title: Magnetic resonance imaging of multifunctional pluronic stabilized iron-oxide nanoparticles in tumor-bearing mice.
abstract: We are investigating the magnetic resonance imaging characteristics of magnetic nanoparticles (MNPs) that consist of an iron-oxide magnetic core coated with oleic acid (OA), then stabilized with a pluronic or tetronic block copolymer. Since pluronics and tetronics vary structurally, and also in the ratio of hydrophobic (poly[propylene oxide]) and hydrophilic (poly[ethylene oxide]) segments in the polymer chain and in molecular weight, it was hypothesized that their anchoring to the OA coating around the magnetic core could significantly influence the physical properties of MNPs, their interactions with biological environment following intravenous administration, and ability to localize to tumors. The amount of block copolymer associated with MNPs was seen to depend upon their molecular structures and influence the characteristics of MNPs. Pluronic F127-modified MNPs demonstrated sustained and enhanced contrast in the whole tumor, whereas that of Feridex IV was transient and confined to the tumor periphery. In conclusion, our pluronic F127-coated MNPs, which can also be loaded with anticancer agents for drug delivery, can be developed as an effective cancer theranostic agent, i.e. an agent with combined drug delivery and imaging properties.
authors.affiliation: Department of Biomedical Engineering/ND20, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue Cleveland, OH 44195, USA.
authors.forename: Tapan K
authors.initials: TK
authors.lastname: Jain
authors.forename: Susan P
authors.initials: SP
authors.lastname: Foy
authors.forename: Bernadette
authors.initials: B
authors.lastname: Erokwu
authors.forename: Sanja
authors.initials: S
authors.lastname: Dimitrijevic
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Flask
authors.forename: Vinod
authors.initials: V
authors.lastname: Labhasetwar
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000473:pathology; D045744:Cell Line, Tumor; D005260:Female; D005290:Ferric Compounds / Q000737:chemistry*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D051379:Mice; D008819:Mice, Nude; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009369:Neoplasms / Q000188:drug therapy*; D010316:Particle Size; D020442:Poloxamer / Q000627:therapeutic use*; D014183:Transplantation, Heterologous; D047368:Tumor Burden; D023041:Xenograft Model Antitumor Assays / Q000379:methods
chemical_list: D005290:Ferric Compounds; D020442:Poloxamer; C000499:ferric oxide