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PGE2 glycerol ester, a COX‐2 oxidative metabolite of 2‐arachidonoyl glycerol, modulates inhibitory synaptic transmission in mouse hippocampal neurons

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Sang, Nan, Zhang, Jian, Chen, Chu·2006·The Journal of Physiology

Abstract

The oxygenation of endogenous cannabinoids (eCBs) 2-arachidonoyl glycerol (2-AG) and arachidonoyl ethanolamide by cyclooxygenase-2 (COX-2) produces novel types of prostanoids: prostaglandin glycerol esters (PG-Gs) and prostaglandin ethanolamides (PG-EAs). However, the physiological function of COX-2 oxidative metabolites of eCBs is still unclear. Here we demonstrate that PGE2-G, a COX-2 oxidative metabolite of 2-AG, induced a concentration-dependent increase in the frequency ofminiature inhibitory postsynaptic currents (mIPSCs) in primary cultured hippocampal neurons, an effect opposite to that of 2-AG. This increase was not inhibited by SR141716, a CB1 receptor antagonist, but was attenuated by an IP3 or MAPK inhibitor. In addition, we also examined the effects of other prostanoids derived from COX-2 oxygenation of eCBs on mIPSCs. PGD2-G, PGF2alpha-G and PGD2-EA, but not PGE2-EA or PGF2alpha-EA, also increased the frequency of mIPSCs. The eCB-derived prostanoid-induced responses appeared to be different from those of corresponding arachidonic acid-derived prostanoids, implying that these effects are not mediated via known prostanoid receptors. We further discovered that the inhibition of COX-2 activity reduced inhibitory synaptic activity and augmented depolarization-induced suppression of inhibition (DSI), whereas the enhancement of COX-2 augmented the synaptic transmission and abolished DSI. Our results, which show that COX-2 oxidative metabolites of eCBs exert opposite effects to their parent molecules on inhibitory synaptic transmission, suggest that alterations in COX-2 activity will have significant impact on endocannabinoid signalling in hippocampal synaptic activity.

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  • Blocking COX-2 limits the production of active oxidative metabolites of AEA and 2-AG that are posited to exert effects at as yet undetermined receptors.

    “blocking COX-2 will limit the production of the active oxidative metabolites of AEA (prostaglandin-Gs) and 2-AG (prostaglandin-EAs), that are posited to exert their own effects at as yet to be determined receptors (Hu et al., 2008; Sang et al., 2006; Yang and Chen, 2008).”

    From The endocannabinoid system as a target for novel anxiolytic drugs (2017) · cites this paper as Sang et al., 2006

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  1. C 2006 The Authors. Journal compilation C 2006 The Physiological Society 14697793, 2006, 3, Downloaded from https://physoc.onlinelibrary.wiley.com/doi/10.1113/jphysiol.2006.105569 by Mount Vernon Nazarene University, Wiley Online Library on [23/06/2026]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License J Physiol 572. · DOI

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Authors
Sang, N., Zhang, J., & Chen, C.
Affiliations
Louisiana State University Health Sciences Center New Orleans (US)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2006-04-21
Volume
572
Issue
3
Pages
735-745
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W1567735918
Cited by
89
References
38
Citations by year
2025: 1 · 2024: 1 · 2023: 3 · 2022: 5 · 2021: 2 · 2020: 5 · 2019: 2 · 2018: 1 · 2017: 2 · 2016: 5 · 2015: 4 · 2014: 8 · 2013: 5 · 2012: 4
FWCI
6.05
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Alzheimer's Association
  • National Institutes of Health
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Pharmacology › Inflammatory mediators and NSAID effects
Keywords
2-arachidonoylglycerol, cyclooxygenase-2, synaptic inhibition, miniature inhibitory postsynaptic currents, hippocampal neurons, depolarization-induced suppression of inhibition, IP3 receptor, MAPK signaling, endocannabinoid signaling
MeSH terms
Animals, Animals, Newborn, Arachidonic Acids, Cells, Cultured, Dose-Response Relationship, Drug, Esters, Glycerides, Glycerol, Hippocampus, Neural Inhibition, Synaptic Transmission, Neurons, Oxidation-Reduction, Dinoprostone, Mice, Cyclooxygenase 2, Endocannabinoids

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