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ECTO-NOX target for the anticancer isoflavene phenoxodiol.
D James Morré1, P J Chueh, Kader Yagiz
1Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, USA. morre@pharmacy.purdue.edu
Oncology Research
|May 24, 2007
Summary
Phenoxodiol effectively inhibits cancer cell growth by blocking the cancer-specific ECTO-NOX (tNOX) protein, which is crucial for tumor cell proliferation and survival. This targeted action explains its efficacy in treating various cancers.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Phenoxodiol is a synthetic isoflavene demonstrating clinical efficacy in ovarian and other human cancers.
- Cancer cells exhibit unique cell surface proteins, including ECTO-NOX (tNOX) proteins, involved in growth and oxidative activity.
Purpose of the Study:
- To investigate the mechanism by which phenoxodiol exerts its anti-cancer effects.
- To determine the role of the tNOX protein in phenoxodiol's cytotoxicity.
Main Methods:
- Recombinant tNOX protein binding assays with phenoxodiol.
- Phenoxodiol treatment of mouse fibroblasts expressing a tNOX transgene.
- Measurement of tNOX oxidative and protein disulfide-thiol interchange activities.
- Assessment of phenoxodiol's effect on constitutive ECTO-NOX (CNOX) activity.
Main Results:
- Phenoxodiol binds with high affinity to tNOX (Kd of 50 nM) and inhibits its activity.
- Phenoxodiol induces growth inhibition and apoptosis in tNOX-expressing cells.
- Both oxidative and disulfide-thiol interchange activities of tNOX are responsive to phenoxodiol.
- Constitutive CNOX activity in non-cancer cells remains unaffected by phenoxodiol.
Conclusions:
- The tNOX protein is essential for phenoxodiol's cancer-specific cytotoxicity.
- Phenoxodiol's targeted inhibition of tNOX activity offers a potential therapeutic strategy for cancer treatment.
- The selective action on tNOX explains phenoxodiol's restricted effects on cancer cells.
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