摘要:Objective To study the expression of peripheral blood lymphocyte subsets in psoriatic arthritis (PsA) patients and the short-term efficacy of low doses of interleukin-2 (IL-2). Methods Ninety-five patients with PsA were enrolled as study subjects and 106 healthy people as control group. On the basis of conventional treatment, a total of 22 PsA patients were randomly selected and treated with low dose IL-2 (5 ×105 U/d, continuously used for 5 days, IH), and the disease condition and lymphocyte changes were observed. Flow cytometry was used to detect the absolute count of T subsets dominated by regulatory T cell(Treg) and T helper cell 17(Th17). Wilcoxon rank sum test, χ2 test and Spearman correlation analysis were used for statistical analysis. Results The absolute number of Th17 cells of PsA patients [7.2 (4.0, 12.8) cells/μl] was higher than that of the control group [5.9(4.0, 8.6) cells/μl] (Z=-1.997, P=0.046), the number of Treg cells [25 (17, 36) cells/μl] decreased compared with the control group [30 (23, 40) cells/μl] (Z=-2.957, Z=0.003), T/Treg [50 (36), 76)], B/Treg [7.6 (5.4, 11.5)], CD4+T/Treg [27 (21, 42)], CD8+T/Treg [20 (12, 30)], Th17/Treg [0.34(0.13, 0.51)], Th1/Treg [4.4(2.3, 7.2)], Th2/Treg [0.34(0.20, 0.53)], compared with control group T/Treg [40 (32, 54)], B/Treg [6.5 (4.2, 8.1)], CD4+T/Treg [20 (17, 25)], CD8+T/Treg [16 (11, 24)], Th17/Treg [0.19 (0.13, 0.31)], Th1/Treg [3.5 (1.8, 5.8)], Th2/Treg [0.24 (0.15, 0.39)] were significantly increased (Z=-3.365, -3.217,-5.285, -2.097, -1.69, -1.482, -2.304, P<0.05). Treg cells were negatively correlated with disease activity indexes TJC (r=-0.213, P=0.038), VAS (r=-0.299, P=0.003), PHGA (r=-0.287, P=0.005), DLQI (r=-0.208, P=0.043). Th17 cells increased from [6.3 (2.3, 11.5) cells/μl] to [11 (7, 20) cells/μl, Z=-2.808, P=0.005] after low-dose IL-2 treatment, Treg cells increased from [27 (15, 30) cells/μl] to [71 (37, 98) cells/μl, Z=-3.945, P<0.01]. Because the growth rate of Treg was much higher than Th17, Th17/Treg [before IL-2 treatment: 0.26 (0.11, 0.44), after IL-2 treatment: 0.14 (0.1, 0.35)] returned back to the normal range. After the treatment with IL-2, the patient's activity indicators were significantly improved, and there were no reversible adverse reactions. Conclusion The reduction of Treg cells may be involved in the occurrence and devel-opment of PsA. Low-dose IL-2 treatment can effectively promote the proliferation of Treg cells and the recovery of Th17/Treg balance, which is conducive to the improvement of the condition and good safety.%目的 研究PsA患者外周血淋巴细胞亚群的表达情况,以及小剂量IL-2短期疗效分析.方法 收集PsA患者95例为研究对象,健康人106名为对照组.采用简单随机法选取22例PsA患者在传统治疗(NSAIDs和/或DMARDs)基础上,试验性给予小剂量IL-2(50万U/d,连用5 d,皮下注射)治疗,观察病情及淋巴细胞亚群变化.流式细胞术检测以CD4+CD25+Foxp3+调节性T细胞、辅助性T细胞17(Th17)为主的T细胞亚群绝对计数.采用Wilcoxon秩和检验、 χ2检验、Spearman相关性分析进行统计分析.结果 PsA患者外周血Th17细胞绝对数[7.2(4.0,12.8)个/μl]较对照组[5.9(4.0,8.6)个/μl]升高(Z=-1.997,P=0.046),调节性T细胞数[25(17,36)个/μl]较对照组[30(23,40)个/μl]下降(Z=-2.957,P=0.003),T细胞/调节性T细胞[50(36,76)]、B细胞/调节性T细胞[7.6(5.4,11.5)]、CD4+T/调节性T细胞[27(21,42)]、CD8+T/调节性T细胞[20(12,30)]、Th17/调节性T细胞[0.34(0.13,0.51)]、Th1/调节性T细胞[4.4(2.3,7.2)]、Th2/调节性T细胞[0.34(0.20,0.53)]较对照组T细胞/调节性T细胞[40(32,54)]、B细胞/调节性T细胞[6.5(4.2,8.1)]、CD4+T/调节性T细胞[20(17,25)]、CD8+T/调节性T细胞[16(11,24)]、Th1/调节性T细胞[0.19(0.13,0.31)]、Th1/调节性T细胞[3.5(1.8,5.8)]、Th17/调节性T细胞[0.24(0.15,0.39)]均显著升高(Z=-3.365,-3.217,-5.285,-2.097,-1.69,-1.482,-2.808,-2.304,P<0.05).调节性T细胞与病情活动指标压痛关节数(TJC)[r=-0.213,P=0.038]、疼痛视觉模拟评分(VAS)[r=-0.299,P=0.003]、医生对疾病活动性的总体评分(PHGA)[r=-0.287,P=0.005]、皮肤病生活质量指数(DLQI)[r=-0.208,P=0.043]呈负相关.小剂量IL-2治疗后Th17细胞由[6.3(2.3,11.5)个/μl]增至[10.1(7.0,20.3)个/μl,Z=-2.808,P=0.005];调节性T细胞由[27(15,30)个/μl]增至[71(37,98)个/μl,Z=-3.945,P<0.01],因调节性T细胞的增长幅度远大于Th17,Th17/调节性T细胞[IL-2治疗前:0.26(0.11,0.44),IL-2治疗后:0.14(0.10,0.35)]回降至正常范围.小剂量IL-2治疗后病情活动指标明显改善,且无不可逆的不良反应.结论 调节性T细胞的减少可能参与了PsA的发生、发展,小剂量IL-2治疗可有效促进调节性T细胞的增殖以及Th17/调节性T细胞平衡的恢复,有利于改善病情且安全性良好.