%0 Generic %A de Kivit S. %A A.I., Kostadinova %A J., Kerperien %A V., Ayechu Muruzabal %A M.E., Morgan %A L.M.J., Knippels %A A.D., Kraneveld %A J., Garssen %A L.E.M., Willemsen %D 2017 %T Supplementary Material for: Galectin-9 Produced by Intestinal Epithelial Cells Enhances Aldehyde Dehydrogenase Activity in Dendritic Cells in a PI3K- and p38-Dependent Manner %U https://karger.figshare.com/articles/dataset/Supplementary_Material_for_Galectin-9_Produced_by_Intestinal_Epithelial_Cells_Enhances_Aldehyde_Dehydrogenase_Activity_in_Dendritic_Cells_in_a_PI3K-_and_p38-Dependent_Manner/5387968 %R 10.6084/m9.figshare.5387968.v1 %2 https://ndownloader.figshare.com/files/9273031 %2 https://ndownloader.figshare.com/files/9273034 %2 https://ndownloader.figshare.com/files/9273037 %2 https://ndownloader.figshare.com/files/9273040 %K Dendritic cells %K Intestinal epithelial cells %K Galectin-9 %K Toll-like receptor 9 %X Intestinal epithelial cells (IEC) drive regulatory T cell (Treg) responses by promoting the differentiation of aldehyde dehydrogenase (ALDH)-expressing CD103+ dendritic cells (DC). Apical stimulation of TLR9 by CpG DNA on IEC supports galectin-9 expression by IEC, which is promoted by short-chain galacto-oligosaccharides and long-chain fructo-oligosaccharides (GF). While galectin-9 can induce the maturation of monocyte-derived DC (moDC), the contribution of galectin-9 on the induction of ALDH activity in DC is not known. To this end, DC were stimulated with galectin-9, and ALDH activity and the expression of CD103 were assessed. ALDH activity was increased by moDC exposed to galectin-9, while the expression of CD103 remained unaltered. Galectin-9 secreted by IEC apically exposed to CpG DNA and GF enhanced ALDH activity, but not CD103 expression by moDC, which was abrogated upon galectin-9 neutralization. Similar observations were found in murine GM-CSF-cultured bone marrow-derived DC (BMDC). Using Flt3L-cultured BMDC and ex vivo murine splenic DC, it was observed that galectin-9 only enhanced ALDH activity in the presence of GM-CSF in CD103- cells. The induction of ALDH activity in BMDC was dependent on p38 and PI3K signaling. These data indicate a novel role for galectin-9 in modulating innate immunity by inducing ALDH activity in DC. %I Karger Publishers