Volume 13, Issue 9b pp. 3415-3426

Toll-like receptor triggering in cord blood mesenchymal stem cells

Lieke C.J. van den Berk

Lieke C.J. van den Berk

Department of Tumor Immunology, Nijmegen Centre for Molecular Life Sciences, Geert Grooteplein, Nijmegen, The Netherlands

These authors contributed equally to this work.

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Bastiaan J.H. Jansen

Bastiaan J.H. Jansen

Department of Tumor Immunology, Nijmegen Centre for Molecular Life Sciences, Geert Grooteplein, Nijmegen, The Netherlands

These authors contributed equally to this work.

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Kim G.C. Siebers-Vermeulen

Kim G.C. Siebers-Vermeulen

Department of Tumor Immunology, Nijmegen Centre for Molecular Life Sciences, Geert Grooteplein, Nijmegen, The Netherlands

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Mihai G. Netea

Mihai G. Netea

Department of Internal Medicine, Radboud University Nijmegen Medical Centre, Geert Grooteplein, Nijmegen, The Netherlands

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Talia Latuhihin

Talia Latuhihin

Department of Tumor Immunology, Nijmegen Centre for Molecular Life Sciences, Geert Grooteplein, Nijmegen, The Netherlands

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Saskia Bergevoet

Saskia Bergevoet

Department of Hematology, University Medical Centre St. Radboud, Geert Grooteplein, Nijmegen, The Netherlands

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Reinier A. Raymakers

Reinier A. Raymakers

Department of Hematology, University Medical Centre St. Radboud, Geert Grooteplein, Nijmegen, The Netherlands

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Gesine Kögler

Gesine Kögler

Institute for Transplantation Diagnostics and Cell Therapeutics, University of Duesseldorf Medical School, Moorenstrasse, Düsseldorf, Germany

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Carl C. Figdor

Carl C. Figdor

Department of Tumor Immunology, Nijmegen Centre for Molecular Life Sciences, Geert Grooteplein, Nijmegen, The Netherlands

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Gosse J. Adema

Gosse J. Adema

Department of Tumor Immunology, Nijmegen Centre for Molecular Life Sciences, Geert Grooteplein, Nijmegen, The Netherlands

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Ruurd Torensma

Corresponding Author

Ruurd Torensma

Department of Tumor Immunology, Nijmegen Centre for Molecular Life Sciences, Geert Grooteplein, Nijmegen, The Netherlands

Correspondence to: Ruurd TORENSMA, Department of Tumor Immunology, NCMLS, Geert Grooteplein 28, 6525 GA, Nijmegen, The Netherlands.
Tel.: +31-243617600
Fax: +31-243540339
E-mail: [email protected].Search for more papers by this author
First published: 29 January 2010
Citations: 46

Abstract

Recently, the antagonizing effect on the differentiation of mesenchymal stem cells (MSCs) by toll-like receptor (TLR) ligands, was described. Our study shows that on more primitive cord blood derived MSCs, the expression of TLRs and ligand-induced triggering differs from that of bone marrow derived MSCs. At the RNA level, cord blood MSCs (unrestricted somatic stem cells; USSCs) express low levels of TLR1,3,5,9 and high levels of TLR4 and TLR6. At the protein level expression of TLR5 and very low expression of TLR4 was observed. NF-κB translocation studies revealed that both TLR4 and TLR5 are functional, although signalling kinetics induced by the individual ligands differed. Stimulation of USSCs with either lipopolysaccharide (LPS) or flagellin resulted in a marked increase of interleukin (IL)-6 and/or IL-8 production although levels differed significantly between both stimuli. Interestingly, tumour necrosis factor (TNF)-α was undetectable after TLR stimulation, which appeared to be due to an inactivated TNF-α promoter in USSCs. Moreover, osteoblastic differentiation was enhanced after triggering USSCs with LPS and flagellin. In summary, TLR4 and 5 signalling in USSCs is slow and results in the up-regulation of a restricted number of pro-inflammatory cytokines and enhanced osteoblastic differentiation. Apparently, the outcome of TLR signalling depends on the cell type that expresses them.

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