1
|
Sanchez-Felipe L, Alpizar YA, Ma J, Coelmont L, Dallmeier K. YF17D-based vaccines - standing on the shoulders of a giant. Eur J Immunol 2024; 54:e2250133. [PMID: 38571392 DOI: 10.1002/eji.202250133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 02/11/2024] [Accepted: 02/16/2024] [Indexed: 04/05/2024]
Abstract
Live-attenuated yellow fever vaccine (YF17D) was developed in the 1930s as the first ever empirically derived human vaccine. Ninety years later, it is still a benchmark for vaccines made today. YF17D triggers a particularly broad and polyfunctional response engaging multiple arms of innate, humoral and cellular immunity. This unique immunogenicity translates into an extraordinary vaccine efficacy and outstanding longevity of protection, possibly by single-dose immunization. More recently, progress in molecular virology and synthetic biology allowed engineering of YF17D as a powerful vector and promising platform for the development of novel recombinant live vaccines, including two licensed vaccines against Japanese encephalitis and dengue, even in paediatric use. Likewise, numerous chimeric and transgenic preclinical candidates have been described. These include prophylactic vaccines against emerging viral infections (e.g. Lassa, Zika and SARS-CoV-2) and parasitic diseases (e.g. malaria), as well as therapeutic applications targeting persistent infections (e.g. HIV and chronic hepatitis), and cancer. Efforts to overcome historical safety concerns and manufacturing challenges are ongoing and pave the way for wider use of YF17D-based vaccines. In this review, we summarize recent insights regarding YF17D as vaccine platform, and how YF17D-based vaccines may complement as well as differentiate from other emerging modalities in response to unmet medical needs and for pandemic preparedness.
Collapse
Affiliation(s)
- Lorena Sanchez-Felipe
- KU Leuven Department of Microbiology, Immunology and Transplantation, Rega Institute, Molecular Vaccinology and Vaccine Discovery, Leuven, Belgium
| | - Yeranddy A Alpizar
- KU Leuven Department of Microbiology, Immunology and Transplantation, Rega Institute, Molecular Vaccinology and Vaccine Discovery, Leuven, Belgium
| | - Ji Ma
- KU Leuven Department of Microbiology, Immunology and Transplantation, Rega Institute, Molecular Vaccinology and Vaccine Discovery, Leuven, Belgium
| | - Lotte Coelmont
- KU Leuven Department of Microbiology, Immunology and Transplantation, Rega Institute, Molecular Vaccinology and Vaccine Discovery, Leuven, Belgium
| | - Kai Dallmeier
- KU Leuven Department of Microbiology, Immunology and Transplantation, Rega Institute, Molecular Vaccinology and Vaccine Discovery, Leuven, Belgium
| |
Collapse
|
2
|
Leng SL, Huang R, Feng YN, Peng LJ, Yang J, Li YH. The pre membrane and envelope protein is the crucial virulence determinant of Japanese encephalitis virus. Microb Pathog 2020; 148:104492. [PMID: 32916243 DOI: 10.1016/j.micpath.2020.104492] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 08/11/2020] [Accepted: 09/06/2020] [Indexed: 01/23/2023]
Abstract
After sequence comparison, it was found that there are multiple amino acid mutations in pre-M and envelope (E) protein of Japanese encephalitis virus vaccine strain comparison with wild type (WT) strain SA14. It is generally acknowledged it is the mutations that have caused the virulence attenuation of vaccine strain, but lack of sufficient experimental evidences. For a better understanding of the mechanism of attenuation of Japanese encephalitis virus (JEV), in this study, we assessed whether prM/E is critical neurovirulence determinants of JEV with infectious cDNA clones technique. Substitutions prM/E of vaccine strain with that of WT SA14 did significantly increase the virulence of JEV to the similar level of wild type SA14, and simultaneously, replacement prM/E of JEV WT strain SA14 with that of vaccine strain SA14-14-2 decreased the virulence of JEV significantly to the similar level of vaccine stain. The results indicate that the prM/E protein is the crucial virulence determinant of Japanese encephalitis virus, although other proteins take part in the process to some extent.
Collapse
Affiliation(s)
- Sheng-Ling Leng
- School of Basic medical science, North Sichuan Medical College, Nanchong, 637000, China
| | - Rong Huang
- School of Basic medical science, North Sichuan Medical College, Nanchong, 637000, China
| | - Ya-Nan Feng
- School of Basic medical science, North Sichuan Medical College, Nanchong, 637000, China
| | - Li-Juan Peng
- School of Basic medical science, North Sichuan Medical College, Nanchong, 637000, China
| | - Jian Yang
- School of Basic medical science, North Sichuan Medical College, Nanchong, 637000, China.
| | - Yu-Hua Li
- Department of Arbovirus Vaccine, National Institutes for Food and Drug Control, Beijing, 100050, China.
| |
Collapse
|
3
|
Yang J, Yang H, Li Z, Lin H, Zhao Y, Wang W, Tan S, Zeng X, Li Y. The chimeric Japanese encephalitis/Dengue 2 virus protects mice from challenge by both dengue virus and JEV virulent virus. Protein Cell 2018; 8:225-229. [PMID: 28124229 PMCID: PMC5326627 DOI: 10.1007/s13238-016-0363-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- Jian Yang
- Department of Viral Vaccine, Chengdu Institute of Biological Products Co., Ltd., Chengdu, 610023, China.,Department of Microbiology and Immunology, North Sichuan Medical College, Nanchong, 637007, China
| | - Huiqiang Yang
- Department of Viral Vaccine, Chengdu Institute of Biological Products Co., Ltd., Chengdu, 610023, China
| | - Zhushi Li
- Department of Viral Vaccine, Chengdu Institute of Biological Products Co., Ltd., Chengdu, 610023, China
| | - Hua Lin
- Department of Viral Vaccine, Chengdu Institute of Biological Products Co., Ltd., Chengdu, 610023, China
| | - Yu Zhao
- Department of Viral Vaccine, Chengdu Institute of Biological Products Co., Ltd., Chengdu, 610023, China
| | - Wei Wang
- Department of Viral Vaccine, Chengdu Institute of Biological Products Co., Ltd., Chengdu, 610023, China
| | - Shuai Tan
- Department of Viral Vaccine, Chengdu Institute of Biological Products Co., Ltd., Chengdu, 610023, China
| | - Xianwu Zeng
- Department of Viral Vaccine, Chengdu Institute of Biological Products Co., Ltd., Chengdu, 610023, China
| | - Yuhua Li
- Department of Arboviruses Vaccine, National Institute for Food and Drug Control, Beijing, 100050, China. .,State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, Chengdu, 610000, China.
| |
Collapse
|
4
|
Recovery of West Nile Virus Envelope Protein Domain III Chimeras with Altered Antigenicity and Mouse Virulence. J Virol 2016; 90:4757-4770. [PMID: 26912625 DOI: 10.1128/jvi.02861-15] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 02/20/2016] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED Flaviviruses are positive-sense, single-stranded RNA viruses responsible for millions of human infections annually. The envelope (E) protein of flaviviruses comprises three structural domains, of which domain III (EIII) represents a discrete subunit. The EIII gene sequence typically encodes epitopes recognized by virus-specific, potently neutralizing antibodies, and EIII is believed to play a major role in receptor binding. In order to assess potential interactions between EIII and the remainder of the E protein and to assess the effects of EIII sequence substitutions on the antigenicity, growth, and virulence of a representative flavivirus, chimeric viruses were generated using the West Nile virus (WNV) infectious clone, into which EIIIs from nine flaviviruses with various levels of genetic diversity from WNV were substituted. Of the constructs tested, chimeras containing EIIIs from Koutango virus (KOUV), Japanese encephalitis virus (JEV), St. Louis encephalitis virus (SLEV), and Bagaza virus (BAGV) were successfully recovered. Characterization of the chimeras in vitro and in vivo revealed differences in growth and virulence between the viruses, within vivo pathogenesis often not being correlated within vitro growth. Taken together, the data demonstrate that substitutions of EIII can allow the generation of viable chimeric viruses with significantly altered antigenicity and virulence. IMPORTANCE The envelope (E) glycoprotein is the major protein present on the surface of flavivirus virions and is responsible for mediating virus binding and entry into target cells. Several viable West Nile virus (WNV) variants with chimeric E proteins in which the putative receptor-binding domain (EIII) sequences of other mosquito-borne flaviviruses were substituted in place of the WNV EIII were recovered, although the substitution of several more divergent EIII sequences was not tolerated. The differences in virulence and tissue tropism observed with the chimeric viruses indicate a significant role for this sequence in determining the pathogenesis of the virus within the mammalian host. Our studies demonstrate that these chimeras are viable and suggest that such recombinant viruses may be useful for investigation of domain-specific antibody responses and the more extensive definition of the contributions of EIII to the tropism and pathogenesis of WNV or other flaviviruses.
Collapse
|
5
|
Yang H, Li Z, Lin H, Wang W, Yang J, Liu L, Zeng X, Wu Y, Yu Y, Li Y. A novel dengue virus serotype 1 vaccine candidate based on Japanese encephalitis virus vaccine strain SA14-14-2 as the backbone. Arch Virol 2016; 161:1517-26. [PMID: 26976137 DOI: 10.1007/s00705-016-2817-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 03/03/2016] [Indexed: 01/08/2023]
|
6
|
Saiyasombat R, Carrillo-Tripp J, Miller WA, Bredenbeek PJ, Blitvich BJ. Substitution of the premembrane and envelope protein genes of Modoc virus with the homologous sequences of West Nile virus generates a chimeric virus that replicates in vertebrate but not mosquito cells. Virol J 2014; 11:150. [PMID: 25151534 PMCID: PMC4148964 DOI: 10.1186/1743-422x-11-150] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 08/19/2014] [Indexed: 11/23/2022] Open
Abstract
Background Most known flaviviruses, including West Nile virus (WNV), are maintained in natural transmission cycles between hematophagous arthropods and vertebrate hosts. Other flaviviruses such as Modoc virus (MODV) and Culex flavivirus (CxFV) have host ranges restricted to vertebrates and insects, respectively. The genetic elements that modulate the differential host ranges and transmission cycles of these viruses have not been identified. Methods Fusion polymerase chain reaction (PCR) was used to replace the capsid (C), premembrane (prM) and envelope (E) genes and the prM-E genes of a full-length MODV infectious cDNA clone with the corresponding regions of WNV and CxFV. Fusion products were directly transfected into baby hamster kidney-derived cells that stably express T7 RNA polymerase. At 4 days post-transfection, aliquots of each supernatant were inoculated onto vertebrate (BHK-21 and Vero) and mosquito (C6/36) cells which were then assayed for evidence of viral infection by reverse transcription-PCR, Western blot and plaque assay. Results Chimeric virus was recovered in cells transfected with the fusion product containing the prM-E genes of WNV. The virus could infect vertebrate but not mosquito cells. The in vitro replication kinetics and yields of the chimeric virus were similar to MODV but the chimeric virus produced larger plaques. Chimeric virus was not recovered in cells transfected with any of the other fusion products. Conclusions Our data indicate that genetic elements outside of the prM-E gene region of MODV condition its vertebrate-specific phenotype.
Collapse
Affiliation(s)
| | | | | | | | - Bradley J Blitvich
- Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA.
| |
Collapse
|
7
|
Sjatha F, Kuwahara M, Sudiro TM, Kameoka M, Konishi E. Evaluation of chimeric DNA vaccines consisting of premembrane and envelope genes of Japanese encephalitis and dengue viruses as a strategy for reducing induction of dengue virus infection-enhancing antibody response. Microbiol Immunol 2014; 58:126-34. [DOI: 10.1111/1348-0421.12125] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 11/26/2013] [Accepted: 12/10/2013] [Indexed: 12/30/2022]
Affiliation(s)
- Fithriyah Sjatha
- Department of Vaccinology; Center for Infectious Diseases; Kobe University Graduate School of Medicine
| | - Miwa Kuwahara
- Department of International Health; Kobe University Graduate School of Health Sciences; Kobe Japan
| | | | - Masanori Kameoka
- Department of Vaccinology; Center for Infectious Diseases; Kobe University Graduate School of Medicine
- Department of International Health; Kobe University Graduate School of Health Sciences; Kobe Japan
| | - Eiji Konishi
- Department of Vaccinology; Center for Infectious Diseases; Kobe University Graduate School of Medicine
- BIKEN Endowed Department of Dengue Vaccine Development; Faculty of Tropical Medicine; Mahidol University; Bangkok Thailand
| |
Collapse
|
8
|
Lima DM, Paula SOD, França RFDO, Palma PV, Morais FR, Gomes-Ruiz AC, Aquino MTPD, Fonseca BALD. A DNA vaccine candidate encoding the structural prM/E proteins elicits a strong immune response and protects mice against dengue-4 virus infection. Vaccine 2011; 29:831-8. [DOI: 10.1016/j.vaccine.2010.10.078] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 10/27/2010] [Accepted: 10/29/2010] [Indexed: 01/28/2023]
|
9
|
Pripuzova NS, Tereshkina NV, Gmyl LV, Dzhivanyan TI, Rumyantsev AA, Romanova LI, Mustafina AN, Lashkevich VA, Karganova GG. Safety evaluation of chimeric Langat/Dengue 4 flavivirus, a live vaccine candidate against tick-borne encephalitis. J Med Virol 2009; 81:1777-85. [DOI: 10.1002/jmv.21587] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
10
|
Ishikawa T, Widman DG, Bourne N, Konishi E, Mason PW. Construction and evaluation of a chimeric pseudoinfectious virus vaccine to prevent Japanese encephalitis. Vaccine 2008; 26:2772-81. [PMID: 18433947 DOI: 10.1016/j.vaccine.2008.03.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Revised: 03/01/2008] [Accepted: 03/11/2008] [Indexed: 11/17/2022]
Abstract
Multiple vaccines exist to control Japanese encephalitis (JE), but all suffer from problems. We have developed a new type of flavivirus vaccine, a pseudoinfectious virus (RepliVAX WN) that prevents West Nile virus (WNV)-induced disease. Here, we describe production of a chimeric RepliVAX (RepliVAX JE) that expresses the JE virus (JEV) prM and E proteins. Our prototype RepliVAX JE replicated poorly in cells, but blind passage produced a better-growing derivative, and analyses of this derivative allowed us to engineer a second-generation RepliVAX (RepliVAX JE.2) that grew to high titers. RepliVAX JE.2 elicited neutralizing antibodies in both mice and hamsters and provided 100% protection from a lethal challenge with JEV or WNV, respectively. These results demonstrate the utility our RepliVAX platform for producing a JE vaccine.
Collapse
Affiliation(s)
- Tomohiro Ishikawa
- Department of Pathology, University of Texas Medical Branch (UTMB), 301 University Boulevard, Galveston, TX 77555-0436, United States
| | | | | | | | | |
Collapse
|
11
|
Maeda J, Takagi H, Hashimoto S, Kurane I, Maeda A. A PCR-based protocol for generating West Nile virus replicons. J Virol Methods 2008; 148:244-52. [PMID: 18242719 DOI: 10.1016/j.jviromet.2007.12.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Revised: 12/03/2007] [Accepted: 12/13/2007] [Indexed: 11/26/2022]
Abstract
A new protocol for the generation of West Nile virus (WNV) replicons was developed. Fragmented cDNAs that covered the entire WNV RNA sequence, except the sequence corresponding to nucleotides 190-2379, were amplified separately by polymerase chain reactions (PCRs) using primer set franking with overlapping sequences of 40-50 bp at the 5'- and the 3'-ends of each fragment. All amplified fragments were mixed together and annealed to each other at the overlapping sequences. The annealed-DNA fragments were elongated by DNA polymerase and amplified by short-cycle PCRs to generate full-sized WNV replicon cDNAs. The WNV replicons were transcribed in vitro using the replicon cDNAs as templates. When the in vitro-transcribed replicon was introduced into mammalian cells, the viral envelope protein and viral positive- and negative-strand RNAs were detected in the replicon-transfected cells. It is noteworthy that the synthesis of the replicon cDNAs and the replicons took just 1 week, and that the use of a high-fidelity DNA polymerase afforded stability to the sequence of the synthetic replicon.
Collapse
Affiliation(s)
- Junko Maeda
- Department of Prion Diseases, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
| | | | | | | | | |
Collapse
|
12
|
Yoshii K, Goto A, Kawakami K, Kariwa H, Takashima I. Construction and application of chimeric virus-like particles of tick-borne encephalitis virus and mosquito-borne Japanese encephalitis virus. J Gen Virol 2008; 89:200-211. [DOI: 10.1099/vir.0.82824-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We have previously reported a system for packaging tick-borne encephalitis (TBE) virus subgenomic replicon RNAs into single-round infectious virus-like particles (VLPs) by using in
trans expression of viral C/prM/E structural proteins. In this study, the trans-packaging system was applied to the generation of chimeric VLPs with mosquito-borne Japanese encephalitis (JE) virus. Although trans-expression of TBE virus C and JE virus prM/E proteins resulted in the secretion of VLPs, the expression of JE virus C/prM/E proteins did not lead to the secretion of VLPs, suggesting that homologous interaction between C and non-structural proteins or the genomic RNA is important for efficient assembly of infectious particles. Neutralization testing showed that the antigenic characteristics of the VLPs were similar to those of the native virus. Furthermore, the infectivities of the TBE virus- and JE virus-enveloped VLPs for the ISE6 tick cell line and C6/36 mosquito cell line were investigated. The VLPs were able to enter only those cells that were derived from the natural vectors for the respective viruses. TBE virus replicon RNA packaged in VLPs produced TBE virus non-structural proteins in tick cells, but could neither replicate nor produce viral proteins in mosquito cells. These findings indicate the importance of specific cellular factors for virus entry and replication during flavivirus infection of arthropods. These results demonstrate that chimeric VLPs are useful tools for the study of viral genome packaging and cellular factors involved in vector specificity, with the additional safety aspect that these chimeric VLPs can be used instead of full-length chimeric viruses.
Collapse
Affiliation(s)
- Kentaro Yoshii
- Laboratory of Public Health, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
| | - Akiko Goto
- Laboratory of Public Health, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
| | - Kazue Kawakami
- Laboratory of Public Health, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
| | - Hiroaki Kariwa
- Laboratory of Public Health, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
| | - Ikuo Takashima
- Laboratory of Public Health, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
| |
Collapse
|
13
|
Chambers TJ, Droll DA, Jiang X, Wold WSM, Nickells JA. JE Nakayama/JE SA14-14-2 virus structural region intertypic viruses: biological properties in the mouse model of neuroinvasive disease. Virology 2007; 366:51-61. [PMID: 17521693 PMCID: PMC2266982 DOI: 10.1016/j.virol.2007.04.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2007] [Revised: 02/04/2007] [Accepted: 04/07/2007] [Indexed: 11/19/2022]
Abstract
A molecular clone of Japanese encephalitis (JE) virus Nakayama strain was used to create intertypic viruses containing either the 5'-C-prM-E or the prM-E region of the attenuated JE SA14-14-2 virus in the JE Nakayama background. These two intertypic JE viruses, JE-X/5'CprME(S) and JE-X/prME(S), respectively, generally resembled the parental JE virus in cell culture properties. Similar to virus derived from the JE Nakayama molecular clone (JE-XJN), JE-X/prME(S) was highly neuroinvasive and neurovirulent for young adult mice, whereas JE-X/5'CprME(S) was attenuated for neuroinvasiveness and only partially attenuated for neurovirulence. Immunization of young mice with JE-X/5'CprME(S) virus elicited neutralizing antibodies against JE Nakayama virus and conferred protection against encephalitis following challenge with JE Nakayama virus. The sequence of the JE-X/5'CprME(S) virus differed from that of JE-X/prME(S) virus at two nucleotides in the 5' UTR, 3 amino acid positions in the capsid protein, 4 positions in the prM protein and 1 in the envelope protein. For JE-X/prME(S) virus, the 4 differences in prM and the single substitution in the envelope represented reversions to the sequence of JE Nakayama virus. Overall, this study reveals that molecular determinants associated with the prM-E region of the attenuated JE SA14-14-2 virus are insufficient by themselves to confer an attenuation phenotype upon JE Nakayama virus. This suggests a role for determinants in the 5' UTR and/or the capsid protein of the JE SA 14-14-2 virus genome in influencing the virulence properties of the JE Nakayama virus in the mouse model.
Collapse
Affiliation(s)
- Thomas J Chambers
- Department of Molecular Microbiology and Immunology, St. Louis University School of Medicine, 1402 South Grand Ave. St. Louis, MO 63104, USA.
| | | | | | | | | |
Collapse
|
14
|
Chambers TJ, Jiang X, Droll DA, Liang Y, Wold WSM, Nickells J. Chimeric Japanese encephalitis virus/dengue 2 virus infectious clone: biological properties, immunogenicity and protection against dengue encephalitis in mice. J Gen Virol 2006; 87:3131-3140. [PMID: 17030845 DOI: 10.1099/vir.0.81909-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A molecular clone of Japanese encephalitis virus (JE virus) was derived from the JE virus Nakayama strain and used to produce infectious JE virus in cell culture. The engineered JE virus resembled the parental JE virus in cell-culture properties and was related closely to other JE virus strains based on nucleotide sequence analysis. The JE virus clone was used as a genetic background for construction of a chimeric virus containing the structural proteins prM and E of Dengue virus, serotype 2. The chimeric JE/dengue 2 virus generated authentic dengue 2 structural proteins as assessed by immunoassays for the dengue E protein. It exhibited a small plaque size and less efficient growth in various cell lines than the parental JE virus. JE/dengue 2 virus was non-neuroinvasive for young adult mice, but displayed partial neurovirulence at doses up to 4 log p.f.u. given intracerebrally. Immunization of 3-week-old mice with JE/dengue 2 virus yielded neutralizing-antibody titres against dengue 2 virus and conferred protection against dengue encephalitis caused by neuroadapted dengue 2 virus. A rise in post-challenge neutralizing-antibody titres against dengue 2 virus in surviving mice suggests that immunization is associated with establishment of a memory antibody response in this model. This study demonstrates the capacity of JE virus to serve as a vector for expression of heterologous flavivirus structural proteins. Similar to previous studies with other chimeric flaviviruses, this approach may be useful as a genetic system for engineering experimental vaccines against Dengue virus and other medically important flaviviruses.
Collapse
Affiliation(s)
- Thomas J Chambers
- Department of Molecular Microbiology and Immunology, St Louis University School of Medicine, 1402 South Grand Avenue, St Louis, MO 63104, USA
| | - Xiaoshan Jiang
- Department of Molecular Microbiology and Immunology, St Louis University School of Medicine, 1402 South Grand Avenue, St Louis, MO 63104, USA
| | - Deborah A Droll
- Department of Molecular Microbiology and Immunology, St Louis University School of Medicine, 1402 South Grand Avenue, St Louis, MO 63104, USA
| | - Yan Liang
- Department of Molecular Microbiology and Immunology, St Louis University School of Medicine, 1402 South Grand Avenue, St Louis, MO 63104, USA
| | - William S M Wold
- Department of Molecular Microbiology and Immunology, St Louis University School of Medicine, 1402 South Grand Avenue, St Louis, MO 63104, USA
| | - Janice Nickells
- Department of Molecular Microbiology and Immunology, St Louis University School of Medicine, 1402 South Grand Avenue, St Louis, MO 63104, USA
| |
Collapse
|