骨髓增生异常综合征淋巴细胞亚群及其激活状态的分析

本研究探讨骨髓增生异常综合征（MDS）患者外周血T细胞亚群，B细胞，NK细胞数量及激活状态的临床意义．采用流式细胞术对30例MDS患者外周血T细胞，B细胞，NK细胞及其表面活化分子CD28，CD45RA，CD45RO，CD69，HLA—DR的表达进行检测和分析。30例MDS患者中低危组（RA＋RAS）22例，高危组（RAEB＋RAEBT）8例。结果表明：MDS组T细胞（CD3^＋细胞）的百分率低于正常对照组，CD4^＋CD45RA^＋细胞（未致敏CD4^＋细胞）的数值低于正常对照组。MSD组早期活化T细胞（CD3^＋CD69^＋细胞）和晚期活化T细胞（CD3^＋HLA—DR^＋细胞）的数值均显著高于正常对照组。低危组（RA和RAS）主要表现为T细胞活化功能的改变：早期活化T细胞（CD3^＋CD69^＋细胞）和晚期活化T细胞（CD3^＋HLA—DR^＋细胞）比例均增高，以及B细胞数量的减少。高危组（RAEB和RAEBT）主要表现为T细胞亚群数量的改变：CD3^＋细胞，CD3^＋CD4^＋CD8^-细胞（T辅助细胞）数量的减少，CD3^＋细胞HLA—DR和CD69的表达并不增高。NK细胞数量减少。结论：MDS病人存在有T细胞数量和功能的异常，且随着病情的进展而发生改变，所以T细胞亚群及活化功能的检测对于判断疾病的进程和指导治疗具有重要的意义。

Evaluation of the Subsets of Lymphocytes and Their Activated Status in Patients with Myelodysplastic Syndrome

This study was purposed to investigate the clinical significance of the amount and activated status of T cell subsets, B cells, NK cells in peripheral blood from patients with myelodysplastic syndrome (MDS). The proportion of T cells, B cells, NK cells in peripheral blood from 30 patients with MDS and their surface activation markers of CD28, CD45RA, CD45RO, CD69, HLA-DR were analyzed by flow cytometry. Twenty-two patients were in the low risk group (RA+RAS) while eight patients were in the high risk group (RAEB+RAEBT). The result showed that the amounts of T cells (CD3+cells) in peripheral blood from patients with MDS were lower than those in control group .The amounts of naived CD4+ cells (CD4+CD45RA+ cells) in MDS patients were lower than those in control. The expression rates of early activation marker (CD69) and late activation marker (HLA-DR) on CD3+ cells in MDS patients were significantly higher than those in control. The abnormalities of the immunologically competent cells were mainly observed in the low risk group (RA+RAS), and were characterized by the high expression rates of CD69+ and HLA-DR+ on CD3+cells, the decrease of B cell amounts. The amount abnormalities of T cell subsets were mainly observed in high risk group (RAEB+RAEBT), and were characterized by the decrease of CD3+ cells and CD3+CD4+CD8-cells (Th cells) amounts without high expression of the CD69 and HLA-DR, the decrease of NK cells amounts. It is concluded that there are the abnormalities of T cell subsets and function in the patients with MDS and may change with disease progression, so the measurement of amonnt and activated status of T cell subsets in peripherat blood from MDS patients can have predictive role for diagnosis of disease progression and guide of therapy.