SLPI啟動子調(diào)控靶向EGFR的人工microRNA用于喉癌的基因治療研究
[Abstract]:Research background:
Laryngeal cancer is the most common malignant tumor of the upper respiratory tract, accounting for about 25% of the head and neck tumors. The traditional treatment of laryngeal cancer is radical surgery or radiotherapy, supplemented by or not supplemented by chemotherapy. However, the loss of laryngeal function or serious side effects caused by traditional treatment greatly affect the quality of life of patients. Although surgical procedures, radiotherapy and chemotherapy regimens have progressed steadily, the survival rate of patients has not improved significantly in the past 30 years.
In the past 20 years, molecular targeted therapy has made great breakthroughs in the treatment of tumors. For head and neck squamous cell carcinoma (HNSCC), the most representative molecular targeted drug is the specific inhibitor of epidermal growth factor receptor (EGF). R) Monoclonal antibodies and small molecule tyrosine kinase inhibitors. However, the small molecule inhibitors represented by gefitinib have no definite effect on HNSCC. While the monoclonal antibodies represented by cetuximab play an auxiliary role in traditional radiotherapy and chemotherapy, however, due to the limited response rate, high drug resistance rate and frequent occurrence. Skin toxicity, gastrointestinal symptoms and other side effects make the application space of these drugs still small.
With the advancement of molecular cloning technology, gene therapy strategy with virus as expression vector and down-regulation of EGFR expression by RNA interference technology has opened up a new direction for tumor treatment. Compared with shRNA, artificial microRNAs incorporate a natural microRNA framework based on retaining the hairpin structure of the first generation of shRNA. In addition to being more efficient, the greatest advantage is that they can be activated by most of the promoters in mammals. This advantage of artificial microRNAs enables the use of tumor tissue-specific promoters to regulate targets. RNA interference with EGFR becomes possible.
Based on the above research background, we intend to design an artificial microRNA targeting EGFR, and use recombinant adenovirus as vector to regulate the expression of the artificial microRNA through the specific SLPI promoter of laryngeal cancer. We also take Hep-2 as the research object to explore the effect of this gene therapy strategy on tumor growth.
Research purposes:
To construct recombinant adenovirus vector loaded with artificial microRNA targeting EGFR under the control of SLPI promoter, and to study its safety and inhibitory effect on laryngeal cancer cells in vitro and in vivo.
Research methods:
1. Adenovirus shuttle plasmids pDC312-SLPI-EGFRamiR-pA and Ad-SLPI-GFP-pA were constructed and co-transfected into HEK293 cells with cytoskeleton plasmids pBGHlox (delta) E1 and 3Cre respectively for adenovirus packaging. Virus titer was determined by TCID50.
2. Human laryngeal squamous cell carcinoma cell line Hep-2 and human normal umbilical vein endothelial cell line HuVEC were infected with recombinant adenovirus Ad-SLPI-EGFRamiR and control virus Ad-SLPI-GFP respectively. The effects of the recombinant adenovirus on the proliferation of laryngeal carcinoma cell line Hep-2 and normal cell HuVEC were examined by microscopy, MTT and flow cytometry.
3. To establish a tumor-bearing model of laryngeal carcinoma in nude mice, we injected recombinant adenovirus Ad-SLPI-EGFRamiR, Ad-SLPI-GFP into the tumor, or orally administered gefitinib daily.
Research findings:
1 packaging, identification, amplification, purification and titer determination of recombinant adenovirus Ad-SLPI-EGFRamiR, Ad-SLPI-GFP
Adenovirus shuttle plasmids pDC312-SLPI-EGFRamiR-pA and pDC312-SLPI-GFP-pA were co-transfected into HEK293 cells with cytoskeleton plasmids pBGHlox (delta) E1 and 3Cre, respectively. About 13 days after transfection, the cells were observed under inverted microscope. More than 80% of the cells showed grape-like cytopathic effect and were not easy to fall off. After the supernatant was treated with protease K, PCR showed that the EGFRamiR fragments with different repeat numbers, 142 bp, 284 bp, 426 bp, were amplified by Ad-SLPI-EGFRamiR, and 1482 BP fragments were amplified by Ad-SLPI-EGFRamiR. The recombinant adenovirus Ad-SLPI-EGFRamiR and the control virus Ad-SLPI-GFP were successfully constructed. For 1 x 1010pfu/ml, the titer of Ad-SLPI-GFP is 6.3 * 109pfu/ml..
Western blot showed that the expression of 170kdEGFR was significantly decreased in Hep-2 cells treated with Ad-SLPI-EGFRamiR virus for 72 hours. However, after 72 hours of infection with Ad-SLPI-GFP, a large number of Hep-2 cells showed strong green fluorescence signal under fluorescence microscope, while HuVEC cells still showed no green fluorescence. EGFR was effectively down-regulated internally and the expression of green fluorescent protein was specifically regulated in human laryngeal squamous cell carcinoma cell line Hep-2, but not in normal human umbilical vein endothelial cell HuVEC. 72 hours was the appropriate infection time.
Inhibitory effect of recombinant adenovirus Ad-SLPI-EGFRamiR 2 on laryngeal carcinoma cell Hep-2 in vitro
2.1 inhibitory effect of recombinant adenovirus on cell proliferation
MTT results showed that the recombinant adenovirus Ad-SLPI-EGFRamiR had a strong inhibitory effect on the proliferation of laryngeal carcinoma Hep-2 cells 72 hours after infection, and could effectively inhibit the proliferation of laryngeal carcinoma cells at MOI 50 pfu/cell (inhibition rate was 22.5%), but had no significant inhibitory effect on the proliferation of normal HuVEC cells (inhibition rate was - 4.2%).
2.2 the morphological changes of the recombinant adenovirus after 72 hours.
After 72 hours of treatment with recombinant adenovirus Ad-SLPI-EGFRamiR (MOI=50), the morphological changes of Hep-2 cells were marked: the cells became round, shrunk, part beaded and floated. The morphological differences of HuVEC cells in normal cells were not obvious before and after treatment with adenovirus Ad-SLPI-EGFRamiR (MOI=50). There was no significant difference in cell morphology.
2.3 quantitative analysis of apoptosis by flow cytometry
Flow cytometry showed that the apoptosis rates of Hep-2 cells (cells stained by Annexin V-R-PE and 7-AAD) were 32.8% and 31.8% respectively 72 hours after the recombinant adenovirus Ad-SLPI-EGFRamiR was treated with MOI=35 and MOI=50, while the corresponding apoptosis rates of Hep-2 cells treated with Ad-SLPI-GFP for 72 hours were 9.2% and 10.0% respectively. The difference between the two viruses was significant quantitatively. These results suggest that recombinant adenovirus Ad-SLPI-EGFRamiR can effectively induce apoptosis and inhibit the growth and proliferation of laryngeal cancer cells, while for normal umbilical vein endothelial cells HuVEC, the apoptosis rates of AD-SLPI-EGFRamiR and Ad-SLPI-GFP after 72 hours treatment are 11.1% and 8.2% respectively, and the apoptosis rates of HuVEC treated with the corresponding virus MOI=50 are 15. 5%, 4.8%, the difference is not significant.
Inhibitory effect of recombinant adenovirus Ad-SLPI-EGFRamiR 3 on growth of tumor tissue in laryngeal carcinoma model
3.1 inhibitory effect of recombinant adenovirus Ad-SLPI-EGFRamiR on tumor growth in vivo
On the 13th day after the first treatment, the tumor volume of the Ad-SLPI-EGFRamiR group was smaller than that of the Ad-SLPI-GFP group and the gefitinib group, but the difference was not statistically significant (P 0.05). Compared with the tumor volume of the first treatment day, the growth rate of the tumor volume of the Ad-SLPI-EGFRamiR group was smaller than that of the Ad-SLPI-GFP group and the gefitinib group, but there was no significant difference. Significant statistical significance (P 0.05). At the end of the observation (20 days after the first administration), the tumor weight of the Ad-SLPI-EGFRamiR group was less than that of the Ad-SLPI-GFP group and the gefitinib group, but there was no significant difference (P 0.05).
3.2 adverse effects of recombinant adenovirus Ad-SLPI-EGFRamiR in vivo
During the course of treatment, the nude mice in the Ad-SLPI-EGFRamiR group and the Ad-SLPI-GFP group were in good physical condition, mental state, activity and dietary condition without obvious abnormalities. The difference (P0.05) was significantly higher than that in gefitinib group (P0.05).
Research conclusions:
1. The recombinant adenovirus Ad-SLPI-EGFRamiR and AD-SLPI-GFP can effectively infect Hep-2 cells and express the corresponding genes, which has good tissue specificity for laryngeal carcinoma.
2. The recombinant adenovirus Ad-SLPI-EGFRamiR can inhibit the growth of laryngeal carcinoma cells in vitro, but has a low inhibitory effect on normal cells.
3, in nude mice bearing tumor, recombinant adenovirus Ad-SLPI-EGFRamiR has a tendency to inhibit the growth of tumor tissue.
4, in nude mice bearing tumor, the recombinant adenovirus has high safety compared with gefitinib.
【學位授予單位】:浙江大學
【學位級別】:博士
【學位授予年份】:2013
【分類號】:R739.65;R450
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