Heme-dependent free radical generation (in Plasmodium parasite food vacuole)

In malaria parasites, digestion of host hemoglobin in the food vacuole releases **free heme**, which is normally detoxified via polymerization into hemozoin. Antimalarial drugs such as artemisinin and its derivatives exploit this free heme pool: they are activated by iron-dependent cleavage (typically Fe(II) in heme), leading to **free radical generation**. These highly reactive species cause selective damage to parasite membranes, proteins, and DNA, resulting in parasite death. Inhibition of hemozoin formation enhances the oxidative burden. The mechanism is specific to hemoglobin-digesting parasites (e.g., Plasmodium falciparum), making heme-dependent free radical generation a central target for antimalarial pharmacology[4][5][3][2][1]. Resistance mutations and host toxicity are challenges in targeting this process.

Other names

Free heme-induced oxidative stress in parasitesHeme-catalyzed radical formation in PlasmodiumHeme-activated artemisinin mechanismHeme-mediated ROS generation in malaria

Drug activation by heme-catalyzed cleavage of endoperoxides, generating free radicals that damage parasite biomolecules[4][5][3] Inhibition of heme detoxification (hemozoin formation), augmenting oxidative burden[2]