Ly49Q ligand expressed by activated B cells induces plasmacytoid DC maturation.

Abstract:

:Ly49Q, a type II C-type lectin expressed on mouse plasmacytoid DC (pDC), contains a single carbohydrate recognition domain in its extracellular region and an ITIM in its cytoplasmic domain. We have identified the MHC class I molecule H-2K(b) as a Ly49Q ligand, confirming prior reports. Although H-2K(b) is expressed on essentially all hematopoietic cells, we found that only CpG-stimulated B cells were able to activate Ly49Q. This discovery correlated with our finding that although H-2K(b) forms clusters on CpG-activated B cells, it is diffusely expressed on resting B cells. Furthermore, CpG-stimulated, but not resting, B cells up-regulated co-stimulatory molecules on pDC. This finding was confirmed by the fact that binding by anti-Ly49Q mAb to Ly49Q led to pDC maturation in vitro. Our results suggest that clustered H-2K(b) on activated B cells act as ligands for Ly49Q and induce pDC maturation in vitro.

journal_name

Eur J Immunol

authors

Toma-Hirano M,Namiki S,Shibata Y,Ishida K,Arase H,Miyatake S,Arai K,Kamogawa-Schifter Y

doi

10.1002/eji.200838363

subject

Has Abstract

pub_date

2009-05-01 00:00:00

pages

1344-52

issue

5

eissn

0014-2980

issn

1521-4141

journal_volume

39

pub_type

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