title: A novel near-infrared indocyanine dye-polyethylenimine conjugate allows DNA delivery imaging in vivo.
abstract: Near-infrared (NIR) fluorescence light has been applied to monitor several biological events in vivo since it penetrates tissues more efficiently than visible light. Dyes exhibiting NIR fluorescence and having large Stokes shift are key elements for this promising optical imaging technology. Here, we report the synthesis of a novel conjugate between a near-infrared indocyanine dye and an organic polyamine polymer (polyethylenimine, PEI) (IR820-PEI) with high chemical stability and good optical properties. IR820-PEI absorbs at 665 nm, emits at 780 nm, and displays a large Stokes shift (115 nm). Moreover, the reported conjugate is able to bind DNA, and the delivery process can be monitored in vivo with noninvasive optical imaging techniques. These characteristics make IR820-PEI one of the most effective and versatile indocyanine dye polymeric-conjugate reported so far.
authors.affiliation: Chemistry Department, SAPIENZA Università di Roma, P.le Aldo Moro 5, 00185 Rome, Italy. andrea.masotti@uniroma1.it
authors.forename: Andrea
authors.initials: A
authors.lastname: Masotti
authors.forename: Paola
authors.initials: P
authors.lastname: Vicennati
authors.forename: Federico
authors.initials: F
authors.lastname: Boschi
authors.forename: Laura
authors.initials: L
authors.lastname: Calderan
authors.forename: Andrea
authors.initials: A
authors.lastname: Sbarbati
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Ortaggi
mesh_terms: D000818:Animals; D004247:DNA / Q000737:chemistry* / Q000235:genetics / Q000493:pharmacokinetics; D003952:Diagnostic Imaging / Q000379:methods*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry* / Q000493:pharmacokinetics; D018014:Gene Transfer Techniques; D005822:Genetic Vectors / Q000138:chemical synthesis / Q000737:chemistry* / Q000493:pharmacokinetics; D006575:Heterocyclic Compounds, 3-Ring / Q000138:chemical synthesis / Q000737:chemistry* / Q000493:pharmacokinetics; D007208:Indocyanine Green / Q000138:chemical synthesis / Q000737:chemistry* / Q000493:pharmacokinetics; D051379:Mice; D008819:Mice, Nude; D015394:Molecular Structure; D011094:Polyethyleneimine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry* / Q000493:pharmacokinetics; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods; D019265:Spectroscopy, Near-Infrared / Q000379:methods
chemical_list: D005456:Fluorescent Dyes; D006575:Heterocyclic Compounds, 3-Ring; C532004:IR820-PEI; D011094:Polyethyleneimine; D004247:DNA; D007208:Indocyanine Green