title: N-glycan targeted gene delivery to the dendritic cell SIGN receptor.
abstract: A novel nonviral gene delivery vector composed of a high-mannose N-glycan conjugated to a polyacridine peptide was prepared. The glycopeptide was designed to bind to plasmid DNA by a combination of polyintercalation and ionic binding, and to the DC-SIGN (dendritic cell-specific intracellular adhesion molecule-3 grabbing nonintegrin) receptor expressed on CHO cells by recognition of the high-mannose N-glycan. The glycopeptide conjugate was prepared by purification of a high-mannose N-glycan from affinity fractionated soybean agglutinin (SBA). The SBA was proteolyzed to release the N-glycan which was then modified on its N-terminus with Tyr and a propionate maleimide. A DNA binding polyacridine peptide, Cys-(Acr-Lys)(4), was prepared by solid-phase peptide synthesis using Fmoc-Lys(Acr), then conjugated to the maleimide on the N-glycan to produce a glycopeptide. The glycopeptide bound to DNA with high affinity as determined by fluorophore displacement assay and DNA band shift on agarose gel. When bound to Cy5 labeled DNA, the glycopeptide mediated specific uptake in DC-SIGN CHO (+) cells as determined by FACS analysis. In vitro gene transfer studies established that the glycopeptide increased the specificity of gene transfer in DC-SIGN CHO (+) cells 100-fold relative to CHO (-) cells. These studies suggest that a high-mannose N-glycan conjugated to a polyacridine peptide may also facilitate receptor mediated gene delivery in dendritic cells and thereby find utility in the delivery of DNA vaccines.
authors: Divisions of Medicinal and Natural Products Chemistry and Pharmaceutics, College of Pharmacy, University of Iowa, Iowa City, IA 52242, USA.
authors: Kevin
authors: K
authors: Anderson
authors: Christian
authors: C
authors: Fernandez
authors: Kevin G
authors: KG
authors: Rice
mesh_terms: D000166:Acridines / Q000737:chemistry; D000818:Animals; D016466:CHO Cells; D015815:Cell Adhesion Molecules / Q000737:chemistry* / Q000378:metabolism; D006224:Cricetinae; D003412:Cricetulus; D004247:DNA / Q000737:chemistry / Q000378:metabolism; D003713:Dendritic Cells / Q000737:chemistry / Q000378:metabolism; D018014:Gene Transfer Techniques; D005822:Genetic Vectors / Q000138:chemical synthesis / Q000737:chemistry*; D006020:Glycopeptides / Q000138:chemical synthesis / Q000737:chemistry*; D037181:Lectins, C-Type / Q000737:chemistry* / Q000378:metabolism; D008358:Mannose / Q000737:chemistry; D037121:Plant Lectins / Q000737:chemistry; D010957:Plasmids; D011134:Polysaccharides / Q000737:chemistry*; D011956:Receptors, Cell Surface / Q000737:chemistry* / Q000378:metabolism; D030262:Soybean Proteins / Q000737:chemistry; D000099215:DC-Specific ICAM-3 Grabbing Nonintegrin; D010835:Phytohemagglutinins
chemical_list: D000166:Acridines; D015815:Cell Adhesion Molecules; D004247:DNA; D006020:Glycopeptides; D037181:Lectins, C-Type; D008358:Mannose; D037121:Plant Lectins; D011134:Polysaccharides; D011956:Receptors, Cell Surface; D030262:Soybean Proteins; D000099215:DC-Specific ICAM-3 Grabbing Nonintegrin; C028824:soybean lectin; D010835:Phytohemagglutinins