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Generation of Helicobacter pylori Ghosts by PhiX Protein E-Mediated Inactivation and Their Evaluation as Vaccine Candidates

机译:通过PhiX蛋白E介导的灭活产生幽门螺杆菌幽灵及其作为疫苗候选者的评估

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Bacterial ghosts are empty cell envelopes, which may be generated by the controlled expression of the PhiX174 lysis gene E in gram-negative bacteria to obtain vaccine candidates. We describe here the application of this technology to Helicobacter pylori. The lysis gene cassette was cloned into an Escherichia coli-Helicobacter pylori shuttle vector and introduced into an H. pylori recipient strain by bacterial conjugation. Temperature induction of the lysis gene cassette revealed a quantitative killing of the H. pylori culture without induction of lysis-resistant bacteria. Biochemical and transmission electron microscopic studies identified structurally intact H. pylori. Prophylactic oral vaccination experiments using these H. pylori ghosts in the BALB/c mouse model showed a significant reduction of the bacterial load in the ghost group, as measured by a quantitative bacterial reisolation procedure. Ten of 10 and 5 of 10 mice were protected, respectively, without the use of a mucosal adjuvant. Coadministration of ghosts with cholera toxin as mucosal adjuvant resulted in a complete protection of 10 of 10 and 8 of 8 mice against H. pylori challenge, with three animals showing a sterile immunity.
机译:细菌鬼魂是空细胞被膜,它可能是由革兰氏阴性菌中PhiX174裂解基因 E 的受控表达产生的,从而获得了候选疫苗。我们在这里描述了这项技术在幽门螺杆菌中的应用。将裂解基因盒克隆到大肠杆菌-幽门螺旋杆菌穿梭载体中,并导入 H。细菌结合产生幽门螺旋杆菌受体菌株。裂解基因盒的温度诱导显示定量杀死 H。无需诱导抗裂解细菌的幽门螺杆菌培养。生化和透射电子显微镜研究确定了结构完整的 H。使用这些 H进行预防性口服疫苗接种的实验。通过定量细菌再分离程序测量,BALB / c小鼠模型中的幽门螺杆菌幽灵显示出幽灵组中细菌载量的显着降低。在不使用粘膜佐剂的情况下分别保护了10只小鼠中的10只和10只小鼠中的5只。幽灵与霍乱毒素作为粘膜佐剂的共同给药导致对10只小鼠中的10只和8只小鼠中的8只针对 H的完全保护。幽门螺杆菌攻击,三只动物表现出无菌免疫力。

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