摘要:Objective To investigate the percentage and significance of CD4+ CD25+ Foxp3+ regulatory T cells in the patients with heamorrhagic fever with renal syndrome (HFRS). Methods Peripheral blood samples were collected from 27 HFRS patients, and 19 healthy controls to examine the proportion of the CD4+ CD25+Foxp3 + cells. RT-PCR was used to detect the Foxp3 mRNA expression in the mononuclear cells in peripheral blood. Biopsy was conducted on the HFRS patients during oliguria stage. Peripheral blood samples and morning urine samples were collected in the stages and in the very day of renal biopsy to examine the urine protein, urine creatinine (Cr), blood Cr, and creatinine clearance rate (Ccr). Results The percentages of CD4+ CD25+ Foxp3+> in the HFRS patients in the hypetension, oliguria, polyuria, and convalescent stages were 5.0% ± 1.2%, 3. 1%± 0. 8%, 4. 2% ± 0. 9%, and 5.0% 4± 1.1% respectively, all significantly lower than that of the normal control group (6. 5% ± 2. 1%, all P < 0. 01). The proportion of CD4+ CD25+ Foxp3 +> T cells in the CD4 +> T cells in the oliguria stage was significantly lower than those in other stages and that of the normal controls (P <0. 01). The percentage of CD4 + CD25 + Foxp3 + in the patients with HFRS was significantly correlated with the renal injury index (r = 0. 51, P <0. 01), but not significantly correlated with urine protein and renal function changes (r =0. 11 and 0. 18, both P > 0. 05). The expression level of Foxp3 mRNA in peripheral mononuclear cells of the HEFS patients in the oliguria stage was (503 ± 64), significantly lower than that of the normal controls (3102 ±409, P <0. 01) and those of the HFRS patients in the hypotension, polyuria, and convalescent stages (1805 ±291, 1869 ±320, and 2697±420,all P <0.01). Conclusion The proportion of CD4+ CD25+ Foxp3 + regulatory T cells decreases in patients with HFRS, which may contribute to the pathological process in such disease.%目的 研究CD4+CD25+Foxp3+调节性T细胞在肾综合征出血热(HRFS)患者外周血中的比例改变并探讨其在疾病进程中的意义.方法 选取27例HRFS患者,外周血用细胞内染色的流式细胞术及荧光定量PCR的方法,分别在蛋白质和mRNA水平检测Foxp3+表达,并与肾活检结果及肾功能进行相关分析.同时取19名正常健康体检者作为正常对照组.结果 HRFS患者各期CD4+CD25+Foxp3+T细胞占CD4+T细胞比例明显均低于正常对照组(低血压休克期:5.0%±1.2%,少尿期:3.1%±0.8%,多尿期:4.2%±0.9%,恢复期:5.0%±1.1%,正常对照组:6.5%±2.1%,均P<0.01);各期间CD4+CD25+Foxp3+T细胞占CD4+T细胞比例差异亦有统计学意义,以少尿期为最少(P<0.01).CD4+CD25+Foxp3+T细胞占CD4+T细胞比例与肾组织损害指数显著相关(r=0.51,P<0.01),但与蛋白尿程度及肾功能损害无显著相关(r=0.11,0.18;均P>0.05).HRFS患者少尿期外周血单个核细胞中Foxp3 mRNA表达水平(503±64)明显低于正常对照组(3102±409)和其他期(低血压休克期:1805±291;多尿期:1869±320;恢复期:2697±420,均P<0.01).结论 HRFS患者CD4+CD25+Foxp3+T细胞明显减少,这群调节性T细胞可能参与了HRFS的病理进程.