Cited by 169Cannabis and Cannabinoid ResearchStress Responses and CortisolNeuroscience and Neuropharmacology Research

Anxiety, stress, and fear response in mice with reduced endocannabinoid levels

Jenniches, Imke, Ternes, Svenja, Albayram, Onder, Otte, David M., Bach, Karsten, Bindila, Laura, Michel, Kerstin, Lutz, Beat +2 more·2016·Biological Psychiatry

Abstract

Background Disruption of the endocannabinoid system through pharmacological or genetic invalidation of cannabinoid CB1 receptors has been linked to depression in humans and depression-like behaviors in mice. The two main endogenous cannabinoids, anandamide and 2-arachidonoyl glycerol (2-AG), are produced on demand from phospholipids. The pathways and enzymes involved in endocannabinoid biosynthesis thus play a major role in regulating the activity of this system. This study investigates the role of the main 2-AG producing enzyme diacylglycerol lipase α (DAGL-α).Methods We generated and used knockout mice lacking DAGL-α (Dagla(-/-)) to assess the behavioral consequences of reduced endocannabinoid levels in the brain. We performed different behavior tests to determine anxiety- and depression-related behavioral changes in Dagla(-/-) mice. We also analyzed expression of genes related to the endocannabinoid system via real-time polymerase chain reaction and used the mitotic marker 5-bromo-2'-deoxyuridine to analyze adult neurogenesis.Results Dagla(-/-) animals show an 80% reduction of brain 2-AG levels but also a reduction in cortical and amygdalar anandamide. The behavioral changes induced by Dagla deletion include a reduced exploration of the central area of the open field, a maternal neglect behavior, a fear extinction deficit, increased behavioral despair, increased anxiety-related behaviors in the light/dark box, and reduced hippocampal neurogenesis. Some of these behavioral changes resemble those observed in animals lacking the CB1 receptor.Conclusions Our findings demonstrate that the deletion of Dagla adversely affects the emotional state of animals and results in enhanced anxiety, stress, and fear responses.

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Crossref · 10.1016/j.biopsych.2015.03.033

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Authors
Jenniches, I., Ternes, S., Albayram, O., Otte, D. M., Bach, K., Bindila, L., Michel, K., Lutz, B., Bilkei-Gorzo, A., & Zimmer, A.
Affiliations
  • University of Bonn (DE)
  • University Medical Center of the Johannes Gutenberg University Mainz (DE)
Corresponding author
Zimmer, Andreas
Venue
Biological Psychiatry
Publisher
Elsevier BV
Published
2016-05
Volume
79
Issue
10
Pages
858-868
ISSN
0006-3223 (ISSN-L)
OpenAlex
W2041094930
Cited by
169
References
44
Citations by year
2026: 7 · 2025: 9 · 2024: 12 · 2023: 11 · 2022: 20 · 2021: 27 · 2020: 17 · 2019: 12 · 2018: 11 · 2017: 17 · 2016: 18 · 2015: 7
FWCI
12.73
Type
journal article
Language
en
Open access
closed
Locations
  • Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
endocannabinoid system, diacylglycerol lipase alpha, 2-arachidonoylglycerol, anandamide, CB1 receptor, anxiety, depression-like behavior, fear extinction, maternal neglect, hippocampal neurogenesis, stress response, amygdala, open field exploration, behavioral despair
MeSH terms
Animals, Anxiety, Brain, Exploratory Behavior, Extinction, Psychological, Fear, Female, Lipoprotein Lipase, Male, Maternal Behavior, Mice, Inbred C57BL, Motor Activity, Social Behavior, Stress, Psychological, Cohort Studies, Mice, Knockout, Neurogenesis, Endocannabinoids

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