Sex differences in a rabbit eyeblink conditioning model of PTSD

Area of Science:

• Neuroscience
• Behavioral Science
• Psychiatry

Background:

• Posttraumatic stress disorder (PTSD) affects individuals differently based on sex.
• Existing animal models of PTSD predominantly utilize male subjects.
• Sex-based differences in stress vulnerability are noted, with males often showing greater susceptibility in animal studies.

Purpose of the Study:

• To develop and validate a rabbit model for studying posttraumatic stress disorder (PTSD) in female subjects.
• To investigate sex differences in the development of PTSD core features, including hyperarousal and conditioned responses.
• To assess the efficacy of treatments for PTSD-related symptoms in female rabbits.

Main Methods:

• Development of a rabbit model for PTSD.
• Utilizing eyeblink conditioning by pairing auditory cues with periorbital shock.
• Comparing conditioning acquisition, hyperarousal, and treatment response between male and female rabbits.

Main Results:

• Both male and female rabbits achieved similar levels of conditioned responding.
• Female rabbits exhibited significantly higher levels of hyperarousal post-conditioning.
• Females appeared to respond more favorably to therapeutic interventions compared to males.

Conclusions:

• The rabbit model effectively recapitulates key PTSD features like hyperarousal and conditioned responses.
• Female rabbits display distinct stress responses and treatment sensitivities within this PTSD model.
• Expanding PTSD animal models to include females is crucial for understanding sex differences and developing targeted therapies.