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Modulation of whole-cell currents in Plasmodium falciparum-infected human red blood cells by holding potential and serum

Henry M. Staines, Trevor Powell, J. Clive Ellory, Stéphane Egée *, Franck Lapaix *, Gaëtan Decherf *, Serge L. Y. Thomas *, Christophe Duranton †, Florian Lang † and Stephan M. Huber †

Recent electrophysiological studies have identified novel ion channel activity in the host plasma membrane of Plasmodium falciparum-infected human red blood cells (RBCs). However, conflicting data have been published with regard to the characteristics of induced channel activity measured in the whole-cell configuration of the patch-clamp technique. In an effort to establish the reasons for these discrepancies, we demonstrate here two factors that have been found to modulate whole-cell recordings in malaria-infected RBCs. Firstly, negative holding potentials reduced inward currents (i.e. at negative potentials), although this result was highly complex. Secondly, the addition of human serum increased outward currents (i.e. at positive potentials) by approximately 4-fold and inward currents by approximately 2-fold. These two effects may help to resolve the conflicting data in the literature, although further investigation is required to understand the underlying mechanisms and their physiological relevance in detail.

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