摘要：目的 探讨治疗前后混合性结缔组织病外周T细胞亚群改变及共刺激分子的表达.方法 流式细胞仪检测初诊混合结缔组织患者及治疗后患者外周血T细胞表面标志CD3/CD4/CD8及CD28/CD152在外周血T淋巴细胞上的表达水平.结果 与初治组相比,共刺激分子CD28在CD4+T和CD8+T淋巴细胞上的表达均有明显降低(P＜0.05),CD152在CD4+T淋巴细胞上的表达有明显降低(P＜0.05),而CD152在CD8+T淋巴细胞上的表达增加(P＜0.05).结论 混合性结缔组织病患者T淋巴细胞亚群及共刺激分子异常表达可能与免疫功能紊乱及疾病发生发展有关. Abstract： Objective To investigate the changes of expression of costimulatory molecule on peripheral blood lymphocyte subpopulations inpreliminary -diagnosis and post- treatment patients with mixed connetive tissue disease.Methods The expression of costimulators CD28 /CD152 and marks of lymphocyte cell CD3/CD4/CD8 on lymphocyte subsets in inpreliminary -diagnosis and post -treatment patients with mixed connetive tissue disease was deter mined by flow cytometry.Results The CD28 expressed on CD4 + T and CD8 + T cells were significantly decreased(P ＜ 0.05)in post - treatment patients.The CD152expressed on CD8 +T cell was significantly decreased(P ＜ 0.05)in post- treatment patients,while CD152 expressed on CD8 +T was signifantly increased(P ＜ 0.05).Conclusions The changes of expression of costimulatory molecule on peripheral blood lymphocytes may play an important role in immune dysfunction of MCTD patients.

关键词：共刺激分子 混合性结缔组织病 患者 外周血淋巴细胞 异常表达 

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