Maturation process of Japanese encephalitis virus in cultured mosquito cells in vitro and mouse brain cells in vivo

1987 ◽  
Vol 96 (3-4) ◽  
pp. 135-151 ◽  
Author(s):  
T. Hase ◽  
P. L. Summers ◽  
K. H. Eckels ◽  
W. B. Baze
Keyword(s):  
Japanese Encephalitis Virus ◽  
Mouse Brain ◽  
Japanese Encephalitis ◽  
Encephalitis Virus ◽  
Brain Cells ◽  
Maturation Process ◽  
Mosquito Cells

scholarly journals Potential Role of Birds in Japanese Encephalitis Virus Zoonotic Transmission and Genotype Shift

Viruses ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 357
Author(s):  
Muddassar Hameed ◽  
Abdul Wahaab ◽  
Mohsin Nawaz ◽  
Sawar Khan ◽  
Jawad Nazir ◽  
...  
Keyword(s):  
Japanese Encephalitis Virus ◽  
Japanese Encephalitis ◽  
Encephalitis Virus ◽  
Zoonotic Transmission ◽  
In Vivo Studies ◽  
Genotype I ◽  
Genotype Iii

Japanese encephalitis (JE) is a vaccine-preventable disease caused by the Japanese encephalitis virus (JEV), which is primarily prevalent in Asia. JEV is a Flavivirus, classified into a single serotype with five genetically distinct genotypes (I, II, III, IV, and V). JEV genotype III (GIII) had been the most dominant strain and caused numerous outbreaks in the JEV endemic countries until 1990. However, recent data shows the emergence of JEV genotype I (GI) as a dominant genotype and it is gradually displacing GIII. The exact mechanism of this genotype displacement is still unclear. The virus can replicate in mosquito vectors and vertebrate hosts to maintain its zoonotic life cycle; pigs and aquatic wading birds act as an amplifying/reservoir hosts, and the humans and equines are dead-end hosts. The important role of pigs as an amplifying host for the JEV is well known. However, the influence of other domestic animals, especially birds, that live in high abundance and close proximity to the human is not well studied. Here, we strive to briefly highlight the role of birds in the JEV zoonotic transmission, discovery of birds as a natural reservoirs and amplifying host for JEV, species of birds susceptible to the JEV infection, and the proposed effect of JEV on the poultry industry in the future, a perspective that has been neglected for a long time. We also discuss the recent in vitro and in vivo studies that show that the newly emerged GI viruses replicated more efficiently in bird-derived cells and ducklings/chicks than GIII, and an important role of birds in the JEV genotype shift from GIII to GI.

scholarly journals A Single Amino Acid Substitution in the NS2A Protein of Japanese Encephalitis Virus Affects Virus PropagationIn Vitrobut NotIn Vivo

2015 ◽  
Vol 89 (11) ◽  
pp. 6126-6130 ◽  
Author(s):  
Yuki Takamatsu ◽  
Kouichi Morita ◽  
Daisuke Hayasaka
Keyword(s):  
Amino Acid ◽  
Japanese Encephalitis Virus ◽  
Japanese Encephalitis ◽  
Encephalitis Virus ◽  
Single Amino Acid ◽  
Virus Propagation ◽  
Viral Loads ◽  
Unique Amino Acid

We identified a unique amino acid of NS2A113, phenylalanine, that affects the efficient propagation of two Japanese encephalitis virus strains, JaTH160 and JaOArS982, in neuroblastoma Neuro-2a cells but not in cell lines of extraneural origin. This amino acid did not affect viral loads in the brain or survival curves in mice. These findings suggest that virus propagationin vitromay not reflect the level of virus neuroinvasivenessin vivo.

scholarly journals Potential Role of Birds in Japanese Encephalitis Virus Zoonotic Transmission and Genotype Shift

2021 ◽  
Author(s):  
Muddassar hameed ◽  
Abdul wahaab ◽  
mohsin nawaz ◽  
sawar khan ◽  
Jawad Nazir ◽  
...  
Keyword(s):  
Japanese Encephalitis Virus ◽  
Japanese Encephalitis ◽  
Encephalitis Virus ◽  
Zoonotic Transmission ◽  
In Vivo Studies ◽  
Future Perspective ◽  
Genotype I

Japanese encephalitis (JE) is a vaccine preventable disease caused by the Japanese encephalitis virus (JEV), which is primarily prevalent in Asia. JEV is a Flavivirus, classified into a single serotype with five genetically distinct genotypes (I, II, III, IV, and V). JEV genotype III (GIII) had been the most dominant strain and caused numerous out breaks in the JEV endemic countries until 1990. However, recent data shows the emergence of genotype I (GI) as a dominant genotype and it is gradually displacing GIII. The exact mechanism of this genotype displacement is still unclear. The virus can replicate in mosquito vectors and vertebrate hosts to maintain its zoonotic life cycle; pigs and aquatic wading birds act as an amplifying/reservoir hosts, and humans and equines are the dead end hosts. The important role of pigs as an amplifying host for JEV is well known. However, the influence of other domestic animals especially birds that live in high abundance and close proximity to human is not well studied. Here, we strive to briefly highlight the role of birds in JEV zoonotic transmission, discovery of birds as a natural reservoirs and amplifying host for JEV, species of birds susceptible to JEV infection, and the proposed effect of JEV on poultry industry in future perspective which have been neglected for a long times. We also discussed the recent in vitro and in vivo studies which show that the newly emerged GI viruses replicated more efficiently in bird-derived cells and ducklings/chicks than GIII, and an important role of birds in the JEV genotype shift from GIII to GI.

A tripeptide (NSK) inhibits Japanese encephalitis virus infection in vitro and in vivo

2013 ◽  
Vol 159 (5) ◽  
pp. 1045-1055 ◽  
Author(s):  
Chen Li ◽  
Ling-ling Ge ◽  
Ya-ling Yu ◽  
Li Huang ◽  
Yue Wang ◽  
...  
Keyword(s):  
Virus Infection ◽  
Japanese Encephalitis Virus ◽  
Japanese Encephalitis ◽  
Encephalitis Virus ◽  
Japanese Encephalitis Virus Infection

scholarly journals Humanized Monoclonal Antibodies Derived from Chimpanzee Fabs Protect against Japanese Encephalitis Virus In Vitro and In Vivo

2008 ◽  
Vol 82 (14) ◽  
pp. 7009-7021 ◽  
Author(s):  
Ana P. Goncalvez ◽  
Cheng-Hsin Chien ◽  
Kamolchanok Tubthong ◽  
Inna Gorshkova ◽  
Carrie Roll ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Japanese Encephalitis Virus ◽  
Japanese Encephalitis ◽  
Neutralizing Antibodies ◽  
Therapeutic Potential ◽  
Encephalitis Virus ◽  
Domain Iii ◽  
Humanized Monoclonal Antibodies

ABSTRACT Japanese encephalitis virus (JEV)-specific Fab antibodies were recovered by repertoire cloning from chimpanzees initially immunized with inactivated JE-VAX and then boosted with attenuated JEV SA14-14-2. From a panel of 11 Fabs recovered by different panning strategies, three highly potent neutralizing antibodies, termed Fabs A3, B2, and E3, which recognized spatially separated regions on the virion, were identified. These antibodies reacted with epitopes in different domains: the major determinant for Fab A3 was Lys179 (domain I), that for Fab B2 was Ile126 (domain II), and that for Fab E3 was Gly302 (domain III) in the envelope protein, suggesting that these antibodies neutralize the virus by different mechanisms. Potent neutralizing antibodies reacted with a low number of binding sites available on the virion. These three Fabs and derived humanized monoclonal antibodies (MAbs) exhibited high neutralizing activities against a broad spectrum of JEV genotype strains. Demonstration of antibody-mediated protection of JEV infection in vivo is provided using the mouse encephalitis model. MAb B2 was most potent, with a 50% protective dose (ED50) of 0.84 μg, followed by MAb A3 (ED50 of 5.8 μg) and then MAb E3 (ED50 of 24.7 μg) for a 4-week-old mouse. Administration of 200 μg/mouse of MAb B2 1 day after otherwise lethal JEV infection protected 50% of mice and significantly prolonged the average survival time compared to that of mice in the unprotected group, suggesting a therapeutic potential for use of MAb B2 in humans.

The NS3 and NS4A genes as the targets of RNA interference inhibit replication of Japanese encephalitis virus in vitro and in vivo

Gene ◽  
2016 ◽  
Vol 594 (2) ◽  
pp. 183-189 ◽  
Author(s):  
Lei Yuan ◽  
Rui Wu ◽  
Hanyang Liu ◽  
Xintian Wen ◽  
Xiaobo Huang ◽  
...  
Keyword(s):  
Rna Interference ◽  
Japanese Encephalitis Virus ◽  
Japanese Encephalitis ◽  
Encephalitis Virus

scholarly journals Characterization of a serine-to-asparagine substitution at position 123 in the Japanese encephalitis virus E protein

2013 ◽  
Vol 94 (1) ◽  
pp. 90-96 ◽  
Author(s):  
Yukie Yamaguchi ◽  
Yoko Nukui ◽  
Akira Kotaki ◽  
Kyoko Sawabe ◽  
Masayuki Saijo ◽  
...  
Keyword(s):  
Japanese Encephalitis Virus ◽  
Japanese Encephalitis ◽  
Amino Acid Position ◽  
Encephalitis Virus ◽  
Viral Growth ◽  
E Protein ◽  
Growth Properties ◽  
Mosquito Cell Lines

Amino acid position 123 in the E protein of Japanese encephalitis virus (JEV) determines viral growth properties and pathogenicity. The majority of JEV strains have a serine residue at this position (E123S); however, JEV with an asparagine residue (E123N) has also been isolated. To compare the growth properties and pathogenicity of E123S and E123N JEV, we produced recombinant JEV with a serine-to-asparagine substitution at position 123 (rJEV-Mie41-ES123N) in the E123S-type strain Mie/41/2002 background. The growth rate of rJEV-Mie41-ES123N was similar to that of Mie/41/2002 in mammalian and mosquito cell lines. Mouse challenge experiments showed that there was only a slight difference in neuroinvasiveness between the parent strain (Mie/41/2002) and rJEV-Mie41-ES123N. Thus, our results indicate that the Ser-to-Asn substitution in the JEV E protein has weak impact on viral growth properties in vitro or on pathogenicity in vivo.

scholarly journals Mouse and Human Monoclonal Antibodies Protect against Infection by Multiple Genotypes of Japanese Encephalitis Virus

mBio ◽  
2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Estefania Fernandez ◽  
Nurgun Kose ◽  
Melissa A. Edeling ◽  
Jagat Adhikari ◽  
Gopal Sapparapu ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Japanese Encephalitis Virus ◽  
Japanese Encephalitis ◽  
Viral Encephalitis ◽  
Encephalitis Virus ◽  
Site Directed Mutagenesis ◽  
Genotype Distribution ◽  
Genotype I

ABSTRACTJapanese encephalitis virus (JEV) remains a leading cause of viral encephalitis worldwide. Although JEV-specific antibodies have been described, an assessment of their ability to neutralize multiple genotypes of JEV has been limited. Here, we describe the development of a panel of mouse and human neutralizing monoclonal antibodies (MAbs) that inhibit infection in cell culture of four different JEV genotypes tested. Mechanism-of-action studies showed that many of these MAbs inhibited infection at a postattachment step, including blockade of virus fusion. Mapping studies using site-directed mutagenesis and hydrogen-deuterium exchange with mass spectrometry revealed that the lateral ridge on domain III of the envelope protein was a primary recognition epitope for our panel of strongly neutralizing MAbs. Therapeutic studies in mice demonstrated protection against lethality caused by genotype I and III strains when MAbs were administered as a single dose even 5 days after infection. This information may inform the development of vaccines and therapeutic antibodies as emerging strains and genotypic shifts become more prevalent.IMPORTANCEAlthough Japanese encephalitis virus (JEV) is a vaccine-preventable cause of viral encephalitis, the inactivated and live attenuated platforms available are derived from strains belonging to a single genotype (GIII) due to its historical prevalence in areas of JEV epidemics. Related to this, studies with vaccines and antibodies have focused on assessing thein vitroandin vivoprotective responses to homologous or heterologous GIII strains. An epidemiological shift in JEV genotype distribution warrants the induction of broadly neutralizing antibody responses that inhibit infection of multiple JEV genotypes. Here, we generated a panel of mouse and human neutralizing monoclonal antibodies and evaluated their inhibitory activity, epitope location, and capacity for protection against multiple JEV genotypes in mice.

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