Development of Autologous C5 Vaccine Nanoparticles to Reduce Intravascular Hemolysis in Vivo.

Development of Autologous C5 Vaccine Nanoparticles to Reduce Intravascular Hemolysis in Vivo.
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开发自体 C5 疫苗纳米颗粒以减少体内血管内溶血。

DOI:
10.1021/acschembio.6b00994
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发表时间:
2017
影响因子:
4
通讯作者:
Lin,Feng
Lin,Feng
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang,Lingjun;Qiu,Wen;Crooke,Stephen;Li,Yan;Abid,Areeba;Xu,Bin;Finn,MG;Lin,Feng

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补体系统正在成为治疗许多疾病的新靶点。例如,Eculizumab 是一种针对补体成分 5 (C5) 的人源化单克隆抗体,已被批准用于治疗阵发性睡眠性血红蛋白尿症 (PNH),该病患者的红细胞被补体裂解。在这项研究中,我们开发了疫苗来诱导小鼠产生自体抗 C5 抗体,以抑制补体。用保守的 C5 异种蛋白对小鼠进行免疫接种,可提高针对异种 C5 的 IgG 滴度,但这些抗体不会降低血液中的 C5 活性。相比之下,含有多个预测表位和耐受破坏肽的自体小鼠 C5 疫苗被发现可诱导体内产生抗 C5 自身抗体,从而降低血液中的溶血活性。我们进一步验证了这种 C5 疫苗中的肽表位,并创建了重组病毒样颗粒 (VLP),展示了与耐受破坏肽融合的该表位。在 PNH 模型中,用这些新型纳米粒子对小鼠进行免疫接种,可引发针对重组小鼠 C5 的强烈体液反应,降低溶血活性,并保护小鼠免受补体介导的血管内溶血。这项概念验证研究表明,基于 C5 的自体疫苗可以成为治疗 PNH 等补体介导疾病的有效替代品或补充剂。
The complement system is emerging as a new target for treating many diseases. For example, Eculizumab, a humanized monoclonal antibody against complement component 5 (C5), has been approved for paroxysmal nocturnal hemoglobinuria (PNH) in which patient erythrocytes are lysed by complement. In this study, we developed vaccines to elicit autologous anti-C5 antibody production in mice for complement inhibition. Immunization of mice with a conservative C5 xenoprotein raised high titers of IgG’s against the xenogenous C5, but these antibodies did not reduce C5 activity in the blood. In contrast, an autologous mouse C5 vaccine containing multiple predicted epitopes together with a tolerance-breaking peptide was found to induce anti-C5 autoantibody productionin vivo, resulting in decreased hemolytic activity in the blood. We further validated a peptide epitope within this C5 vaccine and created recombinant virus-like particles (VLPs) displaying this epitope fused with the tolerance breaking peptide. Immunizing mice with these novel nanoparticles elicited strong humoral responses against recombinant mouse C5, reduced hemolytic activity, and protected the mice from complement-mediated intravascular hemolysis in a model of PNH. This proof-of-concept study demonstrated that autologous C5-based vaccines could be an effective alternative or supplement for treating complement-mediated diseases such as PNH.
基于树突状细胞的异种抗原疫苗接种用于前列腺癌免疫治疗1
DOI: --
发表时间: 2001
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