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Scoto, Giovanna M.; Aricò, Giuseppina; Ronsisvalle, Simone; Parenti, Carmela
Pharmacology, biochemistry and behavior, January 2012, 2012, 2012-Jan, 2012-01-00, 20120101, Letnik: 100, Številka: 3Journal Article
Nocistatin (NST) and Nociceptin/Orphanin FQ (N/OFQ) are derived from the same precursor protein, pre-proN/OFQ, and exert opposite effects on the modulation of pain signals. However, the role of the peripheral N/OFQ and the NOP receptor, which is located at the endings of sensory nerves, in inflammatory pain was not ascertained. NST administered intrathecally (i.t.) prevented the nociceptive effects induced by i.t. N/OFQ and PGE2. Moreover an up regulation of N/OFQ was shown in the rat in response to peripheral inflammation. Here, we investigated the effects of intraplantar (i.pl.) administration of functional N/OFQ and NOP receptor antagonists in a rat model of inflammatory pain. Our findings showed that i.pl. injection of (±)-J 113397, a selective antagonist of the NOP receptor, and NST, the functional N/OFQ antagonist, prior to carrageenan significantly reduced the paw allodynic and thermal hyperalgesic threshold induced by the inflammatory agent. The resulting antiallodynic and antihyperalgesic effects by co-administering NST and (±)-J 113397 prior to carrageenan were markedly enhanced, and the basal latencies were restored. Thus, it is likely that the peripheral N/OFQ/NOP receptor system contributes to the abnormal pain sensitivity in an inflammatory state. Display omitted ► Intraplantar Nocistatin and (±)-J 113397 prevented the nociception in inflammation. ► Functional and receptor N/OFQ antagonism prevents pain behavior. ► N/OFQ is involved in pain induced by carrageenan inflammation in rats.
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