甲型流感病毒M2蛋白的表達、純化及其免疫原性的研究
[Abstract]:Influenza virus can cause disease and spread rapidly in a short period of time. The influenza A virus is the most prevalent in the world almost every year, it will cause different degrees of epidemic in the world, endanger human health and cause serious economic losses. Today, most influenza A vaccines are viral cleavage vaccines, inactivated vaccines or recombinant vaccines targeting virus surface antigens HA and NA, but because of the large variation in surface antigens HA and NA, The cross-protection of these vaccines between different subtypes is greatly limited. M2 protein is the third antigen protein on the surface of influenza virus particles and is highly conserved in all known subtypes of influenza A viruses. Little has changed since the 1918 influenza pandemic. Therefore, M 2 protein has become an ideal candidate antigen for influenza A wide spectrum vaccine. M 2 protein is expressed in low density on the coating of virus particles, so it is difficult to induce M2 specific antibody by inactivated virus vaccine. Therefore, low-cost prokaryotic expression system has become an effective way to obtain a large number of antigens. However, the M 2 recombinant protein is so hydrophobic that it is difficult to express in prokaryotic system. In the process of prokaryotic expression of M2 protein, we accidentally obtained the mutant M2 protein, a short peptide in C-terminal, which makes it have a high expression level in E.coli. The recombinant protein M2MH with high purity was obtained by optimizing the purification conditions. The results of mass spectrometry and electron microscopy showed that M2MH formed a polymer, which indicated that it was an antigen and had good immunogenicity. After immunizing BALB/C mice with purified recombinant protein M2MH, a high titer M2 specific polyclonal antiserum was induced in mice. It can recognize not only the recombinant protein M2 expressed on the surface of eukaryotic cells, but also the virus surface antigen protein M2 of different subtypes of influenza A, and the natural protein M2 expressed on the surface of MDCK cells infected by influenza virus, indicating that M2MH has mutated polypeptides. But it retains a strong immunogenicity. The immune protective effect of recombinant protein was evaluated from the changes of body weight, survival rate and lung tissue pathological changes in mice after immunization with lethal influenza A virus. The results showed that the recombinant protein could induce a certain immune response in animals and make mice resist the attack of virus effectively. The results provided a basis for the further development of wide-spectrum vaccine using M2MH as antigen. In addition, we successfully screened 28 hybridoma cell lines secreting monoclonal antibody against M2 protein by using hybridoma technique, which laid a foundation for the diagnosis, treatment and pathogenesis of influenza A virus infection.
【學位授予單位】:清華大學
【學位級別】:碩士
【學位授予年份】:2010
【分類號】:R392
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