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

Hur, YG | Chung, WY  | Kim, A | Kim, YS  | Kim, HS | Jang, SH | Kim, Y | Lee, H | Park, KJ  | Cho, SN
The Journal of infection, 73(1). : 54-62, 2016
Journal Title
The Journal of infection
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.

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
김, 영선  |  박, 광주  |  정, 우영
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