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• W1602020336 abstract "Nonviral vectors should undergo “virus-like” changes compatible with the steps of gene delivery. Poly(ethylene) glycol (PEG) shielding of DNA/polycation polyplexes protects from nonspecific interactions with the extracellular environment. pH-triggered removal of the shield within the endosome may be advantageous. Polycation and PEG were linked via acylhydrazides or pyridylhydrazines. The pyridylhydrazone prepared from polylysine and propionaldehyde–PEG showed the greatest acid-dependent hydrolysis; at pH 5, 37°C for 10 min, 90% hydrolyzed, while at pH 7.4 the half-life was 1.5 h. Particle size and ζ potential measurements of the polyplexes showed complete deshielding within 1 h at pH 5, while at pH 7.4 the shield remained at 4 h, 37°C. For gene transfection a targeting conjugate was also included in the polyplex, transferrin as ligand for K562 and Neuro2A cells and epidermal growth factor for HUH-7 and Renca-EGFR cells. Marker gene expression showed that the reversibly shielded polyplexes exhibited up to 2 log orders of magnitude higher gene expression in vitro and 1 log magnitude higher gene expression in an in vivo mouse model, compared to the stably shielded control polyplexes. Engineering of polyplexes with more dynamic domains is an encouraging new direction in nonviral vector design." @default.
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• W1602020336 date "2005-03-01" @default.
• W1602020336 modified "2023-10-18" @default.
• W1602020336 title "Toward Synthetic Viruses: Endosomal pH-Triggered Deshielding of Targeted Polyplexes Greatly Enhances Gene Transfer in vitro and in vivo" @default.
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• W1602020336 doi "https://doi.org/10.1016/j.ymthe.2004.11.006" @default.
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