Mitogen-Activated Protein Kinases/metabolism; Phosphatidylinositol 3-Kinases/metabolism; Protein Serine-Threonine Kinases; Receptors, Metabotropic Glutamate/metabolism; Signal Transduction/physiology; Trans-Activators; Active Transport, Cell Nucleus/drug effects; Aminobutyrates/pharmacology; Animals; Apoptosis/drug effects; Cell Division/drug effects; Cell Division/physiology; Cells, Cultured; Cytoskeletal Proteins/metabolism; Enzyme Activation/drug effects; Enzyme Inhibitors/pharmacology; Excitatory Amino Acid Agonists/pharmacology; Excitatory Amino Acid Antagonists/pharmacology; MAP Kinase Signaling System/physiology; Mitogen-Activated Protein Kinases/antagonists & inhibitors; Neurons/drug effects; Neurons/enzymology; Neuroprotective Agents/pharmacology; Phosphoinositide-3 Kinase Inhibitors; Phosphorylation/drug effects; Potassium/metabolism; Potassium/pharmacology; Proto-Oncogene Proteins/metabolism; Proto-Oncogene Proteins c-akt; Rats; Receptors, Metabotropic Glutamate/agonists; Receptors, Metabotropic Glutamate/antagonists & inhibitors; beta Catenin