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result sql = Cyclodextrin-derived diorganyl tellurides as glutathione peroxidase mimics and inhibitors of thioredoxin reductase and cancer cell growth.
Cyclodextrin-derived diorganyl tellurides as glutathione peroxidase mimics and inhibitors of thioredoxin reductase and cancer cell growth.
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result sql = Water-soluble diorganyl tellurides of the alkyl aryl or dialkyl type were prepared by treatment of mono-6-tosyl-beta-cyclodextrin with sodium alkanetellurolates or arenetellurolates or sodium telluride. The novel cyclodextrin-derived organotelluriums were evaluated for their capacity to catalyze the reduction of hydrogen peroxide, tert-butyl hydroperoxide, and cumene hydroperoxide in the presence of glutathione, NADPH, and GSSG-reductase (coupled reductase assay). Cyclodextrins 4d and 4e, carrying 4-(N,N-dimethylamino)phenyltelluro and n-butyltelluro groups, respectively, were the most efficient glutathione peroxidase mimics. Reduction of lipophilic cumene hydroperoxide often proceeded 10-20 times faster than reduction of the more hydrophilic hydroperoxides, which cannot bind into the hydrophobic interior of the cyclodextrin. Thus, it seems that the carbohydrate moiety acts as a binding site for the hydroperoxide substrate. The cyclodextrin derivatives were also evaluated for their capacity to inhibit thioredoxin reductase/thioredoxin and cancer cell growth in culture. IC(50) values for inhibition of thioredoxin or thioredoxin/thioredoxin reductase were in the submicromolar range for the best inhibitors (compounds 4d and 5). Two of the compounds (4c and 5) were found to inhibit the growth of MCF-7 cells in culture with IC(50) values in the low micromolar range.

Publication: J. Med. Chem. 2004 Jan 1 ;47(1)::233-9.
Publication Date: 2004 Jan 1
Study Author(s): McNaughton, Michael;Engman, Lars;Birmingham, Anne;Powis, Garth;Cotgreave, Ian A;
Institution: Department of Organic Chemistry, Institute of Chemistry, Uppsala University, Box 599, S-751 24 Uppsala, Sweden.
Shortcut link to this study:
Water-soluble diorganyl tellurides of the alkyl aryl or dialkyl type were prepared by treatment of mono-6-tosyl-beta-cyclodextrin with sodium alkanetellurolates or arenetellurolates or sodium telluride. The novel cyclodextrin-derived organotelluriums were evaluated for their capacity to catalyze the reduction of hydrogen peroxide, tert-butyl hydroperoxide, and cumene hydroperoxide in the presence of glutathione, NADPH, and GSSG-reductase (coupled reductase assay). Cyclodextrins 4d and 4e, carrying 4-(N,N-dimethylamino)phenyltelluro and n-butyltelluro groups, respectively, were the most efficient glutathione peroxidase mimics. Reduction of lipophilic cumene hydroperoxide often proceeded 10-20 times faster than reduction of the more hydrophilic hydroperoxides, which cannot bind into the hydrophobic interior of the cyclodextrin. Thus, it seems that the carbohydrate moiety acts as a binding site for the hydroperoxide substrate. The cyclodextrin derivatives were also evaluated for their capacity to inhibit thioredoxin reductase/thioredoxin and cancer cell growth in culture. IC(50) values for inhibition of thioredoxin or thioredoxin/thioredoxin reductase were in the submicromolar range for the best inhibitors (compounds 4d and 5). Two of the compounds (4c and 5) were found to inhibit the growth of MCF-7 cells in culture with IC(50) values in the low micromolar range.
PMID: 14695837

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