摘要目的 研究难治性肺结核患者外周血单个核细胞(PBMCs)经结核分枝杆菌特异性抗原肽(ESAT-6,CFP-10)刺激后代表性Th1细胞因子IFN-γ、IL-2和TNF-α的表达特点及意义.方法 纳入67例初治肺结核患者、28例难治性肺结核患者和25位结核分枝杆菌潜伏感染者,分离外周血单个核细胞(PBMCs),用ESAT-6,CFP-10肽库刺激PBMCs,采用FlowCytomix流式技术检测细胞培养液上清中细胞因子IFN-γ、IL-2和TNF-oα的浓度.结果 PBMCs经结核分枝杆菌特异性抗原肽刺激后,IFN-γ、IL-2和TNF-α均因刺激而升高,初治组的三个因子的水平均显著高于难治组和潜伏感染组(与难治组比较,Mann-Whitney U值=119.0,282.5、339.5,P均＜0.01;与潜伏感染组比较,Mann-Whitney U值=387.0,477.0、374.5,P=0.0002,0.0033、0.0001),难治组IFN-γ和IL-2的水平显著低于潜伏感染组(Mann-Whitney U值=105.5、162.5,P＜0.01),TNF-α的水平在难治组和潜伏感染组间的差异无统计学意义(Mann-Whitney U值=265.0,P=0.2695).结论 难治性肺结核患者结核分枝杆菌特异性Th1细胞因子反应低下,针对结核病的免疫治疗可能对难治性肺结核发挥更大的作用.

abstractsObjective To investigate the feature of Th1 cytokines induced by Mtb-specific antigen in patients with refractory pulmonary tuberculosis.Methods 28 patients with refractory pulmonary tuberculosis,67 patients with first-treated pulmonary tuberculosis,and 25 healthy controls with positive T.spot (LTBI group) were enrolled.IFN-γ,IL-2 and TNF-α in supernatants from PBMCs stimulated with ESAT-6 and CFP-10 were analyzed with Bender Flowcytomix on flow cytometry.Results The levels of the three cytokines were utmost high in patients with first-treated pulmonary tuberculosis.The lowest level of IFN-γ and IL-2 were induced in patients with refractory pulmonary tuberculosis,and were significantly lower than the LTBI group(Mann-Whitney U ＝ 105.5,162.5,P ＜ 0.01).Conclusions The immunotherapy with IFN-γ and IL-2 may play a role in treatment for refractory pulmonary tuberculosis but not for most of first-treated pulmonary tuberculosis.