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Related Experiment Video

Updated: Jun 20, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Published on: April 5, 2016

Neuropeptides modulate compound postsynaptic potentials in basolateral amygdala.

L Chung¹, S D Moore

¹Department of Psychiatry, Duke University Medical Center, Durham, NC 27710, USA.

|September 30, 2009

Summary

This summary is machine-generated.

The anxiogenic neuropeptide cholecystokinin (CCK) induces synchronized rhythmic activity in the amygdala. This activity, characterized by compound postsynaptic potentials (cPSPs), is modulated by various neurotransmitters and receptor antagonists, suggesting complex neural network involvement in fear and anxiety.

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Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

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

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Stereotaxic Surgery for Excitotoxic Lesion of Specific Brain Areas in the Adult Rat

Stereotaxic Surgery for Excitotoxic Lesion of Specific Brain Areas in the Adult Rat

Published on: July 19, 2012

Area of Science:

Neuroscience
Molecular Biology
Behavioral Science

Background:

Neuropeptides in the amygdala influence fear and anxiety.
Cholecystokinin (CCK) increases inhibitory neurotransmission in the basolateral amygdala.
CCK induces synchronized rhythmic activity, termed compound postsynaptic potentials (cPSPs).

Purpose of the Study:

Further characterize CCK-induced cPSPs in rat brain slices.
Investigate the neurochemical and cellular mechanisms underlying cPSP generation.
Explore the role of different neuropeptides and receptor systems in modulating cPSPs.

Main Methods:

Electrophysiological recordings in rat brain slices.
Pharmacological manipulation using receptor antagonists and blockers.
Dose-dependent application of neuropeptides and drugs.

Main Results:

CCK dose-dependently facilitated cPSP occurrence in both young and mature rats.
cPSPs were attenuated by glutamate receptor antagonists (NBQX, DL-AP5) and GABA(A) receptor antagonists (bicuculline methiodide, SR95531, picrotoxin).
Anxiogenic (CRF) and anxiolytic (NPY, somatostatin) neuropeptides differentially modulated cPSPs, as did diazepam and mefloquine.

Conclusions:

cPSPs are likely generated by a positive feedback loop between interneurons and glutamatergic projection neurons in the amygdala.
These findings provide insights into the neural circuitry underlying fear and anxiety states.
The study highlights the role of CCK and other neuromodulators in regulating amygdala network activity.