Bacterial Proteins; Neurons/metabolism; Protein Serine-Threonine Kinases; cdc42 GTP-Binding Protein/physiology; rac GTP-Binding Proteins/physiology; Actins/metabolism; Adenoviridae/genetics; Animals; Apoptosis; Bacterial Toxins/pharmacology; Calcium-Calmodulin-Dependent Protein Kinases/metabolism; Caspase 3; Caspases/metabolism; Cell Nucleus/metabolism; Cell Survival; Cells, Cultured; Culture Media, Serum-Free/pharmacology; Cytoskeleton/metabolism; Enzyme Activation; Glycogen Synthase Kinase 3; Glycogen Synthase Kinases; Immunoblotting; Immunohistochemistry; Mitogen-Activated Protein Kinases/metabolism; Neurons/cytology; Phosphorylation; Potassium/pharmacology; Protein Binding; Proto-Oncogene Proteins/metabolism; Proto-Oncogene Proteins c-akt; Proto-Oncogene Proteins c-jun/metabolism; Rats; Signal Transduction; Transcription, Genetic; cdc42 GTP-Binding Protein/antagonists & inhibitors; cdc42 GTP-Binding Protein/metabolism; p38 Mitogen-Activated Protein Kinases; rac GTP-Binding Proteins/antagonists & inhibitors; rac GTP-Binding Proteins/metabolism; rho GTP-Binding Proteins/antagonists & inhibitors; rho GTP-Binding Proteins/metabolism