Cited by 16Cannabis and Cannabinoid ResearchIon channel regulation and functionNeuroscience and Neuropharmacology Research

Enhancement of apamin-sensitive medium afterhyperpolarization current by anandamide and its role in excitability control in cultured hippocampal neurons

Wang, Wei, Zhang, Kun, Yan, Sen, Li, Ai, Hu, Xinwu, Zhang, Liangpin, Liu, Changjin·2011·Neuropharmacology

Abstract

Although endocannabinoid anandamide (AEA) plays an important role in synaptic signaling and neuronal survival, the underlying mechanism is not fully understood. Afterhyperpolarization (AHP) is the critical modulator of cell excitability and in turn shapes the neuronal output. Here, we examined the effects of AEA on AHP current and action potential firing in cultured rat hippocampal neurons. In whole-cell patch-clamp recording, AEA applied in the extracellular medium at nanomolar concentration enhanced medium AHP (mAHP) current and spike-frequency adaptation. Activation of apamin-sensitive, small conductance Ca(2+)-activated K(+) (SK) channels, probably SK2 and SK3 as the immunofluorescence analysis indicated, attributed largely to the AEA action on mAHP. Interestingly, AEA-induced potentiation of mAHP current was abolished by inositol 1,4,5-trisphosphate receptors (IP(3)Rs) blockade. However, the potentiation was not affected by inhibiting Ca(2+) influx or Ca(2+) release from internal store through ryanodine receptors. In addition, blockade of CB1, TRPV1 or Gi/o-protein did not attenuate the potentiation. Thus, AEA might enhance the SK mAHP currents mainly in a non-CB1/TRPV1 receptor way. Our study provides the first evidence that a functional cascade might lie among AEA, IP(3)Rs and SK channels, which may keep the membrane excitability stable in a negative-feedback manner.

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Crossref · 10.1016/j.neuropharm.2011.01.027

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Authors
Wang, W., Zhang, K., Yan, S., Li, A., Hu, X., Zhang, L., & Liu, C.
Affiliations
Huazhong University of Science and Technology (CN)
Corresponding author
Liu, Changjin
Venue
Neuropharmacology
Publisher
Elsevier BV
Published
2011-05
Volume
60
Issue
6
Pages
901-909
ISSN
0028-3908 (ISSN-L)
OpenAlex
W2079489804
Cited by
15
References
32
Citations by year
2025: 1 · 2021: 1 · 2019: 1 · 2017: 2 · 2016: 4 · 2015: 1 · 2014: 2 · 2012: 3
FWCI
1.17
Type
journal article
Language
en
Open access
closed
Locations
  • Neuropharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Specialized Research Fund for the Doctoral Program of Higher Education of China (20070487109)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
anandamide, small conductance calcium-activated potassium channels, SK2, SK3, IP3 receptor, hippocampal neurons, neuronal excitability, spike frequency adaptation, endocannabinoid signaling, negative feedback regulation
MeSH terms
Action Potentials, Animals, Animals, Newborn, Apamin, Arachidonic Acids, Calcium, Calcium Channel Blockers, Hippocampus, Membrane Potentials, Neural Inhibition, Neurons, Rats, Sprague-Dawley, Patch-Clamp Techniques, Cell Culture Techniques, GTP-Binding Proteins, Ryanodine Receptor Calcium Release Channel, Receptor, Cannabinoid, CB1, TRPV Cation Channels, Rats, Small-Conductance Calcium-Activated Potassium Channels, Polyunsaturated Alkamides, Inositol 1,4,5-Trisphosphate Receptors, Endocannabinoids

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