长期随访的严重急性呼吸综合征患者T淋巴细胞亚群动态变化

目的研究严重急性呼吸综合征(SARS)患者外周血T淋巴细胞亚群的动态变化,探讨SARS的发病机制。方法对62例SARS冠状病毒IgG抗体阳性患者进行为期1年的随访,采集患者发病后1周、2周、1月、2~3月及1年时的外周静脉血,采用流式细胞仪检测T细胞、CD4 T和CD8 T细胞、纯真及记忆CD4 T细胞亚群。并以56例健康者作为对照。结果SARS患者外周血淋巴细胞亚群在康复后短期内有明显恢复。在发病2~3月时,CD8 T细胞数与正常对照相比差异无显著性,平均CD4 T细胞及纯真CD4 T细胞数已分别增加至(534±197)/mm3和(175±75)/mm3。但发病1年时淋巴细胞总数、T细胞、CD4 T细胞和纯真CD4 T细胞数仍低于正常对照组。结论SARS患者外周血T淋巴细胞亚群表现为可逆的一过性快速减少及恢复。

Dynamic changes of T lymphocyte subsets in the long-term follow-up of severe acute respiratory syndrome patients

OBJECTIVE: To study the dynamic changes of T lymphocyte subsets in severe acute respiratory syndrome (SARS) patients. METHODS: Sequential anti-coagulated blood samples were collected from 62 seropositive SARS patients during the first week, the second week, the first month, the 2nd-3rd month, and 1 year after disease onset. T-lymphocyte subsets including CD4 + T cells, CD8 + T cells, and naive and memory CD4 + T cells were detected by flow cytometry. Samples from 56 healthy blood donors were also detected as healthy controls. RESULTS: A rapid restoration in T-lymphocyte subsets was observed during a short period after infection. During the 2-3 months after disease onset, CD8 + T cell count returned to the normal level. At the same time point, CD4 + T cell and naive CD4 + T cell counts increased to (534 +/- 197)/mm3 and (175 +/- 75)/mm3 respectively. Total lymphocytes, T lymphocyte, CD4 + T and naive CD4 + T cell were still significantly lower than the normal levels even one year after disease onset. CONCLUSION: The periphery T lymphocyte subsets in SARS infection shows transient decrease and then rapid recovery.