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Related Experiment Video

Updated: Jan 22, 2026

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention

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Published on: September 11, 2017

Sevoflurane Inhibits Layer 5 Pyramidal Neurons via Kv1.2-Dependent Modulation of Subthreshold Currents.

Aelton S Araujo¹, Gabriel M de Queiroz¹, Sérgio Ruschi B Silva¹

¹Hearing and Neuronal Activity Lab, Brain Institute, Federal University of Rio Grande do Norte, Natal, Brazil.

Journal of Neurochemistry

|January 20, 2026

Summary

General anesthetics like sevoflurane suppress brain activity by affecting specific neurons. This study shows sevoflurane impacts layer 5 pyramidal neurons via Kv1.2 channels, influencing neuronal excitability.

Keywords:

Kv1.2 Sevoflurane layer 5 primary auditory cortex pyramidal neurons voltage‐gated potassium channels

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Area of Science:

Neuroscience
Anesthesiology
Molecular Biology

Background:

General anesthetics disrupt consciousness by reducing cortical activity.
Layer 5 pyramidal neurons (L5 PNs) are key targets, with anesthetic effects potentially mediated by ion channels.
Kv1.2 potassium channels are highly expressed in L5 PNs and are potentiated by volatile anesthetics.

Purpose of the Study:

To investigate the effects of sevoflurane on L5 PNs in the auditory cortex.
To identify the role of Kv1.2 channels in sevoflurane-induced modulation of neuronal excitability.

Main Methods:

Whole-cell patch-clamp recordings in adult mouse primary auditory cortex.
Application of low-dose sevoflurane (~22 μM) and Kv1.2 blocker TsTX-Kα.
NEURON simulations using a detailed biophysical model of L5b pyramidal neurons.

Main Results:

Sevoflurane suppressed neuronal firing and induced cell-type-specific changes in L5 PNs.
Kv1.2 channel blockade partially reversed sevoflurane's subthreshold effects.
Simulations indicated a sevoflurane-induced increase in persistent K+ conductance, consistent with Kv1.2 potentiation.

Conclusions:

Sevoflurane exerts distinct, cell-type-specific effects on L5 PNs.
Kv1.2 channel potentiation is functionally relevant in sevoflurane's suppression of cortical excitability.
Kv1.2 channels may play a broader role in mediating anesthetic actions.