十六個(gè)結(jié)核分枝桿菌新抗原的抗原表位鑒定與評價(jià)
[Abstract]:Tuberculosis is a chronic infectious disease caused by Mycobacterium tuberculosis (MTB), which has been harmful to human health. 1/3 of the people all over the world have infected Mycobacterium tuberculosis, and 10% of them will be likely to develop into TB.2015 for 10 million 400 thousand of the global new tuberculosis cases in the future and die from tuberculosis. There are 1 million 400 thousand people. In recent years, with the increase of new TB drug resistant strains and HIV/AIDs combined infection cases, the incidence of tuberculosis increases and the global tuberculosis burden is increasing. The death rate of tuberculosis has fallen by 22% from 2000 to 2015, and nuclear disease remains the ten major cause of human death. First. At present, BCG is still the only widely used vaccine to resist tuberculosis worldwide..BCG is a live attenuated vaccine obtained by continuous subculture of Mycobacterium tuberculosis. Although the BCG vaccine has a better effect on preventing chestnut tuberculosis and tuberculous meningitis in children, the BCG against adult The protection rate of nuclear disease is very different, between 0 and 80%, and BCG can only effectively prevent primary tuberculosis. The study found that different BCG vaccine strains with the loss of protective antigens or epitopes cause different protective differences of BCG strains. We need to develop new vaccine to provide new means to better control tuberculosis. We need to find new immune dominant antigens or in epitopes for the development of recombinant BCG or a new type of immunized vaccine after BCG inoculation. In this study, we screened the protein antigens on the H37Rv proteome by combining the genomics and bioinformatics techniques, and the selected protein antigens were used for the T cell table. Interferon gamma release assay (IGRA) was used to screen out tuberculosis scores. The immunodominant antigen or epitope of the Mycobacterium was selected. The antigen epitopes with higher positive rate were selected and the BALB/c mice were immunized with the adjuvant DDA and polyI:C. The concentrations of IFN- gamma, IL-2, IL-4 and IL-10 in the splenocytes supernatant after the corresponding antigen stimulation were detected, and the serum IgG, IgG1 and IgG2a antibody titers in the serum were detected. The CD3+CD4+T was detected by flow}0 cytometer. The immunogenicity of these epitopes was evaluated by the ratio of the cells to the CD3+CD8+T cells. The epitopes of the epitopes of the epitopes of the epitopes of the epitopes were synthesized by using seppa2.0 to predict the epitopes of the B cells, and the serological evaluation of these B cell epitopes was carried out with the serum of the patients with pulmonary tuberculosis and healthy volunteers. In addition, the recombinant protein Rv2351c, prepared in this experiment, was studied in this study. The diagnostic and immune effects of Rv2351c were evaluated by IGRA and animal experiments. Finally, we predicted the 2726 T cell epitopes and B cell epitopes of 273 antigens on the H37Rv genome, and selected 265 T cell epitopes from 13 antigens and 22 human B cell antigen tables from 3 antigens. We identified 30 T cell antigen epitopes with antigenicity by IGRA, which were derived from 13 TB antigens: Rv3793, Rv05 85C, Rv1490, Rv0446c, Rv 1547, Rv2201, Rv3573, Rv0197, and the sensitivity of these peptides was between 1.9% and 30%, and the specificity was 96.81% To 100%. After the combined diagnosis of the same antigen, the sensitivity of the single antigen can reach 1.9% ~ 50%.Rv2351c protein sensitivity 61.7%. The specificity is 91.4%. in animal experiments, 11 polypeptide and Rv2351c protein can induce different degree of cellular immune response. Among them, P1 (Rv3793), P24 (Rv0585c), P26 (Rv05) 85C), P55 (Rv1490), P120 (Rv0446c), P121 (Rv0446c) and Rv2351c are mainly induced to produce a mixed cell immune response of Th1 and Th2. 446c) can cause an increase in the proportion of CD3+CD4+T cells in mice. The peptide has P123 (Rv0446c), P166 (Rv0197), P309 (Rv1798), P318 (Rv2318) and Rv2351c protein, which can cause a significant increase in the ratio of CD3+CD8+T cells in mice. At the same time, the titers of the IgG antibodies induced by these 11 peptides ranged from 1:44 to 1:5079, of which P121 (Rv0446c) and P166 (Rv0197) could cause the IgG antibody titer above 1:1000 to cause the antibody titer of IgG to the 1:2.2 * 106.Rv0674 9 cell epitopes of 54.55% to 79.55% and the specificity of 71.25% To 95%, in addition to P203 and P204, the sensitivity of the 7 peptides with areas larger than 0.8.Rv1411c under ROC curves of other peptides is 46.5% to 88.6%, and the sensitivity of 6 peptides with specificity of 75% to 92.5%.Rv1477 is 60.23% to 76.14%, the specificity is 86.25% to 95%. except P220, and the area under ROC curve is more than 0.8. The success of this study is successful. 30 T cell epitopes and Rv2351c proteins from 14 new TB antigens have a certain antigenicity. Animal experimental results confirm that 11 T cell epitopes and Rv2351c proteins can cause cellular immune response and humoral immune response in mice, and have a certain immunogenicity. This study on 22 people of 3 new antigens B thin. The cell epitopes were evaluated by serology. The results showed that the 22 B cell epitopes had a certain value of serological diagnosis. To sum up, 16 new Mycobacterium tuberculosis antigens were identified in this study, which provided a basis for the diagnosis of tuberculosis and the study of vaccines.
【學(xué)位授予單位】:中國疾病預(yù)防控制中心
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:R378.911
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