Complete modification of TCR specificity and repertoire selection does not perturb a CD8+ T cell immunodominance hierarchy.Kedzierska, K., Guillonneau, C., Gras, S., Hatton, L.A., Webby, R., Purcell, A.W., Rossjohn, J., Doherty, P.C., Turner, S.J.
(2008) Proc.Natl.Acad.Sci.USA 105: 19408-19413
- PubMed: 19047637
- DOI: 10.1073/pnas.0810274105
- PubMed Abstract:
Understanding T cell immunodominance hierarchies is fundamental to the development of cellular-based vaccines and immunotherapy. A combination of influenza virus infection in C57BL/6J mice and reverse genetics is used here to dissect the role of T ce ...
Understanding T cell immunodominance hierarchies is fundamental to the development of cellular-based vaccines and immunotherapy. A combination of influenza virus infection in C57BL/6J mice and reverse genetics is used here to dissect the role of T cell antigen receptor (TCR) repertoire in the immunodominant D(b)NP(366)CD8(+) T cell response. Infection with an engineered virus (NPM6A) containing a single alanine (A) mutation at the critical p6 NP(366-374) residue induced a noncross-reactive CD8(+) T cell response characterized by a novel, narrower TCR repertoire per individual mouse that was nonetheless equivalent in magnitude to that generated after WT virus challenge. Although of lower overall avidity, the levels of both cytotoxic T lymphocyte activity and cytokine production were comparable with those seen for the native response. Importantly, the overdominance profile characteristic of secondary D(b)NP(366)-specific clonal expansions was retained for the NPM6A mutant. The primary determinants of immunodominance in this endogenous, non-TCR-transgenic model of viral immunity are thus independent of TCR repertoire composition and diversity. These findings both highlight the importance of effective antigen dose for T cell vaccination and/or immunotherapy and demonstrate the feasibility of priming the memory T cell compartment with engineered viruses to protect against commonly selected mutants viral (or tumor) escape mutants.
Department of Microbiology and Immunology, The Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville 3010, Melbourne, Australia. email@example.com