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

被引:921
作者
Sierra-Mercado, Demetrio
Padilla-Coreano, Nancy
Quirk, Gregory J. [1 ]
机构
[1] Univ Puerto Rico, Sch Med, Dept Psychiat, San Juan, PR 00936 USA
关键词
rat; inactivation; prefrontal cortex; conditioning; muscimol; GABA(A); MEDIAL PREFRONTAL CORTEX; NMDA RECEPTORS; RELEARNING EXTINCTION; SYNAPTIC PLASTICITY; NEURONS; MEMORY; CONSOLIDATION; RAT; INACTIVATION; ACQUISITION;
D O I
10.1038/npp.2010.184
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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. Neuropsychopharmacology (2011) 36, 529-538; doi:10.1038/npp.2010.184; published online 20 October 2010
引用
收藏
页码:529 / 538
页数:10
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