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- W4237945832 abstract "Microtubule-depolymerizing agents are widely used to synchronize cells, screen for mitotic checkpoint defects, and treat cancer. The present study evaluated the effects of these agents on normal and malignant human breast cell lines. After treatment with 1 μM nocodazole, seven of ten breast cancer lines (type A cells) arrested in mitosis, whereas the other three (type B cells) did not. Similar effects were observed with 100 nM vincristine or colchicine. Among five normal mammary epithelial isolates, four exhibited type A behavior and one exhibited type B behavior. Further experiments revealed that the type B cells exhibited a biphasic dose-response curve, with mitotic arrest at low drug concentrations (100 nM nocodazole or 6 nM vincristine) that failed to depolymerize microtubules and a p53-independent p21waf1/cip1-associated G1 and G2 arrest at higher concentrations (1 μM nocodazole or 100 nM vincristine) that depolymerized microtubules. Collectively, these observations provide evidence for coupling of premitotic cell-cycle progression to microtubule integrity in some breast cancer cell lines (representing a possible “microtubule integrity checkpoint”) and suggest a potential explanation for the recently reported failure of some cancer cell lines to undergo nocodazole-induced mitotic arrest despite intact mitotic checkpoint proteins." @default.
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- W4237945832 date "2002-07-01" @default.
- W4237945832 modified "2023-10-14" @default.
- W4237945832 title "G1 and G2 cell-cycle arrest following microtubule depolymerization in human breast cancer cells" @default.
- W4237945832 doi "https://doi.org/10.1172/jci200213275" @default.
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