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The Maintenance of Cisplatin- and Paclitaxel-Induced Mechanical and Cold Allodynia is Suppressed by Cannabinoid CB2 Receptor Activation and Independent of CXCR4 Signaling in Models of Chemotherapy-Induced Peripheral Neuropathy

Background: Chemotherapeutic agents produce dose-limiting peripheral neuropathy through mechanisms that remain poorly understood. We previously showed that AM1710, a cannabilactone 2 agonist, produces antinociception without producing central nervous system (CNS)-associated side effects. The present...

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Bibliographic Details
Published in:Molecular pain 2012-09, Vol.8 (1), p.71-71
Main Authors: Deng, Liting, Guindon, Josée, Vemuri, V Kiran, Thakur, Ganesh A, White, Fletcher A, Makriyannis, Alexandros, Hohmann, Andrea G
Format: Article
Language:English
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HIV
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Summary:Background: Chemotherapeutic agents produce dose-limiting peripheral neuropathy through mechanisms that remain poorly understood. We previously showed that AM1710, a cannabilactone 2 agonist, produces antinociception without producing central nervous system (CNS)-associated side effects. The present study was conducted to examine the antinociceptive effect of AM1710 in rodent models of neuropathic pain evoked by diverse chemotherapeutic agents (cisplatin and paclitaxel). A secondary objective was to investigate the potential contribution of alpha-chemokine receptor (CXCR4) signaling to both chemotherapy-induced neuropathy and CB2 agonist efficacy. Results: AM1710 (0.1, 1 or 5 mg/kg i.p.) suppressed the maintenance of mechanical and cold allodynia in the cisplatin and paclitaxel models. Anti-allodynic effects of AM1710 were blocked by the CB2 antagonist AM630 (3 mg/kg i.p.), but not the CB1 antagonist AM251 (3 mg/kg i.p.), consistent with a CB2-mediated effect. By contrast, blockade of CXCR4 signaling with its receptor antagonist AMD3100 (10 mg/kg i.p.) failed to attenuate mechanical or cold hypersensitivity induced by either cisplatin or paclitaxel. Moreover, blockade of CXCR4 signaling failed to alter the anti-allodynic effects of AM1710 in the paclitaxel model, further suggesting distinct mechanisms of action. Conclusions: Our results indicate that activation of cannabinoid CB2 receptors by AM1710 suppresses both mechanical and cold allodynia in two distinct models of chemotherapy-induced neuropathic pain. By contrast, CXCR4 signaling does not contribute to the maintenance of chemotherapy-induced established neuropathy or efficacy of AM1710. Our studies suggest that CB2 receptors represent a promising therapeutic target for the treatment of toxic neuropathies produced by cisplatin and paclitaxel chemotherapeutic agents.
ISSN:1744-8069
1744-8069
DOI:10.1186/1744-8069-8-71