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. 1994 Oct 3;13(19):4482–4489. doi: 10.1002/j.1460-2075.1994.tb06770.x

Role of coreceptors in positive selection and lineage commitment.

S H Chan 1, C Waltzinger 1, A Baron 1, C Benoist 1, D Mathis 1
PMCID: PMC395380  PMID: 7925290

Abstract

Recent experiments have re-awakened interest in a stochastic/selective model of positive selection of T lymphocytes. A revised version of the model has been proposed whereby commitment of double-positive thymocytes to either the CD4 or CD8 lineage requires two engagements with MHC molecules: the first, initiating the differentiation program, signals down-regulation of one or the other coreceptor, regardless of the T cell receptor's specificity for MHC class I or II molecules; the second, leading to terminal differentiation, screens the choice of coreceptor by permitting only those cells with matched receptors and coreceptors to proceed. Here we explore the role of coreceptors in the two stages of positive selection by manipulating CD8 expression in MHC class II-deficient mice, crossing them with either CD8-negative animals or animals carrying combinations of CD8 alpha and CD8 beta transgenes. We find that coreceptors are required at both stages of positive selection and that artificial expression of the down-modulated CD8 molecule can quite efficiently rescue cells that have made a 'mistake' in their choice of coreceptor. We also establish that commitment to the CD4 pathway and to the helper phenotype can be linked.

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Selected References

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