Protective effect of amiodarone in malaria

According to previous observations, amiodarone triggers suicidal erythrocyte death or eryptosis, which is characterized by cell shrinkage and exposure of phosphatidylserine at the erythrocyte surface. Eryptosis may in turn accelerate the clearance of Plasmodium-infected erythrocytes. The present study tested whether amiodarone augments phosphatidylserine exposure of Plasmodium-infected erythrocytes, interferes with the development of parasitemia and thus influences the course of malaria. The in vitro infection of human erythrocytes with Plasmodium falciparum (strain BinH) increased annexin V-binding, an effect significantly augmented by amiodarone (10 mu M). Amiodarone further significantly decreased intraerythrocytic DNA/RNA content (>= 5 mu M) and in vitro parasitemia (>= 1 mu M). Following infection of mice with Plasmodium berghei ANKA by intraperitoneal injection of parasitized murine erythrocytes (1 x 10(6)) amiodarone (intraperitoneal 50 mg/kg b.w.) significantly decreased the parasitemia and increased the survival of P. berghei-infected mice (from 0% to 70% 26 days after infection). Moreover, treatment with amiodarone significantly increased the percentage of PS-exposing infected erythrocytes. In conclusion, amiodarone inhibits intraerythrocytic growth of P. falciparum, enhances suicidal death of infected erythrocytes, decreases parasitemia following P. berghei infection and supports host survival during malaria. (C) 2010 Elsevier B.V. All rights reserved.