腺病毒介导的Hes1基因抑制肝细胞癌细胞的增殖与迁移CSCD

目的探讨Hes1基因对肝细胞癌细胞系Hep1-6细胞增殖、迁移与侵袭的影响。方法通过重组腺病毒载体介导Hes1基因在Hep1-6细胞系中过表达,随后测定细胞克隆形成率、增殖速率及体外迁移与侵袭能力的改变。结果Hep1-6细胞分别感染Ad-Hes1和阴性对照Ad-GFP后,感染Ad-Hes1的细胞系克隆形成数显著少于对照组(P<0.001);感染病毒6天后,CCK-8检测感染Ad-Hes1的细胞系在OD450 nm的吸光度值显著低于对照组(P<0.01);感染Ad-Hes1的细胞系24 h和48 h的划痕愈合率显著低于对照组(P<0.001);感染Ad-Hes1的细胞系在Transwell小室培养48 h后迁移进入Transwell下室的细胞数量显著低于对照组(P<0.001);感染Ad-Hes1的细胞系在铺有Matrigel基质胶的Transwell小室培养48 h后侵袭进入Transwell下室的细胞数量显著低于对照组(P<0.01)。结论Hes1有抑制Hep1-6细胞增殖、迁移与侵袭的作用。     

Vaccination inhibits the human adenoviral transduction in a mouse keratoconjunctivitis model

Adenovirus infections are a major cause of epidemic keratoconjunctivitis (EKC), which can lead to corneal subepithelial infiltrates and multifocal corneal opacity. In the current study, we investigated the use of an E1/E3-deleted adenovirus serotype 5 (Ad5) vector as a vaccine administered intramuscularly (IM) or intranasally (IN) against subsequent challenges with a luciferase-expressing Ad5 (Ad5-Luci) vector via eyedrop. We evaluated the adaptive immune response to Ad5 vector vaccination and confirmed a robust polyfunctional CD8 T cell response in splenic cells. Neutralizing Ad5 antibodies were also measured in the sera of vaccinated mice as well as Ad5 antibody in the eye wash solutions. Upon challenge with Ad5-Luci vector 8 weeks post the primary immunization, transduction was significantly reduced by > 70% in the vaccinated mice, which was slightly better in IM- vs. that in IN-vaccinated animals. Resistance to subsequent challenge was observed 10 months post primary IM vaccination, with sustained reduction up to 60% in the Ad5-Luci vector transduction. Passive immunization of naive mice with antisera from IM to vaccinated mice subsequently challenged with the Ad5-Luci vector resulted in approximately 40% loss in transduction efficiency. Furthermore, the mice that received IM immunization with or without CD8 T cell depletion showed > 40% and 70% reductions, respectively, in Ad8 genomic copies after Ad8 topical challenge. We conclude that Ad-vector vaccination successfully induced an adaptive immune response that prevented subsequent Ad transduction in the cornea and conjunctiva-associated tissues in a mouse model of adenovirus keratoconjunctivitis, and that both cellular and humoral immunity play an important role in preventing Ad transduction.     

Severe adenovirus pneumonia with hemophagocytic syndrome and respiratory failure

We report the case of an 18-month-old infant with severe serotype 3 adenovirus pneumonia, exceptionally associated with hemophagocytic syndrome. Treatment included cidofovir and mechanical ventilation for 13 days. The child developed chronic respiratory insufficiency due to bronchiectasis and bronchiolitis obliterans.     

Differential removal of human pathogenic viruses from sewage by conventional and ozone treatments

Sewage contains a mixed ecosystem of diverse sets of microorganisms, including human pathogenic viruses. Little is known about how conventional as well as advanced treatments of sewage, such as ozonation, reduce the environmental spread of viruses. Analyses for viruses were therefore conducted for three weeks in influent, after conventional treatment, after additional ozonation, and after passing an open dam system at a full-scale treatment plant in Knivsta, Sweden. Viruses were concentrated by adsorption to a positively charged filter, from which they were eluted and pelleted by ultracentrifugation, with a recovery of about 10%. Ion Torrent sequencing was used to analyze influent, leading to the identification of at least 327 viral species, most of which belonged to 25 families with some having unclear classification. Real-time PCR was used to test for 21 human-related viruses in inlet, conventionally treated, and ozone-treated sewage and outlet waters. The viruses identified in influent and further analyzed were adenovirus, norovirus, sapovirus, parechovirus, hepatitis E virus, astrovirus, pecovirus, picobirnavirus, parvovirus, and gokushovirus. Conventional treatment reduced viral concentrations by one to four log10, with the exception of adenovirus and parvovirus, for which the removal was less efficient. Ozone treatment led to a further reduction by one to two log10, but less for adenovirus. This study showed that the amount of all viruses was reduced by conventional sewage treatment. Further ozonation reduced the amounts of several viruses to undetectable levels, indicating that this is a promising technique for reducing the transmission of many pathogenic human viruses.     

携带可调控人胰岛素基因的腺病毒载体的构建和鉴定

目的:构建携带葡萄糖依赖性促胰岛素多肽(GIP)启动子控制下的人胰岛素基因的腺病毒载体。方法:将GIP- hIns基因自pCDNA3-GIP-hIns质粒中酶切下来,克隆至切除CMV启动子的pCA13-△CMV质粒中,形成转移质粒 pCA13-GIP-hIns,然后与质粒pBHGE3共转染至293细胞株,在其中同源重组形成腺病毒颗粒。采用PCR方法对重组体进行鉴定,同时测定病毒滴度。体外转染STC-1细胞,并采用RT-PCR检测感染腺病毒的细胞内有无hIns mRNA 的转录。结果:由pCA13-GIP-hIns和pBHGD共转染至293细胞后,可得到阳性重组体Ad.GIP-hIns,经PCR检测表明已含有GIP-hIns基因。纯化所得腺病毒滴度约为1×1011 pfu／ml。RT—PCR证实在感染重组体腺病毒Ad．GIP— hIns的细胞中有相应mRNA的转录。结论:成功构建了携带GIP启动子控制下的人胰岛素基因的腺病毒载体,为进一步胰岛素基因治疗糖尿病的实验研究奠定了基础。     

腺病毒介导BMP-2和EGFP基因转染兔骨髓基质干细胞及种植脱钙骨的体外观察

目的用腺病毒载体介导人骨形态发生蛋白-2及EGFP基因转染兔骨髓基质干细胞(rBMSC),种植DBM(脱钙骨)支架体外构建组织工程骨。方法兔髓基质干细胞(rBMSC)的分离、培养;流式细胞仪检测细胞表面标记;转染后,荧光显微镜观察细胞最适感染复数(MOI)及蛋白印迹检测外源基因的表达情况;采用Urist提供的方法制备脱钙骨(DBM),用细胞计量法测定BMSCs与DBM复合培养的黏附率。然后将转染后细胞接种到DBM支架上,用荧光显微镜观察细胞是否成功粘附于支架材料上,扫描电镜观察细胞贴附、生长状况。结果 BMSCs细胞表型鉴定:CD44表达阳性,CD45表达阴性;转染后,蛋白印迹试验检测到BMP-2表达增高;骨髓间充质干细胞与脱钙骨基质的平均粘附率为(72.74±1.99)%;扫描电镜见转染细胞生长良好,伸出丝状突起,相互连接。结论成功培养及鉴定兔BMSCs,Ad-BMP-2/EGFP可高效转染兔BMSCs,转染后的细胞种植于DBM支架材料后生长状况良好,组织工程骨构建成功。     

甘肃省康县儿童腺病毒7型流行特征与病原学分析

目的 探讨甘肃省陇南市康县儿童腺病毒7型的流行病学及病原学特征。方法 采用统一的流行病学个案调查表对病例进行调查,采集病例咽拭子样本118份,采用实时荧光聚合酶链反应（PCR）方法对流感病毒（influenza virus, Flu）、呼吸道合胞病毒（respiratory syncytial virus, RSV）、呼吸道腺病毒（human adenovirus, HAdV）等12种病原进行初筛检测。对HAdV核酸初筛阳性样本进行病毒分离,并对分离到的病毒株进行Hexon基因片段测序,核酸序列采用ClustalⅩ和Mega 6.0软件进行分析。结果 2014年12月20日至2015年2月2日共报告118例感染病例,均为儿童,年龄最小的仅2个月,最大的11岁,分布在康县21个乡镇中的17个乡镇,1岁27例,1～岁37例,2～岁40例;5岁14例,其中男性67人,女性51人,男女性别比为1.31:1。临床特征以发热、咳嗽、咽痛为主,部分病例伴扁桃体发炎、腹泻等症状。实验室确诊为HAdV感染的有33例,分布在13个乡镇。118例病例咽拭子经实时荧光PCR检测,HAdV阳性33例,流感病毒H3N2阳性7例,RSV阳性6例,HAdV和RSV混合感染2例。HAdV阳性标本用Hep-2细胞分离到病毒18株。中国疾病预防控制中心病毒病预防控制所复核HAdV717株,HAdV31株,毒株测序结果表明,HAdV7毒株同源性高达100%,所有毒株位于同一分支上。结论 该起儿童呼吸道感染疫情的主要病原是HAdV7;疫情初期为H3N2流感病毒感染,后期RSV病毒感染病例使疫情持续时间延长;当地的恶劣气候,医院门诊对发热患者未按要求进行预检分诊,输液大厅、儿科病房等通风条件差,病例拥挤是本次疫情扩散的主要原因。     

Antiviral T Cells for Adenovirus in the Pretransplant Period: A Bridge Therapy for Severe Combined Immunodeficiency

Viral infections can be life threatening in patients with severe combined immunodeficiency (SCID) and other forms of profound primary immunodeficiency disorders both before and after hematopoietic stem cell transplantation (HSCT). Adoptive immunotherapy with virus-specific T cells (VSTs) has been utilized in many patients in the setting of HSCT, but has very rarely been attempted for treatment of viral infections before HSCT. Here we describe the use of VSTs in an infant with RAG1 SCID who had developed disseminated adenovirus which failed to improve on cidofovir. Adenovirus cleared following 2 doses of VSTs and marrow infusion from a matched unrelated donor, without incidence of graft versus host disease. T cell receptor-b sequencing demonstrated expansion of adenovirus-specific T cell fraction of the VSTs, suggesting that infusion facilitated viral clearance. This report suggests that VSTs are likely safe in the pre-HSCT period, and may be a useful bridge therapy for infants with SCID and persistent viral infections.     

腺病毒介导的白介素-24转移对脂多糖诱导的大鼠肾小球系膜细胞凋亡和周期调节蛋白p21、p27及CyclinE的影响

目的 探讨腺病毒介导的IL-24转移对脂多糖（LPS）诱导的大鼠肾小球系膜细胞（GMCs）和细胞周期调节蛋白p21、p27及CyclinE的影响。方法 采用10%FBS/DMEM培养293细胞,扩增腺病毒载体, GMCs培养4~6代细胞后用于分析。①观察IL-24对LPS诱导的GMCs凋亡影响：分为对照组、Ad.IL-24组、LPS组和LPS+ Ad.IL-24组,其中对照组和LPS组GMCs不转染携带IL-24腺病毒（Ad.IL-24）,Ad.IL-24组和LPS+Ad.IL-24组以Ad.IL-24转染GMCs,LPS组和LPS+Ad.IL-24组加LPS培养,以流式细胞术检测培养后24和48 h的GMCs凋亡率;②考察IL-24对GMCs周期蛋白影响：对照组为5%FBS/DMEM培养GMCs,Ad-GFP组采用携带绿色荧光蛋白的对照载体（Ad.GFP）转染GMCs,Ad.IL-24+LPS组以Ad.IL-24转染GMCs,采用Western-blot检测p21、p27及CyclinE表达。结果 ①GMCs在培养后24和48 h细胞凋亡率：对照组分别为(0.86±0.15)%和(0.98±0.4)%;IL-24组分别为(1.02±0.22)%和(1.43±0.31)%;LPS组分别为(2.19±0.81)%和(2.49±0.12)%,LPS+Ad.IL-24组分别为(18.01±1.17)%、(26.82±5.01)%;2个观察时间点细胞凋亡率对照组与IL-24组差异无统计学意义, LPS组显著高于对照组（P＜0.05）,LPS+ Ad.IL-24组细胞凋亡率最高（P＜0.05）。②Ad-GFP组p21、p27表达显著低于对照组（P<0.05）,CyclinE表达显著高于对照组（P<0.05）;Ad.IL-24+LPS组p21、p27表达较Ad-GFP组显著上调（P<0.05）,CyclinE表达较Ad-GFP组下调。结论 IL-24腺病毒载体对正常GMCs无影响,但可使LPS诱导增生的GMCs凋亡增加,其可能机制是上调关键细胞周期负调控蛋白p21、p27及下调CyclinE。     

2012年江西省儿童急性出血性结膜炎病原学特征分析

目的：了解2012年江西省儿童急性出血性结膜炎(AHC)病原学特征,为其防治提供科学依据。方法采集2012年江西省急性出血性结膜炎患儿44例结膜拭子标本,并运用PCR和RT-PCR方法对这44份结膜拭子标本同时进行肠道病毒70型、柯萨奇病毒24型变异株和腺病毒三种病毒检测。结果2012年江西省儿童流行性出血性结膜炎流行高峰在5-7月份;PCR和RT-PCR检测结果为腺病毒阳性31份。结论2012年江西省儿童急性出血性结膜炎病原体主要为腺病毒。