Submissive behavior in mice as a test for antidepressant drug activity

Area of Science:

• Neuroscience
• Pharmacology
• Behavioral Science

Background:

• The reduction of submissive behavior model (RSBM) in rats is a validated model for studying clinical depression.
• Extending depression models to mice is crucial for broader research and drug development.

Purpose of the Study:

• To develop and validate a mouse model for clinical depression based on the established rat RSBM.
• To assess the efficacy of various antidepressant drugs and other agents in modulating submissive behavior in mice.

Main Methods:

• Submissive mice were identified through behavioral testing.
• Mice were administered antidepressant drugs (imipramine, desipramine, amoxapine, fluoxetine), amphetamine, yohimbine, diazepam, and thiothixen.
• Changes in competitive behavior and dominance levels were measured.

Main Results:

• Imipramine, desipramine, amoxapine, and fluoxetine significantly increased competitive behavior in submissive mice.
• Amphetamine also reduced submissive behavior, while yohimbine and diazepam had no effect.
• The neuroleptic drug thiothixen demonstrated antidepressant-like effects in the mouse model.

Conclusions:

• The developed mouse model effectively mimics responses to antidepressants observed in the rat RSBM.
• This mouse model shows promise as a valuable tool for preclinical depression research and antidepressant screening.
• The findings support the utility of the mouse RSBM for investigating depression mechanisms and therapeutic interventions.