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组 2 先天淋巴细胞(ILC2)在肺部隐球菌病期间抑制有益的 1 型免疫反应。

Group 2 Innate Lymphoid Cells (ILC2) Suppress Beneficial Type 1 Immune Responses During Pulmonary Cryptococcosis.

机构信息

Medizinische Klinik 1, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.

Mikrobiologisches Institut - Klinische Mikrobiologie, Immunologie und Hygiene, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.

出版信息

Front Immunol. 2020 Feb 14;11:209. doi: 10.3389/fimmu.2020.00209. eCollection 2020.

Abstract

is an opportunistic fungal pathogen preferentially causing disease in immunocompromised individuals such as organ-transplant-recipients, patients receiving immunosuppressive medications or, in particular, individuals suffering from HIV infection. Numerous studies clearly indicated that the control of infections is strongly dependent on a prototypic type 1 immune response and classical macrophage activation, whereas type 2-biased immunity and alternative activation of macrophages has been rather implicated in disease progression and detrimental outcomes. However, little is known about regulatory pathways modulating and balancing immune responses during early phases of pulmonary cryptococcosis. Here, we analyzed the role of group 2 innate lymphoid cells (ILC2s) for the control of infection. Using an intranasal infection model with a highly virulent strain, we found that ILC2 numbers were strongly increased in -infected lungs along with induction of a type 2 response. Mice lacking ILC2s due to conditional deficiency of the transcription factor RAR-related orphan receptor alpha (Rora) displayed a massive downregulation of features of type 2 immunity as reflected by reduced levels of the type 2 signature cytokines IL-4, IL-5, and IL-13 at 14 days post-infection. Moreover, ILC2 deficiency was accompanied with increased type 1 immunity and classical macrophage activation, while the pulmonary numbers of eosinophils and alternatively activated macrophages were reduced in these mice. Importantly, this shift in pulmonary macrophage polarization in ILC2-deficient mice correlated with improved fungal control and prolonged survival of infected mice. Conversely, adoptive transfer of ILC2s was associated with a type 2 bias associated with less efficient anti-fungal immunity in lungs of recipient mice. Collectively, our date indicate a non-redundant role of ILC2 in orchestrating myeloid anti-cryptococcal immune responses toward a disease exacerbating phenotype.

摘要

是一种机会性真菌病原体,优先导致免疫功能低下的个体发病,如器官移植受者、接受免疫抑制药物治疗的患者,特别是感染 HIV 的个体。许多研究清楚地表明,对感染的控制强烈依赖于典型的 1 型免疫反应和经典的巨噬细胞激活,而 2 型偏向免疫和巨噬细胞的替代激活则与疾病进展和不良结局有关。然而,对于调节和平衡肺部隐球菌病早期阶段免疫反应的调控途径知之甚少。在这里,我们分析了 2 型固有淋巴细胞(ILC2)在控制感染中的作用。使用一种具有高毒力菌株的鼻腔内感染模型,我们发现 ILC2 数量在肺部感染后强烈增加,同时诱导 2 型反应。由于转录因子 RAR 相关孤儿受体 alpha(Rora)的条件缺失导致 ILC2 缺失的小鼠显示 2 型免疫特征的大量下调,这反映在感染后 14 天,2 型特征细胞因子 IL-4、IL-5 和 IL-13 的水平降低。此外,ILC2 缺失伴随着 1 型免疫和经典巨噬细胞激活的增加,而这些小鼠肺部的嗜酸性粒细胞和替代激活的巨噬细胞数量减少。重要的是,在 ILC2 缺陷小鼠中,肺部巨噬细胞极化的这种转变与真菌控制的改善和感染小鼠的存活时间延长相关。相反,ILC2 的过继转移与 2 型偏向相关,与受者小鼠肺部抗真菌免疫效率降低相关。总之,我们的数据表明,ILC2 在协调髓样抗隐球菌免疫反应方面具有非冗余作用,向疾病加重表型发展。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/108b/7034304/b9eb1f4d2b06/fimmu-11-00209-g0001.jpg

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