Department of Biology, Viral Immunology Center, Georgia State University, Atlanta, GA, United States.
Department of Ophthalmology, Emory University School of Medicine, Atlanta, GA, United States.
Front Immunol. 2019 Apr 11;10:732. doi: 10.3389/fimmu.2019.00732. eCollection 2019.
Suppressor of cytokine signaling (SOCS) proteins provide selective negative feedback to prevent pathogeneses caused by overstimulation of the immune system. Of the eight known SOCS proteins, SOCS1 and SOCS3 are the best studied, and systemic deletion of either gene causes early lethality in mice. Many viruses, including herpesviruses such as herpes simplex virus and cytomegalovirus, can manipulate expression of these host proteins, with overstimulation of SOCS1 and/or SOCS3 putatively facilitating viral evasion of immune surveillance, and SOCS suppression generally exacerbating immunopathogenesis. This is particularly poignant within the eye, which contains a diverse assortment of specialized cell types working together in a tightly controlled microenvironment of immune privilege. When the immune privilege of the ocular compartment fails, inflammation causing severe immunopathogenesis and permanent, sight-threatening damage may occur, as in the case of AIDS-related human cytomegalovirus (HCMV) retinitis. Herein we review how SOCS1 and SOCS3 impact the virologic, immunologic, and/or pathologic outcomes of herpesvirus infection with particular emphasis on retinitis caused by HCMV or its mouse model experimental counterpart, murine cytomegalovirus (MCMV). The accumulated data suggests that SOCS1 and/or SOCS3 can differentially affect the severity of viral diseases in a highly cell-type-specific manner, reflecting the diversity and complexity of herpesvirus infection and the ocular compartment.
细胞因子信号转导抑制蛋白(SOCS)提供选择性的负反馈,以防止免疫系统过度刺激引起的发病机制。在已知的 8 种 SOCS 蛋白中,SOCS1 和 SOCS3 研究得最多,系统性缺失这两种基因的任何一种都会导致小鼠早期死亡。许多病毒,包括单纯疱疹病毒和巨细胞病毒等疱疹病毒,可以操纵这些宿主蛋白的表达,SOCS1 和/或 SOCS3 的过度刺激可能有助于病毒逃避免疫监视,而 SOCS 的抑制通常会加重免疫发病机制。在眼睛中尤其明显,眼睛包含各种专门的细胞类型,它们在免疫特权的紧密控制微环境中协同工作。当眼部隔室的免疫特权失效时,可能会发生引起严重免疫发病机制和永久性视力威胁的炎症,如艾滋病相关的人类巨细胞病毒(HCMV)视网膜炎。本文综述了 SOCS1 和 SOCS3 如何影响疱疹病毒感染的病毒学、免疫学和/或病理学结果,特别强调了 HCMV 或其小鼠模型实验对应物鼠巨细胞病毒(MCMV)引起的视网膜炎。累积的数据表明,SOCS1 和/或 SOCS3 可以以高度细胞类型特异性的方式,不同程度地影响病毒疾病的严重程度,反映了疱疹病毒感染和眼部隔室的多样性和复杂性。