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Meschaninova, Mariya I; Entelis, Nina S; Chernolovskaya, Elena L; Venyaminova, Alya G
Molecules (Basel, Switzerland), 04/2021, Letnik: 26, Številka: 8Journal Article
One of the ways to efficiently deliver various drugs, including therapeutic nucleic acids, into the cells is conjugating them with different transport ligands via labile or stable bonds. A convenient solid-phase approach for the synthesis of 5'-conjugates of oligonucleotides with biodegradable pH-sensitive hydrazone covalent bonds is proposed in this article. The approach relies on introducing a hydrazide of the ligand under aqueous/organic media to a fully protected support-bound oligonucleotide containing aldehyde function at the 5'-end. We demonstrated the proof-of-principle of this approach by synthesizing 5'-lipophilic (e.g., cholesterol and α-tocopherol) conjugates of modified siRNA and non-coding RNAs imported into mitochondria (antireplicative RNAs and guide RNAs for Mito-CRISPR/system). The developed method has the potential to be extended for the synthesis of pH-sensitive conjugates of oligonucleotides of different types (ribo-, deoxyribo-, 2'- -methylribo-, and others) with ligands of different nature.
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