Loss of antinociception induced by naloxone benzoylhydrazone in nociceptin receptor-knockout mice

Yukihiro Noda, Takayoshi Mamiya, Toshitaka Nabeshima, Miyuki Nishi, Masaya Higashioka, Hiroshi Takeshima

研究成果: Article査読

81 被引用数 (Scopus)


Nociceptin and nociceptin receptor, which show structural similarities to opioid peptides and opioid receptors, respectively, have been recently found to constitute a novel neuromodulatory system. In the brain, however, the physiological role of the modulation via the nociceptin receptor is still unclear. Administered nociceptin produces hyperalgesia and hypolocomotion, whereas the nociceptin receptor-knockout mice show no significant abnormalities in nociceptive thresholds and locomotion. To clarify possible involvement of the nociceptin receptor in the regulation of nociception and locomotion, we made use of the knockout mice and naloxone benzoylhydrazone (NalBzoH) identified originally as a ligand for opioid receptors. Experiments on the cultured cells transfected with the nociceptin receptor cDNA showed that NalBzoH competed with [3H]nociceptin binding and attenuated the nociceptin-induced inhibition of cAMP accumulation. Furthermore, behavioral studies demonstrated that NalBzoH completely inhibited nociceptin-induced hyperalgesia and hypolocomotion. It is therefore likely that NalBzoH can act as a potent antagonist for the nociceptin receptor in vivo. In wild-type mice, NalBzoH induced antinociception but did not affect locomotor activity. In contrast, in the knockout mice, no significant changes in nociception and locomotion were induced by NalBzoH. These results clearly suggest that the nociceptin system takes part in the physiological regulation of nociceptive thresholds but not in the basal modulation of locomotion.

ジャーナルJournal of Biological Chemistry
出版ステータスPublished - 17-07-1998

All Science Journal Classification (ASJC) codes

  • 生化学
  • 分子生物学
  • 細胞生物学


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