title: The role of technical, biological, and pharmacological factors in the laboratory evaluation of anticonvulsant drugs. V. Lack of seasonal influences on amygdala kindling in rats.
abstract: Previous studies have suggested that seizure models may be affected by seasonal rhythms, even under controlled environmental conditions. In the present experiments in rats with chronically implanted electrodes in the basolateral amygdala, kindling was initiated at different seasons of the year over a period of 3 years. In a total of 109 animals, the following parameters were determined: the threshold for induction of amygdaloid afterdischarges prior to kindling (pre-kindling ADT), the number of daily amygdaloid stimulations to fully kindled (stage 5) seizures, and the post-kindling ADT. No seasonal influences were found with respect to rate of kindling development and post-kindling ADT. In contrast, pre-kindling ADTs appeared to be higher in spring than in other seasons, which, however, could not be reproduced in another spring. Thus, the data do not indicate that seasonal rhythms affect the kindling model of epilepsy.
authors.affiliation: Department of Pharmacology, Toxicology, and Pharmacy, School of Veterinary Medicine, Hannover, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Wlaź
authors.forename: W
authors.initials: W
authors.lastname: Löscher
mesh_terms: D000679:Amygdala / Q000187:drug effects* / Q000502:physiology* / Q000503:physiopathology; D000818:Animals; D000927:Anticonvulsants / Q000494:pharmacology*; D004353:Drug Evaluation, Preclinical / Q000379:methods; D004558:Electric Stimulation; D005260:Female; D007696:Kindling, Neurologic; D010507:Periodicity; D051381:Rats; D017208:Rats, Wistar; D012621:Seasons; D012640:Seizures / Q000503:physiopathology*
chemical_list: D000927:Anticonvulsants