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Related Experiment Videos

Nicotine-induced acute tolerance: studies involving schedule-controlled behavior

J A Rosecrans1, J L Wiley, C E Bass

  • 1Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond 23298, USA.

Brain Research Bulletin
|January 1, 1995
PubMed
Summary

A single dose of nicotine can create acute tolerance to its own disruptive effects on rat behavior. This tolerance appears to be primarily pharmacological, not behavioral, suggesting receptor desensitization.

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Area of Science:

  • Neuroscience
  • Behavioral Pharmacology

Background:

  • Nicotine is a psychoactive stimulant with complex effects on behavior.
  • Understanding acute tolerance to nicotine is crucial for its study in neuroscience and addiction research.

Purpose of the Study:

  • To investigate acute tolerance to nicotine-induced disruption of operant behavior in rats.
  • To differentiate between pharmacological and behavioral mechanisms of acute nicotine tolerance.

Main Methods:

  • Rats were trained on a fixed ratio-30 schedule for food reinforcement.
  • A priming dose of nicotine (0.8 mg/kg) was administered noncontingently in home cages.
  • After a delay, a challenge dose of nicotine (0.4 mg/kg) was administered before a behavioral evaluation.

Main Results:

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  • The priming dose of 0.8 mg/kg nicotine induced acute tolerance to the response-rate-decreasing effects of a subsequent 0.4 mg/kg nicotine challenge.
  • Tolerance was observed even when the priming dose was given outside the operant testing environment.

Conclusions:

  • Acute tolerance to nicotine's behavioral effects can occur following a single, noncontingent injection.
  • The observed tolerance is likely pharmacological, potentially involving desensitization of central nicotinic acetylcholine receptors (nAChRs).