Cited by 116Cannabis and Cannabinoid ResearchNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Interneuron activity controls endocannabinoid-mediated presynaptic plasticity through calcineurin

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Heifets, Boris D., Chevaleyre, Vivien, Castillo, Pablo E.·2008·Proceedings of the National Academy of Sciences

Abstract

Retrograde signaling by endocannabinoids (eCBs) mediates a widely expressed form of long-term depression at excitatory and inhibitory synapses (eCB-LTD), involving a reduction in neurotransmitter release. In the hippocampus, eCB-LTD occurs at interneuron (IN)-pyramidal cell (PC) synapses (I-LTD), and its induction requires a presynaptic reduction of cAMP/PKA signaling resulting from minutes of type 1 cannabinoid receptor (CB1R) activation. Although repetitive activity of glutamatergic synapses initiates the eCB mobilization required for I-LTD, it is unclear whether CB1R-containing GABAergic terminals are passive targets of eCBs or whether they actively contribute to induction. Here, we show that the minutes-long induction period for I-LTD may serve as a window to integrate associated spontaneous activity in the same IN receiving the retrograde eCB signal. Indeed, reducing spontaneous IN firing blocked I-LTD, which could be rescued with extra stimulation of inhibitory afferents. Moreover, cell pair recordings showed that a single IN expressed LTD onto a PC only if it was active during eCB signaling. Several methods of disrupting presynaptic Ca(2+) dynamics all blocked I-LTD, strongly suggesting that IN spikes regulate I-LTD by raising Ca(2+) at the nerve terminal. Finally, inhibiting the Ca(2+)-activated phosphatase, calcineurin, fully blocked I-LTD, but blocking another phosphatase did not. Our findings support a model where both CB1R signaling and IN activity shift the balance of kinase and phosphatase activity in the presynaptic terminal to induce I-LTD.

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Crossref · 10.1073/pnas.0711880105

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  • CB1R negatively regulates N- and P/Q-type voltage-gated calcium channels and positively regulates inwardly rectifying K+ channels, as well as calcineurin, to change the phosphorylation state of effector molecules.

    “In addition, CB1R negatively regulates N- and P/Q-type voltage-gated calcium channels [26] and positively regulates inwardly rectifying K+ channels [26,27], as well as protein serine/threonine phosphatase 2B (calcineurin, PP2B) to change the phosphorylation state of various effector molecules [28,29].”

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Authors
Heifets, B. D., Chevaleyre, V., & Castillo, P. E.
Affiliations
Albert Einstein College of Medicine (US)
Venue
Proceedings of the National Academy of Sciences
Published
2008-07-22
Volume
105
Issue
29
Pages
10250-10255
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2040301525
Cited by
116
References
47
Citations by year
2026: 1 · 2025: 5 · 2024: 1 · 2023: 3 · 2022: 4 · 2021: 7 · 2020: 7 · 2019: 2 · 2018: 6 · 2017: 7 · 2016: 8 · 2015: 5 · 2014: 9 · 2013: 11 · 2012: 6
FWCI
7.97
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Alliance for Research on Schizophrenia and Depression
  • National Institutes of Health
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
presynaptic plasticity, calcineurin, CB1 receptor, hippocampus, cAMP/PKA signaling, phosphatase activity
MeSH terms
Animals, Electric Stimulation, Electrophysiology, Hippocampus, Interneurons, Neuronal Plasticity, Tetrodotoxin, Signal Transduction, Rats, Sprague-Dawley, Pyramidal Cells, Patch-Clamp Techniques, Calcineurin, Calcium Signaling, Long-Term Synaptic Depression, Receptor, Cannabinoid, CB1, Rats, Cannabinoid Receptor Modulators, Endocannabinoids, Calcineurin Inhibitors, In Vitro Techniques

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