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• W2022980161 abstract "68Ga is a radionuclide of great interest as a positron emitter for positron emission tomography (PET). To develop a new bone-imaging agent with radiogallium, 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) was chosen as a chelating site and Ga-DOTA complex-conjugated bisphosphonate, which has a high affinity for bone, was prepared and evaluated. Although we are interested in developing 68Ga-labeled bone imaging agents for PET, in these initial studies 67Ga was used because of its longer half-life. DOTA-conjugated bisphosphonate (DOTA-Bn-SCN-HBP) was synthesized by conjugation of 2-(4-isothiocyanatebenzyl)-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid to 4-amino-1-hydroxybutylidene-1,1-bisphosphonate (alendronate). 67Ga-DOTA-Bn-SCN-HBP was prepared by coordination with 67Ga, and its in vitro and in vivo evaluations were performed. 67Ga-DOTA-Bn-SCN-HBP was prepared with a radiochemical purity of over 95% without purification. 67Ga-DOTA-Bn-SCN-HBP had great affinity for hydroxyapatite in binding assay. In biodistribution experiments, 67Ga-DOTA-Bn-SCN-HBP accumulated in bone rapidly but was hardly observed in tissues other than bone. Pretreatment of an excess amount of alendronate inhibited the bone accumulation of 67Ga-DOTA-Bn-SCN-HBP. 67Ga-DOTA-Bn-SCN-HBP showed ideal biodistribution characteristics as a bone-imaging agent. These findings should provide useful information on the drug design of bone imaging agents for PET with 68Ga." @default.
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• W2022980161 date "2011-07-01" @default.
• W2022980161 modified "2023-10-04" @default.
• W2022980161 title "Preparation and evaluation of a radiogallium complex-conjugated bisphosphonate as a bone scintigraphy agent" @default.
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• W2022980161 doi "https://doi.org/10.1016/j.nucmedbio.2010.12.004" @default.
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