Effects of VPA on cPAcP protein expression and ErbB-2 tyrosyl phosphorylation. LNCaP C-81 cells were plated in three cell dinsities (0.3, 0.5 and 1×106 cells/T25) in regular medium for 2 days and then treated with 1 mM VPA for 48 hr. The cells were harvested and the total protein was subjected to western blot analyses of functional proteins expression. VPA effects on cPAcP protein expression, ErbB-2 phosphorylation at Tyr1221/2 and Tyr1248, histone H3 and H4 acetylation and methylation, JNK and p38 phosphorylation, Bcl-2 and Bax protein levels. β-Actin was detected as a loading control. The data shown is a representative from three sets of independent experiments.