title: Enhanced gene expression by a novel stearylated INF7 peptide derivative through fusion independent endosomal escape.
abstract: An octaarginine-modified multifunctional envelope-type nano device (R8-MEND) was previously reported to be an efficient nonviral vector for the delivery of plasmid DNA, in vitro and after topical administration. We report herein on a novel stearylated derivative of the INF7 peptide, a derivative of the N-terminal domain of the HA2 protein of the influenza virus envelope, which enhances the endosomal escape of R8-MEND through a mechanism independent of fusion between the MEND coat and the endosomal membrane. The use of the novel peptide derivative would permit the gene expression of the R8-MEND to be improved, both in vitro and in vivo. R8-MEND modified with stearylated INF7 resulted in gene expression levels that were 77-fold higher than unmodified and 20-fold higher than the free INF7 peptide-modified R8-MEND with no cellular toxicity. Spectral imaging in live cells confirmed that the stearylated INF7 modification did not mediate fusion between liposomes and the endosomal membrane. The inclusion of DOPE to the R8-MEND coat was synergistic with the peptide in improving gene transfection. The intravenous injection of an R8-MEND modified with stearylated INF7 to ICR mice resulted in luciferase expression levels 240-fold higher in liver and 115-fold higher in spleen than that of the R8-MEND.
authors.affiliation: Faculty of Pharmaceutical Sciences, Hokkaido University, Kita 12 Nishi 6, Kita-Ku, Sapporo, Hokkaido 060-0812, Japan.
authors.forename: Ayman
authors.initials: A
authors.lastname: El-Sayed
authors.forename: Tomoya
authors.initials: T
authors.lastname: Masuda
authors.forename: Ikramy
authors.initials: I
authors.lastname: Khalil
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Akita
authors.forename: Hideyoshi
authors.initials: H
authors.lastname: Harashima
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D002470:Cell Survival; D004247:DNA / Q000008:administration & dosage / Q000235:genetics; D004337:Drug Carriers / Q000737:chemistry*; D004339:Drug Compounding; D004705:Endocytosis; D011992:Endosomes / Q000378:metabolism*; D015870:Gene Expression; D018014:Gene Transfer Techniques; D006367:HeLa Cells; D006801:Humans; D008055:Lipids / Q000737:chemistry; D008081:Liposomes; D008156:Luciferases / Q000235:genetics; D008561:Membrane Fusion; D008567:Membranes, Artificial; D051379:Mice; D008813:Mice, Inbred ICR; D018613:Microscopy, Confocal; D049329:Nanostructures / Q000737:chemistry; D009842:Oligopeptides / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry*; D013229:Stearic Acids / Q000737:chemistry*; D013499:Surface Properties; D014162:Transfection
chemical_list: D004337:Drug Carriers; C526981:INF7 peptide; D008055:Lipids; D008081:Liposomes; D008567:Membranes, Artificial; D009842:Oligopeptides; D010455:Peptides; D013229:Stearic Acids; C500307:octa-arginine peptide; D004247:DNA; D008156:Luciferases