Cited by 114Neuroscience and Neuropharmacology ResearchIon channel regulation and functionNicotinic Acetylcholine Receptors Study

Presynaptic R-type calcium channels contribute to fast excitatory synaptic transmission in the rat hippocampus

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Gasparini, Sonia, Kasyanov, Alexander M., Pietrobon, Daniela, Voronin, Leon L., Cherubini, Enrico·2001·The Journal of Neuroscience

Abstract

The possibility that R-type calcium channels contribute to fast glutamatergic transmission in the hippocampus has been assessed using low concentrations of NiCl(2) and the peptide toxin SNX 482, a selective antagonist of the pore-forming alpha(1E) subunit of R-type calcium channel. EPSPs or EPSCs were recorded in the whole-cell configuration of the patch-clamp technique mainly from CA3 hippocampal neurons. Effects of both NiCl(2) and SNX 482 were tested on large (composite) EPSCs evoked by mossy and associative-commissural fiber stimulation. NiCl(2) effects were also tested on minimal EPSPs-EPSCs. Both substances reduced the amplitude of EPSPs-EPSCs. This effect was associated with an increase in the number of response failures of minimal EPSPs-EPSCs, an enhancement of the paired-pulse facilitation ratios of both minimal and composite EPSCs, and a reduction of the inverse squared coefficient of variation (CV(-2)). The reduction of CV(-2) was positively correlated with the decrease in EPSC amplitude. The inhibitory effect of NiCl(2) was occluded by SNX 482 but not by omega-conotoxin-MVIIC, a broad-spectrum antagonist thought to interact with N- and P/Q-type calcium channels, supporting a specific action of low concentrations of NiCl(2) on R-type calcium channels. Together, these observations indicate that both NiCl(2) and SNX 482 act at presynaptic sites and block R-type calcium channels with pharmacological properties similar to those encoded by the alpha(1E) gene. These channels are involved in fast glutamatergic transmission at hippocampal synapses.

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Crossref · 10.1523/jneurosci.21-22-08715.2001

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  • P/Q- and N-type Ca2+ channels are localized to active zones, and the related R-type Ca2+ channel may also be present.

    “P/Q- (Cav2.1) and N-type Ca2+ channels (Cav2.2) are localized to active zones, and the related R-type Ca2+ channel (Cav2.3) may also be present (Gasparini et al., 2001; Li et al., 2007).”

    From The Presynaptic Active Zone (2012) · cites this paper as Gasparini et al., 2001

    The introduction states that N- and P/Q-type channels are localized at presynaptic release sites. The Discussion reports evidence favoring R-type channels on the same nerve endings, but it does not establish that R-type channels are at the active zones specifically; it notes that channels may be more or less close to them. Page numbers were not available in our copy. (LLM, conf=0.84)

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Authors
Gasparini, S., Kasyanov, A. M., Pietrobon, D., Voronin, L. L., & Cherubini, E.
Affiliations
  • Scuola Internazionale Superiore di Studi Avanzati (IT)
  • University of Padua (IT)
Venue
The Journal of Neuroscience
Published
2001-11-15
Volume
21
Issue
22
Pages
8715-8721
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2152544375
Cited by
114
References
43
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2022: 5 · 2021: 2 · 2020: 4 · 2019: 3 · 2018: 3 · 2017: 2 · 2016: 4 · 2015: 2 · 2014: 7 · 2013: 4 · 2012: 10
FWCI
2.46
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • SDL (submittedVersion)
  • Padua Research Archive (University of Padova) (submittedVersion)
Funders
Wellcome Trust
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
Keywords
R-type calcium channels, presynaptic calcium channels, hippocampus, CA3 neurons, EPSC, EPSPS, nickel chloride, SNX-482, alpha1E subunit, paired-pulse facilitation, synaptic variability, mossy fibers, omega-conotoxin MVIIC
MeSH terms
Animals, Calcium Channel Blockers, Hippocampus, Synaptic Transmission, Neurons, Nickel, Spider Venoms, Rats, Wistar, Presynaptic Terminals, Mossy Fibers, Hippocampal, Excitatory Postsynaptic Potentials, Calcium Channels, R-Type, Rats, In Vitro Techniques

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