Chronic treatment with fluoxetine prevents the return of extinguished auditory-cued conditioned fear.

Abstract:

RATIONALE:We have recently shown that post-extinction exposure of rats to a sub-threshold reminder shock can reactivate extinguished context-related freezing and found that chronic treatment with fluoxetine before fear extinction prevents this phenomenon. OBJECTIVES:In the present study, we examined whether these findings would be confirmed with auditory fear conditioning. METHODS:Rats were initially submitted to a session of five tone-shock pairings with either a 0.7- or 0.1-mA shock and underwent, 3 days later, a session of 20 tone-alone trials. RESULTS:At the beginning of this latter session, we observed cue-conditioned freezing in rats that received the strong, but not the weak, shock. At the end, both groups (strong and weak shocks) displayed similar low levels of freezing, indicating fear extinction in rats exposed to the strong shock. These rats exhibited again high levels of cue-evoked freezing when exposed to three tone-shock pairings with 0.1-mA shock. This reemergence of cue-conditioned fear was completely abolished by chronic (over a 21-day period) fluoxetine treatment which spared, when administered before the initial fear conditioning, the original tone-shock association. CONCLUSIONS:These data extend our previous findings and suggest that chronic fluoxetine treatment favor extinction memory by dampening the reactivation of the original tone-shock association.

journal_title

Psychopharmacology

authors

Deschaux O,Spennato G,Moreau JL,Garcia R

doi

10.1007/s00213-010-2134-y

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

231-7

issue

2

eissn

0033-3158

issn

1432-2072

journal_volume

215

pub_type

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