打破有免疫力的忍耐到 prion (PrP ) 的目的蛋白质使用 DNA 疫苗。四个不同人的 prion DNA 疫苗的候选人基于 pcDNA3.1 向量被构造的方法:表示野类型的 PrP 的 PrP-WT,表示 PrP 的 Ubiq-PrP 熔化了到 ubiquitin,表示 PrP 的 PrP-LII 熔化了到 lysosomal 积分膜蛋白质类型 II 指向 lysosome 信号,和 PrP -- 嗯表示找到 ER 的 PrP。用主要增加的策略, DNA 三剂量疫苗肌内地被注入 Balb/c 老鼠,由 PrP 的二剂量列在后面蛋白质。在最后免疫, sera 和怒气以后的二个星期被收集, PrP 特定的体液、细胞的有免疫力的回答由 ELISA 和 ELISPOT 测试评估了。浆液 PrP 抗体高级的结果在使用 DNA priming 的策略种牛痘由蛋白质增加跟随了的老鼠被检测。这些, WT-PrP, Ubiq-PrP,和 PrP-LII 导致了显著地更高的体液的回答。显著地显示出的 ELISPOT 测试增加了 IFN 的数字 -- 在老鼠的 secreting T 房间用蛋白质与 recombinant PrP23-90 和 PrP23-231 在刺激以后增加跟随的 DNA priming 的策略种牛痘。PrP -- 嗯导致了最强壮的 T 房间反应。结论 Prion 疫苗能打破忍耐到 PrP 蛋白质并且导致 PrP 特定的体液、细胞的有免疫力的回答。
Objective To break immune tolerance to prion (PrP) proteins using DNA vaccines.Methods Four different human prion DNA vaccine candidates were constructed based on the pcDNA3.1 vector:PrP‐WT expressing wild‐type PrP,Ubiq‐PrP expressing PrP fused to ubiquitin,PrP‐LII expressing PrP fused to the lysosomal integral membrane protein type II lysosome‐targeting signal,and PrP‐ER expressing PrP locating the ER.Using a prime‐boost strategy,three‐doses of DNA vaccine were injected intramuscularly into Balb/c mice,followed by two doses of PrP protein.Two weeks after the last immunization,sera and spleens were collected and PrP‐specific humoral and cellular immune responses evaluated by ELISA and ELISPOT tests.Results Higher levels of serum PrP antibodies were detected in mice vaccinated using the strategy of DNA priming followed by protein boosting.Of these,WT‐PrP,Ubiq‐PrP,and PrP‐LII induced significantly higher humoral responses.ELISPOT tests showed markedly increased numbers of IFN‐γ‐secreting T cells in mice vaccinated using the strategy of DNA priming followed by protein boosting after stimulation with recombinant PrP23‐90 and PrP23‐231.PrP‐ER inducedthe strongest T‐cell response.Conclusion Prion vaccines can break tolerance to PrP proteins and induce PrP‐specific humoral and cellular immune responses.