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glutamine/crise épileptique
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Inhibition of glutamine synthetase in the central nucleus of the amygdala induces anhedonic behavior and recurrent seizures in a rat model of mesial temporal lobe epilepsy.
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The prevalence of depression and suicide is increased in patients with mesial temporal lobe epilepsy (MTLE); however, the underlying mechanism remains unknown. Anhedonia, a core symptom of depression that is predictive of suicide, is common in patients with MTLE. Glutamine synthetase, an astrocytic
Effects of valproate and other antiepileptic drugs on brain glutamate, glutamine, and GABA in patients with refractory complex partial seizures.
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Preclinical studies suggested valproate increased brain gamma-aminobutyric acid (GABA) with no major effects on brain glutamate or glutamine. Valproate increased human cerebrospinal fluid GABA and glutamine in some studies; others reported no effect. In vivo measurements of glutamate, glutamine, and
D-glutamine produces seizures and retrograde amnesia in the chick.
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D-glutamine, 6 mumols/chick, injected intracranially one min after training, produces retrograde amnesia when tested 24 and 48 hr post training on an avoidance task. D-glutamine also produces ectostriatal seizures that correlate with amnestic activity.
Alterations in glutamine synthetase activity by FeCl2-induced focal and kindled amygdaloid seizures.
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The purpose of this study was to determine the effects of two experimental models of chronic epilepsy in rats on the activity of the astroglial enzyme glutamine synthetase. FeCl2-induced cortical lesions that increased the sensitivity to pentylenetetrazol-induced generalized seizures also
Transcriptional Regulation of the Glutamate/GABA/Glutamine Cycle in Adult Glia Controls Motor Activity and Seizures in Drosophila.
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The fruitfly Drosophila melanogaster has been extensively used as a genetic model for the maintenance of nervous system's functions. Glial cells are of utmost importance in regulating the neuronal functions in the adult organism and in the progression of neurological pathologies. Through a
Seizures in the Mongolian gerbil are related to a deficiency in cerebral glutamine synthetase.
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1. Seizure prone (SP)-gerbils (Meriones unguiculatus) tested repeatedly in an open field exhibited habituation of seizures after one or two trials and subsequently showed more ambulatory activity than non-seizure prone (NSP) individuals. 2. A subset of 5 SP and 5 NSP animals were killed and portions
Differential inhibition of glutamine and gamma-glutamylcysteine synthetases by alpha-alkyl analogs of methionine sulfoximine that induce convulsions.
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The alpha-methyl and alpha-ethyl analogs of methionine sulfoximine, like methionine sulfoximine, induce convulsions in mice and inhibit glutamine synthetase irreversibly; alpha-ethylmethionine sulfoximine is approximately 50% as inhibitory as methionine sulfoximine and alpha-methylmethionine
Chronic h1-antihistamine treatment increases seizure susceptibility after withdrawal by impairing glutamine synthetase.
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OBJECTIVE
To investigate the effect of chronic H1-antihistamine treatment on seizure susceptibility after drug withdrawal in nonepileptic rats and to further study its relation to glutamine synthetase (GS), which is the key enzyme for glutamate metabolism and gamma aminobutyric acid (GABA)
Disrupted glutamate-glutamine cycle in acute encephalopathy with biphasic seizures and late reduced diffusion.
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BACKGROUND
Acute encephalopathy with biphasic seizures and late reduced diffusion (AESD) is the most common subtype of infectious pediatric encephalopathy in Japan. It is sometimes difficult to make an early diagnosis of AESD; excitotoxicity is postulated to be the pathogenesis based on elevated
Oral glutamine supplementation increases seizure severity in a rodent model of mesial temporal lobe epilepsy.
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Background: Glutamine synthetase (GS) is the only enzyme known to synthesize significant amounts of glutamine in mammals, and loss of GS in the hippocampus has been implicated in the pathophysiology of medication refractory mesial temporal lobe epilepsy (MTLE). Moreover, loss-of-function
Glutamine synthetase induced spinal seizures in rats.
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Glutamine synthetase (GS) is a key enzyme in the regulation of glutamate neurotransmission in the central nervous system. It is responsible for converting glutamate to glutamine, consuming one ATP and NH3 in the process. Glutamate is neurotoxic when it accumulates in extracellular fluids. We
Haploinsufficiency of glutamine synthetase increases susceptibility to experimental febrile seizures.
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Glutamine synthetase (GS) is a pivotal glial enzyme in the glutamate-glutamine cycle. GS is important in maintaining low extracellular glutamate concentrations and is downregulated in the hippocampus of temporal lobe epilepsy patients with mesial-temporal sclerosis, an epilepsy syndrome that is
Differential expression of the astrocytic enzymes 3-hydroxyanthranilic acid oxygenase, kynurenine aminotransferase and glutamine synthetase in seizure-prone and non-epileptic mice.
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Previous investigations in seizure-prone mice have suggested that an abnormally elevated production of the astrocyte-derived neuroexcitant, quinolinic acid (QUIN), plays a role in seizure susceptibility. In order to evaluate further the role of QUIN metabolism in genetic murine seizure models, the
Chronic electrographic seizure reduces glutamine and elevates glutamate in the extracellular fluid of rat brain.
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Effects of spontaneous seizures on extracellular glutamate and glutamine were studied in the kainate-induced rat model of epilepsy in the chronic phase. Extracellular fluid from the CA1-CA3 regions of the hippocampus was collected with a 2-mm microdialysis probe every 2 min for 5h. EEG seizures with
Glutamine synthetase becomes nitrated and its activity is reduced during repetitive seizure activity in the pentylentetrazole model of epilepsy.
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OBJECTIVE
The astrocyte-specific glutamine synthetase (GS) plays a key role in glutamate recycling and Gamma-aminobutyric acid (GABA) metabolism. Changes in the expression or activity of GS have been proposed to contribute to epileptogenesis. The mechanisms or how and where GS may contribute to
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