Fig. 1

CD107a-expressing NK cells after exposure to pre-treated ucMSC. a Representative FACS plots of CD107a expression on NK cells, without ucMSC (left), with untreated ucMSC (middle), with IFN-γ-treated ucMSC (right) b Graph displaying boxplots of CD107a-expressing NK cells after exposure to the various pre-treated MSC (untreated, IFN-γ, IFN-β, TGFβ, starvation, vitamin B₆, Starv + VitB₆, retinoic acid and combination IFN-γ + TGFβ + RA (MC)). Results are shown as means ± SEM (n = 4). ^*Indicates significant difference (p < 0.05). IFN-γ interferon gamma, MC multiple cytokine cocktail, NK natural killer cells, RA retinoic acid, Starv starvation, serum deprivation, TGFβ transforming growth factor beta, ucMSC umbilical cord-derived mesenchymal stromal cells, VitB ₆ vitamin B₆, pyridoxal hydrochloride