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Diverse voltage-sensitive dyes modulate GABAA receptor function.

Steven Mennerick1, Mariangela Chisari, Hong-Jin Shu

  • 1Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri 63110, USA. menneris@psychiatry.wustl.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 26, 2010
PubMed
Summary
This summary is machine-generated.

Voltage-sensitive dyes can alter neuronal function by modulating GABA(A) receptors, impacting excitability studies. Researchers must exercise caution when using these dyes to ensure accurate measurements of neural activity.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Pharmacology

Background:

  • Voltage-sensitive dyes are essential for measuring neuronal excitability.
  • Their potential to interfere with cellular function is often overlooked.
  • GABA(A) receptors play a critical role in regulating neuronal inhibition.

Purpose of the Study:

  • To investigate whether voltage-sensitive dyes affect GABA(A) receptor function.
  • To determine the potency and efficacy of dye interactions with GABA(A) receptors.
  • To assess the impact of these interactions on neuronal network activity.

Main Methods:

  • Electrophysiological recordings (multielectrode arrays).
  • Functional assays of GABA(A) receptor activity.
  • Application of various voltage-sensitive dyes, including Di-4-ANEPPS, DiBAC4(3), blue oxonols, ANNINE-6, and ANNINE-6plus.

Main Results:

  • Several voltage-sensitive dyes significantly modulated GABA(A) receptor function, acting as potentiators with varying potencies.
  • Di-4-ANEPPS and DiBAC4(3) showed potentiation similar to clinical modulators.
  • Blue oxonols exhibited biphasic effects, while ANNINE-6/ANNINE-6plus showed no baseline activity.
  • Photodynamic effects enhanced GABA(A) receptor activity even for dyes without baseline effects.
  • Dye-induced changes prolonged inhibitory postsynaptic currents (IPSCs) and reduced network activity.

Conclusions:

  • Voltage-sensitive dyes can directly influence GABAergic inhibition.
  • The observed effects can alter neuronal excitability and network dynamics.
  • Caution is advised when interpreting results from studies using these dyes, particularly in network activity assessments.