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Genetic dissection of an amygdala microcircuit that gates conditioned fear

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Haubensak, Wulf, Kunwar, Prabhat S., Cai, Haijiang, Ciocchi, Stephane, Wall, Nicholas R., Ponnusamy, Ravikumar, Biag, Jonathan, Dong, Hong-Wei +5 more·2010·Nature

Abstract

The role of different amygdala nuclei (neuroanatomical subdivisions) in processing Pavlovian conditioned fear has been studied extensively, but the function of the heterogeneous neuronal subtypes within these nuclei remains poorly understood. Here we use molecular genetic approaches to map the functional connectivity of a subpopulation of GABA-containing neurons, located in the lateral subdivision of the central amygdala (CEl), which express protein kinase C-δ (PKC-δ). Channelrhodopsin-2-assisted circuit mapping in amygdala slices and cell-specific viral tracing indicate that PKC-δ(+) neurons inhibit output neurons in the medial central amygdala (CEm), and also make reciprocal inhibitory synapses with PKC-δ(-) neurons in CEl. Electrical silencing of PKC-δ(+) neurons in vivo suggests that they correspond to physiologically identified units that are inhibited by the conditioned stimulus, called CEl(off) units. This correspondence, together with behavioural data, defines an inhibitory microcircuit in CEl that gates CEm output to control the level of conditioned freezing.

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  • The amygdala plays a key role in defensive behaviour and switching between defensive modes in rodents.

    “The amygdala plays a key role in defensive behaviour and switching between defensive modes in rodents [39–42].”

    From Freeze for action: neurobiological mechanisms in animal and human freezing (2017) · cites this paper as [42]

    The Abstract reports that a central-amygdala microcircuit controls conditioned freezing in mice, supporting a role in defensive behaviour. It does not establish that the amygdala switches rodents between different defensive modes; the behaviour studied here is conditioned freezing. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • BLA neurons excite GABAergic CeL neurons that provide feed-forward inhibition onto CeM output neurons.

    “since BLA neurons excite GABAergic CeL neurons26 that provide feed-forward inhibition onto CeM “output” neurons6,18,19”
  • A population of GABAergic neurons in CeL expressing PKC-delta increase spontaneous activity following fear conditioning and are involved in fear generalization and anxiety.

    “For instance, a population of GABAergic neurons in the CeL which express protein kinase C-delta (PKC-delta+ neurons) increase their spontaneous activity following fear conditioning [34], and are involved in fear generalization and anxiety (Fig. 1D) [4].”

    From An emerging circuit pharmacology of GABAA receptors (2018) · cites this paper as [34]

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Authors
Haubensak, W., Kunwar, P. S., Cai, H., Ciocchi, S., Wall, N. R., Ponnusamy, R., Biag, J., Dong, H.-W., Deisseroth, K., Callaway, E. M., Fanselow, M. S., Lüthi, A., & Anderson, D. J.
Affiliations
  • California Institute of Technology (US)
  • Salk Institute for Biological Studies (US)
  • University of California, Los Angeles (US)
  • Stanford University (US)
  • Friedrich Miescher Institute (CH)
Corresponding author
Anderson, David J.
Venue
Nature
Published
2010-11
Volume
468
Issue
7321
Pages
270-276
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1981044491
Cited by
840
References
55
Citations by year
2026: 24 · 2025: 35 · 2024: 50 · 2023: 45 · 2022: 64 · 2021: 62 · 2020: 50 · 2019: 55 · 2018: 84 · 2017: 51 · 2016: 50 · 2015: 68 · 2014: 50 · 2013: 58 · 2012: 46
FWCI
29.09
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Institute of Mental Health (R01MH063912, R01MH085082)
  • National Institute of Neurological Disorders and Stroke (RC2NS069464)
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 › Neurobiology and Insect Physiology Research
Keywords
central amygdala, fear conditioning, protein kinase C delta, GABAergic neurons, inhibitory microcircuits, disinhibition, conditioned freezing, fear memory, neuronal cell types
MeSH terms
Amygdala, Animals, Axonal Transport, Cells, Cultured, Conditioning, Classical, Fear, Female, gamma-Aminobutyric Acid, Genetic Techniques, Humans, Male, Mice, Transgenic, Neural Inhibition, Neural Pathways, Neurons, Synapses, Freezing Reaction, Cataleptic, Mice, Protein Kinase C-delta

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