结核分枝杆菌肝素结合血凝素在结核病免疫应答中的研究

目的 探讨结核分枝杆菌肝素结合血凝素(HBHA)的免疫应答作用及其在结核病诊断中的应用价值.方法 选取PPD(-)健康对照、PPD(+)潜伏感染者、肺结核患者,分离外周血单个核细胞,用大然HBHA刺激,培养4 d后收集细胞培养上清,ELISA方法检测上清中的IFN-γ.同时用ELISA方法检测各组血清中的HBHA特异的ISG型抗体.结果 HBHA刺激后3组产生的lFN-γ中位数分别为49.5 PS/ml、781.9 pg/ml、341.8 pg/ml,潜伏感染者产生的IFN-γ水平远高于健康对照,略高于肺结核患者.三组血清抗HBHA的IgG抗体浓度吸光度(A)的均值分别为0.212±0.066、0.224±0.076和0.285±0.078.肺结核患者的HBHA特异的IgG抗体远高于健康对照及潜伏感染者.结论 HBHA有较好的免疫原性,可以刺激潜伏感染者产生高水平的IFN-γ,HBHA特异的IFN-γ释放反应有利于鉴别潜伏感染者.HBHA的抗体水平在结核病的诊断中有一定的辅助应用价值.

Study on the immune effect of heparin-binding hemagglutinin adhesin

Objective To investigate the immune protection of heparin-hinding hemagglutinin ad-hesin(HBHA) and to estimate its potential diagnostic value. Methods Native HBHA were used to stimu-late peripheral blood mononuelear cells (PBMCs) from different infected-cases including PPD negative healthy control, PPD positive latent tuberculosis(LTB) infection, pulmonary tuberculosis, and the IFN-γ/in the supernatant of culture was detected. Meanwhile, HBHA specific IgG antibody in the sera was detected by ELISA. Results The middle level of HBHA specific IFN-γ of the three groups were 49.5 pg/ml, 781.9 pg/ml and 341.8 pg/ml, respectively. IFN-γ of latent tuberculosis group was much higher than that of the control, and slightly higher than that of the patients with pulmonary tuberculosis. And the absorbency of the IgG antibody to HBHA in the three groups was 0.212±0.066, 0.224 ± 0.076 and 0.285±0.078. lgG an-tibody in the patients with pulmonary tuberculosis is higher than that of the healthy, including the control and the latent tuberculosis infection. Conclusion HBHA has good immunogenieity, and it can stimulate the LTB to release high level IFN-γ, suggests that the LTB doesn't develop active tuberculosis may rely on its protection. HBHA specific. IFN-γ release may identify 1,333 from the healthy. Anti-HBHA antibody plays an auxiliary role in the diagnosis of pulmonary tuberculosis.