Cited by 206Ion channel regulation and functionNeuroscience and Neuropharmacology ResearchCardiac electrophysiology and arrhythmias

Differential Gating and Recruitment of P/Q-, N-, and R-Type Ca2+Channels in Hippocampal Mossy Fiber Boutons

Open access
Li, Liyi, Bischofberger, Josef, Jonas, Peter·2007·The Journal of Neuroscience

Abstract

Voltage-gated Ca 2+channels in presynaptic terminals initiate the Ca 2+inflow necessary for transmitter release. At a variety of synapses, multiple Ca 2+channel subtypes are involved in synaptic transmission and plasticity. However, it is unknown whether presynaptic Ca 2+channels differ in gating properties and whether they are differentially activated by action potentials or subthreshold voltage signals. We examined Ca 2+channels in hippocampal mossy fiber boutons (MFBs) by presynaptic recording, using the selective blockers ω-agatoxin IVa, ω-conotoxin GVIa, and SNX-482 to separate P/Q-, N-, and R-type components. Nonstationary fluctuation analysis combined with blocker application revealed a single MFB contained on average ∼2000 channels, with 66% P/Q-, 26% N-, and 8% R-type channels. Whereas both P/Q-type and N-type Ca 2+channels showed high activation threshold and rapid activation and deactivation, R-type Ca 2+channels had a lower activation threshold and slower gating kinetics. To determine the efficacy of activation of different Ca 2+channel subtypes by physiologically relevant voltage waveforms, a six-state gating model reproducing the experimental observations was developed. Action potentials activated P/Q-type Ca 2+channels with high efficacy, whereas N- and R-type channels were activated less efficiently. Action potential broadening selectively recruited N- and R-type channels, leading to an equalization of the efficacy of channel activation. In contrast, subthreshold presynaptic events activated R-type channels more efficiently than P/Q- or N-type channels. In conclusion, single MFBs coexpress multiple types of Ca 2+channels, which are activated differentially by subthreshold and suprathreshold presynaptic voltage signals.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1523/jneurosci.1709-07.2007

Cites

57 of 57 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

2 of the 59 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Li, L., Bischofberger, J., & Jonas, P.
Affiliations
University of Freiburg (DE)
Venue
The Journal of Neuroscience
Published
2007-12-05
Volume
27
Issue
49
Pages
13420-13429
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2084434180
Cited by
206
References
59
Citations by year
2026: 10 · 2025: 7 · 2024: 13 · 2023: 18 · 2022: 9 · 2021: 8 · 2020: 6 · 2019: 13 · 2018: 10 · 2017: 10 · 2016: 4 · 2015: 6 · 2014: 16 · 2013: 8 · 2012: 15
FWCI
5.70
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (SFB 505)
  • Leibniz-Gemeinschaft
Topics
  • 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
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
Keywords
voltage-gated calcium channels, P/Q-type calcium channels, N-type calcium channels, R-type calcium channels, presynaptic terminals, channel gating kinetics, action potential broadening, synaptic transmission, omega-agatoxin IVA, omega-conotoxin GVIA, SNX-482, hippocampus
MeSH terms
Animals, Electric Stimulation, Synaptic Transmission, Recruitment, Neurophysiological, Calcium Channels, Ion Channel Gating, Rats, Wistar, Presynaptic Terminals, Mossy Fibers, Hippocampal, Calcium Channels, N-Type, Calcium Channels, P-Type, Calcium Channels, R-Type, Rats

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review