Oxidative Stress Mechanisms in Malaria Pathogenesis
Summary
Malaria infection by Plasmodium species provokes a complex interplay of pro-oxidant and antioxidant processes in both host and parasite. Upon invasion of erythrocytes, the host immune response mobilises phagocytes and upregulates enzymes such as xanthine oxidase, generating reactive oxygen species (ROS) that directly target the parasite. Concurrently, parasite-mediated degradation of haemoglobin liberates free heme, a potent pro-oxidant, which further amplifies oxidative burden. Excessive ROS damage host cell membranes through lipid peroxidation, oxidise proteins and nucleic acids, and contribute to microvascular dysfunction and severe clinical manifestations. To survive, Plasmodium deploys an arsenal of antioxidant enzymes and redox-balanced systems—most notably the glutathione and thioredoxin pathways, along with superoxide dismutase—to detoxify ROS and repair oxidised biomolecules. Perturbations in redox homeostasis influence parasite development, stage conversion and the inflammatory milieu via activation of intracellular signalling complexes. Understanding these mechanisms is crucial for devising adjunctive therapies that restore redox balance, target parasite antioxidant defences and reduce malaria-associated morbidity and mortality.
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Oxidative Stress Mechanisms in Malaria Pathogenesis publication trend
The graph below shows the total number of articles in oxidative stress mechanisms in malaria pathogenesis across all publications each year (not limited to Nature Index journals).
Technical terms
Reactive oxygen species (ROS): Highly reactive oxygen-derived molecules such as superoxide and hydrogen peroxide that can damage cellular components.
Oxidative stress: A state in which the generation of oxidants exceeds the capacity of antioxidant defences, leading to cellular injury.
Antioxidant enzymes: Protein catalysts such as superoxide dismutase and glutathione peroxidase that neutralise ROS.
Free heme: Iron-containing pro-oxidant molecule released during haemoglobin degradation within infected erythrocytes.
Lipid peroxidation: Oxidative degradation of membrane lipids resulting in impaired membrane integrity and cellular dysfunction.
Redox balance: The dynamic equilibrium between reduction and oxidation reactions within a biological system.
References
- Oxidative Stress and Pathogenesis in Malaria. Frontiers in Cellular and Infection Microbiology (2021).
- Malaria inflammation by xanthine oxidase‐produced reactive oxygen species. EMBO Molecular Medicine (2019).
- Understanding the significance of oxygen tension on the biology of Plasmodium falciparum blood stages: From the human body to the laboratory. PLOS Pathogens (2024).
- Effect of Malaria on Blood Levels of Vitamin E: A Systematic Review and Meta-Analysis. Nutrients (2023).
- Oxidative Stress in Malaria: Potential Benefits of Antioxidant Therapy. International Journal of Molecular Sciences (2022).
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