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Proc Natl Acad Sci U S A. 2012 Jul 31;109(31):12716-21. doi: 10.1073/pnas.1203468109. Epub 2012 Jul 16.

Cross-dressed CD8α+/CD103+ dendritic cells prime CD8+ T cells following vaccination.

Author information

1
Department of Surgery, Washington University School of Medicine, St Louis, MO 63110, USA.

Abstract

Activation of naïve cluster of differentiation (CD)8(+) cytotoxic T lymphocytes (CTLs) is a tightly regulated process, and specific dendritic cell (DC) subsets are typically required to activate naive CTLs. Potential pathways for antigen presentation leading to CD8(+) T-cell priming include direct presentation, cross-presentation, and cross-dressing. To distinguish between these pathways, we designed single-chain trimer (SCT) peptide-MHC class I complexes that can be recognized as intact molecules but cannot deliver antigen to MHC through conventional antigen processing. We demonstrate that cross-dressing is a robust pathway of antigen presentation following vaccination, capable of efficiently activating both naïve and memory CD8(+) T cells and requires CD8α(+)/CD103(+) DCs. Significantly, immune responses induced exclusively by cross-dressing were as strong as those induced exclusively through cross-presentation. Thus, cross-dressing is an important pathway of antigen presentation, with important implications for the study of CD8(+) T-cell responses to viral infection, tumors, and vaccines.

PMID:
22802630
PMCID:
PMC3411977
DOI:
10.1073/pnas.1203468109
[Indexed for MEDLINE]
Free PMC Article

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