病毒对成纤维网状细胞的靶向作用有助于慢性感染期间的免疫抑制和病毒持续存在。

Viral targeting of fibroblastic reticular cells contributes to immunosuppression and persistence during chronic infection.

作者信息

Mueller Scott N, Matloubian Mehrdad, Clemens Daniel M, Sharpe Arlene H, Freeman Gordon J, Gangappa Shivaprakash, Larsen Christian P, Ahmed Rafi

机构信息

Emory Vaccine Center and Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322, USA.

出版信息

Proc Natl Acad Sci U S A. 2007 Sep 25;104(39):15430-5. doi: 10.1073/pnas.0702579104. Epub 2007 Sep 18.

Abstract

Many chronic viral infections are marked by pathogen persistence and a generalized immunosuppression. The exact mechanisms by which this occurs are still unknown. Using a mouse model of persistent lymphocytic choriomeningitis virus (LCMV) infection, we demonstrate viral targeting of fibroblastic reticular cells (FRC) in the lymphoid organs. The FRC stromal networks are critical for proper lymphoid architecture and function. High numbers of FRC were infected by LCMV clone 13, which causes a chronic infection, whereas few were infected by the acute strain, LCMV Armstrong. The function of the FRC conduit network was altered after clone 13 infection by the action of CD8(+) T cells. Importantly, expression of the inhibitory programmed death ligand 1, which was up-regulated on FRC after infection, reduced early CD8(+) T cell-mediated immunopathology and prevented destruction of the FRC architecture in the spleen. Together, this reveals an important tropism during a persistent viral infection. These data also suggest that the inhibitory PD-1 pathway, which likely evolved to prevent excessive immunopathology, may contribute to viral persistence in FRC during chronic infection.

摘要

许多慢性病毒感染的特征是病原体持续存在和全身性免疫抑制。其发生的确切机制仍不清楚。利用持续性淋巴细胞性脉络丛脑膜炎病毒(LCMV)感染的小鼠模型,我们证明了病毒对淋巴器官中纤维母细胞网状细胞(FRC)的靶向作用。FRC基质网络对于正常的淋巴结构和功能至关重要。大量的FRC被导致慢性感染的LCMV克隆13感染,而被急性毒株LCMV阿姆斯特朗感染的则很少。克隆13感染后,通过CD8(+) T细胞的作用,FRC管道网络的功能发生了改变。重要的是,感染后FRC上上调的抑制性程序性死亡配体1的表达减少了早期CD8(+) T细胞介导的免疫病理,并防止了脾脏中FRC结构的破坏。总之,这揭示了持续性病毒感染期间的一种重要嗜性。这些数据还表明,可能进化以防止过度免疫病理的抑制性PD-1途径可能在慢性感染期间促成病毒在FRC中的持续存在。

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