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pubmed-article:10220434pubmed:abstractTextInteractions between alphabeta T cell receptors and peptides bound to molecules encoded by the MHC genes underly T cell activation. More than 1% of T cells are activated by foreign (allogenic) MHC molecules, a phenomenon called alloreactivity. Reconciling the high frequency of alloreactivity with the fact that only 1 T cell in 10(4)-10(6) responds to a given foreign antigen presented on self MHC has been a long-standing puzzle. We show, by using a quantitative model, that this difference follows from the affinity model of T cell selection. Further, we demonstrate that highly alloreactive pre- and post-selection repertoires can be obtained without assuming germline bias of T cell receptors toward recognition of allele-specific MHC residues. It has been proposed that alloreactivity occurs because self and foreign MHCs bind different subsets of self peptides or alter their conformation differently. We find that such effects decrease rather than increase alloreactivity. Overall, our results show that the affinity model of T cell selection can quantitatively explain both self MHC restriction and high alloreactivity.lld:pubmed
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pubmed-article:10220434pubmed:authorpubmed-author:PerelsonA SASlld:pubmed
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pubmed-article:10220434pubmed:pagination5153-8lld:pubmed
pubmed-article:10220434pubmed:dateRevised2008-11-20lld:pubmed
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pubmed-article:10220434pubmed:year1999lld:pubmed
pubmed-article:10220434pubmed:articleTitleExplaining high alloreactivity as a quantitative consequence of affinity-driven thymocyte selection.lld:pubmed
pubmed-article:10220434pubmed:affiliationTheoretical Biology and Biophysics, MS K710, Los Alamos NM 87545, USA.lld:pubmed
pubmed-article:10220434pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10220434pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:10220434pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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