Oxidative Stress Mechanisms in Neurodegenerative Diseases

Oxidative stress arises when generation of reactive oxygen species (ROS) overwhelms endogenous antioxidant defences, leading to damage of lipids, proteins and nucleic acids. In the central nervous system, high metabolic demand, abundant polyunsaturated lipids and relatively weak antioxidant capacity render neurons especially vulnerable. Mitochondrial dysfunction is both a source and consequence of oxidative imbalance: impaired electron transport increases ROS production, while oxidative damage further compromises ATP synthesis. Lipid peroxidation disrupts membrane integrity, protein oxidation alters enzyme activity and aggregation of misfolded proteins exacerbates redox imbalance. DNA oxidation and impaired repair contribute to genomic instability and cell death. In Alzheimer’s disease, oxidative modifications promote amyloid-β aggregation and tau hyperphosphorylation, establishing a vicious cycle of redox disruption and proteinopathy. In Parkinson’s disease, dopaminergic neurons of the substantia nigra exhibit selective vulnerability due to high iron content and dopamine metabolism that generates ROS. Amyotrophic lateral sclerosis and Huntington’s disease also feature mitochondrial impairment, excitotoxicity and neuroinflammation that amplify oxidative damage. Understanding these interconnected pathways has global significance for developing biomarkers of redox status and targeting antioxidant or mitochondria-protective therapies to slow progression of neurodegenerative disorders.

Research from Nature Portfolio

Recent studies have illuminated genetic modulation of oxidative stress in Alzheimer’s pathology. Investigation of a common aldehyde dehydrogenase variant revealed that reduced enzyme activity leads to accumulation of lipid aldehydes, notably 4-hydroxynonenal, which adduct to amyloid precursor fragments and shift production towards plaque-forming amyloid-β species. This work clarifies how inherited differences in aldehyde clearance can influence amyloid burden, inflammatory responses and phagocytic clearance in the ageing brain. Such mechanistic insight underscores the role of lipid peroxidation products as drivers of protein aggregation and suggests routes to bolster endogenous detoxification pathways.

Oxidative Stress Mechanisms in Neurodegenerative Diseases publication trend

The graph below shows the total number of articles in oxidative stress mechanisms in neurodegenerative diseases across all publications each year (not limited to Nature Index journals).

Technical terms

Reactive oxygen species (ROS): Chemically reactive molecules derived from oxygen, including superoxide and hydrogen peroxide, that can damage cellular components when in excess.

Lipid peroxidation: Chain-reaction oxidative degradation of polyunsaturated fatty acids in membranes, leading to altered permeability and generation of toxic aldehydes.

Mitochondrial dysfunction: Impairment of the mitochondrial electron transport chain and ATP synthesis, often accompanied by increased ROS generation.

Redox homeostasis: Balanced regulation of oxidation–reduction reactions within cells, maintained by antioxidants and repair systems to prevent oxidative damage.

References

1. Oxidative Stress: A Key Modulator in Neurodegenerative Diseases. Molecules (2019).
2. The aldehyde dehydrogenase 2 rs671 variant enhances amyloid β pathology. Nature Communications (2024).
3. Neurodegenerative disorders: Mechanisms of degeneration and therapeutic approaches with their clinical relevance. Ageing Research Reviews (2024).
4. Oxidative stress and inflammation in the pathogenesis of neurological disorders: Mechanisms and implications. Acta Pharmaceutica Sinica B (2024).
5. Oxidative Stress in Neurodegenerative Diseases: From Molecular Mechanisms to Clinical Applications. Oxidative Medicine and Cellular Longevity (2017).
6. Oxidative stress in the aging substantia nigra and the etiology of Parkinson's disease. Aging Cell (2019).