SARM在腎癌細(xì)胞中的功能及其分子機(jī)制的初步研究
[Abstract]:Renal cell carcinoma (RCC) is a malignant tumor originating from renal tubular epithelium, accounting for 80% - 90% of renal malignancies. It is one of the common malignant tumors in adult urinary system. About 1/3 of the patients with RCC had metastasis at the time of their first visit and were unable to undergo radical surgery. About 1/3 of the patients with localized RCC still had distant metastasis after radical surgery. For localized RCC patients, radical nephrectomy or nephron-sparing surgery was performed, and about 90% of them had distant metastasis. At the same time, metastatic renal cell carcinoma (mRCC) is insensitive to conventional radiotherapy and chemotherapy, and its 5-year survival rate is less than 10%[4]. In recent years, molecular targeted drug therapy has become a hotspot in tumor therapy, and has made great progress in the treatment of many kinds of tumors. It has become an important part of anti-tumor therapy [5]. Hypoxia-inducible factor (HIF), vascular endothelial growth factor (VEGF) and platelet-derived growth factor (p) have been found in the study. Latlet-derived growth factor (PDGF), epidermal growth factor (EGF) and its receptor (EGFR), mammalian target of rapamycin (mTOR) are all important target molecules for molecular targeted therapy. Abnormal expression of these molecules and the prognosis of renal cell carcinoma, especially clear cell renal cell carcinoma (RCC) are important. The most important molecular signaling pathways in RCC molecular targeted therapy include VEGF pathway and mTOR pathway. Vascular density in tumor tissues was significantly higher than that in normal kidney tissues [6,7]. Vascular growth factor binding to its receptor activates intracellular signal transduction pathways, including PI3K/Akt/mTOR and Ras/Raf/mitogen-activated protein kinase (MAPKK)/extracellular signal-regulated kinase (extrace). Llular signal regulated kinase (ERK) and other signaling pathways promote the proliferation and differentiation of endothelial cells, and thus participate in the growth, proliferation and differentiation of renal cell carcinoma. SARM (Sterile-alpha and HEAT/Armadillo motif containing protein) is a TLR (Toll-like receptor) signaling pathway containing TIR (Toll/interleukin-l receptor) structure. One of the five adaptor proteins of the TLR domain, which is evolutionarily conserved, has similar structure molecules from nematodes, fruit flies, amphioxus to mammals [8]. Answer and inflammatory response play an important role [9-11]; at the same time, some studies have found that SARM can promote the apoptosis of neurons in mice under pressure [12]. However, there are no reports about the role of SARM in tumorigenesis and development. The molecular mechanism of SARM in renal cell carcinoma is still unclear. Therefore, it is very meaningful to study the function and molecular mechanism of SARM in renal cell carcinoma. The results will provide a new target for molecular targeted therapy of renal cell carcinoma. To study the expression of SARM in renal cell carcinoma tissue and renal cell line, normal renal tissue and renal tubular epithelial cells adjacent to cancer, and to explore the role of SARM in the growth of renal cell carcinoma cells and the role of inducing autophagy, and to observe the interaction of molecular targeted drug sunitinib with SARM. In order to clarify the regulation of SARM on the growth of renal cell carcinoma and its possible molecular mechanism, and to provide new targets and new ideas for the research of molecular targeted therapy drugs for renal cell carcinoma. Protein and RNA expression in normal renal tissues and adjacent normal renal tissues, normal renal tubular epithelial cells (HK-2) and renal carcinoma cell lines (786-O, OS-RC-2) were detected by immunoblotting and semi-quantitative PCR. 2. In vitro Experimental study: In this study, 786-O and OS-RC-2 renal cell lines stably expressing SARM were constructed by cell transfection and lentiviral package infection. The effects of stably expressing SARM on the growth and proliferation of renal cell carcinoma cells were detected by cell counting and plate cloning assay. PI staining and Annexin V-PE/7AAD double staining were used, and flow cytometry was used. The effects of stable expression of SARM on cell cycle progression and apoptosis of renal cell carcinoma cells were observed. Molecular targeting drug sunitinib was used to treat renal cell carcinoma cells and the interaction between molecular targeting drugs and SARM was observed. Serum-free starvation was used to induce autophagy of renal cell carcinoma cells stably expressing SARM, and the relationship between SARM and autophagy was discussed. Study: The BALB/C-nu nude mice model of renal cell carcinoma was established by OS-RC-2 stably expressing SARM cells. The effects of stable expression of SARM on the growth curve and tumor-bearing volume of transplanted renal cell carcinoma in nude mice were detected. Fourthly, the preliminary study of molecular mechanism: The PI3K/Akt/mTOR signaling pathway and ERK/MAPK signaling were studied by Western blot. To explore the possible molecular mechanism of stably expressing SARM on the growth, proliferation, cycle progression, apoptosis regulation and autophagy of renal cell carcinoma. 5. Statistical methods: Each group of experiments were repeated three times, and were statistically described by mean soil standard deviation. According to the experimental design, two independent sample t test was used (In The experimental data were analyzed by IBM SPSS 19.0 software, and P 0.05 was statistically significant. Results 1. The expression of SARM protein in clear cell carcinoma of kidney decreased renal dialysis. The level of SARM protein in clear cell carcinoma and renal cell lines was significantly higher than that in normal renal tissues and renal tubular epithelial cells, but the level of protein expression was significantly lower than that in normal renal tissues and renal tubular epithelial cells. NA translation to protein synthesis may be due to ubiquitination modification, resulting in its low expression at protein level. 2. A stable expression of SARM cell line was successfully constructed by X-tremeGENE HP DNA Transfection Reagen transfection and lentiviral packaging infection. Flow cytometry sorted monoclonal cells successfully constructed 786-0 and OS-RC stably expressing SARM. The expression level of GFP-SARM protein was verified by Western blot. 3. The stable expression of SARM inhibited the growth and proliferation of renal cell carcinoma cells. Compared with the GFP control group, the stable expression of SARM significantly inhibited the growth of renal cell carcinoma cells (P 0.05). At the same time, the results of plate cloning showed stable expression of S. ARM significantly inhibited the proliferation of renal cell carcinoma cells (P 0.05). 4. Steady expression of SARM inhibited cell cycle and promoted cell death. Compared with GFP control group, stable expression of SARM inhibited the progression of renal cell carcinoma cells from G1 phase to S phase, and increased apoptosis of renal cell carcinoma cells stably expressing SARM, suggesting that SARM could block the apoptosis of renal cell carcinoma cells. Cell cycle progression, promote renal cell death (P 0.05). Fifthly, SARM can promote sunitinib-induced renal cell autophagy Western blot assay found that sunitinib can enhance the expression of SARM in renal cell lines and induce renal cell autophagy. Stable expression of SARM can promote renal cell autophagy, inhibit SARM. SARM plays an important role in the regulation of Sunitinib-induced autophagy. 6. Stable expression of SARM can inhibit the growth of renal cell carcinoma xenografts in nude mice. OS-RC-2 cell line stably expressing SARM was inoculated subcutaneously in 4-week-old female BALB/C-nu mice to observe the effect of SARM on the autophagy. The growth curve of transplanted tumor was observed. The stable expression of SARM inhibited the growth of transplanted tumor in nude mice, and the tumor volume was significantly smaller than that of GFP control group (P 0.05). 7. The stable expression of SARM induced autophagy of renal cancer cells. The stable expression of SARM induced autophagy of renal cancer cells by serum-free starvation induced stable expression of SARM cell lines. The expression of LC-3 and p62 protein was detected by Western blot. Compared with the control group, the expression of LC-3 protein was significantly increased and that of p62 protein was significantly decreased after stably expressing SARM. On the contrary, the expression of LC-3 protein was significantly decreased after interfering with SARM. The phosphorylation levels of Akt, mTOR and p70S6K decreased after stably expressing SARM, indicating that stably expressing SARM could inhibit PI3K/Akt/mTOR signaling pathway. Ninth, stably expressing SARM inhibiting ERK signaling pathway was detected by immunoblotting. After stably expressing SARM, the phosphorylated ERK1/2 expression level was significantly lower than that of the control group. Conclusion This study is the first to study the expression level of SARM in tumor tissues and cells. It is the first to find that SARM can inhibit the growth of renal cell carcinoma cells and induce autophagy of renal cell carcinoma cells. Initial Molecular Mechanisms: SARM may be involved in regulating the growth of renal cell carcinoma by inhibiting P13K/Akt/mTOR signaling pathway and ERK signaling pathway. SARM-induced autophagy of renal cell carcinoma cells may be mediated by PI3K/Akt/mTOR signaling pathway. SARM may be the target of Sunitinib, a multi-target tyrosine kinase inhibitor. SARM can be used as a new target for molecular targeted therapy of renal cell carcinoma, which provides a new target and a new idea for molecular targeted therapy of renal cell carcinoma.
【學(xué)位授予單位】:南方醫(yī)科大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2014
【分類號】:R737.11
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