Western blot analysis was performed as previously described28 (link). The primary antibodies used to probe each protein were as follows: rabbit anti-p16INK4a (1:1000; Abcam, Cambridge, UK; ab108349), mouse anti-actin (1:3000, Santa Cruz, Texas, USA; sc-47778), mouse anti-GATA4 (1:200, Santa Cruz; sc-25310), rabbit anti-p-p65 (1:1000, Cell Signaling, Massachusetts, USA; #3033), goat anti-lamin A (1:250, Santa Cruz; sc-6214, sc-6215), and mouse anti-p62 (1:1000, BD, New Jersey, USA; 610832). Secondary horseradish peroxidase (HRP)-conjugated antibodies (1:2000; Invitrogen, Carlsbad, USA; G21040, G21234) were used according to the manufacturer’s instructions, and binding was detected using an enhanced chemiluminescence (ECL) detection kit (Amersham Pharmacia Biotek, Amersham, UK).