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Developments with targeted enzymes in cancer therapy
K D Bagshawe1, S K Sharma, P J Burke
1Department of Medical Oncology, Imperial College of Medicine, Charing Cross campus London, W6 8RP, UK. k.bagshawe@cxwms.ac.uk
Current Opinion in Immunology
|October 6, 1999
Summary
Polymer-drug conjugates enhance cancer therapy by delivering enzymes to tumors, activating prodrugs into cytotoxic agents. This approach reduces immunogenicity and allows targeted cancer treatment with improved efficacy.
Area of Science:
- Oncology
- Biotechnology
- Drug Delivery
Background:
- Enzyme-directed cancer therapy has evolved significantly.
- Antibody-directed enzyme/prodrug therapy is a key area of advancement.
- Polymer-based enzyme delivery offers new therapeutic strategies.
Purpose of the Study:
- To explore the use of polymers for enzyme delivery to solid tumors.
- To investigate the potential of polymer-enzyme conjugates in cancer treatment.
- To evaluate methods for targeted activation of prodrugs within tumors.
Main Methods:
- Utilizing methoxypolyethylene glycol (MPEG) to create enzyme conjugates.
- Employing polymer-enzyme conjugates for targeted prodrug activation.
- Investigating the use of enzyme-activated rescue agents for selective tumor targeting.
Main Results:
- MPEG-enzyme conjugates demonstrate reduced immunogenicity, enabling repeat treatments.
- Polymer-delivered enzymes can convert prodrugs (e.g., CB1954) into potent cytotoxic agents.
- Tumor-specific enzyme activity can enable prolonged antimetabolite action by degrading rescue agents.
Conclusions:
- Polymer-based enzyme delivery systems represent a promising strategy for cancer therapy.
- This approach allows for targeted activation of prodrugs and enhanced therapeutic efficacy.
- Further development of enzyme delivery systems can improve cancer treatment outcomes.
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