Development of a high-growth enterovirus 71 vaccine candidate inducing cross-reactive neutralizing antibody responses
Autor: | Min-Yuan Chia, Chun-Hsiung Wang, Wei-Hau Chang, Wan-Yu Chung, Min-Shi Lee |
---|---|
Rok vydání: | 2017 |
Předmět: |
0301 basic medicine
Serotype 030106 microbiology Cross Reactions Virus 03 medical and health sciences Immunogenicity Vaccine Chlorocebus aethiops Enterovirus 71 Animals Alum adjuvant Neutralizing antibody Vero Cells General Veterinary General Immunology and Microbiology biology Public Health Environmental and Occupational Health Virion Genetic Variation Viral Vaccines biology.organism_classification Virology Antibodies Neutralizing Enterovirus A Human Titer 030104 developmental biology Infectious Diseases biology.protein Vero cell Molecular Medicine Rabbits Antibody |
Zdroj: | Vaccine. 36(9) |
ISSN: | 1873-2518 |
Popis: | Although Enterovirus 71 (EV71) has only one serotype based on serum neutralization tests using hyperimmune animal antisera, three major genogroups (A, B and C) including eleven genotypes (A, B1-B2, and C1-C5) can be well classified based on phylogenetic analysis. Since 1997, large-scale EV71 epidemics occurred cyclically with different genotypes in the Asia-Pacific region. Therefore, development of EV71 vaccines is a national priority in several Asian countries. Currently, five vaccine candidates have been evaluated in clinical trials in China (three C4 candidates), Singapore (one B2 candidate), and Taiwan (one B4 candidate). Overall, the peak viral titers of these 5 vaccine candidates could only reach about 107 TCID50/mL. Moreover, genotypes of these 5 candidates are different from the current predominant genotype B5 in Taiwan and South-Eastern Asia. We adapted a high-growth EV71 genotype B5 (HG-B5) virus after multiple passages and plaque selections in Vero cells and the HG-B5 virus could reach high titers (>108 TCID50/mL) in a microcarrier-based cell culture system. The viral particles were further purified and formulated with alum adjuvant. After two doses of intramuscular immunization in rabbits, the HG-B5 vaccine candidate could induce cross-reactive neutralizing antibodies against the three major EV71 genogroups. In conclusion, a high-growth EV71 virus was successfully adapted in Vero cells and could induce broad spectrum neutralizing antibody titers against three (A, B5, and C4) genotypes in rabbits. |
Databáze: | OpenAIRE |
Externí odkaz: |