The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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© The Rockefeller University Press, 0022-1007/1997/5/1743/ $5.00
The Journal of Experimental Medicine, Volume 185, Number 10, May 19, 1997 1743-1751


Articles

A Novel Inhibitory Receptor (ILT3) Expressed on Monocytes, Macrophages, and Dendritic Cells Involved in Antigen Processing

Marina Cella*, Christian Döhring*, Jacqueline Samaridis*, Mark Dessing*, Manfred Brockhaus{ddagger}, Antonio Lanzavecchia*, and Marco Colonna*

From the * Basel Institute for Immunology, CH-4005 Basel, Switzerland; and {ddagger} Hoffmann-La Roche AG, CH-4002 Basel, Switzerland

Immunoglobulin-like transcript (ILT) 3 is a novel cell surface molecule of the immunoglobulin superfamily, which is selectively expressed by myeloid antigen presenting cells (APCs) such as monocytes, macrophages, and dendritic cells. The cytoplasmic region of ILT3 contains putative immunoreceptor tyrosine-based inhibitory motifs that suggest an inhibitory function of ILT3. Indeed, co-ligation of ILT3 to stimulatory receptors expressed by APCs results in a dramatic blunting of the increased [Ca2+]i and tyrosine phosphorylation triggered by these receptors. Signal extinction involves SH2-containing protein tyrosine phosphatase 1, which is recruited by ILT3 upon cross-linking. ILT3 can also function in antigen capture and presentation. It is efficiently internalized upon cross-linking, and delivers its ligand to an intracellular compartment where it is processed and presented to T cells. Thus, ILT3 is a novel inhibitory receptor that can negatively regulate activation of APCs and can be used by APCs for antigen uptake.


Address correspondence to Marco Colonna, Basel Institute for Immunology, 487 Grenzacherstrasse, CH4005 Basel, Switzerland.

The Basel Institute for Immunology was founded and is supported by F. Hoffmann-La Roche Ltd., Basel, Switzerland.

1Abbreviations used in this paper: BCR, B cell antigen receptor; DC, dendritic cells; gp, glycoprotein; HRP, horseradish peroxidase; Ig-SF, Ig superfamily; ILT, Ig-like transcript; ILT3-HuIgG1, ILT3 human IgG1 fusion protein; ITAM, immunoreceptor tyrosine-based activation motif; ITIM, immunoreceptor tyrosine-based inhibitory motif; KIR, killer cell inhibitory receptor; M-CSF, macrophage CSF; MFI, median fluorescence intensity.


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