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Single-strand oligonucleotides provide promising potential as new therapeutics towards various diseases. However, the efficient delivery of oligonucleotide therapeutics is still challenging due to their susceptibility to nuclease degradation and the lack of effective carriers for condensation. In this study, we reported the use of natural polyphenol to facilitate the condensation of single-strand oligonucleotides by cationic polymers. Green tea catechin complexed with single-strand oligonucleotides to form anionic nanoparticles, which were further coated by low molecular weight cationic polymers to increase their cell internalization. The resulting core-shell structured nanoparticles, so-called green nanoparticles (GNPs), showed improved cargo stability, and achieved high efficiency in the delivery of several types of single-strand oligonucleotides including antisense oligonucleotides, anti-miRNA, and DNAzyme. This study provides a facile strategy for the efficient delivery of single-strand oligonucleotides.

Natural polyphenol assisted delivery of single-strand oligonucleotides by cationic polymers