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Bioactivation of quinones by DT-diaphorase, molecular, biochemical, and chemical studies

Ross, D., Beall, H.D., Traver, R.D., Siegel, D., Phillips, Roger M. and Gibson, N.W. (1994) Bioactivation of quinones by DT-diaphorase, molecular, biochemical, and chemical studies. Oncology Research, 6 (10-11). pp. 493-500.

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Abstract

Because of the elevated DT-diaphorase (DTD) activity in certain tumors such as human nonsmall cell lung cancer (NCSLC), DTD is a potential target on which to base the development of new antitumor compounds. Mitomycin C is the most effective single agent used for the therapy of NSCLC and is metabolized and bioactivated by DTD. Mitomycin C is a poor substrate for DTD, however, and its metabolism is pH-dependent. We have therefore focused on identifying more efficient substrates for DTD. We have developed a metabolic and cytotoxicity screen that identifies compounds which are efficiently bioactivated by DTD. This screen utilizes both aerobic and hypoxic conditions and cell lines with both elevated and deficient DTD activity as an index of selectivity. Using the screen described above, we have identified [3-hydroxy-5-aziridinyl-1-methyl-2-(1H-indole-4,7-indione)-prop-be ta-en- alpha-ol] (E09), 2,5-diaziridinyl-1,4-benzoquinone (MeDZQ), and streptonigrin as compounds that are most efficiently bioactivated by DTD and exert selective cytotoxicity. Although certain tumors such as NSCLC have elevated DTD activity, we have characterized a point mutation at position 609 in the DTD cDNA, which codes for a proline to serine change in the protein and leads to a loss of enzyme activity. We have characterized this mutation in both BE human colon carcinoma cells and H596 human NSCLC cells. This mutation and resulting lack of DTD activity complicates the use of agents designed to target DTD in tumors.

Item Type: Article
Subjects: R Medicine > RM Therapeutics. Pharmacology
Schools: School of Applied Sciences
Related URLs:
Depositing User: Roger Phillips
Date Deposited: 13 May 2015 09:56
Last Modified: 13 May 2015 09:56
URI: http://eprints.hud.ac.uk/id/eprint/24520

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