Digestive vacuole of Plasmodium falciparum (DV)

The digestive vacuole of Plasmodium falciparum is a specialized, acidic organelle that emerges during the parasite’s blood-stage development inside human red blood cells. It functions similarly to a lysosome and contains numerous proteases—including plasmepsins (aspartic proteases), falcipains (cysteine proteases), and falcilysin (metalloprotease)—that sequentially degrade host hemoglobin. The process releases free heme, which is highly toxic, and must be detoxified into crystalline hemozoin. The DV membrane incorporates various transporters, notably the chloroquine resistance transporter (CRT), which affects drug efficacy and is implicated in resistance. Drugs targeting the DV typically inhibit hemozoin formation or disrupt hemoglobin degradation, causing parasite death. The organelle plays crucial roles in parasite nutrition, waste removal, and osmotic regulation, making it a major target for antimalarial drug development[1][2][4][5].

Other names

Digestive vacuoleFood vacuole

Drugs targeting the DV typically act by inhibiting hemozoin formation, leading to accumulation of toxic free heme, which results in parasite death (e.g., quinoline group including chloroquine, amodiaquine, quinine, mefloquine, piperaquine, lumefantrine). Artemisinin derivatives generate free radicals upon activation by heme, causing damage to parasite organelles and structures. Some novel inhibitors also block hemoglobin trafficking or digestion by targeting proteases within the DV.