The VP1 G-H loop hypervariable epitope contributes to protective immunity against Foot and Mouth Disease Virus in swine
| Autor: | Elizabeth Ramirez-Medina, Lawrence K. Silbart, Teresa de los Santos, Ignacio Fernandez-Sainz, Steven M. Szczepanek, Ping Wu, Yelitza Y. Rodriguez, Tyler D Gavitt, Marla Koster |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Swine
Adenoviridae Infections viruses Genetic Vectors 030231 tropical medicine Viremia Antibodies Viral Virus Epitope Adenoviridae Cell Line Epitopes 03 medical and health sciences 0302 clinical medicine medicine Animals Humans 030212 general & internal medicine Neutralizing antibody General Veterinary General Immunology and Microbiology biology Immunogenicity Vaccination Public Health Environmental and Occupational Health Viral Vaccines biochemical phenomena metabolism and nutrition biology.organism_classification medicine.disease Antibodies Neutralizing Virology Hypervariable region HEK293 Cells Infectious Diseases Foot-and-Mouth Disease Virus Foot-and-Mouth Disease biology.protein Molecular Medicine Capsid Proteins Immunization Foot-and-mouth disease virus |
| Zdroj: | Vaccine. 37:3435-3442 |
| ISSN: | 0264-410X |
| DOI: | 10.1016/j.vaccine.2019.05.019 |
| Popis: | Foot and Mouth Disease is a highly contagious and economically important disease of livestock. While vaccination is often effective at controlling viral spread, failures can occur due to strain mismatch or viral mutation. Foot and Mouth Disease Virus (FMDV) possesses a hypervariable region within the G-H Loop of VP1, a capsid protein commonly associated with virus neutralization. Here, we investigate the effect of replacement of the G-H loop hypervariable epitope with a xenoepitope from PRRS virus on the immunogenicity and efficacy of an adenovirus vectored FMDV vaccine (Ad5-FMD). Pigs were vaccinated with Ad5-FMD, the modified Ad5-FMDxeno, or PBS, followed by intradermal challenge with FDMV strain O1 Manisa at 21 days post-vaccination. While overall serum antibody titers were significantly higher in Ad5-FMDxeno vaccinated animals, neutralizing antibody titers were decreased in pigs that received Ad5-FMDxeno, when compared to those vaccinated with Ad5-FMD, prior to viral challenge, indicative of immune redirection away from VP1 towards non-neutralizing epitopes. As expected, animals vaccinated with unmodified Ad5-FMD were protected from lesions, fever, and viremia. In contrast, animals vaccinated with Ad5-FMDxeno developed clinical signs and viremia, but at lower levels than that observed in PBS-treated controls. No significant difference was found in nasal shedding of virions between the two Ad5-FMD vaccinated groups. This data suggests that the hypervariable epitope of the VP1 G-H loop contributes to protective immunity conferred by Ad5 vector-delivered FMD vaccines in swine, and cannot be substituted without a loss of immunogenicity. |
| Databáze: | OpenAIRE |
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