PMID: 15224144Jun 30, 2004Paper

Differential actions of intrathecal nociceptin on persistent spontaneous nociception, hyperalgesia and inflammation produced by subcutaneous bee venom injection in conscious rats

Sheng li xue bao : [Acta physiologica Sinica]
Yan-Yan SunJun Chen

Abstract

Nociceptin is an endogenous ligand for the opioid receptor-like 1 (ORL1) receptor. The present study was designed to investigate spinal actions of nociceptin on the spontaneous nociception, hyperalgesia and inflammation induced by subcutaneous bee venom injection. Subcutaneous injection of bee venom into one hindpaw of conscious rat produced a persistent spontaneous nociception followed by a long-lasting primary heat and mechanical hyperalgesia as well as local inflammation. Compared with the pre-saline group, pretreatment with intrathecal injection of three doses (3, 10 and 30 nmol) of nociceptin produced significant suppression on the spontaneous paw flinching reflex. The inhibitory rates were 37+/-7, 43+/-6 and 57+/-11%, respectively, which were enhanced with an increase in the concentration of nociceptin. The inhibitory action of nociceptin was completely antagonized by a new selective ORL1 receptor antagonist CompB (30 nmol). Pre-treatment with 10 nmol nociceptin prior to bee venom produced no significant effect on the occurrence of primary heat and mechanical hyperalgesia, nor did post-treatment with the same dose again 3 h after bee venom injection. Additionally, pre-treatment with nociceptin had no effect on the bee ven...Continue Reading

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