CD4+CD25-Foxp3+T淋巴细胞的表型鉴定及其在初发系统性红斑狼疮中的意义

目的 对初发系统性红斑狼疮(SLE)患者外周血异常表达CD4+CD25-Foxp3+T淋巴细胞进行表型鉴定,并探讨其临床意义.方法 对初发SLE患者外周血CD4+T淋巴细胞进行细胞表面分子CD25、CD127、CCR4、糖皮质激素诱导的肿瘤坏死因子受体(GITR)、细胞毒T淋巴细胞相关抗原4(CT-LA-4)]和胞内分子(Foxp3)标染,流式细胞仪检测,并研究CD4+各细胞亚群与狼疮肾炎和疾病活动度(SLEDAI)相关性.结果 SLE患者外周血CD4+CD25-Foxp3+T淋巴细胞表面 GITR、CTLA-4和CCR4表达率与活化T淋巴细胞(CD4+CD25+Foxp3-)相比差异无统计学意义(P均>0.05),而显著低于调节性T淋巴细胞(CD4+CD25+Foxp3+)(P均<0.01);CD4+Foxp3+CD25high,CD4+Foxp3+CD25low和CD4+Foxp3+CD25-细胞中CD127low-百分率分别为(93.8±,3.5)%,(93.7±2.3)%,(92.0±2.1)%,三者之间差异无统计学意义(P>0.05);在CD4+细胞亚群中,当CD127low-时,Foxp3+在CD25high,CD25low和CD25-中表达率分别为 (91.4±2.6)%,(71.9±3.3)%,(9.0±2.2)%,三者之间差异均有统计学意义(P<0.01);SLE患者外周血CD4+CCR4+CD25highT淋巴细胞百分率与SLEDAI呈显著负相关(r=-0.695,P<0.001),狼疮肾炎患者(1.10±0.17)%显著低于SLE无肾炎组(1.61±0.23)%,P<0.01]和健康对照组(1.75±0.10)%,P<0.01];狼疮肾炎患者外周血CD4+ CCR4+CD25low-T淋巴细胞百分率显著高于健康对照组(11.5 ±2.3)%与(8.0±1.0)%,P<0.01)].结论 初发SLE中异常升高的CD4+CD25-Foxp3+T淋巴细胞的表型类似早期活化效应T淋巴细胞.可以用CD4+CD25highCD127low-T淋巴细胞替选CD4+CD25highFoxp3+调节性T淋巴细胞.CCR4+调节性T淋巴细胞可能参与狼疮肾炎发病.

Phenotypic difference between CD4+CD25-Foxp3+ and CD4+CD25+Foxp3+ T cells and its clinical relevance in patients with untreated new-onset lupus

Objective To compare the phenotypes of abnormal CD4+CD25-Foxp3+ T cells with traditional regulatory T cells (CD4+CD25+Foxp3+) in patients with untreated new-onset lupus (UNoL) and investigate their clinical relevance. Methods The expressions of surface markers (CD25, CD127, CCR4, GITR, CTLA-4) and intracellular marker(Foxp3) on the peripheral blood mononuclear cells from twenty-two UNoL patients were analyzed by flow cytometry analysis, and their clinical relevance were assessed. Results There were no significant differences between CD4+CD25-Foxp3+ and CD4+CD25+Foxp3- T cells in the expressions of GITR, CTLA--4 and CCR4 (P>0.05), but they were significantly lower than those of CD4+CD25+ Foxp3+ T cells in UNoL patients (P<0.01). The percentages of CD127low- in CD4+Foxp3+CD25high,CD4+Foxp3+ CD25low and CD4+Foxp3+CD25+ T cells were (93.8±3.5 )%, (93.7±2.3)% and (92.0±2.1)% respectively (P> 0.05), whereas the expressions of Foxp3 on CD4+CD127low- T subpopulations showed significant differences in CD4+CDI27low-CD25high (91.4±2.6)%, CD4+CD127low-CD25low (71.9±3.3)% and CD4+CD127low-CD25- (9.0± 2.2)% T cells(P<0.01 ). The frequency of CD+CCR4+CD25high T cells correlated negatively with SLEDAI (r=-0.695,P<0.001).and it was significantly lower in lupus nephritis patients(1.10±0.17)%compared with SLE patients without nephritis (1.61±0.23)%,P<0.01]and healthy controls (1.75±0.10)%,P<0.01], furthermore,the frequency of CD4+CCR4+CD25low-T cells in lupus nephritis was significantly higher than that in healthy controls(11.5±2.3)%vs (8.0±1.0)%,P<0.01].Conclusion The increased CD4+CD25-Foxp3+ T cells in the Untreated Newonset Lupus(UNoL)patients mimic activated T effector cells.CD4+CD25high-CD127low-T cells can be used to isolate live CD4+CD25highFoxp3+regulatory T cells.CCR4+regulatory T cells may be involved in the pathogenesis of lupus nephritis.