1
|
Pashazadeh Azari P, Rezaei Zadeh Rukerd M, Charostad J, Bashash D, Farsiu N, Behzadi S, Mahdieh Khoshnazar S, Heydari S, Nakhaie M. Monkeypox (Mpox) vs. Innate immune responses: Insights into evasion mechanisms and potential therapeutic strategies. Cytokine 2024; 183:156751. [PMID: 39244831 DOI: 10.1016/j.cyto.2024.156751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2024] [Revised: 08/16/2024] [Accepted: 09/04/2024] [Indexed: 09/10/2024]
Abstract
Orthopoxviruses, a group of zoonotic viral infections, have emerged as a significant health emergency and global concern, particularly exemplified by the re-emergence of monkeypox (Mpox). Effectively addressing these viral infections necessitates a comprehensive understanding of the intricate interplay between the viruses and the host's immune response. In this review, we aim to elucidate the multifaceted aspects of innate immunity in the context of orthopoxviruses, with a specific focus on monkeypox virus (MPXV). We provide an in-depth analysis of the roles of key innate immune cells, including natural killer (NK) cells, dendritic cells (DCs), and granulocytes, in the host defense against MPXV. Furthermore, we explore the interferon (IFN) response, highlighting the involvement of toll-like receptors (TLRs) and cytosolic DNA/RNA sensors in detecting and responding to the viral presence. This review also examines the complement system's contribution to the immune response and provides a detailed analysis of the immune evasion strategies employed by MPXV to evade host defenses. Additionally, we discuss current prevention and treatment strategies for Mpox, including pre-exposure (PrEP) and post-exposure (PoEP) prophylaxis, supportive treatments, antivirals, and vaccinia immune globulin (VIG).
Collapse
Affiliation(s)
- Pouya Pashazadeh Azari
- Department of Immunology, Faculty of Medicine, Kerman University of Medical Science, Kerman, Iran
| | - Mohammad Rezaei Zadeh Rukerd
- Gastroenterology and Hepatology Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran
| | - Javad Charostad
- Department of Microbiology, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Davood Bashash
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Niloofar Farsiu
- Gastroenterology and Hepatology Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran
| | - Saleh Behzadi
- Student Research Committee, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - Seyedeh Mahdieh Khoshnazar
- Gastroenterology and Hepatology Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran
| | - Sajjad Heydari
- Department of Immunology, Faculty of Medicine, Kerman University of Medical Science, Kerman, Iran
| | - Mohsen Nakhaie
- Gastroenterology and Hepatology Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran; Clinical Research Development Unit, Afzalipour Hospital, Kerman University of Medical Sciences, Kerman, Iran.
| |
Collapse
|
2
|
Hazlewood JE, Dumenil T, Le TT, Slonchak A, Kazakoff SH, Patch AM, Gray LA, Howley PM, Liu L, Hayball JD, Yan K, Rawle DJ, Prow NA, Suhrbier A. Injection site vaccinology of a recombinant vaccinia-based vector reveals diverse innate immune signatures. PLoS Pathog 2021; 17:e1009215. [PMID: 33439897 PMCID: PMC7837487 DOI: 10.1371/journal.ppat.1009215] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 01/26/2021] [Accepted: 12/04/2020] [Indexed: 02/07/2023] Open
Abstract
Poxvirus systems have been extensively used as vaccine vectors. Herein a RNA-Seq analysis of intramuscular injection sites provided detailed insights into host innate immune responses, as well as expression of vector and recombinant immunogen genes, after vaccination with a new multiplication defective, vaccinia-based vector, Sementis Copenhagen Vector. Chikungunya and Zika virus immunogen mRNA and protein expression was associated with necrosing skeletal muscle cells surrounded by mixed cellular infiltrates. The multiple adjuvant signatures at 12 hours post-vaccination were dominated by TLR3, 4 and 9, STING, MAVS, PKR and the inflammasome. Th1 cytokine signatures were dominated by IFNγ, TNF and IL1β, and chemokine signatures by CCL5 and CXCL12. Multiple signatures associated with dendritic cell stimulation were evident. By day seven, vaccine transcripts were absent, and cell death, neutrophil, macrophage and inflammation annotations had abated. No compelling arthritis signatures were identified. Such injection site vaccinology approaches should inform refinements in poxvirus-based vector design. Poxvirus vector systems have been widely developed for vaccine applications. Despite considerable progress, so far only one recombinant poxvirus vectored vaccine has to date been licensed for human use, with ongoing efforts seeking to enhance immunogenicity whilst minimizing reactogenicity. The latter two characteristics are often determined by early post-vaccination events at the injection site. We therefore undertook an injection site vaccinology approach to analyzing gene expression at the vaccination site after intramuscular inoculation with a recombinant, multiplication defective, vaccinia-based vaccine. This provided detailed insights into inter alia expression of vector-encoded immunoregulatory genes, as well as host innate and adaptive immune responses. We propose that such injection site vaccinology can inform rational vaccine vector design, and we discuss how the information and approach elucidated herein might be used to improve immunogenicity and limit reactogenicity of poxvirus-based vaccine vector systems.
Collapse
Affiliation(s)
- Jessamine E. Hazlewood
- Inflammation Biology Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Troy Dumenil
- Inflammation Biology Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Thuy T. Le
- Inflammation Biology Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Andrii Slonchak
- School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Australia
| | - Stephen H. Kazakoff
- Clinical Genomics, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Ann-Marie Patch
- Clinical Genomics, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Lesley-Ann Gray
- Australian Genome Research Facility Ltd., Melbourne, Australia
| | | | - Liang Liu
- Experimental Therapeutics Laboratory, University of South Australia Cancer Research Institute, Clinical and Health Sciences, University of South Australia, Adelaide, Australia
| | - John D. Hayball
- Sementis Ltd., Hackney, Australia
- Experimental Therapeutics Laboratory, University of South Australia Cancer Research Institute, Clinical and Health Sciences, University of South Australia, Adelaide, Australia
| | - Kexin Yan
- Inflammation Biology Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Daniel J. Rawle
- Inflammation Biology Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Natalie A. Prow
- Inflammation Biology Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia
- Experimental Therapeutics Laboratory, University of South Australia Cancer Research Institute, Clinical and Health Sciences, University of South Australia, Adelaide, Australia
| | - Andreas Suhrbier
- Inflammation Biology Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia
- Australian Infectious Disease Research Centre, Brisbane, Australia
- * E-mail:
| |
Collapse
|
3
|
Lu Y, Zhang L. DNA-Sensing Antiviral Innate Immunity in Poxvirus Infection. Front Immunol 2020; 11:1637. [PMID: 32983084 PMCID: PMC7483915 DOI: 10.3389/fimmu.2020.01637] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 06/18/2020] [Indexed: 12/16/2022] Open
Abstract
As pattern recognition receptors, cytosolic DNA sensors quickly induce an effective innate immune response. Poxvirus, a large DNA virus, is capable of evading the host antiviral innate immune response. In this review, we summarize the latest studies on how poxvirus is sensed by the host innate immune system and how poxvirus-encoded proteins antagonize DNA sensors. A comprehensive understanding of the interplay between poxvirus and DNA-sensing antiviral immune responses of the host will contribute to the development of new antiviral therapies and vaccines in the future.
Collapse
Affiliation(s)
- Yue Lu
- Department of Laboratory Medicine, The First Affiliated Hospital of Shandong First Medical University, Jinan, China.,Institute of Basic Medicine, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China.,Key Laboratory for Biotech-Drugs of National Health Commission, Jinan, China.,Key Laboratory for Rare and Uncommon Diseases of Shandong Province, Jinan, China
| | - Leiliang Zhang
- Department of Laboratory Medicine, The First Affiliated Hospital of Shandong First Medical University, Jinan, China.,Institute of Basic Medicine, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China.,Key Laboratory for Biotech-Drugs of National Health Commission, Jinan, China.,Key Laboratory for Rare and Uncommon Diseases of Shandong Province, Jinan, China.,Science and Technology Innovation Center, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| |
Collapse
|
4
|
Stotesbury C, Wong EB, Tang L, Montoya B, Knudson CJ, Melo‐Silva CR, Sigal LJ. Defective early innate immune response to ectromelia virus in the draining lymph nodes of aged mice due to impaired dendritic cell accumulation. Aging Cell 2020; 19:e13170. [PMID: 32657004 PMCID: PMC7433008 DOI: 10.1111/acel.13170] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 04/11/2020] [Accepted: 05/13/2020] [Indexed: 12/14/2022] Open
Abstract
It is known that aging decreases natural resistance to viral diseases due to dysfunctional innate and adaptive immune responses, but the nature of these dysfunctions, particularly in regard to innate immunity, is not well understood. We have previously shown that C57BL/6J (B6) mice lose their natural resistance to footpad infection with ectromelia virus (ECTV) due to impaired maturation and recruitment of natural killer (NK) cells to the draining popliteal lymph node (dLN). More recently, we have also shown that in young B6 mice infected with ECTV, the recruitment of NK cells is dependent on a complex cascade whereby migratory dendritic cells (mDCs) traffic from the skin to the dLN, where they produce CCL2 and CCL7 to recruit inflammatory monocytes (iMOs). In the dLN, mDCs also upregulate NKG2D ligands to induce interferon gamma (IFN-γ) expression by group 1 innate lymphoid cells (G1-ILCs), mostly NK in cells but also some ILC1. In response to the IFN-γ, the incoming uninfected iMOs secret CXCL9 to recruit the critical NK cells. Here, we show that in aged B6 mice, the trafficking of mDCs to the dLN in response to ECTV is decreased, resulting in impaired IFN-γ expression by G1-ILCs, reduced accumulation of iMOs, and attenuated CXCL9 production by iMOs, which likely contributes to decrease in NK cell recruitment. Together, these data indicate that defects in the mDC response to viral infection during aging result in a reduced innate immune response in the dLN and contribute to increased susceptibility to viral disease in the aged.
Collapse
Affiliation(s)
- Colby Stotesbury
- Department of Microbiology and Immunology Thomas Jefferson University Philadelphia PA USA
| | - Eric B. Wong
- Department of Microbiology and Immunology Thomas Jefferson University Philadelphia PA USA
| | - Lingjuan Tang
- Department of Microbiology and Immunology Thomas Jefferson University Philadelphia PA USA
| | - Brian Montoya
- Department of Microbiology and Immunology Thomas Jefferson University Philadelphia PA USA
| | - Cory J. Knudson
- Department of Microbiology and Immunology Thomas Jefferson University Philadelphia PA USA
| | - Carolina R. Melo‐Silva
- Department of Microbiology and Immunology Thomas Jefferson University Philadelphia PA USA
| | - Luis J. Sigal
- Department of Microbiology and Immunology Thomas Jefferson University Philadelphia PA USA
| |
Collapse
|
5
|
Wong E, Xu RH, Rubio D, Lev A, Stotesbury C, Fang M, Sigal LJ. Migratory Dendritic Cells, Group 1 Innate Lymphoid Cells, and Inflammatory Monocytes Collaborate to Recruit NK Cells to the Virus-Infected Lymph Node. Cell Rep 2019; 24:142-154. [PMID: 29972776 DOI: 10.1016/j.celrep.2018.06.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 04/30/2018] [Accepted: 06/01/2018] [Indexed: 11/17/2022] Open
Abstract
Circulating natural killer (NK) cells help protect the host from lympho-hematogenous acute viral diseases by rapidly entering draining lymph nodes (dLNs) to curb virus dissemination. Here, we identify a highly choreographed mechanism underlying this process. Using footpad infection with ectromelia virus, a pathogenic DNA virus of mice, we show that TLR9/MyD88 sensing induces NKG2D ligands in virus-infected, skin-derived migratory dendritic cells (mDCs) to induce production of IFN-γ by classical NK cells and other types of group 1 innate lymphoid cells (ILCs) already in dLNs, via NKG2D. Uninfected inflammatory monocytes, also recruited to dLNs by mDCs in a TLR9/MyD88-dependent manner, respond to IFN-γ by secreting CXCL9 for optimal CXCR3-dependent recruitment of circulating NK cells. This work unveils a TLR9/MyD88-dependent mechanism whereby in dLNs, three cell types-mDCs, group 1 ILCs (mostly NK cells), and inflammatory monocytes-coordinate the recruitment of protective circulating NK cells to dLNs.
Collapse
Affiliation(s)
- Eric Wong
- Department of Microbiology and Immunology, Thomas Jefferson University, BLSB 709, 233 South 10(th) Street, Philadelphia, PA 19107, USA
| | - Ren-Huan Xu
- Immune Cell Development and Host Defense Program, Research Institute of Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111, USA
| | - Daniel Rubio
- Immune Cell Development and Host Defense Program, Research Institute of Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111, USA
| | - Avital Lev
- Immune Cell Development and Host Defense Program, Research Institute of Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111, USA
| | - Colby Stotesbury
- Department of Microbiology and Immunology, Thomas Jefferson University, BLSB 709, 233 South 10(th) Street, Philadelphia, PA 19107, USA
| | - Min Fang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, 100101, China
| | - Luis J Sigal
- Department of Microbiology and Immunology, Thomas Jefferson University, BLSB 709, 233 South 10(th) Street, Philadelphia, PA 19107, USA.
| |
Collapse
|
6
|
Cheng WY, He XB, Jia HJ, Chen GH, Jin QW, Long ZL, Jing ZZ. The cGas-Sting Signaling Pathway Is Required for the Innate Immune Response Against Ectromelia Virus. Front Immunol 2018; 9:1297. [PMID: 29963044 PMCID: PMC6010520 DOI: 10.3389/fimmu.2018.01297] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 05/24/2018] [Indexed: 12/11/2022] Open
Abstract
Activation of the DNA-dependent innate immune pathway plays a pivotal role in the host defense against poxvirus. Cyclic GMP-AMP synthase (cGAS) is a key cytosolic DNA sensor that produces the cyclic dinucleotide cGMP-AMP (cGAMP) upon activation, which triggers stimulator of interferon genes (STING), leading to type I Interferons (IFNs) production and an antiviral response. Ectromelia virus (ECTV) has emerged as a valuable model for investigating the host-Orthopoxvirus relationship. However, the role of cGas-Sting pathway in response to ECTV is not clearly understood. Here, we showed that murine cells (L929 and RAW264.7) mount type I IFN responses to ECTV that are dependent upon cGas, Sting, TANK binding kinase 1 (Tbk1), and interferon regulatory factor 3 (Irf3) signaling. Disruption of cGas or Sting expression in mouse macrophages blocked the type I IFN production and facilitated ECTV replication. Consistently, mice deficient in cGas or Sting exhibited lower type I IFN levels and higher viral loads, and are more susceptible to mousepox. Collectively, our study indicates that the cGas-Sting pathway is critical for sensing of ECTV infection, inducing the type I IFN production, and controlling ECTV replication.
Collapse
Affiliation(s)
- Wen-Yu Cheng
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Xiao-Bing He
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Huai-Jie Jia
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Guo-Hua Chen
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Qi-Wang Jin
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Zhao-Lin Long
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Zhi-Zhong Jing
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| |
Collapse
|
7
|
Sequential Activation of Two Pathogen-Sensing Pathways Required for Type I Interferon Expression and Resistance to an Acute DNA Virus Infection. Immunity 2016; 43:1148-59. [PMID: 26682986 DOI: 10.1016/j.immuni.2015.11.015] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 06/29/2015] [Accepted: 11/19/2015] [Indexed: 01/14/2023]
Abstract
Toll-like receptor 9 (TLR9), its adaptor MyD88, the downstream transcription factor interferon regulatory factor 7 (IRF7), and type I interferons (IFN-I) are all required for resistance to infection with ectromelia virus (ECTV). However, it is not known how or in which cells these effectors function to promote survival. Here, we showed that after infection with ECTV, the TLR9-MyD88-IRF7 pathway was necessary in CD11c(+) cells for the expression of proinflammatory cytokines and the recruitment of inflammatory monocytes (iMos) to the draining lymph node (dLN). In the dLN, the major producers of IFN-I were infected iMos, which used the DNA sensor-adaptor STING to activate IRF7 and nuclear factor κB (NF-κB) signaling to induce the expression of IFN-α and IFN-β, respectively. Thus, in vivo, two pathways of DNA pathogen sensing act sequentially in two distinct cell types to orchestrate resistance to a viral disease.
Collapse
|
8
|
Abstract
Ectromelia virus is a mouse-specific orthopoxvirus that, following footpad infection or natural transmission, causes mousepox in most strains of mice, while a few strains, such as C57BL/6, are resistant to the disease but not to the infection. Mousepox is an acute, systemic, highly lethal disease of remarkable semblance to smallpox, caused by the human-specific variola virus. Starting in 1929 with its discovery by Marchal, work with ECTV has provided essential information for our current understanding on how viruses spread lympho-hematogenously, the genetic control of antiviral resistance, the role of different components of the innate and adaptive immune system in the control of primary and secondary infections with acute viruses, and how the mechanisms of immune evasion deployed by the virus affect virulence in vivo. Here, I review the literature on the pathogenesis and immunobiology of ECTV infection in vivo.
Collapse
Affiliation(s)
- Luis J Sigal
- Thomas Jefferson University, Department of Microbiology and Immunology, Philadelphia, Pennsylvania, USA.
| |
Collapse
|
9
|
von Buttlar H, Siegemund S, Büttner M, Alber G. Identification of Toll-like receptor 9 as parapoxvirus ovis-sensing receptor in plasmacytoid dendritic cells. PLoS One 2014; 9:e106188. [PMID: 25171368 PMCID: PMC4149514 DOI: 10.1371/journal.pone.0106188] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 08/01/2014] [Indexed: 12/23/2022] Open
Abstract
Parapoxvirus ovis (PPVO) is known for its immunostimulatory capacities and has been successfully used to generate vector vaccines effective especially in non-permissive host species. Murine conventional and plasmacytoid dendritic cells (cDC and pDC) are able to recognize PPVO. The PPVO-sensing receptor on pDC is hitherto unknown. In this study we aimed to define the pattern recognition receptor responsible for the activation of murine pDC by inactivated and replication-competent PPVO. We show that PPVO-induced expression of type I and type III interferons, pro-inflammatory cytokines, and co-stimulatory CD86 by bone marrow-derived pDC but not cDC is blocked by chloroquine, an inhibitor of endosomal maturation. The activation of pDC is independent of viral replication and depends mainly on TLR9. Moreover, the use of phosphatidylinositol 3-kinase inhibitor wortmannin or C-Jun-N-terminal kinase inhibitor SP600125 results in significant reduction of PPVO-induced pDC activation. Taken together, our data identify endosomal TLR9 as PPVO-sensing receptor in pDC.
Collapse
Affiliation(s)
- Heiner von Buttlar
- Institute of Immunology, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Sabine Siegemund
- Institute of Immunology, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Mathias Büttner
- Bavarian Health and Food Safety Authority, Oberschleissheim, Germany
| | - Gottfried Alber
- Institute of Immunology, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
- * E-mail:
| |
Collapse
|
10
|
MyD88-dependent immunity to a natural model of vaccinia virus infection does not involve Toll-like receptor 2. J Virol 2014; 88:3557-67. [PMID: 24403581 DOI: 10.1128/jvi.02776-13] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED Although the pattern recognition receptor Toll-like receptor 2 (TLR2) is typically thought to recognize bacterial components, it has been described to alter the induction of both innate and adaptive immunity to a number of viruses, including vaccinia virus (VACV). However, many pathogens that reportedly encode TLR2 agonists may actually be artifactually contaminated during preparation, possibly with cellular debris or merely with molecules that sensitize cells to be activated by authentic TLR2 agonists. In both humans and mice, the most relevant natural route of infection with VACV is through intradermal infection of the skin. Therefore, we examined the requirement for TLR2 and its signaling adaptor MyD88 in protective immunity to VACV after intradermal infection. We find that although TLR2 may recognize virus preparations in vitro and have a minor role in preventing dissemination of VACV following systemic infection with large doses of virus, it is wholly disposable in both control of virus replication and induction of adaptive immunity following intradermal infection. In contrast, MyD88 is required for efficient induction of CD4 T cell and B cell responses and for local control of virus replication following intradermal infection. However, even MyD88 is not required to induce local inflammation, inflammatory cytokine production, or recruitment of cells that restrict virus from spreading systemically after peripheral infection. Thus, an effective antiviral response does require MyD88, but TLR2 is not required for control of a peripheral VACV infection. These findings emphasize the importance of studying relevant routes of infection when examining innate sensing mechanisms. IMPORTANCE Vaccinia virus (VACV) provides the backbone for some of the most widely used and successful viral vaccine vectors and is also related to the human pathogens Cantagalo virus and molluscum contagiosum virus that infect the skin of patients. Therefore, it is vital to understand the mechanisms that induce a strong innate immune response to the virus following dermal infection. Here, we compare the ability of the innate sensing molecule Toll-like receptor 2 (TLR2) and the signaling molecule MyD88 to influence the innate and adaptive immune response to VACV following systemic or dermal infection.
Collapse
|
11
|
Rubio D, Xu RH, Remakus S, Krouse TE, Truckenmiller ME, Thapa RJ, Balachandran S, Alcamí A, Norbury CC, Sigal LJ. Crosstalk between the type 1 interferon and nuclear factor kappa B pathways confers resistance to a lethal virus infection. Cell Host Microbe 2013; 13:701-10. [PMID: 23768494 DOI: 10.1016/j.chom.2013.04.015] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 02/28/2013] [Accepted: 04/08/2013] [Indexed: 01/09/2023]
Abstract
Nuclear factor kappa B (NF-κB) and type 1 interferon (T1-IFN) signaling are innate immune mechanisms activated upon viral infection. However, the role of NF-κB and its interplay with T1-IFN in antiviral immunity is poorly understood. We show that NF-κB is essential for resistance to ectromelia virus (ECTV), a mouse orthopoxvirus related to the virus causing human smallpox. Additionally, an ECTV mutant lacking an NF-κB inhibitor activates NF-κB more effectively in vivo, resulting in increased proinflammatory molecule transcription in uninfected cells and organs and decreased viral replication. Unexpectedly, NF-κB activation compensates for genetic defects in the T1-IFN pathway, such as a deficiency in the IRF7 transcription factor, resulting in virus control. Thus, overlap between the T1-IFN and NF-κB pathways allows the host to overcome genetic or pathogen-induced deficiencies in T1-IFN and survive an otherwise lethal poxvirus infection. These findings may also explain why some pathogens target both pathways to cause disease.
Collapse
Affiliation(s)
- Daniel Rubio
- Immune Cell Development and Host Defense Program, Research Institute of Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Toll-like receptors in antiviral innate immunity. J Mol Biol 2013; 426:1246-64. [PMID: 24316048 PMCID: PMC3943763 DOI: 10.1016/j.jmb.2013.11.024] [Citation(s) in RCA: 509] [Impact Index Per Article: 46.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 11/22/2013] [Accepted: 11/26/2013] [Indexed: 12/26/2022]
Abstract
Toll-like receptors (TLRs) are fundamental sensor molecules of the host innate immune system, which detect conserved molecular signatures of a wide range of microbial pathogens and initiate innate immune responses via distinct signaling pathways. Various TLRs are implicated in the early interplay of host cells with invading viruses, which regulates viral replication and/or host responses, ultimately impacting on viral pathogenesis. To survive the host innate defense mechanisms, many viruses have developed strategies to evade or counteract signaling through the TLR pathways, creating an advantageous environment for their propagation. Here we review the current knowledge of the roles TLRs play in antiviral innate immune responses, discuss examples of TLR-mediated viral recognition, and describe strategies used by viruses to antagonize the host antiviral innate immune responses. TLRs are membrane-bound sensors that activate innate immune responses to viruses. TLRs recognize viral proteins on cell surface or viral nucleic acids in endosomes. TLRs employ distinct pathways to induce interferon (IFN) antiviral and/or inflammatory responses. Viruses have evolved elaborate tactics to circumvent TLR-mediated innate immunity. TLRs regulate viral pathogenesis and are amenable to therapeutic purposes.
Collapse
|
13
|
Abstract
In recent years, our understanding of the role of natural killer (NK) cells in the response to viral infection has grown rapidly. Not only do we realize viruses have many immune-evasion strategies to escape NK cell responses, but that stimulation of NK cell subsets during an antiviral response occurs through receptors seemingly geared directly at viral products and that NK cells can provide a memory response to viral pathogens. Tremendous knowledge has been gained in this area through the study of herpes viruses, but appreciation for the significance of NK cells in the response to other types of viral infections is growing. The function of NK cells in defense against poxviruses has emerged over several decades beginning with the early seminal studies showing the role of NK cells and the NK gene complex in susceptibility of mouse strains to ectromelia, a poxvirus pathogen of mice. More recently, greater understanding has emerged of the molecular details of the response. Given that human diseases caused by poxviruses can be as lethal as smallpox or as benign as Molluscum contagiosum, and that vaccinia virus, the prototypic member of the pox family, persists as a mainstay of vaccine design and has potential as an oncolytic virus for tumor therapy, further research in this area remains important. This review focuses on recent advances in understanding the role of NK cells in the immune response to poxviruses, the receptors involved in activation of NK cells during poxvirus infection, and the viral evasion strategies poxviruses employ to avoid the NK response.
Collapse
Affiliation(s)
- Deborah N Burshtyn
- Department of Microbiology and Immunology, University of Alberta Edmonton, AB, Canada
| |
Collapse
|
14
|
Lousberg EL, Diener KR, Brown MP, Hayball JD. Innate immune recognition of poxviral vaccine vectors. Expert Rev Vaccines 2012; 10:1435-49. [PMID: 21988308 DOI: 10.1586/erv.11.121] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The study of poxviruses pioneered the field of vaccinology after Jenner's remarkable discovery that 'vaccination' with the phylogenetically related cowpox virus conferred immunity to the devastating disease of smallpox. The study of poxviruses continues to enrich the field of virology because the global eradication of smallpox provides a unique example of the potency of effective immunization. Other poxviruses have since been developed as vaccine vectors for clinical and veterinary applications and include modified vaccinia virus strains such as modified vaccinia Ankara and NYVAC as well as the avipox viruses, fowlpox virus and canarypox virus. Despite the empirical development of poxvirus-based vectored vaccines, it is only now becoming apparent that we need to better understand how the innate arm of the immune system drives adaptive immunity to poxviruses, and how this information is relevant to vaccine design strategies, which are the topics addressed in this article.
Collapse
Affiliation(s)
- Erin L Lousberg
- Experimental Therapeutics Laboratory, Hanson Institute, Royal Adelaide Hospital, Adelaide, SA, 5000, Australia
| | | | | | | |
Collapse
|