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Janus BM, Wang R, Cleveland TE, Metcalf MC, Lemmer AC, van Dyk N, Jeong S, Astavans A, Class K, Fuerst TR, Ofek G. Macaque antibodies targeting Marburg virus glycoprotein induced by multivalent immunization. J Virol 2024; 98:e0015524. [PMID: 38832790 DOI: 10.1128/jvi.00155-24] [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: 01/23/2024] [Accepted: 05/07/2024] [Indexed: 06/05/2024] Open
Abstract
Marburg virus infection in humans is associated with case fatality rates that can reach up to 90%, but to date, there are no approved vaccines or monoclonal antibody (mAb) countermeasures. Here, we immunized Rhesus macaques with multivalent combinations of filovirus glycoprotein (GP) antigens belonging to Marburg, Sudan, and Ebola viruses to generate monospecific and cross-reactive antibody responses against them. From the animal that developed the highest titers of Marburg virus GP-specific neutralizing antibodies, we sorted single memory B cells using a heterologous Ravn virus GP probe and cloned and characterized a panel of 34 mAbs belonging to 28 unique lineages. Antibody specificities were assessed by overlapping pepscan and binding competition analyses, revealing that roughly a third of the lineages mapped to the conserved receptor binding region, including potent neutralizing lineages that were confirmed by negative stain electron microscopy to target this region. Additional lineages targeted a protective region on GP2, while others were found to possess cross-filovirus reactivity. Our study advances the understanding of orthomarburgvirus glycoprotein antigenicity and furthers efforts to develop candidate antibody countermeasures against these lethal viruses. IMPORTANCE Marburg viruses were the first filoviruses characterized to emerge in humans in 1967 and cause severe hemorrhagic fever with average case fatality rates of ~50%. Although mAb countermeasures have been approved for clinical use against the related Ebola viruses, there are currently no approved countermeasures against Marburg viruses. We successfully isolated a panel of orthomarburgvirus GP-specific mAbs from a macaque immunized with a multivalent combination of filovirus antigens. Our analyses revealed that roughly half of the antibodies in the panel mapped to regions on the glycoprotein shown to protect from infection, including the host cell receptor binding domain and a protective region on the membrane-anchoring subunit. Other antibodies in the panel exhibited broad filovirus GP recognition. Our study describes the discovery of a diverse panel of cross-reactive macaque antibodies targeting orthomarburgvirus and other filovirus GPs and provides candidate immunotherapeutics for further study and development.
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Affiliation(s)
- Benjamin M Janus
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland, USA
| | - Ruixue Wang
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland, USA
| | - Thomas E Cleveland
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland, USA
- Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA
| | - Matthew C Metcalf
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland, USA
| | - Aaron C Lemmer
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
| | - Nydia van Dyk
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland, USA
| | - Sarah Jeong
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland, USA
| | - Anagh Astavans
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
| | - Kenneth Class
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
| | - Thomas R Fuerst
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland, USA
| | - Gilad Ofek
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland, USA
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Felgner J, Clarke E, Hernandez-Davies JE, Jan S, Wirchnianski AS, Jain A, Nakajima R, Jasinskas A, Strahsburger E, Chandran K, Bradfute S, Davies DH. Broad antibody and T cell responses to Ebola, Sudan, and Bundibugyo ebolaviruses using mono- and multi-valent adjuvanted glycoprotein vaccines. Antiviral Res 2024; 225:105851. [PMID: 38458540 DOI: 10.1016/j.antiviral.2024.105851] [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: 10/10/2023] [Revised: 01/16/2024] [Accepted: 02/26/2024] [Indexed: 03/10/2024]
Abstract
Currently, there are two approved vaccine regimens designed to prevent Ebola virus (EBOV) disease (EVD). Both are virus-vectored, and concerns about cold-chain storage and pre-existing immunity to the vectors warrant investigating additional vaccine strategies. Here, we have explored the utility of adjuvanted recombinant glycoproteins (GPs) from ebolaviruses Zaire (EBOV), Sudan (SUDV), and Bundibugyo (BDBV) for inducing antibody (Ab) and T cell cross-reactivity. Glycoproteins expressed in insect cells were administered to C57BL/6 mice as free protein or bound to the surface of liposomes, and formulated with toll-like receptor agonists CpG and MPLA (agonists for TLR 9 and 4, respectively), with or without the emulsions AddaVax or TiterMax. The magnitude of Ab cross-reactivity in binding and neutralization assays, and T cell cross-reactivity in antigen recall assays, correlated with phylogenetic relatedness. While most adjuvants screened induced IgG responses, a combination of CpG, MPLA and AddaVax emulsion ("IVAX-1") was the most potent and polarized in an IgG2c (Th1) direction. Breadth was also achieved by combining GPs into a trivalent (Tri-GP) cocktail with IVAX-1, which did not compromise antibody responses to individual components in binding and neutralizing assays. Th1 signature cytokines in T cell recall assays were undetectable after Tri-GP/IVAX-1 administration, despite a robust IgG2c response, although administration of Tri-GP on lipid nanoparticles in IVAX-1 elevated Th1 cytokines to detectable levels. Overall, the data indicate an adjuvanted trivalent recombinant GP approach may represent a path toward a broadly reactive, deployable vaccine against EVD.
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Affiliation(s)
- Jiin Felgner
- Vaccine Research & Development Center, University of California Irvine, USA
| | - Elizabeth Clarke
- Center for Global Health, Department of Internal Medicine, University of New Mexico, USA
| | | | - Sharon Jan
- Vaccine Research & Development Center, University of California Irvine, USA
| | - Ariel S Wirchnianski
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, USA
| | - Aarti Jain
- Vaccine Research & Development Center, University of California Irvine, USA
| | - Rie Nakajima
- Vaccine Research & Development Center, University of California Irvine, USA
| | | | - Erwin Strahsburger
- Vaccine Research & Development Center, University of California Irvine, USA
| | - Kartik Chandran
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, USA
| | - Steven Bradfute
- Center for Global Health, Department of Internal Medicine, University of New Mexico, USA
| | - D Huw Davies
- Vaccine Research & Development Center, University of California Irvine, USA.
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3
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Hamer MJ, Houser KV, Hofstetter AR, Ortega-Villa AM, Lee C, Preston A, Augustine B, Andrews C, Yamshchikov GV, Hickman S, Schech S, Hutter JN, Scott PT, Waterman PE, Amare MF, Kioko V, Storme C, Modjarrad K, McCauley MD, Robb ML, Gaudinski MR, Gordon IJ, Holman LA, Widge AT, Strom L, Happe M, Cox JH, Vazquez S, Stanley DA, Murray T, Dulan CNM, Hunegnaw R, Narpala SR, Swanson PA, Basappa M, Thillainathan J, Padilla M, Flach B, O'Connell S, Trofymenko O, Morgan P, Coates EE, Gall JG, McDermott AB, Koup RA, Mascola JR, Ploquin A, Sullivan NJ, Ake JA, Ledgerwood JE. Safety, tolerability, and immunogenicity of the chimpanzee adenovirus type 3-vectored Marburg virus (cAd3-Marburg) vaccine in healthy adults in the USA: a first-in-human, phase 1, open-label, dose-escalation trial. Lancet 2023; 401:294-302. [PMID: 36709074 PMCID: PMC10127441 DOI: 10.1016/s0140-6736(22)02400-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/14/2022] [Accepted: 11/15/2022] [Indexed: 01/27/2023]
Abstract
BACKGROUND WHO has identified Marburg virus as an emerging virus requiring urgent vaccine research and development, particularly due to its recent emergence in Ghana. We report results from a first-in-human clinical trial evaluating a replication-deficient recombinant chimpanzee adenovirus type 3 (cAd3)-vectored vaccine encoding a wild-type Marburg virus Angola glycoprotein (cAd3-Marburg) in healthy adults. METHODS We did a first-in-human, phase 1, open-label, dose-escalation trial of the cAd3-Marburg vaccine at the Walter Reed Army Institute of Research Clinical Trials Center in the USA. Healthy adults aged 18-50 years were assigned to receive a single intramuscular dose of cAd3-Marburg vaccine at either 1 × 1010 or 1 × 1011 particle units (pu). Primary safety endpoints included reactogenicity assessed for the first 7 days and all adverse events assessed for 28 days after vaccination. Secondary immunogenicity endpoints were assessment of binding antibody responses and T-cell responses against the Marburg virus glycoprotein insert, and assessment of neutralising antibody responses against the cAd3 vector 4 weeks after vaccination. This study is registered with ClinicalTrials.gov, NCT03475056. FINDINGS Between Oct 9, 2018, and Jan 31, 2019, 40 healthy adults were enrolled and assigned to receive a single intramuscular dose of cAd3-Marburg vaccine at either 1 × 1010 pu (n=20) or 1 × 1011 pu (n=20). The cAd3-Marburg vaccine was safe, well tolerated, and immunogenic. All enrolled participants received cAd3-Marburg vaccine, with 37 (93%) participants completing follow-up visits; two (5%) participants moved from the area and one (3%) was lost to follow-up. No serious adverse events related to vaccination occurred. Mild to moderate reactogenicity was observed after vaccination, with symptoms of injection site pain and tenderness (27 [68%] of 40 participants), malaise (18 [45%] of 40 participants), headache (17 [43%] of 40 participants), and myalgia (14 [35%] of 40 participants) most commonly reported. Glycoprotein-specific antibodies were induced in 38 (95%) of 40 participants 4 weeks after vaccination, with geometric mean titres of 421 [95% CI 209-846] in the 1 × 1010 pu group and 545 [276-1078] in the 1 × 1011 pu group, and remained significantly elevated at 48 weeks compared with baseline titres (39 [95% CI 13-119] in the 1 ×1010 pu group and 27 [95-156] in the 1 ×1011 pu group; both p<0·0001). T-cell responses to the glycoprotein insert and neutralising responses against the cAd3 vector were also increased at 4 weeks after vaccination. INTERPRETATION This first-in-human trial of this cAd3-Marburg vaccine showed the agent is safe and immunogenic, with a safety profile similar to previously tested cAd3-vectored filovirus vaccines. 95% of participants produced a glycoprotein-specific antibody response at 4 weeks after a single vaccination, which remained in 70% of participants at 48 weeks. These findings represent a crucial step in the development of a vaccine for emergency deployment against a re-emerging pathogen that has recently expanded its reach to new regions. FUNDING National Institutes of Health.
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Affiliation(s)
- Melinda J Hamer
- Walter Reed Army Institute of Research, Silver Spring, MD, USA; Department of Emergency Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC, USA
| | - Katherine V Houser
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
| | - Amelia R Hofstetter
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Ana M Ortega-Villa
- Biostatistics Research Branch, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Christine Lee
- Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Anne Preston
- Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | | | - Charla Andrews
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Galina V Yamshchikov
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Somia Hickman
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Steven Schech
- Henry M Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA
| | - Jack N Hutter
- Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Paul T Scott
- Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | | | - Mihret F Amare
- Henry M Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA
| | - Victoria Kioko
- Henry M Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA
| | - Casey Storme
- Henry M Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA
| | | | - Melanie D McCauley
- Henry M Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA
| | - Merlin L Robb
- Henry M Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA
| | - Martin R Gaudinski
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Ingelise J Gordon
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - LaSonji A Holman
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Alicia T Widge
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Larisa Strom
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Myra Happe
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Josephine H Cox
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Sandra Vazquez
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Daphne A Stanley
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Tamar Murray
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Caitlyn N M Dulan
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Ruth Hunegnaw
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Sandeep R Narpala
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Phillip A Swanson
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Manjula Basappa
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Jagada Thillainathan
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Marcelino Padilla
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Britta Flach
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Sarah O'Connell
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Olga Trofymenko
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Patricia Morgan
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Emily E Coates
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Jason G Gall
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Adrian B McDermott
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Richard A Koup
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - John R Mascola
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Aurélie Ploquin
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Nancy J Sullivan
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Julie A Ake
- Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Julie E Ledgerwood
- Vaccine Research Center, and Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
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Abstract
Lassa Fever (LF) is a viral hemorrhagic fever endemic in West Africa. LF begins with flu-like symptoms that are difficult to distinguish from other common endemic diseases such as malaria, dengue, and yellow fever making it hard to diagnose clinically. Availability of a rapid diagnostic test and other serological and molecular assays facilitates accurate diagnosis of LF. Lassa virus therapeutics are currently in different stages of preclinical development. Arevirumab, a cocktail of monoclonal antibodies, demonstrates a great safety and efficacy profile in non-human primates. Major efforts have been made in the development of a Lassa virus vaccine. Two vaccine candidates, MeV-NP and pLASV-GPC are undergoing evaluation in phase I clinical trials.
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Affiliation(s)
- Lilia I Melnik
- Department of Microbiology and Immunology, Tulane University School of Medicine, 1430 Tulane Avenue, New Orleans, LA, 70118, USA.
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5
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Bi J, Wang H, Pei H, Han Q, Feng N, Wang Q, Wang X, Wang Z, Wei S, Ge L, Wu M, Liang H, Yang S, Yan F, Zhao Y, Xia X. A Novel and Secure Pseudovirus Reporter System Based Assay for Neutralizing and Enhancing Antibody Assay Against Marburg Virus. Front Microbiol 2022; 13:927122. [PMID: 35756049 PMCID: PMC9224600 DOI: 10.3389/fmicb.2022.927122] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Accepted: 05/17/2022] [Indexed: 11/29/2022] Open
Abstract
Marburg virus (MARV) is one of the principal members of the filovirus family, which can cause fatal hemorrhagic fever in humans. There are currently no prophylactic and therapeutic drugs on the market, and the high pathogenicity and infectivity of MARV make its research highly dependent on biosafety level 4 conditions, severely hindering the development of vaccines and therapies. Therefore, the development of medicines, such as MARV serological diagnosis, vaccines, and therapeutic antibody drugs, urgently needs a safe, convenient, and biosafety level 2 detection method to measure the neutralizing activity of MARV antibodies. To this end, we report a neutralization assay relying on a Rabies virus (RABV) reverse genetic operating system. We constructed infectious clones carrying the eGFP reporter gene and the full length of the original unmodified MARV GP gene. Based on the critical parameters of phylogenetic analysis, recombinant viruses targeting representative strains in the two major MARV lineages were successfully rescued. These pseudoviruses are safe in mice, and their inability to infect cells after being neutralized by antibodies can be visualized under a fluorescence microscope. We tested the system using the neutralizing antibody MR191. MR191 can significantly block the infection of BSR cells with pseudovirus. We compared it with the traditional lentivirus-type pseudovirus system to verify the system’s credibility and obtained the same results as reported in the literature. In general, we have established a safe and visualized method for evaluating the neutralizing activity of MARV antibodies. Compared with traditional methods, it has the advantages of convenient operation, short cycle, and low cost. It is a candidate method that can replace actual viruses for a neutralization assay.
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Affiliation(s)
- Jinhao Bi
- College of Veterinary Medicine, Jilin Agricultural University, Changchun, China.,Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Haojie Wang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China.,College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang, China
| | - Hongyan Pei
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China.,College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
| | - Qiuxue Han
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China.,Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) and Comparative Medicine Center, Peking Union Medical College (PUMC), Beijing, China
| | - Na Feng
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Qi Wang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China.,College of Animal Science and Technology, Shihezi University, Shihezi, China
| | - Xinyue Wang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China.,College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Zhenshan Wang
- College of Veterinary Medicine, Jilin Agricultural University, Changchun, China.,Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Shimeng Wei
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China.,Guangzhou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Guangzhou, China
| | - Liangpeng Ge
- Chongqing Academy of Animal Sciences, Chongqing, China
| | - Meng Wu
- Chongqing Academy of Animal Sciences, Chongqing, China
| | - Hao Liang
- Chongqing Academy of Animal Sciences, Chongqing, China
| | - Songtao Yang
- College of Veterinary Medicine, Jilin Agricultural University, Changchun, China.,Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Feihu Yan
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Yongkun Zhao
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Xianzhu Xia
- College of Veterinary Medicine, Jilin Agricultural University, Changchun, China.,Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China.,Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) and Comparative Medicine Center, Peking Union Medical College (PUMC), Beijing, China.,College of Animal Science and Technology, Shihezi University, Shihezi, China.,College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
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6
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Sullivan E, Sung PY, Wu W, Berry N, Kempster S, Ferguson D, Almond N, Jones IM, Roy P. SARS-CoV-2 Virus-Like Particles Produced by a Single Recombinant Baculovirus Generate Anti-S Antibody and Protect against Variant Challenge. Viruses 2022; 14:v14050914. [PMID: 35632656 PMCID: PMC9143203 DOI: 10.3390/v14050914] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/23/2022] [Accepted: 04/26/2022] [Indexed: 01/27/2023] Open
Abstract
Coronavirus Disease 2019 (COVID-19), caused by infection with Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), has highlighted the need for the rapid generation of efficient vaccines for emerging disease. Virus-like particles, VLPs, are an established vaccine technology that produces virus-like mimics, based on expression of the structural proteins of a target virus. SARS-CoV-2 is a coronavirus where the basis of VLP formation has been shown to be the co-expression of the spike, membrane and envelope structural proteins. Here we describe the generation of SARS-CoV-2 VLPs by the co-expression of the salient structural proteins in insect cells using the established baculovirus expression system. VLPs were heterologous ~100 nm diameter enveloped particles with a distinct fringe that reacted strongly with SARS-CoV-2 convalescent sera. In a Syrian hamster challenge model, non-adjuvanted VLPs induced neutralizing antibodies to the VLP-associated Wuhan S protein and reduced virus shedding and protected against disease associated weight loss following a virulent challenge with SARS-CoV-2 (B.1.1.7 variant). Immunized animals showed reduced lung pathology and lower challenge virus replication than the non-immunized controls. Our data suggest SARS-CoV-2 VLPs offer an efficient vaccine that mitigates against virus load and prevents severe disease.
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Affiliation(s)
- Edward Sullivan
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK; (E.S.); (P.-Y.S.); (W.W.)
| | - Po-Yu Sung
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK; (E.S.); (P.-Y.S.); (W.W.)
| | - Weining Wu
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK; (E.S.); (P.-Y.S.); (W.W.)
| | - Neil Berry
- Division of Infectious Disease Diagnostics, National Institute for Biological Standards and Control, Potters Bar EN6 3QG, UK; (N.B.); (S.K.); (D.F.); (N.A.)
| | - Sarah Kempster
- Division of Infectious Disease Diagnostics, National Institute for Biological Standards and Control, Potters Bar EN6 3QG, UK; (N.B.); (S.K.); (D.F.); (N.A.)
| | - Deborah Ferguson
- Division of Infectious Disease Diagnostics, National Institute for Biological Standards and Control, Potters Bar EN6 3QG, UK; (N.B.); (S.K.); (D.F.); (N.A.)
| | - Neil Almond
- Division of Infectious Disease Diagnostics, National Institute for Biological Standards and Control, Potters Bar EN6 3QG, UK; (N.B.); (S.K.); (D.F.); (N.A.)
| | - Ian M. Jones
- School of Biological Sciences, University of Reading, Reading RG6 6AH, UK;
| | - Polly Roy
- Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK; (E.S.); (P.-Y.S.); (W.W.)
- Correspondence: ; Tel.: +44-(0)20-7927-2324
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7
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Ebola Virus Disease, Diagnostics and Therapeutics: Where is the Consensus in Over Three Decades of Clinical Research? SCIENTIFIC AFRICAN 2021. [DOI: 10.1016/j.sciaf.2021.e00862] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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8
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He L, Chaudhary A, Lin X, Sou C, Alkutkar T, Kumar S, Ngo T, Kosviner E, Ozorowski G, Stanfield RL, Ward AB, Wilson IA, Zhu J. Single-component multilayered self-assembling nanoparticles presenting rationally designed glycoprotein trimers as Ebola virus vaccines. Nat Commun 2021; 12:2633. [PMID: 33976149 DOI: 10.1101/2020.08.22.262634] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 04/06/2021] [Indexed: 05/27/2023] Open
Abstract
Ebola virus (EBOV) glycoprotein (GP) can be recognized by neutralizing antibodies (NAbs) and is the main target for vaccine design. Here, we first investigate the contribution of the stalk and heptad repeat 1-C (HR1C) regions to GP metastability. Specific stalk and HR1C modifications in a mucin-deleted form (GPΔmuc) increase trimer yield, whereas alterations of HR1C exert a more complex effect on thermostability. Crystal structures are determined to validate two rationally designed GPΔmuc trimers in their unliganded state. We then display a modified GPΔmuc trimer on reengineered protein nanoparticles that encapsulate a layer of locking domains (LD) and a cluster of helper T-cell epitopes. In mice and rabbits, GP trimers and nanoparticles elicit cross-ebolavirus NAbs, as well as non-NAbs that enhance pseudovirus infection. Repertoire sequencing reveals quantitative profiles of vaccine-induced B-cell responses. This study demonstrates a promising vaccine strategy for filoviruses, such as EBOV, based on GP stabilization and nanoparticle display.
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MESH Headings
- Animals
- Antibodies, Neutralizing/blood
- Antibodies, Neutralizing/immunology
- Antigens, Viral/administration & dosage
- Antigens, Viral/genetics
- Antigens, Viral/immunology
- Antigens, Viral/ultrastructure
- B-Lymphocytes/immunology
- Crystallography, X-Ray
- Disease Models, Animal
- Ebola Vaccines/administration & dosage
- Ebola Vaccines/genetics
- Ebola Vaccines/immunology
- Ebolavirus/genetics
- Ebolavirus/immunology
- Epitopes, T-Lymphocyte/administration & dosage
- Epitopes, T-Lymphocyte/genetics
- Epitopes, T-Lymphocyte/immunology
- Epitopes, T-Lymphocyte/ultrastructure
- Female
- Glycoproteins/administration & dosage
- Glycoproteins/genetics
- Glycoproteins/immunology
- Glycoproteins/ultrastructure
- Hemorrhagic Fever, Ebola/blood
- Hemorrhagic Fever, Ebola/immunology
- Hemorrhagic Fever, Ebola/therapy
- Hemorrhagic Fever, Ebola/virology
- Humans
- Mice
- Nanoparticles/chemistry
- Protein Domains/genetics
- Protein Domains/immunology
- Protein Engineering
- Protein Multimerization/genetics
- Protein Multimerization/immunology
- Protein Stability
- Rabbits
- T-Lymphocytes, Helper-Inducer/immunology
- Vaccines, Subunit/administration & dosage
- Vaccines, Subunit/genetics
- Vaccines, Subunit/immunology
- Viral Proteins/administration & dosage
- Viral Proteins/genetics
- Viral Proteins/immunology
- Viral Proteins/ultrastructure
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Affiliation(s)
- Linling He
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Anshul Chaudhary
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Xiaohe Lin
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Cindy Sou
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Tanwee Alkutkar
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Sonu Kumar
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Timothy Ngo
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Ezra Kosviner
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Gabriel Ozorowski
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Robyn L Stanfield
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Andrew B Ward
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Ian A Wilson
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA.
- Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA, USA.
| | - Jiang Zhu
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA.
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA, USA.
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9
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He L, Chaudhary A, Lin X, Sou C, Alkutkar T, Kumar S, Ngo T, Kosviner E, Ozorowski G, Stanfield RL, Ward AB, Wilson IA, Zhu J. Single-component multilayered self-assembling nanoparticles presenting rationally designed glycoprotein trimers as Ebola virus vaccines. Nat Commun 2021; 12:2633. [PMID: 33976149 PMCID: PMC8113551 DOI: 10.1038/s41467-021-22867-w] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 04/06/2021] [Indexed: 12/17/2022] Open
Abstract
Ebola virus (EBOV) glycoprotein (GP) can be recognized by neutralizing antibodies (NAbs) and is the main target for vaccine design. Here, we first investigate the contribution of the stalk and heptad repeat 1-C (HR1C) regions to GP metastability. Specific stalk and HR1C modifications in a mucin-deleted form (GPΔmuc) increase trimer yield, whereas alterations of HR1C exert a more complex effect on thermostability. Crystal structures are determined to validate two rationally designed GPΔmuc trimers in their unliganded state. We then display a modified GPΔmuc trimer on reengineered protein nanoparticles that encapsulate a layer of locking domains (LD) and a cluster of helper T-cell epitopes. In mice and rabbits, GP trimers and nanoparticles elicit cross-ebolavirus NAbs, as well as non-NAbs that enhance pseudovirus infection. Repertoire sequencing reveals quantitative profiles of vaccine-induced B-cell responses. This study demonstrates a promising vaccine strategy for filoviruses, such as EBOV, based on GP stabilization and nanoparticle display. Ebola virus glycoprotein (GP) is a major target for vaccine design. Here, the authors identify mutations to improve GP stability and yield, design two multilayered nanoparticle carriers, and demonstrate good immunogenicity of the modified GP on nanoparticles in mice and rabbits.
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Affiliation(s)
- Linling He
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Anshul Chaudhary
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Xiaohe Lin
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Cindy Sou
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Tanwee Alkutkar
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Sonu Kumar
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Timothy Ngo
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Ezra Kosviner
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Gabriel Ozorowski
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Robyn L Stanfield
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Andrew B Ward
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Ian A Wilson
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA. .,Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA, USA.
| | - Jiang Zhu
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA. .,Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA, USA.
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10
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Malherbe DC, Domi A, Hauser MJ, Meyer M, Gunn BM, Alter G, Bukreyev A, Guirakhoo F. Modified vaccinia Ankara vaccine expressing Marburg virus-like particles protects guinea pigs from lethal Marburg virus infection. NPJ Vaccines 2020; 5:78. [PMID: 32922962 PMCID: PMC7468113 DOI: 10.1038/s41541-020-00226-y] [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: 03/23/2020] [Accepted: 07/07/2020] [Indexed: 11/17/2022] Open
Abstract
We introduce a new vaccine platform against Marburg virus (MARV) combining the advantages of the immunogenicity of a highly attenuated vaccine vector (Modified Vaccinia Ankara, MVA) with the authentic conformation of virus-like particles (VLPs). Our vaccine, MVA–MARV–VLP, expresses the minimal components of MARV VLPs: the envelope glycoprotein GP and the matrix protein VP40. Electron microscopy confirmed self-assembly and budding of VLPs from infected cells. Prime/boost vaccination of guinea pigs with MVA–MARV–VLP-elicited MARV-specific binding and neutralizing antibody responses. Vaccination also induced Fc-mediated innate immune effector functions including activation of NK cells and antibody-dependent phagocytosis by neutrophils and monocytes. Inoculation of vaccinated animals with guinea pig-adapted MARV demonstrated 100% protection against death and disease with no viremia. Therefore, our vaccine platform, expressing two antigens resulting in assembly of VLPs in the native conformation in vaccinated hosts, can be used as a potent vaccine against MARV.
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Affiliation(s)
- Delphine C Malherbe
- Department of Pathology, University of Texas Medical Branch, Galveston, TX USA.,Galveston National Laboratory, Galveston, TX USA
| | | | | | - Michelle Meyer
- Department of Pathology, University of Texas Medical Branch, Galveston, TX USA.,Galveston National Laboratory, Galveston, TX USA
| | - Bronwyn M Gunn
- Ragon Institute of MGH, MIT, and Harvard, Cambridge, MA USA
| | - Galit Alter
- Ragon Institute of MGH, MIT, and Harvard, Cambridge, MA USA
| | - Alexander Bukreyev
- Department of Pathology, University of Texas Medical Branch, Galveston, TX USA.,Galveston National Laboratory, Galveston, TX USA.,Department of Microbiology & Immunology, University of Texas Medical Branch, Galveston, TX USA
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11
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Protective Immunity Induced by Virus-Like Particle Containing Merozoite Surface Protein 9 of Plasmodium berghei. Vaccines (Basel) 2020; 8:vaccines8030428. [PMID: 32751598 PMCID: PMC7564927 DOI: 10.3390/vaccines8030428] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 07/22/2020] [Accepted: 07/27/2020] [Indexed: 12/26/2022] Open
Abstract
Merozoite surface protein 9 (MSP-9) from Plasmodium has shown promise as a vaccine candidate due to its location and possible role in erythrocyte invasion. In this study, we generated virus-like particles (VLPs) targeting P. berghei MSP-9, and investigated the protection against lethal doses of P. berghei in a mouse model. We found that VLP vaccination induced a P. berghei-specific IgG antibody response in the sera and CD4+ and CD8+ T cell populations in blood compared to a naïve control group. Upon challenge infection with P. berghei, vaccinated mice showed a significant increase in CD4+ and CD8+ effector memory T cell and memory B cell populations. Importantly, MSP-9 VLP immunization inhibited levels of the pro-inflammatory cytokines IFN-γ and IL-6 in the spleen and parasite replication in blood, resulting in significantly prolonged survival time. These results suggest that the MSP-9 VLP vaccine may constitute an effective malaria vaccine.
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12
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Abstract
Since its discovery in 1976, Ebola virus (EBOV) has caused numerous outbreaks of fatal hemorrhagic disease in Africa. The biggest outbreak on record is the 2013-2016 epidemic in west Africa with almost 30,000 cases and over 11,000 fatalities, devastatingly affecting Guinea, Liberia, and Sierra Leone. The epidemic highlighted the need for licensed drugs or vaccines to quickly combat the disease. While at the beginning of the epidemic no licensed countermeasures were available, several experimental drugs with preclinical efficacy were accelerated into human clinical trials and used to treat patients with Ebola virus disease (EVD) toward the end of the epidemic. In the same manner, vaccines with preclinical efficacy were administered primarily to known contacts of EVD patients on clinical trial protocols using a ring-vaccination strategy. In this review, we describe the pathogenesis of EBOV and summarize the current status of EBOV vaccine development and treatment of EVD.
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Affiliation(s)
- Wakako Furuyama
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana 59840, USA;
| | - Andrea Marzi
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana 59840, USA;
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13
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Identification of Novel Adjuvants for Ebola Virus-Like Particle Vaccine. Vaccines (Basel) 2020; 8:vaccines8020215. [PMID: 32397625 PMCID: PMC7349346 DOI: 10.3390/vaccines8020215] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/03/2020] [Accepted: 05/05/2020] [Indexed: 11/16/2022] Open
Abstract
Ebola virus disease is a severe disease, often fatal, with a mortality rate of up to 90%. Presently, effective treatment and safe prevention options for Ebola virus disease are not available. Therefore, there is an urgent need to develop control measures to prevent or limit future Ebola virus outbreaks. Ebola virus protein-based virus-like particle (VLP) and inactivated whole virion vaccines have demonstrated efficacy in animal models, and the addition of appropriate adjuvants may provide additional benefits to these vaccines, including enhanced immune responses. In this study, we screened 24 compounds from injectable excipients approved for human use in Japan and identified six compounds that significantly enhanced the humoral response to Ebola VLP vaccine in a murine model. Our novel adjuvant candidates for Ebola VLP vaccine have already been demonstrated to be safe when administered intramuscularly or subcutaneously, and therefore, they are closer to clinical trials than adjuvants whose safety profiles are unknown.
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14
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A Bivalent, Spherical Virus-Like Particle Vaccine Enhances Breadth of Immune Responses against Pathogenic Ebola Viruses in Rhesus Macaques. J Virol 2020; 94:JVI.01884-19. [PMID: 32075939 DOI: 10.1128/jvi.01884-19] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 02/13/2020] [Indexed: 12/16/2022] Open
Abstract
The 2013-2016 Ebola outbreak in West Africa led to accelerated efforts to develop vaccines against these highly virulent viruses. A live, recombinant vesicular stomatitis virus-based vaccine has been deployed in outbreak settings and appears highly effective. Vaccines based on replication-deficient adenovirus vectors either alone or in combination with a multivalent modified vaccinia Ankara (MVA) Ebola vaccine also appear promising and are progressing in clinical evaluation. However, the ability of current live vector-based approaches to protect against multiple pathogenic species of Ebola is not yet established, and eliciting durable responses may require additional booster vaccinations. Here, we report the development of a bivalent, spherical Ebola virus-like particle (VLP) vaccine that incorporates glycoproteins (GPs) from Zaire Ebola virus (EBOV) and Sudan Ebola virus (SUDV) and is designed to extend the breadth of immunity beyond EBOV. Immunization of rabbits with bivalent Ebola VLPs produced antibodies that neutralized all four pathogenic species of Ebola viruses and elicited antibody-dependent cell-mediated cytotoxicity (ADCC) responses against EBOV and SUDV. Vaccination of rhesus macaques with bivalent VLPs generated strong humoral immune responses, including high titers of binding, as well as neutralizing antibodies and ADCC responses. VLP vaccination led to a significant increase in the frequency of Ebola GP-specific CD4 and CD8 T cell responses. These results demonstrate that a novel bivalent Ebola VLP vaccine elicits strong humoral and cellular immune responses against pathogenic Ebola viruses and support further evaluation of this approach as a potential addition to Ebola vaccine development efforts.IMPORTANCE Ebola outbreaks result in significant morbidity and mortality in affected countries. Although several leading candidate Ebola vaccines have been developed and advanced in clinical testing, additional vaccine candidates may be needed to provide protection against different Ebola species and to extend the durability of protection. A novel approach demonstrated here is to express two genetically diverse glycoproteins on a spherical core, generating a vaccine that can broaden immune responses against known pathogenic Ebola viruses. This approach provides a new method to broaden and potentially extend protective immune responses against Ebola viruses.
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15
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Lei X, Cai X, Yang Y. Genetic engineering strategies for construction of multivalent chimeric VLPs vaccines. Expert Rev Vaccines 2020; 19:235-246. [PMID: 32133886 DOI: 10.1080/14760584.2020.1738227] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Introduction: Over the past two decades, virus-like particles (VLPs) have been developed as a new generation of vaccines against viral infections. Based on VLPs, chimeric VLPs (chi-VLPs) have been generated through genetic modifications or chemical couplings. For construction of multivalent chi-VLPs vaccines, multiple genetic engineering strategies are continuously being developed. Thus, it is important to provide a summary as reference for researchers in this field.Areas covered: The representative studies on the genetic engineered multivalent chi-VLPs are summarized and mainly focused on chimeric capsid VLPs and chimeric enveloped VLPs. The advantages and limitations of each strategy are also discussed at last, as well as opinions on platform choice and future directions of eVLPs vaccines.Expert opinion: The design of multivalent chi-VLPs vaccines needs to meet the following specifications: 1) the incorporated antigens are suggested to display on the exposed surface of chi-VLPs and do not have excessive adverse effects on the stability of chi-VLPs; 2) the chi-VLPs should elicit protective antibodies against the incorporated antigen as well as the source virus of VLPs. However, there is no requirement of retaining the antigenicity of VLPs when using VLPs solely as carriers for antigens display or drug delivery.
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Affiliation(s)
- Xinnuo Lei
- Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center of Reverse Vaccinology (RCRV), Hunan Agricultural University, Changsha, Hunan, China.,Laboratory of Functional Proteomics (LFP), College of Veterinary Medicine, Hunan Agricultural University, Changsha, Hunan, China
| | - Xiong Cai
- Institute of Innovation and Applied Research in Chinese Medicine, Hunan University of Chinese Medicine, Changsha, Hunan, China
| | - Yi Yang
- Provincial Key Laboratory of Protein Engineering in Animal Vaccines, Research Center of Reverse Vaccinology (RCRV), Hunan Agricultural University, Changsha, Hunan, China.,Laboratory of Functional Proteomics (LFP), College of Veterinary Medicine, Hunan Agricultural University, Changsha, Hunan, China
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Abstract
Animal cell culture technology in today’s scenario has become indispensable in the field of life sciences, which provides a basis to study regulation, proliferation, and differentiation and to perform genetic manipulation. It requires specific technical skills to carry out successfully. This chapter describes the essential techniques of animal cell culture as well as its applications.
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Affiliation(s)
- Anju Verma
- Department of Plant Pathology, Institute of Plant Breeding Genetics & Genomics, Center for Applied Genetic Technologies, University of Georgia, Athens, GA, United States
| | - Megha Verma
- College of Arts and Sciences, St. Louis, MO, United States
| | - Anchal Singh
- Department of Biochemistry, Institute of Science, Banaras Hindu University, Varanasi, UP, India
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17
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Suschak JJ, Schmaljohn CS. Vaccines against Ebola virus and Marburg virus: recent advances and promising candidates. Hum Vaccin Immunother 2019; 15:2359-2377. [PMID: 31589088 DOI: 10.1080/21645515.2019.1651140] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The filoviruses Ebola virus and Marburg virus are among the most dangerous pathogens in the world. Both viruses cause viral hemorrhagic fever, with case fatality rates of up to 90%. Historically, filovirus outbreaks had been relatively small, with only a few hundred cases reported. However, the recent West African Ebola virus outbreak underscored the threat that filoviruses pose. The three year-long outbreak resulted in 28,646 Ebola virus infections and 11,323 deaths. The lack of Food and Drug Administration (FDA) licensed vaccines and antiviral drugs hindered early efforts to contain the outbreak. In response, the global scientific community has spurred the advanced development of many filovirus vaccine candidates. Novel vaccine platforms, such as viral vectors and DNA vaccines, have emerged, leading to the investigation of candidate vaccines that have demonstrated protective efficacy in small animal and nonhuman primate studies. Here, we will discuss several of these vaccine platforms with a particular focus on approaches that have advanced into clinical development.
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Affiliation(s)
- John J Suschak
- Virology Division, U.S. Army Medical Research Institute of Infectious Diseases , Fort Detrick , MD , USA
| | - Connie S Schmaljohn
- Headquarters Division, U.S. Army Medical Research Institute of Infectious Diseases , Fort Detrick , MD , USA
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18
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Glucopyranosyl lipid adjuvant enhances immune response to Ebola virus-like particle vaccine in mice. Vaccine 2019; 37:3902-3910. [PMID: 31174937 DOI: 10.1016/j.vaccine.2019.05.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 04/26/2019] [Accepted: 05/09/2019] [Indexed: 11/20/2022]
Abstract
The identification of adjuvants that promote lasting antigen-specific immunity and augment vaccine efficacy are integral to the development of new protein-based vaccines. The Ebola virus-like particle (VLP) vaccine expressing Ebola virus glycoprotein (GP) and matrix protein (VP40) was used in this study to evaluate the ability of TLR4 agonist glucopyranosyl lipid adjuvant (GLA) formulated in a stable emulsion (SE) to enhance immunogenicity and promote durable protection against mouse-adapted Ebola virus (ma-EBOV). Antibody responses and Ebola-specific T cell responses were evaluated post vaccination. Survival analysis after lethal ma-EBOV challenge was performed 4 weeks and 22 weeks following final vaccination. GLA-SE enhanced EBOV-specific immunity and resulted in long-term protection against challenge with ma-EBOV infection in a mouse model. Specifically, GLA-SE elicited Th1-skewed antibodies and promoted the generation of EBOV GP-specific polyfunctional T cells. These results provide further support for the utility of TLR4 activating GLA-SE-adjuvanted vaccines.
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19
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Abstract
This chapter reviews our current knowledge about the spatiotemporal assembly of filoviral particles. We will follow particles from nucleocapsid entry into the cytoplasm until the nucleocapsids are enveloped at the plasma membrane. We will also highlight the currently open scientific questions surrounding filovirus assembly.
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20
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Antibody-Mediated Protective Mechanisms Induced by a Trivalent Parainfluenza Virus-Vectored Ebolavirus Vaccine. J Virol 2019; 93:JVI.01845-18. [PMID: 30518655 DOI: 10.1128/jvi.01845-18] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 11/23/2018] [Indexed: 01/03/2023] Open
Abstract
Ebolaviruses Zaire (EBOV), Bundibugyo (BDBV), and Sudan (SUDV) cause human disease with high case fatality rates. Experimental monovalent vaccines, which all utilize the sole envelope glycoprotein (GP), do not protect against heterologous ebolaviruses. Human parainfluenza virus type 3-vectored vaccines offer benefits, including needle-free administration and induction of mucosal responses in the respiratory tract. Multiple approaches were taken to induce broad protection against the three ebolaviruses. While GP consensus-based antigens failed to elicit neutralizing antibodies, polyvalent vaccine immunization induced neutralizing responses to all three ebolaviruses and protected animals from death and disease caused by EBOV, SUDV, and BDBV. As immunization with a cocktail of antigenically related antigens can skew the responses and change the epitope hierarchy, we performed comparative analysis of antibody repertoire and Fc-mediated protective mechanisms in animals immunized with monovalent versus polyvalent vaccines. Compared to sera from guinea pigs receiving the monovalent vaccines, sera from guinea pigs receiving the trivalent vaccine bound and neutralized EBOV and SUDV at equivalent levels and BDBV at only a slightly reduced level. Peptide microarrays revealed a preponderance of binding to amino acids 389 to 403, 397 to 415, and 477 to 493, representing three linear epitopes in the mucin-like domain known to induce a protective antibody response. Competition binding assays with monoclonal antibodies isolated from human ebolavirus infection survivors demonstrated that the immune sera block the binding of antibodies specific for the GP glycan cap, the GP1-GP2 interface, the mucin-like domain, and the membrane-proximal external region. Thus, administration of a cocktail of three ebolavirus vaccines induces a desirable broad antibody response, without skewing of the response toward preferential recognition of a single virus.IMPORTANCE The symptoms of the disease caused by the ebolaviruses Ebola, Bundibugyo, and Sudan are similar, and their areas of endemicity overlap. However, because of the limited antigenic relatedness of the ebolavirus glycoprotein (GP) used in all candidate vaccines against these viruses, they protect only against homologous and not against heterologous ebolaviruses. Therefore, a broadly specific pan-ebolavirus vaccine is required, and this might be achieved by administration of a cocktail of vaccines. The effects of cocktail administration of ebolavirus vaccines on the antibody repertoire remain unknown. Here, an in-depth analysis of the antibody responses to administration of a cocktail of human parainfluenza virus type 3-vectored vaccines against individual ebolaviruses was performed, which included analysis of binding to GP, neutralization of individual ebolaviruses, epitope specificity, Fc-mediated functions, and protection against the three ebolaviruses. The results demonstrated potent and balanced responses against individual ebolaviruses and no significant reduction of the responses compared to that induced by individual vaccines.
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21
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Warfield KL, Howell KA, Vu H, Geisbert J, Wong G, Shulenin S, Sproule S, Holtsberg FW, Leung DW, Amarasinghe GK, Swenson DL, Bavari S, Kobinger GP, Geisbert TW, Aman MJ. Role of Antibodies in Protection Against Ebola Virus in Nonhuman Primates Immunized With Three Vaccine Platforms. J Infect Dis 2018; 218:S553-S564. [PMID: 29939318 PMCID: PMC6249597 DOI: 10.1093/infdis/jiy316] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Background Several vaccine platforms have been successfully evaluated for prevention of Ebola virus (EBOV) disease (EVD) in nonhuman primates and humans. Despite remarkable efficacy by multiple vaccines, the immunological correlates of protection against EVD are incompletely understood. Methods We systematically evaluated the antibody response to various EBOV proteins in 79 nonhuman primates vaccinated with various EBOV vaccine platforms. We evaluated the serum immunoglobulin (Ig)G titers against EBOV glycoprotein (GP), the ability of the vaccine-induced antibodies to bind GP at acidic pH or to displace ZMapp, and virus neutralization titers. The correlation of these outcomes with survival from EVD was evaluated by appropriate statistical methods. Results Irrespective of the vaccine platform, protection from EVD strongly correlated with anti-GP IgG titers. The GP-directed antibody levels required for protection in animals vaccinated with virus-like particles (VLPs) lacking nucleoprotein (NP) was significantly higher than animals immunized with NP-containing VLPs or adenovirus-expressed GP, platforms that induce strong T-cell responses. Furthermore, protective immune responses correlated with anti-GP antibody binding strength at acidic pH, neutralization of GP-expressing pseudovirions, and the ability to displace ZMapp components from GP. Conclusions These findings suggest key quantitative and qualitative attributes of antibody response to EVD vaccines as potential correlates of protection.
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Affiliation(s)
| | | | - Hong Vu
- Integrated BioTherapeutics Inc., Rockville, Maryland
| | | | - Gary Wong
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba
| | | | | | | | - Daisy W Leung
- Departments of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri
| | - Gaya K Amarasinghe
- Departments of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri
| | - Dana L Swenson
- US Army Medical Research Institute of Infectious Diseases, Frederick, Maryland
| | - Sina Bavari
- US Army Medical Research Institute of Infectious Diseases, Frederick, Maryland
| | - Gary P Kobinger
- Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba
| | | | - M Javad Aman
- Integrated BioTherapeutics Inc., Rockville, Maryland
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Dhama K, Karthik K, Khandia R, Chakraborty S, Munjal A, Latheef SK, Kumar D, Ramakrishnan MA, Malik YS, Singh R, Malik SVS, Singh RK, Chaicumpa W. Advances in Designing and Developing Vaccines, Drugs, and Therapies to Counter Ebola Virus. Front Immunol 2018; 9:1803. [PMID: 30147687 PMCID: PMC6095993 DOI: 10.3389/fimmu.2018.01803] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Accepted: 07/23/2018] [Indexed: 01/10/2023] Open
Abstract
Ebola virus (EBOV), a member of the family Filoviridae, is responsible for causing Ebola virus disease (EVD) (formerly named Ebola hemorrhagic fever). This is a severe, often fatal illness with mortality rates varying from 50 to 90% in humans. Although the virus and associated disease has been recognized since 1976, it was only when the recent outbreak of EBOV in 2014-2016 highlighted the danger and global impact of this virus, necessitating the need for coming up with the effective vaccines and drugs to counter its pandemic threat. Albeit no commercial vaccine is available so far against EBOV, a few vaccine candidates are under evaluation and clinical trials to assess their prophylactic efficacy. These include recombinant viral vector (recombinant vesicular stomatitis virus vector, chimpanzee adenovirus type 3-vector, and modified vaccinia Ankara virus), Ebola virus-like particles, virus-like replicon particles, DNA, and plant-based vaccines. Due to improvement in the field of genomics and proteomics, epitope-targeted vaccines have gained top priority. Correspondingly, several therapies have also been developed, including immunoglobulins against specific viral structures small cell-penetrating antibody fragments that target intracellular EBOV proteins. Small interfering RNAs and oligomer-mediated inhibition have also been verified for EVD treatment. Other treatment options include viral entry inhibitors, transfusion of convalescent blood/serum, neutralizing antibodies, and gene expression inhibitors. Repurposed drugs, which have proven safety profiles, can be adapted after high-throughput screening for efficacy and potency for EVD treatment. Herbal and other natural products are also being explored for EVD treatment. Further studies to better understand the pathogenesis and antigenic structures of the virus can help in developing an effective vaccine and identifying appropriate antiviral targets. This review presents the recent advances in designing and developing vaccines, drugs, and therapies to counter the EBOV threat.
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Affiliation(s)
- Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | - Kumaragurubaran Karthik
- Central University Laboratory, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - Rekha Khandia
- Department of Biochemistry and Genetics, Barkatullah University, Bhopal, India
| | - Sandip Chakraborty
- Department of Veterinary Microbiology, College of Veterinary Sciences and Animal Husbandry, Agartala, India
| | - Ashok Munjal
- Department of Biochemistry and Genetics, Barkatullah University, Bhopal, India
| | - Shyma K. Latheef
- Immunology Section, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | - Deepak Kumar
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | | | - Yashpal Singh Malik
- Division of Biological Standardization, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | - Rajendra Singh
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | - Satya Veer Singh Malik
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | - Raj Kumar Singh
- ICAR-Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - Wanpen Chaicumpa
- Center of Research Excellence on Therapeutic Proteins and Antibody Engineering, Department of Parasitology, Faculty of Medicine SIriraj Hospital, Mahidol University, Bangkok, Thailand
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Distinct Immunogenicity and Efficacy of Poxvirus-Based Vaccine Candidates against Ebola Virus Expressing GP and VP40 Proteins. J Virol 2018. [PMID: 29514907 DOI: 10.1128/jvi.00363-18] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Zaire and Sudan ebolavirus species cause a severe disease in humans and nonhuman primates (NHPs) characterized by a high mortality rate. There are no licensed therapies or vaccines against Ebola virus disease (EVD), and the recent 2013 to 2016 outbreak in West Africa highlighted the need for EVD-specific medical countermeasures. Here, we generated and characterized head-to-head the immunogenicity and efficacy of five vaccine candidates against Zaire ebolavirus (EBOV) and Sudan ebolavirus (SUDV) based on the highly attenuated poxvirus vector modified vaccinia virus Ankara (MVA) expressing either the virus glycoprotein (GP) or GP together with the virus protein 40 (VP40) forming virus-like particles (VLPs). In a human monocytic cell line, the different MVA vectors (termed MVA-EBOVs and MVA-SUDVs) triggered robust innate immune responses, with production of beta interferon (IFN-β), proinflammatory cytokines, and chemokines. Additionally, several innate immune cells, such as dendritic cells, neutrophils, and natural killer cells, were differentially recruited in the peritoneal cavity of mice inoculated with MVA-EBOVs. After immunization of mice with a homologous prime/boost protocol (MVA/MVA), total IgG antibodies against GP or VP40 from Zaire and Sudan ebolavirus were differentially induced by these vectors, which were mainly of the IgG1 and IgG3 isotypes. Remarkably, an MVA-EBOV construct coexpressing GP and VP40 protected chimeric mice challenged with EBOV to a greater extent than a vector expressing GP alone. These results support the consideration of MVA-EBOVs and MVA-SUDVs expressing GP and VP40 and producing VLPs as best-in-class potential vaccine candidates against EBOV and SUDV.IMPORTANCE EBOV and SUDV cause a severe hemorrhagic fever affecting humans and NHPs. Since their discovery in 1976, they have caused several sporadic epidemics, with the recent outbreak in West Africa from 2013 to 2016 being the largest and most severe, with more than 11,000 deaths being reported. Although some vaccines are in advanced clinical phases, less expensive, safer, and more effective licensed vaccines are desirable. We generated and characterized head-to-head the immunogenicity and efficacy of five novel vaccines against EBOV and SUDV based on the poxvirus MVA expressing GP or GP and VP40. The expression of GP and VP40 leads to the formation of VLPs. These MVA-EBOV and MVA-SUDV recombinants triggered robust innate and humoral immune responses in mice. Furthermore, MVA-EBOV recombinants expressing GP and VP40 induced high protection against EBOV in a mouse challenge model. Thus, MVA expressing GP and VP40 and producing VLPs is a promising vaccine candidate against EBOV and SUDV.
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Martinez-Gil L, Goff PH, Tan GS. The Role of Self-Assembling Lipid Molecules in Vaccination. ADVANCES IN BIOMEMBRANES AND LIPID SELF-ASSEMBLY 2018. [PMCID: PMC7147077 DOI: 10.1016/bs.abl.2017.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The advent of vaccines represents one of the most significant advances in medical history. The protection provided by vaccines has greatly contributed in reducing the number of cases of infections and most notably to the eradication of small pox. A large number of new technologies and approaches in vaccine development are currently being investigated with the goal of providing the basis for the next generation of prophylactics against an ever-expanding list of emerging and reemerging pathogens. In this chapter, we will focus on the role of lipids and lipid self-assembling vesicles in new and promising vaccination approaches. We will start by describing how lipids can induce activation of the innate immune system and focus on some lipid-derived vaccine adjuvants. Next, we will review current lipid-based self-assembling particles used as vaccine platforms, specifically liposomes and virus-like particles, and how virus-like particles have facilitated research of highly pathogenic viruses such as Ebola.
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Recent advances in vaccine development against Ebola threat as bioweapon. Virusdisease 2017; 28:242-246. [PMID: 29291209 DOI: 10.1007/s13337-017-0398-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 08/29/2017] [Indexed: 12/19/2022] Open
Abstract
With the increasing rate of Ebola virus appearance, with multiple natural outbreaks of Ebola hemorrhagic fever, it is worthy of consideration as bioweapon by anti-national groups. Further, with the non-availability of the vaccines against Ebola virus, concerns about the public health emerge. In this regard, this review summarizes the structure, genetics and potential of Ebola virus to be used as a bioweapon. We highlight the recent advances in the treatment strategies and vaccine development against Ebola virus. The understanding of these aspects might lead to effective treatment practices which can be applied during the future outbreaks of Ebola.
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Abstract
The filoviruses, Ebola virus (EBOV), and Marburg virus (MARV), are among the most pathogenic viruses known to man and the causative agents of viral hemorrhagic fever outbreaks in Africa with case fatality rates of up to 90%. Nearly 30,000 infections were observed in the latest EBOV epidemic in West Africa; previous outbreaks were much smaller, typically only affecting less than a few hundred people. Compared to other diseases such as AIDS or Malaria with millions of cases annually, filovirus hemorrhagic fever (FHF) is one of the neglected infectious diseases. There are no licensed vaccines or therapeutics available to treat EBOV and MARV infections; therefore, these pathogens can only be handled in maximum containment laboratories and are classified as select agents. Under these limitations, a very few laboratories worldwide conducted basic research and countermeasure development for EBOV and MARV since their respective discoveries in 1967 (MARV) and 1976 (EBOV). In this review, we discuss several vaccine platforms against EBOV and MARV, which have been assessed for their protective efficacy in animal models of FHF. The focus is on the most promising approaches, which were accelerated in clinical development (phase I-III trials) during the EBOV epidemic in West Africa.
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Affiliation(s)
- Pierce Reynolds
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA
| | - Andrea Marzi
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA.
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Monreal-Escalante E, Ramos-Vega AA, Salazar-González JA, Bañuelos-Hernández B, Angulo C, Rosales-Mendoza S. Expression of the VP40 antigen from the Zaire ebolavirus in tobacco plants. PLANTA 2017; 246:123-132. [PMID: 28389867 DOI: 10.1007/s00425-017-2689-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Accepted: 03/31/2017] [Indexed: 06/07/2023]
Abstract
MAIN CONCLUSION The plant cell is able to produce the VP40 antigen from the Zaire ebolavirus , retaining the antigenicity and the ability to induce immune responses in BALB/c mice. The recent Ebola outbreak evidenced the need for having vaccines approved for human use. Herein we report the expression of the VP40 antigen from the Ebola virus as an initial effort in the development of a plant-made vaccine that could offer the advantages of being cheap and scalable, which is proposed to overcome the rapid need for having vaccines to deal with future outbreaks. Tobacco plants were transformed by stable DNA integration into the nuclear genome using the CaMV35S promoter and a signal peptide to access the endoplasmic reticulum, reaching accumulation levels up to 2.6 µg g-1 FW leaf tissues. The antigenicity of the plant-made VP40 antigen was evidenced by Western blot and an initial immunogenicity assessment in test animals that revealed the induction of immune responses in BALB/c mice following three weekly oral or subcutaneous immunizations at very low doses (125 and 25 ng, respectively) without accessory adjuvants. Therefore, this plant-based vaccination prototype is proposed as an attractive platform for the production of vaccines in the fight against Ebola virus disease outbreaks.
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Affiliation(s)
- Elizabeth Monreal-Escalante
- Laboratorio de Biofarmacéuticos Recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, 78210, San Luis Potosí, SLP, Mexico
| | - Abel A Ramos-Vega
- Grupo de Inmunología y Vacunología, Centro de Investigaciones Biológicas del Noroeste, S.C., Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, 23096, La Paz, BCS, Mexico
| | - Jorge A Salazar-González
- Laboratorio de Biofarmacéuticos Recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, 78210, San Luis Potosí, SLP, Mexico
| | - Bernardo Bañuelos-Hernández
- Laboratorio de Biofarmacéuticos Recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, 78210, San Luis Potosí, SLP, Mexico
| | - Carlos Angulo
- Grupo de Inmunología y Vacunología, Centro de Investigaciones Biológicas del Noroeste, S.C., Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, 23096, La Paz, BCS, Mexico
| | - Sergio Rosales-Mendoza
- Laboratorio de Biofarmacéuticos Recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, 78210, San Luis Potosí, SLP, Mexico.
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Recombinant Modified Vaccinia Virus Ankara Generating Ebola Virus-Like Particles. J Virol 2017; 91:JVI.00343-17. [PMID: 28331098 DOI: 10.1128/jvi.00343-17] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 03/12/2017] [Indexed: 12/29/2022] Open
Abstract
There are currently no approved therapeutics or vaccines to treat or protect against the severe hemorrhagic fever and death caused by Ebola virus (EBOV). Ebola virus-like particles (EBOV VLPs) consisting of the matrix protein VP40, the glycoprotein (GP), and the nucleoprotein (NP) are highly immunogenic and protective in nonhuman primates against Ebola virus disease (EVD). We have constructed a modified vaccinia virus Ankara-Bavarian Nordic (MVA-BN) recombinant coexpressing VP40 and GP of EBOV Mayinga and the NP of Taï Forest virus (TAFV) (MVA-BN-EBOV-VLP) to launch noninfectious EBOV VLPs as a second vaccine modality in the MVA-BN-EBOV-VLP-vaccinated organism. Human cells infected with either MVA-BN-EBOV-VLP or MVA-BN-EBOV-GP showed comparable GP expression levels and transport of complex N-glycosylated GP to the cell surface. Human cells infected with MVA-BN-EBOV-VLP produced large amounts of EBOV VLPs that were decorated with GP spikes but excluded the poxviral membrane protein B5, thus resembling authentic EBOV particles. The heterologous TAFV NP enhanced EBOV VP40-driven VLP formation with efficiency similar to that of the homologous EBOV NP in a transient-expression assay, and both NPs were incorporated into EBOV VLPs. EBOV GP-specific CD8 T cell responses were comparable between MVA-BN-EBOV-VLP- and MVA-BN-EBOV-GP-immunized mice. The levels of EBOV GP-specific neutralizing and binding antibodies, as well as GP-specific IgG1/IgG2a ratios induced by the two constructs, in mice were also similar, raising the question whether the quality rather than the quantity of the GP-specific antibody response might be altered by an EBOV VLP-generating MVA recombinant.IMPORTANCE The recent outbreak of Ebola virus (EBOV), claiming more than 11,000 lives, has underscored the need to advance the development of safe and effective filovirus vaccines. Virus-like particles (VLPs), as well as recombinant viral vectors, have proved to be promising vaccine candidates. Modified vaccinia virus Ankara-Bavarian Nordic (MVA-BN) is a safe and immunogenic vaccine vector with a large capacity to accommodate multiple foreign genes. In this study, we combined the advantages of VLPs and the MVA platform by generating a recombinant MVA-BN-EBOV-VLP that would produce noninfectious EBOV VLPs in the vaccinated individual. Our results show that human cells infected with MVA-BN-EBOV-VLP indeed formed and released EBOV VLPs, thus producing a highly authentic immunogen. MVA-BN-EBOV-VLP efficiently induced EBOV-specific humoral and cellular immune responses in vaccinated mice. These results are the basis for future advancements, e.g., by including antigens from various filoviral species to develop multivalent VLP-producing MVA-based filovirus vaccines.
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Sharma R, Jangid K, Anuradha. Ebola Vaccine: How Far are we? J Clin Diagn Res 2017; 11:DE01-DE04. [PMID: 28658761 PMCID: PMC5483663 DOI: 10.7860/jcdr/2017/22184.9863] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 02/05/2017] [Indexed: 11/24/2022]
Abstract
Ebola viruses have been identified as an emerging threat as it causes severe haemorrhagic fever in human with mortality rates ranging from 50 to 90%. In addition to being a global health concern, the virus also is considered a potential biological threat agent. As for now, no licensed vaccine is available for pre or post exposure treatment. Recent epidemic of this disease in South Africa has led to concern towards development of an effective vaccine on a priority basis. This review is an attempt to look upon current progress in the development of Ebola virus vaccines and highlights strategies that have the greatest potential for commercial development.
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Affiliation(s)
- Rajani Sharma
- Senior Resident, Department of Microbiology, PGIMER and Dr. Ram Manohar Lohia Hospital, New Delhi, India
| | - Ketki Jangid
- Senior Resident, Department of Microbiology, PGIMER and Dr. Ram Manohar Lohia Hospital, New Delhi, India
| | - Anuradha
- Assistant Professor, Department of Microbiology, PGIMER and Dr. Ram Manohar Lohia Hospital, New Delhi, India
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30
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Froude JW, Pelat T, Miethe S, Zak SE, Wec AZ, Chandran K, Brannan JM, Bakken RR, Hust M, Thullier P, Dye JM. Generation and characterization of protective antibodies to Marburg virus. MAbs 2017; 9:696-703. [PMID: 28287337 DOI: 10.1080/19420862.2017.1299848] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Marburg virus (MARV) and Ebola virus (EBOV) have been a source of epidemics and outbreaks for several decades. We present here the generation and characterization of the first protective antibodies specific for wild-type MARV. Non-human primates (NHP), cynomolgus macaques, were immunized with viral-replicon particles expressing the glycoproteins (GP) of MARV (Ci67 isolate). An antibody fragment (single-chain variable fragment, scFv) phage display library was built after four immunogen injections, and screened against the GP1-649 of MARV. Sequencing of 192 selected clones identified 18 clones with distinct VH and VL sequences. Four of these recombinant antibodies (R4A1, R4B11, R4G2, and R3F6) were produced in the scFv-Fc format for in vivo studies. Mice that were challenged with wild-type Marburg virus (Ci67 isolate) receiving 100 µg of scFv-Fc on days -1, 1 and 3 demonstrated protective efficacies ranging from 75-100%. The amino-acid sequences of the scFv-Fcs are similar to those of their human germline counterparts, sharing an identity ranging between 68 and 100% to human germline immunoglobulin. These results demonstrate for the first time that recombinant antibodies offer protection against wild-type MARV, and suggest they may be promising candidates for further therapeutic development especially due to their human homology.
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Affiliation(s)
- Jeffrey W Froude
- a US Army Medical Research Institute for Infectious Disease (USAMRIID) , Fort Detrick , MD , USA
| | - Thibaut Pelat
- b Unite de Biotechnologie des Anticorps, Institut de Recherche Biomedicale des Armees [IRBA-CRSSA] , La Tronche , France.,c BIOTEM, Apprieu , France
| | - Sebastian Miethe
- d Technische Universität Braunschweig, Institut für Biochemie, Biotechnologie und Bioinformatik Braunschweig , Germany.,e YUMAB GmbH, Rebenring , Braunschweig , Germany
| | - Samantha E Zak
- a US Army Medical Research Institute for Infectious Disease (USAMRIID) , Fort Detrick , MD , USA
| | - Anna Z Wec
- f Department of Microbiology and Immunology , Albert Einstein College of Medicine , Bronx , NY , USA
| | - Kartik Chandran
- f Department of Microbiology and Immunology , Albert Einstein College of Medicine , Bronx , NY , USA
| | - Jennifer Mary Brannan
- a US Army Medical Research Institute for Infectious Disease (USAMRIID) , Fort Detrick , MD , USA
| | - Russell R Bakken
- a US Army Medical Research Institute for Infectious Disease (USAMRIID) , Fort Detrick , MD , USA
| | - Michael Hust
- d Technische Universität Braunschweig, Institut für Biochemie, Biotechnologie und Bioinformatik Braunschweig , Germany
| | - Philippe Thullier
- b Unite de Biotechnologie des Anticorps, Institut de Recherche Biomedicale des Armees [IRBA-CRSSA] , La Tronche , France
| | - John M Dye
- a US Army Medical Research Institute for Infectious Disease (USAMRIID) , Fort Detrick , MD , USA
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Abstract
Although viruses are simple biological systems, they are capable of evolving highly efficient techniques for infecting cells, expressing their genomes, and generating new copies of themselves. It is possible to genetically manipulate most of the different classes of known viruses in order to produce recombinant viruses that express foreign proteins. Recombinant viruses have been used in gene therapy to deliver selected genes into higher organisms, in vaccinology and immunotherapy, and as important research tools to study the structure and function of these proteins. Virus-like particles (VLPs) are multiprotein structures that mimic the organization and conformation of authentic native viruses but lack the viral genome. They have been applied not only as prophylactic and therapeutic vaccines but also as vehicles in drug and gene delivery and, more recently, as tools in nanobiotechnology. In this chapter, basic and advanced features of viruses and VLPs are presented and their major applications are discussed. The different production platforms based on animal cell technology are explained, and their main challenges and future perspectives are explored. The implications of large-scale production of viruses and VLPs are discussed in the context of process control, monitoring, and optimization. The main upstream and downstream technical challenges are identified and discussed accordingly.
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Zai J, Yi Y, Xia H, Zhang B, Yuan Z. A new strategy for full-length Ebola virus glycoprotein expression in E.coli. Virol Sin 2016; 31:500-508. [PMID: 28000060 DOI: 10.1007/s12250-016-3845-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Accepted: 11/22/2016] [Indexed: 11/26/2022] Open
Abstract
Ebola virus (EBOV) causes severe hemorrhagic fever in humans and non-human primates with high rates of fatality. Glycoprotein (GP) is the only envelope protein of EBOV, which may play a critical role in virus attachment and entry as well as stimulating host protective immune responses. However, the lack of expression of full-length GP in Escherichia coli hinders the further study of its function in viral pathogenesis. In this study, the vp40 gene was fused to the full-length gp gene and cloned into a prokaryotic expression vector. We showed that the VP40-GP and GP-VP40 fusion proteins could be expressed in E.coli at 16 °C. In addition, it was shown that the position of vp40 in the fusion proteins affected the yields of the fusion proteins, with a higher level of production of the fusion protein when vp40 was upstream of gp compared to when it was downstream. The results provide a strategy for the expression of a large quantity of EBOV full-length GP, which is of importance for further analyzing the relationship between the structure and function of GP and developing an antibody for the treatment of EBOV infection.
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Affiliation(s)
- Junjie Zai
- Key Laboratory of Agricultural and Environmental Microbiology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yinhua Yi
- Key Laboratory of Agricultural and Environmental Microbiology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Han Xia
- Key Laboratory of Agricultural and Environmental Microbiology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Bo Zhang
- Key Laboratory of Special Pathogens and Biosafety, Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Zhiming Yuan
- Key Laboratory of Agricultural and Environmental Microbiology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China.
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Abstract
Long-term control of viral outbreaks requires the use of vaccines to impart acquired resistance and ensuing protection. In the wake of an epidemic, established immunity against a particular disease can limit spread and significantly decrease mortality. Creation of a safe and efficacious vaccine against Ebola virus (EBOV) has proven elusive so far, but various inventive strategies are now being employed to counteract the threat of outbreaks caused by EBOV and related filoviruses. Here, we present a current overview of progress in the field of Ebola virus vaccine development.
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Affiliation(s)
- Rohan Keshwara
- Department of Microbiology and Immunology, Sidney Kimmel Medical College,Thomas Jefferson University, Philadelphia, Pennsylvania 19107;
| | - Reed F Johnson
- Emerging Viral Pathogens Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892
| | - Matthias J Schnell
- Department of Microbiology and Immunology, Sidney Kimmel Medical College,Thomas Jefferson University, Philadelphia, Pennsylvania 19107;
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34
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[Overview of the Ebola vaccines in pre-clinical and clinical development]. BULLETIN DE LA SOCIETE DE PATHOLOGIE EXOTIQUE (1990) 2016; 109:256-261. [PMID: 27646961 DOI: 10.1007/s13149-016-0521-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 08/26/2016] [Indexed: 10/21/2022]
Abstract
The Ebola epidemic that occurred in West Africa between 2013-2016 significantly accelerated the research and development of Ebola vaccines. Few dozens of clinical trials have been recently conducted leading to opportunities to test several new vaccine candidates. Other vaccines are still in early development phases (table 1). This paper provides an overview of the new developments in that area.
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Development of a liquid chromatography high resolution mass spectrometry method for the quantitation of viral envelope glycoprotein in Ebola virus-like particle vaccine preparations. Clin Proteomics 2016; 13:18. [PMID: 27597813 PMCID: PMC5011338 DOI: 10.1186/s12014-016-9119-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 07/13/2016] [Indexed: 01/30/2023] Open
Abstract
Background Ebola virus like particles (EBOV VLPs, eVLPs), are produced by expressing the viral transmembrane glycoprotein (GP) and structural matrix protein VP40 in mammalian cells. When expressed, these proteins self-assemble and bud from ‘host’ cells displaying morphology similar to infectious virions. Several studies have shown that rodents and non-human primates vaccinated with eVLPs are protected from lethal EBOV challenge. The mucin-like domain of envelope glycoprotein GP1 serves as the major target for a productive humoral immune response. Therefore GP1 concentration is a critical quality attribute of EBOV vaccines and accurate measurement of the amount of GP1 present in eVLP lots is crucial to understanding variability in vaccine efficacy. Methods After production, eVLPs are characterized by determining total protein concentration and by western blotting, which only provides semi-quantitative information for GP1. Therefore, a liquid chromatography high resolution mass spectrometry (LC-HRMS) approach for accurately measuring GP1 concentration in eVLPs was developed. The method employs an isotope dilution strategy using four target peptides from two regions of the GP1 protein. Purified recombinant GP1 was generated to serve as an assay standard. GP1 quantitation in 5 eVLP lots was performed on an LTQ-Orbitrap Elite and the final quantitation was derived by comparing the relative response of 200 fmol AQUA peptide standards to the analyte response at 4 ppm. Results Conditions were optimized to ensure complete tryptic digestion of eVLP, however, persistent missed cleavages were observed in target peptides. Additionally, N-terminal truncated forms of the GP1 protein were observed in all eVLP lots, making peptide selection crucial. The LC-HRMS strategy resulted in quantitation of GP1 with a lower limit of quantitation of 1 fmol and an average percent coefficient of variation (CV) of 7.6 %. Unlike western blot values, the LC-HRMS quantitation of GP1 in 5 eVLP vaccine lots exhibited a strong linear relationship (positive correlation) with survival (after EBOV challenge) in mice. Conclusions This method provides a means to rapidly determine eVLP batch quality based upon quantitation of antigenic GP1. By monitoring variability in GP1 content, the eVLP production process can be optimized, and the total amount of GP1 needed to confer protection accurately determined. Electronic supplementary material The online version of this article (doi:10.1186/s12014-016-9119-8) contains supplementary material, which is available to authorized users.
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Martins KA, Jahrling PB, Bavari S, Kuhn JH. Ebola virus disease candidate vaccines under evaluation in clinical trials. Expert Rev Vaccines 2016; 15:1101-12. [PMID: 27160784 PMCID: PMC5026048 DOI: 10.1080/14760584.2016.1187566] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Filoviruses are the etiological agents of two human illnesses: Ebola virus disease and Marburg virus disease. Until 2013, medical countermeasure development against these afflictions was limited to only a few research institutes worldwide as both infections were considered exotic due to very low case numbers. Together with the high case-fatality rate of both diseases, evaluation of any candidate countermeasure in properly controlled clinical trials seemed impossible. However, in 2013, Ebola virus was identified as the etiological agent of a large disease outbreak in Western Africa including almost 30,000 infections and more than 11,000 deaths, including case exportations to Europe and North America. These large case numbers resulted in medical countermeasure development against Ebola virus disease becoming a global public-health priority. This review summarizes the status quo of candidate vaccines against Ebola virus disease, with a focus on those that are currently under evaluation in clinical trials.
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Affiliation(s)
- Karen A. Martins
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Peter B. Jahrling
- Integrated Research Facility at Fort Detrick, Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick, Maryland, USA
| | - Sina Bavari
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Jens H. Kuhn
- Integrated Research Facility at Fort Detrick, Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick, Maryland, USA
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Dye JM, Warfield KL, Wells JB, Unfer RC, Shulenin S, Vu H, Nichols DK, Aman MJ, Bavari S. Virus-Like Particle Vaccination Protects Nonhuman Primates from Lethal Aerosol Exposure with Marburgvirus (VLP Vaccination Protects Macaques against Aerosol Challenges). Viruses 2016; 8:94. [PMID: 27070636 PMCID: PMC4848589 DOI: 10.3390/v8040094] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 03/23/2016] [Accepted: 03/24/2016] [Indexed: 01/21/2023] Open
Abstract
Marburg virus (MARV) was the first filovirus to be identified following an outbreak of viral hemorrhagic fever disease in Marburg, Germany in 1967. Due to several factors inherent to filoviruses, they are considered a potential bioweapon that could be disseminated via an aerosol route. Previous studies demonstrated that MARV virus-like particles (VLPs) containing the glycoprotein (GP), matrix protein VP40 and nucleoprotein (NP) generated using a baculovirus/insect cell expression system could protect macaques from subcutaneous (SQ) challenge with multiple species of marburgviruses. In the current study, the protective efficacy of the MARV VLPs in conjunction with two different adjuvants: QS-21, a saponin derivative, and poly I:C against homologous aerosol challenge was assessed in cynomolgus macaques. Antibody responses against the GP antigen were equivalent in all groups receiving MARV VLPs irrespective of the adjuvant; adjuvant only-vaccinated macaques did not demonstrate appreciable antibody responses. All macaques were subsequently challenged with lethal doses of MARV via aerosol or SQ as a positive control. All MARV VLP-vaccinated macaques survived either aerosol or SQ challenge while animals administered adjuvant only exhibited clinical signs and lesions consistent with MARV disease and were euthanized after meeting the predetermined criteria. Therefore, MARV VLPs induce IgG antibodies recognizing MARV GP and VP40 and protect cynomolgus macaques from an otherwise lethal aerosol exposure with MARV.
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Affiliation(s)
- John M Dye
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA.
| | | | - Jay B Wells
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA.
| | - Robert C Unfer
- Integrated Biotherapeutics, Inc., Gaithersburg, MD 20878, USA.
| | - Sergey Shulenin
- Integrated Biotherapeutics, Inc., Gaithersburg, MD 20878, USA.
| | - Hong Vu
- Integrated Biotherapeutics, Inc., Gaithersburg, MD 20878, USA.
| | - Donald K Nichols
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA.
| | - M Javad Aman
- Integrated Biotherapeutics, Inc., Gaithersburg, MD 20878, USA.
| | - Sina Bavari
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA.
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Shirbaghaee Z, Bolhassani A. Different applications of virus-like particles in biology and medicine: Vaccination and delivery systems. Biopolymers 2016; 105:113-32. [PMID: 26509554 PMCID: PMC7161881 DOI: 10.1002/bip.22759] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 10/25/2015] [Accepted: 10/25/2015] [Indexed: 12/17/2022]
Abstract
Virus-like particles (VLPs) mimic the whole construct of virus particles devoid of viral genome as used in subunit vaccine design. VLPs can elicit efficient protective immunity as direct immunogens compared to soluble antigens co-administered with adjuvants in several booster injections. Up to now, several prokaryotic and eukaryotic systems such as insect, yeast, plant, and E. coli were used to express recombinant proteins, especially for VLP production. Recent studies are also generating VLPs in plants using different transient expression vectors for edible vaccines. VLPs and viral particles have been applied for different functions such as gene therapy, vaccination, nanotechnology, and diagnostics. Herein, we describe VLP production in different systems as well as its applications in biology and medicine.
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Affiliation(s)
- Zeinab Shirbaghaee
- Department of Hepatitis and AIDSPasteur Institute of IranTehranIran
- Department of Immunology, School of Public HealthTehran University of Medical SciencesTehranIran
| | - Azam Bolhassani
- Department of Hepatitis and AIDSPasteur Institute of IranTehranIran
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Martins KAO, Cooper CL, Stronsky SM, Norris SLW, Kwilas SA, Steffens JT, Benko JG, van Tongeren SA, Bavari S. Adjuvant-enhanced CD4 T Cell Responses are Critical to Durable Vaccine Immunity. EBioMedicine 2015; 3:67-78. [PMID: 26870818 PMCID: PMC4739439 DOI: 10.1016/j.ebiom.2015.11.041] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 11/23/2015] [Accepted: 11/24/2015] [Indexed: 01/08/2023] Open
Abstract
Protein-based vaccines offer a safer alternative to live-attenuated or inactivated vaccines but have limited immunogenicity. The identification of adjuvants that augment immunogenicity, specifically in a manner that is durable and antigen-specific, is therefore critical for advanced development. In this study, we use the filovirus virus-like particle (VLP) as a model protein-based vaccine in order to evaluate the impact of four candidate vaccine adjuvants on enhancing long term protection from Ebola virus challenge. Adjuvants tested include poly-ICLC (Hiltonol), MPLA, CpG 2395, and alhydrogel. We compared and contrasted antibody responses, neutralizing antibody responses, effector T cell responses, and T follicular helper (Tfh) cell frequencies with each adjuvant's impact on durable protection. We demonstrate that in this system, the most effective adjuvant elicits a Th1-skewed antibody response and strong CD4 T cell responses, including an increase in Tfh frequency. Using immune-deficient animals and adoptive transfer of serum and cells from vaccinated animals into naïve animals, we further demonstrate that serum and CD4 T cells play a critical role in conferring protection within effective vaccination regimens. These studies inform on the requirements of long term immune protection, which can potentially be used to guide screening of clinical-grade adjuvants for vaccine clinical development. Adjuvants can prolong the protection afforded by protein-based vaccines and impact adaptive immune responses Enhanced CD4 T cell responses, helper and effector, correlate with duration of protection Durable protection from ma-EBOV is associated with Tfh frequency, Th1 antibody titers, and effector CD4 T cells
Protein-based vaccines are extremely safe, but they sometimes require the addition of adjuvants to enhance immunogenicity. In this study, we compared the impact of multiple adjuvants on immunogenicity, focusing on the duration of vaccine-mediated protection in mice. We then looked at how each adjuvant impacted the immune response in order to identify correlates of that long lasting immunity. The most effective adjuvant/vaccine combinations elicited multifunctional CD4 T cell responses and a Th1-skewed antibody response. By transferring antigen-experienced CD4 T cells and serum into naïve animals, we demonstrated that both CD4 T cells and serum were critical for durable vaccine-mediated protection.
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Key Words
- Adjuvant
- BME, beta mercaptoethanol
- CD, cluster of differentiation
- DSCF, Dwass, Steel, Critchlow-Fligner
- Durable protection
- ELISA, Enzyme linked immunosorbent assay
- ELISPOT, enzyme-linked immunospot assay
- Ebola virus
- FACS, fluorescence activated cell sorting
- FBS, fetal bovine serum
- GP, glycoprotein
- IACUC, Institutional Animal Care and Use Committee
- IM, intramuscular
- IP, intraperitoneal
- IQR, interquartile range
- Immune correlates
- LN, lymph node
- MPLA, monophosphoryl lipid A
- NAb, neutralizing antibody
- Ns, not significant
- PBS, phosphate buffered saline
- PRR, pattern recognition receptor
- Pfu, plaque forming unit
- PsVNA, pseudovirion neutralization assay
- TLR, Toll-like receptor
- USAMRIID, United States Army Medical Research Institute of Infectious Diseases
- VLP, virus-like particle
- Vaccine
- ma-EBOV, mouse-adapted Ebola virus
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Affiliation(s)
- Karen A O Martins
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA
| | - Christopher L Cooper
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA
| | - Sabrina M Stronsky
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA
| | - Sarah L W Norris
- Research Support Division, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA
| | - Steven A Kwilas
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA
| | - Jesse T Steffens
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA
| | - Jacqueline G Benko
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA
| | - Sean A van Tongeren
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA
| | - Sina Bavari
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD, USA.
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The application of virus-like particles as vaccines and biological vehicles. Appl Microbiol Biotechnol 2015; 99:10415-32. [PMID: 26454868 PMCID: PMC7080154 DOI: 10.1007/s00253-015-7000-8] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 09/01/2015] [Accepted: 09/04/2015] [Indexed: 01/04/2023]
Abstract
Virus-like particles (VLPs) can be spontaneously self-assembled by viral structural proteins under appropriate conditions in vitro while excluding the genetic material and potential replication probability. In addition, VLPs possess several features including can be rapidly produced in large quantities through existing expression systems, highly resembling native viruses in terms of conformation and appearance, and displaying repeated cluster of epitopes. Their capsids can be modified via genetic insertion or chemical conjugation which facilitating the multivalent display of a homologous or heterogeneous epitope antigen. Therefore, VLPs are considered as a safe and effective candidate of prophylactic and therapeutic vaccines. VLPs, with a diameter of approximately 20 to 150 nm, also have the characteristics of nanometer materials, such as large surface area, surface-accessible amino acids with reactive moieties (e.g., lysine and glutamic acid residues), inerratic spatial structure, and good biocompatibility. Therefore, assembled VLPs have great potential as a delivery system for specifically carrying a variety of materials. This review summarized recent researches on VLP development as vaccines and biological vehicles, which demonstrated the advantages and potential of VLPs in disease control and prevention and diagnosis. Then, the prospect of VLP biology application in the future is discussed as well.
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Jain NK, Sahni N, Kumru OS, Joshi SB, Volkin DB, Russell Middaugh C. Formulation and stabilization of recombinant protein based virus-like particle vaccines. Adv Drug Deliv Rev 2015; 93:42-55. [PMID: 25451136 DOI: 10.1016/j.addr.2014.10.023] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 10/15/2014] [Accepted: 10/18/2014] [Indexed: 02/06/2023]
Abstract
Vaccine formulation development has traditionally focused on improving antigen storage stability and compatibility with conventional adjuvants. More recently, it has also provided an opportunity to modify the interaction and presentation of an antigen/adjuvant to the immune system to better stimulate the desired immune responses for maximal efficacy. In the last decade, there has been a paradigm shift in vaccine antigen and formulation design involving an improved physical understanding of antigens and a better understanding of the immune system. In addition, the discovery of novel adjuvants and delivery systems promises to further improve the design of new, more effective vaccines. Here we describe some of the fundamental aspects of formulation design applicable to virus-like-particle based vaccine antigens (VLPs). Case studies are presented for commercially approved VLP vaccines as well as some investigational VLP vaccine candidates. An emphasis is placed on the biophysical analysis of vaccines to facilitate formulation and stabilization of these particulate antigens.
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Martins K, Carra JH, Cooper CL, Kwilas SA, Robinson CG, Shurtleff AC, Schokman RD, Kuehl KA, Wells JB, Steffens JT, van Tongeren SA, Hooper JW, Bavari S. Cross-protection conferred by filovirus virus-like particles containing trimeric hybrid glycoprotein. Viral Immunol 2015; 28:62-70. [PMID: 25514232 DOI: 10.1089/vim.2014.0071] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Filoviruses are causative agents of hemorrhagic fever, and to date no effective vaccine or therapeutic has been approved to combat infection. Filovirus glycoprotein (GP) is the critical immunogenic component of filovirus vaccines, eliciting high levels of antibody after successful vaccination. Previous work has shown that protection against both Ebola virus (EBOV) and Marburg virus (MARV) can be achieved by vaccinating with a mixture of virus-like particles (VLPs) expressing either EBOV GP or MARV GP. In this study, the potential for eliciting effective immune responses against EBOV, Sudan virus, and MARV with a single GP construct was tested. Trimeric hybrid GPs were produced that expressed the sequence of Marburg GP2 in conjunction with a hybrid GP1 composed EBOV and Sudan virus GP sequences. VLPs expressing these constructs, along with EBOV VP40, provided comparable protection against MARV challenge, resulting in 75 or 100% protection. Protection from EBOV challenge differed depending upon the hybrid used, however, with one conferring 75% protection and one conferring no protection. By comparing the overall antibody titers and the neutralizing antibody titers specific for each virus, it is shown that higher antibody responses were elicited by the C terminal region of GP1 than by the N terminal region, and this correlated with protection. These data collectively suggest that GP2 and the C terminal region of GP1 are highly immunogenic, and they advance progress toward the development of a pan-filovirus vaccine.
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Affiliation(s)
- Karen Martins
- 1 Department of Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases (USAMRIID) , Frederick, Maryland
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Carra JH, Martins KAO, Schokman RD, Robinson CG, Steffens JT, Bavari S. A thermostable, chromatographically purified Ebola nano-VLP vaccine. J Transl Med 2015; 13:228. [PMID: 26174690 PMCID: PMC4502941 DOI: 10.1186/s12967-015-0593-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 07/02/2015] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Filovirus virus-like particles (VLP) are strong immunogens with the potential for development into a safe, non-infectious vaccine. However, the large size and filamentous structure of this virus has heretofore made production of such a vaccine difficult. Herein, we present new assays and a purification procedure to yield a better characterized and more stable product. METHODS Sonication of VLP was used to produce smaller "nano-VLP", which were purified by membrane chromatography. The sizes and lengths of VLP particles were analyzed using electron microscopy and an assay based on transient occlusion of a nanopore. Using conformationally-sensitive antibodies, we developed an in vitro assay for measuring GP conformational integrity in the context of VLP, and used it to profile thermal stability. RESULTS We developed a new procedure for rapid isolation of Ebola VLP using membrane chromatography that yields a filterable and immunogenic product. Disruption of VLP filaments by sonication followed by filtration produced smaller particles of more uniform size, having a mean diameter close to 230 nm. These reduced-size VLP retained GP conformation and were protective against mouse-adapted Ebola challenge in mice. The "nano-VLP" consists of GP-coated particles in a mixture of morphologies including circular, branched, "6"-shaped, and filamentous ones up to ~1,500 nm in length. Lyophilization conferred a high level of thermostability on the nano-VLP. Unlike Ebola VLP in solution, which underwent denaturation of GP upon moderate heating, the lyophilized nano-VLP can withstand at least 1 h at 75°C, while retaining conformational integrity of GP and the ability to confer protective immunity in a mouse model. CONCLUSIONS We showed that Ebola virus-like particles can be reduced in size to a more amenable range for manipulation, and that these smaller particles retained their temperature stability, the structure of the GP antigen, and the ability to stimulate a protective immune response in mice. We developed a new purification scheme for "nano-VLP" that is more easily scaled up and filterable. The product could also be made thermostable by lyophilization, which is highly significant for vaccines used in tropical countries without a reliable "cold-chain" of refrigeration.
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Affiliation(s)
- John H Carra
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, 21702-9211, USA.
| | - Karen A O Martins
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, 21702-9211, USA.
| | - Rowena D Schokman
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, 21702-9211, USA.
| | - Camenzind G Robinson
- Pathology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, 21702-9211, USA. .,Janelia Farm Research Campus, Howard Hughes Medical Institute, Ashburn, VA, 20147, USA.
| | - Jesse T Steffens
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, 21702-9211, USA.
| | - Sina Bavari
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, 21702-9211, USA.
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Martínez-Romero C, García-Sastre A. Against the clock towards new Ebola virus therapies. Virus Res 2015; 209:4-10. [PMID: 26057711 DOI: 10.1016/j.virusres.2015.05.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 05/23/2015] [Accepted: 05/29/2015] [Indexed: 10/23/2022]
Abstract
Since the end of 2013, West Africa has been suffering the largest Ebola virus (EBOV) outbreak in recorded history. The lack of health care infrastructure in the affected countries, as well as a concentration of infected cases in the most populated areas allowed the virus to spread with no control during the first months of the outbreak. With no specific treatment available to combat EBOV infection and its associated disease, an extraordinary worldwide effort was made to confront the severity of the situation and to establish new therapeutic strategies that would lead to better and faster control and eradicate the outbreak. In the last two years, several candidate therapies and potential vaccines against EBOV have arisen and human clinical trials are ongoing, in hopes of starting their deployment in the affected countries. This article reviews the current candidate therapies against EBOV, their stage of development and future prospects in battling EBOV outbreaks.
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Affiliation(s)
- Carles Martínez-Romero
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, USA; Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, USA.
| | - Adolfo García-Sastre
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, USA; Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, USA; Department of Medicine, Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, New York, USA.
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Marzi A, Halfmann P, Hill-Batorski L, Feldmann F, Shupert WL, Neumann G, Feldmann H, Kawaoka Y. Vaccines. An Ebola whole-virus vaccine is protective in nonhuman primates. Science 2015; 348:439-42. [PMID: 25814063 DOI: 10.1126/science.aaa4919] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2014] [Accepted: 03/13/2015] [Indexed: 12/25/2022]
Abstract
Zaire ebolavirus is the causative agent of the current outbreak of hemorrhagic fever disease in West Africa. Previously, we showed that a whole Ebola virus (EBOV) vaccine based on a replication-defective EBOV (EBOVΔVP30) protects immunized mice and guinea pigs against lethal challenge with rodent-adapted EBOV. Here, we demonstrate that EBOVΔVP30 protects nonhuman primates against lethal infection with EBOV. Although EBOVΔVP30 is replication-incompetent, we additionally inactivated the vaccine with hydrogen peroxide; the chemically inactivated vaccine remained antigenic and protective in nonhuman primates. EBOVΔVP30 thus represents a safe, efficacious, whole-EBOV vaccine candidate that differs from other EBOV vaccine platforms in that it presents all viral proteins and the viral RNA to the host immune system, which might contribute to protective immune responses.
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Affiliation(s)
- Andrea Marzi
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA
| | - Peter Halfmann
- Influenza Research Institute, Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI, USA
| | - Lindsay Hill-Batorski
- Influenza Research Institute, Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI, USA
| | - Friederike Feldmann
- Rocky Mountain Veterinary Branch, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA
| | - W Lesley Shupert
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA
| | - Gabriele Neumann
- Influenza Research Institute, Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI, USA
| | - Heinz Feldmann
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA
| | - Yoshihiro Kawaoka
- Influenza Research Institute, Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI, USA. Department of Microbiology and Immunology, Division of Virology, International Research Center for Infectious Diseases, Institute of Medical Science, University of Tokyo, Tokyo. ERATO Infection-Induced Host Responses Project, Japan Science and Technology Agency, Saitama, Japan.
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Warfield KL, Dye JM, Wells JB, Unfer RC, Holtsberg FW, Shulenin S, Vu H, Swenson DL, Bavari S, Aman MJ. Homologous and heterologous protection of nonhuman primates by Ebola and Sudan virus-like particles. PLoS One 2015; 10:e0118881. [PMID: 25793502 PMCID: PMC4368629 DOI: 10.1371/journal.pone.0118881] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 01/23/2015] [Indexed: 11/18/2022] Open
Abstract
Filoviruses cause hemorrhagic fever resulting in significant morbidity and mortality in humans. Several vaccine platforms that include multiple virus-vectored approaches and virus-like particles (VLPs) have shown efficacy in nonhuman primates. Previous studies have shown protection of cynomolgus macaques against homologous infection for Ebola virus (EBOV) and Marburg virus (MARV) following a three-dose vaccine regimen of EBOV or MARV VLPs, as well as heterologous protection against Ravn Virus (RAVV) following vaccination with MARV VLPs. The objectives of the current studies were to determine the minimum number of vaccine doses required for protection (using EBOV as the test system) and then demonstrate protection against Sudan virus (SUDV) and Taï Forest virus (TAFV). Using the EBOV nonhuman primate model, we show that one or two doses of VLP vaccine can confer protection from lethal infection. VLPs containing the SUDV glycoprotein, nucleoprotein and VP40 matrix protein provide complete protection against lethal SUDV infection in macaques. Finally, we demonstrate protective efficacy mediated by EBOV, but not SUDV, VLPs against TAFV; this is the first demonstration of complete cross-filovirus protection using a single component heterologous vaccine within the Ebolavirus genus. Along with our previous results, this observation provides strong evidence that it will be possible to develop and administer a broad-spectrum VLP-based vaccine that will protect against multiple filoviruses by combining only three EBOV, SUDV and MARV components.
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Affiliation(s)
- Kelly L. Warfield
- Integrated Biotherapeutics, Inc., Gaithersburg, Maryland, United States of America
- * E-mail:
| | - John M. Dye
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Jay B. Wells
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Robert C. Unfer
- Integrated Biotherapeutics, Inc., Gaithersburg, Maryland, United States of America
| | | | - Sergey Shulenin
- Integrated Biotherapeutics, Inc., Gaithersburg, Maryland, United States of America
| | - Hong Vu
- Integrated Biotherapeutics, Inc., Gaithersburg, Maryland, United States of America
| | - Dana L. Swenson
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Sina Bavari
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - M. Javad Aman
- Integrated Biotherapeutics, Inc., Gaithersburg, Maryland, United States of America
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47
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Ye L, Yang C. Development of vaccines for prevention of Ebola virus infection. Microbes Infect 2015; 17:98-108. [DOI: 10.1016/j.micinf.2014.12.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 12/07/2014] [Accepted: 12/08/2014] [Indexed: 01/25/2023]
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Tan M, Jiang X. Subviral particle as vaccine and vaccine platform. Curr Opin Virol 2014; 6:24-33. [PMID: 24662314 PMCID: PMC4072748 DOI: 10.1016/j.coviro.2014.02.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 02/28/2014] [Accepted: 02/28/2014] [Indexed: 01/01/2023]
Abstract
Recombinant subvirual particles retain similar antigenic features of their authentic viral capsids and thus have been applied as nonreplicating subunit vaccines against viral infection and illness. Additionally, the self-assembled, polyvalent subviral particles are excellent platforms to display foreign antigens for immune enhancement for vaccine development. These subviral particle-based vaccines are noninfectious and thus safer than the conventional live attenuated and inactivated vaccines. While several VLP vaccines are available in the markets, numerous others, including dual vaccines against more than one pathogen, are under clinical or preclinical development. This article provides an update of these efforts.
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Affiliation(s)
- Ming Tan
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, United States.
| | - Xi Jiang
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, United States
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49
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Abstract
Ebola hemorrhagic fever is one of the most fatal viral diseases worldwide affecting humans and nonhuman primates. Although infections only occur frequently in Central Africa, the virus has the potential to spread globally and is classified as a category A pathogen that could be misused as a bioterrorism agent. As of today there is no vaccine or treatment licensed to counteract Ebola virus infections. DNA, subunit and several viral vector approaches, replicating and non-replicating, have been tested as potential vaccine platforms and their protective efficacy has been evaluated in nonhuman primate models for Ebola virus infections, which closely resemble disease progression in humans. Though these vaccine platforms seem to confer protection through different mechanisms, several of them are efficacious against lethal disease in nonhuman primates attesting that vaccination against Ebola virus infections is feasible.
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Affiliation(s)
- Andrea Marzi
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rocky Mountain Laboratories, Hamilton, Montana 59840, MT, USA
| | - Heinz Feldmann
- Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rocky Mountain Laboratories, Hamilton, Montana 59840, MT, USA
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Martins KAO, Steffens JT, van Tongeren SA, Wells JB, Bergeron AA, Dickson SP, Dye JM, Salazar AM, Bavari S. Toll-like receptor agonist augments virus-like particle-mediated protection from Ebola virus with transient immune activation. PLoS One 2014; 9:e89735. [PMID: 24586996 PMCID: PMC3933660 DOI: 10.1371/journal.pone.0089735] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 01/22/2014] [Indexed: 01/24/2023] Open
Abstract
Identifying safe and effective adjuvants is critical for the advanced development of protein-based vaccines. Pattern recognition receptor (PRR) agonists are increasingly being explored as potential adjuvants, but there is concern that the efficacy of these molecules may be dependent on potentially dangerous levels of non-specific immune activation. The filovirus virus-like particle (VLP) vaccine protects mice, guinea pigs, and nonhuman primates from viral challenge. In this study, we explored the impact of a stabilized dsRNA mimic, polyICLC, on VLP vaccination of C57BL/6 mice and Hartley guinea pigs. We show that at dose levels as low as 100 ng, the adjuvant increased the efficacy of the vaccine in mice. Antigen-specific, polyfunctional CD4 and CD8 T cell responses and antibody responses increased significantly upon inclusion of adjuvant. To determine whether the efficacy of polyICLC correlated with systemic immune activation, we examined serum cytokine levels and cellular activation in the draining lymph node. PolyICLC administration was associated with increases in TNFα, IL6, MCP1, MIP1α, KC, and MIP1β levels in the periphery and with the activation of dendritic cells (DCs), NK cells, and B cells. However, this activation resolved within 24 to 72 hours at efficacious adjuvant dose levels. These studies are the first to examine the polyICLC-induced enhancement of antigen-specific immune responses in the context of non-specific immune activation, and they provide a framework from which to consider adjuvant dose levels.
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Affiliation(s)
- Karen A. O. Martins
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Jesse T. Steffens
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Sean A. van Tongeren
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Jay B. Wells
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Alison A. Bergeron
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Samuel P. Dickson
- Office of Regulated Studies, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - John M. Dye
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | | | - Sina Bavari
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
- * E-mail:
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