Cited by 27Ion channel regulation and functionNeuroscience and Neuropharmacology ResearchNeuroscience of respiration and sleep

Relationship between afterhyperpolarization profiles and the regularity of spontaneous firings in rat medial vestibular nucleus neurons

Saito, Yasuhiko, Takazawa, Tomonori, Ozawa, Seiji·2008·European Journal of Neuroscience

Abstract

Our previous in vivo and in vitro whole‐cell patch‐clamp recording studies demonstrated that neurons in the medial vestibular nucleus (MVN) could be characterized on the basis of three electrophysiological properties: afterhyperpolarization (AHP) profile; firing pattern; and response pattern to hyperpolarizing current pulses. In the present study, to clarify which types of the classified MVN neurons correspond to neurons with regular or irregular firing, we investigated their spike discharge patterns using whole‐cell patch‐clamp recording in both in vivo and in vitro preparations. The discharge regularity was related to AHP profiles, and we found that: (i) the coefficient of variation (CV) of interspike intervals during spike discharges was smaller in neurons exhibiting AHP with a slow component [AHP(s+)] than in those without a slow component [AHP(s−)], or with a slow AHP component preceded by afterdepolarization (ADP) [AHP(s+) with ADP]; (ii) the blockade of Ca 2+‐dependent K+ channels by 100 n m apamin abolished the slow component and increased the CV in neurons exhibiting AHP(s+); and (iii) the modulation of firing (firing gain) in response to ramp current was larger in neurons exhibiting AHP(s−) than in the other two neuronal types. These results suggest that neurons exhibiting AHP(s+) are regularly discharging neurons with small firing gains to stimulus, neurons exhibiting AHP(s+) with ADP are irregularly discharging neurons with small firing gains, and neurons exhibiting AHP(s−) are irregularly discharging neurons with large firing gains. The regular firing of neurons exhibiting AHP(s+) is attributed to the activation of apamin‐sensitive Ca 2+‐dependent K+ channels.

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Crossref · 10.1111/j.1460-9568.2008.06338.x

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Authors
Saito, Y., Takazawa, T., & Ozawa, S.
Affiliations
Gunma University (JP)
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
2008-07
Volume
28
Issue
2
Pages
288-298
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W2148990678
Cited by
27
References
54
Citations by year
2025: 1 · 2024: 1 · 2021: 2 · 2019: 2 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 2 · 2014: 2 · 2013: 2 · 2012: 4
FWCI
0.82
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Brain Science Foundation
  • Ministry of Education, Culture, Sports, Science and Technology
  • Japan Society for the Promotion of Science
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
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
Keywords
medial vestibular nucleus, afterhyperpolarization, slow afterhyperpolarization, afterdepolarizations, interspike interval coefficient of variation, apamin, calcium-activated potassium channels, vestibular neurons
MeSH terms
Action Potentials, Animals, Apamin, Electrophysiology, Neurons, Reaction Time, Vestibular Nuclei, Rats, Wistar, Patch-Clamp Techniques, Rats, Small-Conductance Calcium-Activated Potassium Channels, In Vitro Techniques

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