The effect of PsA treatment on apoptotic markers in the human RWPE-1 non-tumorigenic prostate epithelial cells. (a) Immunoblots of Bcl-2, Bax, caspase-3 and caspase-7, and β-tubulin from the cell lysate in control, and PsA-treated cells at 1 and 2 mM. (b) Densitometric analysis of apoptotic markers protein bands relative to tubulin in each band for B-cell lymphoma 2 (Bcl-2), Bcl-2 associated X-protein (Bax), caspase-3, and caspase-7. * indicates a statistical significance at p < 0.05, *** indicates a statistical significance at p < 0.001, and **** indicates a statistical significance at p < 0.0001 at specified concentrations vs. control.