5 methoxy n n dimethyltryptamine/hyperalgesia

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Nociception is enhanced after low doses and reduced after high doses of the serotonin receptor agonist 5-methoxy-N,N-dimethyltryptamine.

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The effects on pain sensitivity of intracerebroventricular injections of 5-methoxy-N,N-dimethyltryptamine were tested by the tail-flick method. Following administration of 1.6, 3.1, 6.3, 12.5 and 25 micrograms (n = 8 for each dose), tail-flick latencies were reduced by 13-24%. Fifty and 100

Serotonin receptor antagonists induce hyperalgesia without preventing morphine antinociception.

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5-Hydroxytryptamine (5-HT) receptor blockade by administration of mianserin (1 mg/kg) or metergoline (0.25 mg/kg) shortened the response latencies of rats in the hot-plate (hind-paw lick response) and tail-flick tests, but did not consistently attenuate the antinociceptive effect of morphine

Effects of various serotoninergic agonists and an antagonist on a nociceptive reaction in mice.

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Low doses of 5-methoxy-N,N-dimethyltryptamine (5-MeODMT), quipazine and cyproheptadine produced facilitation of jumping in mice using the hot plate method. Higher doses produced severe motor disturbances which precluded the assessment of effects on nociception. The observed hyperalgesia might be a

Mechanisms by which the putative serotonin receptor antagonist metitepin alters nociception in mice.

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The putative serotonin (5-HT) receptor antagonist metitepin (0.5 mg/kg, intraperitoneally) produced hypoalgesia in the increasing temperature hot-plate test and hyperalgesia in the tail-flick test in mice. The effects of metitepin were not altered after depletion of 5-HT by the neurotoxin

Effects of serotonin receptor antagonists and agonists on the tail-flick response in mice involve altered tail-skin temperature.

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Tail-flick latency and tail-skin temperature were measured in mice after administration of serotonin (5-HT) receptor antagonists (metergoline and metitepin) and agonists [5-methoxy-N,N-dimethyltryptamine (5-MeODMT) and 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT)]. Metergoline (4 mg/kg) and

5-HT depletion with 5,7-DHT, PCA and PCPA in mice: differential effects on the sensitivity to 5-MeODMT, 8-OH-DPAT and 5-HTP as measured by two nociceptive tests.

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Depletion of 5-hydroxytryptamine (5-HT) in mice was produced by intracerebroventricular injection of 5,7-dihydroxytryptamine (5,7-DHT, 80 micrograms) or by systemic injections of p-chloroamphetamine (PCA, 3 X 40 or 4 X 40 mg/kg), p-chlorophenylalanine (PCPA, 5 X 400 or 14 X 400 mg/kg) or combined

Analgesia induced by 5-hydroxytryptamine receptor agonists is blocked or reversed by noradrenaline-depletion in rats.

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The antinociceptive effect of acute administration of 5-HT receptor agonists and agents releasing 5-HT from neuronal terminals was studied in rats by using the hot-plate, tail-flick and shock-titration tests. Noradrenaline depletion by the noradrenaline-neurotoxin

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