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Coenzyme Q10 does not improve Parkinson's disease symptoms

Small doses of the antioxidant coenzyme Q10 appear to increase blood levels of this naturally occurring compound in patients with Parkinson's disease, but does not improve Parkinson's disease symptoms, according to an article posted online today that will appear in the July 2007 print issue of Archives of Neurology, one of the JAMA/Archives journals.

Parkinson's disease is a neurodegenerative disorder characterized by tremors and difficulty with walking or other movements. The biological mechanisms underlying the condition are not fully understood, but researchers suspect a malfunction of the mitochondria, parts of the cells that help convert food to energy, according to background information in the article. Coenzyme (CoQ10), an antioxidant sold as a dietary supplement, is also involved in mitochondrial processes. "Because of these functions, CoQ10 has attracted attention concerning neuroprotective actions in neurodegenerative disorders linked to mitochondrial defects or oxidative [oxygen-related] stress, such as Huntington's disease and Parkinson's disease," the authors write. Previous studies indicate that high doses of CoQ10 (1,200 milligrams) may slow the deterioration associated with Parkinson's disease.

Alexander Storch, M.D., of the Technical University of Dresden, Germany, and colleagues conducted a randomized clinical trial of a 300-milligram dose of CoQ10 in 131 patients with Parkinson's disease who did not have changes in motor functions and were on stable treatment for their condition. Those assigned to the treatment group took 100 milligrams of CoQ10 three times daily for three months, followed by a two-month "washout" period. The researchers assessed Parkinson's disease symptoms before treatment began, each month during treatment and again after the washout period. Blood tests were performed at the beginning of the study, after three months of treatment and after the washout period.

A total of 106 patients completed th
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Contact: Alexander Storch
Alexander.Storch@neuro.med.tu-dresden.de
JAMA and Archives Journals
14-May-2007


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