期刊
PLOS ONE
卷 16, 期 4, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0250340
关键词
-
资金
- Pennsylvania State University College of Medicine
- H. G. Barsumian Fund
This study investigated the role of dendritic cells (DCs) in the development of autoimmune disease, particularly in relation to self-reactive CD4(+) T cells in multiple sclerosis (MS). The findings indicate that DC deficiency can reduce immune tolerance to self-antigens, such as PLP, leading to accelerated onset of EAE. Additionally, non-DC cells were shown to effectively present CNS myelin antigens to self-reactive T cells in the absence of DCs, exacerbating EAE.
Experimental autoimmune encephalomyelitis (EAE) is an established animal model of multiple sclerosis (MS). Inflammatory CD4(+) T cell responses directed against CNS antigens, including myelin proteolipid protein (PLP), are key mediators of EAE. Dendritic cells (DCs) are critical for the induction of T cell responses against infectious agents. However, the importance of DCs in priming self-reactive CD4(+) T cells in autoimmune disease such as MS has been unclear. To determine the requirement of DCs in PLP-specific CD4(+) T cell responses and EAE, we genetically deleted CD11c(+) DCs in PLP T cell receptor (TCR) transgenic SJL mice constitutively. DC deficiency did not impair the development, selection or the pathogenic function of PLP-specific CD4(+) T cells in these mice, and resulted in accelerated spontaneous EAE compared to DC sufficient controls. In addition, using a genetic approach to ablate DCs conditionally in SJL mice, we show that CD11c(+) DCs were dispensable for presenting exogenous or endogenous myelin antigen to PLP-specific T cells and for promoting pro-inflammatory T cell responses and severe EAE. Our findings demonstrate that constitutive or conditional ablation of CD11c(+) DCs diminished self-tolerance to PLP autoantigen. They further show that in the absence of DCs, non-DCs can efficiently present CNS myelin antigens such as PLP to self-reactive T cells, resulting in accelerated onset of spontaneous or induced EAE.
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