Format

Send to

Choose Destination
Nat Immunol. 2008 Mar;9(3):282-91. doi: 10.1038/ni1559. Epub 2008 Jan 20.

T cell sensing of antigen dose governs interactive behavior with dendritic cells and sets a threshold for T cell activation.

Author information

1
Department of Pathology and the Immune Disease Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.

Abstract

After homing to lymph nodes, CD8+ T cells are primed by dendritic cells (DCs) in three phases. During phase one, T cells undergo brief serial contacts with DCs for several hours, whereas phase two is characterized by stable T cell-DC interactions. We show here that the duration of phase one and T cell activation kinetics correlated inversely with the number of complexes of cognate peptide and major histocompatibility complex (pMHC) per DC and with the density of antigen-presenting DCs per lymph node. Very few pMHC complexes were necessary for the induction of full-fledged T cell activation and effector differentiation. However, neither T cell activation nor transition to phase two occurred below a threshold antigen dose determined in part by pMHC stability. Thus, phase one permits T cells to make integrated 'measurements' of antigen dose that determine subsequent T cell participation in immune responses.

Comment in

PMID:
18204450
PMCID:
PMC2698867
DOI:
10.1038/ni1559
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center