Region-specific modulation of limbic seizure susceptibility by ovarian steroids

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11120%2F99%3A43903511" target="_blank" >RIV/00216208:11120/99:43903511 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/S0006-8993(99)01858-2" target="_blank" >http://dx.doi.org/10.1016/S0006-8993(99)01858-2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/S0006-8993(99)01858-2" target="_blank" >10.1016/S0006-8993(99)01858-2</a>

Result language

angličtina

Original language name

Region-specific modulation of limbic seizure susceptibility by ovarian steroids

Original language description

Gonadal steroid hormones can markedly affect seizure susceptibility. Ovariohysterectomized female rats given ovarian steroid hormone supplements were used to evaluate the effects of ovarian steroids on epileptiform activity in hippocampal slices in vitro and on flurothyl-induced seizures in vivo. Seizure susceptibility was compared in the entorhinal cortex (EC) and CA1 regions of the hippocampus perfused with Mg2+-free medium, which leads to epileptiform discharges caused by a relief of voltage-dependent NMDA receptor block. After in vivo treatment with 500 mu g of progesterone for 2 h prior to slice preparation, the latency to onset of low Mg2+-induced epileptiform activity of slices was significantly prolonged compared to slices from controls. In contrast, progesterone replacement accelerated the development of epileptiform activity in the CAL region, Neither estrogen alone (2 x 2 mu g of estradiol benzoate, 48 and 24 h prior to the experiment), nor a combined treatment with estrogen plus progesterone, significantly affected seizure susceptibility in either CAI or the EC. There were no consistent effects of estrogen or progesterone, alone or in combination, on flurothyl-induced seizures in vivo. The data suggest that in vitro, progesterone alters seizure susceptibility in a site and seizure model-specific fashion. The differential effects of progesterone may be due to differential expression of progesterone receptor isoforms or metabolites in specific brain areas suggesting that selective modulation of NMDA receptor-dependent epileptiform activity may play a role in hormonal effects on epileptogenesis.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

ED - Physiology

OECD FORD branch

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Project

<a href="/en/project/IZ3613" target="_blank" >IZ3613: Effects of repeated seizures and long-term antiepileptic therapy on brain morphology and function</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

1999

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Brain Research

ISSN

0006-8993

e-ISSN

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Volume of the periodical

842

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

7

Pages from-to

132-138

UT code for WoS article

000082809300015

EID of the result in the Scopus database

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