Author:
Morr D. James,Korty Theodore,Meadows Christiaan,Ades Laura M. C.,Morr Dorothy M.
Abstract
ME-143 (NV-143), a synthetic isoflavone under clinical evaluation for efficacy in the management of ovarian and other forms of human cancer, blocked the activity of a cancer-specific and growth-related cell surface ECTO-NOX protein with both oxidative (hydroquinone) and protein disulfide-thiol
interchange activity designated ENOX2 (tNOX) and inhibited the growth of cultured cancer cells with EC50s in the range of 2050 nM. Purified recombinant ENOX2 also bound ME-143 with a K d of 43 (4050) nM. Both the oxidative and protein disulfide-thiol interchange
activities of ENOX proteins that alternate to generate a complex set of oscillations with a period length of 22 min compared to 24 min for the constitutive counterpart ENOX1 (CNOX) that characterizes ENOX proteins responded to ME-143. Oxidation of NADH or reduced coenzyme Q10 was
rapidly blocked. In contrast, the protein disulfide-thiol interchange activity measured from the cleavage of dithiodipyridine (EC50 of ca. 50 nM) was inhibited progressively over an interval of 60 min that spanned three cycles of activity. Inhibition of the latter paralleled the
inhibition of cell enlargement and the consequent inability of inhibited cells to initiate traverse of the cell cycle. Activities of constitutive ENOX1 (CNOX) forms of either cancer or noncancer cells were unaffected by ME-143 over the range of concentrations inhibiting ENOX2. Taken together,
the findings show that ME-143 binds to ENOX2 with an affinity 4 to 10 times greater than that reported previously for the related anticancer isoflavone, phenoxodiol.
Subject
Cancer Research,Oncology,General Medicine
Reference50 articles.
1. Phenoxodiol, a novel isoflavone, induces G1 arrest by specific loss in cyclin-dependent kinase 2 activity by p53-independent induction of p21WAF1/CIP1;Cancer Res.,2005
2. Flavanoid compounds in maintenance of prostate health and prevention and treatment of cancer;Mol. Biotechnol.,2005
3. Phenoxodiol an isoflavone analog induces apoptosis in chemoresistant ovarian cancer cells;Oncogene,2003
4. Phenoxodiol (2H-1-benzopyran-7-0,1,3-(4-hydroxyphenyl)), a novel isoflavone derivative, inhibits DNA topoisomerase II by stabilizing the cleavable complex;Anticancer Res.,2002
5. Phenoxodiol, a novel isoflavone derivative, inhibits dimethylbenz[1]anthracene (DMBA)-induced mammary carcinogenesis in female Sprague-Dawley rats;Eur. J. Cancer,2003
Cited by
7 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献