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Related Experiment Videos

Environmental changes modify the expression of Diazepam withdrawal.

Mariela F Pérez1, Laura E Maglio, Gerardo R Marchesini

  • 1Departamento de Farmacologi;a, Facultad de Ciencias Qui;micas, Universidad Nacional de Córdoba, Argentina.

Behavioural Brain Research
|October 19, 2002
PubMed
Summary

Contextual cues influence Diazepam (DZ) tolerance and withdrawal. Environmental changes can reverse DZ tolerance and dependence, suggesting a shared neural system for these effects.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Early research indicated a link between hippocampal synaptic plasticity and Diazepam (DZ) tolerance.
  • Contextual pre-exposure to DZ impairs hippocampal synaptic plasticity and tolerance development.
  • These findings suggest context-specific tolerance to DZ and hippocampal involvement in conditioned tolerance.

Purpose of the Study:

  • To investigate the role of drug administration context in DZ tolerance and withdrawal.
  • To examine the relationship between hippocampal plasticity, anxiety, and locomotor activity in chronic DZ treatment.
  • To determine if environmental context influences the behavioral expression of DZ dependence.

Main Methods:

  • Chronic Diazepam (DZ) administration to animals for 18 days.

Related Experiment Videos

  • Assessment of withdrawal signs using an elevated plus maze to measure anxiety.
  • Evaluation of long-term potentiation (LTP) threshold in the hippocampal formation.
  • Manipulation of the drug administration environment to observe effects on behavior and plasticity.

    • Main Results:

    • Chronic DZ treatment led to withdrawal signs (increased anxiety) and facilitated hippocampal LTP.
    • Both withdrawal signs and altered LTP were reversed by changing the drug administration environment.
    • Altering environmental cues also increased locomotor activity in animals not exhibiting anxiety.

    Conclusions:

    • The development of tolerance and dependence on Diazepam (DZ) is strongly influenced by the drug administration context.
    • Environmental cues play a critical role in the behavioral expression of conditioned tolerance and withdrawal.
    • A common neural system likely underlies the conditioned tolerance and dependence on DZ.