实时荧光PCR方法快速检测空肠弯曲菌方法的建立

目的建立实时荧光PCR快速检测空肠弯曲菌的方法。方法以空肠弯曲杆菌HipO基因的保守序列为模板设计特异性引物探针,建立一种能快速检测样本中空肠弯曲杆菌的实时荧光PCR方法;对方法的特异性和敏感性进行评价,并以正常人粪便为空白样本,添加一定量空肠弯曲菌标准株菌液进行检测,以对方法的检测效果进行初步评价。结果该实时荧光PCR方法只对空肠弯曲杆菌进行特异扩增,同种属的结肠弯曲菌及其他常见食源性病原菌均不能扩增;整个检测过程只需要80min,对空肠弯曲菌菌悬液可检测至5个细菌,对加标粪便样本可检测至10-100个细菌。结论本研究建立的实时荧光PCR检测空肠弯曲菌方法不仅能实现对空弯菌的快速检测,而且还为空弯菌的快速诊断及其引起的食源性疾病的监控溯源提供有意义的参考。     

格林-巴利综合征相关空肠弯曲菌flaA基因的克隆及序列特征

近年来研究发现，空肠弯曲菌感染与部分格林一巴利综合征（Guillain-Barre syndrome，GBS）发病密切相关。空肠弯曲菌引起GBS的发病机制非常复杂，由于GBS常发生于少数几种特殊血清型的空肠弯曲菌感染，提示这些空肠弯曲菌可能具有某种独特的毒力特征，而这种毒力特征与引起GBS有关。空肠弯曲菌的鞭毛是其一个重要的毒力因子，在空肠弯曲菌感染的致病机制中起重要作用。鞭毛微丝由两个高度同源的基因flaA和flaB编码，     

2010年广州某医疗中心儿童夏季细菌性腹泻的病原学调查

目的研究广州地区小儿夏季细菌性腹泻的病原菌分布。方法采集2010年5～7月广州市妇女儿童医疗中心珠江新城院区腹泻患儿的大便标本进行常规病原菌的分离培养,通过生化反应和血清凝集试验进行鉴定和分型,并使用金标法对空肠弯曲菌抗原进行检测。结果从110份标本中检出44株病原菌,检出率为40.0%。其中致病性大肠埃希菌17株,2岁以下患儿检出15株;空肠弯曲菌12株,2岁以下患儿检出10株;沙门菌6株;念珠菌纯生长6株;产气荚膜杆菌3株。结论广州地区夏季儿童细菌性腹泻的主要病原菌是致病性大肠埃希菌及空肠弯曲菌,两者的易感人群以2岁以下婴幼儿为主。     

空肠弯曲菌鞭毛蛋白FlaA的原核表达

空肠弯曲菌（CJ）为常见的人兽共患病原菌,实验表明,CJ的菌体蛋白和LPS抗原均在引起自身免疫反应的神经性疾患的发生过程中具有重要意义.CJ的鞭毛抗原亦有可能参与某些神经性疾患的病理作用导致机体损伤.     

2008-2010年江门市腹泻病原菌现状调查

目的了解江门市细菌性腹泻病原菌的种类和构成特点,为预防和临床治疗提供科学的参考依据。方法 2008年12月至2010年6月,采集监测点腹泻患者的粪便（或肛拭）,分离霍乱弧菌、志贺菌、沙门菌、出血大肠O157：H7、空肠弯曲菌、结肠耶尔森菌、副溶血性弧菌、变形杆菌等10种病原菌,采用传统分离培养法及BD PHOENZX SYSTEM全自动鉴定系统鉴定。结果 1260份标本共分离各类病原菌189株,检出率为15.00%,其中检出金黄色葡萄球菌61株,沙门菌52株,蜡样芽胞杆菌22株,变形杆菌24株,副溶血性弧菌24株,空肠弯曲菌2株,结肠耶尔森菌1株,志贺菌3株,霍乱、出血大肠O157：H7未检出。结论金黄色葡萄球菌、沙门菌是江门市细菌性腹泻的主要病原菌。     

格林—巴利综合征相关空肠弯曲菌脂多糖抗原初步分析

用格林－巴利综合征相关性空肠弯曲菌复制动物模型成功后的动物免疫血清对河北省格林－巴利综合征病人分离株空肠弯曲菌、动物来源株空肠弯曲菌及北京对照用人源株空肠弯曲菌及其脂多糖抗原性进行分析。结果显示，发生了典型的格林－巴利综合征样疾病的动物已产生了明显的抗格林－巴利综合征相关性空肠弯曲菌的免疫反应，其抗脂多糖抗体与当地其它来源株空肠弯曲菌有部分交叉反应，与北京分离株空肠弯曲菌无明显交叉反应。说明格林－巴利综合征相关性空肠弯曲菌脂多糖具有其独持的抗原性。支持某些特殊血清型的空肠弯曲菌参与格林－巴利综合征的致病过程。     

吉兰-巴雷综合征相关空肠弯曲菌WLAX基因序列分析

目的了解吉兰-巴雷综合征(GBS)相关空肠弯曲菌的WLAX基因序列特征,为进一步研究GBS相关空肠弯曲菌的分子致病机制打下基础。方法通过PCR方法对该基因进行扩增,将PCR产物克隆到质粒载体上,然后进行测序,将测序结果通过DNAstar软件进行比较和聚类分析。结果与非GBS相关空肠弯曲菌比较,GBS相关空肠弯曲菌的WLAX核苷酸序列发生变异的频率增大;菌株的核苷酸序列与全基因测序空肠弯曲菌NCTC11168比较存在差异;聚类关系反映了空肠弯曲菌具有一定的区域特征。结论GBS相关空肠弯曲菌中WLAX基因发生突变的概率明显增大,这些突变与GBS致病性的关系有待于进一步确定。     

motA基因在空肠弯曲菌致病性相关趋化和定植中的作用

目的 确定鞭毛马达蛋白(flagellar motor protein)MotA编码基因在空肠弯曲菌(Campylobacter jejuni)致病性相关趋化和定植中的作用.方法 采用PCR扩增motA基因以及用于motA基因敲除的Kan~r基因和plus-motA基因片段,目的扩增产物克隆后测序.根据同源重组原理,构建空肠弯曲菌NCTC11168株motA基因自杀质粒(pBlueskrit-Ⅱ-SK~(motA-kan))和motA基因敲除突变株(motA~-).采用半固体平板迁移试验、基于硬琼脂平板(hard agar plus,HAP)的脱氧胆酸钠(SDC)体外趋化试验、小鼠空肠定植试验,了解空肠弯曲菌motA~-突变株和野生株鞭毛动力、SDC趋化和BALB/c-ByJ小鼠空肠内定植能力差异性.结果 所克隆的空肠弯曲菌motA基因核苷酸和氨基酸序列与已报道的相应序列相似性为100%.PCR和测序及含抗生素培养基连续传代培养结果证实,自杀质粒和motA~-突变株构建成功.motA~-突变株在半固体琼脂平板上的菌斑直径、在HAP上对0.2moL/L SDC趋化聚集环直径、黏附于小鼠空肠黏膜表面以及空肠内容物中motA~-突变株数量均明显少于野生株(P<0.05).结论 本研究成功构建了空肠弯曲菌motA基因敲除突变株.motA基因是空肠弯曲菌鞭毛动力以及致病性相关趋化和定植的必需基因.     

深圳市肉类食品空肠弯曲菌的污染情况调查

目的了解我市常见肉类食品中空肠弯曲菌的污染状况,为控制和预防空肠弯曲菌食物中毒提供科学依据。方法在食品污监测点随机抽检肉类食品样品117份,用传统国标法和荧光PCR法进行检测。结果从117份肉类食品中检出4份空肠弯曲菌,阳性检出率为3.4%。结论深圳市肉类食品中存在空肠弯曲菌的污染,如果加工、销售不当,及监督不严,会对群众健康构成潜在威胁。     

格林-巴利综合征患者血清中空肠弯曲菌脂多糖抗体的检测

格林－巴利综合征患者血清中空肠弯曲菌脂多糖抗体的检测郭力刘瑞春王惠娟田文强李春岩格林－巴利综合征（ＧＢＳ）可引起急性迟缓性瘫痪，已有许多研究报导本病与前驱空肠弯曲菌（Ｃｊ）感染有密切关系。本文用酶联免疫吸附试验方法，检测了ＧＢＳ患者组和健康人组的血清...     

雷公藤甲素抗肿瘤血管新生的研究进展（英文）

雷公藤甲素(triptolide,TPL)是从中草药雷公藤中提取的一种有效活性物质,已被用来治疗多种疾病,包括系统性红斑狼疮,类风湿性关节炎,肾病综合征等,TPL甚至有很强的抑制肿瘤的活性。近些年的研究显示,TPL具有抗血管新生的能力,TPL不仅可以抑制肿瘤的增殖,诱导细胞的凋亡,还可以抑制肿瘤的转移,可以增加其它化疗药物的抗肿瘤活性。本综述将讨论TPL在抗肿瘤血管新生方面的研究进展,以及初步探讨其潜在的作用机制。     

Restoration of in vitro responses in platelets stored in plasma

Conventional platelet storage in a blood bank is up to 5 days at room temperature in plasma. We investigated the optimal medium for assessing the quality of stored platelets by comparing in vitro test responses after resuspension in autologous plasma prepared from platelet-rich plasma after 5 days of storage at room temperature, autologous plasma stored cell-free for 5 days at room temperature, or autologous plasma stored cell-free for 5 days at -20 degrees C. Five-day-old platelets were prepared from aliquots of the same unit and resuspended in I of the 3 plasma preparations. The platelet-plasma mixtures were monitored for changes in pH, mean platelet volume, hypotonic shock response, P-selection expression, and aggregation. There were statistically significant differences between platelets resuspended in original plasma and platelets resuspended in either plasma stored cell-free at room temperature or frozen, with regard to hypotonic shock response, agonist-induced aggregation, and P-selectin expression. Plasma stored with platelets for 5 days yielded inferior platelet function test responses when compared with plasma stored cell-free at room temperature or frozen. Therefore, for direct comparison of platelet responses following novel storage methods, the resuspending plasma should be stored under the same conditions as the control platelet unit.     

Changes in activity of neutral proteases in tissues of ground squirrels in the dynamics of hibernation

Total activities of neutral proteases in the cerebral, hepatic, and myocardial tissues of ground squirrel vary during hibernation: in autumn (before hibernation) activities of the enzymes in the brain and myocardium start increasing, while in the liver they do not change. A common feature for all tissues is minimum activity of active neutral proteases in the middle of hibernation month 1 bout, while the maximum activity is recorded before awakening. Translated from Byulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 146, No. 9, pp. 278–280, September, 2008     

Kinetics of decline of maternal measles virus-neutralizing antibodies in sera of infants in France in 2006

The optimal age for measles vaccination is an important health issue, since maternal antibodies may neutralize the vaccine antigen before a specific immune response develops, while delaying vaccination may increase the risk of complicated diseases in infants. However, measles vaccination impacts the duration of protection afforded by transplacental transfer of maternal antibodies: vaccination-induced maternal antibodies disappear faster than disease-induced antibodies. In order to maintain protection against measles in infants, it is important to monitor the dynamics of this phenomenon in vaccinated populations. To assess the current situation in France, a multicenter, prospective seroepidemiological study was conducted in seven French hospitals between October 2005 and January 2007. Maternal measles antibody concentrations from 348 infants 0 to 15 months old were measured using the plaque reduction neutralization assay. Geometric mean concentrations and the percentage of infants with maternal measles antibody concentrations above the protection threshold (≥120 mIU/ml) were assessed according to age. Results show that after more than 20 years of routine measles vaccination in France, maternal measles-neutralizing antibodies decrease dramatically in French infants by 6 months of age, from 1,740 mIU/ml for infants 0 to 1 month old to 223 mIU/ml for infants 5 to 6 months old, and that 90% of infants are not protected against measles after 6 months of age. Infant protection against measles could be optimized both by increasing herd immunity through an increased vaccine coverage and by lowering the age of routine vaccination from 12 to 9 months.