Brain-Derived Neurotrophic Factor/metabolism; Cerebral Cortex/cytology; Excitatory Amino Acid Agonists/pharmacology; Gene Expression Regulation/physiology; N-Methylaspartate/pharmacology; Neurons/drug effects; Receptors, Aryl Hydrocarbon/metabolism; Animals; Brain-Derived Neurotrophic Factor/genetics; CREB-Binding Protein/metabolism; Calcium/metabolism; Cells, Cultured; Chromatin Immunoprecipitation/methods; Dose-Response Relationship, Drug; Embryo, Mammalian; Excitatory Amino Acid Antagonists/pharmacology; Female; Gene Expression Regulation/drug effects; Inhibitory Postsynaptic Potentials/drug effects; Membrane Potentials/drug effects; Membrane Potentials/genetics; Neurons/metabolism; Patch-Clamp Techniques/methods; Pregnancy; Promoter Regions, Genetic/drug effects; Protein Transport/drug effects; RNA, Small Interfering/genetics; RNA, Small Interfering/metabolism; Rats; Rats, Sprague-Dawley; Receptors, Aryl Hydrocarbon/antagonists & inhibitors; Receptors, N-Methyl-D-Aspartate/metabolism; Transfection