机构地区:[1]首都医科大学附属北京胸科医院国家结核病临床实验室北京市结核病胸部肿瘤研究所耐药结核病研究北京市重点实验室,101149 [2]首都医科大学附属北京胸科医院药物研究室,101149 [3]青岛农业大学山东省预防兽医学重点实验室
出 处:《中国防痨杂志》2015年第4期333-338,共6页Chinese Journal of Antituberculosis
基 金:“十二五”国家科技重大专项(2013ZX10003009);北京市高层次卫生技术人才培养项目(2011-3-069);北京市医院管理局临床医学发展专项(ZYLX201304)志谢中国疾病预防控制中心结核病防治临床中心姜晓颖博士在统计学方面给予了极大的帮助!
摘 要:目的 明确结核病患者T细胞亚群的失衡状况,以期发现色氨酸(TRP)-犬尿氨酸(KYN)代谢中间产物对T细胞亚群的影响,以解释结核病患者T细胞亚群发生变化的可能机制。 方法 结核病患者来源于首都医科大学附属北京胸科医院2012年9月至2012年12月期间,经细菌学、病理学和影像学检查明确诊断为肺结核的患者,无合并糖尿病等其他合并疾病,共104例,经数字表法随机抽样选取45例作为试验组;健康对照患者来源于同期北京市昌平区结核病防治所的健康体检志愿者,共100名,经数字表法随机选取其中39名作为健康对照组。采用流式细胞分析方法检测试验组和健康对照组的血细胞中调节性T细胞(Treg细胞)和T辅助细胞17(Th17)的水平;进一步通过体外添加TRP及其代谢中间产物KYN和喹啉酸(QA)来刺激CD4^+和CD8^+ T淋巴细胞,观察其对细胞凋亡的影响,分析TRP及其代谢中间产物对T细胞分化的影响。采用SPSS 17.0软件进行统计学分析,流式细胞分析结果所获数据符合方差齐性和正态分布,以“x±s”表示,采用t检验进行统计学分析,P〈0.05为差异有统计学意义。 结果 与健康对照组[(0.41±0.26)%]相比,试验组的Treg细胞的比率[(1.49±0.82)%]显著上升(t=33.64,P=0.000),而Th17的比率[健康对照组(0.73±0.43)%、试验组(1.04±0.72)%]虽有所上升,但差异无统计学意义(t=44.46,P=0.071)。体外细胞刺激试验发现:高浓度的KYN(2.0 mmol/L)对CD4^+ T淋巴细胞[健康对照组(8.40±3.28)%、试验组(30.07±7.37)%;t=7.49,P=0.000]和CD8^+ T淋巴细胞[健康对照组(15.31±1.88)%、试验组(26.36±1.09)%;t=4.89,P=0.003]具有明显的诱导凋亡作用。对CD4^+ T淋巴细胞而言,添加高浓度的TRP(2.0 mmol/L)和 QA(2.0 mmol/L)后,试验组TRP和 QA的细胞凋亡比率分别为(Objective To identify the association between the changes of tryptophan (TRP) metabolites and the imbalance of the T-cell subsets in patients with tuberculosis (TB) and to explore the possible mechanism. Methods The TB patients enrolled in this study came from Beijing Chest Hospital. Forty-five patients were randomly selected from 104 TB patients who were diagnosed in the hospital from September 2012 to December 2012 (patients with complications, such as diabetes, were excluded). At the same time, 39 healthy controlled subjects were randomly recruited from 100 volunteers who received physical examinations at Changping District TB Dispensary of Beijing. The proportions of regulatory T (Treg) cells and T helper 17 (Th17) cells in peripheral blood of enrolled TB patients and healthy subjects were tested by flow cytometry assay. By addng TRP and its metabolites (KYN and QA) to stimulate CD4^+ and CD8^+ T lymphocytes in vitro, their effects on cell apoptosis and proliferation were analyzed. SPSS 17.0 was used for statistic analysis. The results of the tests were presented as “x±s” and P〈0.05 of t-test was regarded as statistical significance. Results To compare with the healthy control group, the proportion of the Treg cells in TB patients significantly increased ((1.49±0.82)% in TB group and(0.41±0.26)% in control group; t=33.64, P=0.000), and the proportion of Th17 in TB patients increased too ((1.04±0.72)% in TB group and (0.73±0.43)% in control group), but it was not significant difference (t=44.46, P=0.071). The results of stimulation tests in vitro showed that: high concentration of KYN (2.0 mmol/L) induced the apoptosis of CD4^+ T cells ((8.40±3.28)% in healthy control group and (30.07±7.37)% in TB group; t=7.49, P=0.000) and CD8^+ T cells ((15.31±1.88)% in control group and (26.36±1.09)% in TB group; t=4.89, P=0.003). However, after stimulated with a high concentration of TRP (2.0 mmol/L) or QA (2
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