Cited by 85Ion channel regulation and functionstochastic dynamics and bifurcationNeural dynamics and brain function

Calcium-Activated SK Channels Influence Voltage-Gated Ion Channels to Determine the Precision of Firing in Globus Pallidus Neurons

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Deister, C. A., Chan, C. S., Surmeier, D. J., Wilson, C. J.·2009·Journal of Neuroscience

Abstract

Globus pallidus (GP) neurons fire rhythmically in the absence of synaptic input, suggesting that they may encode their inputs as changes in the phase of their rhythmic firing. Action potential afterhyperpolarization (AHP) enhances precision of firing by ensuring that the ion channels recover from inactivation by the same amount on each cycle. Voltage-clamp experiments in slices showed that the longest component of the GP neuron's AHP is blocked by apamin, a selective antagonist of calcium-activated SK channels. Application of 100 nm apamin also disrupted the precision of firing in perforated-patch and cell-attached recordings. SK channel blockade caused a small depolarization in spike threshold and made it more variable, but there was no reduction in the maximal rate of rise during an action potential. Thus, the firing irregularity was not caused solely by a reduction in voltage-gated Na(+) channel availability. Subthreshold voltage ramps triggered a large outward current that was sensitive to the initial holding potential and had properties similar to the A-type K(+) current in GP neurons. In numerical simulations, the availability of both Na(+) and A-type K(+) channels during autonomous firing were reduced when SK channels were removed, and a nearly equal reduction in Na(+) and K(+) subthreshold-activated ion channel availability produced a large decrease in the neuron's slope conductance near threshold. This change made the neuron more sensitive to intrinsically generated noise. In vivo, this change would also enhance the sensitivity of GP neurons to small synaptic inputs.

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Authors
Deister, C. A., Chan, C. S., Surmeier, D. J., & Wilson, C. J.
Affiliations
  • The University of Texas at San Antonio (US)
  • Northwestern University (US)
Venue
Journal of Neuroscience
Published
2009-07-01
Volume
29
Issue
26
Pages
8452-8461
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1968985578
Cited by
85
References
40
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 1 · 2022: 4 · 2021: 5 · 2020: 2 · 2019: 4 · 2018: 2 · 2017: 7 · 2016: 6 · 2015: 10 · 2014: 8 · 2013: 11 · 2012: 5
FWCI
2.82
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Parkinson's Disease Foundation
  • American Parkinson Disease Association
  • National Institute of Neurological Disorders and Stroke (NS-47085, F31NS064755, P50NS047085)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › stochastic dynamics and bifurcation
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
Keywords
apamin, A-type potassium current, voltage-gated sodium channels, spike threshold, basal ganglia
MeSH terms
Action Potentials, Animals, Animals, Newborn, Apamin, Biophysics, Electric Stimulation, Globus Pallidus, Glutamate Decarboxylase, Ion Channels, Membrane Potentials, Mice, Inbred C57BL, Neurons, Parvalbumins, Potassium, Sodium, Gene Expression, Rats, Sprague-Dawley, Patch-Clamp Techniques, Statistics, Nonparametric, Potassium Channel Blockers, Mice, Rats, Small-Conductance Calcium-Activated Potassium Channels, Shal Potassium Channels, In Vitro Techniques

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