A) Experimental setup for the triple SILAC labeling experiments in MA10 cells comparing single PDE4 (Rolipram, Rol) or PDE8 (PF-04957325, PF) inhibitor treatment with PDE4 and 8 inhibitor combination treatment for 1 h and the setup of the time series experiment with PDE4 and 8 inhibitor treatment for 0, 1, 15, 60 and 180 minutes. B) Phosphoproteomics workflow according to which MA10 cell samples were processed and analyzed.