title: Tumor growth suppression by gadolinium-neutron capture therapy using gadolinium-entrapped liposome as gadolinium delivery agent.
abstract: Neutron capture therapy (NCT) is a promising non-invasive cancer therapy approach and some recent NCT research has focused on using compounds containing gadolinium as an alternative to currently used boron-10 considering several advantages that gadolinium offers compared to those of boron. In this study, we evaluated gadolinium-entrapped liposome compound as neutron capture therapy agent by in vivo experiment on colon-26 tumor-bearing mice. Gadolinium compound were injected intravenously via tail vein and allowed to accumulate into tumor site. Tumor samples were taken for quantitative analysis by ICP-MS at 2, 12, and 24 h after gadolinium compound injection. Highest gadolinium concentration was observed at about 2 h after gadolinium compound injection with an average of 40.3 μg/g of wet tumor tissue. We performed neutron irradiation at JRR-4 reactor facility of Japan Atomic Energy Research Institute in Tokaimura with average neutron fluence of 2×10¹² n/cm². The experimental results showed that the tumor growth suppression of gadolinium-injected irradiated group was revealed until about four times higher compared to the control group, and no significant weight loss were observed after treatment suggesting low systemic toxicity of this compound. The gadolinium-entrapped liposome will become one of the candidates for Gd delivery system on NCT.
authors.affiliation: Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Tokyo, 113-8656 Tokyo, Japan.
authors.forename: Novriana
authors.initials: N
authors.lastname: Dewi
authors.forename: Hironobu
authors.initials: H
authors.lastname: Yanagie
authors.forename: Haito
authors.initials: H
authors.lastname: Zhu
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Demachi
authors.forename: Atsuko
authors.initials: A
authors.lastname: Shinohara
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Yokoyama
authors.forename: Masaki
authors.initials: M
authors.lastname: Sekino
authors.forename: Yuriko
authors.initials: Y
authors.lastname: Sakurai
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Morishita
authors.forename: Naoko
authors.initials: N
authors.lastname: Iyomoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nagasaki
authors.forename: Yukichi
authors.initials: Y
authors.lastname: Horiguchi
authors.forename: Yukio
authors.initials: Y
authors.lastname: Nagasaki
authors.forename: Jun
authors.initials: J
authors.lastname: Nakajima
authors.forename: Minoru
authors.initials: M
authors.lastname: Ono
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Kakimi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Takahashi
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001895:Boron / Q000494:pharmacology; D016503:Drug Delivery Systems / Q000379:methods; D005682:Gadolinium / Q000494:pharmacology*; D007564:Japan; D008081:Liposomes / Q000008:administration & dosage*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009369:Neoplasms / Q000188:drug therapy*; D017247:Neutron Capture Therapy / Q000379:methods*
chemical_list: D000970:Antineoplastic Agents; D008081:Liposomes; D005682:Gadolinium; D001895:Boron
keywords: Drug delivery system; Gadolinium; Liposome; Neutron capture therapy