Cited by 153Cannabis and Cannabinoid ResearchNeuroscience and Neuropharmacology ResearchStress Responses and Cortisol

Repeated homotypic stress elevates 2-arachidonoylglycerol levels and enhances short-term endocannabinoid signaling at inhibitory synapses in basolateral amygdala

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Patel, Sachin, Kingsley, Philip J, Mackie, Ken, Marnett, Lawrence J, Winder, Danny G·2009·Neuropsychopharmacology

Abstract

Psychosocial stress is a risk factor for development and exacerbation of neuropsychiatric illness. Repeated stress causes biochemical adaptations in endocannabinoid (eCB) signaling that contribute to stress-response habituation, however, the synaptic correlates of these adaptations have not been examined. Here, we show that the synthetic enzyme for the eCB 2-arachidonoylglycerol (2-AG), diacylglycerol (DAG) lipase alpha, is heterogeneously expressed in the amygdala, and that levels of 2-AG and precursor DAGs are increased in the basolateral amygdala (BLA) after 10 days, but not 1 day, of restraint stress. In contrast, arachidonic acid was decreased after both 1 and 10 days of restraint stress. To examine the synaptic correlates of these alterations in 2-AG metabolism, we used whole-cell electrophysiology to determine the effects of restraint stress on depolarization-induced suppression of inhibition (DSI) in the BLA. A single restraint stress exposure did not alter DSI compared with control mice. However, after 10 days of restraint stress, DSI duration, but not magnitude, was significantly prolonged. Inhibition of 2-AG degradation with MAFP also prolonged DSI duration; the effects of repeated restraint stress and MAFP were mutually occlusive. These data indicate that exposure to repeated, but not acute, stress produces neuroadaptations that confer BLA neurons with an enhanced capacity to elevate 2-AG content and engage in 2-AG-mediated short-term retrograde synaptic signaling. We suggest stress-induced enhancement of eCB-mediated suppression of inhibitory transmission in the BLA could contribute to affective dysregulation associated with chronic stress.

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Crossref · 10.1038/npp.2009.101

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  • Stress produces divergent effects on AEA and 2-AG levels in the BLA, with an elevation in 2-AG levels and a rapid induction of FAAH activity and resultant decline in the AEA pool following exposure to various types of stress.

    “Interestingly, stress appears to produce divergent effects on AEA and 2-AG levels in the BLA – with an elevation in 2-AG levels [57], but a rapid induction of FAAH activity and a resultant decline in the pool of AEA [58–60] were reported following exposure to various types of stress.”

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Authors
Patel, S., Kingsley, P. J., Mackie, K., Marnett, L. J., & Winder, D. G.
Affiliations
  • Vanderbilt University (US)
  • Indiana University Bloomington (US)
Corresponding author
Patel, Sachin
Venue
Neuropsychopharmacology
Published
2009-08-12
Volume
34
Issue
13
Pages
2699-2709
ISSN
  • 0893-133X (ISSN-L)
  • 1740-634X
OpenAlex
W1963850092
Cited by
153
References
41
Citations by year
2026: 6 · 2025: 5 · 2024: 2 · 2023: 4 · 2022: 11 · 2021: 9 · 2020: 9 · 2019: 9 · 2018: 8 · 2017: 7 · 2016: 15 · 2015: 13 · 2014: 14 · 2013: 11 · 2012: 10
FWCI
7.19
Type
journal article
Language
en
Open access
Locations
  • Neuropsychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Vanderbilt University
  • Vanderbilt Institute for Clinical and Translational Research
  • National Institutes of Health (GM 15431)
  • National Institute on Alcohol Abuse and Alcoholism (AA15635, U01AA015635)
  • National Institute on Drug Abuse (DA21696, DA11322, DA 19112, R01DA011322, R01DA019112, K05DA021696)
  • National Institute of General Medical Sciences (GM 15431, P50GM015431, P01GM015431)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
repeated restraint stress, 2-arachidonoylglycerol, endocannabinoid signaling, basolateral amygdala, diacylglycerol lipase alpha, diacylglycerol, arachidonic acid, depolarization-induced suppression of inhibition, inhibitory synapses, chronic stress, emotional dysregulation
MeSH terms
Amygdala, Animals, Arachidonic Acids, Diglycerides, Glycerides, Lipoprotein Lipase, Male, Mice, Inbred ICR, Morpholines, Naphthalenes, Neural Inhibition, Synaptic Transmission, Restraint, Physical, Stress, Physiological, Stress, Psychological, Synapses, Receptor, Cannabinoid, CB1, Benzoxazines, Mice, Inhibitory Postsynaptic Potentials, Organophosphonates, Cannabinoid Receptor Modulators, Endocannabinoids

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