Opening up the advantages of the ruthenocenic bioprobes of ferroquine: distribution and localization in Plasmodium falciparum-infected erythrocytes

Literature Information

Publication Date 2012-05-04
DOI 10.1039/C2MT20063E
Impact Factor 0
Authors

Christophe Biot, Faustine Dubar, Jamal Khalife, Christian Slomianny


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Abstract

A ferrocene–quinoline conjugate named ferroquine (FQ or SSR97193) is active against both chloroquine-susceptible and chloroquine-resistant Plasmodium falciparum and P. vivax strains and/or isolates. FQ was shown to be efficient for the treatment of uncomplicated malaria in humans (phase IIb of clinical trials). However, the molecular basis of FQ's mechanism of action is still unknown because few approaches (such as radioactive labelling or immunofluorescence) are available for that purpose. Previous reports from our laboratory suggest that the intramolecular hydrogen bond in the lateral side chain plays a crucial role in the antimalarial activity of the drug. We used two ruthenocenic bioprobes of FQ (with and without an intramolecular hydrogen bond) to study their localization and quantification in Plasmodium falciparum-infected erythrocytes. We first used Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) analysis to trace ruthenoquine (RQ, with an intramolecular hydrogen bond) and methylruthenoquine (Me-RQ, without an intramolecular hydrogen bond) in the infected red blood cells (iRBCs). We showed that RQ accumulates faster in the digestive vacuole of the iRBCs than Me-RQ. We next examined the ruthenium distribution at the ultrastructural level by transmission electron microscopy (TEM). We showed that RQ accumulates faster in the parasitic digestive vacuole (DV) close to its membranes than Me-RQ.

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Source Journal

Metallomics

Metallomics
CiteScore: 7
Self-citation Rate: 6.9%
Articles per Year: 77

Metallomics publishes cutting-edge investigations aimed at elucidating the identification, distribution, dynamics, role and impact of metals and metalloids in biological systems. Studies that address the “what, where, when, how and why” of these inorganic elements in cells, tissues, organisms, and various environmental niches are welcome, especially those employing multidisciplinary approaches drawn from the analytical, bioinorganic, medicinal, environmental, biophysical, cell biology, plant biology and chemical biology communities. We are particularly interested in articles that enhance our chemical and/or physical understanding of the molecular mechanisms of metal-dependent life processes, and those that probe the common space between metallomics and other ‘omics approaches to uncover new insights into biological processes. Metallomics seeks to position itself at the forefront of those advances in analytical chemistry destined to clarify the enormous complexity of biological systems. As such, we particularly welcome those papers that outline cutting-edge analytical technologies, e.g., in the development and application of powerful new imaging, spectroscopic and mass spectrometric modalities. Work that describes new insights into metal speciation, trafficking and dynamics in complex systems or as a function of microenvironment are also strongly encouraged. Studies that examine the interconnectivity of metal-dependent processes with systems level responses relevant to organismal health or disease are also strongly encouraged, for example those that probe the effect of chemical exposure on metal homeostasis or the impact of metal-based drugs on cellular processes.

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