title: Ag85B synergizes with ESAT-6 to induce efficient and long-term immunity of C57BL/6 mice primed with recombinantBacille Calmette-Guerin.
abstract: The latest probable scenario in vaccination strategies is to prime one live attenuated vaccine candidate followed by boost dose of second vaccine candidate. In the present study, we primed the mice with a recombinant Bacille Calmette-Guerin (BCG) comprising Ag85B and ESAT-6 followed by boost doses of Ag85B, ESAT-6 and Ag85B-ESAT-6 fusion protein in the DDA adjuvant, separately. After boost doses of 8 and 12 weeks, the levels of antigen-stimulated T cells secreting interferon (IFN)-γ, the content of the IFN-γ, tumor necrosis factor-α and interleukin-4 in the splenocytesin vitroculture supernatant, the antigen-specific immunoglobulin (Ig)G titer from mouse serum, IgG subclass and the population of antigen-specific CD4+and CD8+T cells were detected. The present study showed that recombinant BCG along with boost doses of Ag85B or ESAT-6 individually did not induce efficient T-helper (Th) 1-type immune response. On the other hand, recombinant BCG with boost doses of Ag85B-ESAT-6 fusion protein enhanced longer lasting predominant Th1 immune response. This result suggested that Ag85B might synergize with ESAT-6 protein in order to produce better as well as effective immune response. Thus, the present study concluded recombinant BCG with boost doses of Ag85B-ESAT-6 fusion protein could be a good strategy to improve the immune protective efficacy.
authors.affiliation: State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, P.R. China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, P.R. China.
authors.forename: Jingran
authors.initials: J
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, P.R. China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, P.R. China.
authors.forename: Enzhuo
authors.initials: E
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, P.R. China.
authors.forename: Honghai
authors.initials: H
authors.lastname: Wang
keywords: mycobacterium tuberculosis; prime-boost; recombinant Bacille Calmette-Guerin; vaccine