Cited by 69Memory and Neural MechanismsNeuroscience and Neuropharmacology ResearchRegulation of Appetite and Obesity

Hunger promotes fear extinction by activation of an amygdala microcircuit

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Verma, Dilip, Wood, James, Lach, Gilliard, Herzog, Herbert, Sperk, Guenther, Tasan, Ramon·2016·Neuropsychopharmacology

Abstract

Emotions control evolutionarily-conserved behavior that is central to survival in a natural environment. Imbalance within emotional circuitries, however, may result in malfunction and manifestation of anxiety disorders. Thus, a better understanding of emotional processes and, in particular, the interaction of the networks involved is of considerable clinical relevance. Although neurobiological substrates of emotionally controlled circuitries are increasingly evident, their mutual influences are not. To investigate interactions between hunger and fear, we performed Pavlovian fear conditioning in fasted wild-type mice and in mice with genetic modification of a feeding-related gene. Furthermore, we analyzed in these mice the electrophysiological microcircuits underlying fear extinction. Short-term fasting before fear acquisition specifically impaired long-term fear memory, whereas fasting before fear extinction facilitated extinction learning. Furthermore, genetic deletion of the Y4 receptor reduced appetite and completely impaired fear extinction, a phenomenon that was rescued by fasting. A marked increase in feed-forward inhibition between the basolateral and central amygdala has been proposed as a synaptic correlate of fear extinction and involves activation of the medial intercalated cells. This form of plasticity was lost in Y4KO mice. Fasting before extinction learning, however, resulted in specific activation of the medial intercalated neurons and re-established the enhancement of feed-forward inhibition in this amygdala microcircuit of Y4KO mice. Hence, consolidation of fear and extinction memories is differentially regulated by hunger, suggesting that fasting and modification of feeding-related genes could augment the effectiveness of exposure therapy and provide novel drug targets for treatment of anxiety disorders.

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  • The Y4 receptor, which is mainly activated by peripheral PP, modulates anxiety and fear-related disorders in rodents.

    “The Y 4 receptor, which is mainly activated by peripheral PP, modulates anxiety and fear-related disorders in rodents [174,185,186].”

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Authors
Verma, D., Wood, J., Lach, G., Herzog, H., Sperk, G., & Tasan, R.
Affiliations
  • Innsbruck Medical University (AT)
  • Ministry of Education (BR)
  • Garvan Institute of Medical Research (AU)
Corresponding author
Tasan, Ramon
Venue
Neuropsychopharmacology
Published
2015-06-11
Volume
41
Issue
2
Pages
431-439
ISSN
  • 0893-133X (ISSN-L)
  • 1740-634X
OpenAlex
W1608810417
Cited by
69
References
52
Citations by year
2025: 11 · 2024: 4 · 2023: 7 · 2022: 2 · 2021: 7 · 2020: 9 · 2019: 8 · 2018: 7 · 2017: 6 · 2016: 4 · 2015: 4
FWCI
4.21
Type
journal article
Language
en
Open access
Locations
  • Neuropsychopharmacology (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
Austrian Science Fund (P22830)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
hunger, fear extinction, fasting, feedforward inhibition, basolateral amygdala, central amygdala, Y4 receptor, appetite, fear memory consolidation, anxiety disorders, exposure therapy, fear conditioning
MeSH terms
Amygdala, Animals, Appetite, Conditioning, Psychological, Extinction, Psychological, Fear, Food Deprivation, Hunger, Immunohistochemistry, Male, Memory, Short-Term, Mice, Inbred C57BL, Neural Inhibition, Neurons, Mental Recall, Receptors, Neuropeptide Y, Mice, Knockout, Tissue Culture Techniques, Memory, Long-Term

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