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The chick separation stress paradigm: a validation study.

Matt W Feltenstein1, Jason E Warnick, Amanda N Guth

  • 1Department of Psychology, University of Mississippi, Oxford, MS 38677, USA.

Pharmacology, Biochemistry, and Behavior
|January 31, 2004
PubMed
Summary
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This study validates a chick model for high-throughput anxiolytic screening. The model effectively identifies anxiety-reducing drugs while ignoring non-anxiolytic compounds, enhancing its utility in drug discovery.

Area of Science:

  • Pharmacology
  • Neuroscience
  • Animal Models

Background:

  • The chick separation stress paradigm is a valuable tool for studying anxiety.
  • Expanding its generalizability as a high-throughput anxiolytic screen is crucial for drug discovery.

Purpose of the Study:

  • To validate the chick separation stress paradigm as a high-throughput anxiolytic screen.
  • To assess the sensitivity and specificity of the screen using known positive and negative drug probes.

Main Methods:

  • Seven-day-old chicks were tested under low-stress (mirror) and high-stress (no-mirror) conditions.
  • Drugs were administered intramuscularly 15 minutes prior to a 3-minute observation period.
  • Dependent measures included distress vocalizations (anxiety) and sleep onset latency (sedation).

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Main Results:

  • Positive drug probes (meprobamate, pentobarbital, chlordiazepoxide, clonidine, imipramine) dose-dependently reduced distress vocalizations, except buspirone.
  • Most positive probes also affected sleep onset latency dose-dependently, with anxiolytic effects exceeding sedative effects.
  • Negative drug probes (amphetamine, scopolamine, caffeine, chlorpromazine, haloperidol) did not significantly alter distress vocalizations or sleep onset latency, except for high-dose amphetamine-induced stereotypy.

Conclusions:

  • The chick separation stress paradigm is a sensitive and specific high-throughput screen for anxiolytic compounds.
  • The model effectively distinguishes between anxiolytic and non-anxiolytic drugs, supporting its use in preclinical anxiolytic research.