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• W2164573427 abstract "Biochemical studies suggest that caspase activity is required for a functional mitotic checkpoint (MC) and mitotic slippage. To test this directly, we followed nontransformed human telomerase immortalized human retinal pigment epithelia (RPE-1) cells through mitosis after inhibiting or depleting selected caspases. We found that inhibiting caspases individually, in combination, or in toto did not affect the duration or fidelity of mitosis in otherwise untreated cells. When satisfaction of the MC was prevented with 500 nM nocodazole or 2.5 μM dimethylenastron (an Eg5 inhibitor), 92–100% of RPE-1 cells slipped from mitosis in the presence of pan-caspase inhibitors or after simultaneously depleting caspase-3 and -9, and they did so with the same kinetics (∼21–22 h) as after treatment with nocodazole or Eg5 inhibitors alone. Surprisingly, inhibiting or depleting caspase-9 alone doubled the number of nocodazole-treated, but not Eg5-inhibited, cells that died in mitosis. In addition, inhibiting or depleting caspase-9 and -3 together accelerated the rate of slippage ∼40% (to ∼13–15 h). Finally, nocodazole-treated cells that recently slipped through mitosis in the presence or absence of pan-caspase inhibitors contained numerous BubR1 foci in their nuclei. From these data, we conclude that caspase activity is not required for a functional MC or for mitotic slippage." @default.
• W2164573427 created "2016-06-24" @default.
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• W2164573427 date "2011-07-15" @default.
• W2164573427 modified "2023-10-02" @default.
• W2164573427 title "Caspase activity is not required for the mitotic checkpoint or mitotic slippage in human cells" @default.
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• W2164573427 doi "https://doi.org/10.1091/mbc.e11-03-0228" @default.
• W2164573427 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3135473" @default.
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