Effect of miltefosine on erythrocytes

Abstract

BackgroundMiltefosine, an alkylphosphocholine drug with antiparasite, antibacterial, antifungal and antineoplastic potency, is the only oral drug that can be used to treat visceral and cutaneous leishmaniasis. The effect of miltefosine is at least partially due to triggering of apoptosis. Similar to apoptosis of nucleated cells, erythrocytes may enter suicidal death or eryptosis, which is characterized by cell shrinkage and by cell membrane scrambling with phosphatidylserine-exposure at the erythrocyte surface. Eryptosis may be triggered following increase of cytosolic Ca2+-level ([Ca2+]i). The present study explored, whether miltefosine elicits eryptosis. MethodsCell volume has been estimated from forward scatter, phosphatidylserine-exposure from annexin-V-binding, hemolysis from hemoglobin release, [Ca2+]i from Fluo3-fluorescence. ResultsA 48h exposure to miltefosine (⩾4.9μM) was followed by significant decrease of forward scatter and significant increase of annexin-V-binding. The effect was paralleled by significant increase of [Ca2+]i. The annexin-V-binding following miltefosine treatment was significantly blunted in the nominal absence of extracellular Ca2+. ConclusionMiltefosine stimulates eryptosis, an effect at least partially due to stimulation of Ca2+ entry.