Cited by 65Cannabis and Cannabinoid ResearchStress Responses and CortisolTreatment of Major Depression

Upregulation of CB1 receptor binding in the ventromedial prefrontal cortex promotes proactive stress-coping strategies following chronic stress exposure

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McLaughlin, R.J., Hill, M.N., Dang, S.S., Wainwright, S.R., Galea, L.A.M., Hillard, C.J., Gorzalka, B.B.·2013·Behavioural Brain Research

Abstract

Accumulating evidence has revealed that dysregulation of the endocannabinoid system could contribute to the development of major depression. Studies carried out post-mortem in depressed suicide victims have revealed increased CB(1) receptor binding site density in the prefrontal cortex (PFC). Accordingly, exposure of rodents to chronic unpredictable stress (CUS) results in phenotypic changes that mirror those of human depression, including increased CB(1) receptor binding site density in the PFC. Our goal in these studies was to examine the effects of CUS on the density of CB(1) receptor binding sites in the rodent medial PFC and to explore the role of this alteration in the behavioral changes invoked by CUS. Rodents exposed to CUS exhibited increased CB(1) receptor maximal binding site density (B(max)) within the ventromedial PFC, but not the dorsomedial PFC. To determine whether this change in the ventromedial PFC is an adaptive response, or alternatively, a consequence of chronic stress that contributes to the adoption of passive coping, we examined whether local CB(1) receptor blockade within the ventromedial PFC following CUS would significantly alter behaviors in the forced swim test (FST). CUS exposure significantly increased passive coping in the FST, and this was further augmented by discrete ventromedial PFC microinfusions of the CB(1) receptor antagonist AM251 prior to swim stress. Moreover, local CB(1) receptor blockade reduced active coping responses in CUS-exposed rats. These findings suggest that the increase in CB(1) receptor B(max) observed in the ventromedial PFC of rodents exposed to CUS maintains proactive coping strategies following chronic stress exposure.

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Authors
McLaughlin, R. J., Hill, M. N., Dang, S. S., Wainwright, S. R., Galea, L. A. M., Hillard, C. J., & Gorzalka, B. B.
Affiliations
  • University of British Columbia (CA)
  • University of Calgary (CA)
  • Medical College of Wisconsin (US)
Corresponding author
McLaughlin, R.J.
Venue
Behavioural Brain Research
Publisher
Elsevier BV
Published
2013-01
Volume
237
Pages
333-337
ISSN
0166-4328 (ISSN-L)
OpenAlex
W2039316705
Cited by
65
References
35
Citations by year
2026: 2 · 2025: 3 · 2024: 4 · 2023: 3 · 2022: 4 · 2021: 7 · 2020: 8 · 2019: 1 · 2018: 7 · 2017: 5 · 2016: 3 · 2015: 8 · 2014: 7 · 2013: 2 · 2012: 1
FWCI
4.23
Type
journal article
Language
en
Open access
Locations
  • Behavioural Brain Research (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Canadian Institutes of Health Research (CIHR)
  • National Institutes of Health (DA026996)
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
Keywords
CB1 receptor, endocannabinoid system, ventromedial prefrontal cortex, chronic unpredictable mild stress, proactive coping, passive coping, forced swim test, AM251, major depressive disorder, receptor binding density
MeSH terms
Adaptation, Psychological, Analgesics, Animals, Cues, Cyclohexanols, Disease Models, Animal, Male, Protein Binding, Stress, Psychological, Swimming, Tritium, Up-Regulation, Rats, Sprague-Dawley, Prefrontal Cortex, Receptor, Cannabinoid, CB1, Rats

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