Cocaine as a Conditioned Stimulus for Dopamine Release
Author Information
Author(s): Wise Roy A., Wang Bin, You Zhi-Bing
Primary Institution: National Institute on Drug Abuse, National Institutes of Health
Hypothesis
Can the interoceptive effects of cocaine serve as conditioned stimuli that trigger dopamine release?
Conclusion
Cocaine's peripheral effects can condition glutamate release, which in turn activates dopamine release and reinstates cocaine-seeking behavior.
Supporting Evidence
- Rats trained to self-administer cocaine showed reinstated drug-seeking behavior after receiving cocaine methiodide.
- Glutamate release in the ventral tegmental area was triggered by cocaine-predictive cues.
- Immediate dopamine elevations were observed in cocaine-experienced rats following cocaine administration.
Takeaway
When rats get cocaine, their bodies learn to expect it, and even just the feeling of cocaine can make them want more, even if they haven't had it for a while.
Methodology
The study used brain microdialysis to measure glutamate and dopamine release in rats trained to self-administer cocaine.
Potential Biases
Potential bias in interpreting the effects of cocaine due to the reliance on animal models.
Limitations
The study primarily involved male Long-Evans rats, which may limit the generalizability of the findings to other populations.
Participant Demographics
Fifty-nine male Long-Evans rats, weighing 350–400 g.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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