亞洲1型FMDV RGD基序和VP1第154位突變對(duì)宿主致病性的影響
[Abstract]:Adsorption of viruses to their receptors is the first step in the initiation of viral infection and plays a decisive role in the pathogenesis. Viral receptors also play an important role in host range and tissue tropism. Therefore, the study of FMDV receptor and receptor recognition sites will play an important role in the pathogenesis, host tropism and host range of FMDV. Previous reports have shown that integrin receptor recognition motifs and RGD+1 and+4 amino acid mutations affect the pathogenic phenotype of FMDV. The RGD motif and RGD+9 amino acids in the G-H loop of type 2 FMDV were changed regularly, and the changes were correlated with the pathogenic phenotype of FMDV. We used the non integrin non heparan sulfate receptor to invade the endocytosis pathway of host cells; we conducted the following research: * the 1.RGD mutation has previously rescued the strains rRGD, rRDD and rRSD from the FMDV identification of pig and bovine integrin receptors, and then compared the biological characteristics of these strains on host cells and their active effects on host cells. * the pathogenicity of pig and cattle also compared their ability to identify the integrin receptor of the rat. Based on the previous studies, we further compared their ability to identify the integrin receptor of pig and cattle * * (1) cloning the subunit genes of the integrin receptor from pig and cattle, constructing the eukaryotic expression plasmid of each subunit and verifying the expression. The results showed that RGD mutation changed the recognition ability of Asia1 FMDV to integrin receptor, and the same strain had different recognition ability to the same integrin receptor in different hosts. 2. RGD + 9 (VP1-154) amino acid mutation had different pathogenicity and recognition to FMDV. The effect of integrin receptor (1) rescued the VP1 S154D mutant strain through the FMDV single particle reverse genetic system. (2) the biological characteristics of host cells and the pathogenic experiment on suckling mice showed that VP1 S154D mutation enhanced the growth capacity and pathogenicity phenotype of FMDV on the host cells and the pathogenicity of suckling mice. (3) pigs * The pathogenicity test results showed that VP1 * S154D mutation enhanced the pathogenicity of FMDV to pigs. (4) finally, the utilization of two integrins * receptors in pig origin was compared. The results showed that VP1 * S154D mutation enhanced the ability of Asia1 FMDV to identify the integrin receptor of pig, especially the endocytosis mediated by alpha V beta 6 and alpha v beta 8.3.FMDV third receptor. In recent years, many reports have shown that FMDV has a third receptor, but so far it has not been identified. Laboratory studies on the endocytosis pathway mediated by the third receptor have been carried out in the CHO-677 cell model without integrin and heparan sulfate receptors infected by Asia1 FMDV. The results of drug inhibition, siRNA interference and dominant negative mutagenesis inhibition showed that when FMDV Asia1/HN/CHA/06 enters CHO-677 cells, both reticulin-mediated endocytosis pathway and pit-mediated endocytosis pathway are used, together with the participation of motilin and acidic environment of nucleosome. In this study, we established a transient expression system of FMDV and RGD *, and compared the effect of FMDV mutation on FMDV recognition of integrin receptor, and revealed the possible cause of RGD mutation leading to pathogenicity variation. It was proved that VP1 S154D mutation enhanced the pathogenicity of Asia1/HN/CHA/06 strain and identified another important part of G-H loop. The endocytosis pathway of FMDV Asia1/HN/CHA/06 in CHO-677 cells by non-integrin and non-heparan sulfate receptors was explored, which laid a foundation for revealing the endocytosis pathway of the third receptor in the future.
【學(xué)位授予單位】:中國(guó)農(nóng)業(yè)科學(xué)院
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類號(hào)】:S852.65
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