title: Increased heating efficiency and selective thermal ablation of malignant tissue with DNA-encased multiwalled carbon nanotubes.
abstract: Nanoparticles, including multiwalled carbon nanotubes (MWNTs), strongly absorb near-infrared (nIR) radiation and efficiently convert absorbed energy to released heat which can be used for localized hyperthermia applications. We demonstrate for the first time that DNA-encasement increases heat emission following nIR irradiation of MWNTs, and DNA-encased MWNTs can be used to safely eradicate a tumor mass in vivo. Upon irradiation of DNA-encased MWNTs, heat is generated with a linear dependence on irradiation time and laser power. DNA-encasement resulted in a 3-fold reduction in the concentration of MWNTs required to impart a 10 degrees C temperature increase in bulk solution temperature. A single treatment consisting of intratumoral injection of MWNTs (100 microL of a 500 microg/mL solution) followed by laser irradiation at 1064 nm, 2.5 W/cm(2) completely eradicated PC3 xenograft tumors in 8/8 (100%) of nude mice. Tumors that received only MWNT injection or laser irradiation showed growth rates indistinguishable from nontreated control tumors. Nonmalignant tissues displayed no long-term damage from treatment. The results demonstrate that DNA-encased MWNTs are more efficient at converting nIR irradiation into heat compared to nonencased MWNTs and that DNA-encased MWNTs can be used safely and effectively for the selective thermal ablation of malignant tissue in vivo.
authors: Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
authors: Supratim
authors: S
authors: Ghosh
authors: Samrat
authors: S
authors: Dutta
authors: Evan
authors: E
authors: Gomes
authors: David
authors: D
authors: Carroll
authors: Ralph
authors: R
authors: D'Agostino
authors: John
authors: J
authors: Olson
authors: Martin
authors: M
authors: Guthold
authors: William H
authors: WH
authors: Gmeiner
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D002471:Cell Transformation, Neoplastic; D004247:DNA / Q000737:chemistry*; D005240:Feasibility Studies; D006358:Hot Temperature; D053685:Laser Therapy; D008297:Male; D051379:Mice; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009369:Neoplasms / Q000473:pathology* / Q000601:surgery*; D012995:Solubility; D014867:Water / Q000737:chemistry
chemical_list: D037742:Nanotubes, Carbon; D014867:Water; D004247:DNA