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Is the Deficiency of Vitamin B12 Related to Oxidative Stress and Neurotoxicity in Parkinson's Patients? *

This review deals with the results showing the relation between vitamin B12 deficiency and neurotoxicity of homocysteine and nitrite (a metabolite of nitric oxide) in Parkinson's patients treated with levodopa (L-Dopa). We have already reported a linear relationship between the CSF levels of nitrite with glutamic acid and homocysteine suggesting that the production of nitrite is interrelated with the neurotoxic level of homocysteine.
The levels of nitrite and homocysteine resulting in the deficiency of vitamin B12 are some of the factors promoting degeneration in Parkinson's disease. This review emphasizes the importance of these parameters in designing suitable drug therapy for Parkinson disease. Additionally, there is evidence that increased homocysteine levels might accelerate dopaminergic cell death in Parkinson disease (PD), through neurotoxic effects. Furthermore, levodopa (L-Dopa) treatment of PD results in hyperhomocysteinemia as a consequence of L-Dopa methylation by catechol-O-methyltransferase (COMT). Therefore, higher dietary intakes of folate, vitamin B12, and vitamin B6 might decrease the risk of PD through decreasing plasma homocysteine.

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THE INFORMATION IN THIS WEBSITE IS OFFERED FOR GENERAL EDUCATIONAL PURPOSES ONLY AND DOES NOT IMPLY OR GIVE MEDICAL ADVICE. No Doctor/Patient relationship shall be deemed to have arisen simply by reading the information contained on these pages, and you should consult with your personal physician/care giver regarding your medical treatment before undergoing any sort of treatment or therapy.

Published on 08-11-2008
Authors: Qureshi, G. A.; Qureshi, Aftab A.; Devrajani, Bika R.a.m.; Chippa, M. A.; Syed, S. A.l.i.
Source: CNS & Neurological Disorders - Drug Targets (Formerly Current Drug Targets - CNS & Neurological Disorders),, Volume 7, Number 1, February 2008 , pp. 20-27(8),