Immediate and delayed treatment with gabapentin, carbamazepine and CNQX have almost similar impact on cognitive functions and behavior in the lithium-pilocarpine model in rats

• Published in: Pharmacology, biochemistry and behavior Vol. 148; pp. 128 - 135
• Main Authors: Gulec Suyen, Guldal, Isbil-Buyukcoskun, Naciye, Kahveci, Nevzat, Sengun, Ece, Ozluk, Kasim
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.09.2016
• Subjects: 6-Cyano-7-nitroquinoxaline-2,3-dione - pharmacology; Amines - pharmacology; Animals; Behavior; Behavior, Animal - drug effects; Carbamazepine; Carbamazepine - pharmacology; CNQX; Cognition - drug effects; Cognitive; Cyclohexanecarboxylic Acids - pharmacology; Disease Models, Animal; Gabapentin; gamma-Aminobutyric Acid - pharmacology; Lithium - pharmacology; Male; Maze Learning - drug effects; Motor Activity - drug effects; Pilocarpine - pharmacology; Rat; Rats; Rats, Wistar; Status epilepticus; Status Epilepticus - chemically induced; Status Epilepticus - drug therapy; Status Epilepticus - psychology; Gabapentin; Rat; Cognitive; Behavior; CNQX; Status epilepticus; Carbamazepine
• ISSN: 0091-3057; 1873-5177
• DOI: 10.1016/j.pbb.2016.07.003

In the present study, we aimed to investigate the effects of immediate and delayed treatment with intracerebroventricular (i.c.v.) gabapentin (GBP), carbamazepine (CBZ) and 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) on learning and memory, anxiety, and locomotor activity in rats with lithium-pilocarpine-induced status epilepticus (SE). SE was induced by intraperitoneal injections of 3mEq/kg LiCl followed by 45mg/kg pilocarpine 24h later. In the first series of experiments, rats were divided into four groups three hours after the onset of SE and received GBP (100μg/10μl, two times a day; i.c.v.), CBZ (200μg/10μl; i.c.v.), CNQX (25nmol/10μl; i.c.v.) or saline (10μl; i.c.v.) for 7days. Six weeks after SE, cognitive and behavioral performances were evaluated by Morris water maze, elevated plus maze, and open field tests. In the second series, rats received no treatment for six weeks following SE. On the seventh week the same treatment with the previous rats was given and six weeks later the cognitive and behavioral tests were applied. SE significantly impaired spatial learning and memory in the Morris water maze. GBP treatment improved the acqusition and memory performance. CNQX worsened the acqusition but improved the memory performance, while CBZ worsened both parameters. In the elevated plus maze, epileptic rats which received saline showed significantly lower anxiety levels with respect to the naive rats. Only CBZ led to further anxiolysis, while the other drugs had no effect. Locomotor activity significantly increased due to SE, which was augmented by GBP and CNQX. The impact of immediate and delayed treatment with these drugs on cognition and behavior seems to be quite similar. •Epilepsy leads to cognitive and behavioral deficits.•Gabapentin improved learning and memory and increased locomotor activity.•Carbamazepine worsened learning and memory and resulted in anxiolysis.•CNQX worsened learning, improved memory and increased locomotor activity.•The impact of immediate and delayed treatments seems to be quite similar.