Suppr超能文献

缓殖子入侵:迁移连接蛋白的分子剖析和有效的疫苗接种靶标。

Invasion of bradyzoites: Molecular dissection of the moving junction proteins and effective vaccination targets.

机构信息

Department of Experimental Pathology, Immunology and Microbiology, American University of Beirut, 1107 2020 Beirut, Lebanon.

LPHI, CNRS, INSERM, Université de Montpellier, 34095 Montpellier, France.

出版信息

Proc Natl Acad Sci U S A. 2023 Jan 31;120(5):e2219533120. doi: 10.1073/pnas.2219533120. Epub 2023 Jan 24.

Abstract

Toxoplasmosis is a neglected parasitic disease necessitating public health control. Host cell invasion by occurs at different stages of the parasite's life cycle and is crucial for survival and establishment of infection. In tachyzoites, which are responsible for acute toxoplasmosis, invasion involves the formation of a molecular bridge between the parasite and host cell membranes, referred to as the moving junction (MJ). The MJ is shaped by the assembly of AMA1 and RON2, as part of a complex involving additional RONs. While this essential process is well characterized in tachyzoites, the invasion process remains unexplored in bradyzoites, which form cysts and are responsible for chronic toxoplasmosis and contribute to the dissemination of the parasite between hosts. Here, we show that bradyzoites invade host cells in an MJ-dependent fashion but differ in protein composition from the tachyzoite MJ, relying instead on the paralogs AMA2 and AMA4. Functional characterization of AMA4 reveals its key role for cysts burden during the onset of chronic infection, while being dispensable for the acute phase. Immunizations with AMA1 and AMA4, alone or in complex with their rhoptry neck respective partners RON2 and RON2, showed that the AMA1-RON2 pair induces strong protection against acute and chronic infection, while the AMA4-RON2 complex targets more selectively the chronic form. Our study provides important insights into the molecular players of bradyzoite invasion and indicates that invasion of cyst-forming bradyzoites contributes to cyst burden. Furthermore, we validate AMA-RON complexes as potential vaccine candidates to protect against toxoplasmosis.

摘要

刚地弓形虫是一种被忽视的寄生虫病,需要进行公共卫生控制。宿主细胞的入侵发生在寄生虫生命周期的不同阶段,对于生存和感染的建立至关重要。在速殖子中,即负责急性弓形虫病的寄生虫,入侵涉及寄生虫和宿主细胞膜之间形成分子桥,称为移动连接(MJ)。MJ 的形成是由 AMA1 和 RON2 的组装形成的,作为涉及其他 RON 的复合物的一部分。虽然这个基本过程在速殖子中得到了很好的描述,但在缓殖子中,入侵过程仍未被探索,缓殖子形成包囊,负责慢性弓形虫病,并有助于寄生虫在宿主之间的传播。在这里,我们表明,缓殖子以依赖 MJ 的方式入侵宿主细胞,但与速殖子 MJ 的蛋白组成不同,而是依赖于 AMA2 和 AMA4 的旁系同源物。对 AMA4 的功能表征揭示了其在慢性感染开始时对囊肿负担的关键作用,而在急性阶段则是可有可无的。AMA1 和 AMA4 的免疫接种,单独或与它们各自的 rhoptry 颈伙伴 RON2 和 RON2 形成复合物,表明 AMA1-RON2 对急性和慢性感染具有很强的保护作用,而 AMA4-RON2 复合物则更特异性地针对慢性形式。我们的研究为缓殖子入侵的分子机制提供了重要的见解,并表明形成囊肿的缓殖子的入侵有助于囊肿负担。此外,我们验证了 AMA-RON 复合物作为潜在的疫苗候选物,以预防弓形虫病。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8728/9945962/984fbf319e6c/pnas.2219533120fig01.jpg

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验