Complement Component 3 Regulates IFN-α Production by Plasmacytoid Dendritic Cells following TLR7 Activation by a Plant Virus–like Nanoparticle

TLR7型 补语(音乐) 组分(热力学) 细胞生物学 补体系统 病毒 补体成分3 化学 生物 病毒学 免疫学 替代补体途径 先天免疫系统 受体 Toll样受体 抗体 生物化学 基因 物理 互补 表型 热力学
作者
Marie‐Ève Lebel,Marie-Pierre Langlois,Jean‐François Daudelin,Esther Tarrab,Pierre Savard,Denis Leclerc,Alain Lamarre
出处
期刊:Journal of Immunology [American Association of Immunologists]
卷期号:198 (1): 292-299 被引量:23
标识
DOI:10.4049/jimmunol.1601271
摘要

Abstract The increasing use of plant viruses for the development of new vaccines and immunotherapy approaches poses questions regarding the mechanism by which the mammalian immune system recognizes these viruses. For example, although natural Abs (NA) and complement are key components of the innate immune system involved in the opsonization, phagocytosis, and destruction of microorganisms infecting mammals, their implication in plant virus recognition and immunogenicity is not well defined. In this study, we address the involvement of NA and the complement system in the activation of innate immunity through engagement of TLR7 with papaya mosaic virus (PapMV)-like nanoparticles. We demonstrate that NA, although binding to PapMV, are not involved in its recognition by the immune system. On the other hand, C3 strongly binds to PapMV nanoparticles and its depletion significantly reduces PapMV’s interaction with immune cells. Unexpectedly, however, we observed increased immune cell activation following administration of PapMV to complement-depleted mice. TLR7 activation by PapMV in the absence of C3 induced higher IFN-α production, resulting in superior immune cell activation and increased immunotherapeutic properties. In conclusion, in this study we established the involvement of the complement system in the recognition and the phagocytosis of PapMV nanoparticles and identified an unsuspected role for C3 in regulating the production of IFN-α following TLR7 activation.

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