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Investigating Drivers of Antireward in Addiction Behavior with Anatomically Specific Single-Cell Gene Expression Methods

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Multiple roles for orexin/hypocretin in addiction.

Stephen V Mahler¹, Rachel J Smith, David E Moorman

¹Department of Neurosciences, Medical University of South Carolina, Charleston, SC, USA.

Progress in Brain Research

|July 21, 2012

Summary

Orexins (hypocretins) are key hypothalamic peptides influencing arousal and wakefulness. This review highlights their critical role in drug addiction, particularly in cue- and stress-induced drug seeking behaviors.

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Area of Science:

Neuroscience
Addiction Research
Behavioral Pharmacology

Background:

Orexins (hypocretins) are hypothalamic peptides regulating arousal and wakefulness.
These peptides also play a significant role in reward-related behaviors and drug addiction.

Purpose of the Study:

To review the role of orexins in various animal models of drug addiction.
To examine orexin's involvement in seeking major classes of abused drugs and food.
To discuss the neuronal circuits and neurochemical interactions underlying orexin's effects on addiction.

Main Methods:

Literature review of animal models of drug addiction.
Analysis of orexin's involvement in seeking various drugs and food.
Discussion of functional neuronal circuits, focusing on ventral tegmental area (VTA) orexin-glutamate interactions.

Main Results:

Orexins are implicated in drug seeking behaviors across different drug classes and food.
A common finding is orexin involvement in drug seeking triggered by external stimuli like cues, contexts, and stressors.
Orexin and glutamate interactions in the VTA are crucial for mediating addiction-related behaviors.

Conclusions:

Orexins are critical neuromodulators in addiction, influencing motivated behaviors towards drugs and food.
External stimuli play a significant role in orexin-mediated drug seeking.
Despite their limited neuronal population, orexins exert widespread behavioral effects through specific neuronal circuits.