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m-trifluoromethylphenylpiperazine and m-chlorophenylpiperazine-induced hypothermia in mice is reversed by tricyclic antidepressants and other drugs.

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Many antidepressants reverse arylpiperazine-induced hypothermia after acute treatment by a mechanism that does not seem to implicate monoamine uptake inhibition. Activity is found in reversing 1-(m-trifluoromethylphenyl)piperazine (TFMPP)-induced hypothermia by desipiramine 5 and 10 mg/kg and not by

Potentiation of 5-methoxy-N,N-dimethyltryptamine-induced hyperthermia by harmaline and the involvement of activation of 5-HT1A and 5-HT2A receptors.

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5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) and harmaline are serotonin (5-HT) analogs often abused together, which alters thermoregulation that may indicate the severity of serotonin toxicity. Our recent studies have revealed that co-administration of monoamine oxidase inhibitor harmaline leads to

Functional interaction between 5-HT1B and 5-HT1A or 5-HT2 receptors in mice.

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To investigate a possible functional interaction between 5-HT1B and 5-HT1A or 5-HT2 receptors we studied the effects of 5-HT1A selective agonists 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) and gepirone, of a 5-HT1A/5-HT2 agonist 5-methoxy-N,N-dimethyltryptamine (5-MeODMT) and of a putative

Selective cross-tolerance to 5-HT1A and 5-HT2 receptor-mediated temperature and corticosterone responses.

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The repeated administration of 5-methoxy-N,N-dimethyltryptamine (5-MeODMT, 3 mg/kg, twice daily for 14 days) significantly diminished hypothermia and corticosterone secretion induced by an acute challenge with the 5-HT1A agonist 8-OH-DPAT (0.1 mg/kg) when compared to the responses in animals treated

Brain iron and dopamine receptor function.

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It has been demonstrated that nutritional iron-deficiency induced in rats results in the reduction of DA D2 receptor binding sites, leading to down-regulation of dopaminergic activity similar to that observed in neuroleptic-treated animals. The following observations are common to both conditions:

The effects of acute and repeated administration of T3 to mice on 5-HT1 and 5-HT2 function in the brain and its influence on the actions of repeated electroconvulsive shock.

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The effects of the administration of L-triiodothyronine (T3) On the function of 5-HT in the CNS and its influence on the actions of electroconvulsive shock have been examined in mice. A single injection of T3 (100 micrograms/kg) had no effect 24 hr later on either 5-HT1A-mediated hypothermia,

Effects of carbamazepine on 5-hydroxytryptamine function in rodents.

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The effects of carbamazepine (CBZ) on brain 5-hydroxytryptamine (5-HT) function were investigated in rodents pretreated with CBZ acutely or for 14 days. In behavioural experiments, mice pretreated with 14 days CBZ showed increased 5-HT2-mediated head twitch behaviour after injection of carbidopa (25

Development of a mechanism-based pharmacokinetic/pharmacodynamic model to characterize the thermoregulatory effects of serotonergic drugs in mice.

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We have shown recently that concurrent harmaline, a monoamine oxidase-A inhibitor (MAOI), potentiates serotonin (5-HT) receptor agonist 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT)-induced hyperthermia. The objective of this study was to develop an integrated pharmacokinetic/pharmacodynamic (PK/PD)

5-Hydroxytryptamine-mediated behaviour in male and female rats.

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The responses of male and female rats to drugs causing the behavioural syndrome induced by 5-hydroxytryptamine (5-HT) were compared. Preliminary experiments showed that females had largely similar responses to the releaser of 5-HT, p-chloroamphetamine (PCA) and the 5-HT receptor agonist

Blockade of dopamine receptors explains the lack of 5-HT stereotypy on treatment with the putative 5-HT1A agonist LY165163.

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The putative serotonin (5-HT)1A agonist 1-[2-(4-aminophenyl)ethyl]-4-(3-trifluormethylphenyl) piperazine (LY165163, PAPP) induces hyperphagia and hypothermia in rats, but unlike other 5-HT agonists, does not induce 5-HT stereotypy even at high doses (10 mg/kg sc). LY165163 (1 mg/kg) increased

4-(2'-Methoxyphenyl)-1-[2'-[N-(2"-pyridinyl)-p-iodobenzamido]ethyl] piperazine and 4-(2'-methoxyphenyl)-1-[2'-[N-(2"-pyridinyl)-p- fluorobenzamido]ethyl]piperazine, two new antagonists at pre- and postsynaptic serotonin-1A receptors.

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p-MPPI [4-(2'-methoxyphenyl)-1-[2'-[N-(2"-pyridinyl)-p-iodobenzamido] ethylpiperazine] and p-MPPF [4-(2'-methoxyphenyl)-1-[2'-[N-(2"-pyridinyl)-p- fluorobenzamido]ethyl]piperazine] competitively antagonized 5-HT1A receptor activation in the rat, as measured by hypothermia, forepaw treading and 5-HT

Differential induction of 5-HT1A-mediated responses in vivo by three chemically dissimilar 5-HT1A agonists.

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In the rat, activation of 5-hydroxytryptamine1A (5-HT1A) receptors causes hypothermia and the 5-HT syndrome. The effects of three chemically dissimilar 5-HT1A agonists administered s.c. [8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT), gepirone, and

Thermoregulatory responses to serotonin (5-HT) receptor stimulation in the rat. Evidence for opposing roles of 5-HT2 and 5-HT1A receptors.

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The effects of serotonergic agonists and antagonists on the body temperatures of rats were investigated. The administration of the serotonin (5-HT) agonist 6-chloro-2(1-piperazinyl)-pyrazine (MK-212) produced a dose-related increase in body temperature. A maximal increase in body temperature of

The effects of a 5-HT1 receptor ligand isapirone (TVX Q 7821) on 5-HT synthesis and the behavioural effects of 5-HT agonists in mice and rats.

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The effects of 2-(4-(4-(2-pyrimidinyl)-1-piperazinyl)-butyl)-1,2-benzoisothiazol- 3(2H)one-1, 1-dioxide hydrochloride (isapirone, TVX Q 7821), a putative 5-HT1 receptor antagonist, has been studied on various models of 5-HT receptor sub-type function. In mice TVX Q 7821 produced a dose-dependent

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