Chatterjee, D.; Marquardt, N.; Tufa, D.M.; Hatlapatka, Tim; Hass, R.: Human umbilical cord-derived mesenchymal stem cells utilise activin-A to suppress interferon-gamma production by natural killer cells. In: Frontiers in Immunology 5 (2014), 662. DOI: http://dx.doi.org/10.3389/fimmu.2014.00662
Zusammenfassung: | |
Following allogeneic hematopoietic stem cell transplantation (HSCT), interferon (IFN)-γ levels in the recipient's body can strongly influence the clinical outcome. Human umbilical cord-derived mesenchymal stem cells (UC-MSCs) are lucrative as biological tolerance inducers in HSCT settings. Hence, we studied the molecular mechanism of how UC-MSCs influence natural killer (NK) cell-mediated IFN-γ production. Allogeneic NK cells were cultured in direct contact with UC-MSCs or cell free supernatants from MSC cultures (MSC conditioned media). We found that soluble factors secreted by UC-MSCs strongly suppressed IL-12/IL-18-induced IFN-γ production by NK cells by reducing phosphorylation of STAT4, NF-κB as well as T-bet activity. UC-MSCs secreted considerable amounts of Activin-A, which could suppress IFN-γ production by NK cells. Neutralisation of Activin-A in MSC conditioned media significantly abrogated their suppressive abilities. Till date, multiple groups have reported that prostaglandin (PG)-E2 produced by MSCs can suppress NK cell functions. Indeed, we found that inhibition of PGE2 production by MSCs could also significantly restore IFN-γ production. However, the effects of Activin-A and PGE2 were not cumulative. To the best of our knowledge, we are first to report the role of Activin-A in MSC mediated suppression of IFN-γ production by NK cells. | |
Lizenzbestimmungen: | CC BY 4.0 Unported |
Publikationstyp: | Article |
Publikationsstatus: | publishedVersion |
Erstveröffentlichung: | 2014 |
Die Publikation erscheint in Sammlung(en): | Naturwissenschaftliche Fakultät |
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