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• W2079897986 abstract "A new antimicrobial quinolone (-)BO-2367, (-)-7-[(1R*, 2R*, 6R*)-2-amino-8-azabicyclo[4.3.0.]-non-3-en-8-yl]-1- cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, strongly inhibited both mammalian and bacterial topoisomerase II. The IC50 values of (-)BO-2367 against the DNA relaxation activity of L1210 topoisomerase II and the supercoiling activities of Escherichia coli gyrase and Micrococcus luteus gyrase were 3.8, 0.5, and 1 microM, respectively. This compound enhanced double-stranded DNA cleavage mediated by topoisomerase II not only with purified enzyme, but also with intact L1210 cells. All these activities of (-)BO-2367 were more than 2-fold stronger than those of VP-16. Intriguingly, (+)BO-2367, which has an enantiomeric substituent at the C7 position of (-)BO-2367, did not affect the activity of the mammalian topoisomerase II, while it inhibited E. coli gyrase. Intraperitoneal injection of (-)BO-2367 at 0.08 mg/kg increased the lifespan of CDF1 female mice bearing ascitic L1210 leukemia by 2.4 times, and subcutaneous injection at 1.25 mg/kg completely inhibited the growth of colon 26 carcinoma implanted subcutaneously. These results suggest that (-)BO-2367 is a potent antitumor agent which targets topoisomerase II. These enantiomers should be a useful tool for studying drug-topoisomerase II interactions." @default.
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• W2079897986 date "1993-07-01" @default.
• W2079897986 modified "2023-09-30" @default.
• W2079897986 title "Stereo(C7)-dependent Topoisomerase II Inhibition and Tumor Growth Suppression by a New Quinolone, BO-2367" @default.
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• W2079897986 doi "https://doi.org/10.1111/j.1349-7006.1993.tb02047.x" @default.
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