Uptake and efflux of chloroquine by chloroquine-resistant Plasmodium falciparum clones recently isolated in Africa

Riad A.L. Bayoumi, H A Babiker, D E Arnot

Research output: Contribution to journalArticlepeer-review

Abstract

In recently isolated African Plasmodium falciparum clones, the intracellular chloroquine concentration at steady-state, under standard culture conditions, could not differentiate chloroquine-sensitive from resistant parasites. However, under an atmosphere of air the chloroquine-resistant P. falciparum clones released pre-accumulated [3H]chloroquine more rapidly than sensitive clones. The very fast efflux of the pre-accumulated drug from chloroquine-resistant (CQR) parasites resulted in a differential in the drug retained by resistant and sensitive parasites. The chloroquine-sensitive parasites retained 2-3 times more chloroquine than resistant parasites. The steady-state uptake of [3H]chloroquine appeared to be enhanced by verapamil and desipramine in the chloroquine-resistant clones, while the opposite was observed with sensitive clones. This confirmed the suggestion that verapamil inhibits the rapid efflux in CQR parasites resulting in a readily detectable increase in chloroquine accumulation. These observations indicate that the biochemical phenotypes of African chloroquine-resistant P. falciparum are similar to those reported from S.E. Asia and Latin America and are consistent with a common molecular basis for the phenomenon.
Original languageEnglish
Pages (from-to)141-149
Number of pages9
JournalActa Tropica
Volume58
Issue number2
DOIs
Publication statusPublished - Nov 1994

Keywords

  • plasmodium falciparum
  • chloroquine resistance
  • African clones

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