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• W2072742279 abstract "Mesenchymal stromal cells (MSC) derived from bone marrow are immunosuppressive in vitro and in vivo. Recent evidence, however, has shown that in certain settings, MSC can also be immunostimulatory. The mechanisms involved in this process are largely unknown.Mouse spleen T cells were stimulated with allogeneic mixed lymphocyte reaction (MLR) or anti-CD3/CD28 beads and treated with autologous bone marrow MSC or MSC-conditioned medium. CD4+ and CD8+ T-cell proliferation was analyzed after treatment.We show that MSC have both suppressive and stimulatory functions toward T cells after stimulation with anti-CD3/CD28 beads or in an MLR. This depended on the ratio of MSC to responder T cells, with low numbers of MSC increasing and higher numbers inhibiting T-cell proliferation. Immunostimulatory function was mediated, in part, by soluble factors. MSC immunosuppression of the MLR was indirect and related to inhibition of antigen-presenting cell maturation. Direct effects of MSC-conditioned medium during anti-CD3/CD28 stimulated proliferation were entirely stimulatory and required the presence of the T-cell receptor. MSC supernatant contained both CCL2 and CCL5 at high levels, but only CCL2 level correlated with the ability to augment proliferation. An anti-CCL2 antibody blocked this proliferative activity.CCL2 plays an important role in the immunostimulatory function of MSC, and we further hypothesize that the immunomodulatory role of MSC is determined by a balance between inhibitory and stimulatory factors, suggesting the need for caution when these cells are investigated in clinical protocols." @default.
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• W2072742279 date "2013-10-01" @default.
• W2072742279 modified "2023-09-26" @default.
• W2072742279 title "Mesenchymal stromal cells augment CD4+ and CD8+ T-cell proliferation through a CCL2 pathway" @default.
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• W2072742279 doi "https://doi.org/10.1016/j.jcyt.2013.05.009" @default.
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