Figure 10: Model of Del-1 regulation.

IL-17 downregulates Del-1 expression through a GSK3β- and C/EBPβ-dependent mechanism, which inhibits the binding of the critical transcription factor C/EBPβ to the EDIL3 promoter. This inhibitory action of IL-17 is counteracted at the GSK3β level by D-series resolvins in a PI3K/Akt-dependent manner. In stark contrast to IL-17, IFNγ enhances the binding of C/EBPβ to the EDIL3 promoter and upregulates Del-1 expression.