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Related Concept Videos

The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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Related Experiment Video

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Isolation of High Quality Murine Atrial and Ventricular Myocytes for Simultaneous Measurements of Ca2+ Transients and L-Type Calcium Current
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Quantitative aspects of L-type Ca2+ currents.

Henry C Tuckwell1

  • 1Max Planck Institute for Mathematics in the Sciences, Inselstr. 22, 04103 Leipzig, Germany. tuckwell@mis.mpg.de

Progress in Neurobiology
|October 20, 2011
PubMed
Summary
This summary is machine-generated.

This review quantifies L-type calcium currents (I(CaL)) and their subtypes (Ca(v)1.1-Ca(v)1.4), crucial for cellular dynamics. It analyzes experimental data and modeling approaches for I(CaL) activation and inactivation.

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Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents

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Area of Science:

  • Electrophysiology
  • Cellular Dynamics
  • Ion Channel Physiology

Background:

  • Calcium (Ca2+) currents are classified into five types: high-threshold (L, N, P/Q, R) and low-threshold (T).
  • L-type calcium channels, specifically Ca(v)1.1-Ca(v)1.4, are vital for neuronal and cardiac cell function, influencing firing rates, pacemaking, and gene transcription.
  • L-type calcium currents (I(CaL)) exhibit diverse half-activation potentials and inactivation mechanisms (voltage-dependent and calcium-dependent).

Purpose of the Study:

  • To review and quantify the dynamical properties of L-type calcium currents (I(CaL)).
  • To analyze experimental data and modeling approaches for I(CaL) activation and inactivation across various cell types.
  • To discuss the roles of L-type calcium channel subtypes in normal physiology and pathological conditions.

Main Methods:

  • Compilation and statistical analysis of dynamical properties of I(CaL) from over 65 studies spanning 25 years.
  • Review of modeling approaches, including activation, voltage-dependent inactivation (VDI), and calcium-dependent inactivation (CDI).
  • Comparison of experimental data with modeling calculations using linear and constant field methods.

Main Results:

  • L-type calcium currents (I(CaL)) show a wide range of half-activation potentials (-50mV to 0mV).
  • Neurons exhibit two main groups of half-activation potentials (≈ -18.3mV and ≈ -36.4mV), aligning with Ca(v)1.2 and Ca(v)1.3 channel properties.
  • Experimental data on activation time constants are scarce (0.5-2ms), while VDI inactivation time constants average 65ms.

Conclusions:

  • Significant variability exists in I(CaL) kinetics, with limited complete experimental data at physiological calcium concentrations.
  • A major challenge in quantitative studies is the extrapolation of kinetic parameters between different cell types.
  • Understanding Ca(v)1.1-Ca(v)1.4 subtype properties is crucial for comprehending normal cellular activity, including pacemaking, and various disease states.