結(jié)核分枝桿菌PPE蛋白家族免疫原性初探
[Abstract]:Tuberculosis (TB) is a chronic zoonotic infectious disease caused by Mycobacterium tuberculosis (Mycobacterium tuberculosis) infection. It is still one of the most important diseases threatening human health. Traditional diagnostic methods of tuberculosis are susceptible to interference from many factors and produce high false positive or false negative results. As a result, it is not conducive to the early diagnosis and treatment of tuberculosis. Therefore, it is necessary to develop novel, effective, sensitive and specific diagnostic techniques. True tuberculosis patients. About 10% of the genome of Mycobacterium tuberculosis is used to encode PE (the proteins which contain Pro-Glu (PE) motif) and the PPE (the proteins which contain Pro-Pro-Glu (PPE) motif) protein family, and the family proteins are unique to Mycobacterium tuberculosis. However, a systematic analysis of the immunogenicity of PPE protein is rare.
In this study, 10 members of PPE protein family were selected as the research object by phylogenetic analysis. The PPE protein coding gene was amplified by PCR and cloned into pET32a or pET41a plasmid to construct recombinant PPE protein expression vector. The recombinant PPE fusion protein was transformed into E. coli BL21 (DE3) and the positive expression strain was screened. The purified recombinant PPE fusion protein was separated and purified by affinity chromatography and coated with 96-well enzyme plate as the target antigen. A standard ELISA-based serological method was established for the early diagnosis of tuberculosis. The sera of 60 clinically confirmed tuberculosis patients and 30 healthy persons were used for ELISA detection. The OD values were analyzed by SPSS17.0 software. ROC curves were made to calculate the sensitivity and specificity of ELISA, and to further evaluate the value of each PPE antigen for early serological diagnosis.
In this study, 10 selected PPE antigens were cloned and expressed in E. coli. However, PPE68 was not purified successfully. ELISA was established by using purified PPE protein as coating antigen. The results showed that the sensitivity of ELISA using PPE protein as antigen was higher than that of Ag85A. The area under ROC curve of Ag85A antigen was only small. The area under the ROC curve of all PPE proteins was greater than 0.679, indicating that the serological diagnostic accuracy of PPE proteins as antigens was higher. This is because Ag85A not only exists in Mycobacterium tuberculosis, but also exists in other Mycobacterium such as BCG. It is easy to cause cross-reaction and therefore has low specificity. White (PPE68) was not purified successfully; the specificity of PPE37 was the highest (99.3%) after ESAT-6 (early secretory antigenic target-6), but its sensitivity (65%) and accuracy (ROC area 0.738) were higher than that of ESAT-6, and it was not reported at home and abroad, suggesting that PPE37 could be used as a specific antigen of Mycobacterium tuberculosis. The sensitivity (65%-80%) and accuracy (ROC curve area 0.761-0.805) of the third class of PPE proteins (PPE36, PPE41, PPE57, PPE58, PPE59, PPE69) were higher than those of PPE37, but their specificity was slightly lower (80%-93.3%) and were consistent with the results reported in the relevant literature. The detection sensitivity (63.3%) of PPE-like protein (PPE17), specificity (83.3%) and accuracy (0.679 under ROC curve) were not high; the detection sensitivity (63.3%) of PPE-like protein (PPE64), specificity (90%) and accuracy (0.757 under ROC curve) were similar to PPE-37, suggesting that PPE-like protein could also be used as a candidate antigen for new serological diagnosis.
Nine PPE antigens were successfully cloned, expressed and purified in this study. The immunogenicity of PPE antigens was preliminarily verified by ELISA. The sensitivity, specificity and accuracy of PPE37 and PPE64 of the second and fifth PPE antigens were significantly better than those of ESAT-6, and there were no reports on these two kinds of PPE eggs at home and abroad. We will further apply these purified PPE antigens to stimulate peripheral blood mononuclear cells of tuberculosis patients and analyze their cellular immune responses, evaluate the immunogenicity of PPE antigens and explore their significance in tuberculosis diagnosis or vaccine research.
【學(xué)位授予單位】:浙江理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:R392.1
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