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目的:观察病毒性心肌炎(viral myocarditis,VMC)患者外周血中CD4+ CD25+GARP+调节性T细胞的数量和功能变化,以探讨VMC发病的免疫病理机制.方法:选取急性VMC患者25例(VMC组)及与其年龄匹配的健康志愿献血者25例(对照组),采用流式细胞术检测VMC患者外周血中CD4+ CD25+ GARP+调节性T细胞的百分率;实时荧光定量RT-PCR检测FOXP3、GARP以及相关炎性因子的变化;酶联免疫吸附试验(ELISA)检测血清中IFN-γ和IL-17的水平.结果:VMC组与对照组相比,外周血中CD4+ CD25+调节性T细胞的比例并未出现明显变化,而CD4+ CD25+ GARP+调节性T细胞的百分率明显下降,GARP的mRNA表达量也较对照组下降,而IL-17和IFN-γ的mRNA表达却显著升高,同时VMC组患者血清中的IFN-γ和IL-17的表达水平却明显高于对照组.结论:CD4+ CD25+ GARP+调节性T细胞在急性VMC患者外周血中的数量和调节功能受到损伤.“,”Objective:To observe the quantitative and functional changes of CD4+ CD25+ GARP+ regulatory T cells in peripheral blood of patients with viral myocarditis (VMC).Method:Twenty-five VCM patients and 25 controls were enrolled in this study.Percentages of CD4+ CD25+ GARP+ regulatory T cells were determined by flowcytometry.The expression levels of FOXP3、GARP and relative inflammatory factor were detected by RT-PCR,and the concentrations of IL-17、IFN-γ were determined by ELISA.Result:The percentage of CD4+ CD25+ regulatory T cells showed no significant difference between VMC patients and control groups,but the percentage of CD4+ CD25+ GARP+ regulatory T cells was lower in VMC patients.The mRNA expression of GARP was also lower in VMC patients compared to the control group,however,the mRNA expression of IL-17 and IFN-γ were obviously higher in VMC patients.Additionally,the expression levels of IL-17 and IFN-γ were increased in the plasma of VMC patients.Conclusion:The number and function of CD4 + CD25 + GARP+ regulatory T cells are compromised in VMC patients.