Cited by 42Cannabis and Cannabinoid ResearchNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Physiological impact of CB1 receptor expression by hippocampal GABAergic interneurons

Albayram, Önder, Passlick, Stefan, Bilkei-Gorzo, Andras, Zimmer, Andreas, Steinhäuser, Christian·2016·Pflügers Archiv - European Journal of Physiology

Abstract

A subset of hippocampal GABAergic neurons, which are cholecystokinin-positive, highly express cannabinoid type 1 (CB1) receptors. Activation of these receptors inhibits GABA release and thereby limits inhibitory control. While genetic deletion of CB1 receptors from GABAergic neurons led to behavioural alterations and neuroinflammatory reactions, it remained unclear whether these changes in the knockout animals were a direct consequence of the enhanced transmitter release or reflected developmental deficits. The hippocampus is vital for the generation of spatial, declarative and working memory. Here, we addressed the question how CB1 receptors in GABAergic neurons influence hippocampal function. Patch clamp and field potential recordings in mice devoid of CB1 receptors in GABAergic neurons revealed an enhanced frequency and faster kinetics of spontaneous inhibitory postsynaptic currents in CA1 pyramidal neurons while tonic inhibition, paired-pulse facilitation and long-term potentiation in the hippocampus were not affected. Evaluation of cognitive functions demonstrated impaired acquisition of spatial memory and deficits in novel object recognition and partner recognition in the knockout mice, while working memory and spatial memory remained intact. The density of GABAergic neurons was also similar in knockout mice and their littermates, which argues against global deficits in hippocampal development. Together, these results suggest that CB1 receptors in GABAergic neurons influence specific aspects of neuronal excitability and hippocampal learning.

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Crossref · 10.1007/s00424-015-1782-5

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Authors
Albayram, Ö., Passlick, S., Bilkei-Gorzo, A., Zimmer, A., & Steinhäuser, C.
Affiliations
University of Bonn (DE)
Corresponding author
Steinhäuser, Christian
Venue
Pflügers Archiv - European Journal of Physiology
Published
2016-01-07
Volume
468
Issue
4
Pages
727-737
ISSN
  • 0031-6768 (ISSN-L)
  • 1432-2013
OpenAlex
W2224409683
Cited by
42
References
58
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 4 · 2022: 3 · 2021: 11 · 2020: 2 · 2019: 1 · 2018: 5 · 2017: 5 · 2016: 3 · 2014: 1
FWCI
3.77
Type
journal article
Language
en
Open access
closed
Locations
  • Pflügers Archiv - European Journal of Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (STE552/3, FOR926 SP2, BI-1227/5-1, FOR926 CP2)
  • Seventh Framework Programme (ESF EuroEPINOMICS)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
CB1 receptor, cholecystokinin, CB1 knockout mice, CA1 pyramidal neurons, inhibitory postsynaptic currents, tonic inhibition, paired-pulse facilitation, long-term potentiation, spatial memory, novel object recognition, partner identification, working memory, neuronal excitability, hippocampal development
MeSH terms
Animals, Cognition, Interneurons, Male, Long-Term Potentiation, Maze Learning, Receptor, Cannabinoid, CB1, Mice, CA1 Region, Hippocampal, GABAergic Neurons

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