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Zn(2+) slows down Ca(V)3.3 gating kinetics: implications for thalamocortical activity.

M Cataldi1, V Lariccia, V Marzaioli

  • 1Divisione di Farmacologia, Dipartimento di Neuroscienze, Facoltà di Medicina e Chirurgia, Università di Napoli Federico II, Naples, Italy.

Journal of Neurophysiology
|August 19, 2007
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Summary

Zinc ions (Zn2+) alter the gating of brain-specific T-type calcium channels (CaV3.3), increasing neuronal excitability and potentially influencing brain rhythms like thalamocortical oscillations.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biophysics

Background:

  • T-type calcium channels, specifically the CaV3.3 isoform, are crucial for neuronal excitability.
  • Zinc (Zn2+) is an endogenous ion with known modulatory roles in the brain.
  • Understanding how Zn2+ affects CaV3.3 channel function is key to comprehending neuronal activity.

Purpose of the Study:

  • To investigate the impact of Zn2+ on the gating kinetics of the brain-specific T-type calcium channel CaV3.3.
  • To determine the functional consequences of Zn2+-induced CaV3.3 channel modulation on neuronal excitability and firing patterns.

Main Methods:

  • Whole-cell patch-clamp recordings in HEK-293 cells expressing CaV3.3.
  • Analysis of channel gating parameters (activation, inactivation, deactivation, recovery).
  • Computer simulations of action potential generation and experimental validation in rat thalamocortical slices.

Main Results:

  • Zn2+ (300 microM) significantly slowed CaV3.3 current inactivation and deactivation, moderately affected activation, and reduced Ca2+ permeability.
  • Simulations showed Zn2+ increased burst firing frequency and duration in thalamic reticular cells.
  • Chelation of endogenous Zn2+ reduced ictal-like discharges in rat thalamocortical slices.

Conclusions:

  • Zn2+ modulates CaV3.3 channel gating, leading to increased neuronal excitability.
  • Endogenous Zn2+ may play a role in regulating thalamocortical oscillations and neuronal network activity.
  • These findings highlight Zn2+ as a key modulator of T-type calcium channel function in the brain.