SARS患者T淋巴细胞亚群的动态改变

目的研究严重急性呼吸综合征(severeacuterespiratorysyndrome,SARS)患者T淋巴细胞亚群动态变化的特点。方法收集本院确诊的46例SARS患者在发病后不同时间的抗凝血,用特异性荧光抗体标记,通过三色流式细胞仪检测其T淋巴细胞亚群、CD4+纯真细胞亚群(CD4+CD45RA+CD62L+)和CD8+激活亚群(CD8+CD38+),以56例健康献血员的结果作为正常人对照。结果与正常对照相比,SARS患者的CD4+细胞和CD8+细胞在感染1周内百分比正常,但计数均显著减少,分别为(306±140)/mm3和(270±143)/mm3,CD4+纯真细胞亚群的计数也明显降低至(96±49)/mm3,CD8+CD38+激活亚群的比例则明显升至(59.3±12.6)%犤正常人为(44.9±12.5)%犦。感染3～5周时,CD8+细胞计数和激活亚群的百分比均恢复正常,分别为(581±356)/mm3和(40.1±17.6)%。感染8～12周时,CD4+细胞和CD4+纯真细胞亚群的计数分别为(578±193)/mm3和(176±64)/mm3,仍低于正常水平,但与感染1周时相比均有异常显著的升高。结论SARS患者的T淋巴细胞免疫在细胞数量上严重受损,但在短期内有很明显的恢复,CD4+细胞和纯真CD4+细胞亚群的恢复需要比8～12周更长的时间。

Dynamics of T lymphocyte subsets in SARS patients

OBJECTIVE: To study dynamics of T lymphocyte subsets in severe acute respiratory syndrome (SARS). METHODS: Sequential anti-coagulated blood samples were collected from 46 cases of SARS patients during the 1st week, the 2nd week, the 3rd-5th week and the 8th-12th week after the infection. T lymphocyte subsets including CD3+CD4+ cells, CD3+CD8+ cells, naive CD4+ cells (CD4+CD45RA+CD62L+) and activated CD8+ cells (CD8+CD38+) were detected by 3-color flow cytometry. Fifty-six normal healthy blood donors were also detected as normal controls. RESULTS: Compared with the results of normal controls, both of the percentages of CD4+ cells and CD8+ cells of SARS patients were in normal levels during the 1st week, but the cell counts decreased significantly to (306 +/- 140)/mm3 and (270 +/- 143)/mm3, respectively. The cell count of naive CD4+ subset also remarkably decreased to (96 +/- 49)/mm3, and the percentage of CD8+CD38+ subset was higher than that of normal controls (59.3 +/- 12.6)% vs (44.9 +/- 12.5)%]. During the 3rd-5th week, the CD8+ cell count and the percentage of CD8+CD38+ subset reached normal values, which were (581 +/- 356)/mm3 and (40.1 +/- 17.6)%, respectively. During the 8th-12th week, the cell counts of CD4+ cell (578 +/- 193)/mm3] and naive CD4+ subset (176 +/- 64)/mm3] were still less than those of normal controls, while compared with those of the 1st week, the increments were remarkable. CONCLUSIONS: T lymphocytes of SARS patients decreased dramatically but could be obviously resumed in a short time. It will take more than 8-12 weeks for CD4+ cell and naive CD4+ subset to reach to normal levels.