Abstract Nanoparticles show great potential for
drug delivery. However, suitable nanostructures capable of loading a
range of drugs (including hydrophobic/hydrophilic small molecules or
biomolecular agents) together with the codelivery of siRNAs that avoid
the problem of cation-associated cytotoxicity, are lacking. Herein, we
report a novel, siRNA-based vesicle (siRNAsome) nanostructure which
consists of a hydrophilic siRNA shell, a thermal and intracellular
reduction sensitive hydrophobic median layer, and an empty aqueous
interior that meets this need. The siRNAsome can serve as a versatile
nanostructure to load drug agents with divergent chemical properties,
therapeutic proteins as well as codelivering immobilized siRNAs without
transfection agents. Importantly, a particular advantage of our
siRNAsome is that inherent thermal/reduction responsiveness enables it
to control drug loading and release. We show that when siRNAsomes are
loaded with the hydrophilic drug doxorubicin hydrochloride (Dox·HCl) and
anti-P-glycoprotein (Pgp) siRNA (to target the Pgp drug exporter),
synergistic therapeutic activity is achieved in multidrug resistant
(MDR) cancer cells and tumor model. 10.1002@anie.201814289.pdf
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