Objective To explore the role of fas apoptosis signal transduction pathway in the abnormal apoptosis of Foxp3 + CD4 + CD25 + Treg in patients with systemic lupus erythematosus ( SLE ).Methods Twenty-five active SLE patients, 20 remission SLE patients and 25 controls were selected. The level of fas expression on peripheral blood Foxp3 + CD4 + CD25 + Treg surface was detected in SLE patients.And analyzed the expression rate of Foxp3 on CD4 + CD25 + T cells was analyzed to explore the relationship between the expression rate and disease activity. Results ( 1 ) The expression rate of fas on Foxp3 + CD4 +CD25 + Treg was (23.72 ± 2. 35 )% , ( 14. 0 ± 2. 1 )% in active and remission SLE groups respectively versus ( 10. 1 ± 1.2)% in control group. The fas expression rate of active SLE group was significantly higher than those of remission SLE group( P ＜ 0. 01 ) and control group ( P ＜ 0. 01 ). And the remission SLE and control groups were not statistically significant ( P ＞0. 05 ). The expression rate of fas on the Foxp3 + CD4 +CD25 + Treg was positively correlated with the SLEDAI ( SLE disease activity index ) score ( r = 0. 336, P ＜0.05). (2) The expression rate of Foxp3 on CD4 +CD25 +T cells was (2.83 ±0.30)%, (5.38 ±0. 63 ) % in active and remission SLE groups respectively versus ( 8. 12 ± 0. 70 ) % in control group. The expression rate of Foxp3 was significantly lower in active SLE group than that in remission SLE group ( P ＜0. 01 )and control group( P ＜0. 01 ). And the Foxp3 expression rate of remission group was also lower than that of control group ( P ＜ 0.05 ). The expression rate of Foxp3 was negatively correlated with the SLEDAI score (r = -0. 581, P ＜ 0. 01 ). (3) The expression rate of Foxp3 was negatively correlated with fas (r=- 0. 349, P ＜ 0. 01 ). Conclusion The abnormal apoptosis of Foxp3 + CD4 + CD25 + Treg mediated by the fas apoptosis signal transduction pathway may be one of the pathogenic mechanisms of disease activity in SLE patients.%目的 探讨fas凋亡信号传导途径在系统性红斑狼疮(SLE)患者Foxp3+CD4+CD25+Treg凋亡异常中的作用.方法 选取活动期SLE患者25例、缓解期SLE患者20例及健康对照25名为研究对象,检测所有研究对象外周血Foxp3+CD4+CD25+Treg表面fas的表达,同时分析CD4+CD25+T细胞Foxp3表达.并分别将fas表达率及Foxp3表达率与病情活动性(SLEDAI评分)进行相关分析.结果 (1)外周血Foxp3+CD4+CD25+Treg上fas的表达:活动期SLE组为(23.72±2.35)%,缓解期SLE组为(14.0±2.1)%,对照组为(10.1±1.2)%,在活动期SLE组明显高于缓解期SLE组(P＜0.01)和对照组(P＜0.01),而缓解期SLE组与对照组差异无统计学意义(P＞0.05),fas在Foxp3+CD4+CD25+Treg上的表达与SLEDAI评分呈正相关(r=0.336,P＜0.05).(2)外周血CD4+CD25+T细胞Foxp3的表达:活动期SLE组为(2.83±0.30)%,缓解期SLE组为(5.38±0.63)%,对照组为(8.12-±0.70)%.活动期SLE组外周血 CD4+CD25+T细胞Foxp3表达明显低于缓解期SLE组(P＜0.01)和对照组(P＜0.01);而缓解期SLE组亦低于对照组(P＜0.05).外周血Foxp3表达与SLEDAI评分呈负相关(r=-0.581,P＜0.01).(3)Foxp3与fas的表达呈负相关(r=-0.349,P＜0.01).结论 SLE患者中存在由fas介导的Foxp3+CD4+CD25+Treg的过度凋亡,这可能是导致SLE病情活动的机制之一.
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