Inhibitory effects of GSK3, p52, RelB, and p50 on pro-inflammatory transcription following TNF long term exposure. TNF long term incubation leads to an activation of IDO1 and GSK3. NF-κB2-p100 is degraded to its active form p52 in an IDO-dependent manner. Following translation to the nucleus the non-canonical p52 and RelB homo- and heterodimers, as well as canonical p50, homodimers contribute to the inhibition of pro-inflammatory gene expression. RelB/p52 complexes are also involved in the induction of IDO1 expression. GSK3 mediates phosphorylation of C/EBPβ (T235). Interaction of C/EBPβ with p65 inhibits the transcriptional activity of p65. Please find the relevant literature in the text of the Discussion.