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Hassan HA, Abdelwahab SF, Al-Khdhairawi A, Al Zrkani MK, Rehman HM, Abdel-Rahman IM, El-Sheikh AAK, Abdelhamid MM. Exploring the therapeutic potential of galidesivir analogs against Zaire ebolavirus protein 24 (V24): database screening, molecular docking, drug-relevant property evaluation and molecular dynamics simulations. J Biomol Struct Dyn 2024; 42:6761-6771. [PMID: 37477257 DOI: 10.1080/07391102.2023.2236720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 07/08/2023] [Indexed: 07/22/2023]
Abstract
The recent outbreak of the Ebola virus (EBOV) has marked it as one of the most severe health threats globally. Among various anti-EBOV inhibitors studied, galidesivir (BCX4430) has shown remarkable efficacy. This study aims to identify novel potential anti-EBOV drugs among galidesivir analogs, focusing on the Zaire ebolavirus (Z-EBOV), which exhibits a mortality rate of 90%. We subjected 200 candidate compounds to molecular docking calculations, followed by an evaluation of the bioactivity of the top 25 compounds using the OSIRIS Property Explorer. Initial 50 ns molecular dynamics (MD) simulations were then performed. According to our findings, only six compounds exhibited positive drug scores. We further performed molecular mechanics Poisson-Boltzmann surface area (MM/PBSA) calculations of binding energy over 50 ns, selecting the two top-performing compounds for extended 150 ns MD simulations. CID 117698807 and CID 117712809 showed higher binding stability compared to galidesivir, with ΔGbinding values of -36.7 and -53.4 kcal/mol, respectively. Both compounds demonstrated high stability within the Z-EBOV-V24 active site over the 150 ns MD simulations. Hence, our study proposes CID 117698807 and CID 117712809 as potential anti-Z-EBOV-V24 drug candidates, warranting further investigation.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Heba Ali Hassan
- Department of Pharmacognosy, Faculty of Pharmacy, Sohag University, Sohag, Egypt
| | - Sayed F Abdelwahab
- Department of Pharmaceutics and Industrial Pharmacy, College of Pharmacy, Taif University, Taif, Saudi Arabia
| | - Ahmad Al-Khdhairawi
- Department of Biological Science and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia
| | - Mrtatha K Al Zrkani
- Institute of Genetic Engineering & Biotechnology Research, Baghdad University, Iraq
| | - Hafiz Muzzammel Rehman
- School of Biochemistry and Biotechnology, University of the Punjab, Lahore, Punjab, Pakistan
- Department of Human Genetics and Molecular Biology, University of Health Sciences, Lahore, Pakistan
| | - Islam M Abdel-Rahman
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Deraya University, New-Minia, Egypt
| | - Azza A K El-Sheikh
- Basic Health Sciences Department, College of Medicine, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Mahmoud M Abdelhamid
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Al-Azhar University, Assiut, Egypt
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2
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Liu CH, Hu YT, Wong SH, Lin LT. Therapeutic Strategies against Ebola Virus Infection. Viruses 2022; 14:v14030579. [PMID: 35336986 PMCID: PMC8954160 DOI: 10.3390/v14030579] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 03/03/2022] [Accepted: 03/08/2022] [Indexed: 12/10/2022] Open
Abstract
Since the 2014–2016 epidemic, Ebola virus (EBOV) has spread to several countries and has become a major threat to global health. EBOV is a risk group 4 pathogen, which imposes significant obstacles for the development of countermeasures against the virus. Efforts have been made to develop anti-EBOV immunization and therapeutics, with three vaccines and two antibody-based therapeutics approved in recent years. Nonetheless, the high fatality of Ebola virus disease highlights the need to continuously develop antiviral strategies for the future management of EBOV outbreaks in conjunction with vaccination programs. This review aims to highlight potential EBOV therapeutics and their target(s) of inhibition, serving as a summary of the literature to inform readers of the novel candidates available in the continued search for EBOV antivirals.
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Affiliation(s)
- Ching-Hsuan Liu
- Department of Microbiology and Immunology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Yee-Tung Hu
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Shu Hui Wong
- International Ph.D. Program in Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Liang-Tzung Lin
- Department of Microbiology and Immunology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Correspondence:
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3
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Abstract
Outbreaks of severe virus infections with the potential to cause global pandemics are increasing. In many instances these outbreaks have been newly emerging (SARS coronavirus), re-emerging (Ebola virus, Zika virus) or zoonotic (avian influenza H5N1) virus infections. In the absence of a targeted vaccine or a pathogen-specific antiviral, broad-spectrum antivirals would function to limit virus spread. Given the direct antiviral effects of type I interferons (IFNs) in inhibiting the replication of both DNA and RNA viruses at different stages of their replicative cycles, and the effects of type I IFNs on activating immune cell populations to clear virus infections, IFNs-α/β present as ideal candidate broad-spectrum antivirals.
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Affiliation(s)
- Ben X Wang
- Princess Margaret Cancer Center, Tumor Immunotherapy Program, University Health Network, Toronto, ON M5G 2M9, Canada
| | - Eleanor N Fish
- Toronto General Hospital Research Institute, University Health Network, 67 College Street, Toronto, ON M5G 2M1, Canada; Department of Immunology, University of Toronto, 1 King's College Circle, Toronto, ON M5S 1A8, Canada.
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4
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Liu G, Wong G, Su S, Bi Y, Plummer F, Gao GF, Kobinger G, Qiu X. Clinical Evaluation of Ebola Virus Disease Therapeutics. Trends Mol Med 2017; 23:820-830. [PMID: 28822631 DOI: 10.1016/j.molmed.2017.07.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 07/11/2017] [Accepted: 07/11/2017] [Indexed: 01/17/2023]
Abstract
Ebola virus disease (EVD) was first described over 40 years ago, but no treatment has been approved for humans. The 2013-2016 EVD outbreak in West Africa has expedited the clinical evaluation of several candidate therapeutics that act through different mechanisms, but with mixed results. Nevertheless, these studies are important because the accumulation of clinical data and valuable experience in conducting efficacy trials under emergency circumstances will lead to better implementation of similar studies in the future. Here, we summarize the results of EVD clinical trials, focus on the discussion of factors that may have potentially impeded the effectiveness of existing candidate therapeutics, and highlight considerations that may help meet the challenges ahead in the quest to develop clinically approved drugs.
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Affiliation(s)
- Guodong Liu
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Gary Wong
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Shenzhen Key Laboratory of Pathogen and Immunity, State Key Discipline of Infectious Disease, Shenzhen Third People's Hospital, Shenzhen, China; Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada; CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Shuo Su
- Jiangsu Engineering Laboratory of Animal Immunology, Institute of Immunology and College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Yuhai Bi
- Shenzhen Key Laboratory of Pathogen and Immunity, State Key Discipline of Infectious Disease, Shenzhen Third People's Hospital, Shenzhen, China; CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Frank Plummer
- Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada
| | - George F Gao
- Shenzhen Key Laboratory of Pathogen and Immunity, State Key Discipline of Infectious Disease, Shenzhen Third People's Hospital, Shenzhen, China; CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Gary Kobinger
- Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada; Département de microbiologie-infectiologie et d'immunologie, Université Laval, Québec, Canada
| | - Xiangguo Qiu
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada.
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5
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Konde MK, Baker DP, Traore FA, Sow MS, Camara A, Barry AA, Mara D, Barry A, Cone M, Kaba I, Richard AA, Beavogui AH, Günther S, Pintilie M, Fish EN. Interferon β-1a for the treatment of Ebola virus disease: A historically controlled, single-arm proof-of-concept trial. PLoS One 2017; 12:e0169255. [PMID: 28225767 PMCID: PMC5321269 DOI: 10.1371/journal.pone.0169255] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 12/13/2016] [Indexed: 11/19/2022] Open
Abstract
To date there are no approved antiviral drugs for the treatment of Ebola virus disease (EVD). Based on our in vitro evidence of antiviral activity of interferon (IFN)-ß activity against Ebola virus, we conducted a single arm clinical study in Guinea to evaluate the safety and therapeutic efficacy of IFN β-1a treatment for EVD. Nine individuals infected with Ebola virus were treated with IFN β-1a and compared retrospectively with a matched cohort of 21 infected patients receiving standardized supportive care only during the same time period at the same treatment unit. Cognizant of the limitations of having treated only 9 individuals with EVD, the data collected are cautiously considered. When compared to supportive care only, IFN β-1a treatment seemed to facilitate viral clearance from the blood and appeared associated with earlier resolution of disease symptoms. Survival, calculated from the date of consent for those in the trial and date of admission from those in the control cohort, to the date of death, was 19% for those receiving supportive care only, compared to 67% for those receiving supportive care plus IFN β-1a. Given the differences in baseline blood viremia between the control cohort and the IFN-treated cohort, an additional 17 controls were included for a subset analysis, from other treatment units in Guinea, matched with the IFN-treated patients based on age and baseline blood viremia. Subset analyses using this expanded control cohort suggests that patients without IFN β-1a treatment were ~ 1.5–1.9 fold more likely to die than those treated. Viewed altogether the results suggest a rationale for further clinical evaluation of IFN β-1a.
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Affiliation(s)
- Mandy Kader Konde
- Sustainable Health Foundation (FOSAD), Conakry, Guinea.,Center of Excellence for Training on Research and Priority Diseases (CEFORPAG), Conakry, Guinea
| | - Darren P Baker
- Sanofi Genzyme, Cambridge, Massachusetts, United Staes of America
| | | | | | - Alioune Camara
- Center of Excellence for Training on Research and Priority Diseases (CEFORPAG), Conakry, Guinea
| | - Alpha Amadou Barry
- Center of Excellence for Training on Research and Priority Diseases (CEFORPAG), Conakry, Guinea
| | - Doussou Mara
- Center of Excellence for Training on Research and Priority Diseases (CEFORPAG), Conakry, Guinea
| | - Abdoulaye Barry
- Center of Excellence for Training on Research and Priority Diseases (CEFORPAG), Conakry, Guinea
| | - Moussa Cone
- Center of Excellence for Training on Research and Priority Diseases (CEFORPAG), Conakry, Guinea
| | - Ibrahima Kaba
- Infectious Disease Ward, National Donka Hospital, Conakry, Guinea
| | - Amento Ablam Richard
- Center of Excellence for Training on Research and Priority Diseases (CEFORPAG), Conakry, Guinea
| | - Abdoul Habib Beavogui
- Center of Excellence for Training on Research and Priority Diseases (CEFORPAG), Conakry, Guinea
| | - Stephan Günther
- Bernhard-Nocht-Institute for Tropical Medicine, Hamburg, Germany
| | | | - Melania Pintilie
- Department of Biostatistics, University Health Network, Toronto, Canada
| | - Eleanor N Fish
- Toronto General Research Institute, University Health Network, Toronto, Canada.,Department of Immunology, University of Toronto, Toronto, Canada
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6
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Post-exposure treatment of Ebola virus disease in guinea pigs using EBOTAb, an ovine antibody-based therapeutic. Sci Rep 2016; 6:30497. [PMID: 27465308 PMCID: PMC4964638 DOI: 10.1038/srep30497] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 07/04/2016] [Indexed: 01/14/2023] Open
Abstract
Ebola virus (EBOV) is highly pathogenic, with a predisposition to cause outbreaks in human populations accompanied by significant mortality. An ovine polyclonal antibody therapy has been developed against EBOV, named EBOTAb. When tested in the stringent guinea pig model of EBOV disease, EBOTAb has been shown to confer protection at levels of 83.3%, 50% and 33.3% when treatment was first started on days 3, 4 and 5 post-challenge, respectively. These timepoints of when EBOTAb treatment was initiated correspond to when levels of EBOV are detectable in the circulation and thus mimic when treatment would likely be initiated in human infection. The effects of EBOTAb were compared with those of a monoclonal antibody cocktail, ZMapp, when delivered on day 3 post-challenge. Results showed ZMapp to confer complete protection against lethal EBOV challenge in the guinea pig model at this timepoint. The data reported demonstrate that EBOTAb is an effective treatment against EBOV disease, even when delivered late after infection.
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7
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Backs against the wall: novel and existing strategies used during the 2014-2015 Ebola virus outbreak. Clin Microbiol Rev 2015; 28:593-601. [PMID: 25972518 DOI: 10.1128/cmr.00014-15] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The 2014-2015 outbreak of Ebola virus (EBOV), originating from Guinea, is now responsible for the infection of >20,000 people in 9 countries. Whereas past filovirus outbreaks in sub-Saharan Africa have been rapidly brought under control with comparably few cases, this outbreak has been particularly resistant to containment efforts. Both the general population and primary health care workers have been affected by this outbreak, with hundreds of doctors and nurses being infected in the line of duty. In the absence of approved therapeutics, several caregivers have turned to investigational new drugs as well as experimental therapies in an effort to save lives. This review aims to summarize the candidates currently under consideration for postexposure use in infected patients during the largest EBOV outbreak in history.
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8
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Wong G, Richardson JS, Pillet S, Racine T, Patel A, Soule G, Ennis J, Turner J, Qiu X, Kobinger GP. Adenovirus-Vectored Vaccine Provides Postexposure Protection to Ebola Virus-Infected Nonhuman Primates. J Infect Dis 2015; 212 Suppl 2:S379-83. [PMID: 25957963 DOI: 10.1093/infdis/jiv102] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Ebola virus (EBOV) causes lethal disease in up to 90% of EBOV-infected humans. Among vaccines, only the vesicular stomatitis virus platform has been successful in providing postexposure protection in nonhuman primates. Here, we show that an adjuvanted human adenovirus serotype 5 (Ad5)-vectored vaccine (Ad5-Zaire EBOV glycoprotein) protected 67% (6 of 9) and 25% (1 of 4) of cynomolgus macaques when administered 30 minutes and 24 hours following EBOV challenge, respectively. The treatment also protected 33% of rhesus macaques (1 of 3) when given at 24 hours. The results highlight the utility of adjuvanted Ad5 vaccines for rapid immunization against EBOV.
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Affiliation(s)
- Gary Wong
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada Department of Medical Microbiology
| | - Jason S Richardson
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada
| | - Stéphane Pillet
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada
| | - Trina Racine
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada
| | - Ami Patel
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada Department of Medical Microbiology
| | - Geoff Soule
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada
| | | | | | - Xiangguo Qiu
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada Department of Medical Microbiology
| | - Gary P Kobinger
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada Department of Medical Microbiology Department of Immunology, University of Manitoba, Winnipeg Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia
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9
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Establishment and characterization of a lethal mouse model for the Angola strain of Marburg virus. J Virol 2014; 88:12703-14. [PMID: 25142608 DOI: 10.1128/jvi.01643-14] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
UNLABELLED Infections with Marburg virus (MARV) and Ebola virus (EBOV) cause severe hemorrhagic fever in humans and nonhuman primates (NHPs) with fatality rates up to 90%. A number of experimental vaccine and treatment platforms have previously been shown to be protective against EBOV infection. However, the rate of development for prophylactics and therapeutics against MARV has been lower in comparison, possibly because a small-animal model is not widely available. Here we report the development of a mouse model for studying the pathogenesis of MARV Angola (MARV/Ang), the most virulent strain of MARV. Infection with the wild-type virus does not cause disease in mice, but the adapted virus (MARV/Ang-MA) recovered from liver homogenates after 24 serial passages in severe combined immunodeficient (SCID) mice caused severe disease when administered intranasally (i.n.) or intraperitoneally (i.p.). The median lethal dose (LD50) was determined to be 0.015 50% TCID50 (tissue culture infective dose) of MARV/Ang-MA in SCID mice, and i.p. infection at a dose of 1,000× LD50 resulted in death between 6 and 8 days postinfection in SCID mice. Similar results were obtained with immunocompetent BALB/c and C57BL/6 mice challenged i.p. with 2,000× LD50 of MARV/Ang-MA. Virological and pathological analyses of MARV/Ang-MA-infected BALB/c mice revealed that the associated pathology was reminiscent of observations made in NHPs with MARV/Ang. MARV/Ang-MA-infected mice showed most of the clinical hallmarks observed with Marburg hemorrhagic fever, including lymphopenia, thrombocytopenia, marked liver damage, and uncontrolled viremia. Virus titers reached 10(8) TCID50/ml in the blood and between 10(6) and 10(10) TCID50/g tissue in the intestines, kidney, lungs, brain, spleen, and liver. This model provides an important tool to screen candidate vaccines and therapeutics against MARV infections. IMPORTANCE The Angola strain of Marburg virus (MARV/Ang) was responsible for the largest outbreak ever documented for Marburg viruses. With a 90% fatality rate, it is similar to Ebola virus, which makes it one of the most lethal viruses known to humans. There are currently no approved interventions for Marburg virus, in part because a small-animal model that is vulnerable to MARV/Ang infection is not available to screen and test potential vaccines and therapeutics in a quick and economical manner. To address this need, we have adapted MARV/Ang so that it causes illness in mice resulting in death. The signs of disease in these mice are reminiscent of wild-type MARV/Ang infections in humans and nonhuman primates. We believe that this will be of help in accelerating the development of life-saving measures against Marburg virus infections.
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Damjanovic D, Khera A, Medina MF, Ennis J, Turner JD, Gauldie J, Xing Z. Type 1 interferon gene transfer enhances host defense against pulmonary Streptococcus pneumoniae infection via activating innate leukocytes. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2014; 1:5. [PMID: 26015944 PMCID: PMC4378291 DOI: 10.1038/mtm.2014.5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 01/29/2014] [Indexed: 11/11/2022]
Abstract
Pneumococcal infections are the leading cause of community-acquired pneumonia. Although the type 1 interferon-α (IFN-α) is a well-known antiviral cytokine, the role of IFN-α in antipneumococcal host defense and its therapeutic potential remain poorly understood. We have investigated these issues by using a murine transgene expression model. We found that in control animals, Streptococcus pneumoniae infection caused severe weight loss and excessive lung inflammation, associated with rapid bacterial outgrowth. In contrast, the animals that received a single dose of an adenoviral vector expressing IFN-α prior to pneumococcal infection demonstrated rapid and effective control of bacterial replication and lung inflammation and improved clinical outcome. Enhanced protection by IFN-α was due to increased activation of neutrophils and macrophages with increased release of reactive oxygen and nitrogen species and bacterial killing. Furthermore, we found that raised levels of IFN-α in the lung remained immune protective even when the gene transfer vector was given at a time postpneumococcal infection. Our study thus shows that the classically antiviral type 1 IFN can be exploited for enhancing immunity against pneumococcal infection via its activating effects on innate immune cells. Our findings hold implications for the therapeutic use of IFN-α gene transfer strategies to combat pneumococcal infections.
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Affiliation(s)
- Daniela Damjanovic
- McMaster Immunology Research Centre, Department of Pathology and Molecular Medicine, McMaster University , Hamilton, Ontario, Canada ; M.G. DeGroote Institute for Infectious Disease Research, McMaster University , Hamilton, Ontario, Canada
| | - Amandeep Khera
- McMaster Immunology Research Centre, Department of Pathology and Molecular Medicine, McMaster University , Hamilton, Ontario, Canada ; M.G. DeGroote Institute for Infectious Disease Research, McMaster University , Hamilton, Ontario, Canada
| | - Maria Fe Medina
- McMaster Immunology Research Centre, Department of Pathology and Molecular Medicine, McMaster University , Hamilton, Ontario, Canada ; M.G. DeGroote Institute for Infectious Disease Research, McMaster University , Hamilton, Ontario, Canada
| | | | | | - Jack Gauldie
- McMaster Immunology Research Centre, Department of Pathology and Molecular Medicine, McMaster University , Hamilton, Ontario, Canada ; M.G. DeGroote Institute for Infectious Disease Research, McMaster University , Hamilton, Ontario, Canada
| | - Zhou Xing
- McMaster Immunology Research Centre, Department of Pathology and Molecular Medicine, McMaster University , Hamilton, Ontario, Canada ; M.G. DeGroote Institute for Infectious Disease Research, McMaster University , Hamilton, Ontario, Canada
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11
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Smee DF, Wong MH, Hurst BL, Ennis J, Turner JD. Effects of nasal or pulmonary delivered treatments with an adenovirus vectored interferon (mDEF201) on respiratory and systemic infections in mice caused by cowpox and vaccinia viruses. PLoS One 2013; 8:e68685. [PMID: 23874722 PMCID: PMC3706414 DOI: 10.1371/journal.pone.0068685] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 05/31/2013] [Indexed: 11/19/2022] Open
Abstract
An adenovirus 5 vector encoding for mouse interferon alpha, subtype 5 (mDEF201) was evaluated for efficacy against lethal cowpox (Brighton strain) and vaccinia (WR strain) virus respiratory and systemic infections in mice. Two routes of mDEF201 administration were used, nasal sinus (5-µl) and pulmonary (50-µl), to compare differences in efficacy, since the preferred treatment of humans would be in a relatively small volume delivered intranasally. Lower respiratory infections (LRI), upper respiratory infections (URI), and systemic infections were induced by 50-µl intranasal, 10-µl intranasal, and 100-µl intraperitoneal virus challenges, respectively. mDEF201 treatments were given prophylactically either 24 h (short term) or 56d (long-term) prior to virus challenge. Single nasal sinus treatments of 10(6) and 10(7) PFU/mouse of mDEF201 protected all mice from vaccinia-induced LRI mortality (comparable to published studies with pulmonary delivered mDEF201). Systemic vaccinia infections responded significantly better to nasal sinus delivered mDEF201 than to pulmonary treatments. Cowpox LRI infections responded to 10(7) mDEF201 treatments, but a 10(6) dose was only weakly protective. Cowpox URI infections were equally treatable by nasal sinus and pulmonary delivered mDEF201 at 10(7) PFU/mouse. Dose-responsive prophylaxis with mDEF201, given one time only 56 d prior to initiating a vaccinia virus LRI infection, was 100% protective from 10(5) to 10(7) PFU/mouse. Improvements in lung hemorrhage score and lung weight were evident, as were decreases in liver, lung, and spleen virus titers. Thus, mDEF201 was able to treat different vaccinia and cowpox virus infections using both nasal sinus and pulmonary treatment regimens, supporting its development for humans.
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Affiliation(s)
- Donald F Smee
- Department of Animal, Dairy and Veterinary Sciences, Institute for Antiviral Research, Utah State University, Logan, Utah, United States of America.
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12
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Monoclonal antibodies combined with adenovirus-vectored interferon significantly extend the treatment window in Ebola virus-infected guinea pigs. J Virol 2013; 87:7754-7. [PMID: 23616649 DOI: 10.1128/jvi.00173-13] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Monoclonal antibodies (MAbs) are currently a promising treatment strategy against Ebola virus infection. This study combined MAbs with an adenovirus-vectored interferon (DEF201) to evaluate the efficacy in guinea pigs and extend the treatment window obtained with MAbs alone. Initiating the combination therapy at 3 days postinfection (d.p.i.) provided 100% survival, a significant improvement over survival with either treatment alone. The administration of DEF201 within 2 d.p.i. permits later MAb use, with protective efficacy observed up to 8 d.p.i.
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13
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Airway delivery of an adenovirus-based Ebola virus vaccine bypasses existing immunity to homologous adenovirus in nonhuman primates. J Virol 2013; 87:3668-77. [PMID: 23302894 DOI: 10.1128/jvi.02864-12] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Anti-adenovirus serotype 5 antibodies are capable of neutralizing adenovirus serotype 5-based vaccines. In mice and guinea pigs, intranasal delivery of adenovirus serotype 5-based vaccine bypasses induced adenovirus serotype 5 preexisting immunity, resulting in protection against species-adapted Ebola virus challenge. In this study, nonhuman primates were vaccinated with adenovirus serotype 5-based vaccine either intramuscularly or via the airway route (intranasally/intratracheally) in the presence or absence of adenovirus serotype 5 preexisting immunity. Immune responses were evaluated to determine the effect of both the vaccine delivery route and preexisting immunity before and after a lethal Ebola virus (Zaïre strain Kikwit 95) challenge. Intramuscular vaccination fully protected nonhuman primates in the absence of preexisting immunity, whereas the presence of preexisting immunity abrogated vaccine efficacy and resulted in complete mortality. In contrast, the presence of preexisting immunity to adenovirus serotype 5 did not alter the survival rate of nonhuman primates receiving the adenovirus serotype 5-based Ebola virus vaccine in the airway. This study shows that airway vaccination with adenovirus serotype 5-based Ebola virus vaccine can efficiently bypass preexisting immunity to adenovirus serotype 5 and induce protective immune responses, albeit at lower efficacy than that using an intramuscular vaccine delivery route.
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14
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Extended protection against phlebovirus infection conferred by recombinant adenovirus expressing consensus interferon (DEF201). Antimicrob Agents Chemother 2012; 56:4168-74. [PMID: 22615273 DOI: 10.1128/aac.00376-12] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Punta Toro virus (PTV; Bunyaviridae, Phlebovirus) is related to Rift Valley fever virus (RVFV), a pathogenic agent which causes severe disease in humans and livestock primarily in the sub-Saharan region of Africa. The recent range expansion of RVFV and the potential for its intentional release into naïve populations pose a significant threat to public health and agriculture. Studies modeling disease in rodents and nonhuman primates have shown that PTV and RVFV are highly sensitive to the antiviral effects of alpha interferon (IFN-α), an important component of the innate antiviral host response. While recombinant IFN-α has high therapeutic value, its utility for the treatment of neglected tropical diseases is hindered by its short in vivo half-life and costly production of longer-lasting pegylated IFNs. Here, we demonstrate extended preexposure protection against lethal PTV challenge following a single intranasal administration of DEF201, which is a replication-deficient human adenovirus type 5 vector engineered to constitutively express consensus IFN-α (cIFN-α) from transduced host cells. DEF201 was also efficacious when administered within 24 h as a postexposure countermeasure. Serum concentrations of cIFN-α could be detected as early as 8 h following treatment and persisted for more than 1 week. The prolonged antiphlebovirus prophylactic effect, low production costs, and ease of administration make DEF201 a promising agent for intervention during natural disease outbreaks and for countering possible bioterrorist acts.
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