Anticonvulsants/therapeutic use; Ascorbic Acid/therapeutic use; Benzoquinones/therapeutic use; Cerebral Cortex/drug effects; GABA-B Receptor Agonists/therapeutic use; Hippocampus/drug effects; Nerve Tissue Proteins/physiology; Neuroprotective Agents/therapeutic use; Receptors, GABA-B/physiology; Seizures/drug therapy; Animals; Anticonvulsants/pharmacology; Antioxidants/pharmacology; Antioxidants/therapeutic use; Ascorbic Acid/pharmacology; Benzoquinones/pharmacology; Calcium-Calmodulin-Dependent Protein Kinase Type 2/genetics; Calcium-Calmodulin-Dependent Protein Kinase Type 2/metabolism; Caspase 3/metabolism; Cerebral Cortex/metabolism; Cerebral Cortex/pathology; Convulsants/toxicity; Cyclic AMP Response Element-Binding Protein/metabolism; Cyclic AMP-Dependent Protein Kinases/genetics; Cyclic AMP-Dependent Protein Kinases/metabolism; Electroencephalography/drug effects; Enzyme Activation/drug effects; Enzyme Induction/drug effects; GABA-A Receptor Antagonists/toxicity; GABA-B Receptor Agonists/pharmacology; Hippocampus/metabolism; Hippocampus/pathology; Nerve Degeneration; Nerve Tissue Proteins/biosynthesis; Nerve Tissue Proteins/genetics; Neuroprotective Agents/pharmacology; Pentylenetetrazole/toxicity; Rats; Rats, Sprague-Dawley; Receptors, GABA-B/biosynthesis; Receptors, GABA-B/genetics; Seizures/chemically induced; Seizures/metabolism; Signal Transduction/drug effects; Up-Regulation/drug effects