title: Amphiphilic block copolymers enhance cellular uptake and nuclear entry of polyplex-delivered DNA.
abstract: This work for the first time demonstrates that synthetic polymers enhance uptake and nuclear import of plasmid DNA (pDNA) through the activation of cellular trafficking machinery. Nonionic block copolymers of poly(ethylene oxide) and poly(propylene oxide), Pluronics, are widely used as excipients in pharmaceutics. We previously demonstrated that Pluronics increase the phosphorylation of IkappaB and subsequent NFkappaB nuclear localization as well as upregulate numerous NFkappaB-related genes. In this study, we show that Pluronics enhance gene transfer by pDNA/polycation complexes ("polyplexes") in a promoter-dependent fashion. Addition of Pluronic P123 or P85 to polyethyleneimine-based polyplexes had little effect on polyplex particle size but significantly enhanced pDNA cellular uptake, nuclear translocation, and gene expression in several cell lines. When added to polyplex-transfected cells after transfection, Pluronics enhanced nuclear import of pDNA containing NFkappaB binding sites, but have no effect on import of pDNA without these sites. Altogether, our studies suggest that Pluronics rapidly activate NFkappaB, which binds cytosolic pDNA that possesses promoters containing NFkappaB binding sites and consequently increase nuclear import of pDNA through NFkappaB nuclear translocation.
authors: Center for Drug Delivery and Nanomedicine and Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68198-5830, USA.
authors: Zhihui
authors: Z
authors: Yang
authors: Gaurav
authors: G
authors: Sahay
authors: Srikanth
authors: S
authors: Sriadibhatla
authors: Alexander V
authors: AV
authors: Kabanov
mesh_terms: D000818:Animals; D002417:Cattle; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism*; D004247:DNA / Q000378:metabolism*; D004705:Endocytosis / Q000187:drug effects*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D018014:Gene Transfer Techniques; D005822:Genetic Vectors / Q000378:metabolism; D006801:Humans; D008156:Luciferases / Q000378:metabolism; D051379:Mice; D016328:NF-kappa B / Q000378:metabolism; D010316:Particle Size; D010957:Plasmids / Q000235:genetics; D011060:Poloxalene / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D016328:NF-kappa B; D011060:Poloxalene; D004247:DNA; D008156:Luciferases