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Stem Cells International
Volume 2015, Article ID 819084, 15 pages
http://dx.doi.org/10.1155/2015/819084
Research Article

Human Bone Marrow-Derived Mesenchymal Stromal Cells Differentially Inhibit Cytokine Production by Peripheral Blood Monocytes Subpopulations and Myeloid Dendritic Cells

1Blood and Transplantation Center of Coimbra, Portuguese Institute of the Blood and Transplantation, Quinta da Vinha Moura, São Martinho do Bispo, 3041-861 Coimbra, Portugal
2QOPNA, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
3Signal Transduction Laboratory, Center of Cellular Biology, SACS and Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
4Cell2B Advanced Therapeutics, SA, Biocant Park, Núcleo 04, Lote 4A, 3060-197 Cantanhede, Portugal
5Serviço de Transplantação de Progenitores Hematopoiéticos (UTM), Instituto Português de Oncologia de Lisboa Francisco Gentil, Rua Professor Lima Basto, 1099-023 Lisboa, Portugal

Received 24 February 2015; Accepted 5 April 2015

Academic Editor: Eva Mezey

Copyright © 2015 Paula Laranjeira et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The immunosuppressive properties of mesenchymal stromal/stem cells (MSC) rendered them an attractive therapeutic approach for immune disorders and an increasing body of evidence demonstrated their clinical value. However, the influence of MSC on the function of specific immune cell populations, namely, monocyte subpopulations, is not well elucidated. Here, we investigated the influence of human bone marrow MSC on the cytokine and chemokine expression by peripheral blood classical, intermediate and nonclassical monocytes, and myeloid dendritic cells (mDC), stimulated with lipopolysaccharide plus interferon (IFN)γ. We found that MSC effectively inhibit tumor necrosis factor- (TNF-) α and macrophage inflammatory protein- (MIP-) 1β protein expression in monocytes and mDC, without suppressing CCR7 and CD83 protein expression. Interestingly, mDC exhibited the highest degree of inhibition, for both TNF-α and MIP-1β, whereas the reduction of TNF-α expression was less marked for nonclassical monocytes. Similarly, MSC decreased mRNA levels of interleukin- (IL-) 1β and IL-6 in classical monocytes, CCL3, CCL5, CXCL9, and CXCL10 in classical and nonclassical monocytes, and IL-1β and CXCL10 in mDC. MSC do not impair the expression of maturation markers in monocytes and mDC under our experimental conditions; nevertheless, they hamper the proinflammatory function of monocytes and mDC, which may impede the development of inflammatory immune responses.