title: Tolerance to seizure induced by kainic acid is produced in a specific period of zebrafish development.
abstract: During brain development, the electrical disturbance promoted by a seizure can have several consequences, because it can disturb a set of steps extremely regulated needed to the correct brain maturation. Animal modeling of seizure is invaluable to contribute to the mechanistic understanding of punctual seizure event, and those that triggered in an immature neural network could alter the mature brain physiology. In the present study we observed that the exposure to kainic acid diluted directly in water of zebrafish decreased the locomotor activity at 7 days post-fertilization (dpf) animals and increased at 15 dpf, despite the absence of more specific seizure features. Pre-exposure to kainic acid (500 μM) diluted in water at 7 dpf animals reduced the susceptibility to a second exposure 2 months later by intraperitoneal injection. The current data suggest that these different responses are associated with neuronal maturation process and open a question about the window of development that are crucial to long lasting effects related to seizure in this animal model.
authors.affiliation: Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: Fabiano Peres
authors.initials: FP
authors.lastname: Menezes
authors.affiliation: Programa de Pós-graduação em Bioquímica, Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600-Anexo, 90035-003 Porto Alegre, RS, Brazil; Instituto Nacional de Ciência e Tecnologia em Excitotoxicidade e Neuroproteção (INCT-EN), 90035-003 Porto Alegre, RS, Brazil.
authors.forename: Eduardo Pacheco
authors.initials: EP
authors.lastname: Rico
authors.affiliation: Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil; Instituto Nacional de Ciência e Tecnologia Translacional em Medicina (INCT-TM), 90035-003, Porto Alegre, RS, Brazil. Electronic address: rosane.silva@pucrs.br.
authors.forename: Rosane Souza
authors.initials: RS
authors.lastname: Da Silva
mesh_terms: D000818:Animals; D001921:Brain / Q000187:drug effects* / Q000254:growth & development* / Q000503:physiopathology; D004305:Dose-Response Relationship, Drug; D004361:Drug Tolerance / Q000502:physiology*; D007274:Injections, Intraperitoneal; D007608:Kainic Acid / Q000633:toxicity*; D009043:Motor Activity / Q000187:drug effects / Q000502:physiology; D012640:Seizures / Q000139:chemically induced* / Q000503:physiopathology; D015027:Zebrafish
chemical_list: D007608:Kainic Acid
keywords: Development; Glutamatergic system; Kainic receptors; Zebrafish