A pSuper shRNA construct was used to knock down the expression of GAPDH (22). The p38 inhibitor SB203580 and JNK inhibitor SP600125 were purchased from Alexis Biochemicals. Antibodies for GAPDH (clones V18 and 6C5), Siah1 (P-18), ASK1 (F-9 and N-19), Myc (9E10), GADD 153 (B3...