title: Electrochemical impedance spectroscopy to study physiological changes affecting the red blood cell after invasion by malaria parasites.
abstract: The malaria parasite, Plasmodium falciparum, invades human erythrocytes and induces dramatic changes in the host cell. The idea of this work was to use RBC modified electrode to perform electrochemical impedance spectroscopy (EIS) with the aim of monitoring physiological changes affecting the erythrocyte after invasion by the malaria parasite. Impedance cell-based devices are potentially useful to give insight into cellular behavior and to detect morphological changes. The modelling of impedance plots (Nyquist diagram) in equivalent circuit taking into account the presence of the cellular layer, allowed us pointing out specific events associated with the development of the parasite such as (i) strong changes in the host cell cytoplasm illustrated by changes in the film capacity, (ii) perturbation of the ionic composition of the host cell illustrated by changes in the film resistance, (iii) releasing of reducer (lactic acid or heme) and an enhanced oxygen consumption characterized by changes in the charge transfer resistance and in the Warburg coefficient characteristic of the redox species diffusion. These results show that the RBC-based device may help to analyze strategic events in the malaria parasite development constituting a new tool in antimalarial research.
authors.affiliation: Université de Toulouse, UPS, INP, INSA, Laboratoire pharmacochimie des substances naturelles et pharmacophores redox, 118 route de Narbonne, F-31062 Toulouse cedex 9, France.
authors.forename: Clotilde
authors.initials: C
authors.lastname: Ribaut
authors.forename: Karine
authors.initials: K
authors.lastname: Reybier
authors.forename: Olivier
authors.initials: O
authors.lastname: Reynes
authors.forename: Jérôme
authors.initials: J
authors.lastname: Launay
authors.forename: Alexis
authors.initials: A
authors.lastname: Valentin
authors.forename: Paul Louis
authors.initials: PL
authors.lastname: Fabre
authors.forename: Françoise
authors.initials: F
authors.lastname: Nepveu
mesh_terms: D000818:Animals; D001681:Biological Assay / Q000295:instrumentation; D015374:Biosensing Techniques / Q000295:instrumentation*; D002478:Cells, Cultured; D017097:Electric Impedance; D004563:Electrochemistry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D004912:Erythrocytes / Q000166:cytology / Q000469:parasitology* / Q000502:physiology*; D006801:Humans; D010963:Plasmodium falciparum / Q000472:pathogenicity* / Q000502:physiology*; D010992:Plethysmography, Impedance / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity