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Tsukamoto Y, Maeda Y, Tamura T, Mukai T, Mitarai S, Yamamoto S, Makino M. Enhanced protective efficacy against tuberculosis provided by a recombinant urease deficient BCG expressing heat shock protein 70-major membrane protein-II having PEST sequence. Vaccine 2016; 34:6301-6308. [PMID: 27847173 DOI: 10.1016/j.vaccine.2016.10.069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 09/14/2016] [Accepted: 10/22/2016] [Indexed: 11/26/2022]
Abstract
Enhancement of the T cell-stimulating ability of Mycobacterium bovis BCG (BCG) is necessary to develop an effective tuberculosis vaccine. For this purpose, we introduced the PEST-HSP70-major membrane protein-II (MMPII)-PEST fusion gene into ureC-gene depleted recombinant (r) BCG to produce BCG-PEST. The PEST sequence is involved in the proteasomal processing of antigens. BCG-PEST secreted the PEST-HSP70-MMPII-PEST fusion protein and more efficiently activated human monocyte-derived dendritic cells (DCs) in terms of phenotypic changes and cytokine productions than an empty-vector-introduced BCG or HSP70-MMPII gene-introduced ureC gene-depleted BCG (BCG-DHTM). Autologous human naïve CD8+ T cells and naïve CD4+ T cells were effectively activated by BCG-PEST and produced IFN-γ in an antigen-specific manner through DCs. These T cell activations were closely associated with phagosomal maturation and intraproteasomal protein degradation in antigen-presenting cells. Furthermore, BCG-PEST produced long-lasting memory-type T cells in C57BL/6 mice more efficiently than control rBCGs. Moreover, a single subcutaneous injection of BCG-PEST more effectively reduced the multiplication of subsequent aerosol-challenged Mycobacterium tuberculosis of the standard H37Rv strain and clinically isolated Beijing strain in the lungs than control rBCGs. The vaccination effect of BCG-PEST lasted for at least 6months. These results indicate that BCG-PEST may be able to efficiently control the spread of tuberculosis in human.
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Affiliation(s)
- Yumiko Tsukamoto
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, 4-2-1 Aobacho, Higashimurayama, Tokyo, Japan.
| | - Yumi Maeda
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, 4-2-1 Aobacho, Higashimurayama, Tokyo, Japan
| | - Toshiki Tamura
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, 4-2-1 Aobacho, Higashimurayama, Tokyo, Japan
| | - Tetsu Mukai
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, 4-2-1 Aobacho, Higashimurayama, Tokyo, Japan
| | - Satoshi Mitarai
- Department of Mycobacterium Reference and Research, The Research Institute of Tuberculosis, Japan Anti-Tuberculosis Association, 3-1-24 Matsuyama, Kiyose, Tokyo, Japan
| | | | - Masahiko Makino
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, 4-2-1 Aobacho, Higashimurayama, Tokyo, Japan
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