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A thalamic input to the nucleus accumbens mediates opiate dependence
Yingjie Zhu1, Carl F R Wienecke1, Gregory Nachtrab1
1Department of Biology, Stanford University, Stanford, California 94305, USA.
Nature
|February 4, 2016
Summary
Researchers discovered a brain pathway crucial for opiate withdrawal symptoms. Targeting the paraventricular nucleus of the thalamus to nucleus accumbens circuit may offer new treatments for opiate addiction.
Area of Science:
- Neuroscience
- Addiction Research
Background:
- Chronic opiate use leads to dependence and severe withdrawal.
- The nucleus accumbens is key in drug reward and withdrawal motivation.
- Understanding nucleus accumbens circuitry in withdrawal is crucial.
Purpose of the Study:
- Identify brain pathways in the nucleus accumbens involved in opiate withdrawal.
- Investigate the role of the paraventricular nucleus of the thalamus in mediating withdrawal symptoms.
Main Methods:
- Used mouse models of opiate withdrawal.
- Investigated the paraventricular nucleus of the thalamus to nucleus accumbens pathway.
- Employed optogenetics to manipulate pathway activity.
- Examined synaptic plasticity and receptor changes.
Main Results:
- The paraventricular nucleus of the thalamus input to the nucleus accumbens mediates physical withdrawal signs and aversion.
- Silencing this pathway reduced withdrawal symptoms in mice.
- Morphine increased excitatory transmission via specific AMPA receptors.
- Optogenetic reversal of plasticity suppressed withdrawal.
Conclusions:
- Morphine-induced plasticity in the paraventricular nucleus of the thalamus to nucleus accumbens circuit drives opiate dependence.
- Reprogramming this circuit shows therapeutic potential for opiate addiction treatment.
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