狼疮肾炎患者外周血单核细胞表达有功能的Fas

目的 探讨狼疮肾炎（ＬＮ）患者单核细胞凋亡加速的机制。方法 对灯例ＬＮ患者进行观察及以 １５例正常人为对照。采用流式细胞仪检测单核细胞 ＦａＳ和 Ｆａｓ Ｌｉｇａｎｄ（ＦａｓＬ）的表达；单核细胞与重组人ＦａＳＬ共孵育，碘化丙啶染色、流式细胞仪检测单核细胞凋亡，四甲基偶氮唑蓝（ＭＴＴ）法观察单核细胞体外存活率。结果ＬＮ患者单核细胞Ｆａｓ的表达较正常人明显上调（Ｐ＜０．０５）；处于狼疮活动期的ＬＮ患者与狼疮静止期的ＬＮ患者之间Ｆａｓ的表达差异无显著性意义（Ｐ＞０．０５）。正常人和ＬＮ患者的单核细胞表面均未检测出ＦａｓＬ的表达。单核细胞与重组人ＦａｓＬ在体外共同培养２ｈ后，ＬＮ者单核细胞的凋亡较正常人明显增加（Ｐ＜０．０５），单核细胞与重组人 ＦａｓＬ在体外共同培养６ｈ后，ＬＮ患者单核细胞的存活率较正常人明显低下（Ｐ＜０．０５）。结论 ＬＮ患者单核细胞表面功能性Ｆａｓ表达上调是ＬＮ患者单核细胞凋亡加速的可能机制。

Expression of functional Fas on monocytes in patients with lupus nephritis

Objective To elucidate the mechanism of accelerated apoptosis of monocytes in patients with lupus nephritis (LN). Methods 17 LN patients were enrolled in the study and 15 healthy volunteers were selected as controls. The expression of Faa and Fas ligand (FasL) was examined by immunofluorescent staining and flow cytometer analysis. The apoptosis and survival rate of monocytes cultured in vitro with human FasL (rHu-FasL) was analyzed by flow cytometer analysis and 5-diphenyl tetrazolium bromide (MTT) staining, respectively. Results Faa expression on monocytes was significantly higher in LN patients than that in healthy subjects. There was no difference of monocytes Fas expression between active LN patients and silent LN patients. There was no detectable FasL expression on monocytes from both LN patients and healthy controls. When monocytes cultured in vitro with rHu-FasL, there was a significantly increasing apoptosis and a decreasing survival rate of monocytes in LN patients as compared to healthy controls. Conclusion The up-regulated expression of functional Fas on monocytes may contribute to the accelerated apoptosis of monocytes in LN patients.