系统性红斑狼疮患者T细胞TCR/CD3复合物介导的信号传导研究

目的：证实系统性红斑狼疮（SLE）患者T细胞功能异常是否与其生物化学信号传导异常有关。方法：用CD3单抗与羊抗鼠二抗IgG相交联刺激T细胞并用Thapsigargin和依地酸（EGTA）干预后，分别用粘附细胞仪连续观察10min T细胞[Ca^2 ]i的变化，并评价[Ca^2 ]i反应与CD3分子和三磷酸肌醇（InsP3）生成量的相关性。结果：正常人和SLE患者T细胞[Ca^2 ]i反应的基准值相似（P＝0．105）；SLE患者高峰者，平台值T细胞的[Ca^2 ]i反应明显高于正常对照（P＜0．001，P＜0．001），加入Thapsigargin后二者[Ca^2 ]i反应差异无显著性，而加入EGTA后二者[Ca^2 ]i反应差异有显著性，二者的T细胞CD3阳性率和InsP3生成量差异无显著性（P＝0．665，P=0．537）。结论：SLE患者T细胞TCR／CD介导的信号传导途径存在异常，SLE患T细胞功能异常可能是因细胞内生物化学信号传导途径异常所致。

TCR/CD3 complex-mediated signal transduction in T cells from patients with systemic lupus erythematosus

Objective To investigate whether systemic lupus erythematosus (SLE) T cell function disorder is related to abnormal biochemical pathways.Methods After cross linking of anti CD3 mAbs to sheep anti mouse IgG and stimulating T cells,the changes of free calcium ion within T cells and these changes under interference of Thapsigargin and EGTA were observed respectively for 10 minutes with an adhesion cytometry.The relation between [Ca 2+ ]i response in SLE T cells and expression of CD3 molecules,or InsP 3 levels was evaluated.Results The base [Ca 2+ ]i response in T cells of SLE patients was similar to that of normal control ( P =0 105).Peak and plateau [Ca 2+ ]i responses were significantly higher in the group of SLE patients ( P <0 001, P <0 001).[Ca 2+ ]i responses were similar in both groups after addition of Thapsigargin,and [Ca 2+ ]i responses of T cells from SLE patients in the presence of EGTA were higher.Percentages of CD3 + cells and InsP 3 generation were similar in both individuals ( P =0 665, P =0 537).Conclusion TCR/CD3 mediated [Ca 2+ ]i response in T cells from SLE patients is abnormal,and T cell function disorder existing in SLE is the by product of abnormal biochemical pathways.