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Taylor AP, Makabi-Panzu B, Chen X, Gold DV, Goldenberg DM. Evaluation of a non-viral vaccine in smallpox-vaccinated individuals and immunized HLA-transgenic mice. Hum Immunol 2012; 73:612-9. [PMID: 22504409 DOI: 10.1016/j.humimm.2012.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 02/28/2012] [Accepted: 03/19/2012] [Indexed: 11/18/2022]
Abstract
The current poxvirus vaccine is associated with rare, but serious adverse events. Therefore, we investigated a non-replicating approach to vaccine design. Peptides encoding potential HLA-binding motifs were derived from the orthopoxvirus genes, D8L, A27L, and C12L (the IL-18-binding protein [vIL18BP105]), all of which are preserved among poxviruses that infect humans, and which may be a target of host immunity. The peptides were tested with poxvirus-vaccinated human PBMC and serum for eliciting memory responses, as well as with splenocytes and serum from peptide-immunized, human HLA-DR04 transgenic (HLA tg) mice. vIL18BP105 induced 5-fold proliferation of vaccinated-donor PBMC over non-vaccinated (P<0.001), including IL-2-producing CD8+ cells. Serum IgG recognizing vIL18BP105 was detected (P<0.002 vs non-vaccinated) by ELISA. Viral peptides were conjugated to the HLA-targeting mAb, L243, for immunization of HLA tg mice. Splenocytes from vIL18BP105-L243-immunized mice proliferated upon exposure to vIL18BP105 (P<0.001). Proliferating splenocytes were interferon-γ-producing CD4(+)CD45RA(neg). vIL18BP105-L243-immunized mice generated IgG more rapidly than free-peptide-immunized mice. Peptide-specific antibody was also detected when different L243-peptide conjugates were combined. vIL18BP, by eliciting human memory responses, is a viable antigen for inclusion in a virus-free vaccine. The immunogenicity of peptides was boosted by conjugation to L243, whether administered alone or combined.
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Affiliation(s)
- Alice P Taylor
- Center for Molecular Medicine and Immunology/Garden State Cancer Center (CMMI/GSCC), 300 The American Road, Morris Plains, NJ 07950, USA.
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Hudson PN, Self J, Weiss S, Braden Z, Xiao Y, Girgis NM, Emerson G, Hughes C, Sammons SA, Isaacs SN, Damon IK, Olson VA. Elucidating the role of the complement control protein in monkeypox pathogenicity. PLoS One 2012; 7:e35086. [PMID: 22496894 PMCID: PMC3322148 DOI: 10.1371/journal.pone.0035086] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Accepted: 03/12/2012] [Indexed: 11/19/2022] Open
Abstract
Monkeypox virus (MPXV) causes a smallpox-like disease in humans. Clinical and epidemiological studies provide evidence of pathogenicity differences between two geographically distinct monkeypox virus clades: the West African and Congo Basin. Genomic analysis of strains from both clades identified a ∼10 kbp deletion in the less virulent West African isolates sequenced to date. One absent open reading frame encodes the monkeypox virus homologue of the complement control protein (CCP). This modulatory protein prevents the initiation of both the classical and alternative pathways of complement activation. In monkeypox virus, CCP, also known as MOPICE, is a ∼24 kDa secretory protein with sequence homology to this superfamily of proteins. Here we investigate CCP expression and its role in monkeypox virulence and pathogenesis. CCP was incorporated into the West African strain and removed from the Congo Basin strain by homologous recombination. CCP expression phenotypes were confirmed for both wild type and recombinant monkeypox viruses and CCP activity was confirmed using a C4b binding assay. To characterize the disease, prairie dogs were intranasally infected and disease progression was monitored for 30 days. Removal of CCP from the Congo Basin strain reduced monkeypox disease morbidity and mortality, but did not significantly decrease viral load. The inclusion of CCP in the West African strain produced changes in disease manifestation, but had no apparent effect on disease-associated mortality. This study identifies CCP as an important immuno-modulatory protein in monkeypox pathogenesis but not solely responsible for the increased virulence seen within the Congo Basin clade of monkeypox virus.
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Affiliation(s)
- Paul N Hudson
- Poxvirus and Rabies Branch, Division of High Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases and Biotechnology Core Facility Branch, Division of Safety Research, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America.
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Golden JW, Hooper JW. The strategic use of novel smallpox vaccines in the post-eradication world. Expert Rev Vaccines 2012; 10:1021-35. [PMID: 21806397 PMCID: PMC9491137 DOI: 10.1586/erv.11.46] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We still face a threat of orthopoxviruses in the form of biological weapons and emerging zoonoses. Therefore, there is a need to maintain a comprehensive defense strategy to counter the low-probability, high-impact threat of smallpox, as well as the ongoing threat of naturally occurring orthopoxvirus disease. The currently licensed live-virus smallpox vaccine ACAM2000 is effective, but associated with serious and even life-threatening adverse events. The health threat posed by this vaccine, and other previously licensed vaccines, has prevented many first responders, and even many in the military, from receiving a vaccine against smallpox. At the same time, global immunity produced during the smallpox eradication campaign is waning. Here, we review novel subunit/component vaccines and how they might play roles in unconventional strategies to defend against emerging orthopoxvirus diseases throughout the world and against smallpox used as a weapon of mass destruction.
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Affiliation(s)
- Joseph W Golden
- Department of Molecular Virology, Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA
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54
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Xu RH, Rubio D, Roscoe F, Krouse TE, Truckenmiller ME, Norbury CC, Hudson PN, Damon IK, Alcamí A, Sigal LJ. Antibody inhibition of a viral type 1 interferon decoy receptor cures a viral disease by restoring interferon signaling in the liver. PLoS Pathog 2012; 8:e1002475. [PMID: 22241999 PMCID: PMC3252373 DOI: 10.1371/journal.ppat.1002475] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Accepted: 11/22/2011] [Indexed: 02/04/2023] Open
Abstract
Type 1 interferons (T1-IFNs) play a major role in antiviral defense, but when or how they protect during infections that spread through the lympho-hematogenous route is not known. Orthopoxviruses, including those that produce smallpox and mousepox, spread lympho-hematogenously. They also encode a decoy receptor for T1-IFN, the T1-IFN binding protein (T1-IFNbp), which is essential for virulence. We demonstrate that during mousepox, T1-IFNs protect the liver locally rather than systemically, and that the T1-IFNbp attaches to uninfected cells surrounding infected foci in the liver and the spleen to impair their ability to receive T1-IFN signaling, thus facilitating virus spread. Remarkably, this process can be reversed and mousepox cured late in infection by treating with antibodies that block the biological function of the T1-IFNbp. Thus, our findings provide insights on how T1-IFNs function and are evaded during a viral infection in vivo, and unveil a novel mechanism for antibody-mediated antiviral therapy. Type 1 interferons are molecules important in the defense against viruses. Orthopoxviruses encode a Type 1 interferon binding protein that acts as a decoy for the Type 1 interferon receptor. Here we show that during infection with the Orthopoxvirus ectromelia virus, the agent of mousepox, Type 1 interferons protect the liver locally rather than systemically. We also show that the Type 1 interferon binding protein of ectromelia virus attaches to uninfected cells surrounding infected foci in the liver to impair their ability to receive Type 1 interferon signaling and facilitate virus spread and disease progression. We also show that this process can be reversed and mousepox cured late in infection by treating mice with antibodies that block the biological function of the Type 1 interferon binding protein. Because the Type 1 interferon binding proteins of different Orthopoxviruses are very well conserved, the antibodies also block the biological function of the Type 1 interferon binding proteins from variola virus (the virus of smallpox) and monkeypoxvirus. Thus, our findings provide insights on how Type 1 interferons function and are evaded during a viral infection in vivo, and unveil a novel mechanism for antibody-mediated antiviral therapy.
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MESH Headings
- Animals
- Antibodies, Viral/immunology
- Antibodies, Viral/pharmacology
- Cell Line
- Cricetinae
- Ectromelia virus/immunology
- Ectromelia virus/metabolism
- Ectromelia virus/pathogenicity
- Ectromelia, Infectious/drug therapy
- Ectromelia, Infectious/immunology
- Ectromelia, Infectious/metabolism
- Female
- Liver/immunology
- Liver/metabolism
- Liver/virology
- Mice
- Mice, Inbred BALB C
- Mice, SCID
- Receptor, Interferon alpha-beta/antagonists & inhibitors
- Receptor, Interferon alpha-beta/immunology
- Receptor, Interferon alpha-beta/metabolism
- Spleen/immunology
- Spleen/metabolism
- Spleen/virology
- Variola virus/immunology
- Variola virus/metabolism
- Viral Proteins/antagonists & inhibitors
- Viral Proteins/immunology
- Viral Proteins/metabolism
- Virulence Factors/antagonists & inhibitors
- Virulence Factors/immunology
- Virulence Factors/metabolism
- Virus Attachment/drug effects
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Affiliation(s)
- Ren-Huan Xu
- Immune Cell Development and Host Defense Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States of America
| | - Daniel Rubio
- Immune Cell Development and Host Defense Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States of America
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Felicia Roscoe
- Immune Cell Development and Host Defense Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States of America
| | - Tracy E. Krouse
- Department of Microbiology and Immunology, College of Medicine, Pennsylvania State University, Hershey, Pennsylvania, United States of America
| | - Mary Ellen Truckenmiller
- Department of Microbiology and Immunology, College of Medicine, Pennsylvania State University, Hershey, Pennsylvania, United States of America
| | - Christopher C. Norbury
- Department of Microbiology and Immunology, College of Medicine, Pennsylvania State University, Hershey, Pennsylvania, United States of America
| | - Paul N. Hudson
- Poxvirus and Rabies Branch, Division of High Consequence Pathogens and Pathology, NCEZID, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Inger K. Damon
- Poxvirus and Rabies Branch, Division of High Consequence Pathogens and Pathology, NCEZID, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Antonio Alcamí
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Luis J. Sigal
- Immune Cell Development and Host Defense Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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55
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Golden JW, Zaitseva M, Kapnick S, Fisher RW, Mikolajczyk MG, Ballantyne J, Golding H, Hooper JW. Polyclonal antibody cocktails generated using DNA vaccine technology protect in murine models of orthopoxvirus disease. Virol J 2011; 8:441. [PMID: 21933385 PMCID: PMC3192780 DOI: 10.1186/1743-422x-8-441] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2011] [Accepted: 09/20/2011] [Indexed: 12/17/2022] Open
Abstract
Background Previously we demonstrated that DNA vaccination of nonhuman primates (NHP) with a small subset of vaccinia virus (VACV) immunogens (L1, A27, A33, B5) protects against lethal monkeypox virus challenge. The L1 and A27 components of this vaccine target the mature virion (MV) whereas A33 and B5 target the enveloped virion (EV). Results Here, we demonstrated that the antibodies produced in vaccinated NHPs were sufficient to confer protection in a murine model of lethal Orthopoxvirus infection. We further explored the concept of using DNA vaccine technology to produce immunogen-specific polyclonal antibodies that could then be combined into cocktails as potential immunoprophylactic/therapeutics. Specifically, we used DNA vaccines delivered by muscle electroporation to produce polyclonal antibodies against the L1, A27, A33, and B5 in New Zealand white rabbits. The polyclonal antibodies neutralized both MV and EV in cell culture. The ability of antibody cocktails consisting of anti-MV, anti-EV, or a combination of anti-MV/EV to protect BALB/c mice was evaluated as was the efficacy of the anti-MV/EV mixture in a mouse model of progressive vaccinia. In addition to evaluating weight loss and lethality, bioimaging technology was used to characterize the spread of the VACV infections in mice. We found that the anti-EV cocktail, but not the anti-MV cocktail, limited virus spread and lethality. Conclusions A combination of anti-MV/EV antibodies was significantly more protective than anti-EV antibodies alone. These data suggest that DNA vaccine technology could be used to produce a polyclonal antibody cocktail as a possible product to replace vaccinia immune globulin.
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Affiliation(s)
- Joseph W Golden
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA
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56
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The ectromelia virus SPI-2 protein causes lethal mousepox by preventing NK cell responses. J Virol 2011; 85:11170-82. [PMID: 21849445 DOI: 10.1128/jvi.00256-11] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Ectromelia virus (ECTV) is a natural pathogen of mice that causes mousepox, and many of its genes have been implicated in the modulation of host immune responses. Serine protease inhibitor 2 (SPI-2) is one of these putative ECTV host response modifier proteins. SPI-2 is conserved across orthopoxviruses, but results defining its mechanism of action and in vivo function are lacking or contradictory. We studied the role of SPI-2 in mousepox by deleting the SPI-2 gene or its serine protease inhibitor reactive site. We found that SPI-2 does not affect viral replication or cell-intrinsic apoptosis pathways, since mutant viruses replicate in vitro as efficiently as wild-type virus. However, in the absence of SPI-2 protein, ECTV is attenuated in mousepox-susceptible mice, resulting in lower viral loads in the liver, decreased spleen pathology, and substantially improved host survival. This attenuation correlates with more effective immune responses in the absence of SPI-2, including an earlier serum gamma interferon (IFN-γ) response, raised serum interleukin 18 (IL-18), increased numbers of granzyme B(+) CD8(+) T cells, and, most notably, increased numbers and activation of NK cells. Both virus attenuation and the improved immune responses associated with SPI-2 deletion from ECTV are lost when mice are depleted of NK cells. Consequently, SPI-2 renders mousepox lethal in susceptible strains by preventing protective NK cell defenses.
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57
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Montanuy I, Alejo A, Alcami A. Glycosaminoglycans mediate retention of the poxvirus type I interferon binding protein at the cell surface to locally block interferon antiviral responses. FASEB J 2011; 25:1960-71. [PMID: 21372110 DOI: 10.1096/fj.10-177188] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Eradication of smallpox was accomplished 30 yr ago, but poxviral infections still represent a public health concern due to the potential release of variola virus or the emergence of zoonotic poxviruses, such as monkeypox virus. A critical determinant of poxvirus virulence is the inhibition of interferons (IFNs) by the virus-encoded type I IFN-binding protein (IFNα/βBP). This immunomodulatory protein is secreted and has the unique property of interacting with the cell surface in order to prevent IFN-mediated antiviral responses. However, the mechanism of its attachment to the cell surface remains unknown. Using surface plasmon resonance and cell-binding assays, we report that the IFNα/βBP from vaccinia virus, the smallpox vaccine, interacts with cell surface glycosaminoglycans (GAGs). Analysis of the contribution of different regions of the protein to cell surface binding demonstrated that clusters of basic residues in the first immunoglobulin domain mediate GAG interactions. Furthermore, mutation of the GAG-interaction motifs does not affect its IFN-binding and -blocking capacity. Functional conservation of GAG-binding sites is demonstrated for the IFNα/βBP from variola and monkeypox viruses, extending our understanding of immune modulation by the most virulent human poxviruses. These results are relevant for the design of improved vaccines and intervention strategies.
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Affiliation(s)
- Imma Montanuy
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas y Universidad Autónoma de Madrid, Nicolás Cabrera, 1. Campus de Cantoblanco, 28049 Madrid, Spain
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58
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Fang M, Roscoe F, Sigal LJ. Age-dependent susceptibility to a viral disease due to decreased natural killer cell numbers and trafficking. ACTA ACUST UNITED AC 2010; 207:2369-81. [PMID: 20876312 PMCID: PMC2964566 DOI: 10.1084/jem.20100282] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Although it is well known that aged hosts are generally more susceptible to viral diseases than the young, specific dysfunctions of the immune system directly responsible for this increased susceptibility have yet to be identified. We show that mice genetically resistant to mousepox (the mouse parallel of human smallpox) lose resistance at mid-age. Surprisingly, this loss of resistance is not a result of intrinsically defective T cell responses. Instead, the primary reason for the loss of resistance results from a decreased number of total and mature natural killer (NK) cells in the blood and an intrinsic impairment in their ability to migrate to the lymph node draining the site of infection, which is essential to curb systemic virus spread. Hence, our work links the age-dependent increase in susceptibility to a viral disease to a specific defect of NK cells, opening the possibility of exploring treatments to improve NK cell function in the aged with the goal of enhancing their resistance to viral diseases.
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Affiliation(s)
- Min Fang
- Immune Cell Development and Host Defense Program, Fox Chase Cancer Center, Philadelphia, PA 19111, USA
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59
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Evaluating the orthopoxvirus type I interferon-binding molecule as a vaccine target in the vaccinia virus intranasal murine challenge model. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2010; 17:1656-65. [PMID: 20844086 DOI: 10.1128/cvi.00235-10] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The biological threat imposed by orthopoxviruses warrants the development of safe and effective vaccines. We developed a candidate orthopoxvirus DNA-based vaccine, termed 4pox, which targets four viral structural components, A33, B5, A27, and L1. While this vaccine protects mice and nonhuman primates from lethal infections, we are interested in further enhancing its potency. One approach to enhance potency is to include additional orthopoxvirus immunogens. Here, we investigated whether vaccination with the vaccinia virus (VACV) interferon (IFN)-binding molecule (IBM) could protect BALB/c mice against lethal VACV challenge. We found that vaccination with this molecule failed to significantly protect mice from VACV when delivered alone. IBM modestly augmented protection when delivered together with the 4pox vaccine. All animals receiving the 4pox vaccine plus IBM lived, whereas only 70% of those receiving a single dose of 4pox vaccine survived. Mapping studies using truncated mutants revealed that vaccine-generated antibodies spanned the immunoglobulin superfamily domains 1 and 2 and, to a lesser extent, 3 of the IBM. These antibodies inhibited IBM cell binding and IFN neutralization activity, indicating that they were functionally active. This study shows that DNA vaccination with the VACV IBM results in a robust immune response but that this response does not significantly enhance protection in a high-dose challenge model.
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60
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Fernández de Marco MDM, Alejo A, Hudson P, Damon IK, Alcami A. The highly virulent variola and monkeypox viruses express secreted inhibitors of type I interferon. FASEB J 2010; 24:1479-88. [PMID: 20019241 PMCID: PMC2857867 DOI: 10.1096/fj.09-144733] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2009] [Accepted: 11/25/2009] [Indexed: 12/21/2022]
Abstract
Variola virus (VARV) caused smallpox, one of the most devastating human diseases and the first to be eradicated, but its deliberate release represents a dangerous threat. Virulent orthopoxviruses infecting humans, such as monkeypox virus (MPXV), could fill the niche left by smallpox eradication and the cessation of vaccination. However, immunomodulatory activities and virulence determinants of VARV and MPXV remain largely unexplored. We report the molecular characterization of the VARV- and MPXV-secreted type I interferon-binding proteins, which interact with the cell surface after secretion and prevent type I interferon responses. The proteins expressed in the baculovirus system have been purified, and their interferon-binding properties characterized by surface plasmon resonance. The ability of these proteins to inhibit a broad range of interferons was investigated to identify potential adaptation to the human immune system. Furthermore, we demonstrate by Western blot and activity assays the expression of the type I interferon inhibitor during VARV and MPXV infections. These findings are relevant for the design of new vaccines and therapeutics to smallpox and emergent virulent orthopoxviruses because the type I interferon-binding protein is a major virulence factor in animal models, vaccination with this protein induces protective immunity, and its neutralization prevents disease progression.
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Affiliation(s)
- María del Mar Fernández de Marco
- Centro de Biología Molecular Severo Ochoa (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), C/Nicolás Cabrera, 1. Campus de Cantoblanco, 28049 Madrid, Spain
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61
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Stabenow J, Buller RM, Schriewer J, West C, Sagartz JE, Parker S. A mouse model of lethal infection for evaluating prophylactics and therapeutics against Monkeypox virus. J Virol 2010; 84:3909-20. [PMID: 20130052 PMCID: PMC2849515 DOI: 10.1128/jvi.02012-09] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Accepted: 01/22/2010] [Indexed: 01/14/2023] Open
Abstract
Monkeypox virus (MPXV) is an orthopoxvirus closely related to variola, the etiological agent of smallpox. In humans, MPXV causes a disease similar to smallpox and is considered to be an emerging infectious disease. Moreover, the use of MPXV for bioterroristic/biowarfare activities is of significant concern. Available small animal models of human monkeypox have been restricted to mammals with poorly defined biologies that also have limited reagent availability. We have established a murine MPXV model utilizing the STAT1-deficient C57BL/6 mouse. Here we report that a relatively low-dose intranasal (IN) infection induces 100% mortality in the stat1(-)(/)(-) model by day 10 postinfection with high infectious titers in the livers, spleens, and lungs of moribund animals. Vaccination with modified vaccinia virus Ankara (MVA) followed by a booster vaccination is sufficient to protect against an intranasal MPXV challenge and induces an immune response more robust than that of a single vaccination. Furthermore, antiviral treatment with CMX001 (HDP-cidofovir) and ST-246 protects when administered as a regimen initiated on the day of infection. Thus, the stat1(-)(/)(-) model provides a lethal murine platform for evaluating therapeutics and for investigating the immunological and pathological responses to MPXV infection.
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Affiliation(s)
- Jennifer Stabenow
- Department of Molecular Microbiology and Immunology, Department of Comparative Medicine, Saint Louis University Medical School, 1100 S. Grand Blvd., St Louis, Missouri 63104, Seventh Wave Laboratories, LLC, 743 Sprint 40 Park Drive, Suite 209, Chesterfield, Missouri 63005
| | - R. Mark Buller
- Department of Molecular Microbiology and Immunology, Department of Comparative Medicine, Saint Louis University Medical School, 1100 S. Grand Blvd., St Louis, Missouri 63104, Seventh Wave Laboratories, LLC, 743 Sprint 40 Park Drive, Suite 209, Chesterfield, Missouri 63005
| | - Jill Schriewer
- Department of Molecular Microbiology and Immunology, Department of Comparative Medicine, Saint Louis University Medical School, 1100 S. Grand Blvd., St Louis, Missouri 63104, Seventh Wave Laboratories, LLC, 743 Sprint 40 Park Drive, Suite 209, Chesterfield, Missouri 63005
| | - Cheri West
- Department of Molecular Microbiology and Immunology, Department of Comparative Medicine, Saint Louis University Medical School, 1100 S. Grand Blvd., St Louis, Missouri 63104, Seventh Wave Laboratories, LLC, 743 Sprint 40 Park Drive, Suite 209, Chesterfield, Missouri 63005
| | - John E. Sagartz
- Department of Molecular Microbiology and Immunology, Department of Comparative Medicine, Saint Louis University Medical School, 1100 S. Grand Blvd., St Louis, Missouri 63104, Seventh Wave Laboratories, LLC, 743 Sprint 40 Park Drive, Suite 209, Chesterfield, Missouri 63005
| | - Scott Parker
- Department of Molecular Microbiology and Immunology, Department of Comparative Medicine, Saint Louis University Medical School, 1100 S. Grand Blvd., St Louis, Missouri 63104, Seventh Wave Laboratories, LLC, 743 Sprint 40 Park Drive, Suite 209, Chesterfield, Missouri 63005
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62
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Rich RL, Myszka DG. Grading the commercial optical biosensor literature-Class of 2008: 'The Mighty Binders'. J Mol Recognit 2010; 23:1-64. [PMID: 20017116 DOI: 10.1002/jmr.1004] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Optical biosensor technology continues to be the method of choice for label-free, real-time interaction analysis. But when it comes to improving the quality of the biosensor literature, education should be fundamental. Of the 1413 articles published in 2008, less than 30% would pass the requirements for high-school chemistry. To teach by example, we spotlight 10 papers that illustrate how to implement the technology properly. Then we grade every paper published in 2008 on a scale from A to F and outline what features make a biosensor article fabulous, middling or abysmal. To help improve the quality of published data, we focus on a few experimental, analysis and presentation mistakes that are alarmingly common. With the literature as a guide, we want to ensure that no user is left behind.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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63
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Hooper JW, Ferro AM, Golden JW, Silvera P, Dudek J, Alterson K, Custer M, Rivers B, Morris J, Owens G, Smith JF, Kamrud KI. Molecular smallpox vaccine delivered by alphavirus replicons elicits protective immunity in mice and non-human primates. Vaccine 2009; 28:494-511. [PMID: 19833247 DOI: 10.1016/j.vaccine.2009.09.133] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 09/18/2009] [Accepted: 09/30/2009] [Indexed: 11/27/2022]
Abstract
Naturally occurring smallpox was eradicated as a result of successful vaccination campaigns during the 1960s and 1970s. Because of its highly contagious nature and high mortality rate, smallpox has significant potential as a biological weapon. Unfortunately, the current vaccine for orthopoxviruses is contraindicated for large portions of the population. Thus, there is a need for new, safe, and effective orthopoxvirus vaccines. Alphavirus replicon vectors, derived from strains of Venezuelan equine encephalitis virus, are being used to develop alternatives to the current smallpox vaccine. Here, we demonstrated that virus-like replicon particles (VRPs) expressing the vaccinia virus A33R, B5R, A27L, and L1R genes elicited protective immunity in mice comparable to vaccination with live-vaccinia virus. Furthermore, cynomolgus macaques vaccinated with a combination of the four poxvirus VRPs (4pox-VRP) developed antibody responses to each antigen. These antibody responses were able to neutralize and inhibit the spread of both vaccinia virus and monkeypox virus. Macaques vaccinated with 4pox-VRP, flu HA VRP (negative control), or live-vaccinia virus (positive control) were challenged intravenously with 5 x 10(6)pfu of monkeypox virus 1 month after the second VRP vaccination. Four of the six negative control animals succumbed to monkeypox and the remaining two animals demonstrated either severe or grave disease. Importantly, all 10 macaques vaccinated with the 4pox-VRP vaccine survived without developing severe disease. These findings revealed that a single-boost VRP smallpox vaccine shows promise as a safe alternative to the currently licensed live-vaccinia virus smallpox vaccine.
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Affiliation(s)
- Jay W Hooper
- US Army Medical Research Institute of Infectious Diseases, Virology Division, 1425 Porter Street, Fort Detrick, MD 21702, United States.
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Borovkov A, Magee DM, Loskutov A, Cano JA, Selinsky C, Zsemlye J, Lyons CR, Sykes K. New classes of orthopoxvirus vaccine candidates by functionally screening a synthetic library for protective antigens. Virology 2009; 395:97-113. [PMID: 19800089 DOI: 10.1016/j.virol.2009.09.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2009] [Revised: 07/22/2009] [Accepted: 09/05/2009] [Indexed: 10/20/2022]
Abstract
The licensed smallpox vaccine, comprised of infectious vaccinia, is no longer popular as it is associated with a variety of adverse events. Safer vaccines have been explored such as further attenuated viruses and component designs. However, these alternatives typically provide compromised breadth and strength of protection. We conducted a genome-level screening of cowpox, the ancestral poxvirus, in the broadly immune-presenting C57BL/6 mouse as an approach to discovering novel components with protective capacities. Cowpox coding sequences were synthetically built and directly assayed by genetic immunization for open-reading frames that protect against lethal pulmonary infection. Membrane and non-membrane antigens were identified that partially protect C57BL/6 mice against cowpox and vaccinia challenges without adjuvant or regimen optimization, whereas the 4-pox vaccine did not. New vaccines might be developed from productive combinations of these new and existing antigens to confer potent, broadly efficacious protection and be contraindicated for none.
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Affiliation(s)
- Alexandre Borovkov
- Center for Innovations in Medicine at The Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
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Alejo A, Saraiva M, Ruiz-Argüello MB, Viejo-Borbolla A, de Marco MF, Salguero FJ, Alcami A. A method for the generation of ectromelia virus (ECTV) recombinants: in vivo analysis of ECTV vCD30 deletion mutants. PLoS One 2009; 4:e5175. [PMID: 19365546 PMCID: PMC2664468 DOI: 10.1371/journal.pone.0005175] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Accepted: 03/10/2009] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Ectromelia virus (ECTV) is the causative agent of mousepox, a lethal disease of mice with similarities to human smallpox. Mousepox progression involves replication at the initial site of infection, usually the skin, followed by a rapid spread to the secondary replicative organs, spleen and liver, and finally a dissemination to the skin, where the typical rash associated with this and other orthopoxviral induced diseases appears. Case fatality rate is genetically determined and reaches up to 100% in susceptible mice strains. Like other poxviruses, ECTV encodes a number of proteins with immunomodulatory potential, whose role in mousepox progression remains largely undescribed. Amongst these is a secreted homologue of the cellular tumour necrosis factor receptor superfamily member CD30 which has been proposed to modulate a Th1 immune response in vivo. METHODOLOGY/PRINCIPAL FINDINGS To evaluate the contribution of viral CD30 (vCD30) to virus pathogenesis in the infected host, we have adapted a novel transient dominant method for the selection of recombinant ECTVs. Using this method, we have generated an ECTV vCD30 deletion mutant, its corresponding revertant control virus as well as a virus encoding the extracellular domain of murine CD30. These viruses contain no exogenous marker DNA sequences in their genomes, as opposed to other ECTVs reported up to date. CONCLUSIONS/SIGNIFICANCE We show that the vCD30 is expressed as a secreted disulfide linked trimer and that the absence of vCD30 does not impair mousepox induced fatality in vivo. Replacement of vCD30 by a secreted version of mouse CD30 caused limited attenuation of ECTV. The recombinant viruses generated may be of use in the study of the role of the cellular CD30-CD30L interaction in the development of the immune response. The method developed might be useful for the construction of ECTV mutants for the study of additional genes.
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Affiliation(s)
- Ali Alejo
- Centro de Investigación en Sanidad Animal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Valdeolmos, Madrid, Spain
| | - Margarida Saraiva
- Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Maria Begoña Ruiz-Argüello
- Centro de Investigación en Sanidad Animal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Valdeolmos, Madrid, Spain
| | - Abel Viejo-Borbolla
- Centro de Biología Molecular Severo Ochoa (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), Cantoblanco, Madrid, Spain
| | - Mar Fernández de Marco
- Centro de Biología Molecular Severo Ochoa (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), Cantoblanco, Madrid, Spain
| | - Francisco Javier Salguero
- Centro de Investigación en Sanidad Animal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Valdeolmos, Madrid, Spain
| | - Antonio Alcami
- Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Cambridge, United Kingdom
- Centro de Biología Molecular Severo Ochoa (Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid), Cantoblanco, Madrid, Spain
- * E-mail:
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Paran N, Suezer Y, Lustig S, Israely T, Schwantes A, Melamed S, Katz L, Preuss T, Hanschmann KM, Kalinke U, Erez N, Levin R, Velan B, Löwer J, Shafferman A, Sutter G. Postexposure immunization with modified vaccinia virus Ankara or conventional Lister vaccine provides solid protection in a murine model of human smallpox. J Infect Dis 2009; 199:39-48. [PMID: 19012492 DOI: 10.1086/595565] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Decades after the cessation of smallpox vaccination, the potential of the deliberate release of pathogenic orthopoxviruses has forced a reconsideration of using these extremely efficient human vaccines. Scenarios of sudden biothreats have prompted demand for rapidly protective vaccination. However, the feasibility of short-term vaccination (i.e., vaccination shortly before exposure) with vaccinia virus (VACV) is uncertain. METHODS We tested the rapid protective capacity of vaccines based on VACV strain Lister (VACV-Lister) and on modified VACV Ankara (MVA) in different mouse models, comparing lethal infections with VACV strain Western Reserve (VACV-WR) or ectromelia virus (ECTV). RESULTS In contrast to VACV-WR challenge, we found extended incubation periods after ECTV challenge, allowing successful therapeutic immunization with VACV-Lister and MVA when applied 2-3 days after exposure. Rapid protection from respiratory tract ECTV infection was significantly affected by vaccine dose and was associated with occurrence of poxvirus-specific antibodies. Vaccinations in type I interferon receptor-deficient mice were protective, whereas recombination activating gene 1-deficient mice lacking mature T and B cells failed to mount immunity after short-term vaccination, confirming an essential role of adaptive immune responses. CONCLUSIONS ECTV infection in mice models the course of human smallpox. Our data provide evidence to substantiate historical data on the usefulness of postexposure vaccination with conventional VACV and the new candidate MVA to protect against fatal orthopoxvirus infections.
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Affiliation(s)
- Nir Paran
- Israel Institute for Biological Research, Ness-Ziona, Israel
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Structural basis for antagonism of human interleukin 18 by poxvirus interleukin 18-binding protein. Proc Natl Acad Sci U S A 2008; 105:20711-5. [PMID: 19104048 DOI: 10.1073/pnas.0809086106] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Human interleukin-18 (hIL-18) is a cytokine that plays an important role in inflammation and host defense against microbes. Its activity is regulated in vivo by a naturally occurring antagonist, the human IL-18-binding protein (IL-18BP). Functional homologs of human IL-18BP are encoded by all orthopoxviruses, including variola virus, the causative agent of smallpox. They contribute to virulence by suppressing IL-18-mediated immune responses. Here, we describe the 2.0-A resolution crystal structure of an orthopoxvirus IL-18BP, ectromelia virus IL-18BP (ectvIL-18BP), in complex with hIL-18. The hIL-18 structure in the complex shows significant conformational change at the binding interface compared with the structure of ligand-free hIL-18, indicating that the binding is mediated by an induced-fit mechanism. EctvIL-18BP adopts a canonical Ig fold and interacts via one edge of its beta-sandwich with 3 cavities on the hIL-18 surface through extensive hydrophobic and hydrogen bonding interactions. Most of the ectvIL-18BP residues that participate in these interactions are conserved in both human and viral homologs, explaining their functional equivalence despite limited sequence homology. EctvIL-18BP blocks a putative receptor-binding site on IL-18, thus preventing IL-18 from engaging its receptor. Our structure provides insights into how IL-18BPs modulate hIL-18 activity. The revealed binding interface provides the basis for rational design of inhibitors against orthopoxvirus IL-18BP (for treating orthopoxvirus infection) or hIL-18 (for treating certain inflammatory and autoimmune diseases).
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Abstract
SUMMARY Monkeypox is a disease that is endemic in Central and Western Africa. However, in 2003, there was an outbreak in the United States, representing the first documented monkeypox cases in the Western hemisphere. Although monkeypox virus is less fatal and not as transmissible as variola virus, the causative agent of smallpox, there is concern that monkeypox virus could become a more efficient human pathogen. The reason for this may lie in the virus' genetic makeup, ecological changes, changes in host behavior, and the fact that with the eradication of variola virus, routine smallpox vaccination is no longer carried out. In this review, we focus on the viral proteins that are predicted to modulate the host immune response and compare the genome of monkeypox virus with the genomes of variola virus and the vaccinia virus, the orthopoxvirus that represented the smallpox vaccine. There are differences found in several of these immune-modulating genes including genes that express proteins that affect cytokines such as interleukin-1, tumor necrosis factor, and interferon. There are also differences in genes that code for virulence factors and host range proteins. Genetic differences likely also explain the differences in virulence between two strains of monkeypox virus found in two different regions of Africa. In the current setting of limited smallpox vaccination and little orthopoxvirus immunity in parts of the world, monkeypox could become a more efficient human pathogen under the right circumstances.
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Affiliation(s)
- Jessica R Weaver
- Department of Medicine, Division of Infectious Diseases, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6073, USA
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