摘要: 利用抑制削减杂交法筛选日本血吸虫雌雄虫差异基因,从中获得真核翻译起始因子5基因(eIF5)的 表达序列标。对该序列进行生物信息学分析:对其5’端进行电子延伸,获得含完整开放阅读框的cDNA序列 (AY686501)。将其亚克隆到表达载体pET-28c,进行重组表达。免疫保护效果实验表明,重组表达蛋白具有显著 抑制血吸虫卵在寄主肝脏中的沉积效果。

摘要: This paper was about the study on the mechanism of Microtus fortis against Schistosoma japonicum. Firstly, we confirmed that Microtus fortis came from epidemic region (Dongting Lake beaches) and non epidemic region (Qingtong Gorge in Ningxia province) were both resistant to Schistosoma japonicum infection after re infection tests for several times. It seemed that their resistant ability was inheritable rather than acquired. Secondly, it was demonstrated by in vivo check up and in vitro killing assay that there were some native antibodies of IgG3 subclass specifically to the schistosomula and adult worm of Schistosoma japonicum in Microtus fortis, which probably played an important role in resisting Schistosoma japonicum associated with complement. It was shown that macrophages and eosinophils in abdominal cavity of Microtus fortis had native ability of adhering to the schistosomula of Schistosoma japonicum. Then, the adult worm cDNA library of Schistosoma japonicum was screened with sera from Microtus fortis . Five positive clones were obtained, four of which were identified as new genes. Full length cDNA of the two new genes were isolated by RACE. DNA vaccine was constructed with one named EST mfs 3. After the Kunming mice immunized with this vaccine, the worm reduction rate and the egg reduction rate were 28.4% and 21.73% compared with that in control group respectively. This kind of DNA based EST mfs 3 vaccine was highly expressed in E.coli and induecd strong immune response in challenged group. Finally, two groups of cDNA probes prepared from liver and lung of Microtus fortis with or without Schistosoma japonicum infection were hybridized to the cDNA chip prepared from rat respectively. 156 and 332 genes revealed differential expression in infectious group compared with normal group. In conclusion, there would be many factors contribute to the mechanism of Microtus fortis against Schistosoma japonicum. We should stress the essentials and make further research on how to take advantage of them to defend us from Schistosoma japonicum infection.

摘要: 采用免疫亲和层析法,从感染日本血吸虫的兔血清中提纯日本血吸虫病循环抗原。经SDS-聚丙烯酰胺凝胶电泳、PAS染色、酶联免疫印渍等方法分析,日本血吸虫病循环抗原显示7个组份,分子量分别为144、118、100、88、63、57、46kD;其中144、118、100、63、57kD为糖蛋白,并证实虫卵释放的循环抗原中含分子量分别为144、118kD的糖蛋白。

摘要: 湖南洞庭湖滩上的东方田鼠,是已知啮齿动物中唯一对日本血吸虫感染有颉抗作用的野生鼠类。本研究对该鼠在实验室内饲养特性进行观察,说明可以用普通饲养仓鼠的方法饲养繁育成功。通过人工感染日本血吸虫尾蚴证明,不论是接触过疫水的野生田鼠,或实验室内繁殖的未接触过疫水的第二代田鼠,均有抗感染现象。