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HLA-E-dependent presentation of Mtb-derived antigen to human CD8+ T cells
Amy S Heinzel1, Jeff E Grotzke, Rebecca A Lines
1Division of Pulmonary & Critical Care Medicine, Portland VA Medical Center, Oregon Health Sciences University, Portland, OR 97201, USA.
Abstract:
Previous studies in mice and humans have suggested an important role for CD8+ T cells in host defense to Mtb. Recently, we have described human, Mtb-specific CD8+ cells that are neither HLA-A, B, or C nor group 1 CD1 restricted, and have found that these cells comprise the dominant CD8+ T cell response in latently infected individuals. In this report, three independent methods are used to demonstrate the ability of these cells to recognize Mtb-derived antigen in the context of the monomorphic HLA-E molecule. This is the first demonstration of the ability of HLA-E to present pathogen-derived antigen. Further definition of the HLA-E specific response may aid development of an effective vaccine against tuberculosis.