Effects of ursodeoxycholic acid (UDCA) on the mRNA (A) and protein (B) expression of Bax, Bcl-2 and Bcl-xL in human oral squamous carcinoma HSC-3 cells. Fold-ratio: gene expression/GAPDH (β-actin) × control numerical value (control fold ratio: 1); (C), Bax mRNA expression fold over control; (D), Bcl-2 mRNA expression fold over control; (E), Bcl-xL mRNA expression fold over control; (F), Bax protein expression fold over control; (G), Bcl-2 protein expression fold over control; and (H), Bcl-xL protein expression fold over control. * Mean values are significantly different from control (p < 0.05) and ** mean values are significantly different from control (p < 0.01).