Alcohol use disorders (AUDS) impact millions of individuals and constitute one of the most serious public health problems worldwide. Despite its devastating impact on society, only a few effective medications are currently available. Orexins/hypocretins are hypothalamic peptides that act via orexin receptors that have been linked to regulating feeding and sleep. In addition, the orexin system has been shown to play an important role in alcohol self-administration and in stress-induced reinstatement. These effects are thought to be mediated by orexin containing neurons that project from the lateral hypothalamus to the ventral tegmental area (VTA) and nucleus accumbens (NAc) or from the perifornical regions to the amygdala respectively. However, the role of orexins through orexin receptors and their signaling pathway in driving ethanolmediated behaviors is less explored. The overall goal of this research project, component 6 of the NIAAAGallo Center application is to determine the role of orexins, orexin receptors and their downstream signaling pathways in different brain regions in ethanol-mediated behaviors. The Center provides a unique opportunity to apply a multidisciplinary approach that integrates behavioral, biochemical and electrophysiological techniques in the latest animal models of binge drinking, ethanol selfadministration and stress-induced reinstatement.
The research aims to understand the role of orexinmediated synaptic and cellular mechanisms in the central amygdala, VTA and NAc using behavioral models of alcohol addiction.
In Aim 6. 1, we will determine whether Ox-Rs in the central amygdala drive stress-induced reinstatement of ethanol seeking.
In Aim 6. 2, we will apply electrophysiological and biochemical techniques to dissect the signaling pathways underlying orexins effects in the central amygdala.
In Aim 6. 3, we will determine the mechanism of action of orexins in the VTA and the NAc in regulating binge ethanol consumption and ethanol self-administration. Orexins/hypocretins play a crucial role in addiction, the sleep-wake cycle, motivation and stress, and this provides a strong rationale for our proposed studies, the experiments outlined have been designed specifically to lead to clinical studies aimed at determining the efficacy of orexin receptor antagonists in human subjects with AUDs.

Public Health Relevance

Orexin receptors are novel therapeutic targets implicated in alcohol use disorders (AUDs) and orexin receptor antagonists are currently in Phase III clinical trials for sleep disorders. There is little known about how orexin receptors drive ethanol consumption and stress-induced reinstatement. This project provides a unique opportunity to determine the mechanism of action of orexin receptors in AUDs

Agency
National Institute of Health (NIH)
Institute
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
Type
Specialized Center (P50)
Project #
2P50AA017072-06
Application #
8401572
Study Section
Special Emphasis Panel (ZAA1-GG (50))
Project Start
Project End
Budget Start
2013-07-01
Budget End
2014-06-30
Support Year
6
Fiscal Year
2013
Total Cost
$294,902
Indirect Cost
$116,282
Name
Ernest Gallo Clinic and Research Center
Department
Type
DUNS #
173995366
City
Emeryville
State
CA
Country
United States
Zip Code
94608
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