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Xuan C, Hu R. Chemical Biology Perspectives on STING Agonists as Tumor Immunotherapy. ChemMedChem 2023; 18:e202300405. [PMID: 37794702 DOI: 10.1002/cmdc.202300405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/02/2023] [Accepted: 10/03/2023] [Indexed: 10/06/2023]
Abstract
Stimulator of interferon genes (STING) is a crucial adaptor protein in the innate immune response. STING activation triggers cytokine secretion, including type I interferon and initiates T cell-mediated adaptive immunity. The activated immune system converts "cold tumors" into "hot tumors" that are highly responsive to T cells by recruiting them to the tumor microenvironment, ultimately leading to potent and long-lasting antitumor effects. Unlike most immune checkpoint inhibitors, STING agonists represent a groundbreaking class of innate immune agonists that hold great potential for effectively targeting various cancer populations and are poised to become a blockbuster in tumor immunotherapy. This review will focus on the correlation between the STING signaling pathway and tumor immunity, as well as explore the impact of STING activation on other biological processes. Ultimately, we will summarize the development and optimization of STING agonists from a medicinal chemistry perspective, evaluate their potential in cancer therapy, and identify possible challenges for future advancement.
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Affiliation(s)
- Chenyuan Xuan
- Department of Pharmacology, China Pharmaceutical University, No 24, TongJiaXiang, Gulou District, Nanjing, 210009, P. R. China
| | - Rong Hu
- Department of Pharmacology, China Pharmaceutical University, No 24, TongJiaXiang, Gulou District, Nanjing, 210009, P. R. China
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Ardanuy J, Scanlon KM, Skerry C, Carbonetti NH. DNA-Dependent Interferon Induction and Lung Inflammation in Bordetella pertussis Infection. J Interferon Cytokine Res 2023; 43:478-486. [PMID: 37651198 PMCID: PMC10599430 DOI: 10.1089/jir.2023.0066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 07/20/2023] [Indexed: 09/02/2023] Open
Abstract
Pertussis, caused by Bordetella pertussis, is a resurgent respiratory disease but the molecular mechanisms underlying pathogenesis are poorly understood. We recently showed the importance of type I and type III interferon (IFN) induction and signaling for the development of lung inflammation in B. pertussis-infected mouse models. Classically, these IFNs are induced by signaling through a variety of pattern recognition receptors (PRRs) on host cells. Here, we found that the PRR signaling adaptor molecules MyD88 and TRIF contribute to IFN induction and lung inflammatory pathology during B. pertussis infection. However, the PRRs Toll-like receptors (TLR) 3 and TLR4, which signal through TRIF and MyD88, respectively, played no role in IFN induction. Instead, the DNA-sensing PRRs, TLR9 and STING, were important for induction of type I/III IFN and promotion of inflammatory pathology, indicating that DNA is a major inducer of lung IFN responses in B. pertussis infection. These results increase our understanding of this host-pathogen interaction and identify potential targets for host-directed therapies to reduce B. pertussis-mediated pathology.
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Affiliation(s)
- Jeremy Ardanuy
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Karen M. Scanlon
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Ciaran Skerry
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Nicholas H. Carbonetti
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
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Feng-Ying G, Mai-Xin L, Miao W, Zhi-Gang L, Xiao-Li K, De-Feng Z, Jian-Meng C. Nile tilapia DNA sensor STING is involved in the IFN-β and AP-1 signaling pathways in the immune response dependent on DDX41. Int J Biol Macromol 2023; 225:27-39. [PMID: 36495771 DOI: 10.1016/j.ijbiomac.2022.11.319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 11/14/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Stimulator of interferon genes (STING) plays important roles in innate immunology. In this study, we isolated the STING gene in Nile tilapia, termed OnSTING. Using quantitative RT-PCR, we explored the expression patterns of the OnSTING gene. Using dual-luciferase reporter assays, we revealed the effect of STING overexpression on nuclear factor κB (NF-κB), IFN and AP activation in HEK 293 cells. Using coimmunoprecipitation, the interaction of STING and TRIF was studied. The effect of OnSTING overexpression on the antibacterial activity in tilapia was investigated. The results showed that upon stimulation with Streptococcus agalactiae, the OnSTING transcript was upregulated in all the tested tissues. OnSTING mRNA levels were very stable from 2.5 to 8.5 dpf. Moreover, OnSTING, OnIFN and IRF3 expression was induced by LPS, Poly (I:C), S. agalactiae WC1535 and DCPS in Nile tilapia macrophages. Overexpression of OnSTING and OnDDX41 increased NF-κB activation in HEK293T cells and slightly increased IFN-β activation but had no effect on AP-1 activation. OnSTING interacted with OnDDX41 and OnTBK1. However, OnSTING did not interact with TRIF. OnSTING overexpression in vivo decreased the sensitivity of tilapia to S. agalactiae infection. These results are helpful for clarifying the innate immune response against bacterial infection in Nile tilapia.
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Affiliation(s)
- Gao Feng-Ying
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China; Guangdong Provincial Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China
| | - Lu Mai-Xin
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China; Guangdong Provincial Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China.
| | - Wang Miao
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China; Guangdong Provincial Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China
| | - Liu Zhi-Gang
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China; Guangdong Provincial Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China
| | - Ke Xiao-Li
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China; Guangdong Provincial Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China
| | - Zhang De-Feng
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China; Guangdong Provincial Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China
| | - Cao Jian-Meng
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China; Guangdong Provincial Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China
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Ye G, Liu H, Zhou Q, Liu X, Huang L, Weng C. A Tug of War: Pseudorabies Virus and Host Antiviral Innate Immunity. Viruses 2022; 14:v14030547. [PMID: 35336954 PMCID: PMC8949863 DOI: 10.3390/v14030547] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Revised: 02/25/2022] [Accepted: 03/01/2022] [Indexed: 11/16/2022] Open
Abstract
The non-specific innate immunity can initiate host antiviral innate immune responses within minutes to hours after the invasion of pathogenic microorganisms. Therefore, the natural immune response is the first line of defense for the host to resist the invaders, including viruses, bacteria, fungi. Host pattern recognition receptors (PRRs) in the infected cells or bystander cells recognize pathogen-associated molecular patterns (PAMPs) of invading pathogens and initiate a series of signal cascades, resulting in the expression of type I interferons (IFN-I) and inflammatory cytokines to antagonize the infection of microorganisms. In contrast, the invading pathogens take a variety of mechanisms to inhibit the induction of IFN-I production from avoiding being cleared. Pseudorabies virus (PRV) belongs to the family Herpesviridae, subfamily Alphaherpesvirinae, genus Varicellovirus. PRV is the causative agent of Aujeszky’s disease (AD, pseudorabies). Although the natural host of PRV is swine, it can infect a wide variety of mammals, such as cattle, sheep, cats, and dogs. The disease is usually fatal to these hosts. PRV mainly infects the peripheral nervous system (PNS) in swine. For other species, PRV mainly invades the PNS first and then progresses to the central nervous system (CNS), which leads to acute death of the host with serious clinical and neurological symptoms. In recent years, new PRV variant strains have appeared in some areas, and sporadic cases of PRV infection in humans have also been reported, suggesting that PRV is still an important emerging and re-emerging infectious disease. This review summarizes the strategies of PRV evading host innate immunity and new targets for inhibition of PRV replication, which will provide more information for the development of effective inactivated vaccines and drugs for PRV.
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Affiliation(s)
- Guangqiang Ye
- State Key Laboratory of Veterinary Biotechnology, Division of Fundamental Immunology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin 150069, China; (G.Y.); (H.L.); (Q.Z.); (X.L.); (L.H.)
| | - Hongyang Liu
- State Key Laboratory of Veterinary Biotechnology, Division of Fundamental Immunology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin 150069, China; (G.Y.); (H.L.); (Q.Z.); (X.L.); (L.H.)
| | - Qiongqiong Zhou
- State Key Laboratory of Veterinary Biotechnology, Division of Fundamental Immunology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin 150069, China; (G.Y.); (H.L.); (Q.Z.); (X.L.); (L.H.)
| | - Xiaohong Liu
- State Key Laboratory of Veterinary Biotechnology, Division of Fundamental Immunology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin 150069, China; (G.Y.); (H.L.); (Q.Z.); (X.L.); (L.H.)
| | - Li Huang
- State Key Laboratory of Veterinary Biotechnology, Division of Fundamental Immunology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin 150069, China; (G.Y.); (H.L.); (Q.Z.); (X.L.); (L.H.)
- Heilongjiang Provincial Key Laboratory of Veterinary Immunology, Harbin 150069, China
| | - Changjiang Weng
- State Key Laboratory of Veterinary Biotechnology, Division of Fundamental Immunology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin 150069, China; (G.Y.); (H.L.); (Q.Z.); (X.L.); (L.H.)
- Heilongjiang Provincial Key Laboratory of Veterinary Immunology, Harbin 150069, China
- Correspondence:
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Li Z, Cai S, Sun Y, Li L, Ding S, Wang X. When STING Meets Viruses: Sensing, Trafficking and Response. Front Immunol 2020; 11:2064. [PMID: 33133062 PMCID: PMC7550420 DOI: 10.3389/fimmu.2020.02064] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 07/29/2020] [Indexed: 12/19/2022] Open
Abstract
To effectively defend against microbial pathogens, the host cells mount antiviral innate immune responses by producing interferons (IFNs), and hundreds of IFN-stimulated genes (ISGs). Upon recognition of cytoplasmic viral or bacterial DNAs and abnormal endogenous DNAs, the DNA sensor cGAS synthesizes 2',3'-cGAMP that induces STING (stimulator of interferon genes) undergoing conformational changes, cellular trafficking, and the activation of downstream factors. Therefore, STING plays a pivotal role in preventing microbial pathogen infection by sensing DNAs during pathogen invasion. This review is dedicated to the recent advances in the dynamic regulations of STING activation, intracellular trafficking, and post-translational modifications (PTMs) by the host and microbial proteins.
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Affiliation(s)
- Zhaohe Li
- Key Laboratory of Marine Drugs of Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Siqi Cai
- Key Laboratory of Marine Drugs of Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Yutong Sun
- Key Laboratory of Marine Drugs of Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Li Li
- Key Laboratory of Marine Drugs of Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China.,Center for Innovation Marine Drug Screening and Evaluation, Pilot National Laboratory for Marine Science and Technology, Qingdao, China.,Marine Biomedical Research Institute of Qingdao, Qingdao, China
| | - Siyuan Ding
- Department of Molecular Microbiology, School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
| | - Xin Wang
- Key Laboratory of Marine Drugs of Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China.,Center for Innovation Marine Drug Screening and Evaluation, Pilot National Laboratory for Marine Science and Technology, Qingdao, China.,Marine Biomedical Research Institute of Qingdao, Qingdao, China
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Nukui M, Roche KL, Jia J, Fox PL, Murphy EA. Protein S-Nitrosylation of Human Cytomegalovirus pp71 Inhibits Its Ability To Limit STING Antiviral Responses. J Virol 2020; 94:e00033-20. [PMID: 32581105 DOI: 10.1128/JVI.00033-20] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 06/18/2020] [Indexed: 12/31/2022] Open
Abstract
Human Cytomegalovirus (HCMV) is a ubiquitous pathogen that has coevolved with its host and, in doing so, is highly efficient in undermining antiviral responses that limit successful infections. As a result, HCMV infections are highly problematic in individuals with weakened or underdeveloped immune systems, including transplant recipients and newborns. Understanding how HCMV controls the microenvironment of an infected cell so as to favor productive replication is of critical importance. To this end, we took an unbiased proteomics approach to identify the highly reversible, stress-induced, posttranslational modification (PTM) protein S-nitrosylation on viral proteins to determine the biological impact on viral replication. We identified protein S-nitrosylation of 13 viral proteins during infection of highly permissive fibroblasts. One of these proteins, pp71, is critical for efficient viral replication, as it undermines host antiviral responses, including stimulator of interferon genes (STING) activation. By exploiting site-directed mutagenesis of the specific amino acids we identified in pp71 as protein S-nitrosylated, we found this pp71 PTM diminishes its ability to undermine antiviral responses induced by the STING pathway. Our results suggest a model in which protein S-nitrosylation may function as a host response to viral infection that limits viral spread.IMPORTANCE In order for a pathogen to establish a successful infection, it must undermine the host cell responses inhibitory to the pathogen. As such, herpesviruses encode multiple viral proteins that antagonize each host antiviral response, thereby allowing for efficient viral replication. Human Cytomegalovirus encodes several factors that limit host countermeasures to infection, including pp71. Herein, we identified a previously unreported posttranslational modification of pp71, protein S-nitrosylation. Using site-directed mutagenesis, we mutated the specific sites of this modification thereby blocking this pp71 posttranslational modification. In contexts where pp71 is not protein S-nitrosylated, host antiviral response was inhibited. The net result of this posttranslational modification is to render a viral protein with diminished abilities to block host responses to infection. This novel work supports a model in which protein S-nitrosylation may be an additional mechanism in which a cell inhibits a pathogen during the course of infection.
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Sun Y, Cheng Y. STING or Sting: cGAS-STING-Mediated Immune Response to Protozoan Parasites. Trends Parasitol 2020; 36:773-784. [PMID: 32736985 DOI: 10.1016/j.pt.2020.07.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 06/18/2020] [Accepted: 07/01/2020] [Indexed: 02/06/2023]
Abstract
Emerging evidence suggests that the DNA-sensing pathway plays a crucial role in innate immunity against multiple diseases, especially infectious diseases. Cyclic GMP-AMP synthase (cGAS), as a DNA sensor, and stimulator of interferon (IFN) genes (STING), as an adaptor protein, are the central components that link DNA sensing to immunologic functions - including, but not limited to, the type I IFN response. Recently, a series of studies have revealed that genomic DNA from protozoan parasites triggers the cGAS-STING pathway, and these studies identified the positive and negative regulators that modulate the signaling in parasite infection. Here, we summarize current understanding of the critical functions and potential applications of the cGAS-STING axis in parasitic diseases, specifically those caused by malaria parasites.
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Affiliation(s)
- Yifan Sun
- Laboratory of Pathogen Infection and Immunity, Department of Public Health and Preventive Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi 214122, Jiangsu, People's Republic of China
| | - Yang Cheng
- Laboratory of Pathogen Infection and Immunity, Department of Public Health and Preventive Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi 214122, Jiangsu, People's Republic of China.
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Latif MB, Raja R, Kessler PM, Sen GC. Relative Contributions of the cGAS-STING and TLR3 Signaling Pathways to Attenuation of Herpes Simplex Virus 1 Replication. J Virol 2020; 94:e01717-19. [PMID: 31896590 DOI: 10.1128/JVI.01717-19] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 12/18/2019] [Indexed: 12/27/2022] Open
Abstract
The innate immune response is crucial for defense against viral infections. Cells recognize virus infection through pattern recognition receptors and induce type I interferons as well as proinflammatory cytokines to orchestrate an innate immune response. Herpes simplex virus 1 (HSV-1) triggers both the cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) and Toll-like receptor 3 (TLR3) pathways. It is well known that TLR3 uses the adaptor protein Toll/interleukin-1 receptor (IL-1R) domain-containing adaptor-inducing beta interferon (TRIF) for signaling, but we recently reported that STING signaling also requires TRIF. Because STING directly binds to TRIF, we identified the STING-interacting domain of TRIF and generated STING-noninteracting mutants of human and mouse TRIFs. The mutant TRIFs were unable to support STING signaling, although they were fully functional in the TLR3 pathway. These mutants were used to assess the relative contributions of the TLR3 and STING pathways to the attenuation of HSV-1 replication in mouse and human cell lines. For this purpose, the mouse L929 and NB41A3 cell lines and the human HT1080 and HeLa-M cell lines, in which both the TLR3 and the STING pathways are operational, were used. The TRIF gene was disrupted in these lines by CRISPR/Cas9, before reconstituting them with mutant and wild-type TRIF expression vectors. Infection of the reconstituted cells with HSV-1 revealed that both the cGAS-STING and the TLR3 signaling pathways are required for the attenuation of virus replication, but their relative contributions in attenuating HSV-1 replication were found to be different in mouse versus human cell lines. Thus, our study suggests that the relative contributions of the cGAS-STING and the TLR3 pathways in the attenuation of viral infection may be species specific.IMPORTANCE The magnitude of fatal infections caused by all different viruses in human and animal populations justifies a better understanding of the host innate immune response process that attenuates virus replication. In particular, the relative contributions of different signaling pathways which are responsible for the generation of the innate immune response are still largely unknown. In this study, we used STING-noninteracting TRIF mutants to decipher the relative contributions of the TLR3 and cGAS-STING signaling pathways to the attenuation of HSV-1 infection. We show that the relative contributions of the two pathways to the attenuation of viral infection are different in mouse versus human cell lines. Together, our results provide new insights into the relative contributions of two different signaling pathways in the attenuation of viral infection and may lead to the development of new antiviral strategies aimed at blocking viral infection at very early stages.
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Gall B, Pryke K, Abraham J, Mizuno N, Botto S, Sali TM, Broeckel R, Haese N, Nilsen A, Placzek A, Morrison T, Heise M, Streblow D, DeFilippis V. Emerging Alphaviruses Are Sensitive to Cellular States Induced by a Novel Small-Molecule Agonist of the STING Pathway. J Virol 2018; 92:e01913-17. [PMID: 29263267 PMCID: PMC5827377 DOI: 10.1128/jvi.01913-17] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 12/12/2017] [Indexed: 01/23/2023] Open
Abstract
The type I interferon (IFN) system represents an essential innate immune response that renders cells resistant to virus growth via the molecular actions of IFN-induced effector proteins. IFN-mediated cellular states inhibit growth of numerous and diverse virus types, including those of known pathogenicity as well as potentially emerging agents. As such, targeted pharmacologic activation of the IFN response may represent a novel therapeutic strategy to prevent infection or spread of clinically impactful viruses. In light of this, we employed a high-throughput screen to identify small molecules capable of permeating the cell and of activating IFN-dependent signaling processes. Here we report the identification and characterization of N-(methylcarbamoyl)-2-{[5-(4-methylphenyl)-1,3,4-oxadiazol-2-yl]sulfanyl}-2-phenylacetamide (referred to as C11), a novel compound capable of inducing IFN secretion from human cells. Using reverse genetics-based loss-of-function assays, we show that C11 activates the type I IFN response in a manner that requires the adaptor protein STING but not the alternative adaptors MAVS and TRIF. Importantly, treatment of cells with C11 generated a cellular state that potently blocked replication of multiple emerging alphavirus types, including chikungunya, Ross River, Venezuelan equine encephalitis, Mayaro, and O'nyong-nyong viruses. The antiviral effects of C11 were subsequently abrogated in cells lacking STING or the type I IFN receptor, indicating that they are mediated, at least predominantly, by way of STING-mediated IFN secretion and subsequent autocrine/paracrine signaling. This work also allowed characterization of differential antiviral roles of innate immune signaling adaptors and IFN-mediated responses and identified MAVS as being crucial to cellular resistance to alphavirus infection.IMPORTANCE Due to the increase in emerging arthropod-borne viruses, such as chikungunya virus, that lack FDA-approved therapeutics and vaccines, it is important to better understand the signaling pathways that lead to clearance of virus. Here we show that C11 treatment makes human cells refractory to replication of a number of these viruses, which supports its value in increasing our understanding of the immune response and viral pathogenesis required to establish host infection. We also show that C11 depends on signaling through STING to produce antiviral type I interferon, which further supports its potential as a therapeutic drug or research tool.
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Affiliation(s)
- Bryan Gall
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Kara Pryke
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Jinu Abraham
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Nobuyo Mizuno
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Sara Botto
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Tina M Sali
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Rebecca Broeckel
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Nicole Haese
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Aaron Nilsen
- Veterans Affairs Medical Center, Portland, Oregon, USA
| | | | - Thomas Morrison
- Department of Immunology and Microbiology, School of Medicine, University of Colorado, Aurora, Colorado, USA
| | - Mark Heise
- Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Daniel Streblow
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Victor DeFilippis
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, Oregon, USA
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Zhang Y, Zhu M, Li G, Liu J, Zhai X, Wang R, Zhang J, Xing G, Gu J, Yan L, Lei J, Sun H, Shi Z, Liu F, Hu B, Su S, Zhou J. Identification and function analysis of canine stimulator of interferon gene (STING). Microb Pathog 2017; 113:202-8. [PMID: 29074428 DOI: 10.1016/j.micpath.2017.10.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 10/20/2017] [Accepted: 10/23/2017] [Indexed: 01/14/2023]
Abstract
Stimulator of interferon gene (STING) plays an important role in the cyclic GMP-AMP synthase (cGAS)-mediated activation of type I IFN responses. In this study, we identified and cloned canine STING gene. Full-length STING encodes a 375 amino acid product that shares the highest similarity with feline STING. Highest levels of mRNA of canine STING were detected in the spleen and lungs while the lowest levels in the heart and muscle. Analysis of its cellular localization showed that STING is localizes to the endoplasmic reticulum. STING overexpression induced the IFN response via the IRF3 and NF-κB pathways and up-regulated the expression of ISG15 and viperin. However, knockdown of STING did not inhibit the IFN-β response triggered by poly(dA:dT), poly(I:C), or SeV. Finally, overexpression of STING significantly inhibited the replication of canine influenza virus H3N2. Collectively, our findings indicate that STING is involved in the regulation of the IFN-β pathway in canine. Here we first identified and cloned canine STING gene. STING overexpression induced the IFN response via the IRF3 and NF-kB pathways. Overexpression of STING inhibited the replication of H3N2 CIV.
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