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Cannabinoids disrupt hippocampal sharp wave-ripples via inhibition of glutamate release

Item Type:Article
Title:Cannabinoids disrupt hippocampal sharp wave-ripples via inhibition of glutamate release
Creators Name:Maier, N. and Morris, G. and Schuchmann, S. and Korotkova, T. and Ponomarenko, A. and Boehm, C. and Wozny, C. and Schmitz, D.
Abstract:Cannabis consumption results in impaired learning. The proper synchronization of neuronal activity in the mammalian hippocampus gives rise to network rhythms that are implicated in memory formation. Here, we have studied the impact of cannabinoids on hippocampal sharp waves and associated ripple oscillations using field- and whole-cell voltage-clamp recordings. We demonstrate that the activation of cannabinoid receptor 1 suppresses sharp wave-ripples (SWRs) in mice in vivo and in vitro. This suppression was paralleled by a selective reduction of SWR-associated inward but not outward charge transfer, demonstrating an impairment of excitation due to cannabinoid exposure. Adenosine, a presynaptic modulator of glutamate release, mimicked and occluded the observed consequences of cannabinoids on SWRs. We conclude that inhibition of glutamatergic feed-forward excitation can explain cannabinoid-mediated disruption of SWRs and may account for cannabinoid-induced impairment of hippocampus-dependent memory.
Keywords:Hippocampus, Rhythm, Oscillation, Neuromodulation, Cannabinoids, Animals, Mice
Source:Hippocampus
ISSN:1050-9631
Publisher:Wiley (U.S.A.)
Volume:22
Number:6
Page Range:1350-1362
Date:June 2012
Official Publication:https://doi.org/10.1002/hipo.20971
PubMed:View item in PubMed

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