title: Identification of HLA-DR4-restricted T-cell epitope on MPT51 protein, a major secreted protein derived from Mycobacterium tuberculosis using MPT51 overlapping peptides screening and DNA vaccination.
abstract: We identified a novel HLA-DR4-restricted CD4+ T-cell epitope on a secreted antigen of Mycobacterium tuberculosis, MPT51, in 004149-MM HLA-DR4-transgenic mice which express HLA-DRB1*0401, but not murine MHC class II molecules. The mice were immunized with plasmid DNA encoding MPT51 using gene gun and interferon (IFN)-gamma production from the immune splenocytes was analyzed. In response to overlapping synthetic peptides covering the mature MPT51 sequence, only one peptide, p191-210, stimulated the splenocytes to produce IFN-gamma. Further analysis using flow cytometry and computer-assisted algorithm, ProPred, narrowed down the region of CD4+ T-cell epitope to p191-202. The CD4+ T-cell epitope would be feasible for vaccine design against tuberculosis as well as for analysis of MPT51-specific T-cells in M. tuberculosis infection.
authors.affiliation: Department of Infectious Diseases, Hamamatsu University School of Medicine, 1-20-1 Higashi-ku, Handa-yama, Hamamatsu 431-3192, Japan.
authors.forename: Li-Xin
authors.initials: LX
authors.lastname: Wang
authors.forename: Toshi
authors.initials: T
authors.lastname: Nagata
authors.forename: Kunio
authors.initials: K
authors.lastname: Tsujimura
authors.forename: Masato
authors.initials: M
authors.lastname: Uchijima
authors.forename: Shintaro
authors.initials: S
authors.lastname: Seto
authors.forename: Yukio
authors.initials: Y
authors.lastname: Koide
mesh_terms: D000465:Algorithms; D000595:Amino Acid Sequence; D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology*; D001426:Bacterial Proteins / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D002478:Cells, Cultured; D018984:Epitopes, T-Lymphocyte / Q000276:immunology*; D005260:Female; D006684:HLA-DR Antigens / Q000276:immunology*; D059811:HLA-DRB1 Chains; D007371:Interferon-gamma; D051379:Mice; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D010957:Plasmids; D013154:Spleen / Q000166:cytology / Q000276:immunology; D032581:Tuberculosis Vaccines / Q000276:immunology; D019444:Vaccines, DNA / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D018984:Epitopes, T-Lymphocyte; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; C553505:HLA-DRB1*04:01 antigen; C082911:MPT51 protein, Mycobacterium; D032581:Tuberculosis Vaccines; D019444:Vaccines, DNA; D007371:Interferon-gamma