Nociceptin/orphanin FQ binding increases in superficial laminae of the rat spinal cord during persistent peripheral inflammation

Yu Ping Jia, David R. Linden, Janet R. Serie, Virginia S. Seybold

Research output: Contribution to journalArticle

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Regulation of nociceptin/orphanin FQ neurotransmission in conjunction with peripheral inflammation and hyperalgesia was explored, using receptor autoradiography. Binding of [3H]nociceptin was quantified in spinal segment L4 of rats at 2, 4 and 8 days following injection of complete Freund's adjuvant (CFA) into one hind-paw. Densitometric analysis of autoradiograms showed that [3H]nociceptin binding increased in medial and lateral laminae I-II bilaterally 4 days following injection of CFA compared to untreated rats; no change in binding occurred in lamina X at the times examined. Biochemical studies confirmed that the specific binding of [3H]nociceptin to sections of rat brain was consistent with the binding characteristics of the nociceptin receptor. These results suggest that spinal nociceptin receptors are upregulated during hyperalgesia. This response may enhance endogenous mechanisms of antinociception to attenuate the hyperalgesia induced by CFA.

Original languageEnglish (US)
Pages (from-to)21-24
Number of pages4
JournalNeuroscience Letters
Issue number1
StatePublished - Jun 26 1998



  • Nociceptin
  • Orphanin FQ
  • Peripheral inflammation
  • Receptor
  • Spinal dorsal horn

ASJC Scopus subject areas

  • Neuroscience(all)

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