[Immunization efficacy and safety of Brucella 104M against aerosol challenge in BALB/c mice].
Zhonghua Liu Xing Bing Xue Za Zhi
; 41(7): 1103-1109, 2020 Jul 10.
Article
em Zh
| MEDLINE
| ID: mdl-32741179
ABSTRACT
Objective:
To evaluate the protective efficacy and safety of Brucella 104M against aerosol challenge in BALB/c mice and characterize its immunological effects.Methods:
Female mice of 6-8 weeks old were immunized with Brucella abortus strain 104M by intratracheal aerosol delivery or intranasal instillation or subcutaneous injection route. Six mice of each group were sacrificed at 4, 8, 16, 24 weeks after immunization. At each time point, the clinical manifestations of mice were investigated, the serum, spleen and lung samples of mice were collected, body weight, spleen weight, bacteria loads in spleens, the anti-Brucella antibodies titers in serum and the cytokines concentrations of IFN-γ, IL-18 in serum or lung homogenate of the mice were detected. Twenty two weeks after immunization, all the mice were challenged with Brucella A19 through intratracheal aerosol delivery.Results:
Compared with the control group, neither abnormal clinical symptoms nor significant changes in body weight were found in 104M immunization groups, at each time point when immunized through either nose dropping route, subcutaneous injection or aerosol routes; and the spleen weight of immunization groups were lower than control group after challenge (P<0.05) *M1 (0.26±0.16)gConclusions:
Intratracheal aerosol delivery is a safe and effective immunization route in BALB/c mice. Both humoral immunity and cellular immunity were stimulated by Brucella 104M, showing obvious protective efficacy against aerosol challenge in BALB/c mice. No significant weight loss was detected. However, the colonizing of Brucella 104M in the spleen of mice was too long (20 weeks), and slighter spleen swelling of the mice were detected, which illustrated that the attenuated strain 104M has residual virulence as a vaccine strain in mice.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Brucella abortus
/
Brucelose
/
Imunização
/
Anticorpos Antibacterianos
Limite:
Animals
Idioma:
Zh
Revista:
Zhonghua Liu Xing Bing Xue Za Zhi
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
China