革兰氏阴性、阳性菌感染后外周血单个核细胞TLR4、TLR2的表达

目的:研究革兰氏阴性菌(G- 菌)、革兰氏阳性菌(G+ 菌)感染患者与正常人外周血单个核细胞Toll样受体4(TLR4 )mRNA、TLR2mRNA的表达情况。方法:提取经检验科体液镜检或培养阳性,证实为G- 菌、G+ 菌感染患者35例,正常对照2 4例。运用Taqman实时定量PCR方法测定G- 菌、G+ 菌感染患者外周血单个核细胞的TLR4mRNA、TLR2mRNA并测定表达水平,正常人作为对照。结果:G- 菌感染患者较正常对照和G+ 菌感染外周血单个核细胞TLR4mRNA表达显著升高(P <0 .0 1) ;G- 菌感染伴发热较不伴发热患者TLR4表达显著升高(P <0 . 0 1)。G+ 菌感染患者TLR4表达与正常对照无显著差异(P>0 .0 5 )。G+ 菌、G- 菌感染患者和正常对照之间TLR2mRNA表达无显著差异(P >0 . 0 5 )。结论:TLR4在G- 菌感染患者外周血单个核细胞中表达升高,在G- 菌感染伴发热的患者中升高尤为显著,表明TLR4是G- 菌的识别受体。在临床上当G- 菌感染尚未或不能证实时,可通过TLR4mRNA表达水平的检测,为患者是否存在G- 菌感染提供依据。

Expression of TLR4 and TLR2 mRNA in the peripheral blood mononuclear cells of the patients with Gram negative or Gram positive infections

Objective:To investigate the expression of TLR4 mRNA?TLR2 mRNA in the peripheral blood mononuclear cells (PBMC) from the patients with Gram positive and Gram negative infections.Methods:TLR4 and TLR2 mRNA were detected in the patients with Gram negative infections ( n =20) and the patients with Gram positive infections ( n =15) and the normal persons as control ( n =24) with the method of Taqman Real-time PCR.Results:TLR4 mRNA expression in the patients with Gram negative infections were significantly higher than Gram positive infections patients and the normals ( P <0.01).Especially,TLR4 were much higher in Gram negative infections patients with fever than those without fever ( P <0.01).But there was no significant difference in the level of TLR2 mRNA between either the Gram negative infections or the Gram positive infections patients and the normals ( P >0.05).Conclusion:The results showed that the increased expression levels of TLR4 mRNA in PBMC from the Gram negative infectious patients are associated with Gram negative infections and the detection of TLR4 mRNA expression may be a method of diagnosis for Gram negative infections in the early stage.