title: Nuclear targeting peptide scaffolds for lipofection of nondividing mammalian cells.
abstract: Lipofection of nondividing cells is inefficient because much of the transfected DNA is retained in endosomes, and that which escapes to the cytoplasm enters the nucleus at low rates. To improve the final rate-limiting step of nuclear import, we conjugated a nonclassical nuclear localization signal (NLS) containing the M9 sequence of heterogeneous nuclear ribonucleoprotein (hnRNP) A1, to a cationic peptide scaffold derived from a scrambled sequence of the SV40 T-antigen consensus NLS (ScT). The ScT was added to improve DNA binding of the M9 sequence. Lipofection of confluent endothelium with plasmid complexed with the M9-ScT conjugate resulted in 83% transfection and a 63-fold increase in marker gene expression. The M9-ScT conjugate localized fluorescent plasmid into the nucleus of permeabilized cells, and addition of the nuclear pore blocker wheat germ agglutinin prevented nuclear import. This method of gene transfer may lead to viral- and lipid-free transfection of nondividing cells.
authors.affiliation: Institute for Medicine and Engineering, Department of Chemical Engineering, 1010 Vagelos Research Laboratories, University of Pennsylvania, Philadelphia, PA 19104, USA.
authors.forename: A
authors.initials: A
authors.lastname: Subramanian
authors.forename: P
authors.initials: P
authors.lastname: Ranganathan
authors.forename: S L
authors.initials: SL
authors.lastname: Diamond
mesh_terms: D000818:Animals; D000957:Antigens, Viral, Tumor / Q000235:genetics / Q000378:metabolism; D001692:Biological Transport; D002412:Cations; D002417:Cattle; D002451:Cell Compartmentation; D002467:Cell Nucleus / Q000378:metabolism*; D004730:Endothelium, Vascular / Q000166:cytology*; D000076245:Heterogeneous Nuclear Ribonucleoprotein A1; D034481:Heterogeneous-Nuclear Ribonucleoprotein Group A-B; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D008081:Liposomes; D019913:Nuclear Localization Signals; D010446:Peptide Fragments / Q000235:genetics / Q000378:metabolism; D021382:Protein Sorting Signals / Q000235:genetics / Q000378:metabolism; D012261:Ribonucleoproteins / Q000235:genetics / Q000378:metabolism; D013539:Simian virus 40; D014162:Transfection / Q000379:methods*
chemical_list: D000957:Antigens, Viral, Tumor; D002412:Cations; D000076245:Heterogeneous Nuclear Ribonucleoprotein A1; D034481:Heterogeneous-Nuclear Ribonucleoprotein Group A-B; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D008081:Liposomes; D019913:Nuclear Localization Signals; D010446:Peptide Fragments; D021382:Protein Sorting Signals; D012261:Ribonucleoproteins