title: Galactose-modified streptavidin-GC4 antifibrin monoclonal antibody conjugates: application for two-step thrombus/embolus imaging.
abstract: Diagnostic and therapeutic procedures utilizing the high affinity streptavidin (SA)/biotin system are being investigated for in vivo use. We are developing a rapid two-step imaging technique for the diagnosis of deep venous thrombosis and pulmonary embolism. The optimal SA-bound targeting moiety would circulate adequately for sufficient lesion accumulation, but nonbound reagent would clear in a reasonably short time before the injection of radiolabeled biotin. The objective of this study was to cross-link SA and galactose-modified SA to GC4 antifibrin monoclonal antibody and to study the pharmacokinetics and biodistribution of the radiolabeled GC4-SA conjugates after injection into rabbits. A cross-linking method was developed for the synthesis of the GC4-SA conjugates via the addition reaction of sulfhydryl containing SA derivatives with maleimide-GC4. In vivo, radiolabeled trigalactose modified SA-GC4 exhibited a much faster blood clearance compared to mono-galactose modified GC4-SA or GC4-SA containing no galactose.
authors.affiliation: Department of Radiology, University of Rochester Medical Center, New York, USA.
authors.forename: S F
authors.initials: SF
authors.lastname: Rosebrough
authors.forename: M
authors.initials: M
authors.lastname: Hashmi
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D001426:Bacterial Proteins; D005337:Fibrin / Q000276:immunology*; D005690:Galactose; D007457:Iodine Radioisotopes; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging*; D011817:Rabbits; D016719:Radioimmunodetection; D019809:Streptavidin; D013924:Thrombophlebitis / Q000000981:diagnostic imaging*
chemical_list: D000911:Antibodies, Monoclonal; D001426:Bacterial Proteins; D007457:Iodine Radioisotopes; D005337:Fibrin; D019809:Streptavidin; D005690:Galactose