Novel Lipid-Oligonucleotide Conjugates Containing Long-Chain Sulfonyl Phosphoramidate Groups: Synthesis and Biological Properties

New lipid conjugates of DNA and RNA incorporating one to four [(4-dodecylphenyl)sulfonyl]phosphoramidate or (hexadecylsulfonyl)phosphoramidate groups at internucleotidic positions near the 3 ' or 5 '-end were synthesized and characterized. Low cytotoxicity of the conjugates and their ability to be taken up into cells without transfection agents were demonstrated. Lipid-conjugated siRNAs targeting repulsive guidance molecules a (RGMa) have shown a comparable gene silencing activity in PK-59 cells to unmodified control siRNA when delivered into the cells via Lipofectamine mediated transfection.

Automated summary

Novel lipid-conjugated DNA and RNA derivatives with low cytotoxicity and efficient cellular uptake without transfection agents were synthesized. Lipid-conjugated siRNAs targeting RGMa showed comparable gene silencing activity to unmodified control siRNA when delivered into cells via Lipofectamine-mediated transfection.