Preparation of Thermocleavable Conjugates Based on Ansamitocin and Superparamagnetic Nanostructured Particles by a Chemobiosynthetic Approach |
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Authors: | Dr Lena Mancuso Dr Tobias Knobloch Jessica Buchholz Jan Hartwig Dr Lena Möller Katja Seidel Wera Collisi Dr Florenz Sasse Prof Dr Andreas Kirschning |
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Institution: | 1. Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum, Leibniz Universit?t Hannover, Schneiderberg 1B, 30167 Hannover (Germany);2. Abteilung Chemische Biologie, Helmholtz Zentrum für Infektionsforschung (HZI), Inhoffenstra?e?7, 38124 Braunschweig (Germany) |
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Abstract: | A combination of mutasynthesis, precursor‐directed biosynthesis and semisynthesis provides access to new ansamitocin derivatives including new nanostructured particle–drug conjugates. These conjugates are based on the toxin ansamitocin and superparamagnetic iron oxide–silica core shell particles. New ansamitocin derivatives that are functionalized either with alkynyl‐ or azido groups in the ester side chain at C‐3 are attached to nanostructured iron oxide core–silica shell particles. Upon exposure to an oscillating electromagnetic field these conjugates heat up and the ansamitocin derivatives are released by a retro‐Diels–Alder reaction. For example, one ansamitocin derivative exerts strong antiproliferative activity against various cancer cell lines in the lower nanomolar range while the corresponding nanostructured particle‐drug conjugate is not toxic. Therefore, these new conjugates can serve as dormant toxins that can be employed simultaneously in hyperthermia and chemotherapy when external inductive heating is applied. |
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Keywords: | antitumor agents hyperthermia maytansinoids mutasynthesis nanoparticles |
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