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Updated: Apr 24, 2026

Identification of Dopamine D1-Alpha Receptor Within Rodent Nucleus Accumbens by an Innovative RNA In Situ Detection Technology
Published on: March 27, 2018
Rapid dopamine transmission within the nucleus accumbens: dramatic difference between morphine and oxycodone
Caitlin M Vander Weele1, Kirsten A Porter-Stransky1, Omar S Mabrouk2
1Department of Psychology, University of Michigan, Ann Arbor, MI 48109.
Different opioids, morphine and oxycodone, cause distinct dopamine release patterns in the brain. This study reveals novel differences in opioid-induced neurotransmitter signaling, crucial for understanding their effects on behavior.
Area of Science:
- Neuroscience
- Pharmacology
- Neurochemistry
Background:
- Most drugs of abuse elevate dopamine, but release patterns vary.
- Rapid dopamine changes after psychostimulants are known, but not after opioids.
Purpose of the Study:
- To measure and compare rapid dopamine release patterns following intravenous morphine and oxycodone administration.
- To investigate associated changes in other neurotransmitters like GABA and glutamate.
Main Methods:
- Utilized fast-scan cyclic voltammetry and rapid microdialysis with HPLC-MS in drug-naïve rats.
- Measured real-time dopamine, GABA, glutamate, and other neurotransmitter concentrations.
Main Results:
- Both morphine and oxycodone increased nucleus accumbens dopamine, but with distinct patterns.
- Oxycodone caused a stable dopamine increase and enhanced phasic release; morphine caused a brief dopamine surge alongside a GABA increase.
- Neurotransmitter levels returned to baseline after morphine, unlike oxycodone.
Conclusions:
- Rapid neurotransmission measurements reveal significant, previously unknown differences in opioid-induced signaling.
- These distinct patterns may explain differential effects of morphine and oxycodone on motivation and behavior.
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