Cationic liposomes enhance adenovirus entry via a pathway independent of the fiber receptor and alpha(v)-integrins

Human Gene Therapy
C QiuD A Dichek

Abstract

The ability of adenoviral vectors to mediate efficient gene delivery both in vitro and in vivo is limited by the availability of specific cell surface receptors and alpha(v)-containing integrins. We tested whether this limitation could be overcome by enhancing viral entry with cationic liposomes. In cultured vascular smooth muscle cells, delivery of adenoviral vectors in the presence of cationic liposomes increased vector-encoded transgene expression up to 20-fold. The increase in transgene expression was associated with the formation of adenovirus-lipid aggregates and an increase in the amount of vector DNA in the cells, suggesting that enhanced viral entry was responsible for the increase in gene expression. Treatment of the cells with an RGD-containing peptide or adenovirus type 5 fiber protein did not diminish liposome enhancement of transgene expression, indicating that liposomes increase viral entry via a pathway independent of the fiber receptor and of alpha(v) integrin-assisted endocytosis. Liposomes also significantly enhanced transgene expression from adenoviral vectors delivered to cells deficient in alpha(v)-containing integrins. The magnitude of liposome enhancement of transgene expression in cultured smooth muscle...Continue Reading

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