title: [A new radiopharmaceutical for bone imaging: experimental study of 99mTc-HEDTMP].
abstract: The purpose of this study is to prepare 99mTc-HEDTMP [N-(2-hydroxyethyl) ethlenediamine-1,1,2-tri (methylene phosphonic acid), a new kind of bone seeking compound; to investigate its biological properties; and to explore the possibility of using it as a potential radiopharmaceutical for skeleton scintigraphy. HEDTMP was labeled with 99mTc by "pretinning" method, the radiochemical purity was 97.00% +/- 0.34%. 99mTc-HEDTMP was found to be stable in 5 hours in vitro with the radiochemical purity over 95% even after being diluted by physiological saline with the factor of dilution 100. The plane bone scanning of rabbits showed that 99mTc-HEDTMP was principally absorbed by skeletal system. Skull, spine and legs could be observed clearly, and were more legible than the images of 99mTc-MDP. Mice trial also indicated the high bone seeking of 99mTc-HEDTMP. The skeletal uptake was 11.92% ID/g, 13.19% ID/g, 10.14% ID/g, 10.04% ID/g, 7.71% ID/g separately at 30 minutes, 1 hour, 3 hours, 6 hours and 24 hours after the injection. Kidney seemed to be the major excretory organ. The clearance of blood was quick and the retaining amount in non-target organs was small. These results indicate that 99mTc-HEDTMP can be prepared easily, and its biological properties can be compared favorably with the commonly used bone imaging agent, and it is well worth further researching as a promising potential radiopharmaceutical in nuclide diagnosis for skeleton diseases.
authors.affiliation: Department of Nuclear Medicine, Shenzhen Hospital, Peking University, Shenzhen 518036, China.
authors.forename: Shu
authors.initials: S
authors.lastname: Hu
authors.forename: Houfu
authors.initials: H
authors.lastname: Deng
authors.forename: Shubin
authors.initials: S
authors.lastname: Jiang
authors.forename: Shunzhong
authors.initials: S
authors.lastname: Luo
authors.forename: Yong
authors.initials: Y
authors.lastname: Lei
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000000981:diagnostic imaging* / Q000378:metabolism; D005260:Female; D008297:Male; D051379:Mice; D015609:Organotechnetium Compounds / Q000138:chemical synthesis* / Q000493:pharmacokinetics; D011817:Rabbits; D019275:Radiopharmaceuticals / Q000138:chemical synthesis* / Q000493:pharmacokinetics; D011897:Random Allocation; D013669:Technetium Tc 99m Medronate / Q000493:pharmacokinetics; D014018:Tissue Distribution; D015899:Tomography, Emission-Computed, Single-Photon
chemical_list: D015609:Organotechnetium Compounds; D019275:Radiopharmaceuticals; C569365:technetium Tc 99m N-(2-hydroxyethyl) ethlenediamine-1,1,2-tri(methylene phosphonic acid); D013669:Technetium Tc 99m Medronate