l histidine/эпилептический припадок

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Postnatal expression of H1-receptor mRNA in the rat brain: correlation to L-histidine decarboxylase expression and local upregulation in limbic seizures.

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Histamine is implicated in the regulation of brain functions through three distinct receptors. Endogenous histamine in the brain is derived from mast cells and neurons, but the importance of these two pools during early postnatal development is still unknown. The expression of histamine H1-receptor

Two essential amino acids, L-lysine and L-histidine, in five types of experimental seizures.

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L-Lysine (250-2,000 mg/kg) and L-histidine (1,000-2,000 mg/kg) significantly raised the electroconvulsive threshold. D-Histidine (1,000 mg/kg) was completely ineffective in this regard. Both amino acids were generally inactive in pentetrazole-, picrotoxin- and aminophylline-induced seizures, though

L-histidine is a beneficial adjuvant for antiepileptic drugs against maximal electroshock-induced seizures in mice.

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Endogenous histamine has been reported to be involved in regulation of seizure susceptibility. Enhancement of histamine neurotransmission engendered by L-histidine treatment produces anticonvulsant effects in experimental animals. The present study investigated the influence of L-histidine on the

Biphasic action of the histamine precursor L-histidine in the rat kindling model of epilepsy.

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The effects of the histamine precursor, L-histidine, were examined in the rat kindling model of epilepsy. The intraperitoneal (i.p.) administration of 800 mg/kg L-histidine significantly prolonged the latency to the onset of bilateral forelimb clonus of previously kindled seizures from the amygdala

Histamine levels and clonic convulsions of electrically-induced seizure in mice: the effects of alpha-fluoromethylhistidine and metoprine.

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The purpose of this study was to investigate the possible role of the central histaminergic neuron system in electrically-induced seizure in mice. For this purpose, we examined the effects of intraperitoneal (i.p.) injections of histaminergic agents, such as L-histidine, metoprine, and

Studies on the effects of histaminergic agents on seizure susceptibility in mice.

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The influence of pharmacological modifications of the functional activity of the central histaminergic system was studied on the susceptibility of mice to pentylenetetrazol-induced minimal (clonic) and maximal (tonic) seizures. Enhancement in the functional activity of the system by central

[Studies on histamine with L-histidine decarboxylase, a histamine-forming enzyme, as a probe: from purification to gene knockout].

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I have been studying the functions of the histaminergic neuron system in the brain, the location and distribution of which we elucidated with antibody raised against L-histidine decarboxylase (a histamine-forming enzyme) as a marker in 1984. For this purpose, we used two methods employing (1)

Histaminergic mechanisms in experimental convulsions.

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Effect of some histamine (HA) agonists and antagonists were assessed on electroshock (MES) convulsions in mice and rats. In mice, pretreatment with the HA precursor, l-histidine (100, 500 and 1000 mg/kg) precipitated seizures after a subthreshold (30 mA) stimulus. Both incidence (%) and tonic hind

Lack of substantial effect of the H(3)-antagonist thioperamide and of the non-selective mixed H(3)-antagonist/H(1)-agonist betahistine on amygdaloid kindled seizures.

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We investigated whether some histamine H(3)-antagonists would attenuate amygdaloid kindled seizures in rats. Thioperamide, a standard H(3)-antagonist, did not significantly reduce either seizure ranks or afterdischarge duration (ADD). Betahistine which has both H(3)-antagonistic activity and

Amino acid uptake in vivo by the mouse brain and by various regions of the rabbit brain after drug-induced convulsions.

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The levels of the free amino acids of the mouse brain were studied after convulsions induced by Metrazol; a decrease of level of taurine and a significant increase of level of alanine, phenylalanine and isoleucine were found. The net uptake of L-histidine by the mouse brain in vivo was similar under

Carnosine, a precursor of histidine, ameliorates pentylenetetrazole-induced kindled seizures in rat.

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Carnosine (beta-alanyl-l-histidine) has been characterized as a putative neurotransmitter. However, so far, understanding of the role of carnosine in the brain is very limited. The objective of this study was to examine the effects of carnosine on the development of pentylenetetrazol (PTZ) kindling

Effects of carnosine on amygdaloid-kindled seizures in Sprague-Dawley rats.

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The effects of carnosine (beta-alanyl-L-histidine) on amygdaloid-kindled seizures were investigated in rats. I.p. injection of carnosine (500, 1000, 1500 mg/kg, i.p.) significantly decreased seizure stage, afterdischarge duration and generalized seizure duration, and significantly prolonged

Role of central histaminergic system in lorazepam withdrawal syndrome in rats.

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Effects of histaminergic agonists and antagonists were investigated on withdrawal signs in lorazepam-dependent rats. Physical dependence was developed by giving lorazepam admixed with the food in the following dose schedule (in mg/kg given daily x days): 10 x 4, 20 x 4, 40 x 4, 80 x 4, and 120 x 7.

Studies on functional roles of the histaminergic neuron system by using pharmacological agents, knockout mice and positron emission tomography.

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Since one of us, Takehiko Watanabe (TW), elucidated the location and distribution of the histaminergic neuron system in the brain with antibody raised against L-histidine decarboxylase (a histamine-forming enzyme, HDC) as a marker in 1984 and came to Tohoku University School of Medicine in Sendai,

The histaminergic system in the brain: structural characteristics and changes in hibernation.

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Histaminergic neurons in adult vertebrate brain are confined to the posterior hypothalamic area, where they are comprised of scattered groups of neurons referred to as the tuberomammillary nucleus. Histamine regulates hormonal functions, sleep, food intake, thermoregulation and locomotor activity,

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