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Two-step immunological approaches for imaging and therapy
1Department of Radiology, University of Rochester, New York, USA.
The Quarterly Journal of Nuclear Medicine : Official Publication of the Italian Association of Nuclear Medicine (AIMN) [And] the International Association of Radiopharmacology (IAR)
|September 1, 1996
Summary
Radiolabeled antibodies improve imaging and therapy but face challenges. New methods using bispecific antibodies or streptavidin systems enhance clearance, reducing background and improving target visibility.
Area of Science:
- Biomedical imaging
- Radiopharmaceutical therapy
- Molecular biology
Background:
- Radiolabeled antibodies (mAbs) and fragments are used in imaging and therapy.
- Prolonged circulation and organ accumulation cause high background and delayed imaging.
- Current multi-step methods involve targeting moieties and radiolabeled agents.
Purpose of the Study:
- To review advanced strategies for improving radiolabeled antibody applications.
- To address challenges of high background and suboptimal imaging times.
- To focus on bispecific mAbs and mAb-streptavidin/biotin systems.
Main Methods:
- Review of bispecific monoclonal antibodies for targeted delivery.
- Examination of the streptavidin (avidin)/biotin system in antibody-based approaches.
- Analysis of strategies for rapid clearance of radiolabeled agents.
Main Results:
- Two- and three-step procedures enhance targeting and reduce background.
- Rapid blood clearance of free radiolabeled agents minimizes radiation dose.
- Improved target-to-background ratios are achieved.
Conclusions:
- Bispecific antibodies offer a promising approach for targeted radioimmunotherapy and imaging.
- The streptavidin/biotin system provides an effective platform for enhanced radiopharmaceutical delivery.
- These advanced methods overcome limitations of traditional radiolabeled antibodies, improving diagnostic and therapeutic outcomes.