Spinal analgesic activity of orphanin FQ/nociceptin and its fragments.

Abstract

Previous work reveals that orphanin FQ/nociceptin (OFQ/N) administered supraspinally produces an initial hyperalgesic response followed by analgesia. Spinally, OFQ/N elicits a rapidly appearing, naltrexone-reversible, dose-dependent analgesia in the tailflick assay without any indication of hyperalgesia. Two OFQ/N fragments, OFQ/N (1-7) and OFQ/N (1-11… (More)

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