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Permselectivity and pH-dependence of Plasmodium falciparum-induced anion currents in human erythrocytes

  • Ion Channels, Transporters
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Abstract

Intraerythrocytic survival of the malaria pathogen Plasmodium falciparum requires delivery of nutrients and disposal of waste products across the host erythrocyte membrane. Recent patch-clamp experiments have demonstrated inwardly and outwardly rectifying anion conductances in infected but not in control erythrocytes. A ClC-2-generated fraction of the inwardly rectifying current is activated by cell swelling and presumably subserves host cell volume regulation. In contrast, the outwardly rectifying current is insensitive to cell volume but allows the passage of lactate and is involved in the transport of nutrients. The present study was performed to characterize the permselectivity and pH sensitivity of the anion conductances using whole-cell recording. The outwardly rectifying and the inwardly rectifying currents exhibited permselectivities of Cl≥Br≈I>SCN and SCN>I>Br>Cl, respectively, as evident from the reversal potentials recorded under biionic conditions. While the inwardly rectifying current was not affected significantly by alterations of pH between 6.0 and 8.4, the outward rectifier was inhibited strongly by alkalinization to pH≥7.8. Fluxes of 14C-lactate and parasite growth were decreased markedly by the increase of bath pH, an effect that may at least in part be due to inhibition of the outward rectifier and subsequently impaired transport across the erythrocyte membrane.

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Acknowledgements

This study was supported by the “Schwerpunktprogramm Life inside cells” of the Deutsche Forschungsgemeinschaft (DFG, La 315/11-1 and 11-2), by the “Forschungsschwerpunktprogramm des Landes Baden-Württemberg Dynamik und Modulation zellulärer Infektionsprozesse”. C.D. was supported by a grant from the Alexander von Humboldt foundation and C.S. by a Marie Curie fellowship. The authors have no conflicting financial interests.

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Correspondence to Christophe Duranton.

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Duranton, C., Tanneur, V., Brand, V. et al. Permselectivity and pH-dependence of Plasmodium falciparum-induced anion currents in human erythrocytes. Pflugers Arch - Eur J Physiol 450, 335–344 (2005). https://doi.org/10.1007/s00424-005-1415-5

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  • DOI: https://doi.org/10.1007/s00424-005-1415-5

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