Ig-like transcript 3 regulates expression of proinflammatory cytokines and migration of activated T cells

Chih Chao Chang, Zhuoru Liu, George Vlad, Haiyan Qin, Xugang Qiao, Donna M. Mancini, Charles C. Marboe, Raffaello Cortesini, Nicole Suciu-Foca

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

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-γand 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.

Original languageEnglish
Pages (from-to)5208-5216
Number of pages9
JournalJournal of Immunology
Volume182
Issue number9
DOIs
StatePublished - 1 May 2009
Externally publishedYes

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