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(Reference retrieved automatically from Google Scholar through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of acute and chronic fluoxetine treatments on restraint stress-induced Fos expression

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Author(s):
Lino-de-Oliveira‚ C. ; Sales‚ A.J. ; Aparecida Del Bel‚ E. ; Silveira‚ M.C.L. ; Guimarães‚ F.S.
Total Authors: 5
Document type: Journal article
Source: Brain Research Bulletin; v. 55, n. 6, p. 747-754, 2001.
Abstract

Chronic treatment with antidepressants has been shown to attenuate behavioral changes induced by uncontrollable stress. The mechanisms and brain sites of this effect, however, remain controversial. The objective of the present work was to investigate the effects of chronic and acute treatment with fluoxetine (FLX), a selective serotonin reuptake blocker, on Fos expression in animals submitted to restraint stress. Male Wistar rats (n = 3-9/group) received, during 1 or 21 days, intraperitoneal. Injections of vehicle (saline + 0.2% Tween-80, 1 ml/kg) or FLX (10 mg/kg). One hour after the last injection they were forced restrained for 2 h and sacrificed immediately after. Non-stressed animals were sacrificed 2 h after the last injection. The brains were removed and processed for immunohistochemistry. Fos-like immunoreactivity (FLI) was quantified by a computer system. In acutely treated animals FLX decreased stress-induced FLI in the medial amygdala (MeA), bed nucleus of the stria terminalis (BNST), ventrolateral part, and dorsolateral periaqueductal gray (PAG). After chronic treatment, however, the drug induced a significant increase in FLI in the BNST (ventrolateral and medial parts), lateral septal nucleus (LSN, dorsal part), dorsal raphe nucleus (DRN), and locus coeruleus in restrained group. In non-restrained animals chronic treatment with FLX increased FLI in the MeA, BNST (ventrolateral and dorsolateral parts), LSN (dorsal and intermediate parts), dorsolateral and dorsomedial PAG and in the DRN. The results suggest that chronic fluoxetine treatment induce plastic changes that result in a different regional pattern of Fos expression. (C) 2001 Elsevier Science Inc. (AU)

FAPESP's process: 98/10639-7 - Neurobiology of Behavioral responses to aversive events
Grantee:Francisco Silveira Guimaraes
Support Opportunities: Research Projects - Thematic Grants