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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Involvement of 5-HT2C receptors in the m-CPP-induced antinociception in mice.

Effects of the non-selective 5-hydroxytryptamine (5-HT) receptor agonist m-chlorophenylpiperazine (m-CPP) on the nociceptive responsiveness in a hot plate and tail flick tests were examined in mice. Intraperitoneal administration of m-CPP (1-10 mg/kg) produced a dose-dependent antinociception in both those tests; the effect of m-CPP in the hot plate test was stronger. The antinociceptive effect of m-CPP in either test was abolished by pretreatment with mesulergine (2 mg/kg), ritanserin (1-2 mg/kg), 5-HT2A/5-HT2C receptor antagonists, and metergoline (0.5-2 mg/kg), a non-selective 5-HT receptor antagonist. On the other hand, spiperone (0.25-0.5 mg/kg), a dopamine, 5-HT1A and 5-HT2A receptor antagonist; pindolol (4-8 mg/kg), a beta-adrenoceptor, 5-HT1A and 5-HT1B receptor antagonist and zacopride (0.1-1 mg/kg) a 5-HT3 receptor antagonist, did not affect the analgesia induced by m-CPP. Neither of the drugs used as putative receptor antagonists changed the nociceptive responsiveness in mice. The obtained results suggest that the analgesia induced by m-CPP is mediated by 5-HT2C receptors.[1]


  1. Involvement of 5-HT2C receptors in the m-CPP-induced antinociception in mice. Chojnacka-Wójcik, E., Kłodzińska, A., Dereń-Wesołek, A. Polish journal of pharmacology. (1994) [Pubmed]
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