title: Changes in the cannabinoid (CB1) receptor expression level and G-protein activation in kainic acid induced seizures.
abstract: It has been known for centuries that exogenous cannabinoids, such as tetrahydrocannabinol have anticonvulsant activity. Recent studies have advanced our understanding of the endogenous cannabinoid system and renewed the interest in cannabinoids as a potential treatment for epilepsy. The endogenous cannabinoid system is rapidly activated after seizure activity but still little is known about the molecular mechanisms underlying the role of the cannabinoid system in epilepsy. In this study epileptiform activity was induced by kainic acid (KA) and effects of the CB1 receptor agonists N-(2-Chloroethyl)-5Z,8Z,11Z,14Z-eicosatetraenamide (ACEA) on G-protein signaling using the agonist-stimulated [(35)S]GTPγS binding assay were evaluated. Control and KA treated rat hippocampus and cortex membranes were used. Our results showed that the ACEA displayed a high potency and efficacy in stimulating the G-proteins and when compared to the control animals, significant enhancements were observed in tissues from the KA treated animals. Potency and efficacy values were in particular increased in the hippocampus tissues. Furthermore, gene expression levels of the cannabinoid receptor 1 (CB1) receptor and cannabinoid receptor interacting protein 1 (CRIP1) were measured by RT-PCR, where both CB1 and CRIP1 expressions were found to be elevated in the KA treated animals.
authors.affiliation: Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Temesvari krt 62, 6726 Szeged, Hungary. enginoboyniko@gmail.com
authors.forename: Engin
authors.initials: E
authors.lastname: Bojnik
authors.forename: Ezgi
authors.initials: E
authors.lastname: Turunç
authors.forename: Güliz
authors.initials: G
authors.lastname: Armağan
authors.forename: Lütfiye
authors.initials: L
authors.lastname: Kanıt
authors.forename: Sándor
authors.initials: S
authors.lastname: Benyhe
authors.forename: Ayfer
authors.initials: A
authors.lastname: Yalçın
authors.forename: Anna
authors.initials: A
authors.lastname: Borsodi
mesh_terms: D000818:Animals; D001095:Arachidonic Acids / Q000494:pharmacology; D002186:Cannabinoids / Q000096:biosynthesis; D002352:Carrier Proteins / Q000819:agonists / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D019204:GTP-Binding Proteins / Q000378:metabolism*; D005786:Gene Expression Regulation; D007608:Kainic Acid / Q000633:toxicity*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D043884:Receptor, Cannabinoid, CB1 / Q000819:agonists / Q000378:metabolism*; D012640:Seizures / Q000139:chemically induced / Q000378:metabolism*
chemical_list: D001095:Arachidonic Acids; D002186:Cannabinoids; D002352:Carrier Proteins; C540799:Cnrip1 protein, rat; D043884:Receptor, Cannabinoid, CB1; C119325:arachidonyl-2-chloroethylamide; D019204:GTP-Binding Proteins; D007608:Kainic Acid