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Title: Long-term decrease in immediate early gene expression after electroconvulsive seizures
Authors: Calais, Julien Braga
Valvassori, Samira S.
Resende, Wilson R.
Feier, Gustavo
Athie, Maria Carolina Pedro
Ribeiro, Sidarta
Gattaz, Wagner Farid
Quevedo, João
Ojopi, Elida Benquique
Keywords: Arc;Egr1;Electroconvulsive seizures;Fos;Memory
Issue Date: 9-Aug-2012
Portuguese Abstract: Electroconvulsive therapy (ECT) is a wellestablished psychiatric treatment for severe depression. Despite its clinical utility, post-ECT memory deficits are a common side effect. Neuronal plasticity and memory consolidation are intimately related to the expression of immediate early genes (IEG), such as Egr1, Fos and Arc. Changes in IEG activation have been postulated to underlie long-term neuronal adaptations following electroconvulsive seizures (ECS), an animal model of ECT. To test this hypothesis, we used real-time PCR to examine the effect of acute and chronic ECS (8 sessions, one every other day) on the long-term ([24 h) expression of IEG Egr1, Fos and Arc in the hippocampus, a brain region implicated both in the pathophysiology of depression as well as in memory function. We observed a transient increase in Egr1 and Fos expression immediately after ECS, followed by a long-term decrease of IEGlevels after both acute and chronic ECS.Aseparate group of animals, submitted to the same chronic ECS protocol and then subjected to open field or passive avoidance tasks, confirmed robust memory deficits 2 weeks after the last chronic ECS. The possible role of IEG downregulation on long-term learning deficits observed following ECS are discussed.
ISSN: 0300-9564
Appears in Collections:ICe - Artigos publicados em periódicos

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