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Related Experiment Videos

Intra- and interstrain differences in models of "behavioral despair".

F Bai1, X Li, M Clay

  • 1Lilly Research Laboratories, Eli Lilly and Co., Lilly Corporate Center, DC 0510, Indianapolis, IN 46285-0510, USA. bai_fengju@lilly.com

Pharmacology, Biochemistry, and Behavior
|November 10, 2001
PubMed
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The forced swim test (FST) and tail suspension test (TST) reveal distinct neurochemical pathways. Mouse strain differences highlight that these behavioral tests are not interchangeable for studying depression models.

Area of Science:

  • Neuroscience
  • Behavioral Pharmacology
  • Animal Models

Background:

  • The forced swim test (FST) and tail suspension test (TST) are widely used to assess antidepressant-like behavior in rodents.
  • Understanding the neurobiological underpinnings of these tests is crucial for accurate interpretation of results.

Purpose of the Study:

  • To compare baseline and drug-induced performance in the FST and TST across two mouse strains (C57Bl/6 and NIH-Swiss).
  • To investigate potential differences in the biological substrates mediating performance in these two behavioral tests.

Main Methods:

  • Evaluation of baseline immobility in C57Bl/6 and NIH-Swiss mice using FST and TST.
  • Assessment of drug effects (imipramine and LY451646) on behavior in FST and TST.
  • Intra- and interstrain comparisons of behavioral responses.

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Main Results:

  • Significant differences in baseline immobility were observed between FST and TST in NIH-Swiss mice, but not in C57Bl/6 mice.
  • Imipramine exhibited a "U-shaped" dose-response curve in the FST for C57Bl/6 mice, but not in the TST.
  • The AMPA receptor potentiator LY451646 showed strain-dependent potency differences in the FST, influenced by pharmacokinetic and pharmacodynamic factors.

Conclusions:

  • The neurochemical pathways underlying performance in the FST and TST are not identical.
  • Strain-specific differences in behavioral responses suggest distinct biological substrates for each test.
  • These findings challenge the assumption of interchangeable utility between FST and TST in behavioral pharmacology.