Cited by 60Memory and Neural MechanismsNeuroscience and Neuropharmacology ResearchNeurotransmitter Receptor Influence on Behavior

Functional connectivity of the main intercalated nucleus of the mouse amygdala

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Mańko, Mirosława, Geracitano, Raffaella, Capogna, Marco·2011·The Journal of Physiology

Abstract

Intercalated cells (ITCs) of the amygdala are clusters of GABAergic cells that surround the basolateral complex of the amygdala (BLA). Growing evidence suggests that ITCs are required for the expression of fear extinction. The main intercalated nucleus (Im) is the largest of the ITC clusters and could also be important for emotional processing. We used whole-cell recordings from Im neurons in acute slices of mouse amygdala. We found that these neurons were medium-sized spiny projection cells. Their passive and active membrane responses were consistent with those previously reported in other ITC clusters. The axon of Im neurons was, in many cases, cut at the slice boundaries, suggesting long-range projections. Axonal branches could be detected in several amygdala nuclei where they made functional synapses. We also functionally studied Im cell inputs. Excitatory postsynaptic currents (eEPSCs) were evoked by the stimulation of the Im, intermediate capsula (IC), external capsula (EC) or BLA, when GABAergic transmission was pharmacologically blocked. An occlusion test indicated that fibres recruited by stimulating Im and IC, or Im and EC were distinct. These eEPSCs had both NMDA and AMPA receptor components. Inhibitory postsynaptic currents (eIPSCs) were evoked after the stimulation of the Im, the EC and the BLA, when glutamatergic transmission was pharmacologically blocked. Furthermore, dopamine reversibly hyperpolarised, and decreased the firing frequency and the input resistance of Im cells via dopamine type 1 receptor. Our data suggest that the Im is functionally connected to other amygdala nuclei and is under neuromodulatory influence. We propose that the Im serves as key neuronal substrate of fear extinction.

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Crossref · 10.1113/jphysiol.2010.201475

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Authors
Mańko, M., Geracitano, R., & Capogna, M.
Venue
The Journal of Physiology
Publisher
Wiley
Published
2011-04
Volume
589
Issue
8
Pages
1911-1925
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2159833032
Cited by
60
References
49
Citations by year
2026: 1 · 2024: 5 · 2023: 3 · 2022: 6 · 2021: 6 · 2020: 2 · 2019: 1 · 2018: 5 · 2017: 1 · 2016: 4 · 2015: 6 · 2014: 5 · 2013: 4 · 2012: 9
FWCI
3.24
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Medical Research Council
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
amygdala, intercalated cells, fear extinction, basolateral amygdala, GABAergic neurons, axonal projections, excitatory postsynaptic currents, inhibitory postsynaptic currents, dopamine D1 receptor, neuromodulation, mice
MeSH terms
Amygdala, Analysis of Variance, Animals, Behavior, Animal, Dopamine, Electric Stimulation, Extinction, Psychological, Fear, gamma-Aminobutyric Acid, Interneurons, Kinetics, Memory, Mice, Inbred C57BL, Neural Pathways, Receptors, N-Methyl-D-Aspartate, Receptors, Dopamine D1, Receptors, AMPA, Neurotransmitter Agents, Patch-Clamp Techniques, Glutamic Acid, Excitatory Postsynaptic Potentials, Mice, Inhibitory Postsynaptic Potentials, In Vitro Techniques

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