Role of Oxidative Stress and Antioxidant Defense Biomarkers in Neurodegenerative Diseases.

Oxidative stress is caused by an imbalance in a redox system. It may involve either excessive production of reactive oxygen species or dysfunction of the antioxidant defense system. Unlike other viscera, the brain is especially highly susceptible to oxidative damage because of it requires a high oxygen level and contains an abundance of peroxida-tion-susceptible lipid cells. Oxidative stress is among the common etiological factors involved in neurodegeneration. To measure The extent of oxidative stress is measured with several indicators or biomarkers that are known to arise from oxidation of major biomolecules, including lipids, proteins, carbohydrates, and nucleic acids. In this review, we will discuss oxidative stress biomarkers associated with neurodegenerative diseases, for instance, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, and Huntington's disease. We will also highlight the biomarkers of antioxidant defense mechanisms that are impaired in these diseases.