5-hydroxytryptamine2A receptors regulate sympathetic nerves constricting the cutaneous vascular bed in rabbits and rats

@article{Blessing20035hydroxytryptamine2ARR,
  title={5-hydroxytryptamine2A receptors regulate sympathetic nerves constricting the cutaneous vascular bed in rabbits and rats},
  author={William W Blessing and Barbara Seaman},
  journal={Neuroscience},
  year={2003},
  volume={117},
  pages={939-948}
}

5‐Hydroxytryptamine 1A Receptors Inhibit Cold‐Induced Sympathetically Mediated Cutaneous Vasoconstriction in Rabbits

The experiments constitute the first demonstration that activation of 5‐HT1A receptors powerfully inhibits cold‐induced increases in cutaneous sympathetic vasomotor discharge, thereby dilating the cutaneous vascular bed and increasing transfer of heat to the environment.

Clozapine Reverses Hyperthermia and Sympathetically Mediated Cutaneous Vasoconstriction Induced by 3,4-Methylenedioxymethamphetamine (Ecstasy) in Rabbits and Rats

Clozapine and olanzapine, by interactions with 5-HT receptors or by other mechanisms, could reverse potentially fatal hyperthermia and cutaneous vasoconstriction occurring in some humans after ingestion of MDMA.

The serotonin 2A receptor agonist 25CN-NBOH increases murine heart rate and neck-arterial blood flow in a temperature-dependent manner

The findings imply that selective serotonin 2A receptor activation modulates systemic cardiovascular functioning in orchestration with thermoregulation and with immediate relevance to brain-imminent neck arteries as carotid branching is a critical last hub to channel cardiovascular output to or away from the brain.

Behavioral / Systems / Cognitive Clozapine Reverses Hyperthermia and Sympathetically Mediated Cutaneous Vasoconstriction Induced by 3 , 4-Methylenedioxymethamphetamine ( Ecstasy ) in Rabbits and Rats

Clozapine and olanzapine, by interactions with 5-HT receptors or by other mechanisms, could reverse potentially fatal hyperthermia and cutaneous vasoconstriction occurring in some humans after ingestion of MDMA.

Blockade of 5-HT2A receptors inhibits emotional hyperthermia in mice

It is suggested that 5-HT2A receptors play a significant role in mediating hyperthermia, but not tachycardia, during intruder-elicited psychological stress.

Clozapine and olanzapine, but not haloperidol, reverse cold-induced and lipopolysaccharide-induced cutaneous vasoconstriction

Both clozapine and olanzapine but not haloperidol, reverse physiologically induced cutaneous sympathetic vasomotor discharge, suggesting that similar neuropharmacological mechanisms might underly the cutaneous vasodilating action and the psychotropic actions of atypical antipsychotic drugs.

5-HT2A Receptor Agonist-Induced Hyperthermia Is Induced via Vasoconstriction by Peripheral 5-HT2A Receptors and Brown Adipose Tissue Thermogenesis by Peripheral Serotonin Loss at a High Ambient Temperature

Findings indicate that 25B-NBOMe induces hyperthermia at a high ambient temperature via vasoconstriction regulated by 5-HT2A receptors and BAT thermogenesis mediated by decreased levels of plasma serotonin, and peripheral serotonin plays a partial but important role in thermoregulation.

Selective blockade of 5-HT2A receptors attenuates the increased temperature response in brown adipose tissue to restraint stress in rats

Results indicate that psychological stress causes activation of 5-HT2A receptors in neural pathways that control thermogenesis in the brown adipose tissue and facilitate cutaneous vasoconstriction.
...

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Cutaneous Vasoconstriction Contributes to Hyperthermia Induced by 3,4-Methylenedioxymethamphetamine (Ecstasy) in Conscious Rabbits

Reversal of cutaneous vasoconstriction by appropriate pharmacological means could be of therapeutic benefit in humans suffering from life-threatening hyperthermia induced by MDMA.

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The results indicate that rabbit common carotid and femoral arteries contain both D‐type 5‐HT receptors and α‐adrenoceptors, as does the aorta; however, external carotids arteries, like ear arteries, do not contain specific 5‐ HT receptors.

Pharmacodynamic effects of serotonin (5-HT) receptor ligands in pigs: stimulation of 5-HT2 receptors induces malignant hyperthermia

Comparison of metabolic changes in susceptible and non-susceptible pigs suggested that the marked increase in plasma potassium, which arises principally from damaged muscle cells, is primarily responsible for the fatal effect of DOI and 5-MeO-DMT in genetically susceptible individuals.

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Central and peripheral injections of the 5-HT2 agonist, 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane, modify cardiovascular function through different mechanisms.

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    The Journal of pharmacology and experimental therapeutics
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The mechanisms underlying the cardiovascular effects of central and peripheral administration of the 5-HT2 (serotonin) receptor agonist (+-)-1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane hydrochloride (DOI) were studied in conscious rats and the pressor response to i.c.v. administration of DOI was mediated at sites outside the blood-brain barrier and was not secondary to vasopressin release.

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The present results show in conscious rabbits exposed to thermoneutral environment that these pyrogens activate sympathetic efferents in regionally differentiated time courses and suggest that arachidonate metabolites are involved not only in the thermoregulatory vasoconstrictor response in the ear and the body temperature increase but also in simultaneously evoked renal sympathetic and haemodynamic adjustments in fever.
...