A method is provided for preparing a radiolabeled conjugate, which comprises the steps of:
(a) contacting an active ester derivative or a thiol-reactive derivative of the bis-thiosemicarbazone of a 1,2-, 1,3- or 1,4-dicarbonyl compound with a radioisotope solution of reduced pertechnetate or perrhenate or of copper, mercury or lead/bismuth ions, to form a radiolabeled bis-thiosemicarbazone chelate without substantially affecting the active ester or the thiol-reactive function; and
(b) reacting the radiolabeled bis-thiosemicarbazone chelate with (i) an amine in the case of an active ester derivative, or (ii) a thiol in the case of a thiol-reactive derivative, to form a radiolabeled conjugate.
Also provided are chelators for radioisotopes, radiolabeling agents for labeling an amine or a thiol, kits and injectable preparations for use therewith, and improved imaging methods for in vivo human use employing the foregoing compositions and methods.
提供了一种制备放射性标记共轭物的方法,该方法包括以下步骤
(a) 将 1,2-、1,3- 或 1,4- 二羰基化合物的双
硫代
氨基羰基的活性酯衍
生物或巯基反应衍
生物与还原过
硫酸盐或过
铼酸盐或
铜、
汞或
铅/
铋离子的放射性同位素溶液接触,形成放射性标记的双
硫代
氨基羰基螯合物,而不对活性酯或巯基反应功能产生实质性影响;以及
(b) 使放射性标记的双
硫代
氨基
脲螯合物与(i)胺(如为活性酯衍
生物)或(ii)
硫醇 (如为
硫醇反应衍
生物)反应,形成放射性标记的共轭物。
此外,还提供了放射性同位素
螯合剂、标记胺或
硫醇的放射性标记剂、与之配套使用的试剂盒和注射制剂,以及采用上述组合物和方法的人体体内使用的改进成像方法。