Combined DNA vaccines formulated either in DDA or in saline protect cattle from Mycobacterium bovis infection

文献类型: 外文期刊

第一作者: Cai, H

作者: Cai, H;Tian, X;Hu, XD;Li, SX;Yu, DH;Zhu, YX

作者机构:

关键词: antibodies;antigens;calves;DNA vaccines;experimental infection;IgG;immune response;immunization;interferon;lungs;lymph nodes;vaccination

期刊名称:VACCINE ( 影响因子:3.641; 五年影响因子:3.816 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: We tested the effectiveness of combined DNA vaccines encoding antigens Ag85B, MPT64 and MPT83 from Mycobacterium tuberculosis on cattle. Our results showed that calves treated with combined DNA vaccines in the presence of dimethyldioctyldecyl ammonium bromide (DDA) or saline elicited a strong gamma interferon (IFN-gamma) response 1 or 2 months after the third vaccination. All three antigens induced substantial levels of IFN-gamma production 1 month after the bacterial challenge, when the BCG-driven IFN-gamma levels dropped to less than one third of their peak values. Animals receiving combined DNA vaccines produced highest amounts of IgG antibody titer 2 months after the third vaccination. Steady state low IgG levels were found 2 months after bacterial challenge. A few small lung and lymph node lesions were detected in 1/5 animals treated with combined DNA vaccines, whereas 3/5 of BCG-treated and 5/5 of vector-control calves showed larger and significantly more lesions. About 70- to 100-fold fewer bacteria were found in the lungs and lymph nodes of combined DNA vaccine-treated animals compared to those of the control group. Histopathological analyses showed that vaccinated calves possessed substantially improved post-infection lung and lymph node pathology relative to the controls. Our data indicate that combined DNA vaccines may be used in cattle to combat bovine tuberculosis.

分类号: R194

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