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Bone marrow-mesenchymal stromal cells (BM-MSCs) have immunosuppressive properties and have been used in cell therapies as immune regulators for the treatment of graft-versus-host disease. We have previously characterized several biological properties of MSCs from placenta (PL) and umbilical cord blood (UCB), and compared them to those of BM-the gold standard. In the present study, we have compared MSCs from BM, UCB, and PL in terms of their immunosuppressive properties against lymphoid cell populations enriched for CD3 + T cells. Our results confirm the immunosuppressive potential of BM-MSCs, and demonstrate that MSCs from UCB and, to a lesser extent PL, also have immunosuppressive potential. In contrast to PL-MSCs, BMMSCs and UCB-MSCs significantly inhibited the proliferation of both CD4+ and CD8 + activated T cells in a cell-cell contact-dependent manner. Such a reduced proliferation in cell cocultures correlated with upregulation of programmed death ligand 1 on MSCs and cytotoxic T lymphocyte-associated Ag-4 (CTLA-4) on T cells, and increased production of interferon-g, interleukin-10, and prostaglandin E2. Importantly, and in contrast to PL-MSCs, both BM-MSCs and UCB-MSCs favored the generation of T-cell subsets displaying a regulatory phenotype CD4 + CD25 + CTLA-4 + . Our results indicate that, besides BM-MSCs, UCB-MSCs might be a potent and reliable candidate for future therapeutic applications.

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