实时定量PCR分析小鼠树突状细胞TLR4 mRNA表达及地塞米松的调节

目的: 建立检测小鼠Toll样受体4(TLR4)mRNA表达水平的SYBR GreenⅠ实时定量PCR实验; 观察小鼠骨髓源树突状细胞(DC)发育成熟过程中TLR4 mRNA表达水平的动态变化以及地塞米松(DEX)对DC TLR4 mRNA表达的影响.方法: (1)用细胞因子定向诱导的方法将小鼠骨髓细胞培养为DC; (2)构建pUCm-T/TLR4和pUCm-T/β-actin重组质粒, 建立检测小鼠TLR4 mRNA水平的实时定量PCR实验; (3)用实时定量PCR技术对体外培养4、 6、 8、 10、 12 d的DC TLR4 mRNA表达水平进行动态观察; (4)在DC培养体系中加入DEX, 与常规培养DC TLR4 mRNA表达水平进行比较.结果: (1)从小鼠骨髓细胞中成功诱导培养了DC, 经免疫磁珠纯化后其纯度可达90%以上; (2)建立了能精确分析小鼠TLR4 mRNA表达水平的SYBR GreenⅠ实时定量PCR实验; (3)在DC培养前期TLR4 mRNA表达水平变化不大, 后期则明显升高; (4)DEX可使DC TLR4 mRNA表达增强.结论: 小鼠骨髓源DC TLR4 mRNA表达水平与其发育成熟阶段密切相关; DEX促进DC TLR4 mRNA表达.

The analysis in the expression of Toll-like receptor 4 mRNA and the effect of dexamethasone on mice dendritic cells by real-time PCR

AIM: To establish a SYBR Green I quantitative real-time PCR method for detecting the expression of the TLR4 mRNA of mice and to monitor the dynamics for TLR4 mRNA level of mice bone marrow-derived dendritic cells (DC) in the process of the maturation and the effect of dexamethasone (DEX) on TLR4 expression. METHODS: (1) DC from mice bone marrow were induced by cytokines and separated by magnetic beads. (2) The combined plasmid pUCm-T/TLR4 and pUCm-T/beta-actin for the standard materials in the real-time PCR was reconstructed. (3) The dynamics for the express TLR4 mRNA of DC cultivated in vitro for 4, 6, 8, 10, 12 days was detected respectively. (4) The TLR4 mRNA expression between DC treated with or without DEX was detected and compared. RESULTS: (1) The DC with the purity over 90% were fully separated in success. (2) A SYBR Green I quantitative real-time PCR method for analyzing the TLR4 mRNA expression level of the mice was successful established. (3) TLR4 mRNA level was stable early during the culture of DC and then rise obviously at last. CONCLUSION: There exists a close relationship between the level of TLR4 mRNA and the period of maturation of DC and the expression of TLR4 could be increased by DEX.