title: Serum mannan binding protein inhibits mannosylated liposome-mediated transfection to macrophages.
abstract: The effects of serum mannan binding proteins (MBP) in the transfection of plasmid DNA/Man-liposome complex via mannose receptor-mediated endocytosis was studied in vitro using cultured mouse peritoneal macrophages. Plasmid DNA encoding luciferase gene was complexed with cationic mannosylated liposomes (Man-liposomes), composed of cholesten-5-yloxy-N-(4-((1-imino-2-D-thiomannosylethyl)amino)alkyl)formamide (Man-C4-Chol) and dioleoyl phosphatidylethanolamine (DOPE). The transfection efficiency, as well as the binding and uptake of the plasmid DNA/Man-liposome complex, was investigated with or without serum MBP. The in vitro transfection efficiency of the complex was significantly reduced on increasing the amount of serum MBP. In addition, the cellular association of the complex was also reduced. These results indicate that serum MBP specifically binds to the mannose moieties on the complex and suppresses its cellular uptake, resulting in inhibition of the gene transfection in macrophages. Such an interaction is an obstacle to mannose receptor-mediated in vivo gene transfer to mannose receptor-positive cells using mannosylated gene carriers.
authors.affiliation: Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: P
authors.initials: P
authors.lastname: Opanasopit
authors.forename: K
authors.initials: K
authors.lastname: Hyoudou
authors.forename: M
authors.initials: M
authors.lastname: Nishikawa
authors.forename: F
authors.initials: F
authors.lastname: Yamashita
authors.forename: M
authors.initials: M
authors.lastname: Hashida
mesh_terms: D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism*; D002478:Cells, Cultured; D037222:Collectins; D004247:DNA / Q000378:metabolism; D016503:Drug Delivery Systems / Q000379:methods*; D037181:Lectins, C-Type; D008081:Liposomes / Q000378:metabolism*; D017737:Macrophages, Peritoneal / Q000378:metabolism*; D008297:Male; D008358:Mannose / Q000378:metabolism*; D000090323:Mannose Receptor; D037241:Mannose-Binding Lectins; D051379:Mice; D008813:Mice, Inbred ICR; D010957:Plasmids; D011956:Receptors, Cell Surface / Q000378:metabolism; D014162:Transfection / Q000379:methods*
chemical_list: D002352:Carrier Proteins; D037222:Collectins; D037181:Lectins, C-Type; D008081:Liposomes; D000090323:Mannose Receptor; D037241:Mannose-Binding Lectins; D011956:Receptors, Cell Surface; D004247:DNA; D008358:Mannose