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guanosine/crise epiléptica
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Effect of orally administered guanosine on seizures and death induced by glutamatergic agents.
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Intraperitoneal guanosine has been shown to prevent quinolinic acid-induced seizures in mice. In this study, we investigated the effect of orally administered guanosine on seizures induced by the glutamate agonists quinolinic acid and kainate, and the endogenous glutamate releaser alpha-dendrotoxin.
Guanosine and GMP prevent seizures induced by quinolinic acid in mice.
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In the mammalian CNS, glutamate and GABA are the principal neurotransmitters mediating excitatory and inhibitory synaptic events, respectively, and have been implicated in the neurobiology of seizures. Guanine-based purines, including the nucleoside guanosine and the nucleotide GMP, have been shown
Phenytoin antagonism of electrically induced maximal seizures in frogs and mice and effects on central nervous system levels of adenosine 3',5'-monophosphate and guanosine 3',5'-monophosphate.
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Phenytoin antagonized the electroshock-induced increase in levels of cyclic adenosine 3',5'-monophosphate (cAMP) and cyclic guanosine 3',5'-monophosphate (cGMP) in cerebrum and cerebellum, respectively, from CF-1 mice. However, the effective dose range of phenytoin for significant reduction of the
Quinolinic acid promotes seizures and decreases glutamate uptake in young rats: reversal by orally administered guanosine.
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Quinolinic acid (QA) has been used as a model for experimental overstimulation of the glutamatergic system. Glutamate uptake is the main mechanism involved in the maintenance of extracellular glutamate below toxic levels. Guanosine systemically administered prevents quinolinic acid-induced seizures
Electrophysiological effects of guanosine and MK-801 in a quinolinic acid-induced seizure model.
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Quinolinic acid (QA) is an N-methyl-D-aspartate receptor agonist that also promotes glutamate release and inhibits glutamate uptake by astrocytes. QA is used in experimental models of seizures studying the effects of overstimulation of the glutamatergic system. The guanine-based purines (GBPs),
Interactions between cholinergic drugs, gamma-aminobutyric acid and cyclic guanosine monophosphate on picrotoxin-induced convulsive-seizure threshold.
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Cyclic nucleotide metabolism in mouse brain during seizures induced by bicuculline or dibutyryl cyclic guanosine monophosphate.
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Effects of 7-nitroindazole, NG-nitro-L-arginine, and D-CPPene on harmaline-induced postural tremor, N-methyl-D-aspartate-induced seizures, and lisuride-induced rotations in rats with nigral 6-hydroxydopamine lesions.
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The present behavioral study was undertaken to investigate whether neuronal nitric oxide (NO) synthase mediates the abnormal consequences of increased NMDA receptor-mediated synaptic transmission in models of postural tremor, Parkinson's disease and epilepsy. We used 7-nitroindazole, a selective
Phenytoin inhibition of cyclic guanosine 3':5'-monophosphate (cGMP) accumulation in neuroblastoma cells by calcium channel blockade.
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Phenytoin (diphenylhydantoin) inhibits the calcium-dependent increases in guanosine 3':5'-monophosphate (cGMP) produced by high potassium depolarization and by muscarinic receptor activation in N1E-115 neuroblastoma cells. The inhibition of the cGMP response to depolarization is half-maximal at 40
Deuterated halothane--anesthetic potency, anticonvulsant activity, and effect on cerebellar cyclic guanosine 3',5'-monophosphate.
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The effect of substituting deuterium for hydrogen in the halothane molecule on anesthetic potency, motor activity, and cerebellar cyclic guanosine 3',5'-monophosphate (cGMP) content was studied in mice. The concentration of halothane required to abolish the righting reflex in 50% of the mice
Cerebrospinal fluid GABA reductions in seizure patients evoked by cerebellar surface stimulation.
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Lumbar cerebrospinal fluid (CSF) gamma-aminobutyric acid (GABA) levels determined by fluorometric assay in four seizure patients were found to be significantly lower during bilateral, continuous cerebellar stimulation than those determined after a 7-day period without stimulation. The CSF GABA
Guanosine triphosphate cyclohydrolase I deficiency: a rare cause of hyperphenylalaninemia.
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Tetrahydrobiopterin (BH4) deficiencies are a heterogeneous group of disorders caused by a defect in two of the three enzymes involved in its biosynthesis or in the two recycling enzymes. Except for the deficiency of dehydratase, an enzyme catalyzing a reaction in the recycling pathway, all other
Suppression of neuronal network excitability and seizure-like events by 2-methyl-4-oxo-3H-quinazoline-3-acetyl piperidine in juvenile rat hippocampus: involvement of a metabotropic glutamate receptor.
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We present data on the antiepileptic potency of 2-methyl-4-oxo-3H-quinazoline-3-acetyl piperidine (Q5) in juvenile (P9-13) rat hippocampal slices and in particular Q5's action mechanism and target. Q5 (200-500 microM), but not alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA)/Kainate
Anticonvulsive activity of several excitatory amino acid antagonists against barbital withdrawal-induced spontaneous convulsions.
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Several excitatory amino acid antagonists were tested for an ability to prevent spontaneous convulsions seen during the barbital abstinence syndrome in rats. Barbital-dependent animals were continuously infused intracerebroventricularly (i.c.v.) for the first 48 h following barbital withdrawal with
Comparison of peptidic and nonpeptidic delta-opioid agonists on guanosine 5'-O-(3-[35S]thio)triphosphate ([35S]GTPgammaS) binding in brain slices from Sprague-Dawley rats.
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Previous studies have demonstrated that peptidic and nonpeptidic delta-opioid receptor agonists have different effects depending on the measure. For example, nonpeptidic delta-opioid agonists, but not peptidic agonists, produce convulsions in rats, and in vitro studies suggested that peptidic and
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