Gamma-interferon (IFN-gamma) augments apoptotic response to mistletoe lectin-II via upregulation of Fas/Fas L expression and caspase activation in human myeloid U937 cells

Mistletoe lectin-II, a major composition of Korean mistletoe (Viscum album coloratum), is known as a potent apoptosis inducer. The previous research has demonstrated that Korean mistletoe lectin-II induces apoptosis via c-Jun N terminal kinase (JNK) activation in human myeloid U937 cells. The purpose of this research is to prove the synergistic action of mistletoe lectin-II and interferon-γ (IFN-γ) in the apoptotic cytotoxicity of U937. When U937 cells were treated with mistletoe lectin-II after being differentiated by IFN-γ, the proteolytic activity of caspase-3 and 9 was markedly elevated and that of caspase-8 was prolonged for 18 hr. The activation of caspase-3-like protease requires the earlier cleavage of poly(ADP-ribose) polymerase(PARP). Caspase-1 was, however, not activated during the resting phase and nor in IFN-γ-differentiated U937 cells. Western blot analysis revealed that, in IFN-γ-differentiated U937 cells, the expression of Fas (CD95/APO-1) & Fas ligand(FasL) increases the apoptotic sensitivity against Mistletoe lectin-II. Fas (CD95/APO-1) & FasL were not significantly induced solely by mistletoe lectin-II. Furthermore the activity of JNK1 in U937 cells was also markedly increased with IFN-γ-differentiation, compared to that of the control. These results suggest that the IFN-γ-differentiation of U937 cells increases the susceptibility to mistletoe lectin-II-induced apoptosis.     

The effects of inflammatory cytokines on steroidogenic acute regulatory protein expression in macrophages

Objective: To investigate the expression of steroidogenic acute regulatory protein (StAR) in macrophages and the effects of inflammatory cytokines on StAR expression. Methods: The macrophages isolated from ApoE knockout mice and C57BL/6J mice and RAW264.7 cells (a cell line from mouse macrophage. ATCC Number: TIB-71^TM) were cultured in DMEM containing 10% fetal bovine serum. RAW264.7 cells were treated with different inflammatory cytokines (TNF-α, IFN-γ and TGF-β1) and 8-Br-cAMP, a cAMP analog. RT-PCR and Western blot analysis were applied to evaluate the effects of inflammatory cytokines on StAR expression. Results: RT-PCR and Western blot analysis demonstrated the expression of StAR in the macrophages isolated from ApoE knockout mice, C57BL/6J mice and RAW264.7 cells. Proinflammatory cytokines TNF-α and IFN-γ significantly decreased StAR mRNA and protein levels in RAW264.7 cells. The inhibition was dose- and time-dependent. In contrast, anti-inflammatory cytokine TGF-β1 increased StAR mRNA and protein levels. At 1:15 molecular ratio, TGF-β1 blocked the down-regulation of StAR expression mediated by TNF-α. cAMP also induced StAR expression in RAW264.7 cells. When the cells were co-treated with 8-Br-cAMP and TNF-α, 8-Br-cAMP failed to induce StAR expression. Conclusion: Our results provide interesting evidence that inflammatory cytokines regulate StAR expression in macrophages. Received 12 August 2006; returned for revision 28 September 2006; returned for final revision 28 May 2007; accepted by M. Katori 22 June 2007     

干扰素γ基因内含子1+874位点多态性与乙型肝炎病毒感染关系的研究

目的 研究干扰素γ（IFN-γ）基因内含子1＋874位点多态性与乙型肝炎病毒（HBV）感染、转归的关系,探讨慢性HBV感染的遗传易感因素.方法 采用序列特异性引物-聚合酶链反应（PCR-SSP）技术检测231例慢性HBV携带患者、165例自限性HBV感染者和135名正常对照者IFN-γ基因内含子1＋874位点T/A单核苷酸多态性.结果 慢性HBV感染组IFN-γ基因＋874位点AA基因型频率（TT、TA、AA频率分别为9.1%、12.1%、78.8%）高于正常对照组（TT、TA、AA频率分别为12.6%、23.0%、64.4%）（x2=9.60,P=0.008）;而自限性HBV感染组（TT、TA、AA频率分别为13.9%、23.7%、62.4%）和对照组之间差异无显著性（x2=0.16,P=0.92）.结论 IFN-γ基因内含子1＋874位点多态性与慢性HBV感染有关,该位点多态性可能在决定个体HBV感染遗传易感性方面有一定意义.     

充血性心力衰竭患者细胞免疫功能失调的探讨

目的探讨充血性心力衰竭(CHF)患者外周血辅助性T淋巴细胞功能失调及其在心力衰竭发生及发展中的意义。方法选择62例CHF患者作为研究组,其中,心功能Ⅱ级28例,Ⅲ级16例,Ⅳ级18例;30例健康志愿者作为对照组。采用流式细胞分析法,检测所有被检者外周血CD4 细胞胞内细胞因子干扰素γ(IFN-γ)和白细胞介素4(IL-4)的表达。同时分离外周血单个核细胞,经植物血凝素(PHA)刺激培养后,应用酶联免疫吸附方法(ELISA)检测培养上清液中IFN-γ和IL-4水平。结果CHF组患者IFN-γ染色阳性的细胞占CD4 T细胞的比率为17.48%,明显高于对照组的12.09%。IL-4染色阳性细胞比率两组间未见显著差异。ELISA检测显示心力衰竭组培养上清液中IFN-γ水平及IFN-γ/IL-4比值明显高于对照组,而两组间IL-4水平则无显著差异。结论心力衰竭患者辅助性T淋巴细胞功能与心功能之间有一定关系,辅助性T淋巴细胞功能失调可能参与了CHF患者的心室重构过程。     

苦参碱对刀豆蛋白A致小鼠肝损伤的保护作用

目的探讨苦参碱对刀豆蛋白 A(Con A)所致肝损伤的防治作用.方法 48只 NIH小鼠随机分为正常对照组、模型组、苦参碱 25 mg/kg组、苦参碱 12.5 mg/kg组和联苯双酯治疗组.除正常对照组外,其他组于实验首日静脉注射 Con A 20 mg/kg,苦参碱两个剂量组均采用尾静脉注射给药,联苯双酯组按 150 mg/kg灌胃口服,每天 1次,连续 3 d,末次给药后 4 h,再次静脉注射 Con A 20 mg/kg,8 h后检测血浆 ALT活性及 IFN-γ和 TNF-α含量,观察肝组织病理学变化.结果苦参碱 25 mg/kg组、12.5 mg/kg组小鼠 ALT活性及 IFN-γ和 TNF-α含量均明显低于模型组,有显著性差异(P<0.01);苦参碱两个剂量组肝脏病理改变明显减轻.结论苦参碱对 Con A所致小鼠肝损伤具有较好的防治作用,抑制 T淋巴细胞活化和 IFN-γ、TNF-α的释放可能是其主要的作用机制.     

瑞芬太尼对无痛人流患者的麻醉效果及IFN-γ、IL-10、NF-κB的变化研究

[目的]探讨瑞芬太尼对无痛人流患者的麻醉效果及干扰素-γ(IFN-γ)、白介素-10(IL-10)、核因子κB(NF-κB)变化的影响.[方法]于本院进行无痛人流患者140例,将其随机分为两组,观察组采用瑞芬太尼联合丙泊酚麻醉,对照组单纯采用丙泊酚麻醉.比较两组术中麻醉效果,术后苏醒时间以及对IFN-γ、IL-10、N...     

γ干扰素释放试验诊断儿童潜伏结核菌感染的Meta分析

目的以结核菌素皮肤试验(TST)为参考试验,评价QuantiFERON-TB Gold test(QFT)和T-SPOT.TB两种IFN-γ释放试验诊断儿童潜伏结核菌感染的准确性。方法计算机检索EMBASE、PubMed、Cochrane图书馆、中文科技期刊全文数据库、中国期刊全文数据库和万方数字化期刊群等数据库,检索时间均为建库至2010年3月。全面检索IFN-γ释放试验诊断儿童潜伏结核菌感染的文献,按照诊断试验的纳入标准筛选文献,提取纳入文献的特征信息(研究背景、设计信息和诊断参数信息)。根据QUADAS质量评价标准评价纳入文献的质量。采用Meta-Disc1.4软件进行Meta分析,检验异质性,并根据异质性结果选择相应的效应模型。对纳入文献予以加权定量合并,计算汇总敏感度、特异度、阳性似然比、阴性似然比和诊断优势比及其95%CI,绘制汇总受试者工作特征(SROC)曲线,并计算曲线下面积(AUC)。结果共检出相关文献285篇,按照文献纳入标准,最终纳入13篇文献(英文文献12篇和中文文献1篇)。10篇文献报道了QFT试验对儿童潜伏结核菌感染的诊断价值,汇总敏感度为0.40(95%CI:0.37~0.44)、汇总特异度为0.87(95%CI:0.85~0.88)、汇总阳性似然比为6.21(95%CI:3.07~12.54)、汇总阴性似然比为0.46(95%CI:0.31~0.68)、汇总诊断优势比为15.58(95%CI:7.47~32.48),SROC AUC为0.8931。4篇文献报道了T-SPOT.TB试验对儿童潜伏结核菌感染的诊断价值,汇总敏感度为0.74(95%CI:0.68~0.79)、汇总特异度为0.84(95%CI:0.81~0.87)、汇总阳性似然比为4.66(95%CI:1.27~17.12)、汇总阴性似然比为0.42(95%CI:0.18~0.99)、汇总诊断优势比为13.71(95%CI:3.71~50.72),SROCAUC为0.8306。结论 IFN-γ释放试验适用于进一步鉴别诊断儿童是否处于潜伏结核菌感染,不适合儿童潜伏结核菌感染的筛查。     

支气管哮喘病儿外周血单核细胞中LncRNA MEG3的表达及其与肺功能、免疫功能的相关性研究

目的 探讨支气管哮喘病儿外周血单核细胞中长链非编码RNA母系表达基因3(LncRNA MEG3)的表达及其与肺功能和免疫功能的相关性.方法 选取2017年10月至2018年9月安阳市妇幼保健院收治的支气管哮喘病儿60例为观察组,根据疾病严重程度分为轻度组(20例),中度组(20例),重度组(20例),同时选取同期体检的...     

哮喘大鼠黏液分泌与Th1/Th2失衡的关系及地塞米松的调节作用

目的探讨气道黏液高分泌与Thl/Th2平衡的关系,以及地塞米松(Dex)对哮喘大鼠气道黏液高分泌及杯状细胞表达的影响。方法30只大鼠随机分为对照组、哮喘组和Dex组,每组10只。哮喘组和Dex组以卵白蛋白激发制作大鼠哮喘模型,Dex组腹腔内注入Dex作为干预因素。分别以HE、阿辛兰染色观察气道上皮的改变、杯状细胞的表达及黏液生成,ELISA法检测血清及支气管肺泡灌洗液(BALF)白细胞介素13(IL-13)和γ干扰素(IFN-γ)的浓度。结果哮喘组较对照组气道上皮杯状细胞数量明显增加(P<0.05),黏液生成增多(P<0.05),血清及BALF中IL-13表达水平显著增高(P均<0.05),IFN-γ表达水平降低(P均<0.05)。Dex组较哮喘组杯状细胞数量显著减少(P<0.05),黏液分泌减少(P<0.05),血清及BALF中IL-13表达水平明显降低(P均<0.05),IFN-γ表达水平升高(P<0.05)。结论Th2型细胞因子IL-13在哮喘大鼠气道上皮杯状细胞化生和黏液高分泌中发挥了重要作用,而Dex可以通过抑制IL-13的表达而减少气道黏液分泌。     

脑脊液γ-干扰素检测对结核性脑膜炎诊断价值的探讨

目的探讨血清及脑脊液的γ-干扰素水平对结核性脑膜炎诊断的临床价值。方法采用酶联免疫吸附试验(ELISA)检测28例结核性脑膜炎、30例病毒性脑膜炎患者血清及脑脊液及31例健康对照组血清的γ-干扰素水平。结果结核性脑膜炎患者脑脊液γ-干扰素含量为(327.3±86.8)ng/L,明显高于病毒性脑膜炎组[(38.6±14.3)ng/L](P<0.01),且重叠性很小;而两组血清含量很低并相近,与健康对照组比较无显著差异(P>0.05)。脑脊液γ-干扰素诊断结核性脑膜炎的敏感性、特异性、准确性分别为100%、97.8%、98.5%。结论检测脑脊液γ-干扰素对诊断结核性脑膜炎有较大的辅助意义。