Deep Brain Stimulation of the Prelimbic Cortex Disrupts Consolidation of Fear Memories

Abstract

Anxiety disorders pose one of the biggest threats to mental health worldwide, yet current therapeutics have been mostly ineffective due to issues with relapse, efficacy, and toxicit. Deep brain stimulation (DBS) is a promising therapy for treatment-resistant psychiatric disorders including anxiety, but very little is known about the effects of DBS on fear memories. In this study, we used a modified plus-maze discriminative and showed that DBS of the ventromedial prefrontal cortex (vmPFC) was able to disrupt consolidation, but not acquisition or retrieval of fear memories. We validated these results using a standard tone-footshock fear conditioning paradigm. We further demonstrated short-term changes in dopaminergic receptor and c-Fos expression in the ventral hippocampus (vHPC) and established a partial casual role of dopamine 2 receptors in this effect. Lastly, we showed changes in neurotransmitter levels in the vHPC. This study highlights the potential therapeutic effect of vmPFC DBS to treat anxiety disorders.