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Silva BCMD, Grassi MFR, Coutinho R, Mascarenhas REM, Olavarria VN, Coutinho-Borgo A, Kalil J, Cunha Neto E, Fonseca SG. Mycobacterium tuberculosis epitope-specific interferon-g production in healthy Brazilians reactive and non-reactive to tuberculin skin test. Mem Inst Oswaldo Cruz 2014; 109:999-1004. [PMID: 25494469 PMCID: PMC4325617 DOI: 10.1590/0074-0276140193] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 12/11/2014] [Indexed: 12/27/2022] Open
Abstract
The interferon (IFN)-γ response to peptides can be a useful diagnostic marker of
Mycobacterium tuberculosis (MTB) latent infection. We identified promiscuous and
potentially protective CD4+ T-cell epitopes from the most conserved
regions of MTB antigenic proteins by scanning the MTB antigenic proteins GroEL2,
phosphate-binding protein 1 precursor and 19 kDa antigen with the TEPITOPE algorithm.
Seven peptide sequences predicted to bind to multiple human leukocyte antigen
(HLA)-DR molecules were synthesised and tested with IFN-γ enzyme-linked immunospot
(ELISPOT) assays using peripheral blood mononuclear cells (PBMCs) from 16 Mantoux
tuberculin skin test (TST)-positive and 16 TST-negative healthy donors. Eighty-eight
percent of TST-positive donors responded to at least one of the peptides, compared to
25% of TST-negative donors. Each individual peptide induced IFN-γ production by PBMCs
from at least 31% of the TST-positive donors. The magnitude of the response against
all peptides was 182 ± 230 x 106 IFN-γ spot forming cells (SFC) among
TST-positive donors and 36 ± 62 x 106 SFC among TST-negative donors (p =
0.007). The response to GroEL2 (463-477) was only observed in the TST-positive group.
This combination of novel MTB CD4 T-cell epitopes should be tested in a larger cohort
of individuals with latent tuberculosis (TB) to evaluate its potential to diagnose
latent TB and it may be included in ELISPOT-based IFN-γ assays to identify
individuals with this condition.
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Affiliation(s)
| | | | - Raimundo Coutinho
- Laboratório Avançado de Saúde Pública, Fundação Oswaldo Cruz, Salvador, BA, Brasil
| | | | | | | | - Jorge Kalil
- Laboratório de Imunologia, Instituto do Coração, São Paulo, SP, Brasil
| | - Edecio Cunha Neto
- Laboratório de Imunologia, Instituto do Coração, São Paulo, SP, Brasil
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Jiang C. Translational medicine in China I: perspectives from Chinese physicians and scientists. SCIENCE CHINA-LIFE SCIENCES 2012; 54:1071-3. [PMID: 22227895 PMCID: PMC7099172 DOI: 10.1007/s11427-011-4260-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/20/2011] [Indexed: 12/11/2022]
Affiliation(s)
- ChengYu Jiang
- Department of Biochemistry and Molecular Biology, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, 100005 China
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