A Plasmodium Cross-Stage Antigen Contributes to the Development of Experimental Cerebral Malaria.

A Plasmodium Cross-Stage Antigen Contributes to the Development of Experimental Cerebral Malaria.
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DOI:
10.3389/fimmu.2018.01875
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发表时间:
2018
影响因子:
7.3
通讯作者:
Mueller AK
Mueller AK
中科院分区:
医学2区
文献类型:
--
作者:
Fernandes P;Howland SW;Heiss K;Hoffmann A;Hernández-Castañeda MA;Obrová K;Frank R;Wiedemann P;Bendzus M;Rénia L;Mueller AK

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脑型疟疾是一种复杂的神经系统综合征,由恶性疟原虫寄生虫感染引起,并且完全归因于感染病理血液阶段的一系列宿主-寄生虫相互作用。相反,之前的肝内复制阶段通常被认为在临床上是沉默的,因此被排除在神经系统症状的发展中发挥任何作用。然而,在这项研究中,我们提出了一种抗原 PbmaLS_05,它在红细胞前和红细胞内阶段均呈递给宿主免疫系统,并有助于小鼠脑型疟疾的发展。尽管内源性 PbmaLS_05 的缺失阻止了易感小鼠在子孢子和受感染的红细胞 (iRBC) 感染后发生实验性脑型疟疾 (ECM),但我们观察到两种接种模式对宿主免疫反应的贡献存在显着差异。此外,PbmaLS_05 特异性 CD8+ T 细胞促进子孢子感染后 ECM 的发展,但不促进 iRBC 感染,这表明像 PbmaLS_05 这样的前红细胞抗原也可能促进脑部症状的发展。因此,我们的数据强调了自然感染途径在 ECM 研究中的重要性,对疟疾疫苗和治疗策略具有潜在影响。
Cerebral malaria is a complex neurological syndrome caused by an infection with Plasmodium falciparum parasites and is exclusively attributed to a series of host–parasite interactions at the pathological blood-stage of infection. In contrast, the preceding intra-hepatic phase of replication is generally considered clinically silent and thereby excluded from playing any role in the development of neurological symptoms. In this study, however, we present an antigen PbmaLS_05 that is presented to the host immune system by both pre-erythrocytic and intra-erythrocytic stages and contributes to the development of cerebral malaria in mice. Although deletion of the endogenous PbmaLS_05 prevented the development of experimental cerebral malaria (ECM) in susceptible mice after both sporozoite and infected red blood cell (iRBC) infections, we observed significant differences in contribution of the host immune response between both modes of inoculation. Moreover, PbmaLS_05-specific CD8+ T cells contributed to the development of ECM after sporozoite but not iRBC-infection, suggesting that pre-erythrocytic antigens like PbmaLS_05 can also contribute to the development of cerebral symptoms. Our data thus highlight the importance of the natural route of infection in the study of ECM, with potential implications for vaccine and therapeutic strategies against malaria.
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