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Updated: Jul 13, 2026

Presynaptic Dopamine Dynamics in Striatal Brain Slices with Fast-scan Cyclic Voltammetry

Presynaptic Dopamine Dynamics in Striatal Brain Slices with Fast-scan Cyclic Voltammetry

Published on: January 12, 2012

Halothane increases non-vesicular [(3)H]dopamine release from brain cortical slices.

Paulo H C Diniz¹, Janice H Silva, Marcus V Gomez

¹Department of Pharmacology, Biological Sciences Institute, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

Cellular and Molecular Neurobiology

|August 8, 2007

Summary

Halothane anesthesia increases dopamine release in the brain via non-vesicular pathways. This effect is mediated by dopamine and norepinephrine transporters, not calcium or sodium channels.

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Published on: April 23, 2020

Area of Science:

Neuroscience
Anesthesiology
Pharmacology

Background:

Halothane anesthesia alters dopamine (DA) levels in brain regions.
The precise mechanism behind halothane's effect on dopamine release remains unclear.

Purpose of the Study:

To investigate the mechanism by which halothane affects dopamine release from rat brain cortical slices.
To characterize the involvement of transporters and cellular mechanisms in halothane-induced dopamine release.

Main Methods:

Rat brain cortical slices were labeled with radioactive dopamine ([ (3)H]DA).
The release and uptake of [ (3)H]DA were measured under various conditions, including different halothane concentrations, presence of inhibitors (TTX, reserpine, GBR 12909, nomifensine, nisoxetine, ouabain), and altered environmental factors (temperature, sodium levels).

Main Results:

Halothane significantly increased [ (3)H]DA release in a dose- and time-dependent manner.
This release was independent of extracellular/intracellular calcium and voltage-dependent sodium channels.
Halothane-induced release was inhibited by dopamine transporter (DAT) and norepinephrine transporter (NET) blockers, suggesting carrier-mediated release.
Halothane, GBR 12909, and nisoxetine reduced [ (3)H]DA uptake.
Low temperature, low extracellular sodium, and ouabain affected halothane-induced release, further supporting a carrier-mediated, non-vesicular mechanism.

Conclusions:

Halothane anesthesia promotes non-vesicular dopamine release from rat brain cortical slices.
The release is primarily mediated by the dopamine transporter (DAT) and norepinephrine transporter (NET) located on the plasma membrane.
These findings elucidate a novel mechanism for how anesthetics can modulate neurotransmitter systems.