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Shiyue Duan, Weien Yuan, Fei Wu and Tuo Jin Inside Cover: Polyspermine Imidazole-4,5-imine, a Chemically Dynamic and Biologically Responsive Carrier System for Intracellular Delivery of siRNA (Angew. Chem. Int. Ed. 32/2012) Angewandte Chemie International Edition 51

Article first published online: 23 JUL 2012 | DOI: 10.1002/anie.201205175

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Unlocking the endosome allows the release of siRNAs into the cytoplasm following the cellular uptake of nanoparticles made up of siRNAs and polyspermine imidazole-4,5-imine. In their Communication on page 7938 ff., T. Jin and co-workers show that a polymer of spermine with a pH-sensitive linkage degrades, upon entry into the endosome, into spermine and a nontoxic metabolite. Assays in cells and mice showed effective gene silencing by the polymer-packaged siRNAs without cytotoxicity.

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