CpG寡核苷酸对人外周血单个核细胞的免疫刺激作用

目的　观察CpGODN、GM CSF、CD40 L对正常人外周血单个核细胞 (PBMC)的免疫刺激作用 ,以期筛选出一种高效的疫苗佐剂。方法　用CpGODN 2 0 0 6、GM CSF、CD40 L刺激正常人PBMC ,48h后采用ELISA法检测培养上清液中IFN γ、IL 12及IL 10水平 ;应用免疫荧光法检测PBMC上CD40、CD86、HLA DR的表达。结果　CpGODN 2 0 0 6能诱导正常人PBMC分泌较高水平的IL 12、IFN γ ,抑制IL 10的分泌 ;上调PBMCCD40、CD86、HLA DR表达的作用最强。结论　CpGODN 2 0 0 6是一种免疫刺激作用强大的新型佐剂 ,可用于多种疫苗的制备。     

The effects of Fumaderm(R) on immunological function and cytokines in a rat model of adjuvant-induced arthritis

Objective To study the therapeutic effect of Fumaderm in Freund' complete adjuvant-induced arthritis (AIA) in Spraque-Dawley rats. Methods Adjuvant-induced arthritis (AIA) was established by intradermal injection of 0.1 mL of Freund' complete adjuvant (CFA) in the palmar surface of the right hindpaw and Fumaderm was delivered by oral gavage for 28 days. After CFA injection, the edema of the hindpaw was determined every two days. On 28 days after CFA injection, the lymphocyte subsets of peripheral blood and the cytokines were determined by flow cytometry, meanwhile the histopathological examination of ankle-joints of the animals was performed. Results Fumaderm had a significant therapeutic effect on AIA. The hindpaw swelling was reduced significantly in a dose-dependent manner. The ratio of peripheral blood T lymphocytes was improved obviously. Multiparameter cytokine analysis from peripheral blood CD4+ T cells showed a decrease of proinflammatory cytokines and an increase of anti-inflammatory cytokines in Fumaderm treated animals. A strongly reduced inflammatory response in the joint synovium was observed. Conclusion Fumaderm has potential anti-inflammatory effects on AIA rats. Further investigation is needed to elucidate the molecular mechanism involved in the clinical effect observed in the AIA model.     

降植烷通过内质网应激诱导大鼠巨噬细胞自噬

目的 探讨佐剂降植烷诱导自噬增强的确切机制。方法 构建降植烷刺激的大鼠巨噬细胞系模型;Western blotting检测细胞模型能量代谢分子腺苷酸活化蛋白激酶（AMPK）、哺乳动物雷帕霉素靶蛋白（mTOR）及内质网应激通路真核起始因子2α(eIF2α)和肌醇依赖酶1α(IRE1α)的表达与活化,及转录因子EB(TFEB)的表达及入核情况;采用二硫苏糖醇（DTT）、4-苯基丁酸（4-PBA）调控细胞内质网应激水平并观察对mTOR表达和细胞自噬的影响。结果 降植烷刺激的NR8383细胞模型中,eIF2α在刺激0.5 h活化,mTOR表达在刺激后1、3 h较对照组（0 h）显著降低,AMPK及IRE1α无明显变化。降植烷刺激的NR8383细胞模型的mTOR表达下调,在4-PBA干预时表达回升,而增强的LC3-II表达受到抑制;在DTT干预细胞模型时,mTOR表达则进一步下调,同时LC3-II表达则更高。降植烷诱导细胞的TFEB表达升高并活化入核。结论 降植烷可能通过诱导内质网应激实现巨噬细胞自噬增强。     

Toll样受体4在佐剂性关节炎模型大鼠外周血单核细胞中的表达及意义

目的研究佛氏完全佐剂性关节炎(AIA)大鼠外周血单核细胞(PBMC)对Toll样受体4(Toll-like receptor 4,TLR4)、TLR4 mRNA的表达及其与关节炎评分的关系。方法流式细胞仪测定CD14 TLR4 细胞占CD14 细胞的比例和TLR4-PE的平均荧光强度(MIF);Northern blot法测定PBMC TLR4 mRNA的表达量。比较造模后15 d与正常对照组和造模后25 d时CD14 TLR4 /CD14 、MIF及其TLR4 mRNA表达量的差异,并用Mann-WhiteyU检验分析关节炎评分与TLR4 MIF的相关性。结果在造模后15 d,CD14 TLR4 /CD14 、TLR4 MIF和PB-MC TLR4 mRNA的表达较正常对照组和造模后25 d明显增高(P<0.01),而且TLR4 MIF与关节炎的评分有明显的相关性(15 d:r=0.826,P<0.01;25 d:r=0.688,P<0.05)。但造模后25 d,CD14 TLR4 /CD14 、TLR4 MIF和PBMC TLR4 mRNA的表达与正常对照组和造模前相比无统计学意义(P>0.05)。结论TLR4与AIA发病有密切关系,提示固有免疫反应在类风湿性关节炎(RA)及其他自身免疫性疾病的发病中有重要的作用。