活动期肺结核患者CD4^＋、CD154^＋T细胞亚群数量的改变

目的探讨CD4^＋、CD154^＋T细胞亚群在活动期肺结核患者和PPD皮试阳性健康人中的分布情况及其规律。方法建立以流式细胞仪检测CD4^＋、CD154^＋T细胞亚群的方法，比较CD4^＋、CD154^＋T细胞亚群在初治肺结核病人和PPD阳性健康人的特性。结果PBMCs抗原刺激时同时加入PE标记抗人CD154抗体的持续标记方法优于细胞破膜染色的检测方法（1．51±0．36／0．40±0．13，P〈0．05）；新分离未经刺激的CD4^｜＋T淋巴细胞不表达CD154，特异抗原刺激后CD154表达显著增加；活动期初治肺结核PBMCs的CD4^＋、CD154^＋T细胞亚群数量显著低于PPD阳性健康者（0．72±0．32／1．65±0．76，P〈0．01）。结论CD4^＋、CD154^＋T细胞亚群数量在活动期初治肺结核患者显著降低，可能与结核病发病关系密切。

Reduced population of CD4+,CD154+ T cell subset in patients with active pulmonary tuberculosis

Objective To study population frequencies of CD4+,CD154+ T cell subset in patients with pulmonary tuberculosis and controls with positive PPD reaction. Methods Flow cytometry was used to detect the CD4+,CD154+ T cell subset, the population frequen-cies in patients with pulmonary tuberculosis and controls were compared. Results The expression level of CD154 was higher when PE-la-beled CD154 antibody was added during stimulation period, compared with CD154 labeling after stimulation(1.51±0. 36/0. 40±0. 13, P <0.05). The CD154+ cells were not detectable in fresh isolated CD4+ T cells, but significantly increased after stimulation with specific anti-gens. The population of CD4+, CD154+ T cell subset was significantly reduced in patients with active pulmonary tuberculosis, compared with healthy controls with PPD positive reaction(0. 72±0. 32/1.65±0. 76, P <0. 01). Conclusions The population of CD4± ,CD154± T cell subset was significantly reduced in patients with active pulmonary tuberculosis, which indicated that it may play an important role in the de-velopment of tuberculosis.