TAT-CC2 peptide binds to endogenous NEMO in OCPs and inhibits NEMO oligomerization. Wild-type (WT) and mutated (mut) CC2 peptides (50 μM) were added to cells and (A) stimulated with vehicle, RANKL, or TNF for 30 min. Lysates (lanes 1–6) were pre-cleared with IgG, immunoprecipitated with anti HA antibody and then blotted with anti NEMO antibody. Lane 7 represents a positive control (PC) for NEMO expressed in TNF-stimulated cells (crude lysate). Lower panel represents β-actin expression in equal concentrations of total protein from crude lysates collected from the respective samples before immunoprecipitation, used as loading control. B: Cells were treated with either WT-CC2 or mut-CC2 for the time points indicated. Cell lysates were processed for immunoblots in non-reducing conditions. Superscript numbers 1, 2, and 3 indicate NEMO monomer, dimer, or trimer, respectively.