title: Exceptionally high payload of doxorubicin in hollow gold nanospheres for near-infrared light-triggered drug release.
abstract: We report dual-functional hollow gold nanospheres (HAuNS, approximately 40-nm diameter) capable of mediating both photothermal ablation of cancer cells and drug release upon near-infrared (NIR) light irradiation. As high as 63% DOX by weight ( approximately 1.7 microg DOX/microg Au) could be loaded to polyethylene glycol (PEG)-coated HAuNS since DOX was coated to both the outer and the inner surfaces of HAuNS. Irradiation with NIR laser induced photothermal conversion, which triggered rapid DOX release from DOX-loaded HAuNS. The release of DOX was also pH-dependent, with more DOX released in aqueous solution at lower pH. Significantly greater cell killing was observed when MDA-MB-231 cells incubated with DOX-loaded HAuNS were irradiated with NIR light, attributable to both HAuNS-mediated photothermal ablation and cytotoxicity of released free DOX.
authors.affiliation: Department of Experimental Diagnostic Imaging, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Jian
authors.initials: J
authors.lastname: You
authors.forename: Guodong
authors.initials: G
authors.lastname: Zhang
authors.forename: Chun
authors.initials: C
authors.lastname: Li
mesh_terms: D000327:Adsorption; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000378:metabolism* / Q000494:pharmacology; D001692:Biological Transport; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004317:Doxorubicin / Q000737:chemistry* / Q000378:metabolism* / Q000494:pharmacology; D004337:Drug Carriers / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006801:Humans; D007259:Infrared Rays; D054118:Nanospheres / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry
chemical_list: D000970:Antineoplastic Agents; D004337:Drug Carriers; D011092:Polyethylene Glycols; D006046:Gold; D004317:Doxorubicin