Journal Article

Artemisinin-Induced Dormancy in <i>Plasmodium falciparum</i>: Duration, Recovery Rates, and Implications in Treatment Failure

Franka Teuscher, Michelle L. Gatton, Nanhua Chen, Jennifer Peters, Dennis E. Kyle and Qin Cheng

in The Journal of Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 202, issue 9, pages 1362-1368
Published in print November 2010 | ISSN: 0022-1899
Published online November 2010 | e-ISSN: 1537-6613 | DOI:
Artemisinin-Induced Dormancy in Plasmodium falciparum: Duration, Recovery Rates, and Implications in Treatment Failure

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Background. Despite the remarkable activity of artemisinin and its derivatives, monotherapy with these agents has been associated with high rates of recrudescence. The temporary arrest of the growth of ring-stage parasites (dormancy) after exposure to artemisinin drugs provides a plausible explanation for this phenomenon.

Methods. Ring-stage parasites of several Plasmodium falciparum lines were exposed to different doses of dihydroartemisinin (DHA) alone or in combination with mefloquine. For each regime, the proportion of recovering parasites was determined daily for 20 days.

Results. Parasite development was abruptly arrested after a single exposure to DHA, with some parasites being dormant for up to 20 days. Approximately 50% of dormant parasites recovered to resume growth within the first 9 days. The overall proportion of parasites recovering was dose dependent, with recovery rates ranging from 0.044% to 1.313%. Repeated treatment with DHA or with DHA in combination with mefloquine led to a delay in recovery and an ∼10-fold reduction in total recovery. Strains with different genetic backgrounds appeared to vary in their capacity to recover.

Conclusions. These results imply that artemisinin-induced arrest of growth occurs readily in laboratory-treated parasites and may be a key factor in P. falciparum malaria treatment failure.

Journal Article.  4461 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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