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Related Experiment Video

Updated: Aug 7, 2025

Trace Fear Conditioning in Mice

Trace Fear Conditioning in Mice

Published on: March 20, 2014

mGluR5 in amygdala modulates fear memory generalization.

Shou-Min Xuan¹, Ya-Wen Su¹, Yi-Meng Liang¹

¹Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Faculty of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China.

Frontiers in Behavioral Neuroscience

|March 9, 2023

Summary

Fear memory generalization, a PTSD hallmark, is linked to amygdala mGluR5. Inhibiting mGluR5 disrupts fear generalization, suggesting it as a potential PTSD treatment target.

Keywords:

GPCR amygdala fear conditioning generalization mGluR5

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Last Updated: Aug 7, 2025

Trace Fear Conditioning in Mice

Trace Fear Conditioning in Mice

Published on: March 20, 2014

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

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Published on: April 5, 2016

$Combined Optogenetic and Freeze-fracture Replica Immunolabeling to Examine Input-specific Arrangement of Glutamate Receptors in the Mouse Amygdala$

Combined Optogenetic and Freeze-fracture Replica Immunolabeling to Examine Input-specific Arrangement of Glutamate Receptors in the Mouse Amygdala

Published on: April 15, 2016

Area of Science:

Neuroscience
Molecular Biology
Psychiatry

Background:

Fear memory generalization is central to PTSD development.
The precise mechanisms underlying fear memory generalization remain unclear.
Generalization is often viewed as a consolidation mismatch.

Purpose of the Study:

To investigate the role of mGluR5 in the amygdala in fear memory generalization.
To explore potential therapeutic targets for PTSD related to fear generalization.

Main Methods:

Fear conditioning in mice using foot shocks (unconditioned) and tones (conditioned).
Assessed gene expression in the amygdala via immunofluorescence, western blotting, and qPCR.
Utilized cycloheximide (protein synthesis inhibitor) and mGluR5 inhibition.

Main Results:

Strong-shock fear conditioning induced mGluR5 de novo synthesis in the amygdala.
Inhibition of mGluR5 impaired fear memory generalization after strong-shock conditioning.
Conversely, mGluR5 inhibition enhanced generalization following weak-shock training.

Conclusions:

Amygdala mGluR5 plays a critical role in inappropriate fear memory generalization.
mGluR5 inhibition presents a potential therapeutic strategy for PTSD treatment.