The Neurosteroid Environment in the Hippocampus Exerts Bi-Directional Effects on Seizure Susceptibility in Mice

September 2008 in “ Brain Research ”

Katherine R. Gililland-Kaufman, Michelle A. Tanchuck, Matthew M. Ford, John C. Crabbe, Amy S. Beadles-Bohling, Christopher Snelling, Gregory P. Mark, Deborah A. Finn

allopregnanolone GABAA receptors finasteride neurosteroids ethanol withdrawal ALLO GABA receptors FIN EtOH withdrawal

TLDR Neurosteroids in the brain can increase or decrease seizure risk in mice.

The study explored the effects of neurosteroids in the hippocampus on seizure susceptibility in mice, focusing on allopregnanolone (ALLO) and its interaction with GABAA receptors. It found that ALLO had anticonvulsant effects, raising the threshold for seizures, while finasteride (FIN), which reduces ALLO levels, had proconvulsant effects. During ethanol (EtOH) withdrawal, mice showed reduced sensitivity to ALLO's anticonvulsant effects, suggesting altered GABAA receptor sensitivity. The study, involving 43 mice, highlighted the significant impact of hippocampal neurosteroid levels on seizure susceptibility and the effects of EtOH withdrawal.