Extracellular magnesium and anticonvulsant effects of valproate in young rat hippocampus.

Abstract:

:Extracellular field potential recordings were made in CA3 subfield of hippocampal slices from rats aged 11-22 days. In these experiments, we analyzed the effects induced by modifying [Mg2+] in the medium (1 or 2 mM) on (a) 4-aminopyridine (4-AP, 50 microM)-induced synchronous events (including ictal- and interictal-like epileptiform discharges as well as gamma-aminobutyric acid (GABA)-mediated potentials), and (b) the changes induced by the antiepileptic drug (AED) valproate (VPA 2 mM) on such activities. Changing [Mg2+] from 1 to 2 mM induced age-dependent effects consisting of reduction in rate of occurrence of ictal-like discharges at 11-13 days (55% reduction, p < 0.005) and 14-16 days (46% reduction, p < 0.025) postpartum. At any age, the rate of occurrence and the amplitude of the GABA-mediated synchronous potentials tended to decrease in 1 mM [Mg2+]. Similar effects were noted when changes in [Mg2+] were made during continuous application of the competitive antagonist of the N-methyl-D-aspartate (NMDA) receptor DL-2-amino-5-phosphonovalerate (APV 50 microM). As previously reported, interictal and ictal discharges were blocked by addition of VPA to medium containing 2 mM [Mg2+]. Such an effect was not observed when [Mg2+] was decreased to 1 mM. In 1 mM, but not in 2 mM [Mg2+], VPA increased the amplitude of GABA-mediated synchronous potentials. Our results indicate that [Mg2+] plays a role in modulating occurrence of 4-AP-induced ictal activity and that it can influence the effects of VPA in this in vitro model of epileptogenesis.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Epilepsia

journal_title

Epilepsia

authors

Fueta Y,Siniscalchi A,Tancredi V,Avoli M

doi

10.1111/j.1528-1157.1995.tb01016.x

subject

Has Abstract

pub_date

1995-04-01 00:00:00

pages

404-9

issue

4

eissn

0013-9580

issn

1528-1167

journal_volume

36

pub_type

杂志文章
  • Basal temporal subdural electrodes in the evaluation of patients with intractable epilepsy.

    abstract::In evaluation of patients with complex partial seizures who are candidates for surgical treatment, exact definition of the epileptogenic focus is essential for a good surgical outcome. We report a new technique which permits detailed mapping of the epileptogenic activity in the basal temporal lobe and the convexity of...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1989.tb05445.x

    authors: Lüders H,Hahn J,Lesser RP,Dinner DS,Morris HH 3rd,Wyllie E,Friedman L,Friedman D,Skipper G

    更新日期:1989-03-01 00:00:00

  • Positron emission tomography with [11C]deuterium-deprenyl in temporal lobe epilepsy.

    abstract::We performed positron emission tomography (PET) with [11C]deuterium-deprenyl in 9 patients with temporal lobe epilepsy (TLE) undergoing evaluation for possible epilepsy surgery. Seven patients had unilateral and 2 had bilateral mesiotemporal epileptic foci based on the preoperative investigation including ictal EEG di...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1995.tb01051.x

    authors: Kumlien E,Bergström M,Lilja A,Andersson J,Szekeres V,Westerberg CE,Westerberg G,Antoni G,Långström B

    更新日期:1995-07-01 00:00:00

  • Phasic GABAA -receptor activation is required to suppress epileptiform activity in the CA3 region of the immature rat hippocampus.

    abstract:PURPOSE:  Despite the consistent observation that γ-aminobutyric acid A (GABA(A) ) receptors mediate excitatory responses at perinatal stages, the role of the GABAergic system in the generation of neonatal epileptiform activity remains controversial. Therefore, we analyzed whether tonic and phasic GABAergic transmissio...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1167.2012.03442.x

    authors: Kolbaev SN,Sharopov S,Dierkes PW,Luhmann HJ,Kilb W

    更新日期:2012-05-01 00:00:00

  • Current treatment of myoclonic astatic epilepsy: clinical experience at the Children's Hospital of Philadelphia.

    abstract:PURPOSE:Myoclonic astatic epilepsy (MAE) is a generalized epilepsy of early childhood. Little is known about the use of newer antiepileptic treatments (AET) in MAE. The purpose of this study was to describe the characteristics, treatment, and outcome of a contemporary MAE cohort exposed to the new generation AET. METH...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1167.2007.01186.x

    authors: Kilaru S,Bergqvist AGC

    更新日期:2007-09-01 00:00:00

  • A definition and classification of status epilepticus--Report of the ILAE Task Force on Classification of Status Epilepticus.

    abstract::The Commission on Classification and Terminology and the Commission on Epidemiology of the International League Against Epilepsy (ILAE) have charged a Task Force to revise concepts, definition, and classification of status epilepticus (SE). The proposed new definition of SE is as follows: Status epilepticus is a condi...

    journal_title:Epilepsia

    pub_type: 历史文章,杂志文章,评审

    doi:10.1111/epi.13121

    authors: Trinka E,Cock H,Hesdorffer D,Rossetti AO,Scheffer IE,Shinnar S,Shorvon S,Lowenstein DH

    更新日期:2015-10-01 00:00:00

  • The axial spasm--the predominant type of drop seizure in patients with secondary generalized epilepsy.

    abstract::In 45 patients suffering from secondary generalized epilepsy, we have recorded 239 drop seizures both by radio-telemetered EEG/split-screen video taping and polygraphically. Twenty of these patients had pure tonic drop seizures. Nine patients each had myoclonic-atonic or pure atonic seizures, whereas seven had slow fa...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1985.tb05671.x

    authors: Egli M,Mothersill I,O'Kane M,O'Kane F

    更新日期:1985-09-01 00:00:00

  • Localization of lesions by neuropsychological testing.

    abstract::Neuropsychological evaluation differs from other methods used to localize cerebral lesions in that it analyzes cognitive function. Tests sample widely among cognitive abilities, contrasting language proficiency with visuospatial skills. A thorough assessment of memory is crucial in the investigation because of the pro...

    journal_title:Epilepsia

    pub_type: 杂志文章,评审

    doi:

    authors: Jones-Gotman M

    更新日期:1991-01-01 00:00:00

  • The natural history of untreated epilepsy in a rural community in Africa.

    abstract::The duration of epilepsy was evaluated in over 460 previously untreated patients who attended newly established epilepsy clinics in a rural area of Malawi. The mean duration at first attendance was 6.5 years. It was found that as the duration of active epilepsy increased, the number of patients having epilepsy of a gi...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1992.tb01692.x

    authors: Watts AE

    更新日期:1992-05-01 00:00:00

  • Dipropylacetic acid (Depakine) in experimental epilepsy in the alert cat.

    abstract::The effect od dipropylacetic acid (DPA; Depakine) on the bemegride-induced convulsive threshold was investigated in alert cats. Forty-five min after DPA 200 mg/kg, s.c., no significant effect was obtained; 5 min after the same dose iv., protection from bemegride-induced seizures was pronounced. DPA did not decrease fo...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1975.tb04724.x

    authors: van Duijn H,Beckmann MK

    更新日期:1975-03-01 00:00:00

  • Prenatal nicotine and CNS development.

    abstract::The teratological effect of nicotine has been studied during different trimesters of pregnancy. Three groups of pregnant albino Swiss mice were used for each trimester. The daily doses of nicotine base used were equivalent to 10 (900 micrograms/kg), 20 (1,800 micrograms/kg), or 30 (2,700 micrograms/kg) cigarettes. The...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1985.tb05708.x

    authors: Al-Hachim GM,Mahmoud FA

    更新日期:1985-11-01 00:00:00

  • Major patterns of human inheritance: relevance to the epilepsies.

    abstract::An understanding of the basic principles of human inheritance patterns is necessary to appreciate the variety and complexity of genetic influences in the epilepsies. The various modes of human inheritance include single gene (mendelian), chromosomal, mitochondrial, and multifactorial/polygenic. Recent insights regardi...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1994.tb05924.x

    authors: Bird TD

    更新日期:1994-01-01 00:00:00

  • Acute effects of vigabatrin on brain GABA and homocarnosine in patients with complex partial seizures.

    abstract:PURPOSE:The acute, subacute, and chronic effects of vigabatrin (VGB) were studied in patients with refractory complex partial seizures. VGB increases human brain gamma-aminobutyric acid (GABA) and the related metabolites, homocarnosine and 2-pyrrolidinone. METHODS:In vivo measurements of GABA and homocarnosine were ma...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1999.tb00803.x

    authors: Petroff OA,Hyder F,Collins T,Mattson RH,Rothman DL

    更新日期:1999-07-01 00:00:00

  • Ictal and interictal activity in partial epilepsy recorded with multichannel magnetoelectroencephalography: correlation of electroencephalography/electrocorticography, magnetic resonance imaging, single photon emission computed tomography, and positron em

    abstract::Ictal and interictal epileptic activity was recorded for the first time by multichannel magnetoencephalography (MEG) in three patients with partial epilepsy. Pre- and intra-operative localization of the epileptogenic region was compared. The interictal epileptic activity was localized at the same region of the tempora...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1992.tb02195.x

    authors: Stefan H,Schneider S,Feistel H,Pawlik G,Schüler P,Abraham-Fuchs K,Schlegel T,Neubauer U,Huk WJ

    更新日期:1992-09-01 00:00:00

  • Brain perfusion following single seizures.

    abstract:PURPOSE:The aim of this study was to assess the regional relative interictal and postictal perfusion changes in temporal and parietal lobe epilepsy. METHODS:We investigated interictal and postictal magnet resonance perfusion changes in five patients with temporal lobe epilepsy either with hippocampal sclerosis (n = 3)...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1167.2005.00336.x

    authors: Leonhardt G,de Greiff A,Weber J,Ludwig T,Wiedemayer H,Forsting M,Hufnagel A

    更新日期:2005-12-01 00:00:00

  • Rapid astrocyte and microglial activation following pilocarpine-induced seizures in rats.

    abstract::Astrocyte and microglial activation occurs following seizures and plays a role in epileptogenesis. However, the precise temporal and spatial response to seizures has not been fully examined. The pilocarpine model of temporal lobe epilepsy was selected to examine glial changes following seizures because morphological c...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1167.2008.01491.x

    authors: Shapiro LA,Wang L,Ribak CE

    更新日期:2008-01-01 00:00:00

  • Tonic phase of a generalized convulsive seizure is an independent predictor of postictal generalized EEG suppression.

    abstract:PURPOSE:To determine the incidence, duration, risk factors for, and clinical correlates of postictal generalized electroencephalography (EEG) suppression (PGES), and to further delineate the significance of PGES in the pathogenesis of sudden unexpected death in epilepsy (SUDEP). METHODS:We retrospectively reviewed the...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/epi.12094

    authors: Tao JX,Yung I,Lee A,Rose S,Jacobsen J,Ebersole JS

    更新日期:2013-05-01 00:00:00

  • A study of the pharmacokinetics of phenytoin (diphenylhydantoin) in epileptic patients, and the development of a nomogram for making dose increments.

    abstract::Phenytoin is metabolized to its parahydroxylated derivative by hepatic microsomal enzymes. This hydroxylation is a saturable process, that is, the rate of metabolism fails to increase in proportion to the serum concentration. This leads to a nonlinear relationship between the maintenance dose of the drug and the resul...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1975.tb04745.x

    authors: Richens A

    更新日期:1975-11-01 00:00:00

  • The natural history of epilepsy in tuberous sclerosis complex.

    abstract:BACKGROUND:Although epilepsy affects most patients with tuberous sclerosis complex (TSC), little is known about the natural history of epilepsy in this genetic disease. METHODS:A retrospective chart review of all patients with TSC seen between January 2002 and October 2008. Charts were reviewed for a history of infant...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1167.2009.02474.x

    authors: Chu-Shore CJ,Major P,Camposano S,Muzykewicz D,Thiele EA

    更新日期:2010-07-01 00:00:00

  • Infantile spasms in Down syndrome: good response to a short course of vigabatrin.

    abstract:PURPOSE:To evaluate the efficacy of vigabatrin (VGB) in the treatment of infantile spasms (ISs) associated with Down syndrome (DS) and to assess the feasibility of early discontinuation to reduce the possible retinal toxicity. METHODS:Five children with ISs with DS were treated with vigabatrin as first-line monotherap...

    journal_title:Epilepsia

    pub_type: 临床试验,杂志文章

    doi:10.1046/j.1528-1157.2001.13501.x

    authors: Nabbout R,Melki I,Gerbaka B,Dulac O,Akatcherian C

    更新日期:2001-12-01 00:00:00

  • The interictal language profile in adult epilepsy.

    abstract:OBJECTIVE:The purpose of this study was to systematically review the literature on the interictal language profile in adult patients with epilepsy. METHODS:An extensive literature search was performed using MEDLINE, Embase, PsycINFO, Cochrane Central Register of Controlled Trials, PASCAL, and PSYNDEXplus databases. Ke...

    journal_title:Epilepsia

    pub_type: 杂志文章,评审

    doi:10.1111/epi.12743

    authors: Bartha-Doering L,Trinka E

    更新日期:2014-10-01 00:00:00

  • Operative posterior disconnection in epilepsy surgery: Experience with 29 patients.

    abstract:OBJECTIVE:It has been suggested that multilobar epilepsies caused by lesions restricted to the posterior cerebral quadrant (ie, the parietal, temporal, and occipital lobes) can be treated successfully by a procedure termed posterior disconnection. The objective of the present paper was to identify determinants of the e...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/epi.16318

    authors: Kalbhenn T,Cloppenborg T,Wörmann FG,Blümcke I,Coras R,May TW,Polster T,Simon M,Bien CG

    更新日期:2019-09-01 00:00:00

  • Kentuckians' attitudes toward children with epilepsy.

    abstract::We explored Kentuckians' attitudes toward children with epilepsy. Questions compared respondents' attitudes about children with epilepsy, asthma, hyperactivity, and AIDS. Random digit dialing led to 617 completed interviews. The key questions asked concerned (a) how a pupil with each illness would alter the classroom ...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1995.tb00959.x

    authors: Baumann RJ,Wilson JF,Wiese HJ

    更新日期:1995-10-01 00:00:00

  • Retrospective multiinstitutional study of the prevalence of early death in Dravet syndrome.

    abstract:PURPOSE:A questionnaire survey was conducted in Japan to investigate the causes and prevalence of death related to Dravet syndrome. METHODS:A questionnaire was delivered to 246 hospitals at which physicians were treating childhood epilepsy to gain information about the total number of patients with Dravet syndrome and...

    journal_title:Epilepsia

    pub_type: 杂志文章,多中心研究

    doi:10.1111/j.1528-1167.2011.03053.x

    authors: Sakauchi M,Oguni H,Kato I,Osawa M,Hirose S,Kaneko S,Takahashi Y,Takayama R,Fujiwara T

    更新日期:2011-06-01 00:00:00

  • Epileptic spikes: magnetoencephalography versus simultaneous electrocorticography.

    abstract:PURPOSE:To test the sensitivity of extracranial magnetoencephalography (MEG) for epileptic spikes in different cerebral sites. METHODS:We simultaneously recorded MEG and electrocorticography (ECoG) by using subdural electrodes with 1-cm interelectrode distances for one patient with lateral frontal epilepsy and one pat...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1046/j.1528-1157.2002.10702.x

    authors: Oishi M,Otsubo H,Kameyama S,Morota N,Masuda H,Kitayama M,Tanaka R

    更新日期:2002-11-01 00:00:00

  • Vagus nerve stimulation elevates seizure threshold in the kindling model.

    abstract:PURPOSE:  Vagus nerve stimulation (VNS) provides partial relief of medically refractory partial seizures in a subset of patients. The optimal pattern of stimulation and the mechanism of the antiseizure effects are uncertain. Establishing the efficacy of VNS in an animal model of epilepsy would provide an experimental p...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1167.2012.03646.x

    authors: Alexander GM,McNamara JO

    更新日期:2012-11-01 00:00:00

  • Long-term social outcomes for children with epilepsy.

    abstract::Children with epilepsy often grow into adults with significant social problems including decreased employment, marriage, social relationships, and independent living arrangements. These problems are noted in population-based longitudinal and cross-sectional studies from many countries. Learning disorder and mental han...

    journal_title:Epilepsia

    pub_type: 杂志文章,评审

    doi:10.1111/j.1528-1167.2007.01390.x

    authors: Camfield CS,Camfield PR

    更新日期:2007-01-01 00:00:00

  • Anticonvulsant effect of flutamide on seizures induced by pentylenetetrazole: involvement of benzodiazepine receptors.

    abstract:PURPOSE:There is some structural similarity between the androgen receptor antagonist, flutamide (Flut) and benzodiazepines (BZDs). We evaluated the possible anticonvulsant effect and interaction of Flut with BZD receptors in common seizure models. METHODS:(a) Different groups of mice each were pretreated i.p. with Flu...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1046/j.1528-1157.2003.36402.x

    authors: Ahmadiani A,Mandgary A,Sayyah M

    更新日期:2003-05-01 00:00:00

  • Combined study of the pattern of spontaneous activity of cerebellar Purkinje cells and phenytoin serum levels in the rat.

    abstract::The effects of phenytoin (PHT) on the spontaneous activity of cerebellar Purkinje cells and the drug serum levels have been examined following both intravenous and intraperitoneal administration in rats. Purkinje cell activity was assessed by on-line computer analysis of interspike interval distributions. PHT levels w...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.1980.tb04313.x

    authors: Latham A,Paul DH

    更新日期:1980-12-01 00:00:00

  • Vigabatrin: clinical evidence supporting rational polytherapy in management of uncontrolled seizures.

    abstract::Monotherapy is the policy for management of patients with epilepsy. With increasing knowledge of the biology of epilepsy and of the modes of action of antiepileptic drugs (AEDs), this concept must be reevaluated. When monotherapy fails to control seizures, subsequent treatment should be based on "rational pharmacology...

    journal_title:Epilepsia

    pub_type: 临床试验,杂志文章

    doi:10.1111/j.1528-1157.1994.tb02447.x

    authors: de Bittencourt PR,Mazer S,Marcourakis T,Bigarella MM,Ferreira ZS,Mumford JP

    更新日期:1994-03-01 00:00:00

  • Risk of epilepsy in long-term survivors of surgery for aneurysmal subarachnoid hemorrhage: a population-based study in Iceland.

    abstract:PURPOSE:Epilepsy is known to result from aneurysmal subarachnoid hemorrhage (SAH). There are no population-based estimates of the absolute risk or the duration for which this risk is elevated. We have conducted a population-based study in Iceland of the risk of epilepsy after a ruptured cerebral aneurysm to address the...

    journal_title:Epilepsia

    pub_type: 杂志文章

    doi:10.1111/j.1528-1157.2000.tb00326.x

    authors: Olafsson E,Gudmundsson G,Hauser WA

    更新日期:2000-09-01 00:00:00