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Related Experiment Videos

Conditioned tolerance provides protection against ethanol lethality.

C L Melchior1

  • 1Brentwood Division Research, West Los Angeles Veterans Administration, CA 90073.

Pharmacology, Biochemistry, and Behavior
|September 1, 1990
PubMed
Summary

Conditioned drug tolerance, induced by repeated ethanol exposure in mice, protected against lethal ethanol doses. Testing in the familiar environment, associated with ethanol administration, significantly increased the lethal dose 50 (LD50).

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Toxicology

Background:

  • Drug tolerance is a critical factor in drug efficacy and safety.
  • Environmental cues can influence drug responses, a phenomenon known as conditioned tolerance.
  • Ethanol's lethality is a significant concern in toxicology and addiction research.

Purpose of the Study:

  • To investigate the protective effect of conditioned tolerance against ethanol-induced lethality in mice.
  • To determine if the environment associated with ethanol administration influences its lethal dose.

Main Methods:

  • Mice received twice-daily injections of ethanol (3.5 g/kg) for four days.
  • On the fifth day, mice were tested for ethanol lethality in either the familiar environment or a novel environment.

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  • Lethal dose 50 (LD50) was calculated for ethanol in both conditions.

    • Main Results:

    • The LD50 for ethanol was significantly higher in mice tested in the environment previously associated with ethanol administration.
    • Mice tested in a novel environment exhibited a lower LD50 for ethanol.
    • Conditioned tolerance demonstrated a protective effect against acute ethanol toxicity.

    Conclusions:

    • Environmental context plays a crucial role in the development and expression of conditioned drug tolerance.
    • Conditioned tolerance to ethanol can confer significant protection against its lethal effects.
    • These findings have implications for understanding drug dependence and overdose risk.