Animal models of obsessive-compulsive disorder

Area of Science:

• Neuroscience
• Pharmacology
• Behavioral Science

Background:

• Obsessive-compulsive disorder (OCD) affects many individuals, yet current treatments have limited efficacy and significant side effects.
• The development of novel therapeutic agents for OCD is hindered by a lack of predictive in vivo models.
• Existing animal models may not accurately reflect the complexities of OCD symptomology or treatment response.

Purpose of the Study:

• To introduce and evaluate two novel in vivo behavioral assays for their potential in predicting the efficacy of OCD treatments.
• To assess the utility of marble burying and nestlet shredding behaviors as screening tools for new OCD medications.
• To differentiate between compounds with potential therapeutic effects and those causing motor impairment.

Main Methods:

• Utilized marble burying and nestlet shredding, spontaneous repetitive behaviors in mice, as acute in vivo assays.
• Administered selective serotonin reuptake inhibitors (SSRIs) and benzodiazepine anxiolytics to assess their effects on these behaviors.
• Evaluated drug-induced motor side effects using a rotating rod test to assess walking behavior.

Main Results:

• Selective serotonin reuptake inhibitors effectively reduced marble burying and nestlet shredding behaviors without causing motor deficits.
• Benzodiazepine anxiolytics only impacted these behaviors at doses that also impaired motor function.
• The assays demonstrated sensitivity to known classes of psychoactive drugs relevant to OCD treatment.

Conclusions:

• Marble burying and nestlet shredding assays in mice offer a predictive in vivo method for evaluating potential OCD treatments.
• These behavioral models can help distinguish between compounds with genuine therapeutic potential and those causing motor side effects.
• These assays represent a valuable tool to advance the discovery of novel chemical solutions for OCD symptoms.