Cited by 107Neuroscience and Neuropharmacology ResearchCannabis and Cannabinoid ResearchNeuroendocrine regulation and behavior

Retrograde Regulation of GABA Transmission by the Tonic Release of Oxytocin and Endocannabinoids Governs Postsynaptic Firing

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Oliet, Stéphane H. R., Baimoukhametova, Dinara V., Piet, Richard, Bains, Jaideep S.·2007·The Journal of Neuroscience

Abstract

The probability of neurotransmitter release at the nerve terminal is an important determinant of synaptic efficacy. At some central synapses, the postsynaptic, or target, neuron determines neurotransmitter release probability (Pr) at the presynaptic terminal. The mechanisms responsible for this target-cell dependent control of Pr have not been elucidated. Using whole-cell patch-clamp recordings from magnocellular neurosecretory cells in the paraventricular and supraoptic nuclei of the hypothalamus, we demonstrate that inhibitory, GABA synapses specifically onto oxytocin (OT)-producing neurosecretory cells exhibit a low Pr that is relatively uniform at multiple synapses onto the same cell. This low Pr results from a two-step process that requires the tonic release of OT from the postsynaptic cell. The ambient extracellular levels of neuropeptide are sufficient to activate postsynaptic OT receptors and trigger the Ca 2+-dependent production of endocannabinoids, which act in a retrograde manner at presynaptic cannabinoid CB 1 receptors to decrease GABA release. The functional consequence of this tonic inhibition of GABA release is that all inhibitory inputs facilitate uniformly when activated at high rates of activity. This causes inhibition in the postsynaptic cell that is sufficiently powerful to disrupt firing. Blockade of CB 1 receptors increases Pr at these synapses, resulting in a rapid depression of IPSCs at high rates of activity, thereby eliminating the ability of afferent inputs to inhibit postsynaptic firing. By playing a deterministic role in GABA release at the afferent nerve terminal, the postsynaptic OT neuron effectively filters synaptic signals and thereby modulates its own activity patterns.

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Crossref · 10.1523/jneurosci.2676-06.2007

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  • Oxytocin signalling controls the probability of presynaptic GABA release through postsynaptic release of endocannabinoids and activation of presynaptic CB1 receptors.

    “oxytocin signalling controls the probability of presynaptic GABA release through the postsynaptic release of endocannabinoids and the activation of presynaptic CB1 receptors50.”

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Authors
Oliet, S. H. R., Baimoukhametova, D. V., Piet, R., & Bains, J. S.
Affiliations
  • Inserm (FR)
  • University of Calgary (CA)
  • Université Bordeaux Segalen (FR)
Corresponding author
Bains, Jaideep S.
Venue
The Journal of Neuroscience
Published
2007-02-07
Volume
27
Issue
6
Pages
1325-1333
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2091992063
Cited by
107
References
64
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2023: 4 · 2022: 4 · 2021: 5 · 2020: 2 · 2019: 2 · 2018: 2 · 2017: 6 · 2016: 3 · 2015: 7 · 2014: 9 · 2013: 7 · 2012: 8
FWCI
4.23
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Fondation pour la Recherche Médicale
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
Keywords
retrograde regulation, oxytocin, endocannabinoids, CB1 receptor, postsynaptic inhibition, presynaptic inhibition, magnocellular neurosecretory cells, paraventricular nucleus, supraoptic nucleus, hypothalamus, inhibitory synapses
MeSH terms
Animals, Calcium, Egtazic Acid, Female, gamma-Aminobutyric Acid, Hypothalamus, Anterior, Male, Morpholines, Naphthalenes, Oxytocin, Paraventricular Hypothalamic Nucleus, Piperidines, Pyrazoles, Rats, Sprague-Dawley, Rats, Wistar, Presynaptic Terminals, Patch-Clamp Techniques, 6-Cyano-7-nitroquinoxaline-2,3-dione, Receptor, Cannabinoid, CB1, Extracellular Fluid, Benzoxazines, Rats, Cannabinoid Receptor Modulators, Endocannabinoids

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