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Immunotoxins for targeted cancer therapy
1Laboratory of Molecular Biology, Division of Cancer Biology, National Cancer Institute, National Institutes of Health, 37/4E16, 37 Convent Drive MSC 4255, Bethesda, MD 20892, USA
Advanced Drug Delivery Reviews
|June 6, 2000
Summary
Immunotoxins are novel cancer treatments that use targeted toxins to kill cancer cells. This approach shows promise for various cancers but faces clinical application challenges.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Immunotoxins represent a promising new therapeutic strategy for cancer treatment.
- They function by selectively targeting cancer cells that express specific surface receptors or antigens.
- The therapeutic payload is a cytotoxic protein toxin linked to a targeting ligand.
Purpose of the Study:
- To review the mechanism of action of immunotoxins in cancer therapy.
- To discuss the types of toxins and ligands used in immunotoxin development.
- To highlight the potential applications and challenges of immunotoxins in clinical settings.
Main Methods:
- Review of scientific literature on immunotoxin development and application.
- Analysis of bacterial and plant toxins used in immunotoxin construction.
- Examination of targeting strategies for hematologic malignancies and solid tumors.
Main Results:
- Immunotoxins utilize ligands (growth factors, antibodies) to bind cancer cells, followed by internalization and toxin-mediated cell death.
- Bacterial toxins like Pseudomonas exotoxin and diphtheria toxin are suitable for fusion toxins.
- Plant toxins (ricin, saporin) are often conjugated to ligands via disulfide bonds.
Conclusions:
- Immunotoxins offer a targeted approach to treat both hematologic malignancies and solid tumors.
- Diverse growth factor receptors and antigens can be targeted by immunotoxins.
- Further research is needed to overcome challenges in the clinical application of immunotoxins.