O. Sagredo and M.R. Pazos contributed equally to this work.
Neuroprotective effects of phytocannabinoid-based medicines in experimental models of Huntington's disease
Version of Record online: 14 JUN 2011
Copyright © 2011 Wiley-Liss, Inc.
Journal of Neuroscience Research
Volume 89, Issue 9, pages 1509–1518, September 2011
How to Cite
Sagredo, O., Pazos, M. R., Satta, V., Ramos, J. A., Pertwee, R. G. and Fernández-Ruiz, J. (2011), Neuroprotective effects of phytocannabinoid-based medicines in experimental models of Huntington's disease. J. Neurosci. Res., 89: 1509–1518. doi: 10.1002/jnr.22682
- Issue online: 6 JUL 2011
- Version of Record online: 14 JUN 2011
- Manuscript Accepted: 6 APR 2011
- Manuscript Revised: 20 MAR 2011
- Manuscript Received: 21 JAN 2011
- CIBERNED. Grant Number: CB06/05/0089
- MICINN. Grant Numbers: SAF2006-11333, SAF2009/11847
- CAM. Grant Number: S-SAL-0261/2006
- GW Pharmaceuticals Ltd
- cannabinoid receptors;
- Huntington's disease;
- 3-nitropropionic acid;
- basal ganglia;
We studied whether combinations of botanical extracts enriched in either Δ9-tetrahydrocannabinol (Δ9-THC) or cannabidiol (CBD), which are the main constituents of the cannabis-based medicine Sativex, provide neuroprotection in rat models of Huntington's disease (HD). We used rats intoxicated with 3-nitropropionate (3NP) that were given combinations of Δ9-THC- and CBD-enriched botanical extracts. The issue was also studied in malonate-lesioned rats. The administration of Δ9-THC- and CBD-enriched botanical extracts combined in a ratio of 1:1 as in Sativex attenuated 3NP-induced GABA deficiency, loss of Nissl-stained neurons, down-regulation of CB1 receptor and IGF-1 expression, and up-regulation of calpain expression, whereas it completely reversed the reduction in superoxide dismutase-1 expression. Similar responses were generally found with other combinations of Δ9-THC- and CBD-enriched botanical extracts, suggesting that these effects are probably related to the antioxidant and CB1 and CB2 receptor-independent properties of both phytocannabinoids. In fact, selective antagonists for both receptor types, i.e., SR141716 and AM630, respectively, were unable to prevent the positive effects on calpain expression caused in 3NP-intoxicated rats by the 1:1 combination of Δ9-THC and CBD. Finally, this combination also reversed the up-regulation of proinflammatory markers such as inducible nitric oxide synthase observed in malonate-lesioned rats. In conclusion, this study provides preclinical evidence in support of a beneficial effect of the cannabis-based medicine Sativex as a neuroprotective agent capable of delaying disease progression in HD, a disorder that is currently poorly managed in the clinic, prompting an urgent need for clinical trials with agents showing positive results in preclinical studies. © 2011 Wiley-Liss, Inc.