Glucocorticoids/antagonists & inhibitors; Neurons/physiology; Receptors, Glucocorticoid/metabolism; Recombinant Fusion Proteins/pharmacology; Stress, Physiological/metabolism; 11-beta-Hydroxysteroid Dehydrogenase Type 2/genetics; 11-beta-Hydroxysteroid Dehydrogenase Type 2/metabolism; Animals; Blotting, Western/methods; Cell Count/methods; Cell Death/drug effects; Cell Death/genetics; Culture Techniques; Estrogen Receptor alpha; Fibroblast Growth Factors/genetics; Fibroblast Growth Factors/metabolism; Gene Expression Regulation/drug effects; Gene Expression Regulation/genetics; Hippocampus/drug effects; Hippocampus/physiology; Humans; Immediate-Early Proteins; Immunohistochemistry/methods; Indoles; Kainic Acid/toxicity; Male; Microtubule-Associated Proteins/metabolism; Models, Molecular; Neurons/drug effects; Nuclear Proteins/genetics; Nuclear Proteins/metabolism; Protein Serine-Threonine Kinases/genetics; Protein Serine-Threonine Kinases/metabolism; Protein Structure, Tertiary/physiology; RNA, Messenger/metabolism; Rats; Receptors, Estrogen/genetics; Receptors, Estrogen/metabolism; Receptors, Glucocorticoid/genetics; Receptors, N-Methyl-D-Aspartate/genetics; Receptors, N-Methyl-D-Aspartate/metabolism; Reverse Transcriptase Polymerase Chain Reaction/methods; Stress, Physiological/genetics; Transgenes; Translocation, Genetic/physiology