Cardiomyocyte-targeted siRNA delivery by prostaglandin E(2)-Fas siRNA polyplexes formulated with reducible poly(amido amine) for preventing cardiomyocyte apoptosis.

Biomaterials
Sun Hwa KimD A Bull

Abstract

A cardiomyocyte-targeted Fas siRNA delivery system was developed using prostaglandin E(2) (PGE(2))-modified siRNA polyplexes formed by a reducible poly(amido amine) to inhibit cardiomyocyte apoptosis. PGE(2), which was used as a specific ligand for cardiomyocyte targeting, was conjugated to the terminal-end of the sense siRNA (PGE(2)-siRNA). The reducible cationic copolymer, synthesized via Michael-type polyaddition of 1,6-diaminohexane and cystamine bis-acrylamide (poly(DAH/CBA)), tightly condensed the PGE(2)-siRNA conjugate to form nanosize polyplexes having a diameter of 100-150 nm. The PGE(2)-siRNA/poly(DAH/CBA) polyplexes decomplexed to release PGE(2)-siRNA in a cytosolic reducing environment due to the degradation of the reducible poly(DAH/CBA). The cellular uptake of the PGE(2)-siRNA/poly(DAH/CBA) polyplex was increased in rat cardiomyocytes (H9C2 cells) due to PGE(2) receptor-mediated endocytosis. When H9C2 cells were transfected with siRNA against Fas, a key regulator of ischemia-induced apoptosis, the PGE(2)-Fas siRNA/poly(DAH/CBA) polyplex delivery system led to a significant increase in Fas gene silencing, resulting in inhibition of cardiomyocyte apoptosis. The PGE(2)-Fas siRNA/poly(DAH/CBA) polyplex did not induce ...Continue Reading

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Citations

Mar 23, 2011·Pharmaceutical Research·Ji Hoon JeongSun Hwa Kim
Dec 2, 2011·Accounts of Chemical Research·Sejin SonWon Jong Kim
Dec 6, 2008·Molecular Pharmaceutics·Sun Hwa KimDavid A Bull
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