The Open Parasitology Journal
2008, 2 : 55-58Published online 2008 June 30. DOI: 10.2174/1874421400802010055
Publisher ID: TOPARAJ-2-55
RESEARCH ARTICLE
Desynchronizing Cell Cycle Increases Chloroquine Protection at Suboptimal Doses
1
Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
2 Department of Biomedical Sciences, Viale G. Colombo 3, 35121 Padua, Italy
* Address correspondence to this author at the Rua do Matão, travessa 14, n. 321. Cidade Universitária, São Paulo, Brazil 05508-900; Tel: +55(11)30917518; Fax: +55(11)30918095; E-mail: cgarcia@usp.br
2 Department of Biomedical Sciences, Viale G. Colombo 3, 35121 Padua, Italy
* Address correspondence to this author at the Rua do Matão, travessa 14, n. 321. Cidade Universitária, São Paulo, Brazil 05508-900; Tel: +55(11)30917518; Fax: +55(11)30918095; E-mail: cgarcia@usp.br
ABSTRACT
We have previously shown that in vivo and in vitro the hormone melatonin is responsible for the synchronous development of Plasmodia. Melatonin can also mobilize calcium from internal stores in these parasites and this response is abolished by luzindole, a melatonin antagonist. We here demonstrate that in vivo alteration of parasite synchronous development, using luzindole, partially improves survival of infected mice and dramatically increases the antimalarial activity of chloroquine. The data presented may lead to a conceptually new paradigm for malaria infection therapy and provide novel evidence suggesting that the malaria parasite uses the cell cycle synchrony as one of the strategies to evade the host immune system.