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Brain Res. 2010 Jun 21;1339:18-25. doi: 10.1016/j.brainres.2010.03.105. Epub 2010 Apr 7.

Chronic constriction injury reduces cannabinoid receptor 1 activity in the rostral anterior cingulate cortex of mice.

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Virginia Commonwealth University, Department of Pharmacology and Toxicology, Richmond, VA, USA.


The present studies examined the effect of chronic neuropathic pain on cannabinoid receptor density and receptor-mediated G-protein activity within supraspinal brain areas involved in pain processing and modulation in mice. Chronic constriction injury (CCI) produced a significant decrease in WIN 55,212-2-stimulated [(35)S]GTPgammaS binding in membranes prepared from the rostral anterior cingulate cortex (rACC) of CCI mice when compared to sham-operated controls. Saturation binding with [(3)H]SR 141716A in membranes of the rACC showed no significant differences in binding between CCI and sham mice. Analysis of levels of the endocannabinoids anandamide (AEA) or 2-arachidonoylglycerol (2-AG) in the rACC following CCI showed no significant differences between CCI and sham mice. These data suggest that CCI produced desensitization of the cannabinoid 1 receptor in the rACC in the absence of an overall decrease in cannabinoid 1 receptor density or change in levels of AEA or 2-AG. These data are the first to show alterations in cannabinoid receptor function in the rostral anterior cingulate cortex in response to a model of neuropathic pain.

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