Identification of an HLA-A*0201-restricted T-cell epitope on the MPT51 protein, a major secreted protein derived from Mycobacterium tuberculosis, by MPT51 overlapping peptide screening.

Infection and Immunity
Taiki AoshiYukio Koide

Abstract

CD8+ T cells play a pivotal role in protection against Mycobacterium tuberculosis infection. We identified a novel HLA-A*0201-restricted CD8+ T-cell epitope on a dominant secreted antigen of M. tuberculosis, MPT51, in HLA-A*0201 transgenic HHD mice. HHD mice were immunized with plasmid DNA encoding MPT51 with gene gun bombardment, and gamma interferon (IFN-gamma) production by the immune splenocytes was analyzed. In response to overlapping synthetic peptides covering the mature MPT51 sequence, the splenocytes were stimulated to produce IFN-gamma by only one peptide, p51-70. Three-color flow cytometric analysis of intracellular IFN-gamma and cell surface CD4 and CD8 staining revealed that the MPT51 p51-70 peptide contains an immunodominant CD8+ T-cell epitope. Further analysis using computer algorithms permitted identification of a bona fide T-cell epitope, p53-62. A major histocompatibility complex class I stabilization assay using T2 cells confirmed that this epitope binds to HLA-A*0201. The T cells were capable of lysing MPT51 p53-62 peptide-pulsed T2 cells. In addition, MPT51 p53-62-specific memory CD8+ T cells were found in tuberculin skin test-positive HLA-A*0201+ healthy individuals. Use of this HLA-A*0201-restricted CD8+...Continue Reading

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Citations

May 29, 2010·Journal of Biomedicine & Biotechnology·Toshi Nagata, Yukio Koide
May 28, 2010·Nihon saikingaku zasshi. Japanese journal of bacteriology·Toshi Nagata, Yukio Koide
Jul 28, 2011·Vaccine·Abolfazl JahangiriSaeed Khalili
Aug 4, 2009·Current Opinion in Immunology·Andrea M Cooper
Jun 9, 2009·Vaccine·Bruna Daniella de Souza SilvaAna Paula Junqueira-Kipnis

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