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。     

系统性红斑狼疮患者外周血单个核细胞中IL—4和IL—13 mRNA的表达

目的探讨Th2型细胞因子在系统性红斑狼疮(SLE)发病机制中的作用及其意义.方法应用逆转录-聚合酶链反应(RT-PCR)检测了34例活动期SLE患者和30例正常人外周血单个核细胞(PBMC)中IL-4和IL-13mRNA的表达水平.结果活动期SLE患者IL-4和IL-13的阳性表达率与正常人对照组相比均无明显差异(P>0.05);活动期SLE患者PBMC中IL-4和IL-13mRNA的平均表达水平(0.938 6±0.168 9,0.898 3±0.115 3)均明显高于正常人对照组(0.5494±0.151 0,0.608 5±0.090 3),差异非常显著(P<0.001).结论Th2型细胞因子IL-4和IL-13在SLE患者中呈高水平表达,这可能与SLE患者外周血T细胞高度活化、功能异常有关.     

磷酸二酯酶抑制剂对慢性阻塞性肺疾病患者PBMC中IL-8mRNA表达的影响

目的:探讨磷酸二酯酶(PDE)抑制剂对慢性阻塞性肺疾病(COPD)患者外周血单个核细胞(PBMC)IL-8mRNA表达的影响及机制。方法:采集20例急性发作期COPD患者(A组)和15例正常人(B组)的PBMC。A组的每份PBMC分4组培养:A1组为空白对照,A2组和A3组分别加入100μmol/L及1mmol/L的非选择性PDE抑制剂茶碱,A4组加入选择性PDEⅣ抑制剂Rolipram。应用RT-PCR检测IL-8mRNA的表达,以免疫组化法检测NF-κB阳性细胞的百分率,用Westernblot检测I-κB蛋白的含量。结果:(1)A1组PB-MC中IL-8mRNA的表达及NF-κB阳性细胞的百分率,均显著高于B组;IκB的水平显著低于B组(P<0.01)。(2)与A1组比较,A2组和A3组的PB-MC中IL-8mRNA的表达无显著差异(P>0.05);A4组IL-8mRNA的表达明显下降(P<0.01)。(3)与A1组比较,A2组NFκB阳性细胞的百分率及IκB的水平无显著差异(P>0.05);而A3组的PBMC中NFκB阳性细胞的百分率下降(P<0.05),IκB蛋白的水平无显著变化(P>0.05)。A4组PB-MC中,NF-κB阳性细胞的百分率较A1组明显下降,I-κB蛋白的水平明显增加(P<0.01)。结论:COPD患者PBMC中IL-8mRNA的表达较正常增高,提示IL-8参与了COPD的发病过程;选择性PDEⅣ抑制剂Roli-pram可抑制IL-8基因的表达,其作用机制可能与NF-κB阳性细胞百分率的下降有关。非选择性PDE抑     

早期自然流产患者TNF-α mRNA的异常表达

目的探讨自然流产患者外周血单个核细胞内肿瘤坏死因子-α mRNA的异常表达.方法采用半定量逆转录-聚合酶链反应(RT-PCR)技术,检测30例早期自然流产患者、25例正常妊娠妇女、25例正常未妊娠妇女外周血单个核细胞内TNF-α mRNA.结果早期自然流产患者、正常妊娠妇女、正常未妊娠妇女三组研究对象外周血单个核细胞表达TNF-α mRNA相对含量分别为20.1±9.4%、68.6±14.1%、97.0±11.6%.结论早期自然流产患者外周血单个核细胞TNF-α mRNA表达水平显著下降,提示流产过程中能分泌TNF-α的单个核细胞可能聚集于母胎界面,TNF-α可能在母胎界面局部发挥作用并导致流产.     

Interleukin-4 gene expression in human peripheral blood mononuclear cells

Interleukin-4 (IL-4) mRNA was detected in normal human peripheral blood mononuclear cells (PBMC) stimulated with concanavalin A by Northern blot analysis. The signal was undetectable in PBMC before the stimulation, but became detectable 3 hrs after the stimulation and reached a maximum in 3-6 h and disappeared gradually thereafter. Immunosuppressive drugs such as ciclosporin, hydrocortisone and prednisolone inhibited the IL-4 mRNA expression dose dependently. Interferon-gamma did not show any inhibitory effect on IL-4 gene expression.     

Interferon-gamma mRNA expression from peripheral blood mononuclear cells in hepatitis C virus infection: relation to viremia and combined peginterferon ribavirin response

It would be most helpful to identify serological markers associated with poor treatment outcome at baseline or in the early phase of therapy in order to spare unnecessary side effects of an expensive antiviral therapy (ribavirin and peginterferon). We hypothesized that pretreatment gamma-interferon gene expression level in peripheral blood mononuclear cells (PBMCs) and its protein could be used to predict treatment outcome (responders and nonresponders) in Egyptian HCV patients. This study involved 29 HCV subjects; they were classified after the 24 weeks of a treatment regimen (ribavirin and peginterferon) into two groups (16 patients with nondetectable HCV classified as responders and 13 HCV patients who had detectable HCV classified as nonresponders). Baseline interferon-gamma (IFN-γ) gene expression and glyceraldehyde-3-phosphate dehydrogenase (GAPDH) as a housekeeping gene were measured by real-time polymerase chain reaction (RT-PCR) methods using Syber Green method. Serum interferon-gamma level was determined by an ELISA (Enzyme-Linked Immunosorbent Assay). It is shown that 7/13 (54%) of nonresponders and 2/16 (13%) of responders showed elevated blood IFN-gamma mRNA levels prior to the therapy (p?<?0.05). Serum interferon-gamma level in the nonresponder group was undetectable compared with the responder group (p?<?0.01). There was no correlation between IFN-gamma expression levels, stage of fibrosis, viral load level nor serum interferon-gamma level. An interferon-gamma gene expression cutoff level of 0.54 at baseline (before starting the treatment regimen) can discriminate patients with response from patients with failure of response. IFN-gamma was higher in PBMCs of nonresponders when compared to responders and that measuring IFN-gamma can be used in patients infected with chronic hepatitis C to predict treatment failure.     

系统性红斑狼疮患者外周血单个核细胞中白细胞介素-10mRNA表达的研究

目的 探讨白细胞介素(IL-10)在系统性红斑狼疮(SLE)中的作用。方法 采用逆转录多聚酶链反应(RT-PCR)及酶联免疫吸附法(ELISA)测定40例SLE患者和20例正常对照组外周血单核细胞(PBMC)IL-10mRNA表达及IL-10自发分泌水平。结果 SLE患者PBMC自发分泌IL-10水平及其IL-10mRNA表达水平均显著高于正常对照组(P<0.01),其中SLE活动期明显高于非活动期(P<0.01),而非活动期又明显高于正常对照组(P<0.01)。结论 IL-10在SLE发病中起重要作用,PBMC分泌IL-10水平对SLE诊断和病情活动性监测有重要临床意义,拮抗SLE患者体内IL-10水平,将为SLE治疗开辟一条新途径。     

Purification of human interleukin 2 produced from normal human peripheral blood mononuclear cells

We have developed a simple protocol for the routine purification of essentially homogeneous human interleukin 2. The procedures applied include ammonium sulfate precipitation, ACA-54 gel filtration, ultrafiltration and chromatofocusing. The product has a molecular weight of 14 000, as determined by electrophoretic mobility, and is free of interleukin 1, interferon, granulocyte and monocyte stimulating factors, B cell growth factor and phytohemagglutinin. The method is efficient, rapid and reproduceable and provides a helpful method for preparation of IL-2 for biochemical and biological studies at moderate cost and without the use of complex equipment.     

帕金森病人外周血单个核细胞分泌IL-2的实验研究

目的 探讨帕金森病病人中外周血单个核细胞(PBMC)分泌IL-2的能力.方法 采用酶联免疫吸附法(ELISA)分别检测体外培养的PBMC上清液、及PBMC接受刀豆蛋白(ConA)刺激后上清液中IL-2含量.结果 PD Ⅰ期患者中未受刺激的PBMC分泌的IL-2显著高于PDⅡ-Ⅲ期患者(P＜0.05),接受ConA刺激后,以PD Ⅱ-Ⅲ期患者的PBMC生成IL-2最低,显著低于正常对照组(P＜0.05),刺激后同刺激前相比各组IL-2都有升高,但仅健康对照组刺激前后有显著差异(P＜0.05).结论 帕金森病患者的外周血单个核细胞的分泌IL-2能力存在异常.     

过敏性紫癜患儿外周血单核细胞TLR2表达及与免疫应答的相关性

背景：Toll样受体及其信号通路在自身免疫性疾病、超敏反应、炎症反应、细胞凋亡及移植排斥反应中发挥重要的作用,其在过敏性紫癜患儿免疫发病机制中的地位尚未完全阐明。目的：探讨过敏性紫癜患儿外周血单核细胞TLR2的表达及其与免疫应答的相关性。方法：64例过敏性紫癜患儿分为2组,即过敏性紫癜无肾损害组(36例)、过敏性紫癜肾损害组(28例),选择同期入院的30例健康体检儿童设置为对照组,采用流式细胞术检测外周血单核细胞TLR2表达,荧光定量PCR技术检测外周血单核细胞TLR2 mRNA相对表达量, ELISA检测血浆干扰素γ、白细胞介素4水平, ELISA法测定Treg细胞分泌的转化生长因子β、白细胞介素10水平。结果与结论：过敏性紫癜组干扰素γ、干扰素γ/白细胞介素4水平均显著低于对照组(P < 0.05),白细胞介素4水平显著高于对照组(P < 0.05);过敏性紫癜组TLR2 mRNA和蛋白表达显著高于对照组(P < 0.05);过敏性紫癜肾损害组TLR2 mRNA和蛋白表达显著高于过敏性紫癜无肾损害组(P < 0.05);过敏性紫癜组患者白细胞介素10和转化生长因子β表达显著高于对照组(P < 0.05)。结果表明过敏性紫癜患儿外周单核细胞TLR2 mRNA及蛋白表达增高,且患儿存在免疫表达失衡现象,TLR2参与过敏性紫癜免疫发病机制,转化生长因子β表达量能够评估Treg的免疫应答,可作为过敏性紫癜患儿诊断、治疗及预后参考依据。 中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

IL-4 is more effective than IL-13 for in vitro differentiation of dendritic cells from peripheral blood mononuclear cells

Dendritic cells (DCs) are the most potent professional antigen-presenting cells which can activate T cells to induce the primary immune response. For clinical studies, DCs are often differentiated in vitro from peripheral blood mononuclear cells (PBMCs) through treatment with granulocyte macrophage colony-stimulating factor (GM-CSF) and IL-4. However, IL-13, a cytokine closely related to IL-4, has also been reported to induce differentiation equally or more efficiently when used with GM-CSF. For the present study, we compared the DC characteristics exhibited by iDCs and LPS-matured DCs differentiated from PBMCs using GM-CSF and IL-4 or IL-13. Physical characteristics examined include cellular morphology and surface phenotype. Functional traits investigated include FITC-dextran uptake, IL-10 and IL-12 production, allostimulation and cytokine production by stimulated T cells and antigen-specific T cell stimulation. Compared with IL-13-derived DCs, IL-4 treatment yielded more differentiated DCs, with extensive dendrites and higher expression of DC-SIGN, DEC-205, CD86 and HLA-DR. In addition, IL-4 DCs were more efficient at inducing allogeneic T cell proliferation and immature IL-4 DCs had higher endocytic activity at low FITC-dextran concentrations (1 microg ml(-1)). Although IL-13 was capable of generating DCs from PBMCs, it was not as effective as IL-4 in generating DC phenotype and functionality. Thus, the use of GM-CSF and IL-4 is the more efficient treatment for inducing DC differentiation from PBMCs.     

Cytokine mRNA levels in antigen-stimulated peripheral blood mononuclear cells

Levels of cytokine mRNA coding for granulocyte-macrophage colony-stimulating factor (GM-CSF), interferon-gamma (IFN-gamma), interleukin (IL) 2, IL 1 beta, IL 4 or IL 6 have been measured by Northern blot analysis after antigen stimulation. As source for RNA we used peripheral blood mononuclear cells (PBMC) from donors which showed a proliferative response after tetanus toxoid or Candida albicans stimulation. For comparison PBMC were also stimulated with lectins and anti-CD3 antibody. With some variations among donors, antigens clearly induced measurable levels of IFN-gamma, GM-CSF and IL 2 mRNA. Increased levels for IL 6 were also detected after antigen stimulation. In contrast to polyclonal T cell stimuli, antigens showed delayed kinetics of mRNA steady-state levels and resembled in this respect more closely the stimulation with pokeweed mitogen. Thus, cytokine mRNA levels may be assessed in unfractionated PBMC after antigen stimulation. The two tested antigens also clearly show a cytokine pattern distinct from that induced in polyclonal stimulations such as anti-CD3.