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Impfstoffe für alle? Dodecin als Impfstoffplattform. BIOSPEKTRUM 2021; 27:250-253. [PMID: 33994672 PMCID: PMC8111370 DOI: 10.1007/s12268-021-1564-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Zhao R, Luo T, Ma P, Ge L, Chen Z, Wang X, Liao W, Bao L. Improvement of the immunogenicity of ESAT-6 via fusion with the dodecameric protein dodecin of Mycobacterium tuberculosis. Microb Pathog 2021; 155:104890. [PMID: 33915207 DOI: 10.1016/j.micpath.2021.104890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 03/21/2021] [Accepted: 03/22/2021] [Indexed: 11/30/2022]
Abstract
Tuberculosis (TB) is a chronic infectious disease that creates a heavy medical burden worldwide. The only approved vaccine, Bacillus Calmette-Guérin (BCG), cannot fully protect adolescents and adults from TB. Therefore, there is an urgent need to develop an effective new vaccine. Previous studies have found that dodecin, a flavin-binding protein of Mycobacterium tuberculosis (Mtb), can form stable dodecamers and has the potential to improve the immunogenicity of Mtb antigens. In this study, we constructed the fusion protein dodecin-ESAT-6 and evaluated the immunogenicity of dodecin, ESAT-6, and dodecin-ESAT-6 separately. Our results showed that dodecin-ESAT-6 is a dodecameric protein that can withstand heat at 95 °C and under SDS-PAGE conditions. Dodecin-ESAT-6 increased the expression of the costimulatory molecules CD80, CD86, and major histocompatibility complex class II (MHC-II) on the surface of RAW264.7 macrophages. Mice immunized with dodecin-ESAT-6 exhibited higher percentages of antigen-specific CD4+ and CD8+ T lymphocytes, higher levels of spleen lymphocyte proliferation and IFN-γ and IL-2 secretion, and a lower level of IL-4 secretion than those immunized with ESAT-6. The IgG, IgG1, and IgG2a titers of the dodecin-ESAT-6 group were significantly higher than those of the ESAT-6 group. Dodecin-ESAT-6 elicited a high IgG2a/IgG1 ratio and tended to produce a predominantly Th1-like response. These results support the conclusion that the dodecin-ESAT-6 dodecameric protein induced strong Th1 immune responses and improved the immunogenicity of ESAT-6, which provides a new strategy for TB vaccine development.
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Affiliation(s)
- Rongchuan Zhao
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
| | - Tao Luo
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
| | - Pengjiao Ma
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
| | - Liang Ge
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
| | - Zonghai Chen
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
| | - Xinyan Wang
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
| | - Wei Liao
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
| | - Lang Bao
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
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