目的 观察电子束照射对体外培养的细粒棘球蚴形态结构、死亡率及其p38 mRNA表达的影响。方法 采集自然感染的绵羊肝中的细粒棘球蚴原头蚴,随机分成3组,分别用0 Gy、30 Gy、60 Gy的不同剂量的6 MeV电子束各照射1次,照射后连续培养3 d、14 d,光镜观察虫体的大体变化及死亡率,qRT-PCR法测定p38基因的表达水平。结果 60 Gy组较0 Gy、30 Gy组原头蚴变性坏死数目明显增多,死亡率有差异（P<0.0125）,连续培养天数（3 d、14 d）对虫体死亡率无影响。经电子束照射后,30 Gy、60 Gy组原头蚴p38 mRNA表达水平较0 Gy组升高（P<0.05）。结论 体外培养的原头蚴经电子束照射后大体形态结构发生明显变化、死亡率升高,且与电子束的剂量存在量效关系;p38 mRNA的表达量随着电子束的剂量的增加而升高,p38基因可能参与电子束所致体外杀伤棘球蚴的作用机制。

Objective To observe the effect of 6 MeV electron beam on the morphological structure,mortality rate and expression of p38 mRNA and in Echinococcus granulosus．Methods Einococcus granulosus was collected from natural infected sheep liver and divided into 3 groups randomly,then irradiated by 6 MeV electron beam of 0 Gy,30 Gy and 60 Gy,respectively．After culturing for 3 and 14 days,the gross change and mortality of worms were observed by light microscopy and the expression level of p38 gene was determined by qRT-PCR．Results In 60 Gy group,compared with 0 Gy and 30 Gy group,the gross morphology and structure have changed significantly,the mortality rate was significantly different（P <0.0125）．Days of culture（3 days,14 days）had no obvious effect on mortality,and the p38 mRNA expression levels in 30 Gy and 60 Gy group were significantly higher than 0 Gy group（P <0.05）．Conclusions The gross morphology,structure changes and mortality of Einococcus granulosus increases significantly after electron beam irradiation and has obvious quantitative and effective relationship with the electron beam dose,the p38 gene may be involved in the mechanism of in vitro killing by electron beam.