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

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Tan-No, K. et al.

Tan-No, Takahashi, Shimoda, Sugawara, Nakagawasai, Niijima, Sato, Satoh, Tadano,

S-(+)-fenfluramine-induced nociceptive behavior in mice: Involvement of interactions between spinal serotonin and substance P systems.

Intrathecal (i.t.) administration into mice of S-(+)-fenfluramine (0.01-0.1nmol), a serotonin (5-hydroxytryptamine, 5-HT) releaser, produced a behavioral response consisting of scratching, biting and licking. Here, we report the behavioral characteristics and the involvement of interactions between 5-HT and substance P ( SP) systems in the S-(+)-fenfluramine-induced behavioral response. The S-(+)-fenfluramine-induced behavioral response peaked at 5-15min and almost disappeared at 20min after injection. The behavior induced by S-(+)-fenfluramine (0.1nmol) was dose-dependently inhibited by an intraperitoneal injection of morphine (0.02-0.5mg/kg), suggesting that the behavioral response is related to nociception. The S-(+)-fenfluramine-induced nociceptive behavior was significantly inhibited by pretreatment with 5-HT antiserum and co-administration of ketanserin, a selective 5-HT2 receptor antagonist. However, WAY-100635, a selective 5-HT1A receptor antagonist, and ramosetron, a selective 5-HT3 receptor antagonist, were not active. On the other hand, SP antiserum and RP67580, a selective neurokinin-1 (NK1) receptor antagonist, significantly inhibited S-(+)-fenfluramine-induced nociceptive behavior. These results suggest that i.t.-administered S-(+)-fenfluramine releases SP through the activation of 5-HT2 receptors subsequent to 5-HT release, and, as a result, produces nociceptive behavior.[1]

References

S-(+)-fenfluramine-induced nociceptive behavior in mice: Involvement of interactions between spinal serotonin and substance P systems. Tan-No, K., Takahashi, K., Shimoda, M., Sugawara, M., Nakagawasai, O., Niijima, F., Sato, T., Satoh, S., Tadano, T. Neuropeptides (2007) [Pubmed]

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