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A Single Intrathecal or Intraperitoneal Injection of CB2 Receptor Agonist Attenuates Bone Cancer Pain and Induces a Time-Dependent Modification of GRK2.

Authors: Lu, Cui'e  Shi, Linyu  Sun, Bei  Zhang, Yu  Hou, Bailing  Sun, Yu'e  Ma, Zhengliang  Gu, Xiaoping 
Citation: Lu C, etal., Cell Mol Neurobiol. 2017 Jan;37(1):101-109. doi: 10.1007/s10571-016-0349-0. Epub 2016 Mar 2.
Pubmed: (View Article at PubMed) PMID:26935064
DOI: Full-text: DOI:10.1007/s10571-016-0349-0

The objective of this study was to explore the potential role of G-protein-coupled receptor kinase 2 (GRK2) in the progression of cannabinoid 2 receptor (CB2) agonist-induced analgesic effects of bone cancer pain. Female Sprague-Dawley rats, weighing 160-180 g, were utilized to establish a model of bone cancer pain induced by intra-tibia inoculation of Walker 256 mammary gland carcinoma cells. JWH-015, a selective CB2 agonist, was injected intrathecally or intraperitoneally on postoperative day 10. Bone cancer-induced pain behaviors-mechanical allodynia and ambulatory pain-were assessed on postoperative days -1 (baseline), 4, 7, and 10 and at post-treatment hours 2, 6, 24, 48, and 72. The expressions of spinal CB2 and GRK2 protein were detected by Western Blotting on postoperative days -1 (baseline), 4, 7, and 10 and at post-treatment hours 6, 24, and 72. The procedure produced prolonged mechanical allodynia, ambulatory pain, and different changes in spinal CB2 and GRK2 expression levels. Intrathecal or intraperitoneal administration of JWH-015 alleviated the induced mechanical allodynia and ambulatory pain, and inhibited the downregulation of spinal GRK2 expression. These effects were in a time-dependent manner and reversed by pretreatment of CB2 selective antagonist AM630. The results affirmed CB2 receptor agonists might serve as new treatment targets for bone cancer pain. Moreover, spinal GRK2 was an important regulator of CB2 receptor agonist-analgesia pathway.

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CRRD Object Information
CRRD ID: 13513996
Created: 2018-03-20
Species: All species
Last Modified: 2018-03-20
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.