Selective inhibition of nociceptive flexion reflex discharge by the kappa agonist bremazocine.
In unanaesthetized decerebrate spinal cats, bremazocine (0.012-0.2 mg/kg, i.v.) selectively inhibited the late C-fibre reflex discharge, recorded in sectioned lumbo-sacral ventral root filaments, after supramaximal electrical stimulation of the ipsilateral sural or common peroneal nerve. This action was naloxone-reversible. The results suggest that activation of kappa opioid receptors in the spinal cord inhibits the integration of nociceptive, but not locomotor, flexion reflexes.
D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D001575:Benzomorphans / Q000494:pharmacology*; D002415:Cats; D003655:Decerebrate State; D004558:Electric Stimulation; D009019:Morphinans / Q000494:pharmacology*; D011957:Receptors, Opioid / Q000187:drug effects*; D017473:Receptors, Opioid, kappa; D013127:Spinal Nerves / Q000187:drug effects*
D000700:Analgesics; D001575:Benzomorphans; D009019:Morphinans; D011957:Receptors, Opioid; D017473:Receptors, Opioid, kappa; C027248:bremazocine