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Sida 1 från 33 resultat
Forskolin suppresses seizures induced by pentylenetetrazol in mice.
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Forskolin, an adenylate cyclase activator when injected s.c. (1 mg/kg) in mice, caused an elevation of cAMP in the forebrain and cerebellum of up to 170% and 130%, respectively. The treatment was found to prevent seizures induced by pentylenetetrazol. This suppression had subsided 30 min after the
(S)-4-carboxy-3-hydroxyphenylglycine, an antagonist of metabotropic glutamate receptor (mGluR) 1a and an agonist of mGluR2, protects against audiogenic seizures in DBA/2 mice.
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The in vivo anticonvulsant effects and in vitro metabotropic glutamate receptor selectivity of (S)-4-carboxy-3-hydroxy-phenylglycine [(S)-4C3HPG] were examined. Intracerebroventricular injection of (S)-4C3HPG dose-dependently antagonized audiogenic-induced clonic and tonic convulsions in DBA/2 mice
Hyperthermia-induced seizures produce long-term effects on the functionality of adenosine A1 receptor in rat cerebral cortex.
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Febrile seizures are one of the most frequent childhood neurological disorders; they are classified into simple and prolonged, depending on their duration. Prolonged FS lasts more than 15 min and may evoke neurological sequelae in a process in which molecular alterations seem to play an important
Pharmacological inhibition of forskolin-stimulated adenylate cyclase activity in rat brain by melatonin, its analogs, and diazepam.
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Preincubation of rat forebrain membranes for 30-60 min with micromolar concentrations of the pineal hormone, melatonin, significantly inhibited forskolin-stimulated adenylate cyclase (AC) activity. Melatonin had an EC25 (concentration which inhibited AC activity by 25%) of 600 microM and caused a
Effects of the diterpene sclareol glycol on convulsive seizures.
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The effects of the diterpene sclareol glycol (SG) of the labdane family on convulsive seizures induced by pentylenetetrazole (PTZ), picrotoxin and bicuculline in mice were studied. Sclareol glycol potentiated convulsive seizures induced by PTZ (60 and 80 mg/kg) and antagonized the anticonvulsant
Seizure activity induces PIM-1 expression in brain.
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We recently identified KID-1, a previously undescribed protein kinase induced by depolarization in PC12 cells and brain (Feldman et al., 1998). KID-1 shares a high degree of sequence homology with PIM-1, a proto-oncogene previously reported to be expressed in hematopoietic and germ cells. We
Differential regulation of the nerve growth factor and brain-derived neurotrophic factor genes in L929 mouse fibroblasts.
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Nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF) are structurally related survival and differentiation factors for distinct sets of peripheral and central neurons. The regulation of NGF gene expression has been extensively studied in L929 mouse fibroblasts. L929 cells also
Linalool from rosewood (Aniba rosaeodora Ducke) oil inhibits adenylate cyclase in the retina, contributing to understanding its biological activity.
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Rosewood oil (RO) (Aniba rosaeodora Ducke) is rich in linalool, a monoterpene alcohol, which has well studied anxiolytic, sedative and anticonvulsant effects. The inhibition of the increases in cAMP protects against seizures in a diversity of models of epilepsy. In this paper, the principal aim was
Synthesis of the four isomers of 4-aminopyrrolidine-2,4-dicarboxylate: identification of a potent, highly selective, and systemically-active agonist for metabotropic glutamate receptors negatively coupled to adenylate cyclase.
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The four isomers of 4-aminopyrrolidine-2,4-dicarboxylate (APDC) were prepared and evaluated for their effects at glutamate receptors in vitro. (2R,4R)-APDC (2a), an aza analog of the nonselective mGluR agonist (1S,3R)-1-aminocyclopentane-1,3-dicarboxylate (1S,3R)-ACPD, 1), was found to possess
Synaptotagmin IV is an immediate early gene induced by depolarization in PC12 cells and in brain.
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Subtractive library construction and differential screening were used to identify a cDNA for a cell type-specific immediate early gene induced in rat PC12 pheochromocytoma cells. Sequencing identified the protein product of this gene as rat synaptotagmin IV (SytIV). Synaptotagmins are synaptic
H(2)O(2) induces upregulation of Fas and Fas ligand expression in NGF-differentiated PC12 cells: modulation by cAMP.
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Fas, (APO-1/CD95), a transmembrane glycoprotein belonging to the tumor necrosis (TNF) receptor superfamily, transduces apoptotic death upon crosslinking by its cognate ligand (FasL). As upregulation of Fas/FasL expression occurs in neuropathological conditions (e.g., stroke, central nervous system
Mechanisms of hyperthermia-induced depression of GABAergic synaptic transmission in the immature rat hippocampus.
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Clinical observations and experimental studies have shown that hyperthermia can provoke febrile seizures, which are the most common type of pathological brain activity in children. We previously demonstrated that hyperthermia produced a depression of GABAergic neurotransmission in the hippocampus of
Recent advances in GABAB receptors: from pharmacology to molecular biology.
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Bicuculline-insensitive receptors for the inhibitory neurotransmitter gamma-aminobutyric acid (GABA), GABAB receptors, are a distinct subclass of receptors that mediate depression of synaptic transmission and contribute to neuronal inhibition. When activated, these receptors reduce transmission at
Electroconvulsive shock (ECS) and the adenosine neuromodulatory system: effect of single and repeated ECS on the adenosine A1 and A2 receptors, adenylate cyclase, and the adenosine uptake site.
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The effect of a single electroconvulsive shock (ECS) (30 min and 24 h after treatment) and repeated ECS (10 once-daily) on the adenosine neuromodulatory system was investigated in rat cerebral cortex, cerebellum, hippocampus, and striatum. The present study examined the adenosine A1 receptor using
Interactions of lithium and drugs that affect signal transduction on behaviour in rats.
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The therapeutic mechanism of the action of lithium in the treatment of bipolar affective disorder is not known, in spite of a burgeoning number of biochemical studies linking lithium to signal transduction processes. This article reviews a decade of studies examining the behavioural manifestations
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