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pubmed-article:7836933pubmed:abstractTextT cells potentially encounter numerous endogenous peptides during selection in the thymus and in the periphery. We examined the impact of an endogenous peptide on in vivo T cell development, using a TCR transgenic mouse model based on a hemoglobin-specific T cell clone. In these mice, the transgenic beta chains paired with endogenous alpha chains. This led to a serendipitous primary reactivity to Ser69 peptide, an altered peptide ligand of the Hbd (64-76) epitope of the parent clone. Two Ser69-reactive T cell populations were identified. A smaller population of the Ser69-reactive T cells responded both to Ser69 and Hbd (64-76). A majority reacted only to Ser69, and not to Hbd(64-76); in fact, Hbd(64-76) was a specific TCR antagonist for these Ser69-only-reactive T cells. Thus, in this unique experimental system, Ser69 became an agonist, and Hbd (64-76) was an antagonist. Endogenous presentation of the antagonist ligand in the thymus selectively eliminated the high-avidity cells, while sparing low-avidity cells in the Ser69-reactive T cell repertoire. These results highlight how specificity guides developing T cells through a network of ligands and indicate that the endogenous peptide pool has a profound effect on T cell development and repertoire.lld:pubmed
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pubmed-article:7836933pubmed:articleTitleModulation of T cell development by an endogenous altered peptide ligand.lld:pubmed
pubmed-article:7836933pubmed:affiliationCenter for Immunology, Washington University School of Medicine, St. Louis, Missouri 63110.lld:pubmed
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pubmed-article:7836933pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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