Iodine-131 and indium-111 labelled avidin and streptavidin for pre-targetted immunoscintigraphy with biotinylated anti-tumour monoclonal antibody

Nucl Med Commun. 1988 Nov;9(11):931-41. doi: 10.1097/00006231-198811000-00010.

Abstract

Studies have been carried out in mice to examine by gamma camera imaging and dissection analysis the biodistribution of 131I- and 111In-labelled avidin and streptavidin. This has included mice with human tumour xenografts pre-targetted with biotinylated anti-tumour monoclonal antibody. Both iodine-labelled avidin and streptavidin were cleared rapidly from the circulation particularly to kidneys, which showed prolonged retention of the tracer. Similar distribution was seen with 111In-labelled preparations, although here tracer also accumulated in the liver. Radiolabelled preparations could form complexes in vitro with a biotinylated monoclonal antibody. This biotinylated antibody, following radioiodine labelling, localized in xenografts of a human osteosarcoma. When xenografted mice were injected with biotinylated antibody followed by 111In-labelled avidin, levels of tracer per gram of tumour tissue were four times higher than those in non-pretreated mice. However, there was still marked liver and kidney uptake of tracer and, since this dominated the images, tumours were not visualized by scintigraphy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies, Monoclonal*
  • Avidin*
  • Bacterial Proteins*
  • Biotin
  • Indium Radioisotopes*
  • Iodine Radioisotopes*
  • Mice
  • Neoplasms / diagnostic imaging*
  • Radionuclide Imaging
  • Streptavidin

Substances

  • Antibodies, Monoclonal
  • Bacterial Proteins
  • Indium Radioisotopes
  • Iodine Radioisotopes
  • Avidin
  • Biotin
  • Streptavidin