Therapeutic effects of coenzyme Q10 and remacemide in transgenic mouse models of Huntington's disease

There is substantial evidence that bioenergetic defects and excitotoxicity may play a role in the pathogenesis of Huntington's disease (HD). Potential therapeutic strategies for neuro-degenerative diseases in which there is reduced energy metabolism and NMDA-mediated excitotoxicity are the administration of the mitochondrial cofactor coenzyme Q(10) and the NMDA antagonist remacemide. We found that oral administration of either coenzyme Q(10) or remacemide significantly extended survival and delayed the development of motor deficits, weight loss, cerebral atrophy, and neuronal intranuclear inclusions in the R6/2 transgenic mouse model of HD. The combined treatment, using coenzyme Q(10) and remacemide together, was more efficacious than either compound alone, resulting in a similar to32 and 17% increase in survival in the R6/2 and N171-82Q mice, respectively. Magnetic resonance imaging showed that combined treatment significantly attenuated ventricular enlargement in vivo. These studies further implicate defective energy metabolism and excitotoxicity in the R6/2 and N171-82Q transgenic mouse models of HD and are of interest in comparison with the outcome of a recent clinical trial examining coenzyme Q(10) and remacemide in HD patients.