IFN-γ上调Th17/IL-17应答介导衣原体呼吸道感染免疫保护

目的 探讨IFN-γ在小鼠沙眼衣原体感染中对Th17/IL-17应答的调节作用.方法 利用沙眼衣原体鼠肺炎株小鼠呼吸道感染模型,用抗鼠IFN-γ单克隆抗体吸入中和肺组织IFN-γ,对照组给予同等剂量的独特型抗体IgG2a,于感染后7 d处死小鼠.免疫酶法检测小鼠肺组织衣原体生长;利用RT-PCR技术检测衣原体感染小鼠肺组织中Th17相关因子IL-17及其上游因子IL-23 mRNA的表达;细胞内细胞因子染色检测衣原体感染小鼠脾脏IL-17-CD4+T细胞的扩增.结果 与对照组相比,IFN-γ抗体中和小鼠有严重的疾病状态,包括明显的体重下降、肺组织更高的衣原体负荷和肺组织更严重的病理损伤;肺组织IL-17和IL-23 mRNA的表达水平显著降低;脾脏IL-17-CD4+T细胞百分率也显著降低.结论 小鼠衣原体感染中,IFN-γ通过上调Th17/IL-17应答起保护作用.

Abstract：

Objective To investigate the regulation of IFN-γ to Th17 response in Chlamydia muridarum (Cm) lung infection in mice. Methods A murine model of pneumonia induced by intranasal inoculation of Cm was used for this study. Anti-mouse IFN-γ McAbs were used to neutralize endogenous IFN-γfollowing Cm lung infection. Control group received the same dose of isotype antibody (IgG2a). Mice were sacrificed at day 7 postinfection. Chlamydial growth in the lung was assessed by immunoenzyme technique.IL-17 and IL-23 mRNA expression in the lung was assayed by RT-PCR and the proliferation of IL-17 + CD4 +T cells in the spleen was assayed by intracellular cytokine staining. Results IFN-γ-neutralized mice exhibited serious disease course, include greater body weight loss, higher organism growth and much more severe pathological changes in the lung compared with control mice. The mRNA expression of IL-17 and IL-23 in the lung and the proliferation of IL-17 + CD4 + T cells in the spleen significantly decreased in the IL-17- neutralized mice. Conclusion IFN-γ was protective in Cm lung infection through up-regulating the antigen specific Th17 responses.     

北京市性传播HIV-1感染者流行毒株gag基因序列测定和亚型分析

目的 了解北京市性传播HIV-1感染者流行毒株亚型特点和流行规律.方法 随机采集北京市2008年新确证性传播HIV感染者的抗凝全血标本100份,分离血浆,提取病毒RNA,用套式聚合酶链反应扩增病毒gag基因,并进行序列测定和亚型分析.结果 系统进化分析确定北京市性传播HIV-1感染者流行毒株存在8个亚型或流行重组型,分别为B亚型22份,B'亚型8份,C亚型1份,CRF01_AE 38份,CRF02_AG 2份,CRF07 BC 9份,CRF08_BC 3份,疑似C/CRF01_AE重组型1份.结论 CRF01_AE和B亚型分别占45.2%和26.2%,为性传播感染者主要的亚型,应该加强我市HIV-1亚型流行情况的监测.

Abstract：

Objective To investigate the subtype distribution and sequence characteristics of HIV-1 strains prevalent among sexual infectors in Beijing. Methods We collected the blood samples from 100HIV sexual infectors in Beijing during 2008 and separated plasma specimens. RNA was extracted from the plasma and the gag gene was amplified by RT-PCR and nest-PCR. The PCR products were sequenced directly and phylogenetic analyses of gag gene was performed using the MEGA4 software. Results Among 100 HIV-1 plasma samples,84 gag gene fragments were amplified and analyzed. Eight HIV subtypes including B(22 strains), B'(8 strains),C( 1 strain) ,CRF01_AE (38 strains) ,CRF02_AG (2 strains) ,CRF07_BC(9 strains) ,CRF08_BC(3 strains) and C/CRF01_AE recombinant like strain( 1 strain) were identified circulating in Beijing. Conclusion CRF01 _AE and subtype B were predominant in Beijing account for 45.2% and 26.2% and the surveillance of HIV gene variation should be paid more attention.     

厄罗替尼联合塞来昔布阻断EGFR和COX-2抑制肺癌A549细胞增殖

目的探讨厄罗替尼联合塞来昔布对肺腺癌A549细胞系凋亡、表皮生长因子受体(EGFR)和环氧合酶-2(COX-2)表达的影响。方法厄罗替尼、塞来昔布单独或联合干预细胞48 h后,倒置相差显微镜观察细胞形态;四甲基偶氮唑盐(MTT)法测定细胞抑制率;Hoechst33258法和TUNEL法检测细胞凋亡和流式细胞术检测细胞周期;免疫荧光检测EGFR和COX-2蛋白表达。结果厄罗替尼联合塞来昔布组相比单药组A549细胞明显出现大量颗粒和空泡,细胞变圆开始脱落;二者联合作用时抑制作用更强(P<0.05),厄罗替尼与塞来昔布均能诱导细胞凋亡,联合作用后细胞凋亡率更高(P<0.05),并使细胞发生明显的G1期阻滞(P<0.05),进一步下调了EGFR和COX-2蛋白的表达(P<0.05)。结论厄罗替尼与塞来昔布联合应用可协同介导细胞凋亡,阻滞细胞周期于G0/G1期及阻滞EGFR和COX-2信号途径。     

微生物药物研究进展与发展趋势

微生物药物作为广泛使用的临床药物具有重要的地位,尤其是在抗感染、抗肿瘤、降血脂和抗器官移植排异方面具有不可替代的作用。     

结节病肉芽肿细胞内空气细颗粒物元素组成及来源分析

目的 分析结节病肉芽肿细胞(吞噬细胞、类上皮细胞、多核巨细胞)内空气细颗粒物(PM2.5)的元素组成及来源,探讨结节病与PM2.5的相关性.方法 收集50例结节病病变组织、10例非结节病成人尸检肺组织、18例PM2.5支气管灌注染毒大鼠肺组织(有肉芽肿病灶)石蜡包埋标本,采集大气中PM2.5,分别行HE染色、沃森-斯塔理(Warthin-Starry,WS)银染色,应用共聚焦显微镜拉曼光谱和透射电镜-能谱对上述部分病例标本肉芽肿细胞和尘细胞内的PM2.5及大气PM2.5的成分进行分析,用X线荧光分析技术对所采集大气PM2.5的主要元素成分进行分析.结果 结节病病变组织、非结节病成人尸检肺组织、PM2.5支气管灌注染毒大鼠肺组织及大气中PM2.5共4组标本中PM2.5的拉曼光谱和元素组成非常相似,均以碳质成分为主要特征.结论 为结节病肉芽肿细胞中的PM2.5来源于大气PM2.5提供了进一步的依据,从而不能完全除外结节病患者可能是对PM2.5易感的个体的可能性.

Abstract：

Objective To explore the source of the fine particulate matter (PM2.5) in the sarcoidosis granulomatous cell and the relationship between the sarcoidosis and the PM2.5 in the atmosphere.Methods Paraffin-embedded tissues of 50 cases of human sarcoidosis biopsy samples, 10 cases of nonsarcoidosis autopsy lung samples, 18 cases of lung tissues (with granulomatous lesions) of rats exposed to PM2.5 by bronchial infusion, and the free PM2.5 sample in the atmosphere were collected. The characteristics of tissues above mentioned were observed under the light microscopy, which stained by HE staining and Warthin-Starry silver staining. The characteristics of the PM2.5 in the four groups were analyzed using confocal Raman microscopy. The component of the PM2.5 in the sarcoidosis granuloma was analyzed using transmission electron microscope-energy dispersive X-ray detector (TEM-EDX), and the component of the PM2.5 in the atmosphere was analyzed with X-ray fluorescence separately. Results The PM2.5 in the four groups have the similar Raman spectrum, they share the feature of carbonaceous composition, the element component of PM2.5 in the human sarcoidosis was the same as PM2.5 in the atmosphere. Conclusion The study provided the further evidence that the PM2.5 in the sarcoidosis lesion was from PM2.5 in the atmosphere,and it should be not excepted that sarcoidosis may be a sensitive individual reaction to the PM2.5 inhaled from the atmosphere.     

足弓差异对动静态足踝功能的影响

目的 通过运动生物力学手段从动、静态两个方面评价不同足型受试者足踝功能的差异,为足踝运动研究提供理论支持和参考依据.方法 对65名受试者以足弓指数区分成扁平足、低弓足和正常足3组,采用单因素方差分析3组受试者静、动态足踝功能指标的差异.结果 在静态足踝功能方面,正常足踝关节适应性(malleolar valgus fl...     

抗血管紧张素Ⅱ单克隆抗体制备及初步鉴定

目的 运用杂交瘤技术制备血管紧张素Ⅱ单克隆抗体,并对其进行初步鉴定.方法 制备血管紧张素Ⅱ免疫原免疫BALB/c小鼠,将小鼠脾细胞与SP2/0骨髓瘤细胞融合,通过筛选克隆后获得细胞株并制备血管紧张素Ⅱ单克隆抗体,对抗体的亚型、效价、亲和常数、交叉反应率进行测定并评估其用于化学发光免疫分析的性能.结果 共制备出6株单克隆...     

肾移植术后感染碳青霉烯酶耐药肺炎克雷伯菌的研究

感染是肾移植患者术后最普遍的并发症和导致其死亡的最大元凶,它主要包括细菌感染、真菌感染和病毒感染.目前,细菌感染在肾移植术后感染中占比57.8％～90.5％,而细菌感染又分为革兰阳性菌和革兰阴性菌感染.在革兰阴性菌感染中,肾移植术后感染碳青霉烯酶耐药肺炎克雷伯菌(CRKP)高达26％,且有研究证实其病死率和移植物的损失...     

重组腺病毒载体介导低氧诱导因子基因转染促进SD大鼠骨组织工程血管化的实验研究

目的评价重组腺病毒介导的低氧诱导因子基因导入是否具有促进SD大鼠骨组织工程的血管化的作用。方法通过重组低氧诱导因子腺病毒载体转染SD大鼠的骨髓基质细胞,然后将含有目的基因种子细胞与骨组织工程的支架材料藻酸钙复合成可注射性组织工程骨植入裸鼠背部皮下,应用Masson染色和SP免疫组化法观察异位成骨能力,检测构建组织的微血管密度计数(MVD)。结果动物实验显示,实验组新骨形成和新生血管形成良好,实验组的微血管化密度显著地高于对照组。结论低氧诱导因子基因导入有利于组织工程骨的新骨形成和再血管化。     

人软骨糖蛋白-39对CIA大鼠淋巴细胞外增殖作用的研究

目的 观察人软骨糖蛋白-39( HCgp39)对胶原诱导型关节炎(CIA)大鼠淋巴细胞激活的影响,探讨其在类风湿关节炎(RA)发病中的作用.方法 建立CIA大鼠模型,分别在建模1、2、3、4、5、6、7、8周后,分离、培养大鼠脾淋巴细胞,CCK-8法检测HCgp39对淋巴细胞增殖的影响,ELISA法检测血浆中抗HCgp39抗体及COMP的分泌水平,分析指标之间相关性.结果 建模2周后,HCgp39抗原特异性T细胞与对照组比较出现明显增殖反应(P均＜0.01),与建模时间、抗HCgp39抗体水平显著正相关,与血管翳和滑膜炎症评分显著负相关.各组抗HCgp39抗体水平和COMP水平较对照组显著增高(P均＜0.01),且抗HCgp39抗体水平与建模时间及COMP呈显著正相关.结论 HCgp39可刺激CIA大鼠脾淋巴细胞的体外异常增殖,初步提示HCgp39抗原短肽在CIA早期及后续的发病过程中可能起着一定作用.