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Plasmacytoid dendritic cell–specific receptor ILT7–FcεRIγ inhibits Toll-like receptor–induced interferon production
- Source :
- Journal of Experimental Medicine. 203:1399-1405
- Publication Year :
- 2006
- Publisher :
- Rockefeller University Press, 2006.
-
Abstract
- Immunoglobulin-like transcripts are a family of inhibitory and stimulatory cell surface immune receptors. Transcripts for one member of this family, ILT7, are selectively expressed in human plasmacytoid dendritic cells (pDCs). We demonstrate here that ILT7 protein associates with the signal adapter protein Fc epsilonRI gamma to form a receptor complex. Using an anti-ILT7 monoclonal antibody, we show that ILT7 is expressed specifically on human pDCs, but not on myeloid dendritic cells or other peripheral blood leukocytes. Cross-linking of ILT7 resulted in phosphorylation of Src family kinases and Syk kinase and induced a calcium influx in freshly isolated pDCs, which was blocked by Src family and Syk kinases inhibitors, thus indicating the activation of an immunoreceptor-based tyrosine activation motif-mediated signaling pathway. ILT7 cross-linking on CpG or influenza virus-stimulated primary pDCs inhibited the transcription and secretion of type I interferon and other cytokines. Therefore, the ILT7-Fc epsilonRI gamma receptor complex negatively regulates the innate immune functions of human pDCs.
- Subjects :
- 0303 health sciences
Toll-like receptor
Receptor complex
CLEC7A
Chemistry
Immunology
Syk
hemic and immune systems
Plasmacytoid dendritic cell
3. Good health
Cell biology
03 medical and health sciences
0302 clinical medicine
Interferon
medicine
Immunology and Allergy
Signal transduction
Interferon type I
030304 developmental biology
030215 immunology
medicine.drug
Subjects
Details
- ISSN :
- 15409538 and 00221007
- Volume :
- 203
- Database :
- OpenAIRE
- Journal :
- Journal of Experimental Medicine
- Accession number :
- edsair.doi...........e8c4bb4779a4bc9ce024a8d653650410