Sodium arsenite induces apoptosis in PC12 cells by activating the stress-activated p38 MAP kinase and the pro-apoptotic Bcl-2 family protein Bim EL . However, the relationship between p38 and Bim EL in this apoptosis has not been fully defined. Here, we report that sodium arsenite stimulates the protein expression and promoter activity of Bim EL in a p38-dependent manner. Sodium arsenite also caused nuclear translocation of FOXO3a, indicative of FOXO3a activation. Addition of a p38 inhibitor prevented FOXO3a nuclear translocation. RNAi knock down of FOXO3a inhibited Bim promoter activity, Bim EL protein expression, and arsenite-induced apoptosis. Our data identify p38 activation of FOXO3a and subsequent induction of Bim EL expression as a novel apoptotic mechanism. Together with our previous finding that Bim EL is phosphorylated and activated by p38, these results demonstrate that p38 induces apoptosis by regulating Bim EL at both the transcriptional and post-translational levels.