FIGURE 8.
Schematic representation of GADD45β-driven C/EBPβ modulation of Col10a1 during chondrocyte terminal differentiation. GADD45β through the MTK1/MKK3/6/p38 axis may promote chondrocyte terminal differentiation via p38-dependent phosphorylation of the C/EBPβ-TAD4 to promote protein-protein interactions with CBP-p300 or TAF2B/TBP to recruit the polymerase II complex and enhance transcriptional activation of Col10a1. GADD45β-C/EBP-responsive element 1 (GCRE) is the binding site for C/EBPβ that we identified in the Col10a1 promoter (TCATGCAATA). TF, transcription factor.