CD4+ CD25+ CD127low/-T细胞在系统性红斑狼疮活动期患者中的表达

目的 检测调节性T细胞(Treg)的新旧标志,进一步探讨Treg细胞在系统性红斑狼疮(SLE)发病中的作用.方法 采用三色直接荧光素标记法和多参数流式细胞术检测29例SLE患者及24例正常对照组外周血CD4+ CD25+ CD127low/-T细胞、CD4+ CD25highT细胞及CD4+ CD25+FOXP3+T细胞的比例,同时检测外周血抗dsDNA等抗体及免疫球蛋白、补体等水平并进行相关分析.结果 SLE患者外周血CD4+ CD25+ CD127low/-T细胞与正常对照组差异无统计学意义(P＞0.05),CD4+ CD25+ FOXP3+T细胞(2.1±1.2)%]及CD4+ CD25highT细胞(0.8 ±0.4)%]与正常对照组(1.8±0.8)%及(4.0±1.4)%]比较差异有统计学意义(P＜0.01);SLE组3种细胞占CD4+ CD25+T细胞的比例均明显低于正常对照组(均P＜0.01),CD4+ CD25+ CD127low/-T细胞、CD4+CD25+ FOXP3+T细胞及CD4+ CD25highT细胞分别占CD4+ CD25+T细胞的比例及与年龄、性别和病程,IgG、IgA、IgM、尿蛋白,24 h蛋白尿,抗dsDNA、抗Clq、抗核小体抗体水平均无相关性(均P＞0.05);但其与SLEDAI评分均存在负相关(P＜0.05).仅CD+ CD25+ GD127low/-T细胞/CD+ CD25+T细胞与补体C4存在明显的负相关(P＜0.01).结论 Treg细胞与活化的CD4+T细胞的相对比例可能在SLE的发病中起到重要作用.

Expression of CD4+ CD25+ CD127(low/-) T cells in patients with systemic lupus erythematosus

OBJECTIVE: To detect the new and old surface markers of regulatory T cells (Treg cells) in the CD4+ T cells of the patients with systemic lupus erythematosus (SLE) in order to reveal the role of Treg cells in the pathogenesis of SLE. METHODS: Peripheral blood samples were collected from 29 newly diagnosed and treatment-na?ve SLE patients, 3 males and 26 females, aged (34 +/- 13), and 24 sex and aged-matched healthy controls. Three-color flow cytometry was used to detect the CD4+CD25+ CD127(low/-) T cells, CD4+CD25high T cells, and CD4+CD25+FOXP3+ T cells. The serum anti-nuclear antibody (ANA), anti-ds-DNA antibody, anti-smooth muscle antibody, anti-nucleosome antibody, anti-C1q, C3, and C4 were detected. Blood and urine routine examinations were conducted. RESULTS: The proportion of blood CD4+ CD25+CD127(low/-) T cells of the SLE patients was not significantly different from that of the controls (P > 0.05), however, the proportions of CD4+CD25+FOXP3+ T cells and CD4+CD25high T cells of the SLE patients were 2.1 +/- 1.2 and 0.8 +/- 0.4 respectively, both significantly lower than those of the controls (4.0 +/- 1.4 and 1.8 +/- 0.8 respectively, both P <0.01). The ratios of the CD4+CD25+CD127(low/-) T cells, CD4+CD25high T cells, and CD4+CD25+FOXP3+ T cells to the CD4+CD25+ T cells of the SLE patients were 0.5 +/- 0.1, 0.1 +/- 0, and 0.3 +/- 0.1 respectively, all significantly lower than those of the controls (0.6 +/- 0.1, 0.2 +/- 0.1, and 0.5 +/- 0. respectively, all P <0.01). The level of CD4+CD25+CD127(low/-) T cell was positively correlated with the levels of CD4+CD25+FOXP3+ T cells and CD4+CD25high T cell (both P < 0.01). The levels of these 3 kinds of cells and their ratios to CD4+CD25+ T cells had no correlation with age, sex, course, IgG, IgA, IgM, urine protein, TIPU, anti-dsDNA, anti-C1q, anti-nuclear body antibody (all P > 0.05), however, were significantly associated negatively with SLE disease activity index, P < 0.05). Only the CD4+CD25+CD127(low/-) T cells/ CD4+CD25+ T cells was negatively correlated with C4 (P <0.01). CONCLUSION: The relative ratio of Treg cells to the activated CD4+ T cells may play an important role in the pathogenesis of SLE.