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Differential roles of the infralimbic and prelimbic areas of the prefrontal cortex in reconsolidation of a traumatic memory.
Eur Neuropsychopharmacol. 2017 09; 27(9):900-912.EN

Abstract

Studies about reconsolidation of conditioned fear memories have shown that pharmacological manipulation at memory reactivation can attenuate or enhance the subsequent expression of the conditioned fear response. Here we examined the effects of a single injection of the mTOR inhibitor rapamycin (Rap) into the infralimbic (IL) and prelimbic (PL) areas [which compose the ventromedial prefrontal cortex (PFC)] on reconsolidation and extinction of a traumatic fear memory. We found opposite effects of Rap infused into the PL and IL on reconsolidation and extinction: intra-PL Rap and systemic Rap impaired reconsolidation and facilitated extinction whereas intra-IL Rap enhanced reconsolidation and impaired extinction. These effects persisted at least 10 days after reactivation. Shock exposure induced anxiety-like behavior and impaired working memory and intra-IL and -PL Rap normalized these effects. Finally, when measured after fear retrieval, shocked rats exhibited reduced and increased phosphorylated p70s6K levels in the IL and basolateral amygdala, respectively. No effect on phosphorylated p70s6K levels was observed in the PL. The study points to the differential roles of the IL and PL in memory reconsolidation and extinction. Moreover, inhibiting mTOR via rapamycin following reactivation of a fear memory may be a novel approach in attenuating enhanced fear memories.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Levin N
Department of Psychology, University of Haifa, Haifa 3498838, Israel.
Kritman M
Sagol Department of Neurobiology, University of Haifa, Haifa 3498838, Israel.
Maroun M
Sagol Department of Neurobiology, University of Haifa, Haifa 3498838, Israel.
Akirav I
Department of Psychology, University of Haifa, Haifa 3498838, Israel. Electronic address: iakirav@psy.haifa.ac.il.

MeSH

AnimalsAnxietyAvoidance LearningBasolateral Nuclear ComplexConditioning, PsychologicalDisease Models, AnimalElectroshockExtinction, PsychologicalFearMaleMemory ConsolidationMemory, Short-TermNootropic AgentsPhosphorylationPrefrontal CortexRats, Sprague-DawleyRibosomal Protein S6 Kinases, 70-kDaSirolimusStress Disorders, Post-TraumaticTOR Serine-Threonine Kinases

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28647452

Citation

Levin, Natali, et al. "Differential Roles of the Infralimbic and Prelimbic Areas of the Prefrontal Cortex in Reconsolidation of a Traumatic Memory." European Neuropsychopharmacology : the Journal of the European College of Neuropsychopharmacology, vol. 27, no. 9, 2017, pp. 900-912.
Levin N, Kritman M, Maroun M, et al. Differential roles of the infralimbic and prelimbic areas of the prefrontal cortex in reconsolidation of a traumatic memory. Eur Neuropsychopharmacol. 2017;27(9):900-912.
Levin, N., Kritman, M., Maroun, M., & Akirav, I. (2017). Differential roles of the infralimbic and prelimbic areas of the prefrontal cortex in reconsolidation of a traumatic memory. European Neuropsychopharmacology : the Journal of the European College of Neuropsychopharmacology, 27(9), 900-912. https://doi.org/10.1016/j.euroneuro.2017.06.007
Levin N, et al. Differential Roles of the Infralimbic and Prelimbic Areas of the Prefrontal Cortex in Reconsolidation of a Traumatic Memory. Eur Neuropsychopharmacol. 2017;27(9):900-912. PubMed PMID: 28647452.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Differential roles of the infralimbic and prelimbic areas of the prefrontal cortex in reconsolidation of a traumatic memory. AU - Levin,Natali, AU - Kritman,Milly, AU - Maroun,Mouna, AU - Akirav,Irit, Y1 - 2017/06/22/ PY - 2017/01/21/received PY - 2017/05/11/revised PY - 2017/06/10/accepted PY - 2017/6/26/pubmed PY - 2018/5/3/medline PY - 2017/6/26/entrez KW - Extinction KW - Inhibitory avoidance KW - Post-traumatic stress disorder (PTSD) KW - Rapamycin SP - 900 EP - 912 JF - European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology JO - Eur Neuropsychopharmacol VL - 27 IS - 9 N2 - Studies about reconsolidation of conditioned fear memories have shown that pharmacological manipulation at memory reactivation can attenuate or enhance the subsequent expression of the conditioned fear response. Here we examined the effects of a single injection of the mTOR inhibitor rapamycin (Rap) into the infralimbic (IL) and prelimbic (PL) areas [which compose the ventromedial prefrontal cortex (PFC)] on reconsolidation and extinction of a traumatic fear memory. We found opposite effects of Rap infused into the PL and IL on reconsolidation and extinction: intra-PL Rap and systemic Rap impaired reconsolidation and facilitated extinction whereas intra-IL Rap enhanced reconsolidation and impaired extinction. These effects persisted at least 10 days after reactivation. Shock exposure induced anxiety-like behavior and impaired working memory and intra-IL and -PL Rap normalized these effects. Finally, when measured after fear retrieval, shocked rats exhibited reduced and increased phosphorylated p70s6K levels in the IL and basolateral amygdala, respectively. No effect on phosphorylated p70s6K levels was observed in the PL. The study points to the differential roles of the IL and PL in memory reconsolidation and extinction. Moreover, inhibiting mTOR via rapamycin following reactivation of a fear memory may be a novel approach in attenuating enhanced fear memories. SN - 1873-7862 UR - https://www.unboundmedicine.com/medline/citation/28647452/Differential_roles_of_the_infralimbic_and_prelimbic_areas_of_the_prefrontal_cortex_in_reconsolidation_of_a_traumatic_memory_ DB - PRIME DP - Unbound Medicine ER -