Identification of an HLA-A*0201-restricted CD8(+) T-cell epitope encoded within Leptospiral immunoglobulin-like protein A

Microbes and Infection
Ying-Jun GuoShu-Han Sun

Abstract

Leptospirosis is an important zoonosis in humans. Immunity against leptospiral infection was thought to be primarily humoral, and limited studies have addressed the role of CD8(+)T cells. Leptospiral immunoglobulin-like protein A (LigA) is an important protective antigen of Leptospira and a potential target for Leptospira-specific cell-mediated immunity. In this study, twenty LigA-derived peptides were tested their binding affinity and stability for the HLA-A*0201 molecule. Peptides with high binding affinity and stability for HLA-A*0201 were then assessed their capacity to elicit specific cytotoxic T-lymphocyte (CTL) responses using cytotoxicity, ELISPOT assays for IFN-gamma and HLA-A*0201-peptide tetramer assays. We identified a HLA-A*0201-restricted epitope, LigA(305-313) KLIVTPAAL in Leptospira LigA. CTLs specific for LigA(305-313) were elicited both in HLA-A2.1/K(b) transgenic mice and in patients with a clinical and/or laboratory diagnosis of leptospirosis. Staining of the HLA-A*0201-LigA(305-313) tetramer revealed the presence of LigA(305-313)-specific CTLs in peripheral blood mononuclear cells (PBMCs) sourced from five patients infected with three different serovars of Leptospira. In conclusion, we report the existence ...Continue Reading

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Citations

Oct 29, 2013·Microbiology·Luis G V FernandesAna L T O Nascimento
Jan 15, 2014·Innate Immunity·Meenakshi RaniMartin G Schwacha

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