Toll样受体2在原发免疫性血小板减少症中的作用研究

本研究通过检测原发免疫性血小板减少症（ITP）患者外周血淋巴细胞中TLR2的表达,同时评价体外活化TLR2对炎症因子分泌的影响,旨在探讨TLR2在ITP发病机制中的作用.39例ITP患者及21例正常对照者纳入本研究.应用实时定量PCR及流式细胞术检测外周血单个核细胞（PBMNC）中TLR2的表达.采用pam3CSK4体外刺激活化PBMNC,48 h后检测细胞培养上清中IL-6及TNF-α的浓度.结果显示,活动期ITP患者PBMNC中TLR2 mRNA的表达显著高于正常对照（3.561±0.741 vs 1.750±0.314） （P ＜0.05）,而缓解组（2.333±0.448）和正常对照之间TLR2 mRNA差异无统计学意义（P＞0.05）.流式细胞术分析显示,TLR2在正常对照及ITP患者T、B细胞表面不表达,但表达于所有单核细胞表面.进一步体外实验发现,TLR2活化能诱导ITP患者PBMNC中IL-6（1644±634.0 vs 4111±525.2 pg/ml）及TNF-α （75.37±22.31 vs 326.0±109.9 pg/ml）的表达（P均＜0.05）,但仅对正常对照PBMNC中IL-6（2119±636.9 vs4671±315.9 pg/ml） （P＜ 0.05）的分泌有促进作用.结论：TLR2mRNA在ITP患者PBMNC中高表达,这些高表达的TLR2可能通过促进炎症因子的分泌加快ITP疾病进程.

Role of Toll-Like Receptor 2 in Primary Immune Thrombocytopenia

The aim of this study was to explore the role of Toll-like receptor （TLR） 2 in primary immune thrombocytopenia （ITP） by detecting TLR2 expression in the peripheral blood lymphocytes of patients with ITP and evaluating the role of TLR2 activation on inflammatory cytokine secretion. A total of 39 ITP patients and 21 normal controls were enrolled in this study. The expression of TLR2 was detected by real-time PCR and flow cytometry, and the concentration of IL-6 and TNF-α in culture supernatant of PBMNC treated with pam3CSK4 for 48 hours were detected by ELISA. The results showed that the expression of TLR2 rnRNA in active ITP patients （3. 561 ±0. 741 ） was significandy higher than that in normal controls （1. 750 ± 0. 314 ） （P 〈 0.05 ）, but there was no statistically significant difference between remission ITP patients （ 2.333 ± 0.448 ） and normal controls （ P 〉 0.05 ） . Flow cytometry analysis found that the TLR2 was not expressed on T and B cells, but expressed on all monocytes both from ITP patients and normal controls. Further activation experiment showed that TLR2 activation in vitro could induce the expression of IL-6 （ 1644 ± 634.0 vs 4111 ±525.2 pg/ml） and TNF-α （75.37 ±22.31 vs 326.0 ± 109.9 pg/ml） in PBMNC from ITP patients （ both P 〈 0. 05 ）, but just could promote IL-6 expression in normal controls （2119 ± 636.9 vs 4671 ± 315.9 pg/ml） （ P 〈 0.05）. It is concluded that the expression of TLR2 mRNA is up-regulated in PBMNC of ITP patients, and this increased TLR2 maybe participate in ITP through inducing secretion of inflammatory cytokines.