Peptide nucleic acid (PNA) cell penetrating peptide (CPP) conjugates as carriers for cellular delivery of antisense oligomers.

Artificial DNA, PNA & XNA
Takehiko Shiraishi, Peter E Nielsen

Abstract

We have explored the merits of a novel delivery strategy for the antisense oligomers based on cell penetrating peptide (CPP) conjugated to a carrier PNA with sequence complementary to part of the antisense oligomer. The effect of these carrier CPP-PNAs was evaluated by using antisense PNA targeting splicing correction of the mutated luciferase gene in the HeLa pLuc705 cell line, reporting cellular (nuclear) uptake of the antisense PNA via luciferase activity measurement. Carrier CPP-PNA constructs were studied in terms of construct modification (with octaarginine and/or decanoic acid) and carrier PNA length (to adjust binding affinity). In general, the carrier CPP-PNA constructs including the ones with decanoyl modification provided significant increase of the activity of unmodified antisense PNA as well as of antisense octaarginine-PNA conjugates. Antisense activity, and by inference cellular delivery, of unmodified antisense PNA was enhanced at least 20-fold at 6 μM upon the complexation with an equimolar amount of nonamer carrier decanoyl-CPP-PNA (Deca-cPNA1(9)-(D-Arg)8). The antisense activity of a CPP-PNA ((D-Arg)8-asPNA) (at 2 μM) was improved 6-fold and 8-fold by a heptamer carrier CPP-PNA (cPNA1(7)-(D-Arg)8) and hexamer...Continue Reading

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