雷公藤对豚鼠哮喘模型核因子-κB表达的作用

目的　探讨雷公藤对核因子 κB(NF κB)在豚鼠哮喘模型中表达的影响。方法　豚鼠用 10 %卵白蛋白 (OA)溶液1ml腹腔注射致敏 ,2wk后用 1%OA溶液超声雾化吸入致其哮喘发作 ,每日 1次 ,共 1wk ;测定肺功能并观察气道壁嗜酸性粒细胞 (EOS)浸润情况 ;用免疫组织化学染色方法观察NF κB在豚鼠肺组织中的表达变化。结果　NF κB主要表达在气道壁内的细胞 ,对照组、模型组、雷公藤内酯醇 ( 10 0mg·kg-1ip)组的胞核阳性的细胞数占气道上皮细胞数百分比分别为 14 3 %± 2 6%、3 2 5 %± 5 8%和 19 7%±2 1%。结论　雷公藤内酯醇能显著抑制哮喘豚鼠气道壁内细胞NF κB的表达 ,可能是雷公藤治疗哮喘的作用机制之一。     

雷公藤对豚鼠哮喘模型血红素氧合酶-1活性的作用研究

目的:探讨雷公藤对血红素氧合酶-1(HO-1)在豚鼠哮喘模型中表达的影响。方法:将18只豚鼠随机分为3组,每组6只:(1)正常组;(2)模型组:用10%卵清蛋白(()VA)溶液1 ml 腹腔注射致敏,2周后用1%OVA 溶液超声雾化吸入致其哮喘发作(简称诱喘),每日1次,共1周;(3)治疗组:诱喘同 B 组,每日1次,每次诱喘后给予腹腔注射雷公藤内酯醇100 μg/kg,共1周。测定全血一氧化碳血红蛋白(COHb)的百分比含量,并观察气道壁嗜酸性粒细胞(EOS)浸润情况;用免疫组织化学染色方法观察 HO-1在豚鼠肺组织中的表达变化。结果:HO-1主要表达在气道上皮细胞,3组(正常组、模型组和治疗组)HO-1阳性表达的平均吸光度(OD 值)分别为0.032±0.004、0.123±0.011和0.082±0.009。模型组 HO-1的表达水平显著高于正常组(P<0.01),治疗组 HO-1表达水平显著低于模型组(P<0.01)。结论:雷公藤内酯醇能显著抑制哮喘豚鼠气道上皮细胞 HO-1的表达,提示雷公藤抑制 HO-1的表达可能是雷公藤治疗哮喘的作用机制之一。     

Dickkopf-3在非小细胞肺癌组织中的表达及其临床意义

目的：研究抑癌基因Dickkopf-3在非小细胞肺癌组织中的表达及其与肺癌临床指标间的关系,以探讨其在肺癌发生发展中的作用。方法：应用免疫组织化学技术检测Dkk-3蛋白在50例非小细胞肺癌和20例肺良性疾病组织中的表达,染色强度作半定量评分。结果：Dkk-3在非小细胞肺癌组织中阳性表达率为52%（26/50）,而在肺良性疾病组织中阳性表达率为85%（17/20）,并且Dkk-3在非小细胞肺癌组织中的表达水平显著低于肺良性疾病肺组织（ P <0.05）。Dkk-3在Ⅲ、Ⅳ期肺癌组织中的阳性表达率显著低于Ⅰ和Ⅱ期中的表达,并且染色强度也相应低于Ⅰ、Ⅱ期;已有淋巴结转移的肺癌组织中Dkk-3阳性表达率及染色强度均显著低于无淋巴结转移的肺癌组织（ P <0.05）;Dkk-3在不同性别以及肺鳞癌和腺癌组织中的表达无明显差异（ P >0.05）。结论：Dkk-3基因的低表达可能在非小细胞肺癌的发生发展中起一定作用,可能是一种潜在的肺癌抑癌基因。     

支气管哮喘患者外周血CD4+ CD25+调节性T细胞水平及Foxp3 mRNA表达的分析

目的 观察支气管哮喘(哮喘)患者外周血单个核细胞(PBMCs)中CD4+ CD25+调节性T细胞(Treg)水平及叉状头/翅膀状螺旋转录因子(Foxp3)mRNA表达的变化,探讨CD4+ CD25+ Treg在哮喘发病中的作用.方法采用流式细胞仪检测78例哮喘患者(急性发作期组30例,慢性持续期组25例,缓解期组23例)和29例健康志愿者(正常对照组)PBMCs中CD4+ CD25+ Treg的比例;反转录-聚合酶链反应(RT-PCR)检测PBMCs中Foxp3 mRNA的表达.结果 急性发作期组和慢性持续期组PBMCs中CD4+ CD25+ Treg的比例及Foxp3 mRNA的表达明显低于缓解期组和正常对照组(P＜0.05);缓解期组CD4+ CD25+ Treg的比例及Foxp3 mRNA的表达虽亦低于正常对照组,但差异无统计学意义(P＞0.05);急性发作期组CD4+ CD25+ Treg的比例及Foxp3 mRNA的表达低于慢性持续期组(P＜0.05).结论 哮喘患者外周血中具有免疫抑制活性的CD4+ CD25+ Treg数量减少,功能下降,可能参与哮喘的发生和发展.     

Increased Expression of PI-3K in Asthmatic Rat T Lymphocytes

In order to explore the expression of PI-3K in T lymphocytes of asthmatic rats and the relationship between PI-3K and activation of T lymphocytes, 24 Wistar rats were randomly divided into 4 groups: normal control group, asthmatic one-week group, asthmatic two-week group and asth-matic four-week group. T cells were purified from blood of each rat and the expression of PI-3K was observed by immunocytochemical fluorescence staining, the semiquantitative fluorescence intensity was measured by HPIAS-2000 analytic software, and the expression of IL-4 in supernatants was de-tected by ELISA. The results showed that the fluorescence intensity of T lymphocytes in asthmatic groups was significantly higher than that in normal control (P<0.001), indicating that the expression of PI-3K in T lymphocytes of asthmatic rats was significantly higher than that in those of normal controls, and the difference between acute and chronic stage asthmatic groups was significant (P<0.05). The expression levels of IL-4 protein in supernatants of asthmatic T lymphocytes were sig-nificantly higher than those in the normal controls (P<0.05). There was a significant positive correla-tion between the expression of PI-3K in T lymphocytes and the IL-4 protein expression in super-natants (r=0.583, P<0.01). It was suggested that PI-3K signal pathway may participate in the proc-esses of activation and other cytological effects of asthmatic T lymphocytes, thus may play an impor-tant roles in the pathogenesis of asthma.     

Inhibitory activity of nuclear factor-κB potentiates cisplatin-induced apoptosis in A549 cells

Whether inhibiting the activity of nuclear factor （NF）-κB potentiates cisplatin-induced apoptosis in non-small cell lung cell line A549 cells was investigated. The recombinant plasmid pcDNA3.1（＋）/IκBα expressing IκBα was constructed. The in vitro cultured A549 cells were transfected with pcDNA3.1 （＋）/IκBα alone, or pcDNA3.1（＋）/IκBα combined with cisplatin. The mitochondrial membrane potential （△ψm） was determined by rhodamine 123, the activity of caspase-3 was tested by colorimetric assay, and cell apoptosis was detected by flow cytometry with the annexin V/propidium iodide assay. The results showed that the activity of NF-κB in A549 cells was inhibited by transfecting pcDNA3.1（＋）/IκBα. Transfection of pcDNA3.1（＋）/IκBα alone did not promote apoptosis. Treatment of cisplatin alone had a little effect on cell apoptosis. Transfection of pcDNA3.1（＋）/IκBα combined with cisplatin treatment significantly induced apoptosis of A549 ceils. It was concluded that inhibiting the activity of NF-κB potentiated cisplatin-induced apoptosis of A549 cells.     

支气管哮喘治疗新药的开发及临床应用

支气管哮喘是临床常见的慢性气道炎症性疾病,尽管大部分哮喘患者可从支气管哮喘规范化治疗方案中获益,但仍有部分哮喘患者症状难以控制并持续加重。近年来随着哮喘发病机制的深入研究,哮喘临床冶疗取得了较大进展和突破,很多新药的出现为哮喘的治疗提供了更多的选择。本文综述支气管哮喘治疗新药的开发和临床应用评价。     

survivin基因在非小细胞肺癌中的表达及与P53、c-myc、k-ras蛋白表达的关系

目的：探讨survivin基因在非小细胞肺癌（NSCLC）中的表达,及与P53、c-myc、k-ras蛋白表达的相互关系。方法：逆转录PCR法检测了76例NSCLC肿瘤组织,20例良性瘤样病变和21例病灶旁正常肺组织survivin mRNA表达,免疫组织化学法检测P53,c-myc,k-ras蛋白表达,并将结果进行了相关分析。结果：61％NSCLC癌组织表达survivin mRNA基因,而良性瘤样病变和正常组织则分别为30％和19％（P＜0．001）。survivin基因表达与肺癌组织细胞类型,分化程度,TNM分期及淋巴结转移无明显相关关系。P53蛋白,c-myc与survivin基因表达显著相关,k-ras蛋白表达与survivin基因表达未见明显相关。结论：（1）survivin基因在肺癌组织中表达上调,提示该基因对NSCLC发生发展起重要作用。Survivin基因有望成为肺癌基因治疗的新靶点。（2）抑癌基因P53的失活和癌基因c-myc的上调与survivin基因的表达可能在NSCLC癌变中起协同作用。survivin和k-ras基因则可能通过各自不同的机制参与NSCLC的发病机制。     

抗白介素-5治疗支气管哮喘的研究进展

白介素（IL）-5主要由Th2细胞分泌,与气道的慢性炎症和高反应性有关,其在支气管哮喘的发生发展中具有重要作用。近年国内外报道的多项抗IL-5治疗的动物试验和临床研究均取得可喜成果。本文简要介绍抗IL-5治疗方案用于支气管哮喘的疗效及临床地位和研究进展。