein expression after the RHBDD1 knockout, and found that the expression of the EGFR protein was significantly reduced and the expression of the RHBDD1 was also expressed. EGFR protein expression decreased after knocking down RHBDD1. The effect of RHBDD1 on the stability of EGFR protein was observed by Actinomycate (cycloheximide, CHX), and the stability of EGFR protein was reduced after RHBDD1 knockout, and the stability of EGFR protein was increased after RHBDD1 resumed. Stimulated by EGF, the EGFR degradation of RHBDD1 knockout cells increased. The same phenomenon was also observed in RHBDD1 knockout cells. The phosphorylation level of p38 protein increased when the downstream EGFR signaling pathway of RHBDD1 knocked low. We further observed the effect of RHBDD1 on EGFR mRNA. We found that EGF after low RHBDD1 EGF. The expression of R mRNA was significantly reduced and the same phenomenon was observed during repeated experiments in the RHBDD1 knockout cells. Then we found that the expression of EGFR protein and c-Jun protein decreased significantly after the RHBDD1 knockout and knockout. The expression of EGFR in the RHBDD1 knockout cells showed a rise in the EGFR expression and a dose-dependent manner. The expression of EGFR mRNA was significantly increased. We also detected a significant decrease in the protein expression of EGFR and c-Jun in the tumor tissues of the subcutaneous tissue of the mice. Then in the tissue specimens of the colorectal cancer patients, the expression of RHBDD1, EGFR and c-Jun was consistent with the protein immunoblotting test. To sum up, RHBDD1 and EGFR interact with each other to play a role in stabilizing EGFR proteins. And RHBDD1 can regulate the expression of EGFR mRNA by regulating c-Jun, thereby affecting the role of EGFR in the development of colorectal cancer.
【學(xué)位授予單位】:北京協(xié)和醫(yī)學(xué)院
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:R735.34
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