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Dissociable Roles of Prelimbic and Infralimbic Cortices, Ventral Hippocampus, and Basolateral Amygdala in the Expression and Extinction of Conditioned Fear

Neuropsychopharmacology (New York, N.Y.), 2011-01, Vol.36 (2), p.529-538 [Peer Reviewed Journal]

2015 INIST-CNRS ;Copyright Nature Publishing Group Jan 2011 ;Copyright © 2011 American College of Neuropsychopharmacology 2011 American College of Neuropsychopharmacology ;ISSN: 0893-133X ;EISSN: 1740-634X ;DOI: 10.1038/npp.2010.184 ;PMID: 20962768 ;CODEN: NEROEW

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Title:
Dissociable Roles of Prelimbic and Infralimbic Cortices, Ventral Hippocampus, and Basolateral Amygdala in the Expression and Extinction of Conditioned Fear
Author: SIERRA-MERCADO, Demetrio ; PADILLA-COREANO, Nancy ; QUIRK, Gregory J
Subjects: Amygdala - drug effects ; Amygdala - physiology ; Animals ; Biological and medical sciences ; CA1 Region, Hippocampal - drug effects ; CA1 Region, Hippocampal - physiology ; Conditioning, Operant - drug effects ; Conditioning, Operant - physiology ; Extinction, Psychological - drug effects ; Extinction, Psychological - physiology ; Fear - drug effects ; Fear - physiology ; Male ; Medical sciences ; Original ; Prefrontal Cortex - drug effects ; Prefrontal Cortex - physiology ; Rats ; Rats, Sprague-Dawley
Is Part Of: Neuropsychopharmacology (New York, N.Y.), 2011-01, Vol.36 (2), p.529-538
Description: Current models of conditioned fear expression and extinction involve the basolateral amygdala (BLA), ventral medial prefrontal cortex (vmPFC), and the hippocampus (HPC). There is some disagreement with respect to the specific roles of these structures, perhaps due to subregional differences within each area. For example, growing evidence suggests that infralimbic (IL) and prelimbic (PL) subregions of vmPFC have opposite influences on fear expression. Moreover, it is the ventral HPC (vHPC), rather than the dorsal HPC, that projects to vmPFC and BLA. To help determine regional specificity, we used small doses of the GABA(A) agonist muscimol to selectively inactivate IL, PL, BLA, or vHPC in an auditory fear conditioning and extinction paradigm. Infusions were performed prior to extinction training, allowing us to assess the effects on both fear expression and subsequent extinction memory. Inactivation of IL had no effect on fear expression, but impaired the within-session acquisition of extinction as well as extinction memory. In contrast, inactivation of PL impaired fear expression, but had no effect on extinction memory. Inactivation of the BLA or vHPC impaired both fear expression and extinction memory. Post-extinction inactivations had no effect in any structure. We suggest a model in which amygdala-dependent fear expression is modulated by inputs from PL and vHPC, whereas extinction memory requires extinction-induced plasticity in IL, BLA, and/or vHPC.
Publisher: Basingstoke: Nature Publishing Group
Language: English
Identifier: ISSN: 0893-133X
EISSN: 1740-634X
DOI: 10.1038/npp.2010.184
PMID: 20962768
CODEN: NEROEW
Source: ProQuest One Psychology
Geneva Foundation Free Medical Journals at publisher websites
MEDLINE
PubMed Central
ProQuest Central

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Dissociable Roles of Prelimbic and Infralimbic Cortices, Ventral Hippocampus, and Basolateral Amygdala in the Expression and Extinction of Conditioned Fear

2015 INIST-CNRS ;Copyright Nature Publishing Group Jan 2011 ;Copyright © 2011 American College of Neuropsychopharmacology 2011 American College of Neuropsychopharmacology ;ISSN: 0893-133X ;EISSN: 1740-634X ;DOI: 10.1038/npp.2010.184 ;PMID: 20962768 ;CODEN: NEROEW

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