Abstract
Human multipotent mesenchymal stromal cells (MSCs) exhibit multilineage differentiation potential, support hematopoiesis, and inhibit proliferation and effector function of various immune cells. On the basis of these properties, MSC are currently under clinical investigation in a range of therapeutic applications including tissue repair and immune-mediated disorders such as graft-versus-host-disease refractory to pharmacological immunosuppression. Although initial clinical results appear promising, there are significant concerns that application of MSC might inadvertently suppress antimicrobial immunity with an increased risk of infection. We demonstrate here that on stimulation with inflammatory cytokines human MSC exhibit broad-spectrum antimicrobial effector function directed against a range of clinically relevant bacteria, protozoal parasites and viruses. Moreover, we identify the tryptophan catabolizing enzyme indoleamine 2,3-dioxygenase (IDO) as the underlying molecular mechanism. We furthermore delineate significant differences between human and murine MSC in that murine MSC fail to express IDO and inhibit bacterial growth. Conversely, only murine but not human MSC express inducible nitric oxide synthase on cytokine stimulation thus challenging the validity of murine in vivo models for the preclinical evaluation of human MSC. Collectively, our data identify human MSC as a cellular immunosuppressant that concurrently exhibits potent antimicrobial effector function thus encouraging their further evaluation in clinical trials.
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Acknowledgements
We thank D Klostermann for technical assistance. Moreover, we want to acknowledge M Herten (Department of Orthopedics, Heinrich-Heine-University Düsseldorf) for performing chondrogenic differentiation assays and P Verde (Coordination Center for Clinical Trials, Heinrich-Heine-University Düsseldorf) for expert statistical advice. Human CMV was kindly provided by C Sinzger (Institute for Medical Virology, University of Tübingen, Germany) and Toxoplasma gondii tachyzoites were obtained from M Saathoff and HM Seitz (Institute for Medical Parasitology, University of Bonn, Germany). This work was supported by German Federal Ministry of Education and Research (BMBF) Grants nos. 01GN0990 (RM, DD), 01GM0873 (RM, DD), 01GN0951 (RS, WD), 01GN0952 (RH) and 01GN0949 (JS), German Research Council (DFG) Grant no. RU729 (WD) and the ‘Elterninitiative Kinderkrebsklinik Düsseldorf e.V.’ (RM).
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RM and WD designed research; RM, SB, KH, ÖD, HB, CW, SS, WS, MJ, RS, RH, JS, DD and WD performed research; RM, RS and WD analyzed data; and RM, DD and WD wrote the paper.
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Meisel, R., Brockers, S., Heseler, K. et al. Human but not murine multipotent mesenchymal stromal cells exhibit broad-spectrum antimicrobial effector function mediated by indoleamine 2,3-dioxygenase. Leukemia 25, 648–654 (2011). https://doi.org/10.1038/leu.2010.310
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DOI: https://doi.org/10.1038/leu.2010.310
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