Bioanalytical and biophysical techniques for the elucidation of the mode of action of metal-based drugs.
ABSTRACT Platinum-based drugs present one of the pillars of anticancer chemotherapy, and pharmaceuticals incorporating metals such as ruthenium, gallium, titanium and gold, some of which have already entered clinical trials, show promising features including activity against platinum-resistant tumors and/or reduced side-effects. The mode of action of these novel metallodrugs has only been partly elucidated, and even for established treatments, some questions concerning the interactions with targets such as DNA and proteins on a molecular level remain unanswered. In order to tackle the challenging problem of characterizing the behavior of metallodrugs in complex biological media and tissues in vitro and in vivo, bioanalytical and biophysical methodologies are employed. The current state of these techniques, their strengths and limitations, and the information they can provide for achieving this demanding goal, are described in this review.
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ABSTRACT: An approach to characterize the interactions of RAPTA-T, a novel ruthenium-based anticancer drug candidate with intriguing antimetastatic properties, with human ovarian cancer cells in vitro is described. The distribution profile of the metallodrug within the cancer cells was determined by (size exclusion chromatography)-inductively coupled mass spectrometry combined with subcellular fractionation procedures (metallomics). Multidimensional protein identification technology (MudPIT) was then used to obtain insight into the alteration of the cellular proteome upon RAPTA-T treatment. The metallomics approach reveals striking differences in the intracellular behavior of the drug between cisplatin-sensitive and resistant cell lines and provides clues on possible mechanisms of action as well as detoxification, quantitative proteomics based on spectral counting sheds light on cellular response mechanisms to metallodrug treatment.Metallomics 09/2012; 4(11):1185-96. · 4.10 Impact Factor