Enhancement of protective immune responses by oral vaccination with Saccharomyces cerevisiae expressing recombinant Actinobacillus pleuropneumoniae ApxIA or ApxIIA in mice
Journal of Veterinary Science
; : 383-392, 2007.
Article
em En
| WPRIM
| ID: wpr-210998
Biblioteca responsável:
WPRO
ABSTRACT
We previously induced protective immune response by oral immunization with yeast expressing the ApxIIA antigen. The ApxI antigen is also an important factor in the protection against Actinobacillus pleuropneumoniae serotype 5 infection; therefore, the protective immunity in mice following oral immunization with Saccharomyces cerevisiae expressing either ApxIA (group C) or ApxIIA (group D) alone or both (group E) was compared with that in two control groups (group A and B). The immunogenicity of the rApxIA antigen derived from the yeast was confirmed by a high survival rate and an ApxIA-specific IgG antibody response (p < 0.01). The highest systemic (IgG) and local (IgA) humoral immune responses to ApxIA and ApxIIA were detected in group E after the third immunization (p < 0.05). The levels of IL-1beta and IL-6 after challenge with an A. pleuropneumoniae field isolate did not change significantly in the vaccinated groups. The level of TNF-alpha increased in a time-dependent manner in group E but was not significantly different after the challenge. After the challenge, the mice in group E had a significantly lower infectious burden and a higher level of protection than the mice in the other groups (p < 0.05). The survival rate in each group was closely correlated to the immune response and histopathological observations in the lung following the challenge. These results suggested that immunity to the ApxIA antigen is required for optimal protection.
Palavras-chave
Texto completo:
1
Índice:
WPRIM
Assunto principal:
Saccharomyces cerevisiae
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Fatores de Tempo
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Proteínas de Bactérias
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Infecções por Actinobacillus
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Proteínas Recombinantes
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Imunoglobulina A
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Vacinas Sintéticas
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Análise de Sobrevida
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Citocinas
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Vacinação
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Journal of Veterinary Science
Ano de publicação:
2007
Tipo de documento:
Article