This study investigates the role of dopamine in the nucleus accumbens (NAc) using an anesthetized rat model. By employing electrical stimulation of the ventral tegmental area (VTA), the research examines the effects of activator and inhibitor drugs on dopamine release and electrical signals in the NAc.
Begin with an immobilized, anesthetized rat with an activated carbon microelectrode implanted in the nucleus accumbens or NAc region and a reference wire in the left hemisphere.
These electrodes are connected to a potentiostat, which measures dopamine-generated electrical signals.
A stimulating electrode with a guide cannula is implanted into the ventral tegmental area or VTA, targeting dopaminergic neurons that project into the NAc region.
Apply electrical pulses via the stimulating electrode that activate the VTA neurons, releasing dopamine, a chemical messenger, into the NAc region.
In the NAc region, dopamine interacts with the carbon electrode and undergoes oxidation and reduction, generating baseline electrical signals.
Insert an internal cannula into the guide cannula to infuse either an activator or an inhibitor drug.
The activator drug stimulates the VTA neurons, increasing dopamine release and elevating electrical signals.
In contrast, the inhibitory drug decreases the electrical signal by preventing dopamine release.
Stimulate the animal every three minutes for 20 to 30 minutes. After achieving a stable baseline, gently lower the internal cannula by hand into the guide cannula, pre-fitted into the bipolar stimulator, and obtain an additional two to three baseline recordings to confirm that the cannula insertion did not cause a change in the evoked signal.
Once a baseline response has been established, use a syringe pump in a microsyringe to infuse 0.5 microliters of the drug solution of interest into the VTA over a two-minute period. After the infusion, leave the internal cannula in place for at least one minute prior to removal, continuing to record the response every three minutes to measure the post-infusion effects.
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