What question did this study set out to answer?

To evaluate how an extinction-restraint intervention prevents fear relapse by modulating basolateral amygdala engram cells and locus coeruleus circuit mechanisms.

August 14, 2026Experimental & Molecular MedicineOpen Access

Extinction-restraint intervention eradicates fear memory encoded in BLA engram cells via D2 receptor-mediated dopaminergic modulation from locus coeruleus

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Authors

TLTongxia Li JYJian Yang CCChi Cui

Discussion

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Overview

Experimental study demonstrates that extinction-restraint prevents fear relapse via locus coeruleus dopamine D2 modulation of amygdala engrams, highlighting novel PTSD therapy targets.

Key Points

To evaluate how an extinction-restraint intervention prevents fear relapse by modulating basolateral amygdala engram cells and locus coeruleus circuit mechanisms.
Assessed an extinction-restraint (Ext-Res) protocol in an experimental model of PTSD-associated fear relapse.
Mapped and manipulated the neural projection from tyrosine hydroxylase-positive locus coeruleus neurons (LC_TH) to basolateral amygdala engram cells (BLA_engram).
Investigated the selective roles of dopamine, norepinephrine, and dopamine D2 receptor signaling in engram reactivation and fear suppression.
Reactivation of BLA engram cells induced fear relapse following standard extinction, whereas Ext-Res intervention effectively prevented fear relapse and deconditioned engrams.
Dopamine release, but not norepinephrine, from LC_TH projections to the BLA was necessary to deactivate fear engram cells following Ext-Res.
Pharmacological and circuit-level manipulation of dopamine D2 receptors in the LC-BLA pathway replicated or reversed the therapeutic benefits of Ext-Res.

Cite This Study

Li et al. (2026) studied this question.

synapsesocial.com/papers/6a7ec78db70b84ec8b91404a https://doi.org/10.1038/s12276-026-01794-0

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August 14, 2026Experimental & Molecular MedicineOpen Access

Extinction-restraint intervention eradicates fear memory encoded in BLA engram cells via D2 receptor-mediated dopaminergic modulation from locus coeruleus

View Full Paper

Ask AI

Bookmark

Authors

TLTongxia Li JYJian Yang CCChi Cui

Discussion

Member takes

Overview

Experimental study demonstrates that extinction-restraint prevents fear relapse via locus coeruleus dopamine D2 modulation of amygdala engrams, highlighting novel PTSD therapy targets.

Key Points

To evaluate how an extinction-restraint intervention prevents fear relapse by modulating basolateral amygdala engram cells and locus coeruleus circuit mechanisms.
Assessed an extinction-restraint (Ext-Res) protocol in an experimental model of PTSD-associated fear relapse.
Mapped and manipulated the neural projection from tyrosine hydroxylase-positive locus coeruleus neurons (LC_TH) to basolateral amygdala engram cells (BLA_engram).
Investigated the selective roles of dopamine, norepinephrine, and dopamine D2 receptor signaling in engram reactivation and fear suppression.
Reactivation of BLA engram cells induced fear relapse following standard extinction, whereas Ext-Res intervention effectively prevented fear relapse and deconditioned engrams.
Dopamine release, but not norepinephrine, from LC_TH projections to the BLA was necessary to deactivate fear engram cells following Ext-Res.
Pharmacological and circuit-level manipulation of dopamine D2 receptors in the LC-BLA pathway replicated or reversed the therapeutic benefits of Ext-Res.

Cite This Study

Li et al. (2026) studied this question.

synapsesocial.com/papers/6a7ec78db70b84ec8b91404a https://doi.org/10.1038/s12276-026-01794-0

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