The development of antibody-based therapeutics crucially relies on the identification of target antigens, which are specifically expressed at the site of disease and which are readily accessible for agents coming from the bloodstream.
In collaboration with ETH Zürich, Philochem has pioneered chemical proteomics methods for the characterization of accessible markers of pathology, which can be drugged by antibodies. In a simple set-up, cell lines can be submitted to surface biotinylation, followed by capture on streptavidin resin and mass spectrometric analysis of tryptic peptides [8, 12]. In a more complex set up, in vivo biotinylation procedures of rodent models of pathology enable the chemical proteomic characterization of vascular proteins, in health an in disease [3, 4, 5, 6, 13]. The technology has been extended to the ex vivo perfusion of surgically-resected human organs with cancer [7, 9, 10].


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