Related Experiment Video

Updated: Jun 27, 2025

Single-Cell Calcium Imaging for Studying the Activation of Calcium Ion Channels
07:17

Single-Cell Calcium Imaging for Studying the Activation of Calcium Ion Channels

Published on: December 13, 2024

673

The Effect of Calcium Ions on the Electrophysiological Properties of Single ANO6 Channels

D O Kolesnikov1, E R Grigorieva1, M A Nomerovskaya1

  • 1Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, 194064 Russian Federation.

Acta Naturae
|May 3, 2024
PubMed

Insights

Anoctamin 6 (ANO6) channels, involved in cell death and membrane dynamics, show dual calcium regulation. Increased extracellular calcium activates ANO6, while intracellular calcium doubles its amplitude, revealing new regulatory mechanisms.

Area of Science:

  • Molecular biology
  • Cell physiology
  • Biophysics

Background:

  • Anoctamin 6 (ANO6), also known as TMEM16F, is a unique protein with dual functions as a calcium-activated chloride channel (CaCC) and a calcium-dependent phospholipid scramblase.
  • ANO6 plays critical roles in cellular processes including plasma membrane dynamics, phosphatidylserine externalization, and programmed cell death.
  • Despite its importance, the precise electrophysiological properties and regulatory mechanisms of ANO6 channels remain incompletely understood.

Purpose of the Study:

  • To investigate the impact of varying intracellular and extracellular calcium ion concentrations on the electrophysiological characteristics of endogenous ANO6 channels.
  • To elucidate the specific roles of calcium ions on both sides of the plasma membrane in modulating ANO6 channel activity.

Main Methods:

  • Recording of single endogenous ANO6 channels to analyze their electrophysiological properties.
  • Systematic variation of extracellular and intracellular calcium ion concentrations.

Main Results:

  • Elevated extracellular calcium concentrations significantly increase the activity of endogenous ANO6 channels.
  • ANO6 channel permeability to chloride ions is not influenced by extracellular calcium levels.
  • Increased intracellular calcium concentration results in the activation of ANO6 channels with a doubled amplitude.
  • The kinetic behavior of ANO6 channels is primarily dictated by the plasma membrane potential, not the intracellular calcium concentration.

Conclusions:

  • The study proposes novel mechanisms for ANO6 channel regulation by calcium ions, acting from both the intracellular and extracellular sides of the membrane.
  • Findings contribute to a deeper understanding of ANO6 channel function in cellular signaling and membrane transport.
Keywords:
ANO6TMEM16Fcalcium-activated chloride channelspatch-clamp techniquerecording currents through single channels

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