Validation of proteomic results. (A) Acetylation and (B) succinylation of whole proteins in breast cancer tissues (T) and adjacent normal tissues (N) examined via western blotting. GAPDH was used as a loading control. (C) Acetylation and succinylation of proteins ~40 kDa (used for indicating NPM1) in breast cancer tissues (T) and adjacent normal tissues (N) examined via western blotting. GAPDH was used as a loading control. (D) MCF-7 cells overexpressing NPM1 (MCF-7-NPM1) and PCDNA3.0 (MCF-7-PCDNA3.0, used as control) were collected for the protein extraction. Expression level of NPM1 and its acetylation and succinylation were detected via western blotting. GAPDH was used as a loading control. (E) BT549 cells overexpressing NPM1 (BT549-NPM1), PCI2 (BT549-PCI2, used as control) and the variants of NPM1 (NPM1-K27R, lysine mutated into arginine) were collected for protein extraction. Expression level of NPM1 and its acetylation and succinylation were detected via western blotting. GAPDH was used as a loading control. (F) Viability of BT549 cells overexpressing NPM1 (NPM1), PCI2 (PCI2, used as control) and the variants of NPM1 (K27R, lysine mutated into arginine) was detected via MTT methods. *P<0.05. (G) Expression of H2A.X in breast cancer tissues (T) and adjacent normal tissues (N) were detected via western blotting. GAPDH was used as a loading control. The H2A.X and the succinylation bands from N4 to T6 shows non-adjacent bands from the same gel, therefore they used the same GAPDH result. NPM1, nucleophosmin; H2A.X, histone H2A.X.