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Ethanol-associated behaviors of mice lacking norepinephrine
D Weinshenker1, N C Rust, N S Miller
1Howard Hughes Medical Institute and Department of Biochemistry, University of Washington, Seattle, Washington 98195, USA.
Summary
Norepinephrine (NE) depletion in mice reduces ethanol preference and increases sensitivity to its sedative effects. This suggests NE plays a key role in modulating alcohol consumption and responses.
Area of Science:
- Neuroscience
- Pharmacology
- Genetics
Background:
- Norepinephrine's (NE) role in ethanol consumption is unclear, with conflicting results from previous studies.
- Animal models have implicated NE in alcohol use, but its precise influence remains elusive.
Purpose of the Study:
- To genetically determine the effect of NE depletion on ethanol-mediated behaviors.
- To investigate the specific role of NE synthesis in alcohol preference and physiological responses.
Main Methods:
- Utilized dopamine beta-hydroxylase knockout (Dbh -/-) mice lacking NE synthesis.
- Assessed ethanol preference using a two-bottle choice paradigm.
- Examined ethanol-conditioned taste aversion and sensitivity to ethanol's sedative and hypothermic effects.
Main Results:
- Dbh -/- mice exhibited reduced ethanol preference and delayed aversion extinction.
- Both male and female Dbh -/- mice showed hypersensitivity to ethanol's sedative and hypothermic effects.
- Sedation was reversed by NE replacement, indicating NE's direct role; body temperature and metabolism were not explanatory factors.
Conclusions:
- Norepinephrine significantly modulates ethanol-related behaviors, including consumption and aversion.
- NE depletion leads to increased sensitivity to ethanol's physiological effects, such as sedation and hypothermia.
- Genetic NE deficiency impacts alcohol's rewarding and aversive properties, highlighting NE's critical role in alcohol's central effects.