Cited by 363Cannabis and Cannabinoid ResearchStress Responses and CortisolMemory and Neural Mechanisms

Downregulation of Endocannabinoid Signaling in the Hippocampus Following Chronic Unpredictable Stress

Hill, Matthew N, Patel, Sachin, Carrier, Erica J, Rademacher, David J, Ormerod, Brandi K, Hillard, Cecilia J, Gorzalka, Boris B·2005·Neuropsychopharmacology

Abstract

Deficits in cognitive functioning and flexibility are seen following both chronic stress and modulation of endogenous cannabinoid (eCB) signaling. Here, we investigated whether alterations in eCB signaling might contribute to the cognitive impairments induced by chronic stress. Chronic stress impaired reversal learning and induced perseveratory behavior in the Morris water maze without significant effect on task acquisition. These cognitive impairments were reversed by exogenous cannabinoid administration, suggesting deficient eCB signaling underlies these phenomena. In line with this hypothesis, chronic stress downregulated CB1 receptor expression and significantly reduced the content of the endocannabinoid 2-arachidonylglycerol within the hippocampus. CB1 receptor density and 2-arachidonylglycerol content were unaffected in the limbic forebrain. These data suggest that stress-induced downregulation of hippocampal eCB signaling contributes to problems in behavioral flexibility and could play a role in the development of perseveratory and ruminatory behaviors in stress-related neuropsychiatric disorders.

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Crossref · 10.1038/sj.npp.1300601

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Authors
Hill, M. N., Patel, S., Carrier, E. J., Rademacher, D. J., Ormerod, B. K., Hillard, C. J., & Gorzalka, B. B.
Affiliations
  • University of British Columbia (CA)
  • Medical College of Wisconsin (US)
Corresponding author
  • Hillard, Cecilia J
  • Gorzalka, Boris B
Venue
Neuropsychopharmacology
Published
2004-11-03
Volume
30
Issue
3
Pages
508-515
ISSN
  • 0893-133X (ISSN-L)
  • 1740-634X
OpenAlex
W2124037107
Cited by
363
References
56
Citations by year
2026: 8 · 2025: 12 · 2024: 16 · 2023: 7 · 2022: 12 · 2021: 29 · 2020: 15 · 2019: 15 · 2018: 11 · 2017: 14 · 2016: 20 · 2015: 21 · 2014: 21 · 2013: 18 · 2012: 20
FWCI
8.15
Type
journal article
Language
en
Open access
closed
Locations
  • Neuropsychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Alliance for Research on Schizophrenia and Depression
  • Michael Smith Health Research BC
  • National Institutes of Health
  • Natural Sciences and Engineering Research Council of Canada
  • National Institute on Drug Abuse (F32 DA-16510, F30 DA15575, R01DA016967, F30DA015575, F32DA016510)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
endocannabinoid signaling, chronic unpredictable mild stress, hippocampus, CB1 receptor, 2-arachidonoylglycerol, reversal learning, behavioral flexibility, perseveration, cognitive impairment, stress-related neuropsychiatric disorders
MeSH terms
Animals, Cannabinoids, Copulation, Female, Hippocampus, Male, Reference Values, Stress, Psychological, Signal Transduction, Maze Learning, Rats, Long-Evans, Receptor, Cannabinoid, CB1, Rats, Cannabinoid Receptor Modulators, Endocannabinoids

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