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目的研究ＣＤ４＋Ｔ淋巴细胞的功能亚群在重症肌无力（ｍｙａｓｔｈｅｎｉａｇｒａｖｉｓ，ＭＧ）发病中的作用。方法采用免荧光双标记技术和流式细胞仪对３９例ＭＧ患者和１８例健康对照者周围血中ＣＤ４＋Ｔ淋巴细胞的两个亚群（ＣＤ４＋ＣＤ４５ＲＡ＋、ＣＤ４＋ＣＤ４５ＲＡ－）的百分率进行测定。结果ＣＤ４＋ＣＤ４５ＲＡ＋亚群的百分率在ＭＧ组和ＡＣｈＲＡｂ阳性组明显低于对照组和ＡＣｈＲＡｂ阴性组；而ＣＤ４＋ＣＤ４５ＲＡ－细胞的百分率在ＭＧ组和ＡＣｈＲＡｂ阳性组显著高于对照组和ＡＣｈＲＡｂ阴性组。结论表明ＣＤ４＋Ｔ淋巴细胞的两个功能不同亚群在ＭＧ患者体内发生了异常改变，与ＡＣｈＲＡｂ的产生有关。
Objective To study the function of CD4 + T lymphocyte subsets in the pathogenesis of myasthenia gravis (MG). Methods The percentages of CD4 + T lymphocyte subsets (CD4 + CD45RA +, CD4 + CD45RA-) in peripheral blood of 39 patients with MG and 18 healthy controls were determined by fluorescence-free double labeling and flow cytometry. Results The percentages of CD4 + CD45RA + subpopulation in MG and AChRAb positive groups were significantly lower than those in control and AChRAb negative groups. The percentage of CD4 + CD45RA- cells in MG and AChRAb positive groups was significantly higher than that in control and AChRAb negative groups. The results suggest that two different functional subsets of CD4 + T lymphocytes abnormally change in MG patients, which is related to the production of AChRAb.