title: Tumor targeting and imaging of intraperitoneal tumors by use of antisense oligo-DNA complexed with dendrimers and/or avidin in mice.
abstract: To establish an effective nonviral gene delivery and a corresponding imaging method for i.p.-disseminated tumors, various oligonucleotide-carrier complexes were synthesized, and their in vitro and in vivo properties were examined. The 20-mer multiamino-linked oligonucleotide (oligo), synthesized as antisense against the c-erbB-2 sequence, and the 3'-biotinylated form of the same oligonucleotide (oligo-Bt) were (111)In labeled through a diethylenetriaminepentaacetic acid chelate. (111)In-oligo was mixed with generation 4 polyamidoamine dendrimer (G4) or with biotinylated G4 (G4-Bt), which are positively charged to form electrostatic complexes. (111)In-oligo/G4-Bt and (111)In-oligo-Bt were conjugated to avidin ((111)In-oligo/G4-Av and (111)In-oligo-Av, respectively). (111)In-oligo/G4, (111)In-oligo/G4-Av, (111)In-oligo-Av, and carrier-free (111)In-oligo (2.96 kBq/22.4-45.9 ng of oligo) were examined for internalization in vitro in human ovarian cancer cells (SHIN3). Biodistribution of (111)In-oligo-carrier complexes or (111)In-oligo was examined in normal (n = 4-7) or i.p. SHIN3 tumor-bearing (n = 6-10) mice 2-24 h after i.p. injection (74 kBq/125-300 ng). Scintigraphy of i.p. tumor-bearing and normal mice was performed at various times postinjection of (111)In-oligo-carrier complex or (111)In-oligo (1.85 MBq/2.2 ng). (111)In-oligo-carrier complexes bound to the tumor cells were internalized at a rate of 34-56% at 24 h. In vivo, G4, G4-Av, and Av significantly enhanced tumor delivery of (111)In-oligo [9.1, 14.5, and 24.4% of injected dose per g of tissue (ID/g) at 24 h; P < 0.05, < 0.01, and < 0.0001, respectively] compared with delivery without carrier (0.8% ID/g). Scintigrams of (111)In-oligo delivered to the i.p.-disseminated tumors by the carriers were successfully obtained. In conclusion, G4, G4-Av, and Av can effectively deliver (111)In-oligo to i.p.-disseminated tumors. (111)In-oligo-carrier complexes also have potential as tracers for imaging and monitoring of gene delivery.
authors.affiliation: Department of Nuclear Medicine and Diagnostic Imaging, Kyoto University, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Sato
authors.forename: H
authors.initials: H
authors.lastname: Kobayashi
authors.forename: T
authors.initials: T
authors.lastname: Saga
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamoto
authors.forename: T
authors.initials: T
authors.lastname: Ishimori
authors.forename: K
authors.initials: K
authors.lastname: Togashi
authors.forename: Y
authors.initials: Y
authors.lastname: Fujibayashi
authors.forename: J
authors.initials: J
authors.lastname: Konishi
authors.forename: M W
authors.initials: MW
authors.lastname: Brechbiel
mesh_terms: D000818:Animals; D001360:Avidin / Q000737:chemistry / Q000493:pharmacokinetics; D001692:Biological Transport; D016373:DNA, Antisense / Q000737:chemistry / Q000235:genetics* / Q000493:pharmacokinetics; D004705:Endocytosis; D005260:Female; D018014:Gene Transfer Techniques; D007205:Indium Radioisotopes; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009841:Oligonucleotides / Q000737:chemistry / Q000235:genetics / Q000493:pharmacokinetics; D010534:Peritoneal Neoplasms / Q000235:genetics / Q000473:pathology*; D011877:Radionuclide Imaging / Q000379:methods; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics; D014018:Tissue Distribution; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
chemical_list: D001360:Avidin; D016373:DNA, Antisense; D007205:Indium Radioisotopes; D009841:Oligonucleotides; D018719:Erb-b2 Receptor Tyrosine Kinases