title: Effect of edetate calcium disodium on yttrium-90 activity in bone of mice.
abstract: The kinetics of Yttrium-90 (Y-90) in bone of mice was investigated in combination with edetate calcium disodium (CaNa2EDTA). One group of mice were intraperitoneally administered 37.5 mg/kg CaNa2EDTA or 0.9% NaCl as a control at 1, 22, 34, 46, 58, 70, 82, 94, 154 and 166 h after injection of Y-90 acetate (post-administration), and the biodistribution was studied at 3, 24, 72, 120 and 168 h postinjection of Y-90 acetate. No difference between the post-CaNa2EDTA-treated mice and the control was demonstrated in the radioactivity in the bone. A decrease in radioactivity in the liver and kidneys was accelerated, and the radioactivity was lower than the control at 120 h postinjection. The other group of mice were also given the same dose of chelator at 12 h and 1 h preinjection of Y-90 acetate and at 1, 22, 34, 46, 58, 70, 82, 94, 154 and 166 h after injection of Y-90 acetate (pre- and post-administration), the radioactivity in bone at 3 h postinjection was significantly lower than in the control (24.4 +/- 3.92% ID/g vs. 31.7 +/- 2.26% ID/g, p < 0.05), but the decrease was not sequential. A significant reduction in radioactivity in the blood, kidneys and liver was demonstrated at 3 h, 72 h and 72 h postinjection. In conclusion, the CaNa2EDTA with the administration schedule employed here cannot chelate the Y-90 from bone but the free Y-90 before deposition into bone.
authors.affiliation: Division of Advanced Technology for Medical Imaging, National Institute of Radiological Sciences and Gunma University School of Medicine, Japan. w_nao@nirs.go.jp
authors.forename: N
authors.initials: N
authors.lastname: Watanabe
authors.forename: N
authors.initials: N
authors.lastname: Oriuchi
authors.forename: S
authors.initials: S
authors.lastname: Tanada
authors.forename: H
authors.initials: H
authors.lastname: Murata
authors.forename: T
authors.initials: T
authors.lastname: Inoue
authors.forename: E E
authors.initials: EE
authors.lastname: Kim
authors.forename: Y
authors.initials: Y
authors.lastname: Sasaki
authors.forename: K
authors.initials: K
authors.lastname: Endo
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000000981:diagnostic imaging / Q000378:metabolism; D004492:Edetic Acid / Q000494:pharmacology*; D005260:Female; D007668:Kidney / Q000000981:diagnostic imaging / Q000378:metabolism; D008099:Liver / Q000000981:diagnostic imaging / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D011877:Radionuclide Imaging; D014018:Tissue Distribution / Q000187:drug effects; D015021:Yttrium Radioisotopes / Q000493:pharmacokinetics*
chemical_list: D015021:Yttrium Radioisotopes; D004492:Edetic Acid