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Addiction and arousal: the hypocretin connection
Benjamin Boutrel1, Luis de Lecea
1Center for Psychiatric Neurosciences, Department of Psychiatry, University of Lausanne, Switzerland.
Physiology & Behavior
|February 12, 2008
Summary
Hypocretins (orexins) regulate arousal and are implicated in stress responses. Activating hypocretin neurons may drive addiction by affecting brain sensitization and reward systems, suggesting a new drug target for preventing relapse.
Area of Science:
- Neuroscience
- Addiction Research
- Neuropharmacology
Background:
- Hypocretins (orexins) are neuropeptides crucial for arousal regulation.
- Evidence suggests hypocretin neurons are involved in the hypothalamic stress response.
Purpose of the Study:
- To investigate the role of hypocretinergic system in stress-induced drug seeking behaviors.
- To explore the hypocretinergic system as a potential therapeutic target for addiction.
Main Methods:
- Intracerebral administration of hypocretin.
- Hypocretin receptor 1 antagonism.
- Analysis of cocaine sensitization and NMDA receptor involvement.
Main Results:
- Intracerebral hypocretin administration dose-dependently reinstated drug and food seeking.
- Hypocretin receptor 1 antagonism blocked stress-induced reinstatement.
- Hypocretin is critical for cocaine sensitization via NMDA receptors in the ventral tegmental area.
Conclusions:
- Activation of hypocretin neurons plays a key role in addiction development.
- The hypocretinergic system influences addictive behavior through brain sensitization and reward system modulation.
- Targeting the hypocretinergic system may offer a novel strategy for preventing drug seeking relapse.
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