title: Hapten-derivatized nanoparticle targeting and imaging of gene expression by multimodality imaging systems.
abstract: Non-invasive gene monitoring is important for most gene therapy applications to ensure selective gene transfer to specific cells or tissues. We developed a non-invasive imaging system to assess the location and persistence of gene expression by anchoring an anti-dansyl (DNS) single-chain antibody (DNS receptor) on the cell surface to trap DNS-derivatized imaging probes. DNS hapten was covalently attached to cross-linked iron oxide (CLIO) to form a 39+/-0.5 nm DNS-CLIO nanoparticle imaging probe. DNS-CLIO specifically bound to DNS receptors but not to a control single-chain antibody receptor. DNS-CLIO (100 microM Fe) was non-toxic to both B16/DNS (DNS receptor positive) and B16/phOx (control receptor positive) cells. Magnetic resonance (MR) imaging could detect as few as 10% B16/DNS cells in a mixture in vitro. Importantly, DNS-CLIO specifically bound to a B16/DNS tumor, which markedly reduced signal intensity. Similar results were also shown with DNS quantum dots, which specifically targeted CT26/DNS cells but not control CT26/phOx cells both in vitro and in vivo. These results demonstrate that DNS nanoparticles can systemically monitor the expression of DNS receptor in vivo by feasible imaging systems. This targeting strategy may provide a valuable tool to estimate the efficacy and specificity of different gene delivery systems and optimize gene therapy protocols in the clinic.
authors.affiliation: Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors.forename: C-M
authors.initials: CM
authors.lastname: Cheng
authors.forename: P-Y
authors.initials: PY
authors.lastname: Chu
authors.forename: K-H
authors.initials: KH
authors.lastname: Chuang
authors.forename: S R
authors.initials: SR
authors.lastname: Roffler
authors.forename: C-H
authors.initials: CH
authors.lastname: Kao
authors.forename: W-L
authors.initials: WL
authors.lastname: Tseng
authors.forename: J
authors.initials: J
authors.lastname: Shiea
authors.forename: W-D
authors.initials: WD
authors.lastname: Chang
authors.forename: Y-C
authors.initials: YC
authors.lastname: Su
authors.forename: B-M
authors.initials: BM
authors.lastname: Chen
authors.forename: Y-M
authors.initials: YM
authors.lastname: Wang
authors.forename: T-L
authors.initials: TL
authors.lastname: Cheng
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry / Q000494:pharmacology; D045744:Cell Line, Tumor; D003287:Contrast Media / Q000737:chemistry / Q000494:pharmacology*; D003619:Dansyl Compounds / Q000737:chemistry / Q000494:pharmacology*; D005290:Ferric Compounds / Q000737:chemistry / Q000494:pharmacology*; D005456:Fluorescent Dyes / Q000737:chemistry / Q000494:pharmacology*; D015316:Genetic Therapy; D006241:Haptens / Q000737:chemistry / Q000494:pharmacology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D051379:Mice; D008807:Mice, Inbred BALB C; D008856:Microscopy, Fluorescence / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry; D009374:Neoplasms, Experimental / Q000473:pathology* / Q000628:therapy; D012680:Sensitivity and Specificity
chemical_list: D000911:Antibodies, Monoclonal; D003287:Contrast Media; D003619:Dansyl Compounds; D005290:Ferric Compounds; D005456:Fluorescent Dyes; D006241:Haptens; C000499:ferric oxide