Generation of Live Attenuated Novel Influenza Virus A/California/7/09 (H1N1) Vaccines with High Yield in Embryonated Chicken Eggs ▿
| Autor: | Cindy Shambaugh, Amorsolo L. Suguitan, Hong Jin, Zhongying Chen, Lomi Kim, Jackie Zhao, Helen Zhou, George Kemble, Weijia Wang |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
viruses
Immunology Orthomyxoviridae Hemagglutinin (influenza) Neuraminidase Chick Embryo medicine.disease_cause Vaccines Attenuated Microbiology Virus Cell Line Dogs Influenza A Virus H1N1 Subtype Virology Vaccines and Antiviral Agents Influenza A virus medicine Animals Humans Attenuated vaccine biology Embryonated biology.organism_classification Hemagglutinins Viral replication Amino Acid Substitution Insect Science biology.protein Mutagenesis Site-Directed |
| Popis: | Several live attenuated influenza virus A/California/7/09 (H1N1) (CA09) candidate vaccine variants that possess the hemagglutinin (HA) and neuraminidase (NA) gene segments from the CA09 virus and six internal protein gene segments from the cold-adapted influenza virus A/Ann Arbor/6/60 (H2N2) virus were generated by reverse genetics. The reassortant viruses replicated relatively poorly in embryonated chicken eggs. To improve virus growth in eggs, reassortants expressing the HA and NA of CA09 were passaged in MDCK cells and variants exhibiting large-plaque morphology were isolated. These variants replicated at levels approximately 10-fold higher than the rate of replication of the parental strains in embryonated chicken eggs. Sequence analysis indicated that single amino acid changes at positions 119, 153, 154, and 186 were responsible for the improved growth properties in MDCK cells and eggs. In addition, the introduction of a mutation at residue 155 that was previously shown to enhance the replication of a 1976 swine influenza virus also significantly improved the replication of the CA09 virus in eggs. Each variant was further evaluated for receptor binding preference, antigenicity, attenuation phenotype, and immunogenicity. Mutations at residues 153, 154, and 155 drastically reduced viral antigenicity, which made these mutants unsuitable as vaccine candidates. However, changes at residues 119 and 186 did not affect virus antigenicity or immunogenicity, justifying their inclusion in live attenuated vaccine candidates to protect against the currently circulating 2009 swine origin H1N1 viruses. |
| Databáze: | OpenAIRE |
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