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Following invasion of the human erythrocyte by the malaria parasite, Plasmodium falciparum, there appear in the parasitized cell new, high-capacity permeation pathways that transport a diverse range of low-molecular-mass solutes. In this study a series of 16 arylaminobenzoates, analogues of the Cl- channel blocker 5-nitro-2-(3-phenylpropylamino)benzoic acid (NPPB), were tested for their effects on the transport of choline, a univalent cation, into malaria-infected cells. A number of the arylaminobenzoates were found to be potent inhibitors of malaria-induced choline transport and to be similarly effective at blocking the induced transport of the uncharged pyrimidine nucleoside thymidine and the univalent anion lactate. The data are consistent with the hypothesis that much of the induced transport of cations, anions and non-electrolytes into parasitized cells is via broad-specificity, anion-selective pathways of a single type. A comparison of the effects of the arylaminobenzoates on malaria-induced transport with their effects on a number of representative anion transport systems in normal mammalian cells suggests that it is possible to identify pharmacological agents that block the malaria-induced pathway while not significantly affecting important transport mechanisms in host tissues. The most potent of the induced-transport inhibitors identified were shown to inhibit [3H]hypoxanthine incorporation in in vitro parasite growth assays. These data support the view that the induced-transport pathway may be a viable pharmacological target.

biochemical journal

In search of a selective inhibitor of the induced transport of small solutes in <i>Plasmodium falciparum</i>-infected erythrocytes: effects of arylaminobenzoates

In search of a selective inhibitor of the induced transport of small solutes in Plasmodium falciparum-infected erythrocytes: effects of arylaminobenzoates