Oxidative Stress and Liver Injury Mechanisms

Oxidative stress arises when reactive oxygen and nitrogen species accumulate beyond the capacity of endogenous antioxidant defences, leading to damage of lipids, proteins and nucleic acids. In the liver, a prime site for xenobiotic metabolism, this imbalance is often initiated by cytochrome P450–mediated bioactivation of chemicals into radical intermediates. These radicals trigger lipid peroxidation and membrane disruption in hepatocytes, while resident Kupffer cells release proinflammatory cytokines under the control of NF-κB, and hepatic stellate cells promote fibrogenesis. Adaptive responses driven by the transcription factor Nrf2 induce antioxidant and detoxification enzymes, but chronic or overwhelming insults perpetuate cycles of cell death and regeneration. Over time, this gives rise to steatosis, fibrosis, cirrhosis and, ultimately, hepatocellular carcinoma. Emerging work highlights cross-talk between redox signalling, autophagy and cell-death pathways, as well as the contribution of the gut–liver axis and microbiota to hepatic oxidative injury and repair. A detailed understanding of these interlinked mechanisms opens avenues for targeted therapies to restore redox balance and prevent progressive liver disease.

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Oxidative Stress and Liver Injury Mechanisms publication trend

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

Technical terms

Reactive oxygen species (ROS): Highly reactive derivatives of oxygen that can damage cellular components.

Lipid peroxidation: Oxidative degradation of membrane lipids leading to cell damage.

Cytochrome P450 enzymes: Hepatic monooxygenases that bioactivate xenobiotics into radical intermediates.

Nrf2 (nuclear factor-erythroid 2–related factor 2): Transcription factor regulating antioxidant and detoxification gene expression.

NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells): Transcription factor central to the regulation of inflammatory cytokines.

Hepatocyte: Primary parenchymal cell of the liver responsible for metabolic and detoxification functions.

References

1. Evaluation of the carcinogenicity of carbon tetrachloride. Journal of Toxicology and Environmental Health Part B (2023).
2. The Potential Effects of Quercetin-Loaded Nanoliposomes on Amoxicillin/Clavulanate-Induced Hepatic Damage: Targeting the SIRT1/Nrf2/NF-κB Signaling Pathway and Microbiota Modulation. Antioxidants (2023).
3. Insights into the Role and Interdependence of Oxidative Stress and Inflammation in Liver Diseases. Oxidative Medicine and Cellular Longevity (2016).
4. Poncirin attenuates CCL4-induced liver injury through inhibition of oxidative stress and inflammatory cytokines in mice. BMC Complementary Medicine and Therapies (2020).