Ig-like transcript 3 regulates expression of proinflammatory cytokines and migration of activated T cells
| Autor: | Haiyan Qin, Donna Mancini, Xugang Qiao, Raffaello Cortesini, George Vlad, Nicole Suciu-Foca, Zhuoru Liu, Charles C. Marboe, Chih-Chao Chang |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Chemokine
T cell Immunology Lymphocyte Activation Proinflammatory cytokine Cell Line Immune system Antigen Antigens CD T-Lymphocyte Subsets medicine Immunology and Allergy CXCL10 Humans Receptors Immunologic Cells Cultured biology Molecular biology Cell biology Chemotaxis Leukocyte medicine.anatomical_structure Cell culture biology.protein Cytokines Inflammation Mediators CD8 |
| Zdroj: | Journal of immunology (Baltimore, Md. : 1950). 182(9) |
| ISSN: | 1550-6606 |
| Popis: | Ig-like transcript 3 (ILT3), an inhibitory receptor expressed by APC is involved in functional shaping of T cell responses toward a tolerant state. We have previously demonstrated that membrane (m) and soluble (s) ILT3 induce allogeneic tolerance to human islet cells in humanized NOD/SCID mice. Recombinant sILT3 induces the differentiation of CD8+ T suppressor cells both in vivo and in vitro. To better understand the molecular mechanisms by which ILT3 suppresses immune responses, we have generated ILT3 knockdown (ILT3KD) dendritic cells (DC) and analyzed the phenotypic and functional characteristics of these cells. In this study, we report that silencing of ILT3 expression in DC (ILT3KD DC) increases TLR responsiveness to their specific ligands as reflected in increased synthesis and secretion of proinflammatory cytokines such as IL-1α, IL-1β, and IL-6 and type I IFN. ILT3KD-DC also secretes more CXCL10 and CXCL11 chemokines in response to TLR ligation, thus accelerating T cell migration in diffusion chamber experiments. ILT3KD-DC elicit increased T cell proliferation and synthesis of proinflammatory cytokines IFN-γ and IL-17A both in MLC and in culture with autologous DC pulsed with CMV protein. ILT3 signaling results in inhibition of NF-κB and, to a lesser extent, MAPK p38 pathways in DC. Our results suggest that ILT3 plays a critical role in the in control of inflammation. |
| Databáze: | OpenAIRE |
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