猪带绦虫TSO45W-4B-TSOL18融合基因在长双歧杆菌中的表达

目的 在成功构建猪带绦虫大肠杆菌-双歧杆菌穿梭表达质粒pGEX-TSO45W-4B-TSOL18的基础上,研究猪带绦虫TSO45W-4B-TSOL18融合基因在长双歧杆菌中的表达情况。方法 将猪带绦虫大肠杆菌-双歧杆菌穿梭表达质粒pGEX-TSO45W-4B-TSOL18电转化入长双歧杆菌, IPTG诱导表达,SDS-PAGE和Western blot分析表达情况。结果 酶切、PCR和测序证实,重组质粒pGEX-TSO45W-4B-TSOL18成功转入长双歧杆菌。SDS-PAGE显示,重组蛋白相对分子质量(M_r)约为55 kD,与预期结果相一致。Western blot显示,重组蛋白能被兔抗血清、囊虫病猪血清和囊虫病患者血清所识别。结论 猪带绦虫TSO45W-4B-TSOL18融合基因能够在长双歧杆菌中获得表达,表达的重组蛋白具有特异的抗原性。     

Comparative study of the intestinal parasitism profiles between communities across the 5 municipalities of the Barranquilla metropolitan area,Colombia

Objectives The aim of this study was to compare the rate of parasitism and intestinal parasitism profiles of children who live in relatively proximal communities across the 5 municipalities of the Barranquilla metropolitan area, Colombia.MethodsIn total, 986 fecal samples from children aged 1 to 10 were analyzed using a direct method (physiological saline and lugol) and the zinc sulfate flotation technique. A comparative analysis of the parasitism profiles between sampling locations (7 schools and 3 health centers providing growth and development services) was conducted using principal component analysis (PCA). The presence of Taenia solium antibodies was evaluated by the enzyme-linked immunosorbent assay method in 269 serum samples from the same group of children.ResultsThe overall prevalence of intestinal parasitism was 57.6% (range, 42.1%–77.6%) across the sampling areas. The prevalence of helminthiasis was between 4.1% and 23.7%, and that of intestinal protozoa was between 38.2% and 73.5%. PCA showed that the parasite profiles of each sampling location shared no common characteristics. A total of 3.0% of the serum samples were positive for T. solium antibodies.ConclusionThe intestinal parasitism profiles between relatively proximal sampling locations with similar geographic conditions were vastly different, indicating the need to study each small ecological niche on a localized scale to develop more cost-effective interventions for controlling intestinal parasitism.     

Evagination of Taenia solium cysticerci: a histologic and electron microscopy study

BACKGROUND: After a human being ingests a cysticercus, the larval stage of Taenia solium, the cysticercus gradually develops toward the adult parasite. In this paper, we describe the sequential progress of evagination of cysticerci. METHODS: Intact cysticerci were obtained from swine muscle, and incubated in bovine bile to stimulate evagination. Dissecting, light, and electron microscopy of whole parasites and histologic sections were used for photographic registers. RESULTS: The first event was the widening of the opening of the bladder wall for the scolex and neck to emerge. The two chambers that conform the cysticercus were identified. Histologic sections provided explanation for the conformation of the spiral canal.The scolex uncoils during evagination but does not turn inside out. CONCLUSIONS: The scolex and the neck comprise a different structure from the bladder wall, although they are contiguous.     

抗亚洲带绦虫药物对乳酸脱氢酶抑制作用

目的探讨抗亚洲带绦虫药物对于重组的亚洲带绦虫乳酸脱氢酶(Ta.LDH)酶促功能的影响。方法将不同浓度的吡喹酮、阿苯达唑和甲苯咪唑加入Ta.LDH所催化的丙酮酸还原成乳酸(正反应)以及乳酸氧化成丙酮酸(逆反应)的标准反应体系当中,测定烔?废汆堰?核苷酸(NADH)在A340处吸光度的变化值。采用SPSS 16.0软件进行分析,计算药物对酶活性的相对抑制率。结果与对照组比较,0.10 mmol/L吡喹酮对Ta.LDH催化正逆反应的相对抑制率分别为93.99%(P0.01)和94.67%(P0.01),0.10 mmol/L阿苯达唑分别为85.45%(P0.01)和73.81%(P0.01);0.15 mmol/L甲苯咪唑分别为92.2%(P0.01)和86.13%(P0.01)。结论Ta.LDH可能为吡喹酮、阿苯达唑和甲苯咪唑抗亚洲带绦虫药物作用的靶标分子。     

Cysticercosis of the Fourth Ventricle Causing Sudden Death: A Case Report and Review of the Literature

A 15 years old girl of African origin was admitted with a history of headaches and a generalised tonic seizure. Her clinical examination including fundoscopy was normal. She claimed she had been assaulted. Within a few hours of her admission she was found dead in her bed during the ward round. Cardiopulmonary resuscitation was unsuccessful. At post-mortem, the major organs showed no pathological changes and neck dissection showed no abnormality. Neuropathological examination after formalin fixation revealed a cystic lesion in the fourth ventricle, ependymitis and acute hydrocephalus. Histology showed parts of the parasite Taenia solium and the diagnosis was neurocysticercosis. This case highlights the need for forensic and general pathologists as well as forensic medical examiners and paediatricians to be aware of neurocysticercosis as a possible cause of sudden death in the presence of normal clinical findings and negative autopsy, especially in patients from Asian, African or South American countries. As cysticercosis is the commonest cause of seizures in the developing world, neurocysticercosis needs to be considered as a cause of sudden and unexpected death in any patient with a history of headaches and/or seizures. Tibor Hortobágyi and Ali Alhakim are first authors who contributed equally to this work.     

云南兰坪地区带绦虫mtCOXⅠ片段测定分析

目的对云南兰坪地区带绦虫种类进行鉴定。方法选取成虫样本,进行基因组抽提,扩增线粒体细胞色素C氧化酶Ⅰ（mtCOXⅠ）部分基因片段,序列测定后,用生物学软件DNAMAN进行同源性分析并构建系统发育树。结果LP1和LP4同源性达99．8％,LP1-4与BZ2—3的同源性均在95％以上,而与BZ1的同源性较远,低于88％。亚洲带绦虫与牛带绦虫较接近,远离猪带绦虫。结论云南兰坪地区带绦虫株与亚洲带绦虫标准株相似,同属于亚洲带绦虫。mtCOXⅠ片段可用于带绦虫分类鉴定。     

贵州两种牛带绦虫感染免疫抑制小鼠生化指标的动态观察

目的 观察贵州省两种牛带绦虫感染小鼠生化指标动态改变。方法 将鉴定确认的都匀亚洲带绦虫和从江牛带绦虫成熟孕节内虫卵分别经次氟酸钠孵化后经皮下注射、感染小鼠，同时用地塞米松（1mg／d）皮下注射对小鼠进行免疫抑制。在40、60、75d剖杀，取血检测肝功能、肾功能、心肌酶等指标。结果肝功能TP、ALB、ALT、ALT、ASP随着感染时间延长有明显变化，肾功能指标BUN、CREA、UA，心肌酶CK、LDH明显升高，且随着囊尾蚴寄生时间延长，各种生化指标呈倍数递增。结论都匀牛亚洲带绦虫与从江牛带绦虫感染小鼠随时间延长。肝功能、肾功能、心肌酶都有明显改变，引起生化指标明显改变。     

抗猪带绦虫六钩蚴兔血清的制备及重组质粒pcDNA3.1/TSO45-4B在小鼠骨骼肌的表达

目的:制备抗六钩蚴全虫可溶性抗原的兔血清,观察本室制备的猪带绦虫六钩蚴期特异性抗原基因TSO45-4B的重组核酸疫苗pcDNA3.1/TSO45-4B经肌肉接种后在宿主体内的表达.方法:用次氯酸钠法孵化六钩蚴,Dot-B1ot、ELISA检测兔血清中特异性抗体及滴度;以pcDNA3.1/TS045-4B进行体内转染,继之免疫组化法观察其在鼠体骨骼肌的表达.结果:抗六钩蚴兔血清多克隆抗体制备成功,抗体效价为1:20 100;免疫组化染色后在重组质粒注射部位肌肉组织的肌纤维内显示阳性的棕黄色分泌颗粒.结论:重组质粒在小鼠骨骼肌内成功地表达为猪囊尾蚴病多基因DNA疫苗的研制提供了体内表达的依据之一.     

贵州省都匀地区亚洲牛带绦虫病的流行病学调查

目的：了解亚洲牛带绦虫病在我省都匀地区的流行特点。方法：采用传统流行病学调查方法（即：询问病史、驱虫、肛门拭子法等），对都匀米秀地区相邻六个村寨进行实地调查，并对70位有临床表现的成人（男性67，女性3）进行驱虫治疗。结果：在67例男性患者中有24人驱出虫体；在3例女性患者中有1人驱出虫体，成人感染率为35．4％；对100名儿童，进行了肛门拭子法查虫卵，均未检出。结论：贵州省都匀地区亚洲牛带绦虫病感染严重，患者主要是男性青壮年。