5 hydroxytryptamine/lafyèv

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Elevated environmental temperatures can induce hyperthermia during d-fenfluramine exposure and enhance 5-hydroxytryptamine (5-HT) depletion in the brain.

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d-Fenfluramine (d-Fen) has been demonstrated to alter body temperature (BT), decrease 5-hydroxytryptamine (5-HT) and decrease 5-HT plasma membrane transporters (PMT) in rats. Therefore, experiments were designed to test whether a correlation existed between elevated BT and brain 5-HT depletions. It

5-hydroxytryptamine 1A receptor activation reduces cutaneous vasoconstriction and fever associated with the acute inflammatory response in rabbits.

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5-Hydroxytryptamine(1A) (5-HT1A) receptor activation reduces body temperature partially by dilating the thermoregulatory cutaneous vascular bed, thereby increasing heat transfer to the environment. Constriction of this vascular bed, with consequent reduction of heat transfer to the environment,

Antagonism of fenfluramine-induced hyperthermia in rats by some, but not all, selective inhibitors of 5-hydroxytryptamine uptake.

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The injection of fenfluramine (7.5 mg kg-1,i.p.) to rats housed at 27-28 degrees C was associated with an elevation of core body temperature which peaked at approximately 1 h post-injection. One h pretreatment with citalopram (20 mg kg-1, i.p.), chlorimipramine (10 mg kg-1, i.p.), femoxetine (10 mg

The effect of highly selective inhibitors of the uptake of noradrenaline or 5-hydroxytryptamine on TRH-induced hyperthermia in mice.

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Well established as supposed antidepressant drugs, desipramine (1.25-5 mg/kg), nisoxetine (0.625-2.5 mg/kg) and clomipramine (1.25-5 mg/kg) but not fluoxetine (2.5-40 mg/kg) or citalopram (2.5-40 mg/kg) dose-dependently potentiated TRH (40 mg/kg)-induced hyperthermia in mice. Alpha-adrenergic

Contrasting roles of 5-hydroxytryptamine and noradrenaline in fever in rats.

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1. We have investigated the effects of endogenous monoamine depletion on the development of fever in rats. 2. Fever was produced in rats by a single intraperitoneal injection of Salmonella typhosa endotoxin or leucocyte pyrogen manufactured from ox blood. 3. Depletion of brain 5-hydroxytryptamine

Influence of 5-hydroxytryptamine on the combination effect of lonidamine or gossypol and hyperthermia on Ehrlich tumour in vivo.

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An experiment was conducted using lonidamine and gossypol against Ehrlich tumour in the foot pad of CD-1 mice. These compounds alone were mild antitumour agents, but their cytotoxicity increased when they were combined with hyperthermia. The antitumor effect was further increased by

Amitriptyline and femoxetine, but not clomipramine or citalopram, antagonize hyperthermia induced by directly acting 5-hydroxytryptamine-like drugs in heat adapted rats.

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5-HT uptake inhibitors and pirenperone (a 5-HT2 receptor antagonist), which in previous experiments antagonized fenfluramine (5-HT releaser)-induced hyperthermia in heat adapted rats, were tested against hyperthermia induced by the directly acting 5-HT agonist--m-CPP and quipazine. Pirenperone and

[Simultaneous determination of the levels of 5-hydroxytryptamine and 5-hydroxyindolacetic acid in the cerebrospinal fluid, hypothalamus and cerebral trunk of the rabbit in the course of fever induced by a bacterial pyrogen].

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Hyperthermia and elevated brain 5-hydroxytryptamine of rabbits in response to tryptophan and 5-hydroxytryptophan infusion.

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Different action of 5-hydroxytryptamine (5-HT) uptake inhibitors on fenfluramine- but not p-chloramphetamine-induced hyperthermia in rats.

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The effect of 4-acetamidophenol in reducing fever produced by the intracerebral injection of 5-hydroxytryptamine and pyrogen in the conscious cat.

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[Hyperthermia and noradrenaline, dopamine and 5-hydroxytryptamine level in the brain of rats].

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Turnover rate of brain 5-hydroxytryptamine increased by D-amphetamine.

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1. Administration of two doses of amphetamine HCl (5 mg/kg intraperitoneally) 45 min apart raised body temperature of rats by an average of 3.4 degrees C and increased the turnover rate of brain 5-hydroxytryptamine (5-HT) by almost one-half.2. Both effects were blocked by exposure to 4 degrees C or

Different hypothalamic receptors mediate 5-hydroxytryptamine- and tryptamine-induced core temperature changes in the rat.

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1 Unilateral intrahypothalamic injection of 5-hydroxytryptamine (5-HT) caused a dose-related fall in core temperature in rats, whereas injection of tryptamine into the same site caused a dose-related rise in core temperature. 2 The core temperature changes induced by 5-HT or tryptamine were

Opposing temperature responses to intrahypothalamic injections of 5-hydroxytryptamine in the pigeon exposed to cold.

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5-Hydroxytryptamine injected into posterior and anterior parts of the pigeon hypothalamus evoked a short lasting hyperthermia or hypothermia, respectively. Variable responses obtained within the same brain region suggest the existence of different 5-HT systems, even in rather limited hypothalamic

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