Plasmodium digestive vacuole (DV)

The Plasmodium digestive vacuole (DV), also known as the food vacuole, is a specialized acidic organelle essential for the survival of malaria parasites during their intraerythrocytic stage (Wunderlich et al., 2012). Its primary biological function is the degradation of host hemoglobin to provide a source of amino acids for parasite protein synthesis (Goldberg, 2005). A critical byproduct of this proteolysis is the release of toxic free heme (ferriprotoporphyrin IX), which the parasite detoxifies by converting it into an insoluble crystalline polymer known as hemozoin (Egan, 2008). This organelle is the primary site of action for several classes of antimalarial drugs, most notably the quinolines like chloroquine and quinine, which interfere with the heme detoxification process (Sullivan, 2002). Inhibition of hemozoin formation leads to the accumulation of free heme, which causes oxidative damage to parasite membranes and ultimately results in parasite death (Combrinck et al., 2013). Additionally, the DV membrane contains transporters such as the Plasmodium falciparum chloroquine resistance transporter (PfCRT), which plays a central role in drug resistance by mediating the efflux of drugs away from their site of action (Roepe, 2011).

Other names

Food vacuoleMalarial food vacuoleDigestive vacuoleHeme detoxification pathway

Inhibition of heme biocrystallization (hemozoin formation), leading to the accumulation of toxic free heme (ferriprotoporphyrin IX) which causes oxidative damage and membrane lysis within the parasite (Egan, 2008; Sullivan, 2002). Some drugs also inhibit vacuolar proteases or disrupt the organelle's pH gradient (rxlist.com).