Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 21, Pages 8647-8652Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0811584106
Keywords
immunodominance; competition; T cell activation; MHC; peptide
Categories
Funding
- National Institutes of Health [R01-AI051542, T32-AI0785]
- Health and Human Services [HHSN266200700008C]
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Immunodominance refers to the highly selective peptide reactivity of T cells during an immune response. In this study, we tested the hypothesis that persistence of peptide: class II complexes is one key parameter that selects the final specificity of CD4 T cells. We found that low-stability peptide: class II complexes support the initial priming and expansion of CD4 T cells, but the expansion becomes strikingly aborted in the presence of competitive T cell responses to unrelated peptides. Our experiments revealed that for inhibition to occur, the competitive responses must be initiated by the same antigen presenting cell, and it is not because of competition for MHC binding. These studies not only provide an insight into the events that regulate competitive CD4 T cell priming in vivo, but also provide a previously undescribed conceptual framework to understand the parameters that select the final specificity of the T cell repertoire during pathogen or vaccine-induced immune responses.
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