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Neurosteroids modulate epileptiform activity and associated high-frequency oscillations in the piriform cortex.

Abstract：

:Allotetrahydrodeoxycorticosterone (THDOC) belongs to a class of pregnane neurosteroidal compounds that enhance brain inhibition by interacting directly with GABAA signaling, mainly through an increase in tonic inhibitory current. Here, we addressed the role of THDOC in the modulation of interictal- and ictal-like activity and associated high-frequency oscillations (HFOs, 80-500 Hz; ripples: 80-200 Hz, fast ripples: 250-500 Hz) recorded in vitro in the rat piriform cortex, a highly excitable brain structure that is implicated in seizure generation and maintenance. We found that THDOC: (i) increased the duration of interictal discharges in the anterior piriform cortex while decreasing ictal discharge duration in both anterior and posterior piriform cortices; (ii) reduced the occurrence of HFOs associated to both interictal and ictal discharges; and (iii) prolonged the duration of 4-aminopyridine-induced, glutamatergic independent synchronous field potentials that are known to mainly result from the activation of GABAA receptors. Our results indicate that THDOC can modulate epileptiform synchronization in the piriform cortex presumably by potentiating GABAA receptor-mediated signaling. This evidence supports the view that neurosteroids regulate neuronal excitability and thus control the occurrence of seizures.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Herrington R,Lévesque M,Avoli M

doi

10.1016/j.neuroscience.2013.10.025

subject

Has Abstract

pub_date

2014-01-03 00:00:00

pages

467-77

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(13)00878-6

journal_volume

256

pub_type

杂志文章

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