Thiol-containing peptides can be radiolabeled with fluorine-18 (F-18) by reacting a peptide comprising a free thiol group with an F-18-bound labelling reagent which also has a group that is reactive with thiols. The resulting F-18-labeled peptides may be targeted to a tissue of interest using bispecific antibodies or bispecific antibody fragments having one arm specific for the F-18-labeled peptide or a low molecular weight hapten conjugated to the F-18-labeled peptide, and another arm specific to the targeted tissue. The targeted tissue is subsequently visualized by clinical positron emission tomography.
含
硫醇的肽可以用
氟-18(F-18)进行放射性标记,方法是将含有游离
硫醇基团的肽与同样具有与
硫醇反应的基团的 F-18 结合型标记试剂反应。由此产生的 F-18 标记肽可使用双特异性
抗体或双特异性
抗体片段靶向感兴趣的组织,双特异性
抗体或双特异性
抗体片段的一个臂特异于 F-18 标记肽或与 F-18 标记肽结合的低分子量合体,另一个臂特异于靶组织。靶组织随后可通过临床正电子发射断层扫描显像。