Combinatorial Optimization of Sequence-Defined Oligo(ethanamino)amides for Folate Receptor-Targeted pDNA and siRNA Delivery

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Abstract

Cationic polymers present a versatile platform for the nonviral delivery of therapeutic nucleic acids. In order to achieve effective nucleic acid transfer, polymeric carriers ought to comprise multiple functionalities. Precise chemistries for site-specific placements of the different delivery modules within the carriers present the basis for uncovering structure-activity relationships required for further optimization. Here we present the design and systematic evaluation of a library of 42 sequence-defined oligo(ethanamino)amides generated by solid-phase assisted syntheses. The carriers contained two- or four-arm topologies of different artificial oligoamino acid domains for nucleic acid complexation, terminated by cysteines for disulfide-triggered polyplex stabilization, linked with monodisperse polyethylene glycol (PEG) for surface shielding and terminal folic acid for receptor specific cellular uptake. Additional functional elements included histidines for endosomal escape and/or tyrosine trimers for enhanced hydrophobic polyplex stabilization. In vitro screening of the oligomer library identified a folate-PEG-linked two-arm oligocation structure comprising histidines and tyrosine trimers as the most effective class of carriers for the delivery of pDNA and siRNA.

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He, D., Müller, K., Krhac Levacic, A., Kos, P., Lächelt, U., & Wagner, E. (2016). Combinatorial Optimization of Sequence-Defined Oligo(ethanamino)amides for Folate Receptor-Targeted pDNA and siRNA Delivery. Bioconjugate Chemistry, 27(3), 647–659. https://doi.org/10.1021/acs.bioconjchem.5b00649

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