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Toll-like receptor engagement enhances the immunosuppressive properties of human bone marrow-derived mesenchymal stem cells by inducing indoleamine-2,3-dioxygenase-1 via interferon-beta and protein kinase R


Opitz, C A; Litzenburger, U M; Lutz, C; Lanz, T V; Tritschler, I; Köppel, A; Tolosa, E; Hoberg, M; Anderl, J; Aicher, W K; Weller, M; Wick, W; Platten, M (2009). Toll-like receptor engagement enhances the immunosuppressive properties of human bone marrow-derived mesenchymal stem cells by inducing indoleamine-2,3-dioxygenase-1 via interferon-beta and protein kinase R. Stem Cells, 27(4):909-919.

Abstract

Mesenchymal stem cells (MSC) display unique suppressive properties on T-cell immunity, thus representing an attractive vehicle for the treatment of conditions associated with harmful T-cell responses such as organ-specific autoimmunity and graft-versus-host disease. Toll-like receptors (TLR) are primarily expressed on antigen-presenting cells and recognize conserved pathogen-derived components. Ligation of TLR activates multiple innate and adaptive immune response pathways to eliminate and protect against invading pathogens. In this work, we show that TLR expressed on human bone marrow-derived MSC enhanced the immunosuppressive phenotype of MSC. Immunosuppression mediated by TLR was dependent on the production of immunosuppressive kynurenines by the tryptophan-degrading enzyme indoleamine-2,3-dioxygenase-1 (IDO1). Induction of IDO1 by TLR involved an autocrine interferon (IFN)-beta signaling loop, which was dependent on protein kinase R (PKR), but independent of IFN-gamma. These data define a new role for TLR in MSC immunobiology, which is to augment the immunosuppressive properties of MSC in the absence of IFN-gamma rather than inducing proinflammatory immune response pathways. PKR and IFN-beta play a central, previously unidentified role in orchestrating the production of immunosuppressive kynurenines by MSC.

Abstract

Mesenchymal stem cells (MSC) display unique suppressive properties on T-cell immunity, thus representing an attractive vehicle for the treatment of conditions associated with harmful T-cell responses such as organ-specific autoimmunity and graft-versus-host disease. Toll-like receptors (TLR) are primarily expressed on antigen-presenting cells and recognize conserved pathogen-derived components. Ligation of TLR activates multiple innate and adaptive immune response pathways to eliminate and protect against invading pathogens. In this work, we show that TLR expressed on human bone marrow-derived MSC enhanced the immunosuppressive phenotype of MSC. Immunosuppression mediated by TLR was dependent on the production of immunosuppressive kynurenines by the tryptophan-degrading enzyme indoleamine-2,3-dioxygenase-1 (IDO1). Induction of IDO1 by TLR involved an autocrine interferon (IFN)-beta signaling loop, which was dependent on protein kinase R (PKR), but independent of IFN-gamma. These data define a new role for TLR in MSC immunobiology, which is to augment the immunosuppressive properties of MSC in the absence of IFN-gamma rather than inducing proinflammatory immune response pathways. PKR and IFN-beta play a central, previously unidentified role in orchestrating the production of immunosuppressive kynurenines by MSC.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Neurology
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2009
Deposited On:18 Nov 2009 14:11
Last Modified:21 Nov 2017 14:27
Publisher:AlphaMed Press
ISSN:1066-5099
Publisher DOI:https://doi.org/10.1002/stem.7
PubMed ID:19353519

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