粉尘螨滴剂脱敏治疗对呼吸道变应性疾病Th1/Th2平衡的调控

目的探讨粉尘螨滴剂舌下脱敏治疗对呼吸道变态反应性疾病的疗效和意义。方法将60例呼吸道变应性疾病患者按病因的不同分为哮喘组和过敏性鼻炎组,每组30例。2组均给予粉尘螨滴剂舌下脱敏治疗,1年为1个疗程。另选择30例无鼻炎、哮喘及其他过敏性疾病的正常人为对照组。治疗1年后采用酶联免疫吸附法检测各组静脉血中IL-2、IL-6水平,对各组血中IL-2及IL-6水平的变化进行比较。结果经过1个疗程治疗后哮喘组、过敏性鼻炎组血清IL-2水平较治疗前显著增高、血清IL-6的水平较治疗前显著降低(均P<0.05)。但哮喘组、过敏性鼻炎组治疗后血清IL-2均低于对照组、血清IL-6均高于对照组(均P<0.05)。结论粉尘螨滴剂舌下脱敏治疗可以有效地调整失衡的Th1/Th2免疫应答,使机体Th1/Th2细胞免疫趋于平衡。     

Th1/Th2 imbalance in HCV-related liver cirrhosis

The mechanism by which Hepatitis C virus(HCV) infection promotes the development of hepatocellular carcinoma(HCC) is not known exactly. HCV related HCC occurs frequency in the patients with cirrhosis. There have been reports indicating that Th2-type cytokines down-regulated antitumor immunity, and the activation of type 1 T cell responses produced antitumor immunity. We thought Th1/Th2 imbalance in HCV-related liver cirrhosis might be closely related to the development of HCC. In this study, therefore, we investigated the Th1/Th2 balance at the single lymphocyte level of the patients with HCV-related liver cirrhosis and compared with normal controls by using flow cytometry. Th1-type cytokines(IFN-gamma, IL-2) production was significantly decreased in patients with cirrhosis, whereas Th2-type cytokine production(IL-10) was increased. These suggest Th1/Th2 imbalance in HCV-related cirrhosis would decrease the antitumor immunity and its improvement might present the protective effect from HCC.     

Two types of mouse T helper cell. IV. Th2 clones secrete a factor that inhibits cytokine production by Th1 clones

A cytokine synthesis inhibitory factor (CSIF) is secreted by Th2 clones in response to Con A or antigen stimulation, but is absent in supernatants from Con A-induced Th1 clones. CSIF can inhibit the production of IL-2, IL-3, lymphotoxin (LT)/TNF, IFN-gamma, and granulocyte-macrophage CSF (GM-CSF) by Th1 cells responding to antigen and APC, but Th2 cytokine synthesis is not significantly affected. Transforming growth factor beta (TGF-beta) also inhibits IFN-gamma production, although less effectively than CSIF, whereas IL-2 and IL-4 partially antagonize the activity of CSIF. CSIF inhibition of cytokine synthesis is not complete, since early cytokine synthesis (before 8 h) is not significantly affected, whereas later synthesis is strongly inhibited. In the presence of CSIF, IFN-gamma mRNA levels are reduced slightly at 8, and strongly at 12 h after stimulation. Inhibition of cytokine expression by CSIF is not due to a general reduction in Th1 cell viability, since actin mRNA levels were not reduced, and proliferation of antigen-stimulated cells in response to IL-2, was unaffected. Biochemical characterization, mAbs, and recombinant or purified cytokines showed that CSIF is distinct from IL-1, IL-2, IL-3, IL-4, IL-5, IL-6, IL-7, IFN-gamma, GM-CSF, TGF-beta, TNF, LT, and P40. The potential role of CSIF in crossregulation of Th1 and Th2 responses is discussed.     

循环毒毒蛇咬伤患者外周血Th1/Th2细胞因子的表达及意义

目的分析外周血Th1/Th2细胞因子在循环毒毒蛇咬患者中的表达,探讨其在病情评估中的意义。方法收集2016年3月至2017年10月循环毒毒蛇咬伤患者108例,根据国际蛇伤诊断标准分为轻度蛇咬伤组82例与重度蛇咬伤组26例,另外选择同期体检健康者30例为对照组。通过流式细胞术检测并比较分析各组患者T淋巴细胞亚群的分布情况及外周血Th1/Th2细胞因子的表达。结果与对照组比较,重度蛇咬伤组CD3^+、CD4^+T淋巴细胞水平偏低(P<0.01);细胞因子IL-4、IL-6、IL-10、TNF-α表达水平升高(P<0.05)。蛇咬伤组两两比较,重度蛇咬伤组CD3^+、CD4^+T淋巴细胞水平低于轻度蛇咬伤组(P<0.05),IL-4、IL-6、TNF-α表达水平均高于轻度蛇咬伤组(P<0.05)。结论循环毒毒蛇咬伤患者中存在有明显的T淋巴细胞数量的改变和Th1/Th2细胞因子表达紊乱,且与病情严重程度相关。     

Downregulation of Th1 cytokine production accompanies induction of Th2 responses by a parasitic helminth, Schistosoma mansoni

In the mouse, infection with Schistosoma mansoni results in an egg-producing infection and associated disease, whereas vaccination with attenuated larval stages produces a substantial and specific immunity in the absence of egg-induced pathology. Preliminary data showing enhanced interleukin-5 (IL-5) production by T cells from infected mice and interferon gamma (IFN-gamma) synthesis by cells from vaccinated animals (7), suggested differential CD4+ subset stimulation by the different parasite stimuli. To confirm this hypothesis, lymphocytes from vaccinated or infected animals were compared for their ability to produce IFN-gamma and IL-2 (secreted by Th1 cells) as compared with IL-4 and IL-5 (characteristic Th2 cytokines). After stimulation with specific antigen or mitogen, T cells from vaccinated mice or prepatently infected animals responded primarily with Th1 lymphokines, whereas lymphocytes from patently infected mice instead produced Th2 cytokines. The Th2 response in infected animals was shown to be induced by schistosome eggs and directed largely against egg antigens, whereas the Th1 reactivity in vaccinated mice was triggered primarily by larval antigens. Interestingly, Th1 responses in mice carrying egg-producing infections were found to be profoundly downregulated. Moreover, the injection of eggs into vaccinated mice resulted in a reduction of antigen and mitogen-stimulated Th1 function accompanied by a coincident expression of Th2 responses. Together, the data suggest that coincident with the induction of Th2 responses, murine schistosome infection results in an inhibition of potentially protective Th1 function. This previously unrecognized downregulation of Th1 cytokine production may be an important immunological consequence of helminth infection related to host adaptation.     

阻塞性睡眠呼吸暂停低通气综合症患者外周血Th1/Th2细胞因子表达水平的研究

目的:检测阻塞性睡眠呼吸暂停低通气综合症(OSAHS)患者外周血CD4+T淋巴细胞分泌的细胞因子水平,探讨患者Th1/Th2相关细胞因子的平衡及其临床意义.方法:47例OSAHS患者按照呼吸暂停低通气指数(AHI)水平分为轻度组(n＝16),中度组(n＝17),重度组(n＝14),18例健康人作为对照组,分别测定各组外周血中Thl细胞因子:干扰素γ (IFN-γ)、白细胞介素2 (IL-2)和肿瘤坏死因子β (TNF-β);Th2的细胞因子:IL-4、IL-10和IL-12的含量.结果:OSAHS各组Thl型细胞因子中IFN-γ高于对照组,随着病情的进展有逐渐升高趋势,但仅在重度组与中度组、轻度组、健康组比较时P均＜0.05,其余Th1/Th2细胞因子在进行两两比较时各组间均无明显差异.OSAHS患者IFN-γ与AHI呈正相关,而Th2细胞因子与AHI无相关关系.结论:OSAHS患者Thl/Th2平衡失调,向Thl方向漂移,Th1细胞表型处于优势状态,且与OSAHS的严重程度相关.     

Interleukin 12 inhibits antigen-induced airway hyperresponsiveness, inflammation, and Th2 cytokine expression in mice

Allergic asthma is characterized by airway hyperresponsiveness and pulmonary eosinophilia, and may be mediated by T helper (Th) lymphocytes expressing a Th2 cytokine pattern. Interleukin (IL) 12 suppresses the expression of Th2 cytokines and their associated responses, including eosinophilia, serum immunoglobulin E, and mucosal mastocytosis. We have previously shown in a murine model that antigen- induced increases in airway hyperresponsiveness and pulmonary eosinophilia are CD4+ T cell dependent. We used this model to determine the ability of IL-12 to prevent antigen-induced increases in airway hyperresponsiveness, bronchoalveolar lavage (BAL) eosinophils, and lung Th2 cytokine expression. Sensitized A/J mice developed airway hyperresponsiveness and increased numbers of BAL eosinophils and other inflammatory cells after single or repeated intratracheal challenges with sheep red blood cell antigen. Pulmonary mRNA and protein levels of the Th2 cytokines IL-4 and IL-5 were increased after antigen challenge. Administration of IL-12 (1 microgram/d x 5 d) at the time of a single antigen challenge abolished the airway hyperresponsiveness and pulmonary eosinophilia and promoted an increase in interferon (IFN) gamma and decreases in IL-4 and IL-5 expression. The effects of IL-12 were partially dependent on IFN-gamma, because concurrent treatment with IL-12 and anti-IFN-gamma monoclonal antibody partially reversed the inhibition of airway hyperresponsiveness and eosinophilia by IL-12. Treatment of mice with IL-12 at the time of a second antigen challenge also prevented airway hyperresponsiveness and significantly reduced numbers of BAL inflammatory cells, reflecting the ability of IL-12 to inhibit responses associated with ongoing antigen-induced pulmonary inflammation. These data show that antigen-induced airway hyperresponsiveness and inflammation can be blocked by IL-12, which suppresses Th2 cytokine expression. Local administration of IL-12 may provide a novel immunotherapy for the treatment of pulmonary allergic disorders such as atopic asthma.     

肝细胞生长因子对ALL小鼠骨髓移植后GVHD和血清Th1/Th2相关细胞因子的影响

为了观察肝细胞生长因子 (HGF)对急性淋巴细胞白血病 (ALL)小鼠异基因骨髓移植 (allo BMT)后GVHD和血清Th1 Th2相关细胞因子的影响 ,BALB c小鼠ALL模型建立后 ,接受 11Gy全身照射 ,将昆明小鼠骨髓移植给该ALL模型小鼠。随机将BALB c小鼠分A、B两组 ,A组移植后 0天至 7天皮下注射HGF ,B组皮下注射PBS。移植后观察A、B两组的GVHD症状和肝、小肠、皮肤的病理学变化 ;移植后第 8天取血检测IFN γ和IL 4水平。结果表明 :A组的GVHD症状积分低于B组 (P <0 .0 5 ) ;A、B两组的IFN γ均高于正常组 (P值分别 <0 0 5和0 0 0 1) ,但A组低于B组 (P <0 .0 1) ;A、B两组的IL 4均低于正常组 (P <0 .0 5 ) ,而A组的IL 4高于B组 (P <0 .0 5 )。结论 :HGF可减轻GVHD的严重程度 ,与HGF有调节Th1 Th2相关细胞因子趋于平衡的作用有关。     

流式微球分析法检测血清中Th1/Th2/Th17型细胞因子的表达在肺结核病患者中的临床意义

目的探讨流式微球分析法(CBA法)检测血清Th1/Th2/Th17型细胞因子的表达在结核病患者中的临床意义。方法按照BD CBA Flex Set检测试剂盒的要求,用CBA法检测98例肺结核患者(痰涂片阳性肺结核患者38例,痰涂片阴性肺结核患者60例)和79例同期健康体检者的Th1型细胞因子(白细胞介素2、γ干扰素、肿瘤坏死因子),Th2型细胞因子(白细胞介素4、白细胞介素6、白细胞介素10)以及Th17型细胞因子(白细胞介素17A)的表达水平,并分析3组之间的差异。结果除白细胞介素17A组间、组内差异无统计学意义(P0.05)外,结核组白细胞介素2、白细胞介素4、白细胞介素6、白细胞介素10、肿瘤坏死因子、γ干扰素水平均高于对照组(P0.05);痰涂片阳性患者白细胞介素2、白细胞介素4、白细胞介素10、γ干扰素水平均高于对照组(P0.05),痰涂片阳性患者和阴性患者差异无统计学意义(P0.05);而痰涂片阳性患者白细胞介素6和肿瘤坏死因子水平均显著高于痰涂片阴性患者(P0.05)。结论白细胞介素6和肿瘤坏死因子可作为判断结核病严重程度的指标,监测结核病病情的转归。与此同时,CBA法作为1种新兴的检测技术,敏感度高,可同时检测多种细胞因子,并能大大节约血清用量与时间,因此可作为结核病检测和病情监测的实验室技术。     

Th1/Th2炎性细胞因子在老年肺气肿与肺间质纤维化中的研究

目的 探讨在中国汉族老年人群中,肺气肿和肺间质纤维化患者血Th1/Th2炎性细胞因子的浓度差异趋势.方法 选取肺气肿、肺间质纤维化老年患者和健康人各40例,采集外周静脉血5 ml,采用酶联免疫吸附法检测血清Th1/Th2炎性细胞因子水平,病例组与健康对照组的比较采用独立样本t检验,Th1/Th2炎性细胞因子之间的相关关系采用Pearson直线相关分析.结果 3组平均年龄分别为:健康人组58.26±9.21岁、肺气肿组60.26±10.43岁、肺间质纤维化组61.26±8.83岁,差异均无显著性(P＞0.05).在肺气肿组中干扰素γ(INF-γ)、白介素(IL)-2水平明显升高P ＜0.01,而Th2炎性细胞因子IL-4水平显著降低(P＜0.01),差异具有显著的统计学意义;在肺间质纤维化中,IL-2水平明显降低(P＜0.01),而IL-5、IL-10水平则明显升高(P＜0.05),差异具有统计学意义;同时结果显示细胞因子间存在正相关关系.结论 在老年肺气肿和肺间质纤维化患者Th1/Th2炎性细胞因子有显著的浓度差异变化,其结果为临床治疗提供一个新的视点与思路.     

Effects of interleukin 12 on immune responses and host protection in mice infected with intestinal nematode parasites

The cytokine interleukin (IL) 12 stimulates T cell and natural killer cell production of interferon (IFN) gamma and inhibits T cell production of IL-4. We investigated the effects of IL-12 on cytokine gene expression, immunoglobulin (Ig)E, mucosal mast cell, and eosinophil responses, and the course of infection in mice inoculated with the nematode parasite Nippostrongylus brasiliensis, as well as the IFN-gamma dependence of these effects. IL-12 stimulated IFN-gamma and IL-10 gene expression during primary and secondary N. brasiliensis infections and inhibited IL-3, IL-4, IL-5, and IL-9 gene expression during primary infections but had little inhibitory effect during secondary infections. IL-12 inhibited IgE, mucosal mast cell, and blood and tissue eosinophil responses during primary infections, but only eosinophil responses during secondary infections. IL-12 enhanced adult worm survival and egg production during primary, but not secondary infections. IL-12 needed to be administered by day 4 of a primary infection to inhibit IgE and mucosal mast cell responses, and by day 6 to strongly inhibit eosinophil responses and to enhance worm survival and fecundity. Anti-IFN-gamma mAb inhibited the effects of IL-12 on IgE secretion, intestinal mucosal mastocytosis, and parasite survival and fecundity, but did not affect IL-12 inhibition of eosinophilia. These observations indicate that IL-12, if administered during the initiation of eosinophilia. These observations indicate that IL-12, if administered during the initiation of an immune response, can change the response from one that is characterized by the production of T helper (Th)2-associated cytokines to one characterized by the production of Th-1 associated cytokines. However, IL-12 treatment has less of an effect once the production of Th2-associated cytokines has become established. In addition, our results provide evidence that Th2- associated responses protect against, and/or Th1-associated responses exacerbate, nematode infections.     

Interleukin-12 primes human CD4 and CD8 T cell clones for high production of both interferon-gamma and interleukin-10

Interleukin-12 (IL-12) induces differentiation of T helper 1 (Th1) cells, primarily through its ability to prime T cells for high interferon-gamma (IFN-gamma) production. We now report that the presence of IL-12 during the first several days of in vitro clonal expansion in limiting dilution cultures of polyclonally stimulated human peripheral blood CD4+ and CD8+ T cells also induces stable priming for high IL-10 production. This effect was demonstrated with T cells from both healthy donors and HIV+ patients. Priming for IL-4 production, which requires IL-4, was maximum in cultures containing both IL-12 and IL-4. IL-4 modestly inhibited the IL-12-induced priming for IFN-gamma, but almost completely suppressed the priming for IL-10 production. A proportion of the clones generated from memory CD45RO+ cells, but not those generated from naive CD45RO- CD4+ T cells, produced some combinations of IFN-gamma, IL-10, and IL-4 even in the absence of IL-12 and IL-4, suggesting in vivo cytokine priming; virtually all CD4+ clones generated from either CD45RO(-) or (+) cells, however, produced high levels of both IFN-gamma and IL-10 when IL-12 was present during expansion. These results indicate that each Th1-type (IFN-gamma) and Th2-type (IL-4 and IL-10) cytokine gene is independently regulated in human T cells and that the dichotomy between T cells with the cytokine production pattern of Th1 and Th2 cells is not due to a direct differentiation-inducing effect of immunoregulatory cytokines, but rather to secondary selective mechanisms. Particular combinations of cytokines induce a predominant generation of T cell clones with anomalous patterns of cytokine production (e.g., IFN-gamma and IL-4 or IFN-gamma and IL-10) that can also be found in a proportion of fresh peripheral blood T cells with "memory" phenotype or clones generated from them and that may identify novel Th subsets with immunoregulatory functions.     

流式微珠阵列法检测IFN-γ诱导的Jurkat细胞Th1/Th2细胞因子表达

本研究旨在探讨流式微珠阵列法检测Th1／Th2细胞因子表达及IFN-1应用于T淋巴细胞白血病治疗的临床价值。以不同浓度IFN-γ诱导培养Jurkat细胞48小时，用流式微珠阵列法检测培养上清液中IL-2、IL-6、TNF-α和IFN-γ表达，并采用流式细胞术检测膜上IL-2受体（CD25）的表达。结果表明：IFN-γ诱导Jurkat细胞IL-2和TNF-α的表达呈浓度依赖性升高，未检测到IL-6表达，CD25表达明显升高。结论：Jurkat细胞能被IFN-γ诱导高表达Th1细胞因子和CD25，流式微珠阵列法能准确客观地反映Th1／Th2细胞因子表达的动态变化。     

液相芯片法检测终末期肾病患者胞外Th1/Th2细胞因子与促炎细胞因子

目的探讨终末期肾脏病（ESRD）患者胞外Th1/Th2细胞因子的状况和临床意义。方法选取12例ESRD患者为实验组,12例健康人为对照组,运用液相芯片技术（SA）测定各实验组血清中Th1/Th2和促炎因子的水平,同时用酶联免疫吸附测定法（ELISA）定量检测细胞因子白细胞介素-8（IL-8）的水平。通过用ELISA和液相芯片法同时检测IL-8的相关性来评估液相芯片法的稳定性和准确性。结果ESRD患者血液透析前IL-10水平与对照组相比有所上升;血液透析后IL-1β水平与对照组相比降低;而血液透析前后肿瘤坏死因子-β（TNF-β）和IL-8水平均降低。ESRD患者血液透析后IL-1β、IL-4、IL-8和IL-10水平与血液透析前相比均有下降。在检测IL-8时,液相芯片法和ELISA表现出显著的相关性（P〈0.001,r=0.946）。结论血液透析后ESRD患者体内存在着细胞因子的变化,即Th2细胞因子IL-10上升而Th1细胞因子TNF-β和促炎因子IL-8降低。血液透析影响ESRD患者的细胞因子谱。     

HCV抗原诱导Th1/Th2细胞增殖活性分析及其在丙型肝炎诊断中的应用

目的　通过检测Th1 Th2特征性细胞因子 ,分析Th1 Th2细胞增殖活性 ,探讨其在丙型肝炎慢性化进程中的免疫学作用 ,研究HCV感染者肝病慢性化的免疫学因素。方法　首先用淋巴细胞分离液分离丙肝病毒感染者的PB MC ,纯化其CD+4T细胞 ,然后用HCV混合Ag刺激培养CD+4T细胞 ,最后用ELISA法检测IL 2、IL 4的含量 ,分析Th1和Th2细胞增殖活性。结果　本课题研究病例共包括 2 3例急性肝炎病例 (其中 7例呈自限性病程 ,16例转变为慢性肝炎 )和 2 0例慢性肝炎病例 ,以上病例CD+4T细胞经HCV混合抗原刺激培养后 ,其中 7例急性自限性病例表现为Th1样反应 (IL 2分泌增加 ) ,与 16例急性转慢性病例比较有显著性差异 (t =2 1.76、P <0 .0 1) ;7例自限性病例在HCVAg刺激前后Th1样反应有显著性差异 (t =18.15、P <0 .0 1)。 16例急性转慢性病例表现为Th2样反应 (IL 4分泌增加 ) ,与 7例自限性病例比较有显著性差异 (t =7.75、P <0 .0 1) ;16例急性转为慢性病例在HCVAg刺激前后Th2样反应有显著性差异 (t=4 .0 8、P<0 .0 1)。 2 0例慢性化病例主要为Th2样反应 ,其与急转慢性病例无显著性差异 (t=1.0 1、P >0 .0 5 )。结论　HCVAg能够特异性地刺激Th前体细胞向Th1或Th2细胞分化 ;Th1样应答与疾病的好转有关 ,Th2样应答与慢性化有     

休克期切痂对烫伤大鼠Th1/Th2型细胞因子的影响

目的：探讨烫伤大鼠伤后不同时间切痂对辅助性T淋巴细胞亚群Th1／Th2细胞功能性极化的影响。方法：160只健康雄性Wistar大鼠制备背部30％总体表面积Ⅲ度烫伤模型，随机分为单纯烫伤对照组以及伤后8、24和96h切痂组。在伤后4、12、24、48、96、120和168h活杀动物采集血液和脾脏标本；酶联免疫吸附法(ELISA)检测血浆、脾脏匀浆中的γ-干扰素(IFN-γ)和白介素-4(IL-4)含量。结果：烫伤4h大鼠上述细胞因子均迅速上升，Th1型细胞因子IFN-γ在伤后24h达峰值，其后逐渐下降；Th2型细胞因子IL-4进行性升高；伤后7d出现明显偏向Th2型反应的现象。切痂组两型Th细胞因子的变化幅度小于单纯烫伤对照组，其中8h切痂组变化最小，24h和96h切痂组次之。结论：休克期切痂有利于抑制严重烧伤后Th2的漂移。     

支气管哮喘气道炎症表型与Th1/Th2和IgE的相关研究

目的 分析不同气道炎症表型的支气管哮喘患者的循环血辅助性T细胞1/2(Th1/Th2)和IgE水平与临床特征的关系。方法 选择2017年6月至2018年12月于该院诊断为支气管哮喘患者共180例,根据诱导痰液中性粒细胞(Neu)和嗜酸粒细胞(Eos)百分比分为Neu组、Eos组、混合组和寡细胞组,检测循环血Th1/Th2和IgE水平,Th1细胞分泌细胞因子血清干扰素-γ(IFN-)γ和Th2细胞分泌白细胞介素-4(IL-4),比较各组患者的临床特征。结果 Eos组和混合组的Th1/Th2(0.56±0.12、0.59±0.15)明显低于Neu组(0.77±0.23)和寡细胞组(0.72±0.19),但IgE水平[(12.3±4.5)、(11.9±4.3)mg/L],比Neu组和寡细胞组[(7.6±3.2)、(7.2±3.1)mg/L]增加,IFN-γ[(32.6±9.5)、(30.5±8.6)mg/L比(21.2±6.8)、(20.9±5.7)mg/L]和IL-4[(25.7±6.8)、(23.3±6.5)mg/L比(12.4±4.3)、(11.5±4.2)mg/L]水平升高,差异有统计学意义(P<0.05)。Neu组和混合组患者哮喘病程和严重程度明显大于其他两组,吸烟和气道感染率增加;Eos组和混合组患者过敏性鼻炎和皮肤点刺试验阳性率高于其他两组,差异有统计学意义(P<0.05)。4种炎症表型组患者的肺功能包括第1秒用力呼气容积(FEV1)及与用力肺活量的比值(FEV1/FVC)、用力呼气中段流量(MMEF%)、50%用力呼气流量(FEF 50%)和75%用力呼气流量(FEF 75%)比较差异无统计学意义(P>0.05)。结论 支气管哮喘患者具有不同的炎症细胞表型,与循环血Th1/Th2和IgE水平以及临床特征有密切联系。     

霉酚酸对小鼠树突状细胞体外成熟和免疫功能的影响

霉酚酸酯(mycophenolate mofetil，MMF)是一种新型免疫抑制剂，目前已被临床上广泛应用于异基因骨髓移植。本研究的目的是观察其免疫活性成分霉酚酸(mycophenolic acid MPA)对小鼠树突状细胞(dendritic cell，DC)体外成熟和免疫学功能的影响，以期进一步探讨MPA防治移植物抗宿主病(graft versus host disease，GVHD)免疫抑制作用的机理。在小鼠DC体外培养时加入两种剂量(0．01μmol／L和0．1μmol/L)的MPA处理，观察DC的生成情况，以流式细胞仪分析各处理组细胞的免疫表型，以^3H-TdR掺入值来反映DC的抗原呈递功能，并作体外混合淋巴细胞反应观察其对同种T细胞的刺激增殖能力，用ELISA方法测定其分泌的IL-12水平及与同种T细胞共同培养时IL-2，IFN-γ，IL-4和IL-10等细胞因子水平。结果表明：经MPA培养后，DC的生成和形态没有影响，表达低水平的共刺激分子CD40，CD80和CD86，其分泌的IL-12水平明显下降，DC的抗原呈递功能和刺激同种T细胞的功能显著下降，并促使T细胞分泌的Th1细胞因子IL-2和IFN-γ下降，而Th2细胞因子IL-4，IL-10上升。结论：霉酚酸能使小鼠骨髓来源的树突状细胞停留在未成熟状态，对其免疫学功能起负性调节作用，并促使Th1细胞因子向Th2细胞因子转移。