Oxidative Stress and Protein Modification Mechanisms

Oxidative stress arises when the generation of reactive oxygen species overwhelms cellular antioxidant defences, leading to damage of biomolecules. Central to this process is lipid peroxidation, which yields electrophilic aldehydes and dicarbonyls that readily form covalent adducts with nucleophilic amino acid side chains. Such protein modifications can induce conformational changes, crosslinking and loss of enzymatic or structural function. Key pathways include enzymatic sources of oxidants, notably NADPH oxidases, and redox-sensitive transcriptional responses mediated by factors such as Nrf2. Proteomic studies have mapped widespread susceptibility of metabolic enzymes, structural proteins and signalling mediators to oxidative adduction, linking these events to chronic diseases including fibrotic lung disorders, cardiovascular dysfunction, neurodegeneration and ageing. Emerging therapeutic strategies focus on selective scavengers of reactive lipid-derived electrophiles, designed to prevent pathological adduct formation while preserving essential redox signalling. Understanding the interplay between oxidative insult, protein modification and adaptive responses is crucial for identifying biomarkers and developing targeted interventions that mitigate disease progression.

Research from Nature Portfolio

Recent studies have elucidated genetic regulation of γ-ketoaldehyde-mediated protein modification, demonstrating that the transcription factor Nrf2 and the oxidase Nox2 govern the extent of adduct formation in pulmonary tissue. Proteomic analyses using affinity purification and mass spectrometry have mapped a broad array of lysine-containing targets across metabolic, structural and signalling pathways. Exceeding basal modification thresholds was shown to induce apoptotic cascades, while in models of radiation-induced and idiopathic pulmonary fibrosis, elevated adduct levels correlated with tissue remodelling and fibrotic progression. These findings support a mechanistic link between oxidative lipid peroxidation and lung injury, and highlight adduct quantification as a potential biomarker and therapeutic endpoint in fibrotic disease.

Oxidative Stress and Protein Modification Mechanisms publication trend

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

Technical terms

Oxidative stress: A condition arising from an imbalance between reactive oxygen species production and antioxidant defences.

Reactive oxygen species (ROS): Highly reactive molecules derived from oxygen, including superoxide, hydrogen peroxide and hydroxyl radicals.

Lipid peroxidation: Oxidative degradation of polyunsaturated lipids yielding electrophilic aldehydes and dicarbonyls.

γ-Ketoaldehydes (IsoLGs): Highly reactive lipid-derived electrophiles that covalently modify nucleophilic residues, notably lysine.

Protein adduct: A covalent modification of a protein by an external electrophilic species, often altering structure and function.

References

1. Scavenging Reactive Lipids to Prevent Oxidative Injury. The Annual Review of Pharmacology and Toxicology (2020).
2. Accumulation of isolevuglandin-modified protein in normal and fibrotic lung. Scientific Reports (2016).
3. Highly Reactive Isolevuglandins Promote Atrial Fibrillation Caused by Hypertension. JACC Basic to Translational Science (2020).
4. Safety, tolerability, and pharmacokinetics of repeated oral doses of 2-hydroxybenzylamine acetate in healthy volunteers: a double-blind, randomized, placebo-controlled clinical trial. BMC Pharmacology and Toxicology (2020).