ZFAND6 regulation of innate antiviral immunity

ZFAND6 对先天抗病毒免疫的调节

• 批准号: 9979076
• 负责人: EDWARD W HARHAJ
• 金额: $ 23.75万
• 依托单位: PENNSYLVANIA STATE UNIV HERSHEY MED CTR
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-03-16 至 2022-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9979076
• 关键词: A20 protein; Address; Agonist; Antiviral Agents; Automobile Driving; Binding; Biological; Bone Marrow; C-terminal; Cachexia; Cells; DNA; DNA Viruses; Development; Dose; Down-Regulation; Enzymes; Family; Family member; Feedback; Fibroblasts; Foundations; Frequencies; Gene Targeting; Genes; Herpesvirus 1; Homeostasis; Human Genome; IRF1 gene; IRF3 gene; Immune; Immune signaling; Infection; Inflammation; Inflammatory; Inflammatory Response; Influenza A virus; Innate Immune Response; Interferon Type I; Interferons; Investigation; Knockout Mice; Knowledge; Link; Lung; Lung Inflammation; Lysine; Mediating; Molecular; Morbidity - disease rate; Mus; N-terminal; Natural Immunity; Nucleic Acids; PRKCA gene; Pathogenicity; Pathway interactions; Pattern; Pattern recognition receptor; Phosphotransferases; Physiological; Plants; Play; Polyubiquitin; Proteins; Publishing; Pulmonary Inflammation; RNA; RNA Viruses; Regulation; Reporter; Resistance; Role; Sequence Homology; Signal Pathway; Signal Transduction; Signaling Protein; Spleen; Stains; Stimulus; Stress-Induced Protein; Tissues; Toll-like receptors; Transferase; Ubiquitin; Vesicular stomatitis Indiana virus; Viral; Viral Load result; Virus; Virus Diseases; Wild Type Mouse; Zinc Fingers; antiviral immunity; cell type; chemokine; cytokine; experimental study; fitness; gene induction; gut microbiota; helicase; immune activation; immunopathology; insight; macrophage; mortality; novel therapeutics; ovarian neoplasm; overexpression; pathogen; pathogenic virus; prevent; protein degradation; protein function; reconstitution; repaired; response; stress tolerance; transcription factor; transcriptome sequencing; viral DNA

ABSTRACT The A20 ubiquitin-editing enzyme is a key negative regulator of NF-κB and innate immune signaling pathways. A20 contains seven zinc finger (ZF1-7) domains, of which ZF4 interacts with lysine 63 (K63)-linked polyubiquitin chains to suppress NF-κB signaling. Including A20, there are 10 genes containing A20 ZF domains encoded in the human genome; however, with the exception of A20 the functions of these proteins are poorly understood. ZFAND6 (also known as AWP1) contains an A20-like ZF domain that shares significant sequence homology with A20 ZF4, and also harbors an AN1-type ZF. Although published overexpression studies suggest that ZFAND6 may inhibit NF-κB, the specific pathways regulated by ZFAND6 and its physiological roles have remained elusive. In preliminary studies for this exploratory proposal, we have used gene targeting to generate mice lacking the Zfand6 gene. Zfand6–/– mice are born at expected Mendelian frequencies with no obvious developmental or immune abnormalities. RNA sequencing of Zfand6–/– bone marrow-derived macrophages revealed spontaneous induction of interferon-stimulated genes (ISGs), which rendered these cells highly resistant to infection with a broad range of DNA and RNA viruses. The DNA sensing pathway adaptor STING and the antiviral transcription factor IRF1 were both upregulated in Zfand6–/– cells, which may drive the resistance of ZFAND6-deficient cells to virus infection. ISGs were upregulated in the spleen, but not in the lungs, of Zfand6–/– mice, and knockout mice were more susceptible than wild-type mice to mortality upon challenge with a low dose of influenza A virus (IAV) despite comparable viral loads. Therefore, loss of ZFAND6 may perturb immune homeostasis and exacerbate virus-induced inflammation and immunopathology. The central hypothesis driving these investigations is that ZFAND6 targets key innate immune signaling proteins for degradation to prevent the spontaneous induction of ISGs which may contribute to overexuberant inflammation triggered by virus infection. To address this hypothesis we will perform the following Specific Aims: 1) Determine the mechanisms of ZFAND6 inhibition of antiviral signaling, and 2) Determine the role of ZFAND6 in regulating the inflammatory response to IAV infection. Completion of these studies will define a physiological role for ZFAND6 in restricting innate antiviral immunity and expand our knowledge on the mechanisms of immune homeostasis which serve to mitigate virus-induced inflammation.

摘要 A20泛素编辑酶是核因子-κB和天然免疫信号通路的关键负调控因子。 A20含有7个锌指(ZF1-7)结构域，其中ZF4与赖氨酸63(K63)连接 抑制NF-κB信号转导的多泛素链。包括A20在内，有10个基因含有A20 ZF 人类基因组中编码的结构域；然而，除了A20以外，这些蛋白质的功能 人们对此了解甚少。ZFAND6(也称为AWP1)包含一个类似A20的ZF结构域，它具有重要的 与A20ZF4序列同源性，也含有AN1型ZF。虽然发表了过度表达 研究表明，ZFAND6可能抑制NF-κB，这是ZFAND6及其受体调控的特定信号通路。 生理角色仍然难以捉摸。在对这一探索性建议的初步研究中，我们使用了 基因打靶以产生缺乏Zfand6基因的小鼠。Zfand6-/-小鼠在预期的孟德尔出生 无明显发育或免疫异常的频率。Zfand6-/-骨的RNA测序 骨髓来源的巨噬细胞显示自发诱导干扰素刺激基因(ISGs)，这是 使这些细胞对广泛的DNA和RNA病毒感染具有高度抵抗力。DNA 感觉通路接头刺痛和抗病毒转录因子IRF1在Zfand6-/-中均上调 细胞，这可能驱动ZFAND6缺陷细胞对病毒感染的抵抗力。ISG在 Zfand6-/-小鼠和基因敲除小鼠比野生型小鼠更易患脾，但不在肺 与低剂量甲型流感病毒(IAV)攻击时的死亡率，尽管病毒载量相当。 因此，ZFAND6的缺失可能会扰乱免疫稳态，加剧病毒诱导的炎症和 免疫病理学。推动这些研究的中心假设是ZFAND6针对关键的先天 免疫信号蛋白的降解，以防止自发诱导的ISG，这可能有助于 病毒感染引发的过度炎症。为了解决这一假设，我们将执行 具体目标如下：1)确定ZFAND6抑制抗病毒信号的机制；2) 确定ZFAND6在调节IAV感染的炎症反应中的作用。完成这些工作 研究将确定ZFAND6在限制先天抗病毒免疫中的生理作用，并扩大我们的 了解免疫动态平衡的机制，以减轻病毒引起的炎症。