title: II - Prostaglandin hyperalgesia: the peripheral analgesic activity of morphine, enkephalins and opioid antagonists.
abstract: Morphine, enkephalins, nalorphine, naloxone and pentazocine are shown to have a peripheral analgesic effect. In our modification of the Randall-Selitto test these substances were 50--100 times more potent than a standard local anaesthetic, lidocaine. At this peripheral site, naloxone did not antagonize the effect of morphine. Morphine had a marked analgesic effect on the hyperalgesia induced by PGE2 and PGI2, BaCl2, Ca2+ ionophore A23187, isoprenaline but not on that induced by dibutyryl cyclic AMP. It was suggested that the peripheral analgesic effect of morphine is due to an inhibition of adenylate-cyclase activity.
mesh_terms: D000700:Analgesics; D000818:Animals; D001464:Barium / Q000494:pharmacology; D003994:Bucladesine / Q000494:pharmacology; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D006930:Hyperalgesia / Q000139:chemically induced*; D006941:Hyperesthesia / Q000139:chemically induced*; D007476:Ionophores / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D008012:Lidocaine / Q000494:pharmacology; D009020:Morphine / Q000494:pharmacology*; D009269:Nalorphine / Q000494:pharmacology; D009270:Naloxone / Q000494:pharmacology; D009292:Narcotic Antagonists / Q000494:pharmacology*; D009619:Nociceptors / Q000187:drug effects*; D010423:Pentazocine / Q000494:pharmacology; D011458:Prostaglandins E / Q000494:pharmacology*; D051381:Rats
chemical_list: D000700:Analgesics; D004723:Endorphins; D004745:Enkephalins; D007476:Ionophores; D009292:Narcotic Antagonists; D011458:Prostaglandins E; D001464:Barium; D009270:Naloxone; D003994:Bucladesine; D009020:Morphine; D008012:Lidocaine; D007545:Isoproterenol; D010423:Pentazocine; D009269:Nalorphine