副结核分枝杆菌MAP0862蛋白的表达及在间接ELISA中的初步应用

本研究的目的是探索副结核分枝杆菌特异性蛋白MAP0862在牛副结核病血清学诊断中的作用,建立牛副结核病特异性ELISA诊断方法。将通过原核表达获得的副结核特异性蛋白MAP0862纯化并定量后作为包被抗原,经过一系列条件优化后初步建立了牛副结核病间接ELISA诊断方法。使用牛副结核阳性血清、牛布病阳性血清、牛结核阳性血清、卡介苗免疫牛血清、牛大肠杆菌阳性血清以及健康阴性牛血清对该方法的验证表明其具有良好的特异性。使用该方法对300份临床血清进行检测,结果表明该方法与IDEXX副结核检测试剂盒的符合率为94.3%。基于副结核特异性蛋白质MAP0862建立的间接ELISA诊断方法能有效检测牛副结核病。     

牛结核分枝杆菌MPB70蛋白分泌性载体的构建与蛋白表达

为了研究牛结核病新型诊断抗原,试验根据GenBank中Mycobacterium bovis基因序列设计1对引物,将牛结核分枝杆菌MPB70基因构建到pET22b(+)原核表达载体上,将重组载体转到E.coliBL21(DE3)中,经IPTG诱导获得高效表达,并进行SDS-PAGE和Westen-blot分析。结果表明:MPB70蛋白以可溶形式在细胞周质中表达,有部分蛋白以包涵体形式在细胞质中表达,其分子质量约为30ku,蛋白表达量占菌体总蛋白的20%;重组MPB70蛋白可与牛分枝杆菌阳性血清发生特异性反应。说明重组MPB70蛋白能够作为诊断抗原。     

利用重组表位蛋白map0862-2154c检测牛副结核血清抗体胶体金免疫层析方法的建立（英文）

筛选牛副结核分枝杆菌的2个主要抗原map0862、map2154c中抗原指数高的抗原表位基因,将多表位基因序列合成,与原核表达载体pET28a(+)连接,构建重组质粒pET28a-map0862-2154c。重组质粒转化至大肠杆菌感受态细胞BL21(DE3)中诱导表达,以表达的重组表位蛋白为抗原建立检测牛副结核分枝杆菌抗体的胶体金免疫层析方法(GICA,map0862-2154c-GICA),同时对河北省部分牛场采集的242份副结核病奶牛血样进行血清抗体检测。结果表明,牛副结核分枝杆菌表位蛋白map0862-2154c成功表达,表达产物能与牛副结核分枝杆菌阳性血清反应。临床血清样本检测结果表明,其敏感性、特异性和符合率分别为91.86%(79/86),94.23%(147/156)和93.38%(226/242),该方法可用于牛副结核病的血清抗体检测。     

牛分枝杆菌重组蛋白TB27.4的表达、纯化及活性鉴定

为探索TB27.4蛋白在牛结核病鉴别诊断中的作用,本试验以牛分枝杆菌Vallee Ⅲ株基因组DNA为模板,PCR扩增tb27.4全长基因片段,将其定向克隆到原核表达载体pET-32a(+)中,构建重组质粒pET-TB27.4,优化原核表达条件,并用AKTA Purifier对蛋白的纯化条件进行优化。SDS-PAGE结果显示重组蛋白为可溶性表达,且大小与理论值相符,用牛分枝杆菌阳性血清进行Western blotting检测有特异性条带,且可特异性地刺激牛分枝杆菌感染牛外周血淋巴细胞释放大量IFN-γ。结果表明,重组蛋白TB27.4具有良好的B细胞活性和T细胞刺激活性,为进一步研究其在牛结核病诊断中的作用奠定了基础。     

副结核分枝杆菌MAP0862、MAP1345基因的串联表达及其在间接ELISA中的初步应用

为探索副结核特异性蛋白MAP0862与MAP1345在牛副结核病血清学诊断中的作用,将通过串联表达获得的融合蛋白MAP0862-1345纯化定量后包被酶标板,经过对反应条件的优化,初步建立了基于融合蛋白MAP0862-1345的间接ELISA诊断方法。使用建立的ELISA方法对牛副结核病阳性血清、牛结核病阳性血清、牛布病阳性血清、卡介苗免疫牛血清、健康牛血清检测的结果表明其具有较好的特异性;使用该方法与IDEXX副结核病抗体检测试剂盒共同对300份临床血清样本检测,总符合率为92.7%。     

结核分支杆菌Rv3117基因的克隆与原核表达

以结核分支杆菌H37Rv株染色体DNA为模板,应用Rv3117基因特异性引物对该基因进行PCR扩增,获得约800bp的DNA片段。将PCR纯化产物克隆至pMD-18T Vector中,构建出重组质粒pMD-18T-Rv3117。以EcoRⅠ和SamⅠ双酶切pMD-18T-Rv3117重组载体和pGEX-4T-1原核表达载体,并将纯化的Rv3117基因亚克隆至pGEX-4T-1中,构建出原核重组表达质粒pGEX-4T-1-Rv3117。将pGEX-4T-1-Rv3117重组质粒转化至感受态E.coli BL21中,经IPTG诱导和SDS-PAGE分析,可见约30ku目的蛋白带。Western blot分析结果显示,该蛋白能与抗结核分支杆菌阳性血清发生特异性反应。研究结果为结核病临床诊断抗原的筛选奠定了基础。     

副结核分枝杆菌map0862基因的克隆及其在大肠杆菌中的表达

为探索MAP0862蛋白在分枝杆菌感染鉴别诊断中的作用,研究构建了MAP0862的原核表达map0862-pET32a(+)质粒,并对其进行了诱导表达。以副结核分枝杆菌P10基因组DNA为模板,经PCR方法扩增副结核分枝杆菌map0862基因片段,将其克隆到原核表达载体pET32a(+)中。将重组子转化到大肠杆菌BL21(DE3),在E.coli中诱导表达带组氨酸标签的map0862-pET32a(+)的融合蛋白。结果显示,经IPTG诱导表达出约55 kD的融合蛋白,用副结核阳性血清进行Western blot检测,证明MAP0862重组蛋白具有良好的免疫原性。     

结核分支杆菌Mtb8.4真核、原核表达质粒的构建与表达

低分子质量蛋白抗原Mtb8.4是一种非常重要的结核分支杆菌抗原,为了研制结核病核酸疫苗和进行结核病的诊断,分别将其构建到原核和真核载体中进行表达。以结核分支杆菌标准菌株H37Rv基因组DNA为模板,PCR扩增目的基因Mtb8.4,扩增产物酶切后分别克隆到真核表达载体pJW4303和原核表达载体pGEX-4T-1中,构成重组真核表达载体pJW-Mtb8.4和重组原核表达载体pGEX-Mtb8.4,用限制性内切酶消化,PCR扩增及DNA序列分析等多种方法鉴定;并将正确构建的原核表达载体转入E.coliBL21(DE3)plysS中,IPTG诱导表达。结果表明,重组真核表达载体pJW-Mtb8.4和重组原核表达载体pGEX-Mtb8.4构建成功。构建的真核重组质粒pJW-Mtb8.4即可作为结核病DNA疫苗。原核表达载体pGEX-Mtb8.4在BL21(DE3)plysS中成功表达,将表达蛋白进行纯化,作为保护性结核分支杆菌抗原以便检测DNA疫苗的免疫效果。     

同时检测动物布鲁菌病和结核病胶体金抗体检测试纸条的研制

本研究分别以布鲁菌LPS和牛分枝杆菌MPB70蛋白作为检测抗原,建立了动物布鲁菌病和结核病双抗原夹心法胶体金抗体检测技术,并研制了同时检测动物布鲁菌病和结核病的快速抗体检测试纸条,用于动物布鲁菌病和结核病临床快速血清抗体检测。检测试纸条与其他病原无交叉反应,与牛、鹿口蹄疫血清、巴氏杆菌病血清、耶尔森氏菌病血清无交叉反应;敏感性高,临床采集的布鲁菌病和结核病阳性血清最大稀释倍数可以达到1:512;特异性好,准确率高。研制的检测试纸条与现有的检测方法具有较高符合率:与RBT检测布病结果阳性符合率为100%,阴性符合率为96%,总符合率为96%;与牛结核γ-干扰素ELISA检测结核病结果阳性符合率94%,阴性符合率为97%,总符合率为96%。试纸条检测卡在吉林省多个地区进行临床试验,具有快速、敏感、特异、操作简单、可以用于现场快速检测等优点,能够同时用于动物布鲁菌病和结核病的临床抗体检测。     

鹿流行性出血病病毒VP7基因的克隆及原核表达

根据已经扩增的鹿流行性出血病病毒(EHDV)VP7基因序列,设计一对扩增VP7基因特异性引物,用RT-PCR从血清I型EHDV(EHDV-1)总RNA中扩增VP7基因,并将其克隆到原核表达载体pBAD/Thio中,构建了重组原核表达质粒pBAD/Thio-EHDV VP7。将表达载体转入大肠埃希菌(E.coliLMG194),用L-阿拉伯糖诱导表达。SDS-PAGE和Western blot试验结果表明,EHDV VP7基因在LMG194中得到了表达,其表达产物可以与EHDV阳性血清特异性反应,说明该融和蛋白具有免疫学活性。     

Expression of MPB70 Protein and Identification the Immunogenicity of Deer Mycobacterium tuberculosis

In this study,the immunogenicity protein MPB70 gene was amplified from Mycobacterium tuberculosis genome DNA which separated from deer, and about 590 bp fragment was obtained. Then the fragment was cloned and constructed prokaryotic expression vector of pET-30a-MPB70, and the recombinant plasmid was put into E. coli BL21(DE3).Purified after IPTG induction, and analyzed by SDS-PAGE, a specificity protein band was observed at 20 ku. Using the deer serum positive of tuberculosis in Western blotting, the fusion protein could be combined with deer serum positive of tuberculosis antibody and arise specific immune response. The protein could be used as a specific antigen to test the deer tuberculosis. The study laid a foundation for further studying the deer tuberculosis appraisal method.     

Tuberculosis in domesticated red deer: Comparison of purified protein derivative and the specific protein MPB70 for in vitro diagnosis

The use of a Mycobacterium bovis-specific protein, mycobacterial protein bovis 70 (MPB70), was compared with complex, M bovis-derived purified protein derivative (bovine PPD), for its ability to improve the diagnostic precision of in vitro assays for tuberculosis in farmed deer. A combination of lymphocyte transformation and enzyme-linked immunosorbent assay (ELISA) was used to differentiate between specific M bovis reactivity and crossreactivity due to sensitisation with saprophytic mycobacteria such as Mycobacterium avium. In the lymphocyte transformation assay the response of mononuclear cells, from red deer, to MPB70 was found to be more specific, but less sensitive, as an indicator of infection by M bovis when compared with the complex antigen bovine PPD. When used in conjunction with bovine PPD alone, MPB70 was found to increase the specificity of the ELISA in diagnosing animals with disease.     

牛型分枝杆菌MPB70蛋白胶乳凝集方法的建立及应用

为了研究牛结核病新型诊断试剂，提高诊断的特异性和敏感性，我们用大肠杆菌工程菌表达了牛型分枝杆菌特异性抗原MPB70并提纯蛋白建立了牛结核病乳胶凝集试验（LAT）诊断方法。MPB70是一种牛型分枝杆菌特异性分泌而卡介苗BCG缺失的蛋白质，热稳定性好，用此蛋白建立的乳胶凝集方法具有良好的敏感性、特异性以及较长的保存期，检测70份临床奶牛血清，与皮内变态反应和间接血凝方法相比较分别具有71．4％和88．6％的符合率。该方法还可鉴别诊断自然感染和疫苗免疫接种。我们建立的牛型分枝杆菌MPB70蛋白乳胶凝集试验诊断方法将分子生物学手段和经典试验方法有机结合，为临床快速检测牛结核病血清特异性抗体水平提供了行之有效的方法。     

Evaluation of electrophoretic immunoblotting for Brucella ovis infection in deer using ram and deer serum

AIMS: Recently the first case of natural infection of deer with Brucella ovis was discovered. The aim of this study was to develop and evaluate an electrophoretic immunoblotting method for testing deer serum for specific B. ovis antibodies. METHODS: An existing immunoblotting method for sheep serum was altered by using a recombinant protein G-alkaline phosphatase conjugate and Tris-buffered saline containing 3% non-fat dry milk powder for the blocking step and the serum and conjugate dilutions. The method was evaluated using 106 sheep sera from B. ovis - negative, accredited flocks, 69 sera from chronically infected rams shedding B. ovis in their semen, 110 sera from a B. ovis-infected flock, 18 sera from stags from which B. ovis was isolated, and 48 sera from deer flocks free from B. ovis infections. The immunoblotting method was applied to another 85 deer sera. RESULTS: The sensitivity of the new immunoblotting method was 98.6% for sheep and 94.4% for deer, and the specificity 99.1% for sheep and 100% for deer. Sixty-nine out of 97 deer sera, originating from the property from which the first B. ovis deer case had been reported, tested positive or suspicious in the complement fixation test. Of these, 53 sera exhibited staining patterns in blots typical for B. ovis infections and also one serum which was negative in the CFT. Only six out of 1498 deer sera. from throughout New Zealand had positive or suspicious reactions in the B. ovis complement fixation test. Of these, one exhibited a staining pattern in the blot suggestive of a B. ovis infection, while four showed patterns of suspicious reactions. CONCLUSION: The new immunoblotting technique is useful as a confirmatory serological test method for B. ovis infections in deer.     

吉林省鹿结核病的流行病学调查

为掌握结核病在吉林省鹿群中的流行传播状况,从吉林省养鹿业富有代表性地区的18个鹿场随机采集血清样本1856份作为研究对象,利用结核杆菌Ag85-East6-mpt70抗原多联表达蛋白作为检测抗原,进行酶联免疫检测,调查吉林省鹿结核病流行情况,结果发现,吉林省地区鹿群中存在结核病病例,且各地区间阳性率差异显著或极显著（P<0.05或P<0.01）,防疫部门应加强防控,防止疫病扩散。     

塔里木马鹿结核病的诊治

2007年新疆某规模马鹿场部分马鹿发病,仔鹿多表现为消瘦、食欲下降,营养消耗性死亡;成年鹿多表现为咳嗽、喘气、体温升高、突然喘气死亡。通过病理解剖,细菌培养,接种动物等方法确诊该鹿场马鹿死亡原因是感染了牛型结核分枝杆菌,说明牛型结核分枝杆菌可以感染马鹿。     

Evidence for BTV-4 circulation in free-ranging red deer (Cervus elaphus) in Cabañeros National Park, Spain

Bluetongue (BT) is an infectious disease of wild and domestic ruminants caused by bluetongue virus (BTV). BTV-4 spread through southern Spain from 2004 to 2006, whereas a BTV-1 outbreak that started in southern Spain in 2007 is still ongoing. Vaccination and movement restriction regulations are applied to domestic ruminants to control BT, but the potential reservoir role of wild European ungulates has not been clarified so far. The aim of this study was to describe the epidemiology of BTV in the wild free-ranging red deer (Cervus elaphus) population of Caba?eros National Park (CNP) in central Spain during the BTV-4 and BTV-1 epizootics, assessing the potential role of this deer population as a BTV reservoir. Blood samples from 2885 (2542 adults, 208 calves and 135 undetermined) wild red deer were collected from 2005 to 2010 in CNP and surrounding hunting estates. All sera were tested for antibodies against the BTV VP7 protein by ELISA. Ninety-four of the ELISA-positive samples were analysed by serum neutralization to detect BTV-4 and BTV-1 specific antibodies, and 142 blood samples were analysed by RT-PCR for BTV RNA. A total of 371 (12.9%) out of the 2,885 deer (35/208 calves, 307/2,542 adults, and 29/135 undetermined) were positive for antibodies against BTV. Prevalence increased in adult deer from 2005-2006 to 2008-2009, declining thereafter. No positive samples for BTV-1 were found by serum neutralization, whereas 43 deer (38 adults, four calves and one undetermined) were positive for BTV-4 specific antibodies. No BTV RNA positive deer were found by RT-PCR. Antibody detection throughout the study period suggests a maintained circulation of BTV in red deer. However, the lack of BTV RNA detection suggests a minor transmission risk to livestock.     

Comparison of postmortem techniques for the detection of Mycobacterium bovis in white-tailed deer (Odocoileus virginianus).

A retrospective study of various diagnostic postmortem techniques used in a 4-year surveillance program for detection of Mycobacterium bovis infection in wild white-tailed deer (Odocoileus virginianus) was conducted. The tests evaluated were routine histopathology, acid-fast staining, detection of acid-fast bacilli in culture, and an M. tuberculosis group-specific genetic probe applied to pure cultures. Each of these techniques were compared with a reference or "gold standard" of mycobacterial culture and identification. Histopathology, the most rapid form of testing for M. bovis infection in white-tailed deer samples, had a sensitivity of 98% and a specificity of 87%, resulting in a positive predictive value of 94%. The detection of acid-fast bacilli by staining was less sensitive than histopathology (90%), but its higher specificity (97%) resulted in a positive predictive value of 99%. The detection of acid-fast bacilli on culture was both highly specific (93%) and sensitive (100%). The group-specific genetic probe had the highest sensitivity and specificity and produced results in complete agreement with those of mycobacterial culture, suggesting that this technique could be used as the new "gold standard" for this particular wildlife tuberculosis surveillance program.     

吉林省梅花鹿副结核病、结核病及布鲁菌病血清流行病学调查

采集吉林省具有代表性的4个地区的8个梅花鹿场（四平2个梅花鹿场、通化2个梅花鹿场、长春市2个梅花鹿场、辽源2个梅花鹿场）中630份血清样本作为研究对象,进行血清学（ELISA_方法）检测,了解吉林省梅花鹿副结核病、结核病及布鲁菌病感染现状。上述4个地区均存在梅花鹿副结核病,结核病及布鲁菌病发生和流行,其中副结核病的整体阳性率为18．73％、结核病的整体阳性率为19．21％、布鲁病的整体阳性率为28．42％。吉林省梅花鹿副结核病、结核病及布鲁菌病流行不容乐观,提示广大饲养者及相关部门应该高度重视梅花鹿副结核病的防治工作。     

Serodiagnostic comparison between two methods, ELISA and surface plasmon resonance for the detection of antibody titres of Mycoplasma hyopneumoniae

A protein chip based on surface plasmon resonance (SPR) was developed for measuring the Mycoplasma hyopneumoniae antibody titres using a recombinant 30-kDa fragment of P97 adhesin as an antigen. The diagnostic potential of this SPR assay, for detecting the antibody titres to the M. hyopneumoniae 30-kDa protein, was compared with that of conventional ELISA using 70 pig serum samples taken from six pig farms. The SPR assay was found to be highly specific and sensitive. Moreover, there was a strong positive correlation between the SPR and ELISA titres (n = 70, r = 0.898, P < 0.01). Therefore, this recombinant 30-kDa protein can be used as an antigen for serological studies, and the SPR, which is a label-free method, is expected to be a valuable and reproducible tool in the serodiagnosis of M. hyopneumoniae infection.