嵌合型重組腺病毒Ad5F35介導(dǎo)的堿性成纖維細(xì)胞生長(zhǎng)因子基因治療兔耳缺血性慢性創(chuàng)面的實(shí)驗(yàn)研究
[Abstract]:Research background:
Chronic wound is a common surgical disease. There are many causes, complicated pathology, poor tissue regeneration and difficult healing. On the basis of improving the state of the whole body and controlling the original disease, the treatment of chronic wounds is mainly based on the external use of drugs or dressings except the operation to remove the necrotic tissue. Ischemia is a chronic wound. It is important to stimulate angiogenesis, improve blood transport, enhance tissue regeneration, and promote wound healing. It has become a focus of research on chronic wound repair. Recently, it is noticeable that bioactive growth factors such as TGFbeta, bFGF and neurotransmitter CGRP (calcintonin-gene related peptide) and asoactive intestinal Polype The application of ptide, as an important angiogenic stimulator and the strongest known mitogen, can not only promote the proliferation, chemotaxis and angiogenesis of many cells, but also play an important role in tissue repair and wound healing. The effect of bFGF egg white factor on the wound is limited. It is easy to be degraded by various enzymes in the wound; the cost of continuous direct administration is too high. And the bFGF protein factor is applied to the wound by the vector mediated gene transfer method, which can improve the blood transport, enhance the ability of tissue regeneration and promote the healing of the wound. The therapeutic strategies have the disadvantages of low efficiency, poor target specificity and short gene expression time. Therefore, this study aims to design and construct a new chimeric recombinant adenovirus to improve the transfection efficiency, improve the targeting and enhance the gene expression of bFGF, and use the chimeric recombinant adenovirus to mediate bFGF Chronic ischemic wound in rabbit ears.
The purpose of the study is:
The expression of human basic fibroblast growth factor (bFGF) was mediated by the modified model of rabbit ear ischemia and chronic wound surface, and the expression of human basic fibroblast growth factor (bFGF) was mediated, and whether it could promote angiogenesis, enhance the regeneration of tissue cells, promote the healing of chronic wounds, and protect the chronic wounds. The effects of bFGF and traditional bFGF on wound healing were compared and compared.
Research contents and methods:
1. construction, identification and amplification of recombinant chimeric adenovirus Ad5F35-ET-bFGF., the EDN1 promoter was amplified by PCR to insert pDC316ET-bFGF into the early constructed pDC316-bFGF adenovirus shuttle vector, and the shuttle plasmid pDC316ET-bFGF and Ad5/F35 chimeric adenovirus matrix pPE3-F35 were co transfected to the packaged cell to obtain the virus. The correct recombinant clone, Ad5F35-ET-bFGF, was obtained by PCR method and gene sequencing. Then the adenovirus was amplified by repeated infection of 293 cells. The virus was purified by cesium density gradient centrifugation. Finally, the virus titer was converted to the final virus by calculating TCID50.
2. the model of rabbit ear ischemic chronic wound and the expression of recombinant adenovirus in the wound. A circular skin defect area with a diameter of 1cm was made in the ear dorsal side of New Zealand white rabbit. The gross observation, HE staining, wound healing rate, rabbit ear skin temperature measurement, venous blood gas analysis and fluorescence immunoassay were evaluated. The reliability and feasibility of the model and the expression of recombinant adenovirus in the wound were identified.
The gene therapy of 3. chimeric recombinant adenovirus mediated bFGF for rabbit ear chronic wound. The experiment was divided into 5 groups: group Ad5F35-ET-bFGF, group Ad5bFGF, group Ad5F35-ET-EGFP, exogenous bFGF group and blank control group. After operation, 1,3,5,7,9,14d, multipoint injector was used (10 points) to be injected subcutaneously on the periphery of each rabbit ear: Ad The recombinant chimeric adenovirus Ad5F35-ET-bFGF was injected into each wound of the 5F35-ET-bFGF treatment group, and the virus was diluted to the total amount of LML and 0.1ml with the phosphate buffer solution (PBS). The Ad5-bFGF treatment group used the same method to infuse 10pfu/ml Ad5-bFGF LML; Ad5F35-ET-EGFP group used the same method to inject 108pfu/ml. The F treatment group used the same method to infuse the recombinant bovine b FGF LML with the same method, and the blank control group did not intervene. Through gross observation, HE staining and immunohistochemistry, PCR, Western and other methods, the expression of bFGF in the wound was detected. The recombinant chimeric adenovirus mediated bFGF and common adenovirus mediated bFGF, and exogenous bFGF on the wound healing were evaluated. Different effects and effects.
The results of the study:
1. through the homologous recombination technology, the END1 promoter guided bFGF gene was constructed and the chimeric proliferating adenovirus Ad5F35-ET-bFGF with high infection and specific target expression was constructed, and the virus titer was measured to be 5.56 x 1010pfu/ml.
2. the model of rabbit ear ischemia and chronic wound was prepared. Through gross observation, HE staining, the calculation of wound healing rate confirmed that the rabbit ear ischemic wound model was reliable, stable and feasible. The fluorescent immunoassay showed that the recombinant adenovirus was transfected to the wound tissue successfully, and the expression was positive in the cell, and the expression time lasted for at least 2 weeks.
3.HE staining, immunohistochemistry showed that Ad5F35-ET-bFGF was highly expressed in the chronic wound tissue, and the Wsetern Blot semi quantitative detection showed that the excessive expression of bFGF protein in the wound tissue lasted for at least 2 weeks. The fluorescence quantitative PCR detection results showed that the bFGFmRNA level in the wound was obviously increased after the transfection. All the results showed Ad5F35-ET-bFGF. The therapeutic effect of chronic wounds is better than that of other experimental groups and control groups.
Conclusion:
On the basis of building a chimeric recombinant adenovirus Ad5F35-ET with high infection efficiency and specific target expression, bFGF gene is used to treat chronic ischemic wounds. It is proved that it has good therapeutic effect on chronic wound, which is better than traditional adenovirus and exogenous growth cause. Some of the improved research methods, characteristics and innovative technologies in the experiment also represent the future direction of bFGF gene therapy.
【學(xué)位授予單位】:第二軍醫(yī)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2010
【分類號(hào)】:R764
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