title: Uniform mesoporous dye-doped silica nanoparticles decorated with multiple magnetite nanocrystals for simultaneous enhanced magnetic resonance imaging, fluorescence imaging, and drug delivery.
abstract: Highly versatile nanocomposite nanoparticles were synthesized by decorating the surface of mesoporous dye-doped silica nanoparticles with multiple magnetite nanocrystals. The superparamagnetic property of the magnetite nanocrystals enabled the nanoparticles to be used as a contrast agent in magnetic resonance (MR) imaging, and the dye molecule in the silica framework imparted optical imaging modality. Integrating a multitude of magnetite nanocrystals on the silica surface resulted in remarkable enhancement of MR signal due to the synergistic magnetism. An anticancer drug, doxorubicin (DOX), could be loaded in the pores and induced efficient cell death. In vivo passive targeting and accumulation of the nanoparticles at the tumor sites was confirmed by both T2 MR and fluorescence imaging. Furthermore, apoptotic morphology was clearly detected in tumor tissues of mice treated with DOX loaded nanocomposite nanoparticles, demonstrating that DOX was successfully delivered to the tumor sites and its anticancer activity was retained.
authors.affiliation: National Creative Research Initiative Center for Oxide Nanocrystalline Materials, and School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Korea.
authors.forename: Ji Eun
authors.initials: JE
authors.lastname: Lee
authors.forename: Nohyun
authors.initials: N
authors.lastname: Lee
authors.forename: Hyoungsu
authors.initials: H
authors.lastname: Kim
authors.forename: Jaeyun
authors.initials: J
authors.lastname: Kim
authors.forename: Seung Hong
authors.initials: SH
authors.lastname: Choi
authors.forename: Jeong Hyun
authors.initials: JH
authors.lastname: Kim
authors.forename: Taeho
authors.initials: T
authors.lastname: Kim
authors.forename: In Chan
authors.initials: IC
authors.lastname: Song
authors.forename: Seung Pyo
authors.initials: SP
authors.lastname: Park
authors.forename: Woo Kyung
authors.initials: WK
authors.lastname: Moon
authors.forename: Taeghwan
authors.initials: T
authors.lastname: Hyeon
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000494:pharmacology; D016923:Cell Death / Q000187:drug effects; D004317:Doxorubicin / Q000737:chemistry / Q000494:pharmacology; D016503:Drug Delivery Systems; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D008279:Magnetic Resonance Imaging; D008545:Melanoma / Q000188:drug therapy / Q000473:pathology; D051379:Mice; D008819:Mice, Nude; D008856:Microscopy, Fluorescence; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000970:Antineoplastic Agents; D012822:Silicon Dioxide; D004317:Doxorubicin; D052203:Ferrosoferric Oxide