PMID: 18719723Aug 23, 2008Paper

In vitro susceptibility of Colombian Plasmodium falciparum isolates to different antimalarial drugs

Biomédica : revista del Instituto Nacional de Salud
Eliana M ArangoSilvia Blair

Abstract

The in vitro assays for susceptibility of Plasmodium falciparum to antimalarial drugs are important tools for monitoring drug resistance, however few such studies have been undertaken in Colombia. P. falciparum isolates were obtained from several municipalities in western Colombia (Urabá, Bajo Cauca, Pacific Coast) and characterized for their in vivo susceptibility to chloroquine (CQ), amodiaquine (AQ), mefloquine (MQ), quinine (QN) and artesunate (AS). Patients with only P. falciparum infection (parasitemia=1,000 rings/microl) were included. Each antimalaria drug was tested with 7 dilutions, two-fold doses, with 2 replications and its effect evaluated using the histidine-rich protein (HRP-2) antigen detection method. Controls included FCB2 (chloroquine-resistant) and NF54 (chloroquine-sensitive) strains. IC50>100, 80, 64, 500 and 10.5 nM were used as the threshold criteria of resistance to CQ, AQ, MQ, QN and AS, respectively. Results. Twenty-five isolates were evaluated from Urabá (18), Bajo Cauca (2) and the Pacific Coast (5). The mean IC50 obtained with CQ, AQ, MQ, QN and AS were 422.9; 131.4; 56.3; 269.7 and 1.9 nM, respectively, and the number of resistant isolates for these drugs was 19 (76%), 4 (16%), 8 (32%), 6 (24%) an...Continue Reading

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