雷公藤内酯醇对系统性红斑狼疮患者DC细胞功能及成熟的影响

目的 通过体外实验研究雷公藤内酯醇(triptolide)对系统性红斑狼疮(systemic lupus erythematosus,SLE)患者树突状细胞(dendritic cell,DC)功能及成熟的影响,为进一步阐明雷公藤内酯醇的免疫学活性提供依据.方法 从SLE患者外周血分离单个核细胞,流式细胞仪分选DC,加入0、5、10、30μg/L的雷公藤内酯醇共孵育,24h后收集上清液,ELISA检测IFN-α、IL-6、TNF-α量,5d后收集细胞,流式细胞仪检测DC表型CD11c、CD80、CD86阳性率,光镜观察DC的形态,扫描电镜观察DC的超微结构.结果 雷公藤内酯醇显著减低活动期与非活动期SLE患者IFN-α、IL-6、TNF-α量,并呈雷公藤内酯醇浓度依赖性(P＜0.05);雷公藤内酯醇可抑制SLE患者DC的分化和成熟,并呈雷公藤内酯醇浓度依赖性(P＜0.05).结论 雷公藤内酯醇能够减弱SLE患者DC的功能,并抑制其分化和成熟.     

IL-24基因修饰的树突状细胞促进CIK细胞对肺癌细胞的杀伤作用

Objective To study the antitumor effect and mechanism of co-cultured cytokine-induced killer(CIK) cells and autologous DC modified with IL-24 gene on A549 cells in vitro. Methods DC and CIK cells were prepared routinely from human peripheral blood mononuclear cells(PBMC). Recombinant adenovirus vector pAdEasy-1-pTrack-CMV-IL-24 was extracted from DH5α, it was lineared with Pac I and transfected into A293 cells, and then the IL-24 recombined adenovirus(Ad-IL-24) was obtained. Ad-IL-24 was used to infect DC. The cells obtained were named DC-IL-24. RT-PCR and ELISA were used to evaluate the expression of IL-24 gene in transfected DC. The phenotypes change of DC were identified by flow cytometry analysis, the concen-tration of IL-12 and TNF-α in supernatant of DC were determined by EIJSA. The ability of CIK producing per-forin was measured by homolysis method. FCM was used to determine the cytotoxicity of cocultured CIK cells and autologous DC modified with IL-24 gene to A549 cells. Results We obtained the high titre of Ad-IL-24.IL-24 gene was transfered into DC successfully via Ad-IL-24. The green fluorescence was observed on DC by fluorescence microscope. The expression rate of CD80, CD83, HI.A-DR, CD40, CXCR4 on DC-IL-24 was sig-nificantly increased compared with that of the control group. DC-IL-24 produced markedly higher levels of IL-12 and TNF-α as compared with DC. DC-IL-24 can enhance the ability of CIK cells producing perforin. On com-parison with non-transfected DC co-cultured with CIK cells, transfected DC co-cultured with CIK cells had a sig-nificantly higher lytic activity against A549 cells. Conclusion IL-24 gene modification can enhance the anti-tu-moral immunity of DC. The mechanism of which might be related to the increased secretion of IL-12 and TNF-α, up-regulation expression of co-stimulatory molecules and MHC Ⅱ class molecules on DC, promoting the acti-vation and maturation of DC, and then enhancing CIK cells to generate specific anti-tumoral immunity.     

Interferon γ Stimulates Cellular Maturation of Dendritic Cell Line DC2.4 Leading to Induction of Efficient Cytotoxic T Cell Responses and Antitumor Immunity

Dendritic cells （DCs） are the most potent antigen-presenting cells （APCs） for the initiation of antigen （Ag）-specific immune responses. In most studies, mature DCs are generated from bone marrow cells or peripheral monocytes; in either case, the harvested cells are then cultured in medium containing recombinant GM-CSF, IL-4 and TNF-α for 7-10 days and stimulated with lipopolysaccharide （LPS）. However, this approach is time-consuming and expensive. There is another less cost approach of using immobilized DC cell lines, which can easily grow in the medium. A disadvantage with the immobilized DC cell lines, however, is that they are immature DCs and lack expression of MHC class Ⅱ and costimulatory CD40 and CD80 molecules. This, therefore, limits their capacity for inducing efficient antitumor immunity. In the current study, we investigated the possible efficacy of various stimuli （IL-1β, IFN-γ, TNF-α CpG and LPS） in converting the immature dendritic cell line DC2.4 to mature DCs. Our findings were quite interesting since we demonstrated for the first time that IFN-γ was able to stimulate the maturation of DC2.4 cells. The IFN-γ-activated ovalbumin （OVA）-pulsed DC2.4 cells have capacity to upregulate MHC class Ⅱ, CD40, CD80 and CCR7, and to more efficiently stimulate in vitro and in vivo OVA-specific CD8^＋ T cell responses and antitumor immunity. Therefore, IFN-γ-activated immortal DC2.4 ceils may prove to be useful in the study of DC biology and antitumor immunity.     

Plasmacytoid dendritic cells act as the most competent cell type in linking antiviral innate and adaptive immune responses

Appropriate in vivo control of plasmacytoid dendritic cell （pDC） recruitment and activation is a fundamental requirement for defense against viral infection. During this process, a pivotal event that influences the outcome of viral infection is the production of high levels of type I interferon by pDCs. In particular, recent research findings showed that pDCs not only shape the nature of innate resistance, but are also responsible for the successful transition from innate to adaptive immunity for viral resistance. In addition, pDCs can differentiate into antigen presenting cells that may regulate tolerance to a given pathogen. Importantly, in a series of recent clinical studies, pDCs appeared to be defective in number and function in conditions of chronic viral diseases such as infected with HIV-1, HBV or HCV. pDC-associated clinical antiviral therapy is also emerging. This review describes research findings exatnining the functional and antiviral properties of in vivo pDC plasticity. Cellular ＆ Molecular Immunology. 2005;2（6）：411- 417.     

黄芪多糖对浆细胞样树突状细胞功能及成熟的影响

目的:通过体外实验研究黄芪多糖(Astragalus polysaccharide,APS)对浆细胞样树突状细胞(Plasmacytoid dendritic cell,pDC)功能及成熟的影响,为进一步阐明黄芪多糖的免疫学活性提供依据。方法:从健康志愿者外周血分离单个核细胞,流式细胞仪分选pDC,加入0、50、100、200mg/L的黄芪多糖共孵育,24小时后收集上清液,应用酶联免疫吸附试验检测pDC分泌的IFN-α、TNF-α、IL-6量,5天后收集细胞,应用流式细胞仪检测树突状细胞(Dendritic cell,DC)表型CD11c、CD80、CD86阳性率、光镜观察DC的形态、扫描电镜观察DC的超微结构。结果:黄芪多糖显著提高pDC分泌的IFN-α、TNF-α、IL-6量,并且呈黄芪多糖浓度依赖性(P0.05);黄芪多糖可促进pDC向DC的分化和成熟,并呈黄芪多糖浓度依赖性(P0.05)。结论:黄芪多糖能够增强pDC的功能,并促进其向DC的分化和成熟。     

The current immune function of hepatic dendritic cells

While only a small percentage of the liver as dendritic cells, they play a major role in the regulation of liver immunity. Four major types of dendritic cell subsets include myeloid CD8α^-B220^-, lymphoid CD8α^＋B220^-, plasmacytoid CD8α^-B220^＋, and natural killer dendritic cell with CD8α^-B220^-NK1.1^＋ phenotype. Although these subsets have slightly different characteristics, they are all poor naive T cell stimulators. In exchange for their reduced capacity for allostimulation, hepatic DCs are equipped with an enhanced ability to secrete cytokines in response to TLR stimulation. In addition, they have increased level of phagocytosis. Both of these traits suggest hepatic DC as part of the innate immune system. With such a high rate of exposure to the dietary and commensal antigens, it is important for the hepatic DCs to have an enhanced innate response while maintaining a tolerogenic state to avoid chronic inflammation. Only upon secondary infectivity does the hepatic DC activate memory T cells for rapid eradication of recurring pathogen. On the other hand, overly tolerogenic characteristics of hepatic DC may be responsible for the increase prevalence of autoimmunity or liver malignancies.     

Serum IL-10 from systemic lupus erythematosus patients suppresses the differentiation and function of monocyte-derived dendritic cells

The role played by cytokines,other than interferon(IFN)-α,in the differentiation and function of dendritic cells(DCs) in systemic lupus erythematosus(SLE),remains unclear.Serum interleukin-10(IL-10) levels are generally elevated in SLE patients,which might modulate the differentiation of DCs.In this study,DCs were induced from monocytes either by transendothelial trafficking or by culture with granulocyte-macrophage colony-stimulating factor(GM-CSF) + IL-4 + tumor necrosis factor(TNF)-α.Both systems were used to investigate the effects of elevated serum IL-10 level on DC differentiation in SLE patients.The results showed that monocyte-derived DCs induced by either SLE serum or exogenous IL-10 reduced the expression of human leukocyte antigen(HLA)-DR and CD80,decreased IL-12p40 level,and increased IL-10 level,and exhibited an impaired capacity to stimulate allogenic T-cell proliferation.These results indicate that serum IL-10 may be involved in the pathogenesis of SLE by modulating the differentiation and function of DCs.     

Antitumor activity and immune enhancement of murine interleukin-23 expressed in murine colon carcinoma cells

Interleukin （IL）-23, a cytokine composed of p19 and the p40 subunit of IL-12, can enhance the proliferation of memory T cells and production of IFN-γ from activated T cells. It can also induce antitumor effects in murine model. To further evaluate the antitumor activity and immune enhancement of IL-23 in vivo, murine colon carcinoma cells retrovirally transduced with mIL-23 gene were injected subcutaneously （s.c.） into BALB/c mice. Survival time and tumor volume were observed. LDH release assay, [^3H]-TdR incorporation assay and ELISA were used to determine CTL activity, proliferation of splenocytes and level of cytokines, respectively. Number of dendritic cells （DCs） was analyzed by flow cytometry （FCM）. IL-23 secreted by Colon26/IL-23 cells suppressed the growth of tumor and prolonged the survival time of mice, enhanced proliferation of splenocytes, CTL activity, and number of DCs. IL-23 also promoted the production of Thl cytokines such as IFN-γ, IL-12 and TNF-α. However, the level of IL-4 was not enhanced significantly. These data suggested that IL-23 secreted by tumor cells can induce antitumor activitv bv enhancing immune resnonse.     

MBL抑制白假丝酵母菌刺激THP1/CD14细胞产生TNF-α和IL-8

目的 探讨甘露聚糖结合凝集素(mannan-binding lectin,MBL)对白假丝酵母菌(Candida albicans)刺激的THP1/CD14细胞产生TNF-α和IL-8的影响.方法 以不同浓度人MBL预处理THP1/CD14细胞2 h后,再用热灭活的酵母相C.albicans和/或菌丝相C. albicans刺激细胞24 h,收集培养上清,以ELISA从蛋白水平分析其TNF-α和IL-8的产生.收集细胞提取总RNA,以RT-PCR从转录水平评估TNF-α和IL-8的表达,Western blot分析NF-KB的细胞核移位.结果 ELISA检测发现,两种相态的C. albicans均可刺激各组细胞分泌TNF-α和IL-8,酵母相C.albicans刺激细胞产生细胞因子水平稍高;高浓度MBL(10～20 mg/L)均可抑制两种相态的C. albicans诱导细胞分泌TNF-α和IL-8,低浓度MBL(1 mg/L)则几乎无影响;RT-PCR分析亦显示,与相应只用C. albicans刺激的实验组相比,高浓度MBL(20 mg/L)对两种相态的C. albicans诱导的TNF-α、IL-B的mRNA表达均有不同程度的抑制作用;Western blot分析显示,高浓度MBL(20 mg/L)对两种相态的C. albicans诱导的NF-KB细胞核移位有显著的抑制作用.结论 MBL可抑制C.albicans诱导的THP1/CD14细胞产生TNF-α和IL-8,提示MBL能够在抗C.albicans 免疫中起调控作用.

Abstract：

Objective To investigate the effects of mannan-binding lectin (MBL) on IL-8 and TNF-α production induced by Candida albicans ( C. albicans) in human THP1/CD14 monocytes. Methods The THP1/CD14 cells were stimulated for 24 h with heat-inactivated yeast form or hyphal form cells of C. albicans strain at the indicated ratios after pretreated with human natural MBL at concentrations ranging from 1 to 20 mg/L for 2 h. The content of IL-8 and TNF-α in culture supernatants were detected by ELISA,and the levels of IL-8 and TNF-α mRNA expressions in these cells were determined by RT-PCR. Western blot was used to detect C. albicans-induced NF-κB translocation in THP1/CDI4 cells. Results ELISA showed that secretion of IL-8 and TNF-α from THP1/CD14 cells could be induced by both yeast cells and hyphal cells. Hyphal cells proved to be much less efficient than yeast cells in stimulating production of IL-8and TNF-α by THP1/CD14 cells. The productions of IL-8 and TNF-α by THP1/CD14 cells induced with C.albicans were profoundly inhibited by MBL at higher concentrations ( 10-20 mg/L) but not MBL at lower concentrations ( 1 mg/L). RT-PCR analysis also indicated that the mRNA expressions of IL-8 and TNF-αt in THP1/CD14 cells were decreased to various extents by MBL at higher concentration, compared to the corresponding THP1/CD14 cells stimulated with C. albicans only. Similarly, MBL at higher concentration ( 20mg/L) decreased the NF-κB translocation in THP1/CD14 cells. Conclusion MBL may inhibit IL-8 and TNF-α production induced by dimorphism C. albicans in THP1/CD14 cells, suggesting that MBL can play some roles on the regulation of C. albicans immune response.     

慢性HCV感染者外周血中髓样和浆样树突状细胞频数和表型研究

目的 探讨慢性HCV感染者外周血中髓样树突状细胞(mDC)和浆样树突状细胞(pDC)频数和表型的变化,并分析其与丙型肝炎临床指标间的相关性.方法 采用流式细胞术检测HCV感染者及健康对照外周血中mDC和pDC的频数及细胞表面共刺激分子HLA-DR、CD83、CD86、CD40和共抑制分子PD-L1的表达水平,并分析DC频数与HCV感染者血浆病毒载量、谷丙转氨酶(ALT)的相关性.结果 与健康对照组相比,HCV感染者外周血中mDC和pDC的频数明显降低(患者组分别为0.37±0.19和0.19±0.12,对照组为0.51±0.18和0.29±0.13,P＜0.05),且mDC频数与血浆HCV载量和血清ALT水平呈负相关(r=-0.5878,P＜0.0001;r=-0.4628,P=0.003).患者mDC和pDC表面共刺激分子HLA-DR、CD83、CD86、CD40以及共抑制分子PD-L1的表达均有不同程度升高,差别有统计学意义(共刺激分子P＜0.01,共抑制分子P＜0.05或0.01).结论 慢性HCV感染者外周血mDC和pDC频数下降,但DC表面共刺激分子和共抑制分子的表达均明显升高.该结果提示mDC数量的减少可能与HCV的慢性持续性感染有关.

Abstract：

Objective To explore the frequencies and phenotype of myeloid and plasmacytoid dendritic cells (mDC and pDC) in chronic HCV infection and to investigate the relationships between DC frequencies and HCV viral load and serum ALT level. Methods PBMC were isolated from chronic HCV infected patients and healthy control. Multi-color flow cytometry was used to analyze the frequencies and surface marker expression on mDC and pDC. The relationship between DC frequencies and viral load and ALT level was also calculated. Results In comparison with healthy control, frequencies of mDC and pDC in chronic HCV infection were significantly decreased (0. 37 ± 0. 19 and 0. 19 ± 0. 12 vs 0. 51 ± 0. 18 and 0. 29 ± 0.13, P＜0.05). The frequency of mDC was negatively correlated with HCV viral load (r= -0.5878, P ＜ 0. 0001 ) and serum ALT level ( r = - 0. 4628 , P = 0. 003 ). Both costimulatory markers ( HLA-DR, CD83, CD86, and CD40) and coinhibitory marker (PD-L1) expression on mDC and pDC in HCV infection were increased (P＜0.01 for costimulatory marker, P＜0.05 or F＜0.01 for coinhibitory marker). Conclusion The frequencies of mDC and pDC in chronic HCV infection were decreased, while the expression of costimulatory markers and coinhibitory marker were increased or not decreased in HCV infection. The decreased frequency of mDC was probably related to persistance of HCV infection.     

登革病毒促进人树突状细胞分泌TNF-α、IL-6、IFN-γ的动态观察

目的：研究登革病毒（DV）对人树突状细胞（DC）产生细胞因子的影响。 方法： 人外周新鲜血常规分离单核细胞，经细胞因子GM-CSF、IL-4诱导培养DC，形态学特征、细胞表型和淋巴细胞刺激能力鉴定。用登革病毒2型感染DC，于作用后6、12、24、48、72 h分别收集上清液和细胞，间接免疫荧光法检测细胞上病毒抗原表达，ELISA法检测登革病毒感染后细胞因子TNF-α、IL-6、IFN-γ水平的动态变化。 结果： 人外周血经GM-CSF、IL-4诱导培养1周即可得到典型树突状细胞。间接免疫荧光法证明感染的DC胞浆和胞膜上携带登革病毒抗原，DV感染使DC分泌TNF-α、IL-6能力显著大于对照组（P<0.01），但其分泌IFN-γ的能力无明显改变。 结论： 树突状细胞是登革病毒的靶细胞，登革病毒感染可促进树突状细胞分泌TNF-α、IL-6。树突状细胞可能参与机体抗登革病毒感染的免疫防御机制。     

IRF1对M1巨噬细胞极化及其抗肿瘤效应的影响

目的研究IRF1对M1巨噬细胞极化及M1介导的抗肝癌细胞增殖和凋亡的影响。方法构建单核细胞U937来源M1巨噬细胞模型(U937-M1),将细胞分为4组:用PMA诱导的未活化巨噬细胞组(M0),用PMA,IFN-γ和LPS处理的M1型巨噬细胞组(M1),用siRNA干扰IRF1的M1型巨噬细胞组(si IRF1)以及阴性干扰的M1型巨噬细胞组(si C)。用流式细胞术检测M1/M2特异表面标志物CD86/CD206的表达;q PCR检测M1/M2相关基因(IL-12p35,IL-12p40,IL-23p19,IL-6,TNF-α/IL-10)及IFNB1的表达;ELISA检测IL-12p70,IL-10及IFN-β的表达;Western blot检测IRF1及IRF5的表达;CCK8和流式细胞术分别检测Hep G2及SMMC-7721增殖和凋亡。结果与U937-M1组相比,干扰IRF的M1组CD86表达降低,但CD206升高(P0.05);mRNA水平上,IL-12p35,IL-12p40,IL-23p19,IL-6,TNF-α以及IFNB1表达降低,但IL-10表达增高(P0.01);蛋白水平上,IL-12p70,IFN-β及IRF5表达降低,但IL-10表达增高(P0.05)。IRF1干扰后,M1巨噬细胞促进肝癌细胞增殖、抑制其凋亡(P0.05)。结论干扰IRF1后,M1巨噬细胞极化状态受损,甚至部分向M2型转变;其抗肿瘤效应转变为促肿瘤效应;且IRF1可能参与调节IFN-β与IRF5的表达。     

干扰素-β转染对胶质瘤的治疗和细胞因子的调节作用

目的 探讨干扰素-β（IFN-β）基因转染对胶质瘤的生长抑制和诱导凋亡的作用,明确IFN—B在SK—MG-1细胞系中对其他细胞因子的调节作用。方法 用IFN—β基因转染和蛋白刺激胶质瘤细胞系SKMG-1,通过MTT方法检测细胞增殖情况,并运用流式细胞技术检测其对凋亡的影响,同时用RT—PCR的方法检测细胞因子的表达变化。结果 IFN—β基因转染可以明显抑制细胞增殖,转染后48h和72h对肿瘤细胞的生长抑制率达到37．3％和46．0％。IFN—β基因转染还可以诱发细胞凋亡,转染后48h和72h肿瘤凋亡率达到31．7％和48．2％。RT—PCR结果显示在胶质瘤细胞系中IFN—β上调白细胞介素-1β（IL-1β）和肿瘤坏死因子-α（TNF—α）的mRNA表达,同时一过性下调白细胞介素-6（IL-6）的mRNA表达,而后在24h后上调IL-6的表达。结论 IFN—β基因转染可以抑制胶质瘤细胞系SK-MG-1的增殖,诱发细胞的凋亡,IFN—β对胶质瘤的生长抑制作用可能与其对其它细胞因子的调节作用有关。     

活动性结核病患者外周血单个核细胞中结核分枝杆菌抗原特异性多能CD4+和CD8+T淋巴细胞的特征研究

目的 研究活动性结核病患者外周血单个核细胞中结核分枝杆菌抗原特异性多能T淋巴细胞细胞因子的分泌特征.方法 利用γ干扰素释放试验和多色流式细胞术分析了13例活动性结核病患者、11例肺部感染性/肿瘤疾病患者以及14例健康对照者外周血中结核分枝杆菌抗原特异性(ESAT-6和CFP-10)CD4+Th1和CD8+Tc淋巴细胞表达细胞因子IFN-γ、TNF-α和IL-2的情况.结果 与肺部感染性/肿瘤疾病组和健康对照组相比:(1)活动性结核病组具有较低比例的分泌TNF-α+的CD4+Th1细胞、较高比例的分泌IFN-γ+和IFN-γ+TNF-α+IL-2+的CD4+Th1细胞;(2)活动性结核病组具有较高比例的分泌IFN-γ+TNF-α+IL-2+的CD8+Tc细胞.结论 实验结果提示活动性结核病患者中表达IFN-γ+TNF-α+IL-2+的多能CD4+Th1及CD8+Tc细胞,可能在区别活动性结核病与肺部感染性/肿瘤疾病方面具有一定的临床参考价值.     

Activation of plasmacytoid dendritic cells and B cells with two structurally different Toll-like receptor 7 agonists

Synthetic Toll-like receptor (TLR) 7 agonists have been suggested as immune modulators in a range of conditions. In contrast, self-derived TLR7 activators, such as RNA-containing immune complexes (RNA-IC), can contribute to autoimmune diseases due to endogenous immune activation. The exact difference in immune cell response between synthetic and endogenous TLR7 triggers is only partly known. An understanding of these differences could aid in the development of new therapeutic agents and provide insights into autoimmune disease mechanisms. We therefore compared the stimulatory capacity of two TLR7 agonists, RNA-IC and a synthetic small molecule DSR-6434, on blood leucocytes, plasmacytoid dendritic cells (pDCs) and B cells from healthy individuals. IFN-α, IL-6, IL-8 and TNF levels were measured by immunoassays, and gene expression in pDCs was analysed by an expression array. DSR-6434 triggered 20-fold lower levels of IFN-α by pDCs, but higher production of IL-6, IL-8 and TNF, compared to RNA-IC. Furthermore, IFN-α and TNF production were increased with exogenous IFN-α2b priming, whereas IL-8 synthesis by B cells was reduced for both stimuli. Cocultivation of pDCs and B cells increased the RNA-IC-stimulated IFN-α and TNF levels, while only IL-6 production was enhanced in the DSR-6434-stimulated cocultures. When comparing pDCs stimulated with RNA-IC and DSR-6434, twelve genes were differentially expressed (log₂ fold change >2, adjusted P-value <.05). In conclusion, RNA-IC, which mimics an endogenous TLR7 stimulator, and the synthetic TLR7 agonist DSR-6434 trigger distinct inflammatory profiles in immune cells. This demonstrates the importance of using relevant stimuli when targeting the TLR7 pathway for therapeutic purposes.     

CHD患者治疗前后血清IL-6、TNF-α、IFN-γ检测的临床意义

目的:探讨冠心病(CHD)患者治疗前后血清IL-6、TNF-α、IFN-γ水平的变化及临床意义.方法:应用放射免疫分析对66例CHD患者进行了血清IL-6、TNF-α、IFN-γ水平检测[其中稳定型心绞痛(SAP)31例,不稳定型心绞痛(UAP)22例,急性心肌梗死(AMI)13例],并与35名正常健康人作比较.结果:...     

Cyclosporin A and tacrolimus reduce T-cell polyfunctionality but not interferon-γ responses directed at cytomegalovirus

Cytomegalovirus (CMV) -specific immunity is often estimated by the number of in vitro CMV antigen-inducible interferon-γ-positive (IFN-γ(+) ) T cells. However, recent work indicates that simultaneous production of IFN-γ, tumour necrosis factor-α (TNF-α) and interleukin-2 (IL-2) (referred to as 'polyfunctionality') is more relevant for anti-viral protection. Here, we compared polyfunctionality of CMV-specific T cells (pp65 and IE-1 proteins) in 23 solid-organ transplant patients and seven healthy controls by flow cytometry. The proportions of TNF-α(+) /IFN-γ(+) /IL-2 cells among the activated cells were significantly reduced in transplant patients but not the frequencies of IFN-γ(+) CD8(+) T cells. Immunosuppression reduces polyfunctionality, which reflects the increased infection risk in this patient group.     

急性骨髓炎患者血清IFN-γ、IL-6及TNF-α动态变化及其临床意义

目的探讨急性骨髓炎(AOL)患者血清干扰素-γ(IFN-γ)、白细胞介素-6(IL-6)及肿瘤坏死因子-α(TNF-α)动态变化及其临床意义。方法病例源于2018年1月至2018年6月本院骨科收治的48例AOL患者和同期健康的42例骨折患者,分别记为疾病组、对照组,对比两组血清IFN-γ、IL-6及TNF-α水平,观察不同临床特征AOL患者血清IFN-γ、IL-6及TNF-α水平变化,并分析不同预后患者血清IFN-γ、IL-6及TNF-α动态变化及其临床意义。结果与对照组比较,疾病组血清IFN-γ明显降低、IL-6及TNF-α水平明显升高,差异有统计学意义(P<0.05),AOL患者血清IFN-γ、IL-6及TNF-α水平在性别、年龄、BMI分布上差异无统计学意义(P>0.05);但在感染部位分布上差异有统计学意义(P<0.05);AOL患者第1、3、5d IFN-γ水平依次明显升高、IL-6及TNF-α水平则依次明显降低(P<0.05),且入院后第1、3、5d与预后不良组比较,预后良好组血清IFN-γ水平明显升高、IL-6、TNF-α水平明显降低(P<0.05);AOL患者血清IFN-γ水平与预后呈明显正相关(r=0.421,P<0.01),而IL-6及TNF-α水平与预后呈明显的负相关(r=-0.368、-0.407,P<0.01)。结论AOL患者血清IFN-γ水平呈下降趋势、IL-6、TNF-α水平呈上调趋势,三者动态监测利于AOL患者预后评估及早期治疗方案的制定。     

白细胞介素-18干预诱导的树突状细胞表型和活性研究

目的：研究白细胞介素-18（IL-18）干预诱导的树突状细胞（DC）的表型和活性。方法:自人外周血单核细胞诱导DC，第5 d起分为IL-18组、TNF-α组和IL-18+TNF-α组，分别加IL-18、TNF-α及IL-18+TNF-α促成熟，用ELISA法测定上清中IL-12含量；用流式细胞仪测定培养8 d DC的CD1a、HLA-DR、CD83及CD86的表达；用MTT法检测3组DC诱导T细胞增殖的作用。用ELISA法测定3组DC刺激T细胞分泌干扰素γ(IFN-γ)的量。结果:IL-18组与TNF-α组CD1a、HLA-DR、CD83及CD86表达无差异，IL-18+TNF-α组CD1a、CD83及HLA-DR阳性率高于IL-18组。IL-18+TNF-α组IL-12量高于IL-18组和TNF-α组(P＜0.05)。IL-18组与TNF-α组DC刺激T细胞增殖作用无差异，IL-18+TNF-α组DC的作用强于IL-18组和TNF-α组。IL-18组和TNF-α组IFN-γ量无显著差异，IL-18+TNF-α组IFN-γ的量高于IL-18组和TNF-α组(P＜0.05)。结论:IL-18干预诱导的DC高表达表面分子，具有明显的免疫刺激活性，IL-18与 TNF-α合用作用更强。