目的：探讨肾移植排斥反应中促炎性细胞因子白细胞介素17（IL-17）和补体活化产物C5a的表达情况，以及C5a对IL-17表达的可能调节作用。方法流式细胞术（FCM ）检测肾移植患者外周血中IL-17＋ T细胞的频率和C5a刺激后人肾小管上皮细胞系中的 HK2细胞IL-17的表达情况；ELISA检测肾移植患者血清C5a水平的变化；免疫组织化学检测并比较正常肾组织和发生排斥反应移植肾组织中IL-17的表达和补体C5b-9的沉积；免疫细胞化学检测HK2细胞在重组C5a刺激前、后IL-17表达的差异。结果同种异基因肾移植术后，肾移植患者外周血中IL-17＋ T 细胞百分率明显升高，患者血清C5a水平较术前显著增加（P＜0．01）；发生排斥反应的肾组织中IL-17表达与C5b-9的沉积较正常肾脏组织均有明显的上调，二者呈正相关；加入重组的C5a刺激后，HK2细胞IL-17的表达水平显著上调。结论肾移植排斥反应中补体活化产物C5a可能对IL-17的产生起正向调节作用。%Objective To investigate the expression of proinflammatory cytokine interleukin-17(IL-17) and complement cleavage fragment C5a and the regulation effect of C5a on the expression of IL-17 during renal allograft rejection .Methods The frequency of IL-17+ T cell in peripheral blood and the expression of IL-17 in renal tubular epithelial cells (HK2) after C5a stimulation in renal transplant recipients were measured by flow cytometry and the changes of serum C5a level was detected by ELISA ,respectively .Im-munohistochemistry was applied to detect and compare the expression of IL-17 and the deposition of C5b-9 in normal renal tissues and renal tissues with allograft rejection .The difference of IL-17 expression in HK2 cells before and after the recombinant C5a stimulation was detected by immunocytochemistry .Results Both the percentage of IL-17+ T cells and serum C5a levels were sig-nificantly increased after the allogeneic renal transplantation .Compared with normal renal tissues ,both the deposition of C5b-9 and the IL-17 expression in renal tissues with allograft rejection was remarkably up-regulated ,which showed the positive correlation be-tween them .The expression of IL-17 in HK2 was obviously up-regulated by the recombinant C5a stimulation .Conclusion C5a may positively regulate the expression of IL-17 by tubular epithelial cells during the renal allograft rejection .
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