Table 3. Comparison of HSP70, Apaf-1, and caspase-3 protein expression levels in PC-3 cells in each group ($\overline{x}\pm s$).

Groups	HSP70	Apaf-1	caspase-3
Control group	1.62±0.51	0.46±0.11	0.37±0.12
Brucine low dose group	1.33±0.43**	1.24±0.24**	0.88±0.17**
Brucine medium dose group	0.99±0.41**	1.87±0.31**	1.35±0.24**
Brucine high dose group	0.51±0.13**	2.24±0.47**	1.67±0.28**

**P<0.01 compared to control group; HSP70, heat shock protein 70; Apaf-1, anti-apoptotic protease activating factor 1; caspase-3, anti-cysteine protease-3.