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Immunogenicity, safety, and tolerability of a recombinant measles-virus-based chikungunya vaccine: a randomised, double-blind, placebo-controlled, active-comparator, first-in-man trial. THE LANCET. INFECTIOUS DISEASES 2015; 15:519-27. [DOI: 10.1016/s1473-3099(15)70043-5] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Tretyakova I, Nickols B, Hidajat R, Jokinen J, Lukashevich IS, Pushko P. Plasmid DNA initiates replication of yellow fever vaccine in vitro and elicits virus-specific immune response in mice. Virology 2014; 468-470:28-35. [PMID: 25129436 DOI: 10.1016/j.virol.2014.07.050] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Revised: 07/12/2014] [Accepted: 07/27/2014] [Indexed: 12/30/2022]
Abstract
Yellow fever (YF) causes an acute hemorrhagic fever disease in tropical Africa and Latin America. To develop a novel experimental YF vaccine, we applied iDNA infectious clone technology. The iDNA represents plasmid that encodes the full-length RNA genome of 17D vaccine downstream from a cytomegalovirus (CMV) promoter. The vaccine was designed to transcribe the full-length viral RNA and to launch 17D vaccine virus in vitro and in vivo. Transfection with 10 ng of iDNA plasmid was sufficient to start replication of vaccine virus in vitro. Safety of the parental 17D and iDNA-derived 17D viruses was confirmed in AG129 mice deficient in receptors for IFN-α/β/γ. Finally, direct vaccination of BALB/c mice with a single 20 μg dose of iDNA plasmid resulted in seroconversion and elicitation of virus-specific neutralizing antibodies in animals. We conclude that iDNA immunization approach combines characteristics of DNA and attenuated vaccines and represents a promising vaccination strategy for YF.
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Affiliation(s)
- Irina Tretyakova
- Medigen, Inc., 8420 Gas House Pike, Suite S, Frederick, MD 21701, USA
| | - Brian Nickols
- Medigen, Inc., 8420 Gas House Pike, Suite S, Frederick, MD 21701, USA
| | - Rachmat Hidajat
- Medigen, Inc., 8420 Gas House Pike, Suite S, Frederick, MD 21701, USA
| | - Jenny Jokinen
- Department of Pharmacology and Toxicology, School of Medicine, Center for Predictive Medicine and Emerging Infectious Diseases, University of Louisville, Louisville, KY, USA
| | - Igor S Lukashevich
- Department of Pharmacology and Toxicology, School of Medicine, Center for Predictive Medicine and Emerging Infectious Diseases, University of Louisville, Louisville, KY, USA
| | - Peter Pushko
- Medigen, Inc., 8420 Gas House Pike, Suite S, Frederick, MD 21701, USA.
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Kam YW, Lee WWL, Simarmata D, Le Grand R, Tolou H, Merits A, Roques P, Ng LFP. Unique epitopes recognized by antibodies induced in Chikungunya virus-infected non-human primates: implications for the study of immunopathology and vaccine development. PLoS One 2014; 9:e95647. [PMID: 24755730 PMCID: PMC3995782 DOI: 10.1371/journal.pone.0095647] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Accepted: 03/28/2014] [Indexed: 11/17/2022] Open
Abstract
Chikungunya virus (CHIKV) is an Alphavirus that causes chronic and incapacitating arthralgia in humans. Although patient cohort studies have shown the production of CHIKV specific antibodies, the fine specificity of the antibody response against CHIKV is not completely defined. The macaque model of CHIKV infection was established due to limitations of clinical specimens. More importantly, its close relation to humans will allow the study of chronic infection and further identify important CHIKV targets. In this study, serum samples from CHIKV-infected macaques collected at different time-points post infection were used to characterize the antibody production pattern and kinetics. Results revealed that anti-CHIKV antibodies were neutralizing and the E2 glycoprotein, Capsid, nsP1, nsP3 and nsP4 proteins were targets of the anti-CHIKV antibody response in macaques. Furthermore, linear B-cell epitopes recognized by these anti-CHIKV antibodies were identified, and mapped to their structural localization. This characterizes the specificity of anti-CHIKV antibody response in macaques and further demonstrates the importance of the different regions in CHIKV-encoded proteins in the adaptive immune response. Information from this study provides critical knowledge that will aid in the understanding of CHIKV infection and immunity, vaccine design, and pre-clinical efficacy studies.
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Affiliation(s)
- Yiu-Wing Kam
- Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore, Singapore
| | - Wendy W L Lee
- Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore, Singapore; NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, Singapore
| | - Diane Simarmata
- Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore, Singapore
| | - Roger Le Grand
- CEA, Division of ImmunoVirology (SIV), Institute of Emerging Diseases and Innovative Therapies (IMETI), Fontenay-aux-Roses, France; Université Paris-Sud 11, UMR E1, Orsay, France
| | - Hugues Tolou
- Groupe d'Etude en Préventologie (GEP), Villenave d'Ornon, France
| | - Andres Merits
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Pierre Roques
- CEA, Division of ImmunoVirology (SIV), Institute of Emerging Diseases and Innovative Therapies (IMETI), Fontenay-aux-Roses, France; Université Paris-Sud 11, UMR E1, Orsay, France
| | - Lisa F P Ng
- Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore, Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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