Abstract
Parkinson’s disease (PD) is related to excess production of reactive oxygen species (ROS) or inadequate and impaired detoxification by endogenous antioxidants, alterations in catecholamine metabolism, alterations in mitochondrial electron transfer function, and enhanced iron deposition in the substantia nigra. The concept that oxidative stress is an important mechanism underlying the degeneration of dopaminergic (DAergic) neurons is reinforced by data documenting that high levels of lipid peroxidation, increased oxidation of proteins and DNA and depletion of glutathione are observed in postmortem studies of brain tissues of PD patients. Tyrosine hydroxylase (TH) is an important neuronal enzyme that, in the presence of tetrahydrobiopterin, catalyzes the initial and rate-limiting step in the biosynthesis of the catecholamine neurotransmitters dopamine (DA) and norepinephrine, and is frequently used as a marker of DAergic neuronal loss in animal models of PD. The role for TH as generators of ROS are highly relevant to PD because ROS have been proposed to contribute to the neurodegeneration of DA neurons. Oxidants and superoxide radicals are produced as byproducts of oxidative phosphorylation, making mitochondria the main site of ROS generation within the cell and the site of the first line of defence against oxidative stress. ROS can affect mitochondrial DNA (mtDNA) causing modulation in synthesis of electron transport chain (ETC) components, decreased ATP production, and increased leakage of ROS.
Keywords: Parkinson's disease, oxidative stress, mitochondria, tyrosine hydroxylase.
CNS & Neurological Disorders - Drug Targets
Title:Mitochondria as an Easy Target to Oxidative Stress Events in Parkinson's Disease
Volume: 11 Issue: 4
Author(s): Marcella Reale, Mirko Pesce, Medha Priyadarshini, Mohammad A Kamal and Antonia Patruno
Affiliation:
Keywords: Parkinson's disease, oxidative stress, mitochondria, tyrosine hydroxylase.
Abstract: Parkinson’s disease (PD) is related to excess production of reactive oxygen species (ROS) or inadequate and impaired detoxification by endogenous antioxidants, alterations in catecholamine metabolism, alterations in mitochondrial electron transfer function, and enhanced iron deposition in the substantia nigra. The concept that oxidative stress is an important mechanism underlying the degeneration of dopaminergic (DAergic) neurons is reinforced by data documenting that high levels of lipid peroxidation, increased oxidation of proteins and DNA and depletion of glutathione are observed in postmortem studies of brain tissues of PD patients. Tyrosine hydroxylase (TH) is an important neuronal enzyme that, in the presence of tetrahydrobiopterin, catalyzes the initial and rate-limiting step in the biosynthesis of the catecholamine neurotransmitters dopamine (DA) and norepinephrine, and is frequently used as a marker of DAergic neuronal loss in animal models of PD. The role for TH as generators of ROS are highly relevant to PD because ROS have been proposed to contribute to the neurodegeneration of DA neurons. Oxidants and superoxide radicals are produced as byproducts of oxidative phosphorylation, making mitochondria the main site of ROS generation within the cell and the site of the first line of defence against oxidative stress. ROS can affect mitochondrial DNA (mtDNA) causing modulation in synthesis of electron transport chain (ETC) components, decreased ATP production, and increased leakage of ROS.
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Cite this article as:
Reale Marcella, Pesce Mirko, Priyadarshini Medha, A Kamal Mohammad and Patruno Antonia, Mitochondria as an Easy Target to Oxidative Stress Events in Parkinson's Disease, CNS & Neurological Disorders - Drug Targets 2012; 11 (4) . https://dx.doi.org/10.2174/187152712800792875
DOI https://dx.doi.org/10.2174/187152712800792875 |
Print ISSN 1871-5273 |
Publisher Name Bentham Science Publisher |
Online ISSN 1996-3181 |
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