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.     

内毒素诱导的大鼠急性肺损伤与Th1/Th2类细胞因子失衡

目的　探讨内毒素诱导的肺损伤与Th1/Th2平衡的关系。方法　采用颈静脉注入 ,LPS复制大鼠急性肺损伤模型 ,用ELISA法检测其外周血单个核细胞 (PBMC)产生IFN γ、IL 4水平及IFN γ/IL 4比值。结果　与正常对照组相比 ,急性肺损伤组外周血PBMC产生IFN γ水平和IFN γ/IL 4比值明显升高 (P<0 0 5 ;P <0 0 0 1) ,而IL 4水平差异无显著性 (P >0 0 5 ) ,肺组织病理切片显示大鼠发生ALI。结论　LPS诱导的肺损伤 ,体内存在Th1/Th2类细胞因子水平失衡     

神经生长因子在哮喘小鼠Th1/Th2失衡中的作用研究

目的 探讨神经生长因子(NGF)在哮喘小鼠Th1/Th2失衡中的作用.方法 30只小鼠随机分为3组:正常对照组、哮喘组、NGF阻断组.卵白蛋白雾化吸入建立小鼠哮喘模型.ELISA法测定血清IL-4及IFN-γ的水平,RT-PCR法检测肺组织GATA-3 mRNA的表达.结果 各组血清IL-4水平(pg/ml)分别为114.23±15.00、151.17±19.04、134.67±13.44,哮喘组IL-4含量显著高于正常对照组,NGF阻断组IL-4含量低于哮喘组,P＜0.05.各组血清IFN-γ水平(pg/ml)分别为29.34±6.84、17.16±4.43、23.34±5.79,哮喘组IFN-γ含量低于正常对照组,NGF阻断组IFN-γ含量高于哮喘组,P<0.05.哮喘组较正常对照组肺组织GATA-3 mRNA表达明显增强,NGF阻断组肺组织GATA-3 mRNA表达较哮喘组减弱,P<0.05,结论 NGF可能通过对GATA-3表达的增强参与Th1/Th2类细胞因子免疫失衡.     

抑制性ODN对溃疡性结肠炎小鼠Th1/Th2免疫失衡的调节作用

目的 研究抑制性ODN对溃疡性结肠炎小鼠Th1/Th2免疫失衡的调节作用.方法 首先利用我们已发表的研究[1]中的方法建立小鼠溃疡性结肠炎模型.建模成功后将结肠炎小鼠随机分为两组,分别给予腹腔内注射PBS、A151,记作PBS＋UC组、A151＋UC组,同时设一组健康小鼠对照并给予腹腔注射PBS,记作PBS＋健康对照组.每组分别连续注射7天,末次注射后7天取小鼠血清并分离小鼠结肠组织制备匀浆.利用ELISA方法检测血清及结肠匀浆中IL-6、TNF-α、IL-10 、IL-4水平.结果经检测发现抑制性ODN能明显下调IL-6和TNF-α的水平,而上调IL-10和IL-4水平.结论 抑制性ODN对小鼠溃疡性结肠炎的抑制作用或许是通过调节Th1/Th2平衡来实现的.     

Kinetic Th1/Th2 responses of transgenic mice with bacterial meningitis induced by Haemophilus influenzae

To investigate the kinetic Th1/Th2 immunopathogenic mechanisms of Haemophilus influenzae meningitis, we established a murine experimental model of meningitis and elucidated the Th1/Th2 immune responses in T1/T2 doubly transgenic mice based on a BALB/c background under the control of the IFN-gamma (interferon-gamma)/IL-4 (interleukin-4) promoters respectively. NTHi (non-typeable Haemophilus influenzae) meningitis was induced in these mice by inoculation with either a colonized (CNTHi) or invasive (INTHi) strain of NTHi. Mice inoculated with CNTHi displayed a less severe degree of disease in terms of clinical symptoms, mortality rate and brain histopathology. Conversely, INTHi-inoculated mice had more severe clinical symptoms. CNTHi-inoculated mice had a more significant Th1 response in terms of a higher percentage and longer maintenance of Th1 cells, and more production of IFN-gamma from strain-specific antigen-stimulated splenocytes than INTHi-inoculated mice. In contrast, INTHi-inoculated mice had a more significant Th2 response. This was due to a significant increase in IL-4-producing CD4(+) T-cells (Th2 cells) and more production of IL-4 from strain-specific antigen-stimulated splenocytes accompanied by a rapid decline of Th1 cells in INTHi-inoculated mice. In conclusion, the preferential Th1/Th2 trend in this murine model of NTHi meningitis is correlated with clinical severity as well as isolated characteristics of the pathogens themselves.     

急性冠状动脉综合征患者IL-18／IL-10比值与Th1／Th2失衡

目的研究免疫炎性因子在急性冠状动脉综合征（ACS）中的作用机制。方法入选经冠状动脉造影确诊的ACS患者189例，26名正常人作对照。入院时即采血，并随防观察有无心脏病死亡、心绞痛再发、再梗死、心律不齐等发生。采用流式细胞术检测辅助性T细胞（Th）1与Th2，酶联免疫吸附试验（ELISA）检测白细胞介素（IL）-18和IL-10表达。结果ACS患者Th1、IL-18较正常人明显增加（P〈0．01，P〈0．05），而Th2和IL-10明显减少（P均〈0．05），Th1／Th2与IL-18／IL-10呈正相关（r=0．532，P〈0．01）。结论ACS患者Th1／Th2和IL-18／IL-10比值升高，提示ACS患者动脉斑块形成与Th1细胞及其分泌的前炎性因子IL-18升高有关。     

大鼠分泌性中耳炎中耳Th2/Th1细胞失衡模式的研究

目的探讨大鼠分泌性中耳炎中耳微环境中的Th2/Th1细胞失衡模式。方法选用SD大鼠20只,随机分为实验组和对照组,每组各10只(20耳)。实验组以卵清蛋白腹腔致敏后耳内激发制成分泌性中耳炎(OME)模型,对照组以PBS替代卵清蛋白。耳内激发后2d处死动物,采用HE染色切片观察各组中耳黏膜病理变化及炎症细胞的改变,采用ELISA法测定各组大鼠中耳腔灌洗液中Th2型细胞因子白介素4(IL-4)和Th1型细胞因子干扰素γ(IFN-γ)的含量,免疫组化染色检测中耳黏膜和骨髓腔中IL-4、IFN-γ的表达。结果实验组与对照组比较中耳灌洗液中IL-4含量、Th2/Th1(IL-4/IFN-γ)比值以及中耳黏膜和骨髓腔中IL-4表达、Th2/Th1(IL-4/IFN-γ)比值均出现一致性增高,差异均有统计学意义(P<0.05);而中耳微环境中IFN-γ含量组间差异无统计学意义(P>0.05)。结论在变应原刺激下OME大鼠中耳微环境中IL-4合成显著增高,而IFN-γ相对减少,Th2/Th1比值增高,存在以Th2亢进为特征的Th2/Th1细胞失衡反应,中耳微环境的Th2/Th1细胞失衡模式是分泌性中耳炎重要的免疫学发病机制之一。     

Th1/Th2类细胞因子失衡和一氧化氮合酶在内毒素休克性肺损伤中的作用机制

目的　观察内毒素 (LPS)诱导的急性肺损伤 (ALI)大鼠血Th1/Th2类细胞因子浓度以及肺组织一氧化氮合酶 (NOS)活性和NOS基因表达 ,以探讨它们在ALI中的发病机制。方法　采用颈静脉注入LPS复制大鼠急性肺损伤模型 ,用ELISA法检测其外周血单个核细胞产生IFN -γ、IL - 4水平及IFN -γ/IL - 4比值 ;用放射免疫 (RIA)的方法测定LPS注射后大鼠肺组织NOS活性 ;采用逆转录聚合酶链反应 (RT -PCR)检测LPS注射大鼠肺组织内源型一氧化氮合酶 (eNOS)、诱导型一氧化氮合酶 (iNOS)mRNA表达情况。结果　与正常对照组相比 ,急性肺损伤组外周血PBMC产生IFN -γ水平、IFN -γ/IL - 4比值明显升高 (P <0 0 5 ,P <0 0 0 1) ,而IL - 4水平差异无显著性 (P >0 0 5 ) ,同时伴随NOS活性 [( 0 30± 0 0 5 )U/mgpro]明显高于对照组 [( 0 2 4± 0 0 3) ,P <0 0 5 ]。iNOSmRNA表达( 0 70± 0 2 0 )显著高于对照组 (P <0 0 5 ) ,eNOSmRNA表达未见明显变化 (P >0 0 5 )。肺组织病理切片显示大鼠发生ALI。结论　LPS休克肺损伤时 ,体内存在Th1/Th2类细胞因子水平失衡 ,同时伴有NOS活性增高 ,而NOS的主要来源为iNOS基因表达增强