Protease-Activated Receptor 2 Antagonist Potentiates Analgesic Effects of Systemic Morphine in a Rat Model of Bone Cancer Pain. Issue 2 (March 2015)

• Record Type: Journal Article
• Authors: Bao, Yanju; Hou, Wei; Yang, Liping; Kong, Xiangying; Du, Maobo; Zheng, Honggang; Gao, Yebo; Hua, Baojin
• Is Part Of: Regional anesthesia and pain medicine. Volume 40:Issue 2(2015)
• Publication Date: 2015-03
• Subjects: Conduction anesthesia -- Periodicals; Pain medicine -- Periodicals; 617.964
• DOI: 10.1097/AAP.0000000000000211
• Languages: English
• ISSNs: 1098-7339

Abstract

Abstract : Background and Objectives: Bone cancer pain affects the quality of life of cancer patients. This study was aimed at investigating the analgesic effects of combined therapies with an antagonist of proteinase-activated receptor (PAR) 2 and morphine on pain-related behaviors in a rat model of bone cancer pain. Methods: Female Wistar rats were inoculated intramedullarily with Walker 256 cells into their tibias. The analgesic effects of intraperitoneal treatment with morphine and/or intrathecal with the PAR2 antagonist, FSLLRY-NH2, on bone cancer pain–related behaviors in rats were examined. Results: Treatment with morphine at 3 or 10 mg/kg significantly improved limb-use and weight-bearing scores and reduced the number of spontaneous flinches in rats. Treatment with FSLLRY-NH2 at 10 mmol/L also significantly improved limb use and weight bearing scores, and reduced the number of spontaneous flinches in rats. Combination a sub-analgesic dose of FSLLRY-NH2 (0.1 mmol/L) and morphine further elevated limb-use and weight-bearing scores and reduced the number of flinches compared with the effects of morphine alone in rats. Conclusions: Our data indicate that the combination of morphine and FSLLRY-NH2 has potent analgesic effects on bone cancer pain and our findings may aid in design of new strategies for the treatment of bone cancer pain.