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Am. J. Trop. Med. Hyg., 75(4), 2006, pp. 637-639
Copyright © 2006 by The American Society of Tropical Medicine and Hygiene

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SHORT REPORT


IN VITRO ACTIVITY OF ARTEMISONE COMPARED WITH ARTESUNATE AGAINST PLASMODIUM FALCIPARUM

MICHAEL RAMHARTER*, DOMINIK BURKHARDT, JOHANNES NEMETH, AYOLA A. ADEGNIKA, AND PETER G. KREMSNER
Medical Research Unit, Albert Schweitzer Hospital, Lambaréné, Gabon; Department of Internal Medicine I, Division of Infectious Diseases, Medical University of Vienna, Austria; Department of Parasitology, Institute for Tropical Medicine, University of Tübingen, Tübingen, Germany

 

ABSTRACT

Artemisinins show the potential for neurotoxicity in preclinical studies. Artemisone is a leading candidate of second-generation semi-synthetic artemisinin derivatives for antimalarial therapy devoid of neurotoxicity. Artemisone showed 3–5-fold higher in vitro activity (50% effective concentration (EC50) = 0.14 nmol/L, EC90 = 2.55 nmol/L) than artesunate against fresh Plasmodium falciparum isolates from Gabon and a high-activity correlation indicates a shared drug target.

Received April 18, 2006. Accepted for publication June 6, 2006.

Acknowledgments: We are grateful to the children and their parents for participating in this study. We also thank Bayer Healthcare for providing artemisone.

* Address correspondence to Michael Ramharter, Department of Internal Medicine I, Division of Infectious Diseases, Medical University of Vienna, Austria. E-mail: michael.ramharter{at}meduniwien.ac.at

Authors’ addresses: Michael Ramharter and Johannes Nemeth, Medical Research Unit, Albert Schweitzer Hospital, Lambaréné, Ga-bon and Department of Internal Medicine I, Division of Infectious Diseases, Medical University of Vienna, Austria. Dominik Burkhardt, Ayola A. Adegnika, and Peter G. Kremsner, Department of Parasitology, Institute for Tropical Medicine, University of Tübingen, Tübingen, Germany, and Medical Research Unit, Albert Schweitzer Hospital, Lambaréné, Gabon.






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Copyright © 2006 by the American Society of Tropical Medicine and Hygiene.