旋毛虫成囊前期幼虫抗原保护性免疫的研究

目的比较旋毛虫成囊前期幼虫虫体抗原、排泄分泌抗原和表面抗原对小鼠产生的免疫保护作用。方法分别用旋毛虫成囊前期幼虫虫体抗原、排泄分泌抗原、表面抗原免疫小鼠，同时设佐剂组和阴性对照组，间隔7d免疫1次，共3次。末次免疫后7d，每只小鼠用200条旋毛虫感染期幼虫经口进行攻击感染。感染后7d和30d分别检查各组小鼠肠道成虫数和肌幼虫数；用ELISA测血清中抗旋毛虫肌幼虫IgG抗体。结果虫体抗原、排泄分泌抗原、表面抗原和佐剂组的成虫减虫率分别为84．89％、89．73％、85．65％、2．57％；肌幼虫减虫率分别为71．71％、80．98％、73．66％、5．60％。排泄分泌抗原组、表面抗原组的成虫减虫率（P均〈0．05）及肌幼虫减虫率（P均〈0．01）均高于虫体抗原组。各免疫组小鼠血清IgG抗体滴度明显升高，虫体抗原组、排泄分泌抗原组和表面抗原组的几何平均倒数滴度分别为2798．89、3474．51、2984．83，分别为阴性对照组（459．32）的6．09、7．56、6．50倍。结论旋毛虫成囊前期幼虫虫体抗原、排泄分泌抗原和表面抗原均能诱导宿主产生较强的抗攻击感染保护力。成囊前期幼虫的排泄分泌抗原显示出更强的免疫原性。

Protective immunity of Trichinella spiralis encapsulated larva antigens

Objective To compare the immune protective effects of three antigens of Trichinella spiralis encapsulated larvae on mice.Methods The mice were immunized with Trichinella spiralis encapsulated larvae somatic antigen,encapsulated larva excretory-secretory antigen and encapsulated larva surface antigen,3 times with a 7-day interval,and the adjuvant control and normal control group were set up.Seven days after the final immunization,each mouse was orally challenged with 200 Trichinella spirais larvae.The intestinal adult worms and muscle larvae of Trichinella spiralis of each group were recoveried and examined on Day 7 and Day 30 post-challenge,respectively.The level of 8eruln IgG to antigens of Trichinella muscle muscle larvae wa8 detected by ELISA.Results The intestinal adult worms were reduced by 84.89%.89.73%,85.65%.2.57% in the encapsulated larva somatic,excretory-secretory and surface antigen groups,respectively.The muscle lalwae were reduced by 71.71%,80.98%,73.66%,5.60%, respectively.Adtlltwornl reduction rates(P<0.05) and musclelarva reduction rates(P<0.01) of the encapsulated larva excretory-secretory antigen group and surface antigen group were higher than those of encapsulated larva somatic antigen group.The antibody titers in all the immunized groups increased significantly.and the GMRT values of the encapsulated larva somatic,excretory-secretory and surface antigen groups were 32 798.89,3 474.51,2 984.83,respectively,and were 6.09,7.56,6.50 times higher than those of the normal control group(459.32).Conclusions Trichinella spiralis encapsulated larva antigens can induce strong resistance of host to a subsequent challenge infection.Among these antigens,excretory-secretory antigen is more immunogenic.