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 Blood, 15 September 2007, Vol. 110, No. 6, pp. 2197-2200.
Prepublished online as a Blood First Edition Paper on May 23, 2007; DOI 10.1182/blood-2007-04-083162.

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STEM CELLS IN HEMATOLOGY

Brief Report

Human multipotent mesenchymal stromal cells inhibit proliferation of PBMCs independently of IFN{gamma}R1 signaling and IDO expression

Friederike Gieseke1, Burkhardt Schütt2, Susanne Viebahn1, Ewa Koscielniak3, Wilhelm Friedrich4, Rupert Handgretinger1, and Ingo Müller1

1 University Children's Hospital, Department of General Pediatrics, Hematology and Oncology, Tübingen; 2 University Children's Hospital, Division of Pediatric Endocrinology, Tübingen; 3 Olga-Hospital, Stuttgart; 4 University Children's Hospital Ulm, Ulm, Germany

Multipotent mesenchymal stromal cells (MSCs) inhibit proliferation, helper, and effector functions in most if not all peripheral blood mononuclear cell (PBMC) subpopulations in vitro. The molecular mechanism is widely thought to imply tryptophan degradation by the interferon-{gamma} (IFN{gamma})–induced expression of indoleamine 2,3-dioxygenase (IDO). However, IDO inhibitors were not able to restore proliferation of PBMCs in each case. Moreover, human MSCs with an IFN{gamma} receptor 1 (R1) defect inhibited proliferation of HLA-mismatched PBMCs to a similar extent as control MSCs. In contrast to healthy MSCs, IFN{gamma}R1-deficient MSCs showed no detectable mRNA for IDO—neither in the absence nor in the presence of recombinant human IFN{gamma}, nor in coculture with HLA-mismatched PBMCs. Based on gene expression profiling, we were able to show that insulin-like growth factor (IGF)–binding proteins contribute to the inhibitory mechanism of MSCs. Taken together, human MSCs exert important immunomodulatory functions in the absence of IFN{gamma}R1 signaling and IDO, partially accounted for by IGF-binding proteins.


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