AI Insight
This study examined how chronic restraint stress affects brain circuitry, behavior, and hormonal responses in a mouse model of Dravet syndrome, a severe genetic epilepsy. Researchers found that stressed Dravet syndrome mice showed elevated corticosterone levels, increased anxiety-like behavior, higher mortality in females, and distinct changes in synaptic transmission within corticotropin-releasing factor neurons of the bed nucleus of the stria terminalis, a brain region involved in stress and epilepsy. Specifically, chronic stress altered both excitatory and inhibitory synaptic activity in this region more strongly in Dravet syndrome mice than in controls, suggesting a maladaptive remodeling of stress-responsive circuits in the epileptic brain.
Why it matters
These findings support the clinical observation that stress worsens seizure outcomes and may contribute to psychiatric comorbidities in epilepsy patients, pointing toward stress-responsive brain circuits as potential therapeutic targets for improving quality of life in individuals with Dravet syndrome and possibly other epilepsies.
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Stress is a commonly reported seizure precipitant and may contribute to the development of psychiatric comorbidities in epilepsy, yet how chronic stress interacts with epileptic circuits remains poorly understood. We investigated the impact of chronic restraint stress on physiological, behavioral, and synaptic outcomes in a mouse model of Dravet syndrome, specifically corticotropin-releasing factor (CRF) neurons in the bed nucleus of the stria terminalis (BNST), a stress-responsive region implicated in epilepsy patients. Chronic stress produced divergent hypothalamic-pituitary-adrenal axis responses, with stressed Dravet syndrome mice exhibiting elevated corticosterone, increased mortality in females, and increased locomotion and anxiety-like behavior. Ex vivo electrophysiological recordings revealed that chronic stress increased spontaneous excitatory event frequency onto BNST CRF neurons in both genotypes and selectively increased sEPSC and sIPSC amplitude in Dravet syndrome mice. Evoked recordings demonstrated genotype-specific effects of stress on glutamatergic transmission in CRF neurons of the DS group. This suggests greater stress-dependent remodeling of spontaneous and evoked synaptic activity in DS. These findings suggest chronic stress may worsen physiological and behavioral outcomes in Dravet syndrome and promote specific maladaptive alterations in BNST CRF circuitry. More broadly, these results suggest that stress interacts with seizure vulnerability and potentially contributes to neuropsychiatric comorbidities and epilepsy.