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Modeling a Ca(2+) channel/BKCa channel complex at the single-complex level.

Daniel H Cox1

  • 1Department of Neuroscience, Tufts University School of Medicine, Boston, Massachusetts.

Biophysical Journal
|December 18, 2014
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Summary
This summary is machine-generated.

A new stochastic model reveals that BKCa channels in CaV2.1/BKCa complexes open infrequently, influenced by action potential duration and calcium buffers. This model aids understanding of neural electrical properties.

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Biophysics

Background:

  • BKCa channel activity influences neuronal firing, action potentials, and neurotransmitter release.
  • BKCa channels form complexes with voltage-gated Ca(2+) channels (CaV channels), where Ca(2+) influx activates associated BKCa channels.
  • Accurate modeling of neuronal electrical properties requires quantitative models of these CaV/BKCa complexes.

Purpose of the Study:

  • To develop a stochastic model for CaV2.1/BKCa complexes, essential for understanding their behavior in populations where Ca(2+) exposure varies.
  • To provide a quantitative, kinetic model of the CaV2.1/BKCa(α-only) complex found in central nerve terminals.

Main Methods:

  • Kinetic modeling of individual CaV2.1 and BKCa(α-only) channels at physiological temperatures.
  • Development of a stochastic model for the CaV2.1/BKCa complex.
  • Simulation of complex behavior under typical cortical action potentials and trains.

Main Results:

  • The CaV2.1/BKCa model predicts BKCa channels open in only ~30% of trials, highly sensitive to AP duration, channel distance, and Ca(2+) buffers.
  • BKCa current kinetics are not limited by CaV2.1 channel kinetics.
  • Complexes can follow rapid action potential trains faithfully.

Conclusions:

  • The stochastic model provides crucial insights into CaV2.1/BKCa complex behavior in vivo.
  • This model can be integrated into higher-level models of neural function.
  • Understanding CaV/BKCa complex dynamics is vital for neuroscience research.