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Related Experiment Video

Updated: Feb 27, 2026

GABA-activated Single-channel and Tonic Currents in Rat Brain Slices

GABA-activated Single-channel and Tonic Currents in Rat Brain Slices

Published on: July 17, 2011

GABA-B Controls Persistent Na⁺ Current and Coupled Na⁺-Activated K⁺ Current.

Ping Li¹, Richard Stewart¹, Alice Butler¹

¹Department of Neuroscience, Washington University School of Medicine, St. Louis, MO 63110.

|June 30, 2017

Summary

GABA-B receptor activation in rat mitral cells inhibits persistent sodium and sodium-activated potassium currents. This dual inhibition can lead to either net excitatory or inhibitory effects, impacting neuronal function.

Keywords:

Baclofen GABA-B SLO2 Slick mitral cell olfactory bulb persistent sodium current potassium channel

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Published on: November 14, 2014

Area of Science:

Neuroscience
Molecular Biology
Cellular Physiology

Background:

GABA-B receptors are widespread in the central nervous system (CNS) and linked to numerous functions and disorders.
The precise mechanisms by which GABA-B receptors influence diverse CNS functions, especially contradictory response patterns, are not fully understood.

Purpose of the Study:

To investigate the specific effects of GABA-B receptor activation on ion currents in rat mitral cells of the olfactory bulb.
To elucidate the interplay between GABA-B receptor activation, persistent sodium current (INaP), and sodium-activated potassium current (IKNa).

Main Methods:

Electrophysiological recordings in rat mitral cells.
Pharmacological activation of GABA-B receptors.
Analysis of persistent sodium current (INaP) and sodium-activated potassium current (IKNa).

Main Results:

GABA-B receptor activation was found to inhibit both INaP and IKNa in mitral cells.
The primary effect is inhibition of INaP, leading to a secondary inhibition of IKNa due to its dependence on INaP.
The net effect on neuronal excitability depends on the balance between INaP and IKNa.

Conclusions:

GABA-B receptor activation has a complex modulatory role in mitral cells, affecting both inhibitory and potentially excitatory pathways.
Understanding this mechanism is crucial for comprehending GABA-B receptor involvement in olfactory processing and CNS disorders.
The findings suggest GABA-B receptor activation may reduce the shunting effect of IKNa, thereby enhancing synaptic potential effectiveness in mitral cells.