系统性红斑狼疮病人外周血白细胞TNFRSF12mRNA表达的研究

Study on mRNA expression of TNFRSF12 in peripheral blood leukocytes of SLE patients

目的 :了解肿瘤坏死因子受体超家族成员 12 (TNFRSF12 )mRNA在系统性红斑狼疮 (SLE)外周血白细胞中的表达是否异常 ,初步判断TNFRSF12是否为SLE的易感基因。方法 :采用TaqManone stepRT PCR方法 ,分别对SLE病人、正常人和类风湿性关节炎 (RA)病人外周血白细胞TNFRSF12mRNA的表达进行检测。结果 :SLE病人TNFRSF12mRNA的表达形式与表达量和正常人相比均存在差异 ,SLE病人白细胞存在TNFRSF12mRNA的两类形式剪切体 ,分别为编码膜结合蛋白形式和分泌形式的TNFRSF12 ,而正常人只有后者 ,在PHA刺激后才开始同时表达前者。并且TNFRSF12mRNA在SLE病人中的表达量与病情活动度和肾脏累及相关。结论 :提示TNFRSF12在SLE的发病机制中起一定作用 ,因此可能是SLE的易感基因。

Objective:To explore whether the mRNA expression of TNFRSF12 in peripheral blood leukocytes of SLE patients is abnormal and to determine whether the TNFRSF12 gene is susceptibility gene to SLE.Methods:The level of mRNA expression of TNFRSF12 in peripheral blood leukocytes was detected by TaqMan one-step RT-PCR method.Results:The mRNA expression pattern in SLE patients is different to that of normal control.The mRNA in SLE consists of 2 types of isoforms of TNFRSF12,encoding membrane bound glycoprotein and potentially secreted molecules respectively,whereas only the latter in normal control.After PHA treatment,the mRNA expression pattern in normal control becomes the same as that of SLE patients.Overall TNFRSF12 mRNA expression was significantly decreased in active SLE group and significantly increased in lupus nephritis group.Conclusion:The results indicated that TNFRSF12 may play a role in the pathogenesis of SLE and was susceptibility gene to SLE.