肺炎衣原体单克隆抗体的研制和应用

目的:以杂交瘤技术制备抗肺炎衣原体(Cpn)单克隆抗体,用于衣原体感染的诊断及相关疾病的研究。方法:以进口Cpn抗原免疫BALB/c小鼠,将免疫小鼠的脾脏细胞与SP2/0细胞融合,用间接ELISA法筛选抗体阳性杂交瘤细胞。收集接种过杂交瘤细胞的小鼠腹水,分别用ELISA法检测抗体效价、用免疫琼脂扩散试验鉴定单抗的类别、用微量荧光免疫试验(MIF)检测单抗的种属特异性。用克隆表达的主要外膜蛋白(MOMP)通过Dot-ELISA法分析单抗的特异性。通过建立直接免疫荧光法(DIF)检测病人和正常人外周血单核细胞(PBMC)标本,并进行统计处理。结果:小鼠脾脏细胞与SP2/0细胞的融合率为61.46%(236/384),最终获得4株稳定分泌Cpn单抗的细胞株。用ELISA法检测小鼠腹水,效价高者可达1∶100000。免疫琼脂扩散试验鉴定为IgG类单抗,扩散效价达1∶128。自制单抗能与重组MOMP发生结合反应,表明其为抗CpnMOMP抗体。自制单抗与进口单抗类似,即与鹦鹉热衣原体(Cps)出现一定程度的交叉反应,而与沙眼衣原体(Ct)则无交叉反应。对240份PBMC标本用自制单抗和进口单抗同时检测Cpn抗原,2种单抗检测均阳性的共86份,经SPSS软件分析两者具有较好的一致性。DIF检测显示,心血管疾病和呼吸道疾病Cpn抗原阳性检出率分别为69.34%(95/137)和72.06%(49/68),与正常人标本Cpn抗原阳性率相比,均具有显著性差异。结论:获得IgG类抗CpnMOMP单抗,自制Cpn单抗的特异性和敏感性均与进口单抗具有较好的一致性。PBMCCpn抗原检测的统计分析证实,对于动脉粥样硬化等某些疾病的发生和发展,Cpn感染可能是重要的原因之一,但其中的因果关系还有待深入研究。     

肺炎衣原体感染与急性心肌梗死关系的试验研究及初探

目的检测血清肺炎衣原体(TWAR)和白细胞介素-6 (IL-6)对急性心肌梗死(AMI)的诊断价值及血清脂质谱的变化,以期了解我国AMI患者TWAR的感染状况以及相关因子变化的临床意义.方法采用间接显微免疫荧光法检测53例急性心肌梗死病人和50例健康体验者血清肺炎衣原体IgG和IgM滴度,用ELISA法分别检测其血清白细胞介素-6(IL-6)的含量,同时检测两组血清脂质谱的含量.结果急性心肌梗死组肺炎衣原体既往感染率(73.6%)明显高于对照组(14%)(P ＜0.01),两组肺炎衣原体急性感染率差异无显著性(P＞0.05);两组血清中IL-6 含量超过正常上限值的阳性率差异有显著性,即对照组明显低于急性心肌梗死组(P＜0.0 1).发现急性心肌梗死组肺炎衣原体感染阳性者,其危险的血清脂质谱较对照组有明显的增加.结论肺炎衣原体感染与冠心病和急性心肌梗死的发生、疾病发展过程有密切关系 .     

应用斑点试验检测劳教所女犯人衣原体抗体

对劳教所性紊乱女犯人检侧衣原休优体。用斑点法检查的阳性检出率为5.70%,间接血凝法为4.88%。     

用Hela229细胞培养法研究呼吸道肺炎衣原体感染

本文用Ｈｅｌａ２２９细胞培养与单克隆抗体免疫荧光法对９４０例咽拭子及２２４例纤支镜取材标本进行肺炎衣原体分离鉴定。结果正常组、上呼吸道感染组、下呼吸道感染组、肺部肿瘤组的咽拭子标本分离率分别为０％（０／２４８）,２．１３％（１０／４６８）,２．１％（３／１４６）,１．２８％（１／７８）。上呼吸道感染组和下呼吸道感染组的分离率均高于正常组和肺部肿瘤组。前二组与正常组的差异有显著性意义（Ｐ＜０．０５）,与肿瘤组的差异无显著性意义（Ｐ＞０．０５）。下呼吸道感染组、肺部肿瘤组的纤支镜取材分离率分别为１０．９６％（     

PCR-微孔板核酸杂交技术检测肺炎衣原体研究

建立一种新的PCRELISA技术模式,简便、特异、敏感地检测肺炎衣原体,为肺炎衣原体的检测提供一种有效的新方法。采用链霉亲和素包被于聚乙烯微孔板,生物素标记的引物扩增目的DNA片段与荧光素标记的探针在微孔板内进行分子杂交,抗荧光素标记的辣根过氧化物酶可以与之结合,再加入底物即可产生颜色反应,通过测定其吸光度来进行结果判断。新建立的PCRELISA方法与其它相关的六种病原体无交叉反应,临床标本检测检出率高,呼吸道感染者标本42份检出率达2195%,肺炎患者标本465份检出率为4215%,比套式PCR方法及其它检测方法的检出率都高。应用新建立的PCRELISA方法检测肺炎衣原体特异、敏感,结果客观、稳定、可靠,对肺炎衣原体引起的疾病的诊断有十分重要的意义。     

沙眼衣原体疫苗候选抗原研究进展

沙眼衣原体(CT)是引起感染性致盲的首要病因,也是引起性传播疾病的主要病原体。CT感染缺乏明显的临床症状,临床上容易被忽视而引起严重的疾病,故疫苗是预防CT生殖道感染经济有效的措施之一。综述了CT疫苗候选抗原的结构特点,免疫保护作用及其在预防CT感染性疾病的应用前景。     

肺炎嗜衣原体诊断方法的研究进展

肺炎嗜衣原体(Cpn)是20世纪80年代新发现的一种重要的病原体,它不仅可以引起急慢性呼吸道感染,而且可能通过直接或间接的机制参与冠心病的发生与发展,因而受到了人们越来越多的关注。而Cpn感染的诊断正是人们关注的焦点之一。近年来,Cpn感染的诊断技术有了很大的进展,由十分困难的分离培养法到血清学检测方法发展成为今天的分子生物学诊断技术。毫无疑问,诊断方法的进展在便利Cpn感染诊治的同时,也将为人们更好的了解Cpn奠定基础。本文就Cpn感染的检测方法的研究进展作综述如下。     

肺炎衣原体HEP—2培养分离及其抗体的MIF研究

肺炎衣原体是一种引起肺炎及呼吸道感染等的新型病原体。本研究采用ＨＥＰ－２培养从８例呼吸道感染者新鲜痰液中初步分离出肺炎衣原体。此外,采用微量免疫光试验（ＭＩＦ）对９６例呼吸道感染者与４８例健康献血员的血清学分析表明：８３．４％的患者肺炎衣原体ＩｇＧ抗体阳性,与对照组比较,统计学上有非常显著差异。提示这些患者呼吸道感染中,肺炎衣原体可能起较大作用。     

肺炎嗜衣原体分离与培养的研究进展

肺炎嗜衣原体是世界公认的对培养生长条件较苛刻的微生物之一,难以从原始标本中成功分离培养,传代也比较困难。致力于改善Cpn分离培养条件及传代方法的研究无论对临床诊断还是实验室研究都具有重要意义。     

Outer membrane complex proteins of Chlamydia pneumoniae

Abstract The protein composition of the outer membrane complex (OMC) of Chlamydia pneumoniae strain AR-39 was analyzed by metabolic labeling with [³⁵S]methionine and [³⁵S]cysteine. Cysteine-rich proteins with molecular masses of 98, 60 doublet, 39.5 (MOMP) and 15.5 kDa were found in the OMC of C. pneumoniae . The cysteine-rich proteins of the OMCs of the threee Chlamydia species showed specific reaction patterns by immunoassay and autoradiography to rabbit or turkey immune sera. Recognition of the MOMP and 60-kDa proteins of the three species was cross-reactive. However, the C. pneumoniae 98-kDa protein was recognized by anti- C. pneumoniae (AR-39) and anti- C. psittaci (TT3) immune sera. None of the immunee sera recognized the 12-kDa cysteine-rich complex.     

肺炎衣原体蛋白激酶Cpn0148的克隆表达和定位

目前认为肺炎衣原体(Chlamydia pneumonia, Cpn)除导致呼吸道疾病外, 也是与冠心病相关的重要病原体。作为一种细胞内寄生的病原菌, Cpn激活宿主细胞信号通路, 维护其在细胞内生长代谢, 并导致疾病。肺炎衣原体基因Cpn0148可编码真核细胞样的丝/苏氨酸蛋白激酶, 利用PCR技术扩增全长Cpn0148 ORF, 将其定向插入pGEX-6p原核表达载体, 在大肠杆菌XL-1blue中表达, 测序显示Cpn0148 ORF全长1860 bp, 编码619个氨基酸, 分子量大约70 kD,     

Detection of serum antibodies against Chlamydia pneumoniae by ELISA

Abstract Chlamydia pneumoniae causes pneumonia and other respiratory infections in children, adolescents and adults. We tried to evaluate the diagnostic value of detection of serum antibodies by ELISA for C. pneumoniae infections in Japanese children. Serum IgG, IgA and IgM antibodies to C. pneumoniae were determined by the microimmunofluorescence (MIF) test. Serum IgG and IgA antibodies were also determined by ELISA test kits. Results obtained by ELISA were compared with those obtained by MIF test. IgG antibody to C. pneumoniae was detected in 135 (39.5%) by ELISA and in 125 (36.5%) by MIF out of 342 sera from Japanese infants and children without respiratory infections (aged from 2 months old to 15 years old). IgA antibody to C. pneumoniae was detected in 129 (37.7%) by ELISA and in 117 (34.2%) by MIF out of 342 sera tested. Of 342 specimens 113 were IgG-positive by ELISA and MIF (sensitivity: 90.4%, specificity: 89.9%, r = 0.853). Of 342 sera 28 had IgG antibody titers of 1:256 and none had titers 1:512 or higher by MIF. Of 28 infants and children a total of nine were less than 4 years of age. On the other hand, of 342 specimens 99 were IgA-positive by ELISA and MIF (sensitivity: 84.6%, specificity: 86.7%, r = 0.769). Of 342 sera 16 had IgA antibody titers of 1:256 or higher by MIF. Of 16 infants and children, ten were less than 4 years of age. ELISA had excellent sensitivity and specificity relative to MIF test for detection of IgC and IgA antibodies to C. pneumoniae . It was suggested that C. pneumoniae infection in Japanese infants and children under 4 years of age was not infrequent.     

外周血单个核细胞中肺炎衣原体的分离、培养及连续传代

开发一种分离并增殖肺炎衣原体(Cpn)的简易方法极具意义。该方法先分离血液标本中的外周血单个核细胞(PBMC),用PEG使Cpn-Ag阳性的PBMC裂解释放出Cpn,然后与人喉表皮癌细胞(Hep-2)一起离心,继续培养Hep-2细胞,再将Hep-2细胞冻融破碎后,放入到新的Hep-2细胞中进行离心,以完成Cpn的1次传代,然后以同样的方法进行2-4次传代。分别用微量免疫荧光法(MIF)及PCR法检测Hep-2细胞中的Cpn-Ag和CpnDNA,并用FITC标记的属特异性衣原体脂多糖单克隆抗体检测实验分离以及进口菌株传代后的包涵体形成单位数量。结果显示MIF法检测Cpn感染后的Hep-2细胞,其胞内Cpn-Ag强阳性;MIF法检测1次传代及2次传代的Hep-2细胞,其胞内Cpn-Ag亦均强阳性,3次传代为阳性,而4次传代为阴性;PCR法检测2次传代后CpnDNA阳性。该简化方法可以实现PBMC中Cpn的分离,分离菌株传代4次后出现退化(优于进口菌株),但该方法仍可实现进一步的培养及传代。     

Characterisation of 20-kDa lectin-spermagglutinin from Arum maculatum that prevents Chlamydia pneumoniae infection of L-929 fibroblast cells

A novel lectin from the root of Arum maculatum was isolated by saline extraction and purified by cold ethanol precipitation and subsequent fractionation on Superose 6 column. The lectin named A. maculatum agglutinin is a non-glycosylated protein with 20-kDa molecular mass agglutinating human ejaculated spermatozoa, but not human erythrocytes. The agglutination was blocked in the presence of N-acetylneuraminic acid indicating that the lectin is sialoglycoprotein specific. Chlamydia pneumoniae strain AR-39 showed considerable potential to grow in murine L-929 fibroblast cells. Pretreatment of the cell monolayers with purified lectin reduced the entry and intracellular replication of C. pneumoniae. These results suggest that the isolated lectin prevents attachment by binding to a C. pneumoniae specific sialoglycoprotein receptor expressed on the surface of L-929 fibroblast cells.     

HBsAg Mab胶体金探针制备与鉴定的实验研究

目的：研制合格的乙肝表面抗原单克隆抗体（HashgMab）标记的胶体金探针。方法：采用柠檬酸三钠还原法制备15nm的胶体金;所制备的胶体金通过透射电镜和紫外分光计度计鉴定其大小和均匀度。通过CVAI曲线,确定胶体金标记HBsAgMab蛋白用量;采用斑点免疫吸附试验对探针进行鉴定。结果：制备的15nm胶体金颗粒均匀;紫外分光光度计400—700nm扫描结果最大吸收波长为518nm,峰宽较窄;纯化的HBsAgMab浓度为65mg／mL;在PH为8.2时,每毫升胶体金的蛋白最适保护量为32．5μg;采用斑点免疫吸附试验鉴定探针质量合格,可保存3个月。结论：制备的HBsAgMab胶体金探针质量合格,为进一步研究提供手段。     

Differential expression of Pmp10 in cell culture infected with Chlamydia pneumoniae CWL029

The complete genome of Chlamydia pneumoniae contains a total of 21 genes encoding polymorphic membrane proteins (Pmp). From this large Pmp family three genes, pmp8, pmp10 and pmp11, were cloned and antibodies against recombinant full-length Pmp proteins were produced. Indirect immunofluorescence microscopy of HEp-2 cells infected with C. pneumoniae CWL029 was performed with the Pmp antibodies in combination with a Chlamydia-specific anti-lipopolysaccharide (LPS) antibody. This double staining technique clearly showed that expression of Pmp10 was differential. Additional double staining with monoclonal antibodies to the surface of C. pneumoniae elementary bodies and the anti-LPS antibody resulted in identification of seven monoclonal antibodies that reacted identically to the Pmp10 antibody indicating that Pmp10 is an immunodominant protein. Finally, the molecular mechanism responsible for differential expression is suggested to be variation in the guanine residues in the polyG tract of pmp10.