title: High level of IFN-γ released from whole blood of human tuberculosis infections following stimulation with Rv2073c of Mycobacterium tuberculosis.
abstract: More efficacious and specific biomarkers are urgently needed for better control of tuberculosis (TB), the second leading infectious cause of mortality worldwide. The region of difference 9 (RD9) presents the genome of the causative pathogen Mycobacterium tuberculosis rather than other species of the genus Mycobacterium, which might be promising targets for specific diagnosis, vaccine development and pathogenesis. In this study, two proteins Rv2073c and Rv2074, encoded by the RD9 were expressed and purified from Escherichia coli system. Following stimulation with both proteins, the levels of IFN-γ secreted by T cells from a total of 49 whole blood samples obtained from clinically diagnosed active TB patients, patients with latent TB infections (LTBIs), and healthy donors, were compared with those of the incubation with recombinant fusion protein of CFP21 and MPT64 (rCM). Our results demonstrated that only Rv2073c could induce a higher level of IFN-γ in TB infections than healthy controls and there was a positive correlation between Rv2073c- and rCM-specific IFN-γ levels in TB infections and healthy donors, respectively. These findings indicate that Rv2073c might be a promising antigen for specific diagnostic reagents and vaccine candidates of TB.
authors.affiliation: Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China.
authors.forename: Kun
authors.initials: K
authors.lastname: Tan
authors.affiliation: Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China.
authors.forename: Jingyan
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China.
authors.forename: Xindong
authors.initials: X
authors.lastname: Teng
authors.affiliation: Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China.
authors.forename: Jinping
authors.initials: J
authors.lastname: Liang
authors.affiliation: Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China.
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Yuan
authors.affiliation: Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China.
authors.forename: Maopeng
authors.initials: M
authors.lastname: Tian
authors.affiliation: Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China. Electronic address: xlfan@hust.edu.cn.
authors.forename: Xionglin
authors.initials: X
authors.lastname: Fan
mesh_terms: D000942:Antigens, Bacterial / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D001426:Bacterial Proteins / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification; D001769:Blood / Q000276:immunology*; D002478:Cells, Cultured; D004926:Escherichia coli / Q000235:genetics; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism*; D009169:Mycobacterium tuberculosis / Q000235:genetics / Q000276:immunology*; D011994:Recombinant Proteins / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification; D014376:Tuberculosis / Q000175:diagnosis* / Q000276:immunology
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D011994:Recombinant Proteins; D007371:Interferon-gamma
keywords: CFP21; MPT64; Mycobacterium tuberculosis; Region of difference 9; Rv2073c; Whole blood IFN-γ assay