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International Immunology Advance Access published online on August 16, 2007
International Immunology, doi:10.1093/intimm/dxm071
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© The Japanese Society for Immunology. 2007. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Mouse leukocyte-associated Ig-like receptor-1 (mLAIR-1) functions as an inhibitory collagen-binding receptor on immune cells

Robert Jan Lebbink1, Talitha de Ruiter1, Guido J. A. Kaptijn1, Dominique G. Bihan2, Christine A. Jansen1, Peter J. Lenting3 and Linde Meyaard1

1 Department of Immunology, University Medical Center Utrecht, Lundlaan 6, 3584 EA Utrecht, The Netherlands
2 Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, UK
3 Thrombosis and Haemostasis Laboratory, Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands

Correspondence to: Correspondence to: L. Meyaard; E-mail: l.meyaard{at}umcutrecht.nl

Leukocyte-associated Ig-like receptor-1 (LAIR-1) is a cell-surface molecule that functions as an inhibitory receptor on various immune cells. We developed mAbs to study the expression of mouse leukocyte-associated Ig-like receptor-1 (mLAIR-1) on primary immune cells and established that it is expressed on the majority of cells of the immune system, including T cells, NK cells, monocytes and dendritic cells. Furthermore, mLAIR-1 is inducibly expressed on blood granulocytes in vivo and is differentially expressed upon T cell activation in vitro. Unexpectedly, mLAIR-1 was not expressed on splenic and blood B220+ B cells. Similar to its human homolog, mLAIR-1 interacted with high affinity with a wide range of collagen molecules. Furthermore, mLAIR-1 specifically interacted in a hydroxyproline-dependent manner with synthetic collagen Gly-Pro-Hyp peptides. We show, for the first time, that mLAIR-1 cross-linking with its ligands inhibits CD3-induced T cell stimulation in vitro. Given the similarities between the mouse and human receptors, mLAIR-1 may serve as a good model to assess the role of the LAIR-1 receptors in regulation of immune responses.

Keywords: CD305, immune receptor, ITIM, regulation

Transmitting editor: I. Pecht

Received 29 September 2006, accepted 30 May 2007.


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