Plasmodium spp. cellular redox system

The Plasmodium spp. cellular redox system is a vital metabolic network that maintains oxidative homeostasis in malaria parasites, particularly during the erythrocytic stage where they digest host hemoglobin and release toxic heme (PMID: 12892021). This system primarily consists of the thioredoxin (Trx) and glutathione (GSH) pathways, which are essential for neutralizing reactive oxygen species (ROS) generated during the parasite's rapid growth and host-parasite interactions (PMID: 18474488). Key enzymes within this system, such as thioredoxin reductase (TrxR) and glutathione reductase (GR), provide the reducing power needed for DNA synthesis and the repair of oxidatively damaged proteins (PMID: 12530525). Because Plasmodium parasites lack certain antioxidant defenses found in humans, such as catalase, they are particularly susceptible to disruptions in their redox balance (PMID: 16164554). Many antimalarial drugs, including artemisinins and methylene blue, target this system by inducing oxidative stress or inhibiting these critical enzymes (PMID: 22482475). This system is a major focus of drug discovery because the parasite's redox enzymes often have distinct structural features compared to human orthologs, allowing for selective inhibition. Furthermore, the redox system plays a role in the parasite's resistance mechanisms, making it a key target for overcoming multidrug resistance in Plasmodium falciparum. Monitoring host factors like G6PD activity is crucial when using redox-active drugs to avoid severe side effects like hemolysis (PMID: 24128561).

Other names

Plasmodium antioxidant systemPlasmodium redox metabolismMalaria parasite redox networkPlasmodium thioredoxin-glutathione system

Inhibition of essential antioxidant enzymes such as thioredoxin reductase and glutathione reductase, induction of reactive oxygen species (ROS) through redox cycling, and depletion of the parasite's reduced thiol pool (PMID: 12530525, PMID: 16443313).