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Related Experiment Videos

A new alcohol antagonist: phaclofen.

A M Allan1, R A Harris

  • 1Department of Psychiatry Washington University School of Medicine Saint Louis, MO 63110.

Life Sciences
|January 1, 1989
PubMed
Summary

Phaclofen, a GABA-B receptor antagonist, reduced ethanol

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Area of Science:

  • Neuropharmacology
  • Behavioral Neuroscience

Background:

  • Ethanol's effects are complex and involve multiple neurotransmitter systems.
  • The GABAergic system, particularly GABA-B receptors, is implicated in ethanol's actions.

Purpose of the Study:

  • To investigate the role of GABA-B receptors in mediating ethanol's behavioral effects.
  • To determine if phaclofen, a GABA-B antagonist, can alter ethanol-induced behaviors.

Main Methods:

  • Evaluated ethanol's effects on righting reflex (sleep time), motor coordination (bar holding), locomotion (open field), and hypothermia.
  • Administered phaclofen (GABA-B antagonist) prior to ethanol exposure.
  • Assessed phaclofen's effects on pentobarbital- and diazepam-induced motor incoordination.

Main Results:

  • Phaclofen significantly reduced ethanol's effects on motor incoordination, locomotion, and hypothermia.
  • Phaclofen did not affect motor incoordination induced by pentobarbital or diazepam.
  • Phaclofen showed a slight increase in the ED50 for ethanol-induced loss of righting reflex but did not alter duration or blood ethanol levels at awakening.

Conclusions:

  • The GABA-B system appears to mediate several key actions of ethanol.
  • Phaclofen's rapid inactivation may limit its ability to antagonize long-duration ethanol effects.
  • These findings highlight the involvement of GABA-B receptors in ethanol's neurobehavioral impact.

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