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Host immune responses to antigens derived from a predominant strain of Mycobacterium tuberculosis

Authors
Hur, YG; Chung, WY; Kim, A; Kim, YS; Kim, HS; Jang, SH; Kim, Y; Lee, H; Park, KJ; Cho, SN
Citation
The Journal of infection, 73(1):54-62, 2016
Journal Title
The Journal of infection
ISSN
0163-44531532-2742
Abstract
OBJECTIVES: Beijing strain of Mycobacterium tuberculosis (M. tb) is characterized by a high incidence of transmission, relapse, and drug resistance. This study aimed to determine host immune responses to antigens derived from the Beijing/K strain which has been highly prevalent in tuberculosis (TB) outbreaks in South Korea. METHODS: We recruited 52 TB patients and 96 healthy subjects comprising 31 individuals with latent TB infection (LTBI) and 65 TB-naive controls based on QuantiFERON-TB Gold In-Tube (QFT-IT) tests. Blood samples were obtained for diluted whole-blood assays, multiplex bead arrays, ELISpot assays, and HLA typing. Molecular genotyping of M. tb was performed using clinical isolates. RESULTS: Active TB and LTBI groups were differentiated by TNF-alpha concentrations induced by the Beijing/K strain-derived antigens, MTBK_24790 and MTBK_24800 (P < 0.001). MTBK_24800-induced IFN-gamma and CXCL10 concentrations discriminated the TB-infected groups from TB-naive controls (P < 0.001). IFN-gamma-producing T cells were generated in 87.2% of TB patients in response to MTBK_24800 peptide antigens. The major immunogenic epitope was at C-terminal of the antigen, and predominantly recognized by HLA-DR4 and -DQ4. CONCLUSIONS: Measurement of IFN-gamma, CXCL10, and TNF-alpha concentrations induced by MTBK_24790 and MTBK_24800 may contribute to improved diagnosis of TB and vaccine development in regions where the Beijing/K strain is endemic.
MeSH terms
AdolescentAdultAgedAged, 80 and overAntigens, Bacterial/immunology*Cytokines/analysisDisease OutbreaksEpitopes, T-Lymphocyte/immunologyFemaleHumansMaleMiddle AgedMycobacterium tuberculosis/immunology*Republic of Korea/epidemiologyTuberculosis/diagnosisTuberculosis/epidemiologyTuberculosis/microbiology*Young Adult
DOI
10.1016/j.jinf.2016.04.032
PMID
27155519
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Pulmonary & Critical Care Medicine
Journal Papers > Research Organization > Institute for Medical Sciences
AJOU Authors
정, 우영김, 영선박, 광주
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